CN102017545A - Relay device and communication control device - Google Patents

Relay device and communication control device Download PDF

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Publication number
CN102017545A
CN102017545A CN2009801139837A CN200980113983A CN102017545A CN 102017545 A CN102017545 A CN 102017545A CN 2009801139837 A CN2009801139837 A CN 2009801139837A CN 200980113983 A CN200980113983 A CN 200980113983A CN 102017545 A CN102017545 A CN 102017545A
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China
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mentioned
packet
address
domain name
data
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中岛健
山田雄介
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Sharp Corp
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Sharp Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2854—Wide area networks, e.g. public data networks
    • H04L12/2856—Access arrangements, e.g. Internet access
    • H04L12/2869—Operational details of access network equipments
    • H04L12/2898—Subscriber equipments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2458—Modification of priorities while in transit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/45—Network directories; Name-to-address mapping
    • H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
    • H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]

Abstract

Provided is an HGW (101) including: a QoS object storage unit (22) which stores at least a domain name of a domain to which a data transmission device for transmitting a packet as a QoS object belongs; a priority data generation processing unit (13) which acquires a domain name/address solution packet for solving the address of the data transmission device and stores an address group formed by addresses contained in the acquired domain name/address solution packet in a packet priority storage unit (23) if the domain name contained in the acquired domain name/address solution packet coincides with the domain name stored in the QoS object storage unit (22); and a packet priority modification process unit (14) which is used when the address group formed by addresses contained in a packet to be relayed by the local device is stored in the packet priority storage unit (23), for transferring the packet to be relayed with a higher priority.

Description

Relay and communication control unit
Technical field
The present invention relates on a kind of communication network that can transmit a plurality of data flow at the same time above-mentioned data flow be carried out QoS (Quality of Service: service quality) Kong Zhi relay and communication control unit.
Background technology
Set-top box) etc. next generation network) in recent years, having occurred can be by IP (Internet Protocal: net or NGN (Next Generation Network: the television set or STB (the Set Top Box: receive the service of looking contents such as audio frequency or audio frequency by content providing devices such as content server provided on the receiving system of Access Network in user family such as Internet protocol).Wherein, generally by data packet communication, that is, the transmitting-receiving by packet transmits data, carries out data transmit-receive between each device with this.At this, data are created as the frame of prescribed form after, packet is used on this frame the additional various information such as address that send the destination.
When being sent in the user family from the data of Access Network, home gateway) etc. temporarily (Home Gateway: router receives, and is situated between thereafter by the LAN that sets up in the user family (Local Area Network: local area network (LAN)) be sent to receiving systems such as television set or STB by HGW.In recent years, as the LAN that is based upon in the user family, no longer needed by the LAN that cable connected and composed as communication media, what replace not only increase is that the user is to PLC (Power Line Communication: the power line communication) demand of network in the past.PLC a kind ofly transmits the technology of data by power line, can communicate between common socket.If use Ethernet (Ethernet (registered trade mark); Recording and narrating to place an order is Ethernet) network bridge device between PLC and the Ethernet (PLC adapter) is connected to router and receiving system, even so router and receiving system be provided with the place mutually away from, router and receiving system also can be situated between and be communicated by the PLC adapter, and interior network therefore can found a family under the condition that new cable is not set.Therefore, by the LAN that cable constituted as communication media, its advantage was that new cable need not be set just can set up network than in the past.In addition, when will mobile receiving system,, where can both connect network, therefore also have the advantage of high one-movement-freedom-degree so long as be provided with the place of supply socket.
(QoS technology)
Carry out web content reading, mail transmission/reception, based on FTP (File Transfer Protocal: when data transmission file transfer protocol (FTP)) waits these non-real-time datas to transmit, even to a certain degree propagation delay or shake (vibration that causes because of propagation delay) occur, also there is no big influence for the data playback in the receiving system.But when transmitting as real time datas such as video or audio frequency, propagation delay or shake can cause resetting in the receiving system looks audio frequency or audio frequency gets muddled, so must be with propagation delay or jitter suppression in preset range.Promptly, in order to make the receiving system can be high-speed, high-qualityly from the content providing device received content, especially these require to keep real-time or successional flow data to look audio frequency or audio frequency etc., must guarantee the transmission quality with the corresponding packet of content in each network rightly.
So, guarantee appropriate quality, and can be called QoS (Quality of Service: service quality) technology the technology that a plurality of data efficiently transmit simultaneously according to the data class that is transmitted.The QoS technology is broadly divided into preferential control type QoS (Prioritized QoS) and parameter guarantee type QoS (Parameterized QoS).
(preferential control type QoS)
In preferential control type QoS, pay corresponding priority such as characteristic with the communicator of data class and transceive data to the packet of the data that sent by the communicator that sends data.According to packet the priority of being paid to control to sending data, thereby can realize QoS.At this, as the method for paying priority to packet, general adopt head at packet to set in advance to be used for the field that the memory priority level represents to be worth (below, be referred to as precedence field), and set the method for the value of precedence field for each packet.
For example, than non-real-time data, real time data is required higher transmission quality, therefore, on the priority of data packets field of real time data, generally all sets the priority value higher than the packet of non-real-time data.Decide the transmission opportunity of packet by the relay on dispensing device or the communication network according to the value of each priority of data packets field, thereby can realize QoS.
(parameter guarantee type QoS)
In parameter guarantee type QoS, be provided for the main frame of supervisory communications network bandwidth on the whole.The qos parameter that main frame is asked according to the secondary machine that is connected with communication network comes supervisory communications network bandwidth usage timetable (sending between license terms) on the whole.That is, the data of being managed concentratedly all secondary machines by main frame send number of times and data transmitting time etc., thereby realize QoS.
Secondary machine sends request to main frame in advance and carries out the signal that QoS transmits when transmitting the data that QoS ensured (below, be referred to as QoS and transmit).This signal packet contains the parameter relevant with QoS.Then, main frame extracts this parameter relevant with QoS, and according to this parameter and communication network present utilize situation, can judgement be carried out QoS and transmit.Can carry out the QoS transmission if be judged as, transmit, on the contrary, can not carry out the QoS transmission, transmit just main frame refuses that secondary machine is carried out QoS if be judged as just main frame allows that secondary machine is carried out QoS.For example, when certain secondary machine A sends request and carries out signal that QoS transmits, if transmit because of other secondary machine B are carrying out QoS, and can't guarantee that secondary machine A carries out QoS needed abundant bandwidth when transmitting, main frame will be refused the QoS that secondary machine A sends and transmit request.
At this, main frame manages the bandwidth settings timetable often, transmits so that each secondary machine can carry out QoS.And main frame sends the transmission enabling signal that includes between QoS transmission license terms according to this timetable to secondary machine, gives the permission that secondary machine QoS transmits thus.Secondary machine above-mentioned transmission enabling signal notified during within, carry out data and transmit.
When transmitting a plurality of content simultaneously, not, but need carry out QoS control each content to each packet.For example, send simultaneously when looking audio content and audio content at certain communicator, normally different to the desired item of necessary QoS of each content.
Thus, in parameter guarantee type QoS, each data flow is carried out the QoS management.Data flow is meant needs a series of data of transmission continuously.Need continuously a series of data of transmission for example can be 1 and look audio content or 1 meaningful and complete data such as audio content.Therefore, subordinate has a plurality of packets in 1 data flow.In the following description, the data flow of looking audio content is also referred to as video/audio data flow.
In order to decide the timetable that utilizes of bandwidth by each data flow, main frame need learn which data flow packet belongs to.For this reason, secondary machine will be attached in order to the stream identifying information of affiliated data flow of expression packet in the relevant parameter of QoS and send to main frame.When main frame sends enabling signal to secondary machine, be transmission permission, in sending enabling signal, add the identifying information that becomes a mandarin and notify which data flow in order to show.Next, carry out only the represented data packets in data flows of stream identifying information of secondary machine that data send, send comprising in the transmission enabling signal by above-mentioned notice.Thus, can carry out QoS control to each data flow.
At this,, for example can be following any combination or all following combinations: MAC (Media Access Control: media interviews control) transmission destination MAC Address and the transmit leg MAC Address in the head as the stream identifying information; IP address, transmission destination and transmit leg IP address in the IP head; Transmission destination port numbers and transmit leg port numbers in TCP (transmission control protocol) head (or UDP (user datagram) head); The stream label of IPv6 head (Flow Label) field; VID in the VLAN of Ethernet frame head (VLAN) sign (VLAN Identifier: the VLAN identifier) field etc.
(establishing method of QoS)
Generally speaking, QoS realizes by layer 2 in OSI (Open Systems Interconnection: open system the is interconnected) reference pattern or layer 3.Below, the layer of realizing QoS is called the QoS key-course.
No matter be preferential control type QoS or parameter guarantee type QoS, in order to realize QoS, necessity that the QoS key-course all needs to be grasped the data that tendency to develop send transmits quality.But the information that transmits quality is general is all managed by the layer more upper than QoS key-course.
For example, the bandwidth of corresponding PLC control is to be realized by MAC layer (sublayer of the layer 2 in the OSI reference pattern), yet actual what data what transmitted be, only may learn in application layer (layer 7 in the OSI reference pattern).For example, in layer 7, application program is given lower layer with data passes after finishing content choice and transmission preparations.At this, for lower layer, the data sheet that passes over from upper layer is data, therefore can't grasp the inherent content of these data, also can't grasp the application program of these data from which kind of.
Therefore, as preferably, began before the QoS key-course sends data at upper layer, add by upper course QoS key-course and send the qos parameter that contains following information, set request to carry out QoS, those information comprise: the data that expression is transmitted are from the information of which kind of program; The information of representing the purposes of these data; These and the relevant information of data that transmits such as the bandwidth of desired guarantee, delay tolerable limit value, packet size when in the MAC layer, transmitting.
But,, therefore, when design is respectively installed,, in most cases do not imagine the existence of QoS key-course for upper layer because the QoS technology still fails extensively to popularize at present.Therefore, above-mentioned structure is not able to actual installation.That is, server is not to send after the value of the precedence field of packet is set again, and perhaps sets carry out QoS at this data flow request before beginning to send data flow.
(prior art)
By being structures such as above-mentioned preferential control type QoS and parameter guarantee type QoS the basic technology enforcement usefulness of going forward side by side, can avoid the access conflict in the communication network integral body, and can realize QoS.
As the technology that realizes QoS, disclosed a kind of packet forwarding device of controlling that packet is transmitted in the patent documentation 1.In this packet forwarding device, at first be extracted in when negotiation via the packet (decision in advance to which port monitors) of particular port, send IP address, destination and transmit leg IP address, then the IP address, transmission destination that relates to said extracted and the packet of transmit leg IP address are analyzed, thus used port numbers when obtaining data communication.Then, the packet that preferentially the IP address, transmission destination of using said extracted and transmit leg IP address and the above-mentioned port numbers that obtains is transmitted transmits.
According to the technology that discloses in the patent documentation 1, among the packet via particular port during from negotiation, final decision goes out the packet that should preferentially be transmitted.That is, according to employed port numbers when negotiating, the transmission priority of determination data bag.When for example, looking in the audio frequency delivery service negotiation in used port numbers and the telephone service during negotiation used port numbers be different.Therefore, if the technology that utilization patent documentation 1 is disclosed then is to decide priority by each negotiation agreement.
Therefore, the technology that is disclosed according to patent documentation 1 has in use between each service of identical negotiation agreement and can't further set priority.For example, when occurring with the provide and deliver service (supposing service A) of looking audio content and provide and deliver other when looking the service (supposing it is service B) of audio content with same negotiation agreement P of certain negotiation agreement (supposing agreement P), these two kinds of services all are to use same port numbers to transmit the negotiation packet.Therefore, if the technology that utilization patent documentation 1 is disclosed just can't only preferentially transmit the packet of serving B.As will preferentially transmitting the packet of service B, just need the preferential whole service data packet of looking the audio content dispensing with agreement P that transmit.Its result, the packet that is preferentially transmitted on communication network increases, thereby causes the bandwidth deficiency, and occurs the problem of data playback disorder in data sink.
Below, with reference to Figure 14, illustrate that not enough situation takes place the transmission bandwidth when preferentially transmitting video/audio data flow on the PLC network.Figure 14 is the figure that is illustrated in the state of the transmission bandwidth when preferentially transmitting 2 video/audio data flows on the PLC network.At first, suppose to begin to transmit the data flow of FTP at moment T1.The data flow of supposing FTP is not to be the preferential object that transmits (non-preferential).At moment T1, owing to only transmit the data flow of FTP, therefore, but the data flow of FTP is monopolized the utilized bandwidth (20Mbps) on the PLC network.
Then, suppose to begin to transmit the data flow of looking audio frequency 1 that should preferentially be transmitted at moment T2.Suppose that the data flow of looking audio frequency 1 has the fixed bit speed of 15Mbps.At this moment, as shown in the figure, but the data flow of looking audio frequency 1 that the 15Mbps in the utilized bandwidth of the 20Mbps on the PLC network is preferentially transmitted account for, remaining 5Mbps is used to transmit non-preferential FTP data flow.
Then, further hypothesis begins to transmit the data flow of looking audio frequency 2 that should preferentially be transmitted at moment T3.The data flow of looking audio frequency 2 also has the fixed bit speed of 15Mbps.At this moment, need the preferential data flow that transmits to have 2, needed total bandwidth has surpassed 20Mbps.In this example, suppose priorities is only set 2 grades (preferential and non-preferential) for, has equal priority owing to look the data flow of audio frequency 1 with the data flow of looking audio frequency 2, and therefore, bandwidth will both impartial uses by this.That is, as shown in the figure, the data flow of looking audio frequency 1 is transmitted with 10Mbps respectively with the data flow of looking audio frequency 2.That is, for the data flow of looking audio frequency 1 and the data flow of looking audio frequency 2, they all lack the bandwidth of 5Mbps.Therefore, since moment T3, look the receiving system of data flow of audio frequency 1 and the data that receiving system received of looking the data flow of audio frequency 2 all can take place damaged, thereby cause the disorder of data playback.In addition, after moment T3, do not transmit non-preferential FTP data flow owing to there is remaining bandwidth can be used for, therefore presumably, the FTP data flow can not be transmitted.Yet still can transmit a spot of data in fact sometimes.
Below, with reference to Figure 15, the situation when a certain side to 2 video/audio data flows preferentially transmits only is described.Figure 15 is the figure of the transmission bandwidth state when only being illustrated on the PLC network a certain side to 2 video/audio data flows and preferentially transmitting.At this, the data flow of supposing to look audio frequency 1 is not to be the preferential object that transmits (non-preferential).And hypothesis is since moment T2, in the process that non-preferential FTP data flow and the non-preferential data flow of looking audio frequency 1 are transmitted, 3 begins to transmit the data flow of looking audio frequency 2 that should preferentially be transmitted from constantly.At this moment, as shown in the figure, are preferential objects that transmit owing to look the data flow of audio frequency 2, therefore can use the transmission bandwidth of 15Mbps.Thus, in the receiving system of data flow of audio frequency 2 is looked in reception, can not receive the damaged of data, thereby can not occur the disorder of data playback yet.About remaining 5Mbps, it is used in by the equalization branch and transmits non-preferential FTP data flow and the non-preferential data flow of looking audio frequency 1.
As mentioned above, when the data flow that exists the identical negotiation agreement of a plurality of uses (or though employed negotiation agreement difference, employed port numbers is identical) to be transmitted, only preferably can control wherein specific data stream is preferentially transmitted.For example, look the data flow and the low clear data flow of looking audio frequency of audio frequency when on same communication network, transmitting high definition, and when the transmission bandwidth of communication network is not enough to the both preferentially transmitted, preferably can control the data flow that preferential transmission high definition is looked audio frequency.But the technology that patent documentation 1 is disclosed can't realize this problem.
Patent documentation 1: the open communique of Japan's patent application, the spy opened the 2003-87300 communique (open day: on March 20th, 2003).
Summary of the invention
The present invention is in view of the above-mentioned problems and research and development, and its purpose is to provide a kind of relay that can preferentially transmit the packet that belongs to this data flow according to the domain name of the dispensing device of data flow etc.In addition, other purposes of the present invention are to provide a kind of communication control unit that can set the priority of data packets that belongs to this data flow according to the domain name of the dispensing device of data flow.
For solving the above problems, relay of the present invention is the relay that the packet of receiving and dispatching is carried out relaying between data sending device and data sink, this relay is characterised in that, possess: QoS object storage portion, store the domain name in the affiliated territory of the above-mentioned data sending device that the QoS object data bag that becomes the QoS object is sent at least; Domain name/address solves packet and obtains the unit, domain name/address of obtaining in order to the address that solves above-mentioned data sending device solves packet, wherein, above-mentioned domain name/address solves sending method, device, domain name/address that the domain name in the affiliated territory that comprises this data sending device in the packet and this data sending device, domain name/address solve packet and solves the transmission destination device of packet, above-mentioned data sink, wherein at least one side's address; The prior information generation unit, obtain domain name/address of obtaining the unit and solve the domain name of storing in domain name contained in the packet and the above-mentioned QoS object storage portion when consistent when above-mentioned domain name/address solves packet, extract above-mentioned domain name/address solution packet and obtain one or more contained addresses in domain name/address solution packet of obtaining the unit, and generate the address group that the address constituted by this extraction, and the address group that will generate is deposited to packet prior information storage part; The preferential delivery unit of packet, when when consistent, preferentially transmit above-mentioned preferential transmission and handle by the packet of relaying by certain address faciation of storing in the above-mentioned address group that one or more addresses constituted that comprises in by the packet of relaying and the above-mentioned packet prior information storage part.
In said structure, store the domain name in the affiliated territory of the above-mentioned data sending device that above-mentioned QoS object data bag is sent at least.And obtain above-mentioned domain name/address and solve packet.Then, when the domain name of storing in above-mentioned obtained domain name/address solves the domain name that comprises in the packet and QoS object storage portion is consistent, extract above-mentioned obtained domain name/address and solve one or more addresses that comprise in the packet, and depositing to packet prior information storage part by the address group that the address constituted of this extraction.When certain address faciation of storing in the address group that one or more addresses constituted that comprises in the packet by this relay relaying and the packet prior information storage part is consistent, preferentially transmits above-mentioned preferential transmission and handle by the packet of relaying.
Thus, can solve packet,, deposit to packet prior information storage part by the address group that the address constitutes that comprises in the packet that will preferentially transmit by utilizing QoS object storage portion and domain name/address.Therefore, after, when the address group that one or more addresses constituted that comprises in the packet by this relay relaying is consistent with address stored faciation in the packet prior information storage part, just can preferentially transmit above-mentioned by the packet of relaying.
At this, solve packet in order to domain name/address that the address to the data sending device that sends packet solves about (1); (2) solve packet by this domain name/address and solved the packet of the receiving system that data sending device sends to of address, they all comprise the IP address of same data sending device and the IP address of same data sink at least.Therefore, by the domain name of above-mentioned (1)/address solve the address group that the address constituted that comprises in the packet and, the address group that the address constituted that comprises in the packet by above-mentioned (2) is might be corresponding to.
When the domain name by above-mentioned (1)/address solves packet and solved the domain name of storing in domain name and the QoS object storage portion in affiliated territory of data sending device of address when consistent, the storage addresses group solves the address group that the address constituted that comprises in the packet by the domain name of above-mentioned (1)/address in the packet prior information storage part, so the storage addresses group is just consistent with the address group that the address constituted that comprises in the packet by above-mentioned (2) in the packet prior information storage part.Its result can handle by above-mentioned preferential transmission and preferentially transmit the packet of above-mentioned (2).
That is, to the packet that data sink sends, can preferentially transmit the data flow of forming by this packet about the data sending device that has the domain name of storing in the QoS object storage portion.
Thus, for example imagine from domain name different respectively look that the audio frequency delivery server sends, use the data flow of content that identical negotiation agreement is arranged (for example high definition look audio content and the low audio content of looking clearly) same communication network, to be transmitted.Under this situation, if each data flow is all preferentially transmitted, then the transmission bandwidth of communication network can be not enough, at this moment, by the present invention, can be only the data flow that the audio frequency delivery server sends to data sink of looking of the domain name of storing be preferentially transmitted (for example, only the data flow of looking audio content to high definition transmits) from have QoS object storage portion, even therefore under above-mentioned condition, also can realize QoS.
In other words, can only preferentially transmit the data packets in data flows that needs the preferential content that transmits (high definition look audio content etc.), and preferentially do not transmit the data packets in data flows of other guide (low look clearly audio content etc.), so in the data sink that receives the data flow that is preferentially transmitted, the disorder in the time of can suppressing to look audio playback.
For solving the above problems, communication control unit of the present invention is, the communication control unit that the transmission that is sent to the communication data packet that comprises in the data flow of data sink by data sending device is controlled, wherein, above-mentioned data sending device is subordinated to the territory, above-mentioned data flow is made up of a plurality of above-mentioned communication data packet, above-mentioned data sink is in the 1st requirement that has sent in order to the mailing address of above-mentioned data sending device is asked, and after having obtained mailing address as the above-mentioned data sending device of the 1st answer that requires, send in order to ask the 2nd requirement of above-mentioned data flow to above-mentioned data sending device according to this mailing address, as the 2nd answer that requires, above-mentioned data sending device sends above-mentioned data flow to above-mentioned data sink, this communication control unit is characterised in that: the above-mentioned the 1st includes the domain name in affiliated territory of above-mentioned data sending device and the mailing address of above-mentioned data sink in requiring, possess, domain name/address extraction unit is extracted the domain name of above-mentioned data sending device and the mailing address of above-mentioned data sink from the above-mentioned the 1st requires; The unit is obtained in the address, and the domain name that obtains the above-mentioned data sending device that extracts with above-mentioned domain name/address extraction unit is corresponding, the mailing address of above-mentioned data sending device; The 1st storage part is with the domain name of above-mentioned data sending device and will be set transmission priority to above-mentioned communication data packet, storage accordingly mutually; Territory priority obtains the unit, from above-mentioned the 1st storage part, obtains the corresponding transmission priority of domain name of the above-mentioned data sending device that extracts with above-mentioned domain name/address extraction unit; The priority data generation unit, group and above-mentioned territory priority that the mailing address of the above-mentioned data sink that is extracted by above-mentioned domain name/address extraction unit and mailing address that the above-mentioned data sending device of obtaining the unit is obtained in above-mentioned address are formed obtain the obtained transmission priority in unit, deposit accordingly mutually to the 2nd storage part, form in each communication data packet of above-mentioned data flow and include, become the mailing address of above-mentioned data sending device of the transmit leg of this communication data packet; Become the mailing address of above-mentioned data sink of the transmission destination of this communication data packet; The transmission priority of this communication data packet also possesses, and sender address/transmission destination-address extraction unit from the above-mentioned communication data packet of forming above-mentioned data flow, is extracted the mailing address of above-mentioned transmit leg and the mailing address of above-mentioned transmission destination; Packet priority obtains the unit, group about the mailing address of the mailing address of the above-mentioned transmit leg that extracted by above-mentioned sender address/transmission destination-address extraction unit and above-mentioned transmission destination is formed obtains from above-mentioned the 2nd storage part with this and organizes corresponding transmission priority; Above-mentioned packet priority is obtained the above-mentioned priority that obtains the unit as the priority of above-mentioned communication data packet and set to this communication data packet in packet priority level initializing unit.
In said structure, can from the above-mentioned the 1st requires, extract the domain name of above-mentioned data sending device and the mailing address of above-mentioned data sink.In addition, can obtain mailing address corresponding with the domain name of above extracted above-mentioned data sending device, above-mentioned data sending device.In addition, the 1st storage part is with the domain name of above-mentioned data sending device and will be set transmission priority to above-mentioned communication data packet, storage accordingly mutually.Thereby can from the 1st storage part, obtain and the corresponding transmission priority of the domain name of above extracted above-mentioned data sending device.In addition, can group and above-mentioned obtained transmission priority that be made up of the mailing address of the mailing address of above extracted above-mentioned data sink and above-mentioned obtained above-mentioned data sending device be deposited mutually accordingly to the 2nd storage part.
In addition, can from above-mentioned communication data packet, extract the mailing address of above-mentioned transmit leg and the mailing address of above-mentioned transmission destination.In addition, the group about being made up of the mailing address of the mailing address of above extracted above-mentioned transmit leg and above-mentioned transmission destination can obtain with this from above-mentioned the 2nd storage part and organize corresponding transmission priority.In addition, can be with above-mentioned obtained transmission priority as the priority of the transmission of above-mentioned communication data packet and set to this communication data packet.
Thus, can become the corresponding above-mentioned priority level initializing of each and the domain name of above-mentioned data sending device the priority of the transmission of above-mentioned communication data packet, and, control the transmission of above-mentioned communication data packet according to the priority of this setting.
That is,, can improve the priority of the communication data packet that sends out from this data sending device, communication data packet be transmitted thereby can control preferentially by improving the corresponding above-mentioned priority of domain name with above-mentioned data sending device.In addition,, can reduce, other communication data packet be transmitted thereby can control preferentially from the priority of the communication data packet of this data sending device transmission by reducing and the corresponding above-mentioned priority of above-mentioned data sending device.
Furthermore, with same negotiation agreement (or, though the negotiation agreement difference of using, but the port numbers of using is identical) and the communication data packet that transmits is each other, when mutually not simultaneously, can also set the difference of priority as the domain name of the data sending device of this communication data packet transmit leg.
For example, the same negotiation agreement of imagination use (or, though the negotiation agreement difference of using, but the port numbers of using is identical), at the same time the phase send from certain look high definition that the audio frequency delivery server sends look the data flow of audio content communication data packet A and, communication data packet B from the low clear data flow of looking audio content that other look the audio frequency delivery server sends, even in this case, as long as handle must be higher than with the corresponding priority level initializing of the domain name of looking the audio frequency delivery server that provides above-mentioned high definition to look audio content and the above-mentioned low clear corresponding priority of the domain name of looking the audio frequency delivery server of looking audio content is provided, just can preferentially transmit communication data packet A.
Therefore, if as prior art, when use with the negotiation agreement in the corresponding priority of port numbers used preferentially transmit communication data packet A and communication data packet B the two the time, the transmission bandwidth of communication network just may be not enough, thereby cause the audio playback of looking in the data sink to get muddled.In contrast to this, communication control unit of the present invention can be only preferentially transmits the communication data packet that the audio frequency delivery server sent of looking that has corresponding to the domain name of high priority, and preferentially the communication data packet that the audio frequency delivery server sent of looking that has corresponding to the domain name of low priority is not transmitted.Therefore, the data flow that the audio frequency delivery server is sent of looking about the domain name that has corresponding above-mentioned high priority can suppress the audio frequency disorder of looking that takes place in the data sink that receives this data flow.
Promptly, respectively look that the audio frequency delivery server is transmitted under the situation that, as to use content that identical negotiation agreement is arranged (for example high definition look audio content and the low audio content of looking clearly) data flow is transmitted in same communication network different by domain name, if each data flow is all preferentially transmitted, then the transmission bandwidth of communication network can be not enough.At this moment,, can only preferentially transmit (for example, only the data flow of looking audio content to high definition transmits), even therefore under above-mentioned condition, also can realize QoS according to domain name to certain data flow by the present invention.
In addition, for solving the above problems, communication control unit of the present invention is, the transmission that is sent to the communication data packet that comprises in the data flow of data sink by data sending device is controlled, and this communication data packet is carried out the communication control unit of relaying, wherein, above-mentioned data sending device is subordinated to the territory, above-mentioned data flow is made up of a plurality of above-mentioned communication data packet, above-mentioned data sink is in the 1st requirement that has sent in order to the mailing address of above-mentioned data sending device is asked, and after having obtained mailing address as the above-mentioned data sending device of the 1st answer that requires, send in order to ask the 2nd requirement of above-mentioned data flow to above-mentioned data sending device according to this mailing address, as the 2nd answer that requires, above-mentioned data sending device sends above-mentioned data flow to above-mentioned data sink, this communication control unit is characterised in that: the domain name that includes the affiliated territory of above-mentioned data sending device in the above-mentioned the 1st answer that requires, the mailing address of above-mentioned data sending device, the mailing address of above-mentioned data sink, possess, domain name/address extraction unit, the domain name of the above-mentioned data sending device of extraction from the above-mentioned the 1st answer that requires of this communication control unit institute relaying, the mailing address of above-mentioned data sending device, the mailing address of above-mentioned data sink; The 1st storage part is with the domain name of above-mentioned data sending device and will be set transmission priority to above-mentioned communication data packet, storage accordingly mutually; Territory priority obtains the unit, from above-mentioned the 1st storage part, obtains the corresponding transmission priority of domain name of the above-mentioned data sending device that extracts with above-mentioned domain name/address extraction unit; The priority data generation unit, the group that the mailing address of the mailing address of the above-mentioned data sending device that is extracted by above-mentioned domain name/address extraction unit and above-mentioned data sink is formed, and above-mentioned territory priority obtains the obtained transmission priority in unit, deposit accordingly mutually to the 2nd storage part, form in each communication data packet of above-mentioned data flow and include, become the mailing address of above-mentioned data sending device of transmit leg of this communication data packet and the mailing address of above-mentioned data sink that becomes the transmission destination of this communication data packet, also possess, sender address/transmission destination-address extraction unit, from the above-mentioned communication data packet of forming above-mentioned data flow, extract the mailing address of above-mentioned transmit leg and the mailing address of above-mentioned transmission destination; Packet priority obtains the unit, group about the mailing address of the mailing address of the above-mentioned transmit leg that extracted by above-mentioned sender address/transmission destination-address extraction unit and above-mentioned transmission destination is formed obtains from above-mentioned the 2nd storage part with this and organizes corresponding transmission priority; The packet transmit control unit is obtained the obtained above-mentioned transmission priority in unit according to above-mentioned packet priority, and the transmission of the above-mentioned communication data packet of forming above-mentioned data flow is controlled.
In said structure, can from the 1st answer that requires, extract the domain name of above-mentioned data sending device, the mailing address of above-mentioned data sending device, the mailing address of above-mentioned data sink.In addition, the 1st storage part is with the domain name of above-mentioned data sending device and will be set transmission priority to above-mentioned communication data packet, storage accordingly mutually.Thereby can from the 1st storage part, obtain and the corresponding transmission priority of the domain name of above extracted above-mentioned data sending device.In addition, can obtain the obtained transmission priority in unit to group and the above-mentioned territory priority formed by the mailing address of the mailing address of above extracted above-mentioned data sending device and above-mentioned data sink, deposit accordingly to the 2nd storage part mutually.
In addition, can from the above-mentioned communication data packet of forming above-mentioned data flow, extract the mailing address of above-mentioned transmit leg and the mailing address of above-mentioned transmission destination.In addition, the group about being made up of the mailing address of the mailing address of above extracted above-mentioned transmit leg and above-mentioned transmission destination can obtain with this from above-mentioned the 2nd storage part and organize corresponding transmission priority.
At last, can be according to above-mentioned obtained above-mentioned transmission priority, control transmits the above-mentioned communication data packet of forming above-mentioned data flow.
Thus, can control the transmission of above-mentioned communication data packet, and carry out relaying according to the corresponding above-mentioned priority of domain name of each and above-mentioned data sending device.
That is,, can control with high priority and transmit the communication data packet that sends from this data sending device by the corresponding above-mentioned priority of domain name of raising with above-mentioned data sending device.In addition, by the domain name corresponding above-mentioned priority of reduction, can control with low priority and transmit the communication data packet that sends from this data sending device with above-mentioned data sending device.
Furthermore, with same negotiation agreement (or, though the negotiation agreement difference of using, but the port numbers of using is identical) and the communication data packet that transmits is each other, when mutually not simultaneously, can also set the difference of priority as the domain name of the data sending device of this communication data packet transmit leg.
Thus, respectively look that the audio frequency delivery server is transmitted under the situation that, as to use content that identical negotiation agreement is arranged (for example high definition look audio content and the low audio content of looking clearly) data flow is transmitted in same communication network different by domain name, if each data flow is all preferentially transmitted, then the transmission bandwidth of communication network can be not enough.At this moment,, can only preferentially transmit (for example, only the data flow of looking audio content to high definition transmits), even therefore under above-mentioned condition, also can realize QoS according to domain name to certain data flow by the present invention.
In addition, for solving the above problems, relay of the present invention is the relay that packet is carried out relaying, it is characterized in that possessing: QoS object storage portion, and storage becomes the 1st domain name and the 2nd domain name of QoS object at least; Domain name/address solves data packet detecting unit unit, detecting above-mentioned packet by relaying is that the 1st domain name/address is when solving packet, judge that domain name that this detected the 1st domain name/address solves the inquiry object that comprises in the packet is whether consistent with the 1st domain name of storing in the above-mentioned QoS object storage portion, simultaneously, detecting above-mentioned packet by relaying is the 2nd domain name/address when solving packet, judges that domain name that this detected the 2nd domain name/address solves the inquiry object that comprises in the packet is whether consistent with the 2nd domain name of storing in the above-mentioned QoS object storage portion; Priority data generates processing unit, when the result of above-mentioned judgement is, the 1st domain name of storing in the domain name that above-mentioned the 1st domain name/address solves the inquiry object that comprises in the packet and the above-mentioned QoS object storage portion is consistent, and when the 2nd domain name of storing in the domain name that above-mentioned the 2nd domain name/address solves the inquiry object that comprises in the packet and the above-mentioned QoS object storage portion is consistent, from above-mentioned the 1st domain name/address solution packet and above-mentioned the 2nd domain name/address solution packet, extract the address, and generate the priority data of the address comprise this extraction, and the priority data that will generate is deposited to packet priority storage part; Packet preferentially transmits processing unit, when the address that comprises in the above-mentioned priority data of the above-mentioned address that comprises in by the packet of relaying and above-mentioned packet priority storage portion stores is consistent, preferentially above-mentioned packet is carried out relaying.
In said structure, QoS object storage portion stores the 1st domain name and the 2nd domain name that becomes the QoS object at least.Can be the 1st domain name/address when solving packet detecting above-mentioned packet, judge that domain name that this detected the 1st domain name/address solves the inquiry object that comprises in the packet is whether consistent with the 1st domain name of storing in the above-mentioned QoS object storage portion by relaying.In addition, can be DNS (Domain Name System: when the 2nd domain name the domain name supervising system)/address solves packet, judge that domain name that this detected the 2nd domain name/address solves the inquiry object that comprises in the packet is whether consistent with the 2nd domain name of storing in the above-mentioned QoS object storage portion detecting above-mentioned packet by relaying.In addition, when the result of above-mentioned judgement is, the 1st domain name of storing in the domain name that above-mentioned the 1st domain name/address solves the inquiry object that comprises in the packet and the above-mentioned QoS object storage portion is consistent, and when the 2nd domain name of storing in the domain name that above-mentioned the 2nd domain name/address solves the inquiry object that comprises in the packet and the above-mentioned QoS object storage portion is consistent, can extract above-mentioned the 1st domain name/address and solve the address that comprises in packet and above-mentioned the 2nd domain name/address solution packet, and generate the priority data of the address comprise this extraction, and the priority data that will generate is deposited to packet priority storage part.When the address that comprises in the above-mentioned priority data of the above-mentioned address that comprises in by the packet of relaying and above-mentioned packet priority storage portion stores is consistent, can preferentially carry out relaying to above-mentioned packet.
Thus, group that can corresponding domain name is come the above-mentioned packet of relaying.
Therefore, when the situation that in same communication network, is transmitted by the different data flow of respectively looking audio frequency delivery server content that transmitted, that used identical negotiation agreement (for example high definition look audio content and the low audio content of looking clearly) of domain name, if each data flow is all preferentially transmitted, then the transmission bandwidth of communication network can be not enough.At this moment,, can only preferentially transmit (for example, only the data flow of looking audio content to high definition transmits), even therefore under above-mentioned condition, also can realize QoS according to the group of domain name to certain data flow by the present invention.
Other purposes of the present invention, feature and superiorly in following record, can become very clear.In addition, benefit of the present invention will become clear and definite by the following description and accompanying drawing.
Description of drawings
Fig. 1 is the block diagram of schematic configuration of the communication control unit (HGW) of expression one embodiment of the present invention.
Fig. 2 is the pattern block diagram of basic structure example that expression includes the communication control system of communication control unit of the present invention.
Fig. 3 is the pattern block diagram of the concrete structure example of expression communication control system shown in Figure 2.
Fig. 4 is illustrated in the communication control system shown in Figure 3, data source and sink STB and PC during from request msg to the mode sequences figure that receives the flow process example till the data.
Fig. 5 is the block diagram as the schematic configuration of the PLC adapter of relay of expression in the communication control system shown in Figure 2.
Fig. 6 is the outline flowchart of the processing of expression communication control unit shown in Figure 1 (HGW) when having received packet.
Fig. 7 is that the priority data in the expression communication control unit shown in Figure 1 (HGW) generates the outline flowchart of handling.
Fig. 8 is the outline flowchart that the packet priority change in the expression communication control unit shown in Figure 1 (HGW) is handled.
Fig. 9 is the picture example ideograph that simple and easy version QoS object that expression communication control unit shown in Figure 1 (HGW) is provided is set picture.
Figure 10 is the picture example ideograph that detailed version QoS object that expression communication control unit shown in Figure 1 (HGW) is provided is set picture.
Figure 11 is the pattern block diagram of other concrete structure examples of expression communication control system shown in Figure 2.
Figure 12 is the block diagram as the schematic configuration of the wireless lan adapter of relay of expression in the communication control system shown in Figure 2.
Figure 13 is the pattern block diagram of other concrete structure examples of expression communication control system shown in Figure 2.
Figure 14 is the figure that expression utilizes prior art preferential transmission bandwidth state when transmitting 2 video/audio data flows on the PLC network.
Figure 15 is the figure of the transmission bandwidth state of expression when utilizing prior art on the PLC network a certain side in 2 video/audio data flows preferentially to be transmitted.
Figure 16 is expression, in communication control system shown in Figure 3, and the mode sequences figure of the example when video/audio wraps under the situation about preferentially not transmitted via communication control unit shown in Figure 1 (HGW).
Figure 17 is illustrated in the communication control system shown in Figure 3, the mode sequences figure of the example when all the video/audio bag is preferentially transmitted.
Figure 18 is the pattern block diagram of basic structure example of the communication control system of the expression communication control unit (HGW) that includes an embodiment of the present invention.
Figure 19 is the block diagram of basic structure example of the communication control system of the expression relay (PLC adapter) that includes an embodiment of the present invention.
Figure 20 is the pattern block diagram of a concrete structure example of expression communication control system shown in Figure 19.
Figure 21 is illustrated in the communication control system shown in Figure 19, data source and sink STB during from request msg to the mode sequences figure that receives the flow process example till the data.
Figure 22 is the block diagram of schematic configuration of the relay (PLC adapter) of expression other execution modes of the present invention.
Figure 23 is expression, in the communication control system of the relay that includes other execution modes of the present invention (PLC adapter), data source and sink STB during from request msg to the mode sequences figure that receives the flow process example till the data.
(label declaration)
11 packets pass on handling part (packet transmit control unit)
12 DNS handling parts (domain name/address extraction unit)
13 priority datas generate handling part (territory priority obtain unit, address obtain the unit,
The priority data generation unit)
(sender address/transmission destination-address extracts 14 packet priority change handling parts
Unit, packet priority obtain unit, packet priority level initializing unit, data
Wrap preferential delivery unit)
15 priority datas are eliminated handling part (prior information elimination unit)
16 QoS objects are set handling part (QoS object setup unit)
17 QoS objects upgrade handling part
21 server address storage parts
22 QoS object storage portions (the 1st storage part)
23 packet priority storage parts (the 2nd storage part)
31 WAN side Department of Communication Forces
32 LAN side Department of Communication Forces
33 ethernet communication portions (packet maintenance/issue unit)
34 WLAN Department of Communication Forces
100 communication control units
101 HGW (communication control unit)
111 QoS handling parts
120 communication control units
121 HGW (communication control unit)
131 ethernet communication portions
132 plc communication portions
161 QoS objects are set picture
162 QoS objects are set picture
211 packets pass on handling part (packet transmit control unit)
(domain name/address extraction unit, domain name/address solve packet and obtain 212 DNS test sections
Unit, domain name/address solve data packet detecting unit unit)
213 priority datas generate handling part, and (prior information generation unit, territory priority obtain list
Unit, priority data generation place are obtained in unit, priority data generation unit, address
The reason unit)
214 packets preferentially transmit handling part, and (sender address/transmission destination-address extracts single
Unit, packet priority obtain unit, packet and preferentially transmit processing unit, data
Wrap preferential delivery unit)
215 priority datas are eliminated handling part (prior information elimination unit)
222 QoS object storage portions (the 1st storage part)
223 packet priority storage parts (packet prior information storage part, the 2nd storage part)
231 ethernet communication portions
232 plc communication portions (packet maintenance/issue unit)
300 relays
301 PLC adapters
302 PLC adapters
303 PLC adapters
310 relays
311 PLC adapters (relay)
312 PLC adapters (relay)
313 PLC adapters (relay)
400 data source and sinks (data sink)
402 STB (data sink)
403 PC (data sink)
404 STB (data sink)
405 television sets
406 television sets
407 PC (data sink)
500 the 1st communication networks
501 PLC networks
600 servers (data sending device)
601 dns servers
602 update service devices
603 look audio frequency delivery server (data sending device)
604 look audio frequency delivery server (data sending device)
605 Web servers
700 the 2nd communication networks
701 the Internets
801 wireless lan adapters
802 wireless lan adapters
803 wireless lan adapters
811 QoS handling parts
831 ethernet communication portions
832 WLAN Department of Communication Forces
901 wireless lan networks
Embodiment
(execution mode 1)
Below, according to Fig. 1～Figure 13 one embodiment of the present invention is described.
In the present embodiment, " packet " is meant the communication data packet that transmits on communication network.
In addition, in the present embodiment, " data flow " is meant that being subordinated to need to transmit continuously a certain connects data, continuity packet group.The so-called a certain data that connect that need to transmit continuously for example refer to, look the whole data that audio content or 1 audio content etc. have meaning for 1.For instance, when 1 of being kept in the devices such as server was looked audio content etc. and sends to receiving system as a plurality of packets that connect, the above-mentioned one a plurality of packets that connect were exactly data flow.
In addition, look the data flow of audio content and the data flow of web content and be hereinafter referred to as " video/audio data flow " and " Web data flow ".In addition, the packet that belongs to video/audio data flow is referred to as " video/audio bag ", and the packet that belongs to the Web data flow is referred to as " Web packet ".
In addition, in the present embodiment, suppose that the priority (transmission priority) of video/audio bag is configured to than Web priority of data packets height.Therefore, the video/audio bag has precedence over the Web packet and is sent to communication network.
(priority of data packets)
In the present embodiment, the priority of data packets that transmits on IP network is by being called as DSCP (Differentiated Services Code Point: the represented value of upper 3 bits field differentiated Services code point), or the represented value of upper 3 bits in the field that is called as DSCP that is comprised by the communication class field (traffic class field) in IPv6 (IP Version 6) in IPv4 (the IP Version 4) head on the 2nd byte ahead.Therefore, the desirable value of the priority of data packets that on IP network, transmits from 0 (priority is minimum) to 8 grades of 7 (priority is the highest).
At this, dscp field was used to definition of T OS in the past, and (Type Of Service: COS), it uses upper 6 bits in the 2nd byte of IPv4 head, and maximum can be represented the priority of 64 grades.Upper 3 bits and TOS field in the dscp field have interchangeability.
In addition, in the present embodiment, (Power Line Communcation: power line communication) network is to use the LAN of the PLC that follows Home Plug AV specification (HomePlug AV Specification Version1.0.10: family's socket is looked audio frequency specification 1.0.10 version) to imagination PLC.And, for the packet that on the PLC network, transmits, can (Channel Access Priority: the priority channel access priority), desirable 4 grade points be carried out priority control according to being called as CAP.
At this, DSCP and CAP can exchange each other.In HomePlug AV specification, elect DSCP and CAP to have the mapping relations shown in the following table 1.Table 1 is the table of a mapping example between expression DSCP and CAP.As shown in table 1, the value of DSCP is 0 or 3 o'clock, and the value of corresponding CAP is 1; The value of DSCP is 1 or 2 o'clock, and the value of corresponding CAP is 0; The value of DSCP is 4 or 5 o'clock, and the value of corresponding CAP is 2; The value of DSCP is 6 or 7 o'clock, and the value of corresponding CAP is 3.The DSCP value of being elected in addition, is to stipulate according to the kind of packet.For example, the DSCP value corresponding with the video/audio bag is pushed elects " 5 " as, and the DSCP value corresponding with packets of audio data is pushed to be elected " 6 " as (what put down in writing strictly speaking, is not to be the DSCP value, but values of user-priority, but also can be considered as identical with the DSCP value values of user-priority.This both relation is omitted its detailed description by IEEE802.1D specification defined at this).
About the corresponding relation of DSCP and CAP, be not to realize can having other corresponding relations according to the regulation of HomePlugAV specification yet.
(table 1)
Figure BPA00001248535700201
The PLC adapter that receives the IP packet extracts the DSCP value in the IP head of this IP packet that receives, and according to example mapping relations as shown in table 1, determines corresponding CAP.Then, according to the CAP of this decision, on the PLC network, packet is preferentially controlled.Store map information as shown in Figure 1 in the PLC adapter when usually, dispatching from the factory etc.In addition,, also can adopt additive method to send, in the present embodiment this is not particularly limited though generally be CAP to be added in the PLC head (MAC layer head) of the packet that is transmitted on the PLC network send.
In addition, about the packet that on WLAN, transmits, also can carry out with wireless lan network on the corresponding preferential control of priority.At this, this priority and DSCP can change mutually, and the mapping between its mapping and DSCP and CAP is roughly the same, therefore omit its explanation.In addition, WLAN in the present embodiment is envisioned for IEEE802.11e or IEEE802.11n.
(basic structure of communication control system)
Below, the basic structure of the communication control system of the communication control unit that includes present embodiment is described with reference to Fig. 2.Fig. 2 is the pattern block diagram of basic structure example of the communication control system of the expression communication control unit that includes present embodiment.As shown in the drawing, above-mentioned communication control system comprises communication control unit 100, server 600, relay 300 and the data source and sink 400 of present embodiment.
In this structure example, the communication control unit 100 of present embodiment and the 2nd communication network 700 and one of them relay 300 that is being connected the 1st communication network 500 are connected in the mode that can intercom mutually.And the packet of 100 pairs of transmitting-receivings between the 1st communication network 500 and the 2nd communication network 700 of communication control unit transmits control, thereby realizes QoS.
Be connected with a plurality of relays 300 on the 1st communication network 500, those relays 300 can communicate mutually.Except the relay 300 that is connected with communication control unit 100, other relays 300 are connected in the mode that can intercom mutually with data source and sink 400 separately.As the 1st communication network 500, the LAN that is based upon in the user family (LAN that has utilized PLC promptly, PLC network and WLAN etc.) is for example arranged.
Relay 300 is used for to data R-T unit 400 (data sink) mutual communication and carries out relaying, perhaps communicating by letter between the server 600 (data sending device) that connecting the 2nd communication network 700 and the data source and sink 400 is carried out relaying.As relay 300, for example have: in as the 1st communication network 500 of PLC network, use, as the PLC adapter of bridge; In as the 1st communication network 500 of WLAN, use, as the wireless network adapter of bridge etc.Relay 300 sends to the 1st communication network 500 to the packet that sends to this relay 300 self from data source and sink 400 or communication control unit 100.Otherwise, send to the packet of this relay 300 self by the 1st communication network 500 being situated between, send to data source and sink 400 or communication control unit 100.Send in the processing at these, can transmit control according to the priority of data packets that arrives this relay 300.
Data source and sink 400 is to be used for sending and receive for example looking audio content, web content, VoIP (Voice over Internet Protocol: the terminal of various data such as data voice over ip protocol), concrete example being as being TV (can connect network), hdd recorder (can connect network), STB, being used for the IP packet is transformed into the VoIP adapter etc. of analog telephone signal.In addition, data source and sink 400 also can comprise be PC (Personal Computer: PC), be built-in with the IP phone machine of VoIP adapter functions, IP camera that video data or voice data are sent as the IP packet, as the NAS of hard disk that can accesses network (Network Attached Storage: the network attached storage device) wait the terminal of these final reception (perhaps sending) data.
Server 600 is the servers that are used to provide various contents, for example can provide to look looking the audio frequency delivery server, the Web server of web content etc. being provided of audio content.The 2nd communication network 700 that is connected with server 600 for example can be to have comprised IP network and NGN (Next Generation Network) waits these Access Networks in interior the Internet.The 2nd communication network 700 can be interconnected and constituted by a plurality of networks.
Next, in said structure, the action of the communication control unit 100 of server 600 when data source and sink 400 communicates describes.At first, server 600 sends data flow to data source and sink 400.Then, the communication control unit 100 on this transmit path is transferred to relay 300 with this data flow from server 600.At this moment, communication control unit 100 is according to transmit leg being the domain name of the server 600 and transmission priority level initializing set is in advance given packet, and then the data flow that will pass on transfers to relay 300, and this also is the principal character of the communicator of present embodiment.
At this, the relay 300 that has received data flow from communication control unit 100 converts this data flow that receives to the signal that can transmit at the 1st communication network 500, and the signal after will changing sends to the 1st communication network 500, thereby data flow is transferred to the relay 300 that is connected with data source and sink 400.Then, the relay 300 that is connected with this data source and sink 400 becomes 400 signals that can receive of data source and sink with its conversion of signals that receives, and the data flow after will changing sends to data source and sink 400.
About from data source and sink 400 action when server 600 communicates, communication control unit 100 and relay 300, except that communication stream to opposite, other structures are same as described above.
As mentioned above, in system shown in Figure 2, server 600 and data source and sink 400 are situated between and receive and send various data flow by communication control unit 100.
(the concrete structure example of communication control system)
Below, the concrete structure example of communication control system shown in Figure 2 is described with reference to Fig. 3.Fig. 3 is the pattern block diagram of a concrete structure example of expression communication control system shown in Figure 2.In Fig. 3, represented the corresponding concrete example of each device shown in Figure 2 and communication network.
In Fig. 3, PLC network 501 is the LAN that utilized PLC, and it is equivalent to the 1st communication network 500 among Fig. 2.In addition, be used in PLC adapter 301, PLC adapter 302 and PLC adapter 303 in the PLC network as bridge and be equivalent to 3 relays 300 among Fig. 2 respectively.
In addition, STB402, PC403 and STB404 are equivalent to 3 data source and sinks 400 shown in Figure 2 respectively.In Fig. 3, in order to show the received audio frequency of looking, STB402 and STB404 are connected in the mode that can intercom mutually with television set 405 and television set 406 respectively.In Fig. 3, though illustrated PLC adapter 302 and PLC adapter 303 separately as independent device, PLC adapter 302 also can be built among STB402 and the STB403, PLC adapter 303 also can be built among the STB404.
In the present embodiment, the IP address (address) of supposing STB402 is " 192.168.0.4 " for the IP address of " 192.168.0.2 ", PC403 for the IP address of " 192.168.0.3 ", STB404.
In addition, in Fig. 3, the Internet 701 is equivalent to the 2nd communication network 700 among Fig. 2.DNS (Domain Name System: the domain name supervising system) server 601, update service device 602, look audio frequency delivery server 603, look audio frequency delivery server 604 and Web server 605 and be equivalent to server 600 among Fig. 2.
Dns server 601 is general dns servers.It is according to each domain name, management and the corresponding IP of this domain name address, and receive the message (packet) of the IP address of inquiry object apparatus being inquired by external device (ED) being used for of sending promptly, include the message (below, be called the DNS apply for information) of the domain name of this inquiry object apparatus.Then, to include inquiry object apparatus contained in the DNS apply for information with this reception the corresponding IP of domain name address, answer message (packet) foldback gives the transmit leg (that is to say, can deal with regard to the title in territory) of DNS apply for information.Below, deserving to be called and stating answer message is DNS answer message (domain name/address solves packet).
Imagination update service device 602 is that (Home Gateway: the institutes such as sale side of 101 (communication control units) data server of management of planning strategies for home gateway), the agreement that is to use regulation provide the server of new data more or refresh routine to HGW to HGW101.In the present embodiment, especially provide data in the QoS object storage portion 22 (aftermentioned) that will be stored in HGW101.Therefore, the state of update service device 602 can externally providing stores in order to the data that constitute the clauses and subclauses in the QoS object storage portion 22 (group of being made up of Service name, domain name, priority).At this, imagination by the manager of update service device 602 with above-mentioned deposit data in update service device 602.In addition, the domain name of storage can adopt general regular record in the update service device 602.About the purposes of regular record, will illustrate afterwards.
Look audio frequency delivery server 603 and look audio frequency delivery server 604 and provide the general audio frequency delivery server of looking of looking audio content.At this, suppose to look audio frequency delivery server 603 and look audio frequency delivery server 604 to provide different service item (when audio frequency is looked in the form of looking audio frequency of for example being provided and delivered or transmission used agreement etc.), at this, the service of looking audio frequency delivery server 603 and being provided is referred to as " looking audio frequency delivery service A ", the service of looking audio frequency delivery server 604 and being provided is referred to as " looking audio frequency delivery service C ".
Web server 605 is data (HTML (the Hyper Text Markup Language: data etc. HTML)) the general Web server that provides to web content.
In the present embodiment, suppose that the IP address of looking audio frequency delivery server 603 is " 101.101.101.1 ", the IP address of looking audio frequency delivery server 604 is " 103.103.103.1 ", and the IP address of looking audio frequency delivery server 605 is " 105.105.105.1 ".In addition, suppose that the domain name of looking audio frequency delivery server 603 is " sv1.vod.service-a.co.jp ", the domain name of looking audio frequency delivery server 604 is " vod1.service-c.ne.jp ".
At last, HGW101 is equivalent to communication control unit shown in Figure 2 100.In addition, imagination HGW101 also possesses the function of general dns server.The dns server that imagination STB402, PC403 and STB404 are considered as HGW101 to give tacit consent to.
In addition, in the present embodiment, suppose HGW101 corresponding LAN side the IP address (promptly, the IP address of a side that is connected with PLC network 501) is " 192.168.0.1 ", the IP address (that is the IP address of a side that is connected with the Internet 701) of supposing the corresponding WAN side of HGW101 is " 100.100.100.1 ".
According to said structure, for example when the user looks audio content and carries out audiovisual by 405 pairs of television sets, STB402 is via PLC adapter 302, PLC adapter 301 and HGW101, from looking audio frequency delivery server 603 or look audio server 604 receiving audio datas stream, and the video/audio data flow that this receives is outputed to television set 405.
Then, HGW101 according to transmit leg be in advance, look audio frequency delivery server 603 or look audio frequency delivery server 604 domain name the priority of corresponding setting, affiliated packet the video/audio data flow that receives from the Internet 701 is set priority, and then to PLC adapter 301 these packets of transmission, this above structure is the principal character of the communication control unit of present embodiment.
In the present embodiment, STB402 is when audio frequency delivery server 603 is looked in visit to imagination, looks the IP address of audio frequency delivery server 603 to dns server 601 inquiries via HGW101.Equally, imagination is inquired the IP address of looking audio frequency delivery server 604 by STB404, is inquired the IP address of looking audio frequency delivery server 605 by PC404.
Below, except that specifying, the relay 300 of being explained is meant single or multiple in they of PLC adapter 301, PLC adapter 302 and PLC adapter 303.In addition, except that specifying, the data source and sink 400 of being explained is meant single or multiple in they of STB402, PC403 and STB404.In addition, except that specifying, the server 600 of being explained is meant dns server 601, update service device 602, look audio frequency delivery server 603, look in they of audio frequency delivery server 604 and Web server 605 single or multiple.
(data source and sink during to the flow process summary that receives till the data) from request msg
Below, with reference to Fig. 4, in the communication control system shown in Figure 3, each flow process summary play receiving audio data when request msg till of STB402 and PC403 describes.Fig. 4 is that model utility is represented in the communication control system shown in Figure 3, and STB402 and PC403 respectively play the sequence chart of the flow process example till the reception data when request msg.
At first, illustrate the user by television set 405 audiovisual by look audio frequency delivery server 603 provided look audio content the time flow process (sequence P1).
The user watches the picture of the television set 405 that is connected with STB402 and operates STB402,, carries out audiovisual by looking this user's operation of looking audio content that audio frequency delivery server 603 is provided that is.STB402 has accepted after user's operation, receive the processing (reception begins to handle) of looking audio content to start with, be used to inquire the DNS apply for information (the 1st requires) (step S201) of the IP address (mailing address) of looking audio frequency delivery server 603 to dns server (the being HGW101 in the present embodiment) transmission of acquiescence.
Begin to handle about reception, can adopt general known method.For example, imagination is generated by STB402 and shows a plurality of menu screens of looking the thumbnail of audio content, and this menu screen is outputed to television set 405 as vision signal, and the display part by television set 405 shows this menu screen then.The data of this picture are recorded and narrated by for example HTML, and provided by being different from other portal servers (not shown) of looking audio frequency delivery server 60, and visit portal server by STB402 via the Internet 701, thereby obtain HTML (this communication sequence is expression in the drawings not).Each thumbnail is looked URI (the Uniform Resource Identifiers: the unified resource identifier) form corresponding relation of audio content storage with expression.
The user by straighforward operation of STB402 etc. has been selected think audiovisual look the thumbnail of audio content the time, with the corresponding URI of the thumbnail of this selection just by specific.At this, suppose for example be " http://sv1.vod.service-a.co.jp/content001 " by specific URI.Then, STB402 obtains domain name according to the above-mentioned specific URI that goes out.In this embodiment, obtained domain name is " sv1.vod.service-a.co.jp ", then, sends and to be used to inquire with the corresponding IP of this domain name that obtains address, the DNS apply for information.Include the domain name that this is obtained in this DNS apply for information.
At this, the transmission destination of DNS apply for information is the dns server (is HGW101 at this) of acquiescence.The IP address of dns server about acquiescence, DHCP) for example can set at STB402 in advance by straighforward operation, perhaps by DHCP (Dynamic Host Configuration Protocol: general technology and obtaining by STB402 in advance such as by the user.These are not to be substantial portion of the present invention, therefore omit its explanation.
Next, the processing of HGW101 when STB402 receives the DNS apply for information is described.At this, suppose that the non-direct management of HGW101 has the corresponding IP of the domain name address that comprises in the DNS apply for information that receives with this.When this situation, HGW101 further sends the DNS apply for information (step S202) that includes above-mentioned domain name to dns server 601.As long as generally speaking, title solves is carried out repeatedly via a plurality of dns servers, still, for the purpose of simplifying the description, inquires at this imagination HGW101 to dns server 601 and just can obtain the JP address of looking audio frequency delivery server 603.In addition, in the ordinary course of things, the ISP can set up dns server, and the JP address of the own server that is provided is managed, but in the IP address of this imagination by dns server 601 management Servers-alls.
Next, the processing of dns server 601 when HGW101 receives the DNS apply for information is described.Dns server 601 stores the address with the corresponding IP of each domain name, and sends appropriate DNS answer message at the DNS apply for information.Therefore, dns server 601 includes and domain name " sv1.vod.service-a.co.jp " the corresponding IP address " 101.101.101.1 " of looking audio frequency delivery server 603, DNS answer message (step S203) to the HGW101 foldback.
HGW101 has received after the above-mentioned DNS answer message, passes on above-mentioned DNS answer message to the STB402 as inquiry side.STB402 has received after this DNS answer message, just can learn with the corresponding IP of domain name " sv1.vod.service-a.co.jp " address to be " 101.101.101.1 ", thus can be to looking audio frequency delivery server 603 request video/audios.
At this moment, as general known technology, HGW101 can add in above-mentioned DNS answer message and is called as TTL (Time To Live: value life span) is notified to STB402.TTL is the value of the valid expiration date of the IP address information that comprised of the above-mentioned DNS answer message of expression.In STB402, the information of domain name that obtains from the DNS answer message and IP address is subjected to cache handles (to call the DNS high-speed cache in the following text), in addition, and for the domain name of having been inquired, do not send its DNS apply for information once more, thereby can reduce processing expenditure.In other words, we can say that TTL is the effective time of DNS high-speed cache among the STB402.If the time limit that time no show TTL is represented, then the DNS high-speed cache is effective, so STB402 can directly visit based on the DNS high-speed cache and looks audio frequency delivery server 603.Therefore on the contrary, if the time has surpassed the represented time limit of TTL, then the DNS high-speed cache becomes invalidly, will visit when looking audio frequency delivery server 603 as STB402, need reuse the DNS apply for information and inquire the IP address.
At this, such as described later, the priority that HGW101 comes the setting data bag according to the domain name that this DNS apply for information is comprised, this is one of the principal character of the communication control unit of present embodiment.Therefore, directly audio frequency delivery server 603 is not looked in visit if STB402 does not send the DNS apply for information, just can carry out priority data described later and generate processing, thereby cause the present invention possibly can't effectively bring into play its effect.To this, in the present embodiment, the ttl value when HGW101 is sent is made as less value (for example several seconds).The value of TTL is more little, among the STB402 valid period of DNS high-speed cache just short more, therefore just can reduce the directly visit chance of looking audio frequency delivery server 603 of STB402 as far as possible.Though the value of TTL is the smaller the better, terrifically, be used once just inefficacy if set apply for information, STB402 will visit when looking audio frequency delivery server 603 so, just all will send the DNS apply for information at every turn.But then at every turn all will to HGW101 send DNS apply for information if STB402 needs connected reference to look audio frequency delivery server 603 this moment, and like this, the communication overhead of the processing expenditure of STB402 and P1C network 501 all can increase.Therefore need the communication means of corresponding STB402 to wait the value of adjusting TTL.
HGW101 generates the priority of data packets that will pass in order to expression HGW101, data (generating processing to call priority data in the following text) (step S204) after STB402 replys the DNS answer message.Carrying out priority data generates when handling, according to including the domain name that is corresponding relation and the data of priority, the corresponding with service device of generation contained domain name in the DNS apply for information, the packet that sends to the data source and sink 400 (STB402) that has sent the DNS apply for information, priority list registration certificate, then with this storage to storage part.At this, about from domain name for " sv1.vod.service-a.co.jp " look audio frequency delivery server 603 to the priority of data packets that STB402 sends, suppose that the represented priority of above-mentioned data that is generated is " 5 ".
Above-mentioned " including the domain name that is corresponding relation and the data of priority ", (following also claim " QoS object data ") was meant: in these data, about the domain name of the sender server 600 of desiring the preferential packet that transmits and in order to the value of expression priority, this domain name is mutual corresponding with this value.Therefore, for example can followingly manage: the domain name of looking audio frequency delivery server 603 is added in the above-mentioned QoS object data in advance when looking video/audio bag that audio frequency delivery server 603 sent and transmit wanting preferentially; On the other hand, when transmitting, the domain name with Web server 605 is not added in the above-mentioned QoS object data in the Web data packet that does not need preferentially Web server 605 to be sent (below, yet claim " non-QoS object ").In the present embodiment, the domain name that imagination is looked audio frequency delivery server 603 is included in the above-mentioned QoS object data, and the domain name of Web server 605 is not included in the above-mentioned QoS object data.
Therefore, the domain name that comprised of DNS apply for information can not be included in the above-mentioned QoS object data sometimes.When this situation, generate processing even carry out priority data, can not generate the data of the above-mentioned priority of data packets of expression yet.Generate the detailed content of handling about priority data, will narrate afterwards.
In packet priority change described later is handled, utilize the data that generated in the priority data generation processing in order to the expression priority of data packets, for corresponding with service device from the contained domain name of DNS apply for information, to the packet that the data source and sink 400 that has sent the DNS apply for information is sent, upgrade the value of the precedence field (DSCP) in the IP head of this packet.About the detailed content that the packet priority change is handled, will narrate afterwards.
After STB402 has received the DNS answer message, in order to begin to look the reception of audio content, to looking audio frequency delivery server 603 request video/audios (the 2nd requires) (step S205).At this, the order of above-mentioned request may follow data packet transceive repeatedly sometimes, but this is not to be substantial portion of the present invention with service or agreement and each is different to some extent, therefore omits its explanation.
After looking audio frequency delivery server 603 and receiving above-mentioned request,, send video/audio data flow (step S206) to STB402 as answer from STB402.HGW101 in the path also receives this video/audio data flow.
After HGW101 receives above-mentioned video/audio data flow, handle by packet priority change described later, priority (DSCP) value to the video/audio bag of the video/audio data flow that is subordinated to this reception is upgraded, and passes on this video/audio bag (step S207) to PLC adapter 301 then.When carrying out above-mentioned renewal, use at step S204 to generate, be " 5 ", data from domain name for the priority of data packets that audio frequency delivery server 603 sends to STB402 of looking of " sv1.vod.service-a.co.jp " in order to expression.That is, the DSCP value of video/audio bag that will belong to the video/audio data flow of above-mentioned reception is updated to " 5 ".About the detailed content that the packet priority change is handled, will narrate afterwards.
Therefore, set to such an extent that be lower than 5 packet (for example, the packet of Web data etc.) than the DSCP value, HGW101 preferentially sends above-mentioned video/audio to PLC adapter 301 (the preferential transmission).
After PLC adapter 301 has received the video/audio bag that passes on from HGW101, the video/audio bag of this reception is sent to PLC network 501.At this moment, PLC adapter 301 converts the DSCP value that extracts to corresponding to the packet priority of PLC network 501 expression value (CAP) from the video/audio bag of this reception, carry out the preferential control of packet then.If the value of DSCP is 5, according to the mapping relations shown in the table 1, then the value of corresponding CAP is 2.Therefore, be lower than 2 packet (for example, the packet of Web data etc.) than the value of CAP, PLC adapter 301 preferentially sends to PLC network 501 with the video/audio bags of above-mentioned reception.
Because the transmission destination of above-mentioned video/audio bag is STB402, therefore, PLC adapter 302 transfers to STB402 with this packet that receives after having received packet from PLC adapter 301.Because each PLC adapter has just been obtained the IP address information of the equipment that other PLC adapters are connected in advance, so when the transfer of data bag, according to IP address as the packet final destination, determine this packet the PLC adapter that should send to.PLC adapter 302 also similarly preferentially passes on above-mentioned video/audio bag to STB402 with above-mentioned.
At last, STB402 receives the video/audio bag that sends from PLC adapter 302, and converts thereof into video/audio signal (decoding), outputs to television set 405 then, thereby realizes looking the playback (step S208) of audio frequency.
Next, flow process (sequence P2) when web content that other users beyond television set 405 users are once provided Web server 605 with PC403 shows is described.
At first, when the user's operation that obtains the web content that Web server 605 provides by PC403 (for example, carry out Web browser software and show particular Web page) time, processing when receiving web content to start with (reception begin handle), PC403 sends the DNS apply for information (step S301) of the IP address that is used to inquire Web server 605 to the dns server (being HGW101 in the present embodiment) of acquiescence.At this, the processing when sending the DNS apply for information is identical with the explanation among the step S201, therefore omits its explanation.
Next, same with the flow process that illustrates in step S202, HGW101 sends the DNS apply for information (step S302) that includes above-mentioned domain name to dns server 601 after PC403 receives the DNS apply for information.
Then, same with the flow process that illustrates in step S203, dns server 601 includes the DNS answer message (step S303) of the IP address " 105.105.105.1 " of Web server 605 to the HGW101 foldback after HGW101 receives the DNS apply for information.The IP address of the dns server of acquiescence for example can be carried out keyboard operation to PC403 by the user and waited and set, and perhaps can utilize DHCP etc. to be obtained automatically by PC403.
Then, HGW101 receives after the above-mentioned DNS answer message, passes on above-mentioned DNS answer message to the PC403 of inquiry side.The PC403 that receives this DNS answer message can learn that just the IP address of Web server 605 is " 105.105.105.1 ", thereby can be to Web server 605 request Web data.
HGW101 generates processing with step S204 execution priority data in the same manner after PC403 foldback DNS answer message, to try to generate priority data (address group) (step S304).But, as mentioned above, in the present embodiment, the domain name (non-QoS object) that does not contain Web server 605 in the QoS object data, therefore, handle, also can't generate from the expression data of Web server 605 to the priority of data packets of PC403 transmission even the execution priority data generate.
On the other hand, PC403 receives after the DNS answer message, in order to begin to carry out the reception of web content, and to Web server 605 request Web data (step S305).
Then, after Web server 605 receives above-mentioned request from PC403,, send Web data flow (step S306) to PC403 as answer at this request.HGW101 on the path also receives this Web data flow.
The HGW101 that receives above-mentioned Web data flow handles by the packet priority change, and examination is upgraded (step S307) with the value of DSCP that the Web data packet in the Web data flow of this reception is comprised.But, owing in step S304, do not generate from the expression data of Web server 605 to the priority of data packets of PC403 transmission, therefore, handle even carry out the change of data packet priority, also can not upgrade priority (DSCP) value of the Web data packet in the Web data flow of above-mentioned reception.That is, the value of DSCP still remains the default value set in the Web server (for example 0).
Therefore, when HGW101 passes on above-mentioned Web data packet to PLC adapter 301, preferentially do not transmit (transmitting usually).
Then, after PLC adapter 301 receives the Web data packet of being passed on by HGW101, send these Web data packet that receive to PLC network 501.At this moment, PLC adapter 301 converts the value of the DSCP that extracts and PLC network 501 corresponding priority of data packets values (CAP) to from the Web data packet of this reception, carry out the preferential control of packet then.According to the mapping relations shown in the table 1, the value of DSCP is 0 o'clock, and the value of corresponding CAP is 1.
Then, because the transmission destination of above-mentioned Web data packet is PC403, therefore, receives the packet that the PLC adapter 302 of packet just receives this from PLC adapter 301 and transfer to PC403.
At last, PC403 receives the Web data packet that sends over from PLC adapter 302, and shows Web data (step S308).
Send video/audio bag and Web data packet by flow process according to above explanation, just can be on television set 405 audiovisual look the audio content of looking that audio frequency delivery server 603 provided, and can on PC403, show the web content that Web server 605 is provided.
At this, in Fig. 4, though sequence 1 and sequence 2 are not carried out in same sequential, sequence 1 and sequence 2 also can be carried out in same sequential.At this moment, might in the same period arrive HGW101 from the DNS apply for information of STB402 with from the DNS apply for information of PC403.In addition, look the video/audio bag of audio frequency delivery server 603 transmissions and the Web packet of Web server 605 transmissions and also might in the same period arrive HGW101.In the time of in this case, also carry out above-mentioned various processing, that is, the value of looking the DSCP of the video/audio bag that audio frequency delivery server 603 sent is updated to " 5 " by HGW101, and the value of the DSCP of the Web packet that Web server 605 is sent remains default value (0).In HGW101 and PLC adapter 302, temporary transient advanced row buffering in the time will sending packet from the packet that does not send as yet, sends from priority higher data bag then successively, therefore can transmit according to priority.This is the general method that adopts during preferential control transmits.
(structure of HGW)
Below, with reference to Fig. 1, the schematic configuration as the HGW101 of communication control unit 100 is described.Fig. 1 is the block diagram of the schematic configuration of expression HGW101.
As shown in Figure 1, HGW101 comprises control part 10, storage part 20, WAN side Department of Communication Force 31 and LAN side Department of Communication Force 32.
10 pairs of storage parts 20 of control part, WAN side Department of Communication Force 31 and LAN side Department of Communication Force 32 are controlled, and the calculation process of being scheduled to.About predetermined calculation process, reception is for example arranged from the processing of the dns address inquiry of STB402 etc.About the detailed structure of control part 10, will narrate afterwards.
Storage part 20 is used to store data that obtained behind various data that control part 10 will use and the executive program etc.Storage part 20 can by RAM (Random Access Memory: random access memory) etc. volatile memory and ROM (Read Only Memory: read-only memory) or nonvolatile memory such as flash memory realize.Above-mentioned various data are stored in the various storage parts of storage part 20 inside.Include server address storage part 21, QoS object storage portion 22 (the 1st storage part) and packet priority storage part 23 (the 2nd storage part) in the storage part 20.
Server address storage part 21 is stored " group " that domain name and IP address by server 600 are constituted to read possible form.Server address storage part 21 can have example data structure as shown in table 2 below.Table 2 is tables of the data structure example in the expression server address storage part 21.As shown in table 2, comprise the group that constitutes by " domain name " and " server ip address " in the clauses and subclauses that server address storage part 21 is stored." domain name " is the character string of the domain name of expression server 600." server ip address " is the IP address of server 600.
In server address storage part 21, also may a plurality of IP address be arranged corresponding stored with respect to 1 domain name.Its reason is, for the load of distributing server 600 or carry out data backup, creates secondary server sometimes.In the example of table 2, for example, be the IP address of the server 600 of " sv1.vod.service-a.co.jp " as domain name, store " 101.101.101.1 " and " 101.101.101.2 ".
(table 2)
Figure BPA00001248535700321
QoS object storage portion 22 to be reading possible form, to by the domain name of server 600, service name that server 600 is provided, enjoy server 600 service the time " group " that priority constituted store.QoS object storage portion 22 can have example data structure as shown in table 3 below.Table 3 is tables of the data structure example in the expression QoS object storage portion 22.As shown in table 3, the clauses and subclauses that QoS object storage portion 22 is stored have comprised by " Service name ", " domain name ", " priority " institute formation group.
" Service name " is the title of the service that provided of server 600." domain name " is the character string of the domain name of expression server 600." priority " is the preferentially value of the degree of priority of the service of enjoyment server 600 of expression, and its numerical value is big more, and represented priority is just high more.
In the example of table 3, for example,, store " 5 " of its priority value of expression for " looking audio frequency delivery service A " that the server 600 that by domain name is " * .vod.service-a.co.jp " is provided.
At this, " * " that occur in " domain name " represented character string arbitrarily.For example, " sv1.vod.service-a.co.jp " and " sv2.vod.service-a.co.jp " all belongs in the expression scope of " * .vod.service-a.co.jp ".Therefore, provide the domain name of the server 600 of " looking audio frequency delivery service A " in the example can be " sv1.vod.service-a.cojp " reach " sv2.vod.service-a.co.jp " wherein any one.Furthermore, record and narrate domain name if adopt the expression way of " * .vod.service-a.co.jp " in advance, even set up domain name so later on for example is the server 600 of " sv3.vod.service-a.co.jp ", does not also need the clauses and subclauses in the QoS object storage portion 22 are upgraded.Equally, " vod*.service-d.com " this expression way has contained " vod001.service-d.com " or domain names such as " vod002.service-d.com ".About the narration way of domain name, can adopt general regular description method.For example, in general regular record, can (for example, Roman capitals or numeral or mark) any character be recorded and narrated, and maybe can record and narrate into the arbitrary string of specific character number to particular types.
At this, about each clauses and subclauses in the QoS object storage portion 22, for example when dispatching from the factory, each service that can provide by 600 of each servers, these clauses and subclauses of storage in advance in HGW101.In addition, set any of picture 161 and 162 by utilizing QoS object described later, the user can also upgrade each clauses and subclauses in the QoS object storage portion 22.In addition, also can on the position that can communicate with HGW101, be provided for the information of each clauses and subclauses in the QoS object storage portion 22 is offered the server (being referred to as QoS object information server) of HGW101.HGW101 can visit above-mentioned QoS object information server, to obtain information as required.For example, can when start HGW101 at every turn, all visit QoS object information server and obtain information, before perhaps each each clauses and subclauses in HGW101 use QoS object storage portion 22, all visit QoS object information server and obtain information.
(table 3)
Service name Domain name Priority
Look audio frequency delivery service A *.vod.service-a.co.jp 5
Look audio frequency delivery service B service-b.co.jp 1
Look audio frequency delivery service C vod1.service-c.ne.jp 4
Look audio frequency delivery service C vod2.service-c.ne.jp 4
Look audio frequency delivery service C vod3.service-c.ne.jp 4
Look audio frequency delivery service D vod*.service-d.com 1
About send to from server 600 data source and sink 400 by the packet that HGW101 passed on, packet priority storage part 23 is stored to read possible mode being given to this priority of data packets.Packet priority storage part 23 for example can have the data structure shown in the following table 4.Table 4 is tables of the data structure example in the expression packet priority storage part 23.As shown in table 4, the clauses and subclauses that packet priority storage part 23 is stored have comprised " group " that is made of " domain name ", " server ip address ", " client IP address ", " priority ", " the final time on date that receives ".
" domain name " is that the transmit leg of the expression packet that HGW101 passed on is the character string of the domain name of server 600.Same with the data structure in the QoS object storage portion 22, can perhaps record and narrate " domain name " by containing the expression way of " * " by general regular narration way." server ip address " is that the transmit leg of the above-mentioned packet that is passed on is the IP address of server 600." client IP address " is that the transmission destination of the above-mentioned packet that is passed on is the IP address of data source and sink 400.The value of the degree of priority when " priority " is the preferential transfer data packets of expression, its numerical value is big more, and represented priority is just high more." final receive time on date " is the date time of HGW101 when receiving the above-mentioned packet that is passed on for the last time.
In the example of table 4, for example storing following information item: about server 600 (the IP address can be any one " 101.101.101.1 ", " 101.101.101.2 ", " 101.101.101.3 ", " 101.101.101.4 ") from matching with " * .vod.service-a.co.jp " this expression way, transmission is the packet of the data source and sink 400 of " 192.168.0.2 " to the IP address, and the priority that this packet was endowed is " 5 "; The time on date that HGW101 receives this packet for the last time is " 16: 19: 20 on the 15th April in 2008 ".
In addition, if the IP address of data source and sink 400 is to pay by DHCP, the IP address of this data source and sink 400 may be changed so, therefore can further add the MAC Address (address) of data source and sink 400 and store in packet priority storage part 23.In addition, MAC Address about data source and sink 400, for example can be between HGW101 and data source and sink 400 address resolution protocol) etc. follow ARP (Address Resolution Protocal: obtain in the conversation procedure of agreement, but this is not to be substantial portion of the present invention, therefore omits its explanation.
(table 4)
Figure BPA00001248535700351
At this, storage part 20 and not requiring must be arranged among the HGW101, and storage part 20 also can be used as external memory, is connected with HGW101 in the mode that can be read.
WAN side Department of Communication Force 31 is in order to communicate via the Internet 701 and server 600.
LAN side Department of Communication Force 32 portion within it includes ethernet communication portion 33 (packet maintenance/issue unit), and ethernet communication portion 33 is communicated with the device that this ethernet communication portion 33 is connected by Ethernet with Jie.In the present embodiment, ethernet communication portion 33 communicates with PLC adapter 301.
In addition, as shown in the figure, LAN side Department of Communication Force 32 can also further comprise WLAN Department of Communication Force 34.WLAN Department of Communication Force 34 is communicated with the device that this WLAN Department of Communication Force 34 is connected by WLAN with Jie.
Next, describe control part 10 in detail.Control part 10 comprises packet and passes on handling part 11 (packet forward control unit), DNS handling part 12 (domain name/address extraction unit), priority data generates handling part 13, and (domain name priority obtains the unit, the unit is obtained in the address, the priority data generation unit), packet priority change handling part 14 (sender address/transmission destination-address extraction unit, packet priority obtains the unit, packet priority level initializing unit, the preferential delivery unit of packet), priority data is eliminated handling part 15 (prior information elimination unit), the QoS object sets handling part 16 (QoS object setup unit) and the QoS object upgrades handling part 17.
At first, passing on handling part 11 with regard to packet describes.Packet passes on handling part 11 and at first analyzes: whether WAN side Department of Communication Force 31 the be situated between transmission destination of the packet that received from data source and sink 400 by PLC adapter 301 of the destination of the packet that received from server 600 by the Internet 701 and LAN side Department of Communication Force 32 that is situated between is HGW101.
If the result of above-mentioned analysis is not to be HGW101 for the transmission destination of the above-mentioned packet that receives, packet passes on handling part 11 just makes 14 pairs of packet priority change handling parts become to pass on the priority of data packets of object to change processing.Then, the priority of data-driven bag is passed on the transmission of packet of object and is controlled above-mentioned becoming, and above-mentioned becoming passed on the packet of object and pass on processing (packet sending controling unit).About packet priority change handling part 14, will illustrate afterwards.
In passing on of packet handled, it is that the packet of data source and sink 400 is transferred to LAN side Department of Communication Force 32 earlier from the destination that server 600 receives that WAN side Department of Communication Force 31 is situated between by the Internet 701, is situated between then to be sent to data source and sink 400 by PLC adapter 301.In addition, on the contrary it is that the packet of server 600 is transferred to WAN side Department of Communication Force 31 earlier from the destination that data source and sink 400 receives that LAN side Department of Communication Force 32 is situated between by PLC adapter 301, is sent to server 600 then.At this, when carrying out above-mentioned passing on, generally carry out NAT (Network Address Translation: network address translation) handle or NAPT (Network Address Port Translation: network port address transition) handle.But this is not to be substantial portion of the present invention, therefore omits its explanation.
In addition, if the result of above-mentioned analysis is HGW101 for the transmission destination of the above-mentioned packet that receives, whether packet just further to analyze this packet be the packet of DNS apply for information or the packet of DNS answer message if passing on handling part 11.If this packet is the packet of DNS apply for information or the packet of DNS answer message, just make DNS handling part 12 carry out follow-up processing.
And, packet pass on handling part 11 receive from data source and sink 400 require to provide QoS object described later set picture 161 and 162 any one, during packet, make the QoS object set handling part 16 and carry out follow-up processing.
In addition, packet passes on handling part 11 and requires visit update service device 602 receiving from data source and sink 400, during packet, makes the QoS object upgrade handling part 17 and carries out follow-up processing.
Next DNS handling part 12 is described.DNS handling part 12 carries out the general processing relevant with DNS.If it is the packet of the DNS apply for information that sent by data source and sink 400 that packet passes on packet that handling part 11 received, DNS handling part 12 at first extracts the domain name of the inquiry object apparatus that comprises in this DNS apply for information and the IP address of data source and sink 400 (domain name/address extraction unit).Then, whether storing the clauses and subclauses of the domain name that includes this extraction in the retrieval server address storage part 21.
If the result of above-mentioned retrieval is, storing the clauses and subclauses that comprised above-mentioned domain name in the server address storage part 21, DNS handling part 12 is just obtained the address with the corresponding IP of above-mentioned domain name from server address storage part 21, and be situated between by packet pass on handling part 11 to the transmit leg of above-mentioned DNS apply for information promptly, data source and sink 400 foldbacks include the DNS answer message of this IP address of obtaining.
On the contrary, if the result of above-mentioned retrieval is, do not store the clauses and subclauses that comprised above-mentioned domain name in the server address storage part 21, DNS handling part 12 just is situated between and passes on handling part 11 by packet and send the new DNS apply for information that contains above-mentioned domain name to dns server 601.Then, DNS handling part 12 is situated between and is passed on after handling part 11 receives DNS answer message at above-mentioned new DNS apply for information from dns server 601 by packet, the group of being formed by domain name in this DNS answer message and IP address, store in the server address storage part 21, and Jie is passed on by packet, and handling part 11 to the transmit leg of DNS apply for information is, this DNS answer message of data source and sink 400 foldbacks.
At this, when DNS handling part 12 receives the DNS answer message from dns server 601, also obtain the TTL that is comprised in this DNS answer message.When the elapsed time when receiving the DNS answer message surpassed the above-mentioned TTL that obtains represented during the time, just eliminate the group of being formed by domain name in this DNS answer message and IP address of storage in the server address storage part 21.Though in the transmit leg of DNS apply for information is the DNS answer message of data source and sink 400 foldbacks, also comprise ttl value, but this ttl value be with respect to the ttl value of obtaining from dns server 601 the value of independent decision, and, for the DNS high-speed cache in the data source and sink 400 is eliminated as early as possible, this ttl value is set lessly.
Next, illustrate that priority data generates handling part 13.Priority data generates handling part 13 and is used to carry out priority data generation processing.DNS handling part 12 is after data source and sink 400 has sent the DNS answer message to the transmit leg of DNS apply for information, and priority data generates handling part 13 and as required data packet priority storage part 23 upgraded.
Be specially, priority data generates handling part 13 and at first all clauses and subclauses in the QoS object storage portion 22 is retrieved, and it is corresponding to therefrom to extract the domain name of the value that satisfies " domain name " row (column) and the inquiry object apparatus in the DNS apply for information, clauses and subclauses.At this moment, as fail to extract clauses and subclauses, the server 600 that then means data source and sink 400 desires visits (promptly, the server 600 that has domain name contained in the DNS apply for information) service that is provided is not that QoS object storage portion 22 manages (promptly, be not set priority) service, therefore need not the priority of data packets that above-mentioned server 600 sends is upgraded.Therefore, this moment, priority data generated handling part 13 its processing of end.
On the other hand, as if the corresponding to clauses and subclauses of domain name of inquiry object apparatus contained in the value of extracting satisfied " domain name " row from QoS object storage portion 22 and the DNS apply for information, the value of just selecting " priority " row from the clauses and subclauses that this extracts is maximum priority.Then, by with reference to " priority " row, obtain the priority (domain name priority obtains the unit) of the service that the server 600 (that is the server 600 that, has domain name contained in the DNS apply for information) of data source and sink 400 desires visits provided.
Next, all clauses and subclauses that priority generates in 13 pairs of server address storage parts 21 of handling part are retrieved, to extract from server address storage part 21: the value of the value of " domain name " row and above-mentioned " domain name " row from the clauses and subclauses that QoS object storage portion 22 extracts is corresponding to, clauses and subclauses.Then, by with reference to " server ip address " in the clauses and subclauses of this extraction row, obtain the IP address (unit is obtained in the address) of the server 600 (that is the server 600 that, has domain name contained in the DNS apply for information) of data source and sink 400 desires visit.Satisfy above-mentioned situation if any a plurality of IP address, then all obtain.
Then, priority generates handling part 13 and uses above-mentioned priority that obtains and the above-mentioned IP address of obtaining, and data packet priority storage part 23 is upgraded (priority data generation unit).Promptly, in the clauses and subclauses that are created on packet priority storage part 23, what " domain name " tabulation was shown is above-mentioned domain name from the clauses and subclauses that QoS object storage portion 22 extracts, what " server ip address " tabulation was shown is the above-mentioned IP address that must get from server address storage part 21, what " client IP address " tabulation was shown is that DNS handling part 12 extracts, sent the IP address of the data source and sink 400 of DNS apply for information, what " priority " tabulation was shown is the above-mentioned priority that must get from QoS object storage portion 22, and that " final date received time " tabulation is shown is null value (NULL).At this, final date received time " value of row also can be current system time.In addition, if must get a plurality of IP address, just the clauses and subclauses of corresponding generation also are a plurality of from server address storage part 21.
If it is too much to become the data flow of QoS transmission object, lose the effectiveness of QoS sometimes.As the explanation of carrying out according to Figure 14 and Figure 15, all bandwidth of network have been surpassed if become the data flow of the object that QoS transmits, just all data flow can be looked the audio frequency disorder because of bandwidth is not enough.In order to prevent the problems referred to above, need and will accept or reject, that is, a side data flow as the QoS transmission object, and is got rid of other data flow outside the object that QoS transmits.In the present invention, QoS to as if distinguish according to domain name, but in home network if exist a plurality of servers to come the terminal of receiving data stream from the same domain name of correspondence, these data flow just can have identical priority, therefore are necessary to accept or reject therein.
For this reason, can consider the quantity of the data flow that becomes the QoS object is limited.For example can carry out following control: from the initial territory of visiting as the QoS object, sequencing by visit is determined QoS object (generation priority data), and will exceed the data flow eliminating that limits to a number or amount outside QoS object (not generating priority data).About the limit number of data flow, can when dispatching from the factory, be stored in advance among the HGW101, also can set picture 161 or 162 by the QoS object and set by the user.
In addition, HGW101 also can be on the basis of the behaviour in service of the transfer rate of having grasped QoS object data stream and the network bandwidth, the limit number of decision QoS object data stream.For example, be 25Mbps at the capacity of the not utilized bandwidth of network, when the transfer rate of QoS object data stream is the situation of 10Mbps, if at most with 2 data flow as the QoS object, then be unlikely to take place the bandwidth deficiency, also can not lose the effectiveness of QoS.About how learning in the network the not size of utilized bandwidth, for example can inquire the device that constitutes this network.For example, can inquire to PLC adapter 301 grades, thereby obtain the bandwidth behaviour in service of PLC network 501 by HGW101.In addition,, for example can inquire, or inquiring to STB402 to looking audio frequency delivery server 603 about how learning the transfer rate of QoS object data stream, or to looking that the negotiation packet of receiving and dispatching between audio frequency delivery server 603 and the STB402 is analyzed etc.
In addition, in the present invention, can grasp QoS object data stream in advance is the data flow of corresponding which service, therefore, (for example also can in HGW101, store maximum transfer rate that utilization regulation with this service etc. determined in advance, when product export, store transfer rates in QoS object storage portion 22) by each service.
In addition, if the user sets picture 161 by QoS object described later, qos feature described later is set at " stopping ", priority data generation handling part 13 does not just carry out the priority data generation to be handled, and end process.
At this,, generate the priority data generation processing that handling part 13 is carried out with concrete example explanation priority data with reference to table 2, table 3 and table 4.
For example, suppose to have stored in the server address storage part 21 data shown in the table 2, stored the data shown in the table 3 in the QoS object storage portion 22.In addition, supposing that DNS handling part 12 sends for the data source and sink 400 of " 192.168.0.2 " secondary IP address, serve as that the DNS apply for information of inquiring object is handled with domain name " sv2.vod.service-a.co.jp ".
In this case, as mentioned above, priority data generates handling part 13 and at first extract the clauses and subclauses that contain domain name " sv2.vod.service-a.co.jp " from QoS object storage portion 22.Character string " sv2.vod.service-a.co.jp " belongs in " * .vod.service-a.co.jp " this expression scope.Therefore, the value of " Service name " row is extracted out for the clauses and subclauses of " looking audio frequency delivery service A ", learns that thus priority is " 5 ".
Next, priority data generates handling part 13 and extract the clauses and subclauses that contain domain name " * .vod.service-a.co.jp " from server address storage part 21.Therefore, in the server address storage part 21, the clauses and subclauses that the value of " Service name " row is the clauses and subclauses of " sv1.vod.service-a.co.jp " and is " sv2.vod.service-a.co.jp " are extracted out, learn that thus server ip address is " 101.101.101.1 ", " 101.101.101.2 ", " 101.101.101.3 " and " 101.101.101.4 ".
Then, priority data generates handling part 13 according to the above-mentioned domain name that obtains from QoS object storage portion 22 and priority and the above-mentioned server ip address that obtains from server storage section 21, generates the packet priority data shown in the table 4.That is, generate each following clauses and subclauses respectively: domain name is " * .vod.service-a.co.jp ", and server ip address is " 101.101.101.1 ", and client IP address is " 192.168.0.2 ", and priority is the clauses and subclauses of " 5 "; Domain name is " * .vod.service-a.co.jp ", and server ip address is " 101.101.101.2 ", and client IP address is " 192.168.0.2 ", and priority is the clauses and subclauses of " 5 "; Domain name is " * .vod.service-a.co.jp ", and server ip address is " 101.101.101.3 ", and client IP address is " 192.168.0.2 ", and priority is the clauses and subclauses of " 5 "; Domain name is " * .vod.service-a.co.jp ", and server ip address is " 101.101.101.4 ", and client IP address is that " 192.168.0.2 ", priority are the clauses and subclauses of " 5 ".
Below data packet priority change handling part 14 is described.Packet priority change handling part 14 is handled in order to carry out the packet priority change.The packet that 14 pairs of data packet transfers of packet priority change handling part handling part 11 is desired to pass on is analyzed, and based on the clauses and subclauses of storing in the packet priority storage part 23, the priority of data packets to analyzed mistake changes as required.
Be specially, packet priority change handling part 14 at first extracts transmit leg IP address and sends IP address, destination (sender address/transmission destination-address extraction unit) from the packet of preparing to pass on.
Then, from the clauses and subclauses of packet priority storage part 23, the value of extracting " server ip address " row is consistent with the transmit leg IP address of said extracted, and the IP address, transmission destination of value of " client IP address " row and said extracted is corresponding to, clauses and subclauses.
At this moment, if fail to extract above-mentioned clauses and subclauses, mean that then the packet that above-mentioned preparation is passed on not is to be the object that carries out priority change, therefore, packet priority change handling part 14 finishes its processing.Then, packet priority change handling part 14 makes packet pass on handling part 11 to handle and pass on the packet that above-mentioned preparation passes on.
On the contrary, if extracted above-mentioned clauses and subclauses, can learn that the above-mentioned packet of desiring to pass on is the object that carries out priority change.Therefore, packet priority change handling part 14 is obtained the value (packet priority obtains the unit) of " priority " row in the clauses and subclauses of said extracted.Then, with this value that obtains, the priority of data packets field (being dscp field) that above-mentioned preparation is passed on is carried out overwrite (packet priority level initializing unit).
At this, if extract a plurality of above-mentioned clauses and subclauses, the priority of data packets field (being dscp field) of coming the above-mentioned preparation of overwrite to pass on just with the maximum among the value of " priority " of these clauses and subclauses row.
In addition, when having extracted above-mentioned clauses and subclauses, the time on date when becoming HGW101 to receive the packet that above-mentioned preparation passes on the value overwrite of " final date received time " in the clauses and subclauses of said extracted row.At this, also can not store the date received time, and the date time of storage HGW101 when sending packet.
Afterwards, packet priority change handling part 14 make packet pass on handling part 11 handle pass on above-mentioned by overwrite the packet of precedence field.
At this, when setting the qos feature of aftermentioned information for " stopping " as if the user by QoS object setting picture 161 described later, packet priority change handling part 14 does not just carry out the packet priority change to be handled, and finishes its processing.
At this,, handle with the packet priority change that concrete example explanation packet priority change handling part 14 is carried out with reference to table 4.
For example, store the data shown in the table 4 in the tentation data packet priority storage part 23.And suppose that secondary IP address has sent video/audio bag to the IP address for the data source and sink 400 of " 192.168.0.2 " for the audio frequency delivery server 603 of looking of " 101.101.101.1 ".
At this moment, packet passes on handling part 11 and prepares to pass on above-mentioned video/audio bag to LAN side Department of Communication Force 32.Carrying out before this passes on, packet priority change handling part 14 is by the clauses and subclauses in the contrasting data packet priority storage part 23, the value of seeking and extract " server ip address " row be " 101.101.101.1 ", and " client IP address " value of being listed as is " 192.168.0.2 ", clauses and subclauses.Then, by with reference to " priority " in the clauses and subclauses of being extracted row, learn that priority is " 5 ".
Then, packet priority change handling part 14 becomes " 5 " with the dscp field overwrite of above-mentioned video/audio bag.
By above-mentioned processing, consequently,, preferentially transmit above-mentioned video/audio bag than the packet of priority value less than " 5 ".
Next priority data being eliminated handling part 15 describes.Priority data is eliminated handling part 15 according to the predetermined cycle (for example per 1 minute), retrieve data packet priority storage part 23, and eliminate degree of needs step-down clauses and subclauses.
Be specially, according to the predetermined cycle (for example per 1 minute), data packet priority storage part 23 is retrieved, and from packet priority storage part 23, to the value of " final date received time " row is that all clauses and subclauses of (for example, 5 minutes before) are eliminated before the scheduled time of current system time.
At this, the reason of eliminating the clauses and subclauses in the packet priority storage part 23 as described above is: when packet priority change handling part 14 is handled, be as searching object with all clauses and subclauses in the packet priority storage part 23, therefore, the clauses and subclauses of depositing in the packet priority storage part 23 are few more, the processing burden in the time of just alleviating packet priority change handling part 14 more and retrieve.Therefore, the packet that has surpassed the scheduled time (the 2nd scheduled period) for time of non-accepting state, be considered as finishing transmitting, and from packet priority storage part 23, eliminate and the corresponding clauses and subclauses of this packet, thereby can reduce packet priority change handling part 14 handled object entry.
At this, preferably the above-mentioned scheduled time is set longer than the time limit shown in the TTL that sends to above-mentioned data source and sink 400.It is the reasons are as follows.If before the time limit shown in the TTL, owing to still have the DNS high-speed cache among the STB402, so be directly to conduct interviews to looking audio frequency delivery server 603.At this moment, because the DNS apply for information can not be sent to HGW101, therefore, about from looking audio frequency delivery server 603, can in packet priority storage part 23, not generate in order to give the clauses and subclauses of necessary priority to this packet as described above to the packet that STB402 sends.And if the above-mentioned scheduled time is shorter than the time limit shown in the TTL, so about from looking audio frequency delivery server 603 to the packet that STB402 sends, may from packet priority storage part 23, be eliminated in order to the clauses and subclauses of giving necessary priority to this packet.Therefore, when this situation, HGW101 can't change from looking the priority of data packets that audio frequency delivery server 603 sends to STB402.To this, the above-mentioned scheduled time is set for longer than the time limit shown in the TTL, just can prevent above phenomenon.In other words, adjust the above-mentioned scheduled time, make that the priority change among the HGW101 is not handled and can just be finished in the duration of existence of DNS high-speed cache.
Next the QoS object being set handling part 16 describes.The QoS object is set handling part 16 and is situated between according to it and passes on the request that handling part 11 receives from data source and sink 400 by packet, send to data source and sink 400 and (for example to be used to constitute tentation data that the QoS object sets picture 161 or 162, html data), the QoS object is set picture 161 or 162 as user interface, is used to the data of storage in QoS object storage portion 22 and the packet priority storage part 23 are upgraded.That is, QoS object setting handling part 16 has the function of general Web server.At this, set picture 161 and 162 by the QoS object, the user of data source and sink 400 can carry out the various settings that relevant priority data generates processing and the processing of packet priority change to HGW101.Set picture 161 and 162 about the QoS object, will illustrate afterwards.
Then, the QoS object is set handling part 16 and is set the content of operation that picture 161 is imported according to the user by data source and sink 400 by the QoS object, and the data of storage in the QoS object storage portion 22 are upgraded.In addition, according to setting the content of operation that picture 162 is imported by the user of data source and sink 400 by the QoS object, the data that both are stored to any one or this of QoS object storage portion 22 and packet priority storage part 23 are upgraded.Upgrade to handle about this, illustrate that afterwards the QoS object sets picture 161 and at 162 o'clock, will describe in the lump.When being necessary also the demonstration of QoS object setting picture 161 or QoS object setting picture 162 to be upgraded when following above-mentioned renewal to handle, the tentation data (for example, html data) that constitutes QoS object setting picture 161 and 162 just can be sent to data source and sink 400.
In addition, the QoS object is set handling part 16 and is upgraded handling part 17 has generated new clauses and subclauses in QoS object storage portion 22 this notice according to the QoS object, the tentation data that constitutes QoS object setting picture 161 and QoS object setting picture 162 (for example, html data) sends to data source and sink 400, set picture 161 and QoS object and set wherein one or this both demonstration of picture 162 to upgrade the QoS object.
Below explanation QoS object upgrades handling part 17.The QoS object upgrades handling part 17 and is situated between and passes on handling part 11 by packet and communicate with update service device 602, and obtains the data (the specifically group of being made up of Service name, domain name and priority) that are used for QoS object storage portion 22 is appended new clauses and subclauses from update service device 602.Be not particularly limited for carrying out this timing that obtains processing (timing).For example, the QoS object upgrades handling part 17 can visit update service device 602 according to predetermined period, thereby obtains above-mentioned data.Also can receive from data source and sink 400, when the user has set picture 161 and 162 and carried out this notice of scheduled operation by the QoS object, visit update service device 602 as initiation, and obtain above-mentioned data.
Then, according to the above-mentioned data that obtain, the QoS object upgrades handling part 17 and generate new clauses and subclauses in QoS object storage portion 22, and has generated above-mentioned new clauses and subclauses to QoS object setting handling part 16 notices at this moment.
Upgrade the processing of handling part 17 about the QoS object, illustrate that afterwards the QoS object sets picture 161 and at 162 o'clock, also will describe in the lump.
(about the structure of PLC adapter)
Next, the schematic configuration of the PLC adapter 301 (302,303) as relay 300 is described with reference to Fig. 5.Fig. 5 is the block diagram of the schematic configuration of expression PLC adapter 301 (302,303).
As shown in Figure 5, PLC adapter 301 (302,303) comprises control part 110, ethernet communication portion 131 and plc communication portion 132.
Ethernet communication portion 131 communicates with the external device (ED) that is connected with this ethernet communication portion 131 by Ethernet that is situated between.In the present embodiment, the ethernet communication portion 131 and the HGW101 of PLC adapter 301 communicate, the ethernet communication portion 131 of PLC adapter 302 and STB402 and PC403 communicate, and the ethernet communication portion 131 and the STB404 of PLC adapter 303 communicate.
Other PLC adapters on plc communication portion 132 and the PLC network 501 communicate.
110 pairs of ethernet communication portions 131 of control part and plc communication portion 132 control, and the calculation process of being scheduled to.Include QoS handling part 111 in the control part 110.
QoS handling part 111 convert the packet that can transmit on PLC network 501, and the packet after will changing sends to plc communication portion 132 to the packet that is dealt into ethernet communication portion 131 from by the Ethernet continuous external device (ED) of being situated between.In addition, the packet that is dealt into plc communication portion 132 from PLC network 501, convert to and can upwards give an account of the packet that the external device (ED) that connected by Ethernet transmits, and the packet after will changing sends to ethernet communication portion 131.
At this moment, QoS handling part 111 is preferentially controlled according to priority of data packets.That is: as mentioned above,, carry out the conversion process between DSCP and CAP according to the mapping relations shown in the table 1; For the IP packet, then preferentially control according to the value of DSCP; In addition, for the packet that on the PLC network, transmits, then preferentially control according to the value of CAP.At this, the information of imagining above-mentioned mapping relations has been stored in the not shown storage part when product export.
At this, QoS handling part 111 not only to the packet that sends to data source and sink 400 from server 600 (for example, video/audio bag etc.) preferentially control, can also be to packet (for example, the ACK (Acknowledge that sends to server 600 from data source and sink 400; Confirm to answer) etc.) also preferentially control.For example, the data packet that imagination server 600 sends to data source and sink 400, and received ACK at this data packet from data source and sink 400, the transmission that begins to carry out next data packet is thus handled.If this moment, postponing appearred in the transmission of ACK,, consequently cause to realize sometimes QoS (packet of data source and sink 400 receives and postpones) just the transmission of data packet begins and can postpone.In order to address this problem, preferably as the ack msg bag, to also preferentially controlling to the packet that server 600 sends from data source and sink 400.
In general PLC adapter, can set and whether will preferentially control according to priority of data packets.In the present embodiment, suppose to have set for according to priority of data packets in advance preferentially to control.
(handling process when HGW receives packet)
Below, the summary of the handling process of HGW101 when receiving packet is described with reference to Fig. 6.Fig. 6 is the outline flowchart of the handling process of expression HGW101 when receiving packet.
At first, after HGW101 starts, enter the wait state (step S501) that packet receives immediately.Then, if packet passes on handling part 11 and has received packet (in step S501 for "Yes"), just analyze whether the transmission destination of this packet that receives is HGW101 (step S502).
If the result of above-mentioned analysis is the transmission destination of the above-mentioned packet that receives not is to be HGW101 (being "No" in step S502), and packet priority change handling part 14 just carries out priority change and handles (step S503).Flow process about the packet priority change is handled will describe with reference to other flow charts afterwards.
What afterwards, packet passed on that handling part 11 carries out above-mentioned packet passes on processing (step S504).That is, be transferred to LAN side Department of Communication Force 32 by the Internet 701 from server 600 packets that receive, that the destination is data source and sink 400 with being situated between.Otherwise, be transferred to WAN side Department of Communication Force 31 by PLC network 501 from data source and sink 400 packets that receive, that the destination is server 600 with being situated between.
On the other hand, if the result of above-mentioned analysis is the destination of the above-mentioned packet that receives is HGW101 (being "Yes" in step S502), whether packet just to analyze this packet be the packet of DNS apply for information if passing on handling part 11, or be not the packet (to call the DNS packet in the following text) (step S505) of DNS answer message.
If this packet is DNS packet (being "Yes" in step S505), as described above, carries out the generality relevant by DNS handling part 12 and handle (step S506) with DNS.That is, as required, carry out the negotiation with dns server 601, thereby finally send the DNS answer message to the transmit leg of DNS apply for information.
The DNS answer message is sent to after the transmit leg of DNS apply for information, and priority data generates handling part 13 and carries out priority data generation processing (step S507).Generate the flow process of handling about priority data, will use other flow charts to describe afterwards.
In step S505, if learn that received packet is not is DNS packet (being "No" in step S505), just carry out handling (step S508) accordingly with this packet that receives.
In this flow chart, omitted packet and passed on handling part 11 and receive and be used to ask to provide the QoS object to set the packet of picture 161 and 162 and be used to ask to 60 visits of update service device, the handling process of packet.In addition, also omitted the processing data packets that has nothing to do with the present invention.
(priority data generates the flow process of handling)
Next, with reference to Fig. 7, illustrate that the priority data that priority data generation handling part 13 is carried out generates the flow process summary of handling.Fig. 7 is that the expression priority data generates the flow chart that priority data that handling part 13 carried out generates the flow process summary of handling.
At first, when DNS handling part 12 passes on handling part 11 by packet, pass on the transmit leg of the DNS apply for information that handling part 11 received when sending corresponding DNS answer message (being "Yes" in step S701) to packet, all clauses and subclauses that priority data generates in 13 pairs of QoS object storage of handling part portion 22 are retrieved, device domain name with the contained inquiry object of the value of extracting " domain name " row and above-mentioned DNS apply for information is corresponding to, clauses and subclauses (step S702).
At this, if the DNS apply for information includes the domain name (in other words, by a DNS apply for information a plurality of domain names being inquired) of the device of a plurality of inquiry objects, just inquire the domain name of the device of object with regard to each, carry out the processing of following S702～S707 respectively.
In addition, if above-mentioned clauses and subclauses are extracted out (be "Yes") in step S703, the value of just selecting " priority " row among the clauses and subclauses of this extraction is maximum, clauses and subclauses (step S704).If be set differently with the domain name corresponding priorities, as long as adopt the highest priority, just can satisfy the condition of all clauses and subclauses, therefore institute is selecteed is the clauses and subclauses that priority is maximum.In addition, also can select minimum priority.
Then, all clauses and subclauses that priority data generates in 13 pairs of server address storage parts 21 of handling part are retrieved, to extract from server address storage part 21: the value of " domain name " row is corresponding to, clauses and subclauses with above-mentioned " domain name " train value from the clauses and subclauses of QoS object storage portion 22 extractions.(step S705).
If extract above-mentioned clauses and subclauses (being "Yes") in step S706, priority data generates handling part 13 and just generate following clauses and subclauses (step S707) in packet priority storage part 23, that is: the value of " domain name " row is the domain names among the clauses and subclauses of obtaining among the step S704; The value of " server ip address " row is the IP addresses among the clauses and subclauses of obtaining among the step S705; The value of " client IP address " row is the IP addresses that sent the data source and sink 400 of DNS apply for information; The value of " priority " row is the priority among the clauses and subclauses of obtaining among the step S704; " final date received time " value of row is null value (NULL)." final date received time " value of row also can be current system time.In addition, in step S705,, just correspondingly generate a plurality of above-mentioned clauses and subclauses that are generated if extract a plurality of clauses and subclauses.
If in step S703, fail to extract clauses and subclauses (in step S703, being "No"), perhaps, in step S706, fail to extract clauses and subclauses (in step S706, being "No"), priority data generates handling part 13 constipation bundles and handles.
(flow process that the packet priority change is handled)
Below, with reference to Fig. 8, the general flow of the packet priority change processing that packet priority change handling part 14 is carried out is described.Fig. 8 is the flow chart of the general flow handled of packet priority change that expression packet priority change handling part 14 is carried out.
At first, packet priority change handling part 14 extracts packets and passes in the packet that handling part 11 prepares to pass on the IP address (step S901) of the IP address of transmit leg and transmission destination.
Then, all clauses and subclauses in 14 pairs of data packet priorities of packet priority change handling part storage part 23 are retrieved, to extract: the value of " server ip address " row is consistent with the transmit leg IP address of the packet that above-mentioned preparation is passed on, and the IP address, transmission destination of the packet that value of " client IP address " row and above-mentioned preparation are passed on is corresponding to, clauses and subclauses (step S902).If there are a plurality of above-mentioned clauses and subclauses, then all extract.
If extracted above-mentioned clauses and subclauses (being "Yes" in step S903), the value that packet priority change handling part 14 just among these clauses and subclauses of extracting, is selected " priority " row is maximum clauses and subclauses (step S904).Even the priority of corresponding certain IP address is set differently, as long as adopt the highest priority, just can satisfy the condition of all clauses and subclauses, therefore institute is selecteed is the clauses and subclauses that priority is maximum.In addition, also can select minimum priority.
Then, packet priority change handling part 14 is updated to the priority of data packets field (that is dscp field) of preparing to pass on the value of " priority " row in the above-mentioned selected clauses and subclauses.
In addition, if do not extract clauses and subclauses (being "No" in step S903) in step S903, packet priority change handling part 14 constipation bundles are handled.
(simple and easy version QoS object is set picture)
Next, with reference to Fig. 9 and Figure 10, QoS object setting picture 161 and 162 is described.At first, Fig. 9 is the ideograph that the simple and easy version of expression QoS object is set the picture example of picture 161, set in picture 161 at this simple and easy version QoS object, the project that can set less.
Key frame is set handling part 16 by the QoS object that possesses general Web server function and is provided according to the request from data source and sink 400, and the user of data source and sink 400 visits key frame by Web browser.At this, method about the visit key frame, for example can go up and set the link that is used to jump into key frame, also can on Web browser, directly import the URL of key frame by the user at the related setting picture (the setting picture of general router) of the root functionality of HGW101 etc.
As shown in the figure, be provided with on key frame: (1) can be convenient to the input area N1 that the user starts or stops qos feature; (2) can be convenient to the user and select whether preferentially to enjoy the input area N2 that looks the audio frequency delivery service that provides by server 600.At this, imagination input area N1 and N2 are drop-down menu or list box etc., but this is not particularly limited.
At this, above-mentioned " qos feature " is meant that the priority data that HGW101 carries out generates processing and the processing of packet priority change, when qos feature is set to " startup ", HGW101 carries out priority data and generates processing and the processing of packet priority change, and when qos feature was set to " stopping ", HGW101 did not then carry out priority data and generates processing and the processing of packet priority change.If handle because of the device beyond the HGW101 has carried out certain QoS, can not normally utilize simultaneously and cause those processing and QoS of the present invention to handle, can set qos feature for " stopping " this moment.For example, when server 600 has been paid the DSCP value and has been sent packet, if the DSCP value is updated in HGW101, just may take place undesired.
In addition, be to start or stop about qos feature, this item is stored by storage part 20.When QoS object setting handling part 16 provided key frame, reading qos feature from storage part 20 was to start or this item that stops, and the result is read in demonstration on the N1 of input area.
In addition, be to start or the opportunity that this item that stops to be stored about 20 pairs of qos features of storage part, can be when input area N1 has been subjected to input, also can key frame bottom " decision " key B3 clicked the time.
In addition, be set to when stopping, also can impose control the user can't be imported input area N2 etc. at qos feature.
Below, N2 describes with regard to the input area.QoS object setting handling part 16 reads the content in the QoS object storage portion 22, and shows on the N2 of input area.Be specially, read the value of " priority " row in the QoS object storage portion 22, and show this value by each Service name.But be not the value that on the N2 of input area, directly shows above-mentioned " priority " row that read, show but express (preferential or non-preferential) by 2 values.For example, the value of " priority " row be expressed as in 0 o'clock non-preferential, the value of " priority " row be expressed as beyond 0 the time preferential.
If the user imports on the N2 of input area, the QoS object is set handling part 16 and is just upgraded QoS object storage portion 22.Be specially, extract from QoS object storage portion 22: the value of " Service name " row is consistent, clauses and subclauses with the user in the preferential service of the desire of input area selection that N2 imports.And the value that " priority " in these clauses and subclauses is listed as for example is updated to " 5 ".According to Home PlugAV specification, the priority when preferentially transmitting video/audio data flow is pushed elects " 5 " as, thus be " 5 " at this with priority level initializing, but priority also can be got other value.
In addition, about what extracted, the value of " Service name " row is consistent with the user in the non-preferential service of input area selection that N2 imports, and clauses and subclauses, the value that " priority " in these clauses and subclauses is listed as are updated to default value " 0 " for example (default value also can be 0 in addition value).
Not limiting the opportunity of above-mentioned renewal is when the user has carried out input to input area N2, also can be when key frame bottom " decision " key B3 is clicked.
As mentioned above, make the directly value of input priority of user, whether carry out preferentially but make the user import selection simply.Its reason is in order to make the user who is unfamiliar with the QoS setting also can carry out the related setting of QoS more simply.Think that the user that sets in detail can be by clicking " setting in detail " key B 1, and set picture 162 by detailed version QoS object described later and carry out various settings that version QoS object is set and contained more the project that can set in the picture 162 in detail.
" service is appended " key B2 below is described.After the user has clicked " service is appended " key B2, the QoS object upgrades handling part 17 and just communicates with update service device 602, with the data that obtain the new clauses and subclauses that will append to QoS object storage portion 22 from update service device 602 (group of being made up of Service name, domain name and priority).For example, be not stored to as yet in the QoS object storage portion 22 when existing in the update service device 602, service " looking audio frequency delivery server E " by name, domain name be " service-e.co.jp " priority when being the data of " 5 ", just obtains these data.Then, according to these data that obtain, the QoS object upgrades handling part 17 and generate the clauses and subclauses that make new advances in QoS object storage portion 22.What generate in last example is service " looking audio frequency delivery server E " by name, and domain name is " service-e.co.jp ", and priority is the clauses and subclauses of " 5 ".
About the above-mentioned opportunity of obtaining processing, not limiting is that for example, the cycle conducts interviews to update service device 602 in accordance with regulations, and obtains above-mentioned data when having clicked " service is appended " key B2.At this moment, when in QoS object storage portion 22, generating new clauses and subclauses, also can correspondingly show predetermined affirmation information to the user.
In addition, when having generated above-mentioned new clauses and subclauses in QoS object storage portion 22, the QoS object upgrades handling part 17 and sets handling part 16 to the QoS object and notify this item.After QoS object setting handling part 16 receives this notice, send the tentation data (for example, html data) that is used to constitute QoS object setting picture 161, set picture 161 with the QoS object that upgrades simple and easy version to data source and sink 400.For example, in last example, send the tentation data (for example, html data) that constitutes in order to show input area N2 on picture to data source and sink 400, the user can import by this input area N2 and whether preferentially enjoy " looking audio frequency delivery server E ".
(version QoS object is set picture in detail)
Next, with reference to Figure 10, the picture example of version QoS object setting picture 162 in detail is described.Figure 10 is the expression ideograph of the picture example of version QoS object setting picture 162 in detail.
Key frame is set handling part 16 by the QoS object and is provided according to the request from data source and sink 400, and the user of data source and sink 400 is by visit key frames such as Web browsers.On key frame, can carry out setting picture 161 and set in more detail than simple and easy version QoS object shown in Figure 9.
At this, it is envisaged for setting and " set in detail " in the picture 161 after key B1 is clicked at simple and easy version QoS object shown in Figure 9, enter key frame.But be not limited thereto, also can go up and set the link that is used to jump into key frame, also can on Web browser, directly import the URL of key frame by the user at the related setting picture (the setting picture of general router) of the root functionality of HGW101 etc.
As shown in the figure, show on the key frame: (1) looks the title of audio frequency delivery service; (2) look the domain name of audio frequency delivery service; Priority when (3) the audio frequency delivery service is looked in enjoyment; (4) receive the device name of the data source and sink 400 of the data flow look the audio frequency delivery service; (5) the IP address of this data source and sink 400; (6) priority of each data source and sink 400 when the audio frequency delivery service is looked in enjoyment.
Wherein, and do not require and to show above-mentioned (4).In addition, except the IP address of above-mentioned (5), the MAC Address of all right video data R-T unit 400.
About above-mentioned (1)～(3), be to show by the content that reads in the QoS object storage portion 22.Be specially, the value of " Service name " in the QoS object storage portion 22 row, the value of " domain name " row, the value of " priority " row are shown as above-mentioned (1)～(3) respectively.In addition, about above-mentioned (5) and (6), be to show by the content in the reading of data packet priority storage part 23.Be specially, the value of " client IP address " in the packet priority storage part 23 row, the value of " priority " row are shown as above-mentioned (5) and (6) respectively.In addition,, can use predetermined agreement to obtain, perhaps wait to show by user's input by HGW101 from data source and sink 400 about above-mentioned (4).
For above-mentioned (3), the user can import the numerical value (0～7) of expression priority by input area N3.For above-mentioned (6), the user can import the numerical value (0～7) of expression priority by input area N4.For above-mentioned (2), the user can import character string arbitrarily by input area N5.About input area N3 and N4, imagining them is drop-down menu or list box.About input area N5, imagining it is text box.But this is not particularly limited.
When the user had imported priority by input area N3, the QoS object was set 16 pairs of QoS object storage of handling part portion 22 and is upgraded.Be specially, extract from QoS object storage portion 22: the value of " Service name " row is consistent, clauses and subclauses with the user in the corresponding with service of the priority of input area N3 input.And the value that " priority " in these clauses and subclauses is listed as is updated to the priority that above-mentioned user imports.
At this, it is when the user has carried out input to input area N3 that the timing of above-mentioned renewal does not limit, also can be when key frame bottom " decision " key B5 is clicked.
When the user had imported priority by input area N4, the QoS object was set handling part 16 pairs of QoS object storage portion 22 or packet priority storage part 23 upgrades.Be specially, extract from QoS object storage portion 22 or from packet priority storage part 23: the value of " domain name " row is consistent, clauses and subclauses with the user in the corresponding with service domain name of the priority of input area N4 input.And the value that " priority " in these clauses and subclauses is listed as is updated to the priority that above-mentioned user imports.
At this, it is when the user has carried out input to input area N4 that the timing of above-mentioned renewal does not limit, also can be when key frame bottom " decision " key B5 is clicked.
The reason of the priority when why making the user look the audio frequency delivery service with regard to each data source and sink 400 input enjoyment as described above is: for example, when the data source and sink 400 of looking the data flow of audio frequency delivery service A when reception is STB402 and PC403, preferentially transmit the data flow of looking audio frequency delivery service A if think to STB402, do not look audio frequency delivery service A and preferentially do not transmit yet, then preferentially can set priority with regard to each data source and sink 400 to PC403.
At this, when the user has imported priority by input area N3, also the value of the priority of the input area N4 of correspondence can be updated to and in the identical value of value of input area N3 input.
In addition, when the user had imported domain name by input area N5, the QoS object was set handling part 16 and just QoS object storage portion 22 is upgraded.Be specially, extract from QoS object storage portion 22: the value of " Service name " row is consistent, clauses and subclauses with the user in the corresponding with service of the domain name of input area N5 input.And the value that " domain name " in these clauses and subclauses is listed as is updated to the domain name that above-mentioned user imports.
In addition, about with the data source and sink 400 of receiving data stream not corresponding look the audio frequency delivery service, can in above-mentioned (4), be shown as " nothing ", in above-mentioned (5), be shown as "-", thus input area N4 is set for the state that the user can't import and gets final product.In picture shown in Figure 10, look audio frequency delivery service B and look audio frequency delivery service D and be equivalent to above-mentioned " not corresponding look audio frequency delivery service ".
In addition, when showing key frame, increase and decrease to some extent, for reflection increase and decrease situation on key frame if receive the data source and sink 400 of the data flow of looking the audio frequency delivery service, can send once more to data source and sink 400 and constitute the tentation data (for example, html data) that the QoS object is set picture 162.
Next " service is appended " key B4 is described.Processing action when the user has clicked " service is appended " key B4 and user are identical when having clicked " service is appended " key B2 in the picture shown in Figure 9.That is, the QoS object upgrades handling part 17 and communicates with update service device 602, obtains the data (group of being made up of Service name, domain name and priority) of the new clauses and subclauses that will append to QoS object storage portion 22 thus from update service device 602.Then, according to these data that obtain, the QoS object upgrades handling part 17 and generate the clauses and subclauses that make new advances in QoS object storage portion 22.When in QoS object storage portion 22, having generated above-mentioned new clauses and subclauses, the QoS object upgrades handling part 17 and just notifies this item to QoS object setting handling part 16, and the QoS object is set 16 pairs of detailed version QoS objects setting pictures 162 of handling part and is upgraded, to show above-mentioned new clauses and subclauses.
As mentioned above, in the present embodiment, HGW101 obtains the corresponding priority of domain name with the server 600 that contains among the DNS apply for information of data source and sink 400 receptions from QoS object storage portion 22.Then, the above-mentioned priority that obtains and, by the group that the IP address of the IP address of the data source and sink 400 that sends above-mentioned DNS apply for information and the server 600 that must get according to above-mentioned DNS apply for information is formed, be stored in accordingly mutually in the packet priority storage part 23.
Then, according to the packet that sends to data source and sink 400 from server 600, obtain from packet priority storage part 23: corresponding with the group of being formed by the transmission destination mailing address of the transmit leg mailing address this packet and this packet, above-mentioned priority.Then, the above-mentioned priority level initializing of obtaining from packet priority storage part 23 is become above-mentioned priority of data packets.
Then, according to the priority of above-mentioned setting, the transmission of above-mentioned packet is controlled.
Therefore, can set the corresponding priority of the domain name of each server 600 for send to data source and sink 400 priority of data packets, and control the transmission of above-mentioned packet according to the priority of this setting from server 600.
Thereby, during situation that the data flow of 600 that transmitted at different each server of domain name, as to have used identical negotiation agreement content (for example high definition look audio content and the low audio content of looking clearly) is transmitted in same communication network, if each data flow is all preferentially transmitted, then the transmission bandwidth of communication network can be not enough.At this moment,, can only preferentially transmit (for example, only the audio content of looking to high definition transmits), even therefore under above-mentioned condition, also can realize QoS according to domain name to certain data flow by the HGW101 of present embodiment.
(variation 1)
More than, according to structure example shown in Figure 3 above-mentioned execution mode has been described, but has been not limited to this structure example.Below, the structure example of other system is described with reference to Figure 11.Figure 11 is the pattern block diagram of other concrete structure examples of expression communication control system shown in Figure 2.
The structure example of Figure 11 and the structure example of Fig. 3 are basic identical, but have set up wireless lan network 901 between PLC adapter 302 and STB402 and PC403.And, be connected with wireless lan network 901 in order to make PLC adapter 302 and STB402, PC403, be connected with wireless lan adapter 801, wireless lan adapter 802 and wireless lan adapter 803 respectively.At this, the imagination WLAN is based on the mode of IEEE802.11e or IEEE802.11n.
(structure of wireless lan adapter)
Below, with reference to Figure 12, the schematic configuration of wireless lan adapter 801 (802,803) is described.Figure 12 is the block diagram of the schematic configuration of expression wireless lan adapter 801 (802,803).
As shown in figure 12, wireless lan adapter 801 (802,803) comprises control part 810, ethernet communication portion 831 and WLAN Department of Communication Force 832.
Ethernet communication portion 831 communicates with the device that is connected with this ethernet communication portion 831 by Ethernet that is situated between.In structure example shown in Figure 11, the ethernet communication portion 831 and the PLC adapter 301 of wireless lan adapter 801 communicate, the ethernet communication portion 831 and the STB402 of wireless lan adapter 802 communicate, in addition, the ethernet communication portion 831 of wireless lan adapter 803 communicates with PC403.
Other wireless lan adapters on WLAN Department of Communication Force 832 and the wireless lan network 901 communicate.
810 pairs of ethernet communication portions 831 of control part and WLAN Department of Communication Force 832 are controlled, and the calculation process of being scheduled to.Control part 810 includes QoS handling part 811.
QoS handling part 811 convert the packet that can transmit on wireless lan network 901, and the packet after will changing sends to WLAN Department of Communication Force 832 to the packet that is dealt into ethernet communication portion 831 from by the Ethernet continuous external device (ED) of being situated between.In addition, the packet that is dealt into WLAN Department of Communication Force 832 from wireless lan network 901, convert to and can upwards give an account of the packet that the device that connected by Ethernet transmits, and the packet after will changing sends to ethernet communication portion 831.
At this moment, QoS handling part 811 is preferentially controlled according to priority of data packets.That is,, preferentially control according to the value of the DSCP of this IP packet for the IP packet; For the packet that on wireless lan network, transmits, preferentially control based on the priority of the corresponding wireless lan network of changing from the DSCP value.
At this, QoS handling part 811 not only to the packet that sends to data source and sink 400 from server 600 (for example, video/audio bag etc.) preferentially control, can also preferentially control the packet that sends to server 600 from data source and sink 400 (for example, ACK etc.).
Like this, in wireless lan adapter 801 (802,803), also basis is from the DSCP value that HGW101 paid priority that change out, corresponding wireless lan network, come packet is preferentially controlled, therefore, in structure example shown in Figure 11, the present invention also brings into play effect.
For example, when will preferentially transmitting when looking audio frequency delivery server 603 to video/audio data flow that STB402 transmits, in HGW101, the dscp field of the packet under in the video/audio data flow is updated to the value of expression high priority, then, this data flow is preferentially transmitted according to dscp field when being transmitted to PLC adapter 302 from PLC adapter 301 on the PLC network; In addition, this data flow from wireless lan adapter 801 when wireless lan adapter 802 transmits, also preferentially transmitted according to dscp field.Like this, even to the transfer path that STB402 transmits, have a plurality of networks from looking audio frequency delivery server 603, as long as the network in the path obtains the support based on the QoS of DSCP, the present invention just can realize the QoS of (end-to-end) between end and the end.
(variation 2)
Below, with reference to Figure 13, other concrete structure examples of communication control system shown in Figure 2 are described.Figure 13 is the pattern block diagram of other concrete structure examples of expression communication control system shown in Figure 2.
The difference of the structure example of Figure 13 and structure example shown in Figure 3 is, does not comprise PLC network 501.And, in this example, directly be connected with the ethernet communication portion 33 of HGW101 as the STB404 and the PC407 of data source and sink 400.In addition, the WLAN Department of Communication Force 34 of HGW101 directly is connected with wireless lan network 901.
Below, illustrate preferential transmit from look video/audio data flow that audio frequency delivery server 603 transmits to STB404 and, from looking the situation of audio frequency delivery server 604 when the video/audio data flow that STB402 transmits.
About from looking the packet of audio frequency delivery server 603 under to the video/audio data flow that STB404 transmits, the dscp field of this packet is updated to the value of expression high priority in the packet priority change handling part 14 of HGW101, and passes on handling part 11 by packet and be sent to the ethernet communication portion 33 of HGW101.At this moment, this packet at first is subjected to buffering (also can cushion) in ethernet communication portion 33 in packet passes on handling part, as there being the packet that does not send, just from the high packet of priority, send in order (packet maintenance/issue unit).Therefore, when being connected with STB404 and PC407 in the ethernet communication portion 33 of HGW101, the packet that sends to STB404 can preferentially be sent to Ethernet, therefore also can corresponding priority realize QoS between the data flow that STB404 and PC407 received.Therefore the present invention can effectively bring into play its effect.
Equally, in the WLAN Department of Communication Force 34 of HGW101, also packet is cushioned, and, send in order from the high packet of priority.Therefore, when being connected with STB402 and PC403 in the network, the packet that send to STB402 can preferentially be sent to wireless lan network 901, thereby also can corresponding priority realize QoS between the data flow that STB402 and PC403 received.Therefore the present invention can effectively bring into play its effect.
(variation 3)
In the explanation of sequence chart shown in Figure 4, though be after the priority data that has carried out step S204 generates processing, in step S205, ask video/audio by STB402, but also can be before priority data generates the processing end, by STB402 request video/audio.Its result also may be before priority data generates the processing end, and HGW101 is from looking audio frequency delivery server 603 receiving audio datas.When this situation, can carry out the packet priority change to the affiliated video/audio bag that generates the video/audio data flow that receives before the processing end at priority data handles (promptly, can't upgrade the value of the priority (DSCP) of video/audio bag), be not carried out preferential transmission when consequently this packet is by HGW101.
Below, illustrate that with reference to Figure 16 the video/audio bag is not carried out the situation of preferential transmission by HGW101.Figure 16 is the mode sequences figure of the example of expression video/audio bag when not being carried out preferential the transmission by HGW101.
As shown in figure 16, HGW101 carries out priority data and generates processing (step S204) after STB402 replys the DNS answer message.But the STB402 that receives the DNS answer message also may be just to looking the request (step S205) that audio frequency delivery server 603 sends video/audio before priority data generates the processing end.Answer as this request, look 603 beginnings of audio frequency delivery server and send video/audio data flow (step S206) to STB402, but when the video/audio that arrives HGW101 before priority data generation processing finishes wraps in by HGW101, by preferential the transmission (the common transmission).And the video/audio bag that arrives HGW101 after the priority data generation processing end is just preferentially transmitted.
Want to solve the above problems, can treat that HGW101 finishes after priority data generate to handle, pass on the DNS answer message to the STB402 of inquiry side.Thus, after finishing priority data generation processing, STB402 carries out the request of video/audio.Its result, HGW101 finish priority data and generate after the processing, from looking audio frequency delivery server 603 receiving audio datas stream.Therefore, can carry out the packet priority change to all the affiliated video/audio bags in the video/audio data flow of the audio frequency delivery server 603 of considering oneself as and handle, so this video/audio bag is all preferentially transmitted.
Below, with reference to Figure 17, the situation when all video/audio bags are preferentially transmitted is described.Figure 17 is the mode sequences figure of an example when all video/audio bags are preferentially transmitted.
As shown in figure 17, HGW101 has carried out after DNS handles, and does not send DNS answer message (step S202 ') to STB402, but finish priority data generate handle after, to STB402 transmission DNS answer message (step S204 ').Then, receive the STB402 of DNS answer message to looking the request (step S205) that audio frequency delivery server 603 sends video/audio.As the answer of this request, look 603 beginnings of audio frequency delivery server and send video/audio data flow (step S206) to STB402, therefore, the video/audio bag that arrives HGW101 can all preferentially be transmitted.
(supplementary notes)
The priority that packet priority storage part 23 is stored can only constitute corresponding relation with transmission IP address, destination.That is, can from the data structure shown in the table 4, remove " server ip address " row.In this case, when carrying out the processing of packet priority change, only the IP address, transmission destination according to packet judges whether to change priority of data packets.Therefore, send the object that also becomes preferential transmission to the packet of data source and sink 400 from looking audio frequency delivery server 603 or looking audio frequency delivery server 604 device in addition.For example, (Digital Living Network Alliance: DLNA) server also becomes the object that preferentially transmits via HGW101 to the video/audio data flow that television set 405 sends from the DLNA that is located at family.
(execution mode 2)
Below carry out briefly bright to the communication control unit 100 of above-mentioned execution mode 1 once more.Figure 18 is the ideograph of the basic structure example of a kind of communication control system of expression, and this communication control system comprises the communication control unit 100 of execution mode 1.As shown in figure 18, communication control unit 100 has preferential transmission controlled function (as shown in phantom in Figure 18), and this preferentially transmits controlled function belongs to certain data flow in order to preferential transmission packet.In communication control unit 100, preestablish the domain name of looking the audio frequency delivery server that need preferentially transmit and this looks the priority of audio frequency delivery server, the communication control unit 100 preferential data flow that send to data source and sink 400 from the server consistent with this domain name 600 that transmit.
In execution mode 1, above-mentioned preferential transmission controlled function is realized by communication control unit 100.But relay 300 also can have above-mentioned preferential transmission controlled function, to replace the communication control unit 100 of execution mode 1.At this point, in the present embodiment, this mode that is preferentially transmitted certain data flow by the communication repeating device that possesses preferential transmission controlled function is illustrated.For the communication repeating device of the preferential transmission controlled function of having of present embodiment, hereinafter referred to as " relay ".
Below, according to Figure 19～Figure 22, one embodiment of the present invention is described.As shown in figure 19, each relay 310 of present embodiment has the preferential transmission controlled function (as shown in phantom in Figure 19) that preferentially packet that belongs to certain data flow is transmitted separately.
For convenience of explanation, in the present embodiment, to execution mode 1 in the identical device of device that illustrated, omit its related description.And, to having the parts of identical function with each parts shown in the execution mode 1, its identical label of remarks, and omit its related description.Equally, to execution mode 1 in the identical processing of processing that illustrated, also omit its related description.
Described in the present embodiment " priority data generates and handles " is different processing with " priority data generates and handles " described in the execution mode 1.In the present embodiment, described " priority data generate handle " is represented is " priority data generates and handles " in the present embodiment.
In addition, about " packet ", " data flow " and " video/audio data flow " these terms of using in the present embodiment, it is identical with the definition described in the execution mode 1 separately.In addition, identical with execution mode 1, the PLC network of imagination present embodiment is to use the LAN of the PLC that follows the HomePlugAV specification.In addition, transmit priority and abbreviate " priority " as.
(basic structure of communication control system)
Referring again to Figure 19, to the relay that includes present embodiment, the basic structure of communication control system describes.Figure 19 is the communication control system that includes the relay of present embodiment, the pattern block diagram of basic structure example.As shown in figure 19, above-mentioned communication control system comprises present embodiment (a plurality of) relay 310, server 600, communication control unit 120 and (a plurality of) data source and sink 400.
As shown in figure 19, the relay 310 of present embodiment is arranged between communication control unit 120 and the data source and sink 400, and comes the relay data bag with the 1st communication network 500 as transmitting media.Particularly, relay 310 has the preferential transmission controlled function that the packet that belongs to certain data flow is preferentially transmitted.
On the 1st communication network 500, connected a plurality of relays 310, these a plurality of relays 310 can be communicated by letter each other.And, except that with relay 310 that communication control unit 120 is connected, other relays 310 are connected with data source and sink 400 respectively, and can communicate with this data source and sink 400.
Server 600 and data source and sink 400 be identical with described in the execution mode 1 all, therefore omits its related description.
Haply, relay 310 is used for to data R-T unit 400 (data sink) mutual communication and carries out relaying, or communicating by letter of 400 of communication control unit 120 and data source and sinks carried out relaying.For example, relay 310 can be PLC adapter as ethernet bridge etc.If what relate to is the PLC adapter, so the just corresponding PLC of the 1st communication network 500.When relay 310 was the PLC adapter, relay 310 sent to the PLC side to the packet of delivering to himself from the Ethernet side, i.e. the 1st communication network 500.Otherwise relay 310 promptly, sends to the Ethernet side to the packet of delivering to himself from the 1st communication network 500 from the PLC side.If being sent to the destination of the packet of relay is this relay self, this packet is not just by relaying.
The transmission of 120 pairs of the communication control units packet of transmitting-receiving between the server 600 of the data source and sink 400 of LAN side and WAN side is controlled.Home gateway) communication control unit 120 specifically can be HGW (Home Gateway: router apparatus such as.Data source and sink 400 specifically can be net machines such as STB or PC.
According to said structure, the packet that data source and sink 400 sends in order to the request video/audio to server 600.Server 600 sends video/audio data flow to data source and sink 400.And data source and sink 400 sends packets such as control data bag to server 600.At this moment, the relay 310 that is connected with communication control unit 120 can preferentially transmit the packet that belongs to above-mentioned video/audio data flow.About the relay 310 that is connected with data source and sink 400, its this structure that preferentially transmits above-mentioned request data package and above-mentioned control data bag is the feature of the relay of present embodiment.
(the concrete structure example of communication control system)
Below, with reference to Figure 20, the concrete structure example of communication control system shown in Figure 19 is described.Figure 20 is the pattern block diagram of the concrete structure example of communication control system shown in Figure 19.Representedly among Figure 20 be the concrete example of the correspondence of each device shown in Figure 19 and communication network.
STB402 shown in Figure 20, PC403, STB404, television set 405, television set 406, PLC network 501, dns server 601, look audio frequency delivery server 603, Web server 605 and the Internet 701 respectively with explanation during execution mode 1 each counterpart among used Fig. 3 identical, therefore omit their related description.In addition, distribute to each the device IP address also described identical with execution mode 1.
In Figure 20, about the PLC adapter 311 as network bridge device used in the PLC network, PLC adapter 312 and PLC adapter 313, they are equivalent to 3 relays 310 shown in Figure 19 respectively.
Though the PLC adapter 311 shown in Figure 20, PLC adapter 312 and PLC adapter 313 are independent device separately, are not limited to this structure.For example, PLC adapter 311 can be built among the HGW121, and PLC adapter 312 can be built among STB402 and the PC403, and PLC adapter 313 can be built among the STB404.
HGW121 (communication control unit) is equivalent to the communication control unit 120 shown in Figure 19, and HGW121 is arranged on as the Internet 701 of WAN side and as the router apparatus between the Ethernet of LAN side.
In said structure, when user for example will by television set 405 audiovisual by look audio frequency delivery server 603 provided and delivered look audio content the time, STB402 can be to looking the packet that audio frequency delivery server 603 sends in order to the request video/audio.Then, look audio frequency delivery server 603 and can send video/audio data flow to STB402.In addition, STB402 can send packets such as control data bag to looking audio frequency delivery server 603.
At this moment, the PLC adapter that is connected with HGW121 311 can control preferentially transmits belonging to the packet of looking the video/audio data flow that audio frequency delivery server 603 provided and delivered.About the PLC adapter 312 that is connected with STB402, preferential this structure that transmits above-mentioned request data package and above-mentioned control data bag of its control is the feature of the relay of present embodiment.
Below, in statement during relay 310, if not special the appointment, relay 310 is meant single or multiple in they of PLC adapter 311, PLC adapter 312, PLC adapter 313.In addition, in statement during data source and sink 400, if not special the appointment, data source and sink 400 is meant single or multiple in they of STB402, PC403 and STB404.In addition, in statement during server 600, if not special the appointment, server 600 is meant dns server 601, looks audio frequency delivery server 603, Web server 605 they in single or multiple.
In addition, in the present embodiment, when STB402 looks audio frequency delivery server 603 in visit, look the IP address of audio frequency delivery server 603 to the HGW121 inquiry.HGW121 both can in case of necessity, also can inquire to dns server 601 earlier directly to STB402 foldback answer message, and then the foldback answer message.
(data source and sink plays the flow process summary that receives till the data from request msg)
Below, with reference to Figure 21, in the communication control system shown in Figure 20, STB402 plays from the summary of looking the flow process till audio frequency delivery server 603 receiving audio datas from the request video/audio and describes.Figure 21 is that model utility is represented in the communication control system shown in Figure 20, and STB402 plays the sequence chart of the flow process example till the receiving audio data from the request video/audio.At this, will suitably describe with reference to step S201 shown in Figure 4 in the execution mode 1～S208.
At first, STB402 when having accepted audiovisual and look the user of audio content and operate, with look audio frequency delivery server 603 and be connected before, STB402 sends the IP address of looking audio frequency delivery server 603 in order to inquiry, DNS apply for information (step S401) to HGW121 earlier.Be specially, inquire and i.e. " sv1.vod.service-a.co.jp " the corresponding IP address of the domain name of looking audio frequency delivery server 603.
Then, the above-mentioned DNS apply for information of PLC adapter 312 relayings in the path.At this, though all packets that PLC adapter 312 monitors himself institute's relaying promptly, constantly carry out the detection of DNS answer message and handle (to call " DNS detects processing " in the following text), yet because not being DNS, above-mentioned DNS apply for information do not detect the detected object of handling, so do not carry out above-mentioned detection (step S402).Detect the detailed process of handling about DNS, will illustrate afterwards.
Similarly, PLC adapter 311 also carries out DNS and detects processing, but detects the detected object of handling because above-mentioned DNS apply for information does not belong to DNS, so do not carry out above-mentioned detection.PLC adapter 311 passes on above-mentioned DNS apply for information (step S403) to HGW121.
Then, after HGW121 has received the DNS apply for information, carry out handling with the corresponding DNS of the DNS apply for information of above-mentioned reception.That is to say, if managed the corresponding IP of the domain name address of being inquired among the HGW121, just to STB402 transmission corresponding D NS answer message with institute.If HGW121 does not manage the corresponding IP of the domain name address of being inquired with institute, just to dns server 601 transmission DNS apply for information (step S404).
Then, dns server 601 can send corresponding D NS answer message after receiving the DNS apply for information.Be specially, dns server 601 foldback DNS answer message, this DNS answer message comprise and domain name " sv1.vod.service-a.co.jp " the corresponding IP address " 101.101.101.1 " (step S405) of being inquired.Then, HGW121 sends above-mentioned DNS answer message (step S404) to the STB402 as inquiry side after having received above-mentioned DNS answer message.
The above-mentioned DNS answer message that PLC adapter 311 relayings in the path are sent by HGW121.PLC adapter 311 carries out DNS detect to be handled, and what therefore this moment, PLC adapter 311 was detected is the DNS answer message.And, also detect as the domain name of inquiry object and predefined domain name whether consistent (step S406).
Owing to carried out above-mentioned detection, next PLC adapter 311 just generates in order to the processing of the data of expression packet priority (to call " priority data generates and handles " in the following text) (step S407).Because what PLC adapter 311 was known its reception is DNS answer message from HGW121 (Ethernet side), therefore generate when handling at priority data, generate in order to by looking the priority data that packet that audio frequency delivery server 603 is sent to STB402 preferentially transmits.Comprise transmit leg IP address in the priority data, send IP address, destination, priority.
Looking the IP address of audio frequency delivery server 603 can come to such an extent that get according to IP address contained in the DNS answer message.The IP address of STB402 can be come to such an extent that get according to the IP address, transmission destination of DNS answer message.About priority, usefulness be predefined value.Be specially, if with the corresponding priority of domain name " sv1.vod.service-a.co.jP " be " 5 ", just priority level initializing is become " 5 ".Priority data generates the detailed process of handling and will illustrate afterwards.
In addition, preferentially transmit in the processing at packet described later, PLC adapter 311 comes transfer data packets according to the priority data of above-mentioned generation.Be specially preferential the transmission by looking the packet that audio frequency delivery server 603 sends to STB402.The detailed process that packet preferentially transmits processing will illustrate afterwards.
In addition, the above-mentioned DNS answer message of PLC adapter 312 relayings in the path.At this moment, whether 312 detections of PLC adapter are DNS answer message.And, also detect as the domain name of inquiry object whether with predefined domain name in certain consistent (step S408).
Owing to carried out above-mentioned detection, next PLC adapter 312 just carries out priority data and generates processing (step S409).Because what PLC adapter 312 was known its reception is DNS answer message from STB402 (PLC side), therefore generate in the processing at priority data, generate in order to priority data to preferentially transmitting to the packet of looking audio frequency delivery server 603 by the STB402 transmission.
In addition, preferentially transmit in the processing at packet described later, PLC adapter 312 is according to the priority data of above-mentioned generation, preferential transfer data packets.Be specially, the preferential transmission by STB402 sends to the packet of looking audio frequency delivery server 603.
After STB402 has received the DNS answer message, look audio content, can send the request data package (step S410) of asking video/audio to looking audio frequency delivery server 603 in order to begin to receive.So, this request data package of PLC adapter 312 relayings in the path.
During PLC adapter 312 relay data bags, judge whether the priority data of this packet and above-mentioned generation coincide,, just preferentially transmit this packet (packet preferentially transmits processing) if coincide.
Because above-mentioned request data package and priority data coincide (that is, transmit leg IP address is STB402, and sends IP address, destination for looking audio frequency delivery server 603), so PLC adapter 312 can preferentially transmit above-mentioned request data package (step S411).
Handle above-mentioned passing on, use " priority " in the priority data of above-mentioned generation.For example, if " priority " in the priority data is " 5 ", then this request data package is passed on priority " 5 ".
The packet of present embodiment preferentially transmits to handle and is different from execution mode 1, that is, the value of priority of data packets field (DSCP) itself is not updated.The detailed process that packet preferentially transmits processing will illustrate afterwards.
After looking the above-mentioned request data package of audio frequency delivery server 603 receptions,, send video/audio data flow (step S413) to STB402 as answer.This video/audio data flow of PLC adapter 311 relayings in the path.When PLC adapter 311 relay data bags, carry out packet equally and preferentially transmit processing.
Because belonging to the video/audio bag and the priority data of video/audio data flow coincide (promptly, transmit leg IP address is for looking audio frequency delivery server 603, and sending IP address, destination is STB402), so PLC adapter 311 can preferentially transmit this video/audio bag (step S414).
STB402 receives the video/audio bag that sends from PLC adapter 312, and exports to television set 405 behind conversion (decoding) one-tenth video/audio signal, looks audio frequency reset (step S416) thus.
And as user during to straighforward operations such as looking audio frequency and carry out F.F. or retreat, STB402 can send the control data bags to looking audio frequency delivery server 603.S411 is the same with step, and the PLC adapter 312 in the path can preferentially pass on this control data bag.
Flow process by above explanation as can be known, particularly in PLC network 501, can be preferentially these transmit looking the packet of receiving and dispatching between audio frequency delivery server 603 and the STB402 to request data package, video/audio bag, control data bag.Thus, for example when audiovisual on television set 405 look audio frequency delivery server 603 provided look audio content the time, can either play the effect of the disorder when suppressing to look voice playing, can play again and suppress the server effect slow the answer of straighforward operation.
PLC adapter 311, PLC adapter 312 and PLC adapter 313 have a plurality of transmit queues (queue) corresponding to different priorities, the packet that this transmit queue is passed in order to buffering.The packet that passes on be buffered to the corresponding transmit queue of this priority of data packets in.Packet from the transmit queue that is buffered in high priority passes on processing in order.
(structure of PLC adapter)
Below, with reference to Figure 22, the schematic configuration as the PLC adapter 311 (312,313) of relay 310 is described.Figure 22 is the block diagram of the schematic configuration of expression PLC adapter 311 (312,313).
As shown in figure 22, PLC adapter 311 (312,313) comprises control part 210, storage part 220, ethernet communication portion 231 and plc communication portion 232 (packet maintenance/issue unit).
210 pairs of storage parts 220 of control part, ethernet communication portion 231 and plc communication portion 232 control, and the calculation of being scheduled to is handled.Predetermined calculation is handled and is meant, for example, DNS detects and handles, priority data generates and handles, packet preferentially transmits processing etc.The detailed structure of control part 210 will illustrate afterwards.
Required data are stored when handling procedure when 220 pairs of control parts of storage part 210 are carried out processing or processing.Storage part specifically can be realized by nonvolatile memories such as volatile memory such as RAM and ROM, flash memories.Above-mentioned various data are stored in the various storage parts of storage part 220 inside.Storage part 220 comprises QoS object storage portion 222 (the 1st storage part) and packet priority storage part 223 (packet prior information storage part, the 2nd storage part).
QoS object storage portion 222 includes and wants the server domain name that preferentially transmits, and the priority when enjoying the service that this server provides.For example, QoS object storage portion 222 can have the data structure shown in the table 5.That is, the clauses and subclauses that comprise the group of being made up of " domain name " and " priority " are stored.
(table 5)
Domain name Priority
sv1.vod.service-a.co.jp 5
vod1.service-c.ne.jp 4
Items for information in the QoS object storage portion 222 for example can be when the factory shipment of PLC adapter, and is pre-set by manufacturer.
In addition, also can upgrade items for information in the QoS object storage portion 222, perhaps, also can in firmware updating, upgrade the items for information in the QoS object storage portion 222 by the user.Those are not essential part of the present invention, therefore omit their detailed explanations.QoS object storage portion 222 is nonvolatile memory normally.
Packet priority storage part 223 is in order to store the precedence information of adapter 311 (312,313) when the transfer of data bag.Packet priority storage part 223 for example can have the data structure shown in the table 6.That is, the priority data that comprises the group of being made up of " transmit leg IP address ", " sending IP address, destination ", " priority " is stored.
(table 6)
Transmit leg IP address Send IP address, destination Priority
101.101.101.1 192.168.0.2 5
101.101.101.2 192.168.0.2 5
192.168.0.2 101.101.101.1 5
192.168.0.2 101.101.101.2 5
103.103.103.1 192.168.0.4 4
192.168.0.4 103.103.103.1 4
" transmit leg IP address " is meant the packet that need preferentially be transmitted, transmit leg IP address." send IP address, destination " is meant the packet that need preferentially be transmitted, and sends IP address, destination." priority " is the value of the expression priority of data packets of being passed on.Numerical value is big more, and priority is just high more.The priority data of packet priority storage part 223 is stored in volatile memory or the nonvolatile memory.For the priority data of permanence, should be stored in the nonvolatile memory, for temporary priority data, should be stored in the memory of volatibility.When the PLC adapter cut off the power supply, the priority data that is stored in the volatile memory will be by cancellation.
Ethernet communication portion 231 communicates with the external device (ED) that is connected in this ethernet communication portion 231 self by Ethernet that is situated between.
The PLC adapter except that from the PLC adapter in plc communication portion 232 and the PLC network 501 communicates.
And plc communication portion 232 has a plurality of transmit queues (not having diagram) corresponding to different priorities, the packet that this transmit queue sends to PLC network 501 in order to buffering.The packet that sends be buffered to the corresponding transmit queue of this priority of data packets in, simultaneously, the packet from the transmit queue that is buffered in high priority sends packet in order.
Below control part 210 is elaborated.Control part 210 comprises packet and passes on handling part 211 (packet transmit control unit), DNS test section 212 (domain name/address extraction unit, domain name/address solves packet and obtains the unit, domain name/address solves data packet detecting unit unit), priority data generates handling part 213 (prior information generation unit, territory priority obtains the unit, the priority data generation unit, the unit is obtained in the address, priority data generates processing unit), packet preferentially transmits handling part 214 (sender address/transmission destination-address retrieval unit, packet priority obtains the unit, packet preferentially transmits processing unit, the preferential delivery unit of packet), and priority data is eliminated handling part 215 (prior information elimination unit).
At first, data packet transfer handling part 211 is described.Data are passed on handling part 211 and are carried out the processing of passing on of packet.In packet passed on processing, ethernet communication portion 231 sent the packet from external device (ED) that is situated between by Ethernet received to PLC network 501 sides,, transfers to plc communication portion 232 that is.Otherwise plc communication portion 232 sends the packet that receives from PLC network 501 to the Ethernet side,, transfers to ethernet communication portion 231 that is.
And packet passes on handling part 211 when the transfer of data bag, preferentially transmits the priority that handling part 214 is determined according to packet, carries out the transmission control of this packet.Be specially, plc communication portion 232 is when transferring to PLC network 501 to the packet that is received from Ethernet by ethernet communication portion 231, this packet is put among the different a plurality of transmit queues of priority, preferentially transmitted the corresponding transmit queue of priority that handling part 214 is determined with packet.Preferentially transmit handling part 214 about packet, will illustrate afterwards.
In addition, when packet preferentially transmits the priority of data packets that handling part 214 fails to determine to pass on, can use the priority of acquiescence.The priority of acquiescence is generally used for " (best effort) does one's best ", promptly preferentially passes on as far as possible.
DNS test section 212 monitors by packet and passes on the packet that handling part 211 passes on.DNS test section 212 had both monitored the packet of receiving from the Ethernet side joint, monitored the packet that receives from PLC network 501 again.DNS test section 212 can be obtained the information which network to receive (be to receive from the Ethernet side joint, still receive from PLC network 501) in order to the expression packet from.
Below, DNS test section 212 is described.At first, DNS test section 212 checks whether packets pass on the packet that handling part 211 received is UDP (User Datagram Protocol: User Datagram Protoco (UDP)) packet.This packet is if the UDP message bag, and DNS test section 212 checks just whether the transmit leg port numbers (port number) of this packet is the well-known port numbers (53) of DNS.Above-mentioned transmit leg port numbers is if the well-known port numbers (53) of DNS, and this packet is the DNS packet.
In addition, DNS test section 212 checks also whether the value of DNS packet " Response " position (bit) is " 1 " (answer).If the value of " Response " position is " 1 " (answer), then this packet is that DNS answers packet.
And DNS test section 212 checks also whether the value of DNS answer " Reply Code " that packet comprised is " No error " (inerrancy).If the value of " Reply Code " is " No error " (inerrancy), then DNS test section 212 is answered packet as detecting the object of handling with this DNS.Otherwise this DNS answers packet and is not used as the object that detects processing.
If this packet is the packet of DNS answer message, then DNS test section 212 checks that also the contained inquiry object domain name of this packet is whether consistent with " domain name " in the items for information that QoS object storage portion 222 is managed.If check out the items for information that is consistent, just DNS test section 212 is notified to priority data generation handling part 213 with inherent content and this corresponding to items for information of the packet of this DNS answer message.And, will be the information that receives from which network also in order to the expression packet, be notified to priority data and generate handling part 213.In addition, also may take place with a plurality of items for information in " domain name " all consistent situation, when this situation, use be the items for information that is consistent at first.If do not check out the items for information that is consistent, DNS test section 212 constipation bundles are handled.
Below, priority data is generated handling part 213 describe.Priority data generates the priority data that handling part 213 generates shown in table 7 and table 8, and priority data is stored in the packet priority storage part 223.
If DNS answers packet and receives from the Ethernet side joint, just generate priority data as shown in table 7 (from looking the direction of audio frequency delivery server 603 to STB402).
If DNS answers packet and receives from PLC network 501, just generate priority data as shown in table 8 (from STB402 to the direction of looking audio frequency delivery server 603).
(table 7)
Figure BPA00001248535700681
(table 8)
Figure BPA00001248535700682
With the corresponding IP of the domain name address of the contained inquiry object of DNS answer message for example can be the IP address of looking audio frequency delivery server 603.The IP address, transmission destination of DNS answer message for example can be the IP address of data source and sink 400.And if a plurality of corresponding IP of domain name addresses of being inquired with quilt are arranged, then therewith correspondingly, the priority data of above-mentioned generation also is a plurality of.
The priority data that priority data generation handling part 213 is generated is stored to volatile memory or nonvolatile memory.If be stored in the volatile memory, when the PLC adapter cut off the power supply, this priority data was just by cancellation.
Below, packet is preferentially transmitted handling part 214 describe.Packet preferentially transmits handling part 214 and analyzes packets and pass on the packet that handling part 211 desires will pass on.Packet after the analysis is if the preferential object that transmits, and just this priority of data packets is notified to packet and passes on handling part 211.
Be specially, packet preferentially transmits handling part 214 at first from packet passes on the packet that handling part 211 will pass on, and extracts the header of transmit leg IP address/IP address, transmission destination etc.
Then, packet preferentially transmits handling part 214 and extracts from the clauses and subclauses that packet priority storage part 223 is stored: the value of " transmit leg IP address " row is consistent with the transmit leg IP address of said extracted, and the value of row and the IP address, transmission destination of said extracted are corresponding to " to send IP address, destination ", clauses and subclauses.
At this moment, if fail to extract above-mentioned clauses and subclauses, then packet passes on handling part 211 and passes on this packet according to the priority of acquiescence.The priority of acquiescence is generally used for " (besteffort) does one's best ", promptly preferentially passes on as far as possible.
If extracted above-mentioned clauses and subclauses, just preferentially transmitting handling part 214, packet from the clauses and subclauses that extract, obtains " priority ", packet passes on handling part 211 and passes on this packet according to this " priority " that obtains.
Below, priority data is eliminated handling part 215 describe.Priority data is eliminated handling part 215 with predetermined cycle (for example 1 second) retrieve data packet priority storage part 223, to eliminate overtime priority data.
Judge whether that overtime concrete grammar for example can have following 3 kinds.
The 1st method is from receiving the packet that last and certain priority data coincide, if passed through the scheduled time (for example 300 seconds), just to be judged as overtime.In the method, packet preferentially transmits handling part 214 and no matter when has received the packet that coincide with priority data, system time in the time of all will receiving this packet and this priority data are stored, and when storage, make this system time corresponding mutually with this priority data.When last reception packet has passed through the scheduled time, priority data is eliminated handling part 215 and is just eliminated this priority data.
The 2nd method be, when priority data generates, if passed through the scheduled time (for example 3600 seconds), just is judged as overtime.In the method, priority data generates handling part 213 when generating priority data, and system time and this priority data during with generation are stored, and when storage, makes this system time corresponding mutually with this priority data.When the generation of priority data has been passed through the scheduled time constantly, priority data is eliminated handling part 215 and is just eliminated this priority data.
The overtime time can not be the value of fixing, and also can be set to be contained TTL (Time To Live: life span) in the DNS answer packet.In general, the effective time of the IP address during DNS answers till the TTL, so, having passed through should the time time, just send DNS inquiry packet once more.
The 3rd method is the number of the priority data that limit priority data generation handling part 213 is generated.For example, the number of limit priority data is N.Priority data generates handling part 213 when generating priority data, checks which priority data that generates above-mentioned priority data is.If the priority data before N or N then is stored to it in packet priority storage part 223.In the time will generating N+1 priority data, the oldest priority data can be eliminated.Like this, as long as just a up-to-date N priority data is remained valid can.
In addition, also might there be the installation method that does not contain priority data elimination handling part 215.When this situation, priority data is stored in the volatile memory in advance, and when the PLC adapter cut off the power supply, priority data just was eliminated.
(reason that the packet that sends to server from data source and sink is preferentially transmitted)
In the above description, the packet that is sent to server 600 by data source and sink 400 also is used as the object of the preferential transmission of PLC adapter 311 (312,313) institute.At this, further its reason is described.
For example, imagine following situation: when data source and sinks such as STB402 400 receive the video/audio bag of the audio frequency delivery server 603 of considering oneself as, if the user is to operations such as looking audio frequency and carry out F.F., retreat, operates corresponding control command with this and just be sent to and look audio frequency delivery server 603 from data source and sink 400.
In these cases, if the packet of above-mentioned control command is lost, although be to operate to the user so, yet the answer at this operation can not appear in transport process.In addition,, operate from the user so, during actual F.F. or this section of retreating, just can postpone if delay has taken place in the transmission of the packet of above-mentioned control command.No matter above-mentioned which kind of situation all can impact user's operability.
Therefore, about the packet as above-mentioned control command, to this packet that server 600 sends, can improve user's operability by preferential transmission data source and sink 400.
(effect)
As mentioned above, according to present embodiment, PLC adapter 311 (312,313) is obtained the corresponding priority of domain name with the contained inquiry object of DNS answer message from QoS object storage portion 222.And, can be with the group of being formed by the IP address, transmission destination of the IP address of the contained inquiry object of above-mentioned DNS answer message and above-mentioned DNS answer message, and the above-mentioned priority that obtains is stored to packet priority storage part 223, and when storage, make this group and this priority corresponding mutually.
In addition, packet according to PLC adapter 311 (312,313) institute relaying, obtain the corresponding priority of group with following IP address from packet priority storage part 223, this IP group of addresses is: the group of being made up of the IP address, transmission destination of the transmit leg IP address of the packet of PLC adapter 311 (312,313) institute relaying and this packet.And above-mentioned packet is placed into from the corresponding transmit queue of above-mentioned priority that packet priority storage part 223 is obtained, and the packet from be buffered in the higher transmit queue of priority passes on processing in order.
Therefore, be can be according to transmitting data flow with the corresponding priority of domain name for the effect of the PLC adapter 311 of present embodiment (312,313).
(execution mode 3)
Towards television set, STB and looking in the audio frequency delivery service of providing, can exist not towards what PC provided and look the audio frequency delivery service.When this situation, television set, STB be visit (PC also can visit) portal server (Portal Server) earlier, and then access plane is to the portal server (non-diagram) of television set.
Portal server towards television set is meant, for the special-purpose portal server of television set (STB).Television set (STB) is when being connected with portal server, and portal server identifies this and is connected to visit from television set (STB), and indication TV machine (STB) is connected with portal server towards television set.Therefore, television set (STB) had both sent the DNS apply for information at portal server when being connected with portal server, also send the DNS apply for information at the portal server of television set.
When PC was connected with portal server, portal server identified this and is connected to visit from PC, did not therefore indicate PC to be connected with portal server towards television set.Therefore, PC only sends the DNS apply for information at portal server when being connected with portal server.
In the present embodiment of following explanation, can preferentially transmit packet at television set, STB transmitting-receiving.More precisely, in the following description, about repeatedly sending the data source and sink 400 of DNS apply for information in the given time, the packet of receiving and dispatching at 400 quilts of this data source and sink can preferentially be transmitted.
Below, imagination is looked in the audio frequency delivery service at certain, and television set 405 (STB402) sends a plurality of DNS apply for information before server 600 receiving data streams.For example, imagination is being enjoyed by television set 405 (STB402) when looking the audio frequency delivery service, and television set 405 (STB402) is visited portal server (the 1st external device (ED)) at first, and then access plane is to the portal server (the 2nd external device (ED)) of television set.
About above-mentioned portal server, for example imagining it is the server that the initial portal website that visits provides when STB402, television set 406 started.Perhaps, imagine above-mentioned portal server and for example be, to the user in order to enjoy the server that the portal website of looking the audio frequency delivery service and will visit at first provides.And the Service name of audio frequency delivery service etc. is looked in imagination meeting demonstration in this portal website, thereby makes the user can select to look the audio frequency delivery service.Perhaps, imagination can show in this portal website looks the thumbnail of looking audio content that the audio frequency delivery service provides etc., thereby makes the user can select to look audio content.
Corresponding those situations, the communication repeating device that illustrates in the present embodiment possesses preferential transmission controlled function, by this preferential controlled function that transmits, can preferentially transmit by looking the packet that audio frequency delivery server 603 sends to television set 405 (STB402), on the other hand, preferentially do not transmit by looking the packet that audio frequency delivery server 603 sends to PC403.Below, the communication repeating device that will have the present embodiment of preferential transmission controlled function abbreviates " relay " as.
According to Figure 23 one embodiment of the present invention is described below.For convenience of explanation, about with execution mode 1 or execution mode 2 in the identical device of device that illustrated, omit its related description.And, about having the parts of identical function with each parts shown in execution mode 1 or the execution mode 2, the label identical to its remarks, and omit its related description.Equally, about with execution mode 1 or execution mode 2 in the identical processing of processing that illustrated, also omit its related description.
Described in the present embodiment " DNS detects processing " is different processing with " DNS detects processing " described in the execution mode 2.What in the present embodiment, described " DNS detects processing " was represented is " DNS detects processing " of present embodiment.
" packet ", " data flow " and " video/audio data flow " these terms about using in the present embodiment in addition, it is identical with the definition described in the execution mode 1 separately.And identical with execution mode 1, the PLC network of imagination present embodiment is to use the LAN of the PLC that follows the HomePlugAV specification.
(data source and sink from request msg to the flow process summary that receives till the data)
Below, with reference to Figure 23, in the communication control system shown in Figure 20, STB402 plays from the summary of looking the flow process till audio frequency delivery server 603 receiving audio datas from the request video/audio and describes.Figure 23 is that model utility is represented in the communication control system shown in Figure 20, and STB402 plays the sequence chart of the flow process example till the receiving audio data from the request video/audio.
Execution mode 1 is with the difference of execution mode 2, and PLC adapter 311 and PLC adapter 312 only when (the 1st scheduled period) detects 2 DNS answer message in (tW millisecond) at the fixed time, just carry out priority data generation processing.
At first, STB402 is after having accepted audiovisual and having looked user's operation of audio content, with before portal server is connected, send the 1st DNS apply for information (to call " 1DNS apply for information " in the following text) (step S421) to HGW121 earlier in order to inquiry portal server IP address.
Then, the above-mentioned 1DNS apply for information of PLC adapter 312 relayings in the path.At this, PLC adapter 312 monitors all packets of himself institute's relaying, that is, constantly carry out DNS and detect and handle.But because not being DNS, above-mentioned 1DNS apply for information do not detect the detected object of handling, so do not carry out above-mentioned detection (step S422).DNS about present embodiment detects the detailed process of handling, and will illustrate afterwards.
Same, PLC adapter 311 also carries out DNS and detects processing, but because above-mentioned 1DNS apply for information is not a detected object, so do not carry out above-mentioned detection.PLC adapter 311 passes on above-mentioned 1DNS apply for information (step S423) to HGW121.
Then, after HGW121 has received the DNS apply for information, carry out handling with the corresponding DNS of the DNS apply for information of this reception.That is to say, if in HGW121, managed the corresponding IP of the domain name address of being inquired, just to STB402 transmission corresponding D NS answer message with institute.If do not manage the corresponding IP of the domain name address of being inquired, just to dns server 601 transmission DNS apply for information (step S424) with institute at HGW121.
Dns server 601 foldbacks and 1DNS apply for information are corresponding, the 1st corresponding D NS answer message (to call the 1DNS answer message in the following text) (step S425).HGW121 sends above-mentioned DNS answer message (step S424) to the STB402 as inquiry side after receiving above-mentioned DNS answer message.
Then, PLC adapter 311 relayings in the path are from the above-mentioned 1DNS answer message of HGW121.As mentioned above, detect to handle because PLC adapter 311 carries out DNS, what therefore this moment, PLC adapter 311 was detected is the DNS answer message.And, also detect as the domain name of inquiry object and predefined domain name 1 whether consistent (step S426).
PLC adapter 312 carries out DNS too and detects processing (step S427).
Thereafter, the STB402 that has received above-mentioned 1DNS answer message in order to inquire towards the IP address of the portal server of television set, sends the 2nd DNS apply for information (to call " 2DNS apply for information " in the following text) to HGW121 after having carried out predetermined processing.
(step S428～S430) identical with the described processing of step S422～S424 is so omit its related description in the processing that PLC adapter 322, PLC adapter and HGW121 have been carried out when having received the 2DNS apply for information.
Then, dns server 601 foldbacks and 2DNS apply for information are corresponding, the 2nd corresponding D NS answer message (to call " 2DNS answer message " in the following text) (step S431).
PLC adapter 311 and PLC adapter 312 in the path receive above-mentioned 2DNS answer message from HGW121.PLC adapter 311 and PLC adapter 312 detect to handle by DNS separately and detect the DNS answer message.Also detect as the domain name of inquiry object and pre-set domain name 2 whether consistent (step S432, S434).
At this moment, after PLC adapter 311 and PLC adapter 312 have detected above-mentioned 1DNS answer message separately,, just carry out priority data and generate processing (step S433, S435) if detect above-mentioned 2DNS answer message again in (tw millisecond) at the fixed time.
At this, the above-mentioned scheduled time (tw millisecond) is included in the predefined clauses and subclauses, and these clauses and subclauses are stored to QoS object storage portion 222.Or the above-mentioned scheduled time also can be regular time.
Generate in the processing at priority data, as implement mode 2 described, generation is in order to being sent to the packet of STB402 and being sent to from STB402 in the opposite direction that the packet of looking audio frequency delivery server 603 preferentially transmits, priority data from looking audio frequency delivery server 603.About priority of data packets, use pre-set value equally.
About having received the STB402 of 2DNS answer message, play processing (step S436～S442) identical till its receiving audio data bag with execution mode 2 described processing from its request data package that sends video/audio.PLC adapter 311 and PLC adapter 312 carry out packet and preferentially transmit processing separately according to the priority data that generates among step S433 and the S435.
Flow process by above explanation, the user enjoy towards television set, STB provide look the audio frequency delivery service time, particularly can be on PLC network 501, preferentially to request data package, video/audio bag, control data bag these the transceive data bag transmits between audio frequency delivery server 603 and the STB402 looking.Thus, can preferentially transmit the corresponding data stream of looking the audio frequency delivery service that provides towards television set, STB.
(structure of PLC adapter)
Be that with the difference of the PLC adapter of execution mode 2 the PLC adapter of present embodiment generates priority data when detecting 2 DNS answer message in the given time.To this, below the PLC adapter of explanation present embodiment structurally with the difference of the PLC adapter of execution mode 2.
QoS object storage portion 222 in the present embodiment is with QoS object storage portion 222 differences of execution mode 2, the domain name that comprises 2 servers that will preferentially transmit also comprises from detecting the 1DNS answer message and plays the higher limit that detects the time till the 2DNS answer message.QoS object storage portion 222 in the present embodiment for example can have the data structure shown in the table 9.That is to say, the clauses and subclauses that comprise the group of being made up of " domain name 1 ", " domain name 2 ", " time of delay ", " priority " are stored." domain name 1 " is the domain name of portal server, and " domain name 2 " is the domain name towards the portal server of television set." time of delay " be meant, plays the higher limit that detects the time (millisecond) till the 2DNS answer message from detecting the 1DNS answer message.
(table 9)
Figure BPA00001248535700751
The DNS test section 212 of present embodiment and the DNS test section 212 of execution mode 2 similarly, the packet that monitoring data packet transfer handling part 211 is passed on.And if learn that this packet is the packet of DNS answer message (1DNS answer message), whether " domain name 1 " in the domain name of just checking the inquiry object that this packet is contained and the items for information that QoS object storage portion 222 is managed be consistent.If find corresponding to items for information (to call " clauses and subclauses EN1 " in the following text), the packet that is then passed on then by the DNS test section 212 monitoring data packet transfer handling parts 211 of present embodiment.
Thereafter, if learn that this packet is the packet of DNS answer message (2DNS answer message) once more, whether " domain name 2 " among the domain name that the DNS test section 212 of present embodiment is just checked the inquiry object that this packet is contained and the clauses and subclauses EN1 be consistent.
If be consistent, just check from detecting the 1DNS answer message and play the time that detects till the 2DNS answer message.Then, the moment when detecting the 2DNS answer message, deduct the moment when detecting the 1DNS answer message,, just this advisory is generated handling part 213 to priority data if this value that subtracts calculation is shorter than the time shown in the value of " time of delay " row among the clauses and subclauses EN1.Then, priority data generates the value that handling part 213 utilizes " priority " row among the clauses and subclauses EN1, generates priority data.
Clauses and subclauses with the 1st row in the table 9 are that example illustrates below.DNS test section 212 is corresponding from detecting with the 1DNS apply for information, the 1DNS answer message that contains " portal-x.jp " this domain name rises when being received, if in " 500 " millisecond, detect corresponding with the 2DNS apply for information, the 2DNS answer message that contains " tv.portal-x.jp " this domain name also is received, and just this advisory is generated handling part 243 to priority data.It is " 4 " that priority data generation handling part 243 just generates the pairing priority of expression domain name " tv.portal-x.jp ", priority data.
In addition, the moment when detecting the 1DNS answer message and the value that obtains about deducting the moment when detecting the 2DNS answer message, if this value is longer than the time shown in the value of " time of delay " row, illustrate that then the spended time till playing when detecting the 1DNS answer message when detecting the 2DNS answer message is too much, do not notify so do not generate handling part 243 to priority data.In addition,, and just detect the 2DNS answer message, also do not generate handling part 243 and notify to priority data if do not detect the 1DNS answer message.
The QoS object storage portion 222 of present embodiment can also comprise " DNS inquires kind ".For example, QoS object storage portion 222 can have the data structure shown in the table 10.In the data structure shown in the table 10, include " classification 1 " (the 1st requires kind) and " classification 2 " (the 2nd requires kind) as DNS inquiry kind.
" classification 1 " is the kind of contained DNS inquiry in the 1DNS apply for information.And " classification 2 " is the kind of contained DNS inquiry in the 2DNS apply for information.In table 10, " A " is the value (value in the packet of DNS apply for information is " 1 ") that is endowed when request foldback IPv4 address.In addition, " AAAA " is the value (value in the packet of DNS apply for information is " 28 ") that is endowed when request foldback Ipv6 address.
(table 10)
Figure BPA00001248535700761
During as above-mentioned situation, when DNS test section 212 detects the DNS answer message by DNS detection processing, except detect as the domain name of inquiry object and pre-set domain name whether consistent, also detect DNS and inquire kind and pre-set classification whether consistent (domain name/request kind extraction unit).And, if detect 2 DNS answer message in (millisecond) at the fixed time, just this advisory is generated handling part 243 to priority data.
Clauses and subclauses with the 1st row in the table 10 are that example describes below.DNS test section 212 is corresponding from detecting with the 1DNS apply for information, the 1DNS answer message that contains domain name " portal-x.jp " and DNS inquiry kind " A " rises when being received, if in " 500 " millisecond, detect corresponding with the 2DNS apply for information, the 2DNS answer message that contains domain name " tv.portal-x.jp " and DNS inquiry kind " A " also has been received, just this advisory is generated handling part 243 to priority data.It is " 4 " that priority data generation handling part 243 just generates the pairing priority of expression domain name " tv.portal-xjp ", priority data.
In table 10, imagination " portal-y.tv " this domain name is the domain name of portal server, and " auth.portal-y.tv " this domain name is the domain name of certificate server of authentication of conducting interviews.In addition, the 1st domain name of imagining in the 3rd clauses and subclauses of going " www.portal-z.cojp " (classification A) is the domain name of IPv4 with portal server, and the 2nd domain name " www.portal-z.co.jp " (classification AAAA) is the domain name of IPv6 with portal server.
In the explanation of above-mentioned execution mode, when after detecting the 1DNS answer message, detecting the 2DNS answer message again, carry out priority data and generate processing.Yet, also can with the sequence independence of the DNS answer message that is detected, that is, when in certain time interval, detecting 2 DNS answer message, also can carry out priority data and generate handle.In addition, also can be not when detecting 2 DNS answer message, but when the DNS answer message that detects more than 3, carry out priority data and generate and handle.
In description of the present embodiment,, also can realize those processing by HGW121 as communication control unit though be to carry out above-mentioned DNS by PLC adapter to detect processing and priority data generation processing as relay.
(execution mode 4)
In the explanation of above execution mode, priority data generates handling part 213 when generating priority data, specifies to make transmit leg IP address and transmission IP address, destination and priority have corresponding relation.But be not limited to this structure example.
Priority data generates handling part 213 when generating priority data, also can specify to make transmit leg MAC Address and transmission destination MAC Address and priority have corresponding relation.For example, can not use table 6, and use the priority data shown in table 11 or the table 12.
If it is the packet of receiving from the Ethernet side joint that DNS answers packet, just generate the priority data shown in the table 11 (from looking the direction of audio frequency delivery server 603) to STB402.
If it is the packet that receives from PLC network 501 that DNS answers packet, just generate the priority data shown in the table 12 (from STB402 to the direction of looking audio frequency delivery server 603).
(table 11)
Figure BPA00001248535700781
(table 12)
Figure BPA00001248535700782
For example illustrate that the transmit leg MAC Address of detected DNS answer message is the MAC Address of HGW121 among step S406 and the step S408, and the transmission destination MAC Address of this DNS answer message is the MAC Address of STB402 with reference to Figure 21.Therefore, in step S407, priority data generates handling part 213 and generates: satisfying the MAC Address that the transmit leg MAC Address is HGW121 and sending the destination MAC Address is the MAC Address of STB402, priority data.In addition, in step S408, priority data generates handling part 213 and generates: satisfying the MAC Address that the transmit leg MAC Address is STB402 and sending the destination MAC Address is the MAC Address of HGW121, priority data.
Thus, the priority data shown in packet priority storage part 223 storage lists 13 of PLC adapter 311.In addition, the priority data shown in packet priority storage part 223 storage lists 14 of PLC adapter 312.At this, the MAC Address of establishing the STB402 in the present embodiment is " 00-11-11-11-11-11 ", and the MAC Address of HGW121 is " 00-22-22-22-22-22 ".
(table 13)
The transmit leg MAC Address Send the destination MAC Address Priority
?00-22-22-22-22-22 00-11-11-11-11-11 5
(table 14)
The transmit leg MAC Address Send the destination MAC Address Priority
?00-11-11-11-11-11 00-22-22-22-22-22 5
Below the packet of explanation present embodiment preferentially transmits handling part 214.Packet preferentially transmits handling part 214 at first from packet passes on the packet that handling part 211 desires will pass on, the header that extracts the transmit leg MAC Address and send destination MAC Address etc.
Then, from the clauses and subclauses of packet priority storage part 223, the value that extracts " transmit leg MAC Address " row is consistent with the transmit leg MAC Address of said extracted, and the value of " sending the destination MAC Address " row is consistent, clauses and subclauses with the transmission destination MAC Address of said extracted.If these clauses and subclauses fail to extract, packet passes on handling part 211 and just passes on this relevant packet according to the priority of acquiescence.If these clauses and subclauses are extracted out, packet passes on handling part 211 and just obtain " priority " from the clauses and subclauses that are extracted out, and passes on this relevant packet according to " priority " that this is obtained.
Just transmit the packet that sends to STB402 from HGW121 with priority " 5 " if exist priority data as shown in table 13, the packet of PLC adapter 311 to pass on handling part 211.Just transmit the packet that sends to HGW121 from STB402 with priority " 5 " if exist priority data as shown in table 14, the packet of PLC adapter 312 to pass on handling part 211.
(why specifying MAC Address to generate the reason of priority data)
About specifying MAC Address to set this method of " priority data ", it is compared with the method that the assigned ip address is set, and sets priority though can't look the audio frequency delivery server by each, and is more favourable in the following areas.
That is, the domain name of looking the audio frequency delivery server is probably changing in the future, or is added.For the correspondence trend of looking the audio frequency delivery service in the future, need to upgrade the items for information in the QoS object storage portion 222.No matter be that the user upgrades items for information, still upgrade items for information by the upgrading of firmware, it all needs to carry out the renewal of items for information.
To this, be the domain name of portal server if the items for information in the QoS object storage portion 222 is set for, rather than look the domain name of audio frequency delivery server, just might need not to carry out the renewal of items for information.Its reason is that portal server is that STB or TV are difficult at the initial server that connects, and the possibility that the domain name of portal server in future change takes place is lower.
STB or TV at first connect to portal server, thereafter from portal server, via link to looking audio frequency delivery server request video/audio.The PLC adapter need not to learn in advance the domain name of looking the audio frequency delivery server.Therefore, as long as learn the domain name of portal server in advance, even look the domain name of audio frequency delivery server so in the future change has taken place, also can alignment processing.
What server no matter looks the audio frequency delivery server is, at video/audio by when looking the audio frequency delivery server and be sent to STB402, be via HGW121.
When STB402 passed on the video/audio bag, the transmit leg MAC Address of this video/audio bag was set to the MAC Address of HGW121 from HGW121, and the transmission destination MAC Address of this video/audio bag is set to the MAC Address of STB402.Thus, by specifying MAC Address in advance and setting " priority data ", the data that flow between HGW121 and STB402 are just preferentially transmitted.
As long as the HGW121 device itself does not change, the MAC Address of HGW121 is just certain.Therefore, preferentially transmit to handle based on the packet of the MAC Address of HGW121 and have advantages such as need not to carry out edition upgrading.
In addition, the priority of storage also can only have corresponding relation with the MAC Address that sends the destination device in the packet priority storage part 223.That is, also can from the structure shown in table 13 and the table 14, remove " MAC Address of sending method, device " row.At this moment, preferentially transmit in the processing, be only judge or deny preferential transfer data packets based on the MAC Address of the transmission destination device of packet at packet.Therefore, the packet that sends to data source and sink 400 from HGW121 device in addition also can become the object of preferential transmission.For example, just also become the object of preferential transmission to the video/audio data flow of TV 405 transmissions via PLC adapter 311,312,313 from the DLAN server of premises setting.
(remarks item)
About the function in order to preferential transmission data that illustrates in the above-mentioned execution mode, communication control unit 100,120 also can possess this function, and relay 300,310 also can possess this function.That is, each parts of being possessed of the control part 10 of HGW101 illustrated in fig. 1 and storage part 20 can be the structures that has in the PLC adapter 301,302,303.Equally, each parts of being possessed of the control part 210 of PLC adapter 311 illustrated in fig. 22 (312,313) and storage part 220 can be the structures that has among the HGW121.
In the explanation of above-mentioned execution mode, HGW101 possesses DNS handling part 12, but is not limited thereto.HGW101 not necessarily will possess DNS handling part 12, and DNS handling part 12 also can be used as external device (ED), is connected with HGW101 can communicate mode (for example being situated between by Ethernet).
In addition, in above-mentioned execution mode 1 and execution mode 2, receive the processing (reception begins to handle) when looking audio content to start with, data source and sinks such as STB402 400 to the dns server of acquiescence are, HGW101 sends the DNS apply for information of looking the IP address of audio frequency delivery server 603 in order to inquiry, HGW101 carries out priority data according to the domain name that comprises in the above-mentioned DNS apply for information and generates processing, but be not limited to this mode, HGW101 also can be according to the DNS apply for information at other servers, carry out priority data and generate processing, at this, these other servers are meant, are beginning to receive other servers of being visited before looking audio content.For example, data source and sink 400 sends the DNS apply for information in order to the IP address of inquiry portal server, and HGW101 can carry out priority data generation processing according to the domain name that comprises in the above-mentioned DNS apply for information then.At this, for example can imagine above-mentioned portal server and be, to the user enjoy when looking the audio frequency delivery service the server that provides of the portal website that will visit at first.Thumbnail of looking audio content of looking in the audio frequency delivery service to be provided etc. is provided in this portal website imagination, thereby the user can select to look audio content.
Though look the domain name of audio frequency delivery server might be subjected to because of the reason of serving the provider append, eliminate, modification such as change, the domain name of portal server can be modified hardly.In general, when dispatching from the factory, stored the domain name of portal server in the data source and sink 400, when energized, data source and sink 400 can conduct interviews to this domain name, and shows web portal pages to the user at first, then by user's chosen content in this portal website.If the domain name of portal server is changed, so when connecting the power supply of data source and sink 400, portal website just method shows, but is shown as mistake, so user convenience can obviously descend.Though can wait the domain name that changes the portal server of login in the data source and sink 400 by the renewal of data source and sink 400, not all user can upgrade, therefore serve the also difficult domain name that changes portal server of provider.By comparison, the domain name of looking the audio frequency delivery server be when the user comes chosen content by portal website determined, therefore even change takes place and does not also have big problem in the domain name of portal website.
When change takes place in the domain name of looking the audio frequency delivery server, if this domain name after changing is not the domain name of storage in the QoS object storage portion 22, for the packet that portal server sent out, just can not impose the packet priority change and handle with above-mentioned domain name after changing.Therefore, the domain name of the portal server that not conference can be modified generates processing and the processing of packet priority change as the value in QoS object storage portion 22, packet priority storage part 23, server address storage part 21 " domain name " row separately thereby carry out priority data.
In addition, because the IP address of portal server is different with the IP address of looking the audio frequency delivery server of actual transmission video/audio bag, therefore, if on setting, the packet that IP address with the IP address of portal server and data source and sink 400 is matched preferentially is transmitted, and just can preferentially not transmitted from looking the video/audio bag that the audio frequency delivery server sends to data source and sink 400 so.When this situation, only can consider to judge whether preferentially to transmit according to the IP address of data source and sink 400.But this moment, the packet that data source and sink 400 receives (or transmission) all can preferentially be transmitted, also preferentially transmitted thereby cause originally need not the preferential packet (the Web data that for example data source and sink 400 received etc.) that transmits, caused the decrease in efficiency of the QoS control on all.
In addition, when the audiovisual of looking audio frequency was interrupted or finish, data source and sink 400 can be visited portal server substantially, thereby turns back to the content choice picture.At this moment, if on mounting structure be, data source and sink 400 all sent the DNS apply for information to this server at every turn before access server, and then data source and sink 400 can repeatedly send the DNS apply for information in order to the IP address of inquiry portal server.Therefore, for the data source and sink 400 that does not carry out the DNS inquiry more than the certain hour to portal server, HGW can remove this data source and sink 400 (that is, eliminating the clauses and subclauses shown in table 4, the table 6) from the QoS object.Thus, can be only remove from the QoS object no longer receiving the data source and sink 400 of looking audio frequency, so 400 bandwidth that can use of other data source and sinks just are increased, the QoS efficient on network is all just is improved.
In addition, in the explanation of above-mentioned execution mode, whether the packet no matter HGW101 will pass on has been set priority, all handles by the packet priority change and upgrades the packet priority that this will pass on, but be not limited to this mode.That is, for example,, also can not carry out the change of data packet priority and handle if paid priority of data packets in server 600 grades.
In addition, can set whether will handle the overwrite priority of data packets by the user by predetermined interface by the packet priority change.For example, can make the user set picture 162 and change this setting by QoS object setting picture 161 or QoS object.
In addition, (for example also can newly append the policy management capability that manages in order to strategy (policy) to QoS, can make HGW101 comprise this policy management capability, or the external device (ED) with this policy management capability is connected in the mode that can communicate by letter with HGW101), and judge whether to want the overwrite priority of data packets by this policy management capability.About above-mentioned policy management capability, for example can carry out above-mentioned judgement according to the set information of the whether overwrite priority of data packets of setting by each service.
Because of the difference of service, in order to carry out the QoS control based on DSCP in the 2nd communication network 700, server 600 is set predetermined value sometimes and is sent in the dscp field of packet.In this case, if serve among DSCP value that the provider sets and the present invention variantly, just might take place bad by the DSCP that HGW101 upgraded.For example, if be updated to than serving the low priority of the contemplated priority of provider, the disorder of video or audio frequency may take place in data source and sink 400 just.If DSCP value just has been configured to certain value HGW101 desires to pass on before, otherwise the DCSP value is upgraded, just can avoid above-mentioned problem.
In addition, though the relative importance value of narrating in the above-described embodiment the video/audio bag that belongs to video/audio data flow changes, also can change the priority of data packets that belongs to any data flow.For example, in audio communications services, can the priority of data packets that belong to the video data stream that sends with VoIP be changed.The packet that belongs to audio data stream generally transmits with the priority that is higher than video packets of data.In addition, with regard to the HomePlugAV specification, the DSCP value of electing the affiliated packet of audio data stream is 6 (that is, for the packet that transmits in the PLC network, the value of its CAP is 3).
In addition, in above-mentioned execution mode 1,, also can represent priority of data packets by other fields though be that dscp field by rewrite data bag in HGW101 imposes preferential control QoS.For example can use the preferential label of VLAN (priority tag).
In addition, in above-mentioned execution mode 1, though be that dscp field by rewrite data bag in HGW101 imposes preferential control QoS, the rewriting of the dscp field in the packet also can be undertaken by other devices.For example, can rewrite by relays 300 such as PLC adapter or wireless lan adapters.At this moment, HGW101 finds out by method same with the above-mentioned embodiment becomes the data flow that QoS sets object, and the information of this data flow is notified to PLC adapter or wireless lan adapter, to be substituted in the information of this data flow of storage in the packet priority storage part.PLC adapter or wireless lan adapter are preserved this information in advance, and after during the transfer of data bag, by with above-mentioned execution mode in the same processing of packet priority change handling part upgrade dscp field, send to PLC network or wireless lan network thereafter.
In addition, in above-mentioned execution mode 1,, also can point out the QoS object to relay 300 transmission information such as PLC adapter or wireless lan adapters though be to implement preferentially to control QoS by the dscp field of rewrite data bag in HGW101 in advance.For example, HGW101 finds out by method same with the above-mentioned embodiment becomes the data flow that QoS sets object, and will and send destination IP address notification in order to the transmit leg IP address of discerning this data flow to PLC adapter or wireless lan adapter etc., to be substituted in the information of this data flow of storage in the packet priority storage part.At this moment, can also notify the information of the priority of this data flow simultaneously.PLC adapter or wireless lan adapter are preserved this information in advance, and after during the transfer of data bag, IP address to packet is analyzed, if the IP address of being prenoticed with HGW101 coincide, just this packet is preferentially sent to PLC network or wireless lan network as the QoS object.If prenoticed priority this moment, also can carry out QoS and transmit according to this priority.
In addition, in above-mentioned execution mode 1, HGW101 can preferentially control transmission when sending packet, transmits but also can not carry out preferential control.That is, HGW101 also can only carry out the rewriting of dscp field.
About above-mentioned execution mode, remove the above, can also be expressed as follows.Promptly, communication control unit of the present invention is collected the address request signal that includes the dispensing device domain name from receiving system, decide priority according to the domain name that comprises in the above-mentioned address request signal, and obtain the address of above-mentioned dispensing device according to the domain name that comprises in the above-mentioned address request signal, also obtain the address of above-mentioned receiving system, setting the above-mentioned priority that determines for from the priority of data packets that above-mentioned dispensing device is sent to above-mentioned receiving system according to the sender address of above-mentioned address request signal.
About execution mode 2～4, remove the above, can also be expressed as follows.
(1) relay of the present invention is the relay that packet is carried out relaying, above-mentioned relay possesses QoS object storage portion, domain name addresses solves packet test section (DNS test section), priority data generates handling part, packet priority storage part, packet preferentially transmits handling part, the storage of above-mentioned QoS object storage portion becomes the domain name that QoS sets object, above-mentioned domain name addresses solves the packet test section when the packet that detects above-mentioned institute relaying is domain name addresses solution packet, judge inquiry object domain name that above-mentioned domain name addresses solves packet whether with above-mentioned QoS object storage portion in the above-mentioned domain name of storing match, if coincide, just notify above-mentioned priority data to generate handling part, after above-mentioned priority data generation handling part confirms the existence of the domain name addresses solution packet that matches with above-mentioned domain name, from above-mentioned domain name addresses solution packet, extract address information, and generation comprises the priority data of the address information of said extracted, the priority data of the above-mentioned generation of above-mentioned packet priority storage portion stores, above-mentioned packet preferentially transmit packet that handling part judges above-mentioned institute relaying whether with above-mentioned packet priority storage part in the priority data stored match, if coincide, the just preferential above-mentioned packet of relaying.
(2) relay of the present invention is the relay that packet is carried out relaying, above-mentioned relay possesses QoS object storage portion, domain name addresses solves packet test section (DNS test section), priority data generates handling part, packet priority storage part, packet preferentially transmits handling part, the storage of above-mentioned QoS object storage portion becomes the 1st domain name and the 2nd domain name that QoS sets object, above-mentioned domain name addresses solves the packet test section when the packet that detects above-mentioned institute relaying is domain name addresses solution packet, judge inquiry object domain name that above-mentioned domain name addresses solves packet whether with above-mentioned QoS object storage portion in above-mentioned the 1st domain name and the 2nd domain name of storing match, if coincide, just notify above-mentioned priority data to generate handling part, after above-mentioned priority data generates that handling part confirms that the 1st domain name addresses that matches with above-mentioned the 1st domain name solves packet and solves the two existence of packet with the 2nd domain name addresses that above-mentioned the 2nd domain name matches, from the above-mentioned the 1st and the 2nd domain name addresses solution packet, extract address information, and generation comprises the priority data of the address information of said extracted, the priority data of the above-mentioned generation of above-mentioned packet priority storage portion stores, above-mentioned packet preferentially transmit packet that handling part judges above-mentioned institute relaying whether with above-mentioned data priority storage part in the priority data stored match, if coincide, the just preferential above-mentioned packet of relaying.
(3) in addition, in relay of the present invention, above-mentioned priority data generates handling part, and to solve the address information of extracting the packet from above-mentioned domain name addresses can be the corresponding address that is solved the domain name that packet solved by above-mentioned domain name addresses.
(4) in addition, in relay of the present invention, it can be to send or receive the address that above-mentioned domain name addresses solves the device of packet that above-mentioned priority data generation handling part solves the address information of extracting the packet from above-mentioned domain name addresses.
(5) relay of the present invention is the relay that packet is carried out relaying, above-mentioned relay possess DNS test section, priority data generate handling part, packet preferentially transmit handling part,
QoS object storage portion, packet priority storage part, when above-mentioned DNS test section is the DNS packet at the packet that detects above-mentioned institute relaying, domain name in the items for information whether the inquiry object domain name of judging above-mentioned DNS packet is stored with above-mentioned QoS object storage portion matches, if coincide, just notify above-mentioned priority data to generate handling part, above-mentioned priority data generates handling part according to the above-mentioned items for information of storing in above-mentioned DNS packet and the above-mentioned QoS object storage portion that coincide, generate priority data, and the priority data of above-mentioned generation is stored to above-mentioned packet priority storage part, above-mentioned packet preferentially transmit packet that handling part judges above-mentioned institute relaying whether with above-mentioned packet priority storage part in the priority data stored match, if coincide, just according to the priority of the above-mentioned priority data that coincide, the preferential above-mentioned packet of relaying.
(6) sent the 1st requirement of asking at data sink in order to the mailing address of the 1st external communication device that belongs to the 1st domain name, and received the answer of the 1st requirement by communication control unit after, 2nd requirement of transmission in order to the mailing address of the 2nd external communication device that belongs to the 2nd domain name is asked, then, sent to data sending device in order to the data flow that is made of a plurality of communication data packet is asked the 3rd when requiring, as the 3rd answer that requires, be situated between to send the above-mentioned communication data packet that is included in the above-mentioned data flow by above-mentioned data sending device to above-mentioned data sink by above-mentioned communication control unit, this packet of relaying when relay of the present invention is controlled this communication data packet, in relay of the present invention, the above-mentioned the 1st answer that requires includes: the 1st domain name is the title of above-mentioned the 1st domain name under the said external device; The address of said external device; Represent that the 1st of the above-mentioned the 1st classification that requires requires classification, the above-mentioned the 2nd answer that requires includes: the 2nd domain name is the title of above-mentioned the 2nd domain name under the above-mentioned data sending device; The mailing address of above-mentioned data sending device; Represent that the 2nd of the above-mentioned the 2nd classification that requires requires classification; The physical address of above-mentioned communication control unit; The physical address of above-mentioned data sink, possess: domain name/require classification extraction unit, from the above-mentioned the 1st answer that requires, extract above-mentioned the 1st domain name and the above-mentioned the 1st and require classification, also from the above-mentioned the 2nd answer that requires, extract above-mentioned the 2nd domain name and the above-mentioned the 2nd and require classification; The 1st storage part is stored above-mentioned the 1st domain name, the above-mentioned the 1st and is required classification, above-mentioned the 2nd domain name, the above-mentioned the 2nd to require the transmission priority of classification, above-mentioned communication data packet, and makes them corresponding mutually when storage; Domain name priority obtains the unit, from above-mentioned the 1st storage part, obtain, require classification, above-mentioned the 2nd domain name, the corresponding transmission priority of the above-mentioned the 2nd group that requires classification to form with above-mentioned the 1st domain name of extracting by above-mentioned domain name/require classification extraction unit, the above-mentioned the 1st; The priority data generation unit, group that the MAC Address by the MAC Address of above-mentioned communication control unit and above-mentioned data sink that comprises in the above-mentioned the 2nd answer that requires is formed and above-mentioned territory priority obtain the obtained transmission priority in unit and deposit accordingly mutually to the 2nd storage part, in each communication data packet that constitutes above-mentioned data flow, comprise the transmit leg MAC Address of this communication data packet and the transmission destination MAC Address of this packet, also possess: sender address/transmission destination-address extraction unit, from the above-mentioned communication data packet that constitutes above-mentioned data flow, extract above-mentioned transmit leg MAC Address and above-mentioned transmission destination MAC Address; Packet priority obtains the unit, about the MAC Address of the above-mentioned transmit leg that extracts by above-mentioned sender address/transmission destination-address extraction unit and the MAC Address of above-mentioned transmission destination, from above-mentioned the 2nd storage part, obtain and the corresponding transmission priority of forming by the MAC Address of the MAC Address of this transmit leg and this transmission destination of group; The packet transmit control unit is obtained the obtained above-mentioned transmission priority in unit according to above-mentioned packet priority, and control transmits the above-mentioned communication data packet that constitutes above-mentioned data flow.
(7) relay of the present invention is controlled the transmission of above-mentioned communication data packet contained in the data flow that is made of a plurality of communication data packet, and this communication data packet is carried out relaying.In this relay, the requirement that relaying sends from data sink in order to the mailing address of the external device (ED) that is subordinated to domain name is asked, also relaying is to the response at above-mentioned request of above-mentioned data sink transmission, wherein, include the domain name in the affiliated territory of said external device in this response, the expression information of the transmit leg of this response, the expression information of the transmission destination of this response, possess: domain name/transmission information extraction unit, when detecting this relay and want the communication data packet of relaying to be the communication data packet of above-mentioned response, from above-mentioned response, extract the domain name of said external device, the expression information of the transmit leg of this response, the expression information of the transmission destination of this response; The 1st storage part, the domain name of storage said external device and will be set transmission priority to above-mentioned communication data packet, and when storage, make this domain name and this transmission priority correspondence mutually; Territory priority obtains the unit, obtains the corresponding transmission priority of domain name with above-mentioned domain name/said external device that the transmission information extraction unit is extracted from above-mentioned the 1st storage part; The priority data generation unit, the group that storage is made up of the expression information of the transmission destination of the expression information of the transmit leg of above-mentioned domain name/above-mentioned response that the transmission information extraction unit is extracted and this response, and above-mentioned territory priority obtains the obtained transmission priority in unit, and when storage, make this group corresponding mutually with this transmission priority, in the above-mentioned communication data packet that constitutes above-mentioned data flow, the expression information that includes the transmission destination of the expression information of transmit leg of this communication data packet and this communication data packet, also possess: caller information/transmission destination information extraction unit, from the above-mentioned communication data packet of this relay institute relaying, the expression information of the expression information of above-mentioned transmit leg and above-mentioned transmission destination; Packet priority obtains the unit, from above-mentioned the 2nd storage part, obtain and the corresponding transmission priority of being formed by the above-mentioned caller information/expression information of the above-mentioned transmit leg that transmission destination information extraction unit is extracted and the expression information of above-mentioned transmission destination of group; The packet transmit control unit is obtained the obtained above-mentioned transmission priority in unit according to above-mentioned packet priority, and the transmission of the above-mentioned communication data packet that constitutes above-mentioned data flow is controlled.
In addition,, remove the above, can also be expressed as follows about execution mode 2～4.
(8) relay of the present invention is the relay of relay data bag, and it possesses: QoS object storage portion, store the domain name that becomes the QoS object at least; Domain name/address solves data packet detecting unit unit, is domain name/address when solving packet detecting above-mentioned by the packet of relaying, judges that domain name that this detected domain name/address solves the inquiry object that comprises in the packet is whether consistent with the domain name of storing in the above-mentioned QoS object storage portion; Priority data generates processing unit, if the result of above-mentioned judgement is that the domain name of storing in domain name and the above-mentioned QoS object storage portion of above-mentioned inquiry object is consistent, just solve the packet from above-mentioned detected domain name/address and extract the address, and generate the priority data of the address comprise this extraction, and the priority data that will generate is deposited to packet priority storage part; Packet preferentially transmits processing unit, when the contained address in the above-mentioned priority data of above-mentioned the address that comprises in by the packet of relaying and above-mentioned packet priority storage portion stores is consistent, preferentially above-mentioned packet is carried out relaying.
(9) in addition, in relay of the present invention, the address that above-mentioned priority data generation processing unit adds in the above-mentioned priority data also can be to be solved the corresponding address of the domain name that packet solved by above-mentioned domain name/address.
(10) in addition, in relay of the present invention, the address that above-mentioned priority data generation processing unit adds in the above-mentioned priority data also can be to send or receive the address that above-mentioned domain name/address solves the device of packet.
In addition,, remove the above, can also be expressed as follows about each execution mode.
(11) relay of the present invention is the relay of relay data bag, and it possesses: QoS object storage portion, store the domain name that becomes the QoS object at least; Priority data generates processing unit, have domain name/address solution packet and obtain unit and domain name/address solution packet judging unit, this domain name/address solution packet is obtained the unit and is obtained the domain name/address solution packet that sends from other devices, whether this domain name/address solves domain name that the above-mentioned obtained domain name/address of packet judgment unit judges solves the inquiry object that comprises in the packet consistent with the domain name of storing in the above-mentioned QoS object storage portion, if the domain name of storing in the domain name that the result of above-mentioned judgement is above-mentioned obtained domain name/address solves the inquiry object that comprises in the packet and the above-mentioned QoS object storage portion is consistent, this priority data generates processing unit and just extracts the address from above-mentioned obtained domain name/address solution packet, and generate the priority data of the address comprise this extraction, and the priority data that will generate is deposited to packet priority storage part; Packet preferentially transmits processing unit, from above-mentioned by the packet of relaying, the corresponding to address, contained address in the above-mentioned priority data that includes with above-mentioned packet priority storage portion stores, packet transmits the object of handling as preferential, and preferentially transmits processing.
(12) in addition, in relay of the present invention, above-mentioned QoS object storage portion can store a plurality of domain names, be stored in each domain name in the above-mentioned QoS object storage portion for all, when the domain name of storing in judging domain name that the above-mentioned domain name that obtains/address solves the inquiry object that comprises in the packet and above-mentioned QoS object storage portion is consistent, above-mentioned priority data generates processing unit and extract the address from the above-mentioned domain name that obtains/address solves certain of packet, and generates the priority data of the address that comprises this extraction.
(13) in addition, in relay of the present invention, about above-mentioned by among the packet of relaying, include corresponding to address, contained address in the above-mentioned priority data with above-mentioned packet priority storage portion stores, packet, more than during if the non-relay state of this packet has continued necessarily, from above-mentioned packet priority storage part, eliminate above-mentioned priority data.
(14) in addition, in relay of the present invention, it can be the answer packet of inquiring at domain name that domain name/address that above-mentioned domain name/address solution packet receiving element is received solves packet.
(15) in addition, in relay of the present invention, above-mentioned domain name/address solves packet and obtains the packet that the unit can monitor this relay institute relaying, and obtains domain name/address solution packet from the packet of this relaying.
(15) in addition, in relay of the present invention, above-mentioned QoS object storage portion can store the domain name and the transmission priority that will be set to packet of the above-mentioned QoS of becoming object, and makes the domain name of this QoS object corresponding mutually with this transmission priority when storage; Handle as preferential transmission, above-mentioned packet preferentially transmits processing unit can be to the packet that becomes the object that preferential transmission handles, and sets the transmission priority of storing in the above-mentioned QoS object storage portion.
(16) in addition, in relay of the present invention, handle as preferential transmission, above-mentioned packet preferentially transmits processing unit can preferentially transmit the object that becomes preferential transmission processing in this relay packet.
(17) in addition, in relay of the present invention, above-mentioned priority data generates the address that processing unit adds in the above-mentioned priority data, solves the address that address that packet solved and/or the above-mentioned domain name that obtains/address solve the receiving system of packet by the above-mentioned domain name that obtains/address.
(18) in addition, in relay of the present invention, the address that above-mentioned priority data generation processing unit adds in the above-mentioned priority data also can be the address of the dispensing device of the above-mentioned domain name that obtains/address solution packet and/or the address that the above-mentioned domain name that obtains/address solves the receiving system of packet.
(19) in addition, in relay of the present invention, can further possess QoS object setup unit, so that the user can change canned data in the above-mentioned QoS object storage portion.
(20) in addition, in relay of the present invention, above-mentioned QoS object storage portion can store the title of the network that domain name the provided service of above-mentioned storage with the domain name of above-mentioned storage mutually accordingly.
(21) in addition, in relay of the present invention, QoS also can get rid of the domain name storage accordingly mutually of information and above-mentioned storage in above-mentioned QoS object storage portion, and wherein, whether above-mentioned QoS gets rid of information and the domain name of above-mentioned storage temporarily will be got rid of from the QoS object in order to expression.
At last, control part 10,110,210,810 can be by utilizing CpU (central processing unit: central processing unit) realize with software, also can be made of hardware logic.
When realizing with software, HGW101, HGW121, PLC adapter 301 (302,303), PLC adapter 311 (312,313), wireless lan adapter 801 (802,803) have: the CPU that the order of the control program of realizing each function is carried out; The ROM of storage said procedure; In order to launch the RAM of said procedure; Storage devices (recording medium) such as storage said procedure and various memory of data etc.In addition, to HGW101, HGW121, PLC adapter 301 (302,303), PLC adapter 311 (312,313), wireless lan adapter 801 (802,803) provide recording medium, this recording medium recording has and can be read by computer, HGW101, HGW121, PLC adapter 301 (302,303), PLC adapter 311 (312,313), wireless lan adapter 801 (802, the program code of control program 803) (execute form program, the intermediate code program, source program), described control program is the software that is used to realize the above function, by by HGW101, HGW121, PLC adapter 301 (302,303), PLC adapter 311 (312,313), wireless lan adapter 801 (802,803) Nei computer (or CPU, MPU (Micro Processing Unit: microprocessor)) reads and carries out the program code that writes down in this recording medium, also can realize purpose of the present invention.
About aforementioned recording medium, for example can be band classes such as tape, cartridge tape; It also can be the dish class that comprises CDs such as disks such as floppy disk (registered trade mark), hard disk and CD-ROM, MO, MD, DVD, CD-R; Also can be card classes such as IC-card (comprising storage card), light-card; Or semiconductor memory class such as mask-type ROM, EPROM, EEPROM, flash rom.
In addition, HGW101, HGW121, PLC adapter 301 (302,303), PLC adapter 311 (312,313), wireless lan adapter 801 (802,803) also can connect communication network, and the said procedure code also can provide by means of communication network.About above-mentioned communication network, not special restriction, for example, can utilize the Internet (internet), Intranet (intranet), extranet (extranet), LAN, ISDN, VAN, CATV communication network, VPN (virtual private network) (virtual private network), phone loop line network, mobile communications network, satellite communication network etc.In addition, about transmission medium in order to the formation communication network, not special restriction, for example, can utilize IEEE1394 line, USB line, power line, cable TV loop line, telephone wire, ADSL loop line etc. wired, also can utilize infrared ray, Bluetooth (registered trade mark), IEEE802.11 radio communication, HDR, mobile telephone network, satellite loop line, received terrestrial digital broadcasting network radio communications such as (terrestrial digital net) such as IrDA or remote controller etc.In addition, though the form of said procedure code be the mounting that is achieved with electric transmission in the computer data signal of carrier wave, also can realize the present invention.
The present invention is not limited to the respective embodiments described above, can carry out various changes according to the scope shown in the claim, suitably makes up the technological means of recording and narrating in the different execution modes and the execution mode that obtains also is contained within the technical scope of the present invention.
As previously discussed, relay of the present invention is the relay that the packet of receiving and dispatching is carried out relaying between data sending device and data sink, it possesses: QoS object storage portion, store the domain name in the affiliated territory of the above-mentioned data sending device that the QoS object data bag that becomes the QoS object is sent at least; Domain name/address solves packet and obtains the unit, domain name/address of obtaining in order to the address that solves above-mentioned data sending device solves packet, wherein, above-mentioned domain name/address solve the affiliated territory that comprises this data sending device in the packet domain name and, this data sending device, domain name/address solve the sending method, device of packet, domain name/address solves the transmission destination device of packet, above-mentioned data sink in those at least one side's address; The prior information generation unit, obtain domain name/address of obtaining the unit and solve the domain name of storing in domain name contained in the packet and the above-mentioned QoS object storage portion when consistent when above-mentioned domain name/address solves packet, extract above-mentioned domain name/address solution packet and obtain one or more contained addresses in domain name/address solution packet of obtaining the unit, and generate the address group that the address constituted by this extraction, and the address group that will generate is deposited to packet prior information storage part; The preferential delivery unit of packet, when when consistent, preferentially transmit above-mentioned preferential transmission and handle by the packet of relaying by certain address faciation of storing in the above-mentioned address group that one or more addresses constituted that comprises in by the packet of relaying and the above-mentioned packet prior information storage part.
Thus, can solve packet,, deposit to packet prior information storage part by the address group that the address constitutes that comprises in the packet that will preferentially transmit by utilizing QoS object storage portion and domain name/address.Therefore, after, when the address group that one or more addresses constituted that comprises in the packet by this relay relaying is consistent with address stored faciation in the packet prior information storage part, just can preferentially transmit above-mentioned by the packet of relaying.
That is, to the packet that data sink sent that this data sending device has been carried out the request that sends, can preferentially transmit the data flow of forming by this packet about the data sending device that has the domain name of storing in the QoS object storage portion.
Thus, for example imagine from domain name different respectively look that the audio frequency delivery server sends, use the data flow of content that identical negotiation agreement is arranged (for example high definition look audio content and the low audio content of looking clearly) same communication network, to be transmitted.Under this situation, if each data flow is all preferentially transmitted, then the transmission bandwidth of communication network can be not enough, at this moment, by the present invention, can be only the data flow that the audio frequency delivery server sends to data sink of looking of the domain name of storing be preferentially transmitted (for example, only the data flow of looking audio content to high definition transmits) from have QoS object storage portion, even therefore under above-mentioned condition, also can realize QoS.
In other words, can only preferentially transmit the data packets in data flows that needs the preferential content that transmits (high definition look audio content etc.), and preferentially do not transmit the data packets in data flows of other guide (low look clearly audio content etc.), so in the data sink that receives the data flow that is preferentially transmitted, the disorder in the time of can suppressing to look audio playback.
In addition, in relay of the present invention, when solving packet, above-mentioned domain name/address obtains certain domain name of storing in domain name that the unit comprises and the above-mentioned QoS object storage portion when consistent in obtained a plurality of above-mentioned domain name of the 1st scheduled period/address solves each of packet, above-mentioned prior information generation unit can be extracted in the above-mentioned domain name that above-mentioned the 1st scheduled period obtained/address solve packet certain or a plurality of in one or more addresses of comprising, and generate the address group that the address constituted by this extraction.
According to said structure, when certain domain name of storing in the domain name that comprises in a plurality of domain names that obtain in the 1st scheduled period/address solve each of packet and the QoS object storage portion is consistent, about the domain name that obtained in the 1st scheduled period/address solve packet certain or a plurality of in one or more addresses of comprising, depositing to packet prior information storage part by the address group that this one or more address constituted.
Therefore, about the domain name that obtained in the 1st scheduled period/address solve packet certain or a plurality of in one or more addresses of comprising, be being deposited by the address group that this one or more address constituted to the condition of packet prior information storage part: it is consistent that a plurality of domain names/address of obtaining of the 1st scheduled period solves certain domain name of storing in the domain name that comprises in each of packet and the QoS object storage portion.Say it on the contrary, if in the domain name that QoS object storage portion is stored, exist with a plurality of domain names that obtain in the 1st scheduled period/address and solve all inconsistent domain name of domain name that comprises in each of packet, then for solve by the domain name that obtains in the 1st scheduled period/address packet certain or a plurality of in the address group that the address constituted that comprises, this address group is not deposited to packet prior information storage part.
Thus, only when domain name/address of having obtained the domain name that a plurality of QoS of containing object storage portion stored in the 1st scheduled period solves packet, for after by among the packet of this relay institute relaying, include with above-mentioned a plurality of domain names that obtain/address solve packet certain or a plurality of in contained corresponding to address, address, packet, can control and whether it preferentially be transmitted.
Specifically describe for example at this.(1) imagination as the STB of data sink when receiving the data flow of the audio frequency delivery server of considering oneself as, at first visit in order to look the portal server that the audio frequency delivery server is connected, thereafter, visit according to the indication of portal server and to look the audio frequency delivery server, (2) on the other hand, imagination only conducts interviews to portal server as the PC of other data sinks.In addition, imagination portal server and the address of looking the audio frequency delivery server are to solve packet by domain name/address to notify.In these cases, at STB before look the audio server receiving data stream, what be transmitted is that two different domain names/address solves packet (domain name/address that comprises the address of portal server solves packet, and the domain name/address solution packet that comprises the address of looking the audio frequency delivery server).In contrast to this, before the pc access portal server, what be transmitted only is that domain name/address of containing the address of portal server solves packet.
In above-mentioned example, what the imagination relay preferentially transmitted is that STB is from looking the data flow that the audio frequency delivery server is received.At this moment, will look the domain name of audio frequency delivery server and the domain name of portal server in advance and be stored to QoS object storage portion.When domain name/address that the domain name that has obtained the address that includes portal server in the 1st scheduled period/address solves packet and includes the address of looking the audio frequency delivery server solves packet, owing to the domain name that contains in the domain name of storing in the QoS object storage portion and above-mentioned two domain names that the obtain/address solution packet is consistent, therefore, solving the address group that the address constituted that contains in certain of packet by above-mentioned obtained two domain names/address just is stored to packet prior information storage part.Therefore, after among the packet by this relay institute relaying, about solve the address group that the address constituted that contains in certain of packet by above-mentioned obtained two domain names/address, contain with the packet of the corresponding to address group of this address group (that is, from looking the data packets in data flows that the audio frequency delivery server sends to STB) and just can preferentially be transmitted.
On the other hand, by PC in the example of portal server visit, domain name/address of only obtaining the address of containing portal server in the 1st scheduled period solves packet.Therefore, to solve the domain name that comprises in the packet only consistent with the domain name of the folk prescription stored in the QoS object storage portion for this domain name that obtains/address.Therefore, solving the address group that the address constituted that contains in the packet by above-mentioned obtained domain name/address just can not be stored to packet prior information storage part.Therefore, among the packet of this relay institute relaying, solve the address group that the address constituted in the packet about domain name/address by above-mentioned obtained folk prescription, contain with the packet of the corresponding to address group of this address group (that is, from looking the data packets in data flows that the audio frequency delivery server sends to PC) and just can preferentially do not transmitted.
As previously discussed, solve packet and the data flow that sent, can control this data flow is preferentially transmitted about a plurality of domain names of containing the domain name of storing in the QoS object storage portion with transmitting-receiving/address.
In addition, in relay of the present invention, can also possess prior information and eliminate the unit, about this relay one or more packets at the 2nd scheduled period relaying, to with any packet in the address group that one or more addresses constituted that comprises all inconsistent, be stored in the above-mentioned address group in the above-mentioned packet prior information storage part, above-mentioned prior information is eliminated the unit and is eliminated.
According to said structure, about this relay one or more packets at the 2nd scheduled period relaying, for by among the address group that one or more addresses constituted that contains of certain packet, it is not eliminated from packet prior information storage part.And for the address group beyond this address group, it is eliminated from packet prior information storage part.
Therefore, for by the address group that one or more addresses constituted in the packet of the 2nd scheduled period relaying, this address group is eliminated from packet prior information storage part.
For example, when the transmission of the data flow that will preferentially transmit finished, the packet that belongs to this data flow just no longer was sent out, and relay also no longer carries out relaying to this packet.If this packet not in the 2nd scheduled period by relaying, the address group of storing in the packet prior information storage part in order to preferential this data flow of transmission just can be eliminated.
Therefore, the quantity that can prevent to be stored in the clauses and subclauses of packet prior information storage part constantly increases, thereby can be suppressed at the increase of the processing burden when packet prior information storage part retrieved.So can alleviate the processing burden that preferential transmission is handled.
In addition, in relay of the present invention, preferred above-mentioned domain name/address solves packet and can be, is sent out the packet to above-mentioned data sink as the answer that the inquiry of the address of above-mentioned data sending device has been done.
According to said structure, domain name/address solution packet is the answer packet at the inquiry of data sending device address, that is, be the answer packet of DNS.
At this, comprise at least in the above-mentioned answer packet: the domain name in affiliated territory of having been inquired the data sending device of address; As the inquiry address result, data sending device; The address of the transmission destination of above-mentioned answer packet.
Therefore, can use the answer packet of DNS to generate the address group that to deposit to packet prior information storage part.
In addition, in relay of the present invention, preferred above-mentioned domain name/address solves packet and is, the packet that sends out as the inquiry of the address of above-mentioned data sending device and from above-mentioned data sink.
According to said structure, it is in order to inquire the packet of data sending device address that domain name/address solves packet, that is, be the inquiry packet of DNS.
At this, comprise at least in the above-mentioned inquiry packet: as the domain name in the affiliated territory of the data sending device of address inquiry object; The address of the transmission destination of above-mentioned inquiry packet; The address of the transmit leg of above-mentioned inquiry packet.
Therefore, can use the inquiry packet of DNS to generate the address group that to deposit to packet prior information storage part.
In addition, in relay of the present invention, above-mentioned prior information generation unit can solve packet and obtain the obtained domain name in unit/address solution packet from above-mentioned domain name/address, the address of the transmission destination device of the address of the above-mentioned data sending device that extraction has been solved and this domain name/address solution packet, wherein at least one side, and generation is by the address group that the address constituted of this extraction.
According to said structure, can solve packet according to domain name/address and generate, wherein at least one side's of the address of the transmission destination device that solves packet by address and this domain name/address of the data sending device that has been solved the address group that the address constituted.
Therefore, among the packet of this relay institute relaying, that become object that preferential transmission handles is certain person in following: (1) from have by above-mentioned domain name/address solve packet obtain domain name/address of obtaining the unit solve address that packet solved, data sending device, send the packet that solves the transmission destination device of packet to the above-mentioned domain name that obtains/address; (2) solve the packet address, that data sending device sent out that packet solved (do not limit and send the destination) from having by the above-mentioned domain name that obtains/address; (3) be sent to the packet (not limiting transmit leg) that the above-mentioned domain name that obtains/address solves the transmission destination device of packet.
Thus, when the transmission destination device of domain name/address solution packet is data sink, can be with following packet as the preferential object of handling that transmits, that is: from solving packet and solved the data sending device of address, send packet to data sink by this domain name/address; The packet that sends out from data sending device (do not limit and send the destination); Be sent to the packet (not limiting transmit leg) of data sink.
In addition, in relay of the present invention, above-mentioned prior information generation unit can solve packet and obtain the obtained domain name in unit/address solution packet from above-mentioned domain name/address, extract the address that this domain name/address solves the address of sending method, device of packet and the transmission destination device that this domain name/address solves packet, wherein at least one side, and generation is by the address group that the address constituted of this extraction.
According to said structure, can generate, solve wherein at least one side's the address group that the address constituted of the address of the address of sending method, device of packet and the transmission destination device that this domain name/address solves packet by domain name/address.
Therefore, among the packet of this relay institute relaying, what become object that preferential transmission handles is: (1) solves packet from above-mentioned domain name/address and obtains the sending method, device that the obtained domain name in unit/address solves packet, sends the packet that solves the transmission destination device of packet to the above-mentioned domain name that obtains/address; (2) from the transmission destination device of the above-mentioned domain name that obtains/address solution packet, send the packet that solves the sending method, device of packet to the above-mentioned domain name that obtains/address.
Thus, when solving, domain name/address contains the address that solves the transmission destination device of packet and sending method, device as this domain name/address in the packet, MAC Address, and from solving packet and solved the data sending device of address by this domain name/address, when transmission can solve wherein at least one side's the device of the transmission destination device of packet and sending method, device via this domain name/address to the packet of above-mentioned data sink, just can be with this packet as the preferential object that transmits processing.
In addition, in relay of the present invention, above-mentioned domain name/address solves packet and obtains the unit and can just obtain at above-mentioned domain name/address solution packet of relaying this relay institute.
According to said structure, from this relay just among the packet groups of relaying, obtain domain name/address and solve packet.
Thus, need not to obtain domain name/address and solve packet, but can in this relay, obtain from external device (ED).
Therefore, need not to append in order to handle the function that domain name/address solves packet to the external device (ED) that receives domain name/address solution packet, solve packet but can obtain domain name/address by relay self, thereby can solve packet according to this domain name that obtains/address, generate the address group that constitutes with the address that comprises in the packet that will preferentially transmit.
In addition, in relay of the present invention, above-mentioned QoS object storage portion can also be the domain name in the affiliated territory of the above-mentioned data sending device that sends above-mentioned QoS object data bag, and to be set transmission priority to above-mentioned QoS object data bag, storage accordingly mutually, obtain domain name/address of obtaining the unit and solve the domain name of storing in domain name contained in the packet and the above-mentioned QoS object storage portion when consistent when above-mentioned domain name/address solves packet, above-mentioned prior information generation unit can be stored in the above-mentioned QoS object storage portion with the corresponding above-mentioned transmission priority of this domain name, and by the address group that one or more addresses constituted that comprises in this domain name/address solution packet, deposit accordingly mutually to above-mentioned packet prior information storage part, the preferential delivery unit of above-mentioned packet is to the packet of the object that becomes above-mentioned preferential transmission processing, and setting is stored in the above-mentioned packet prior information storage part, with by the corresponding above-mentioned transmission priority of the address group that the address constituted that comprises in this packet.
In said structure, the domain name and will being set to the transmission priority of the above-mentioned QoS object data bag mode with mutual correspondence in affiliated territory that sends the data sending device of QoS object data bag is stored.In addition, when the domain name of storing in domain name/address solves the domain name that comprises in the packet and QoS object storage portion was consistent, that stores in the QoS object storage portion was stored to above-mentioned packet prior information storage part in mutual corresponding mode with the corresponding transmission priority of this domain name and by the address group that one or more addresses constituted that comprises in this domain name/address solution packet.In addition, for the packet that becomes the object that preferential transmission handles, set with by the corresponding transmission priority of the address group that the address constituted that comprises in this packet.
Thus, preferentially transmitting when handling, the priority in the time of can becoming transmission priority level initializing the transmission of packet by each domain name institute corresponding stored, thus can come transfer data packets according to the priority of this setting.
Therefore, by changing the transmission priority with the domain name corresponding stored by each domain name, can set the corresponding transmission priority of domain name with the affiliated territory of this data sending device to the packet that sends from data sending device.In addition, be set to packet owing to transmit priority, therefore, the device destination, that be connected in communication network of the packet that sends out as this relay also can come transfer data packets according to setting the transmission priority of giving this packet.
In addition, in relay of the present invention, can also possess packet maintenance/issue unit, this packet maintenance/issue unit temporarily keeps the packet of this relay institute relaying, and among the packet of this maintenance, than the packet of the object that does not become above-mentioned preferential transmission processing, the packet that preferentially will become the object of above-mentioned preferential transmission processing is issued to the outside.
In said structure, than the packet of the object that does not become preferential transmission processing, the packet that preferentially will become the object of above-mentioned preferential transmission processing is issued to the outside.
Therefore, when this relay sends packet,, can preferentially send the packet of the object that becomes preferential transmission processing than the packet of the object that does not become preferential transmission processing.
In addition, in relay of the present invention, above-mentioned QoS object storage portion can also be the domain name in the affiliated territory of the above-mentioned data sending device that sends above-mentioned QoS object data bag, and to be set transmission priority to above-mentioned QoS object data bag, storage accordingly mutually, obtain domain name/address of obtaining the unit and solve the domain name of storing in domain name contained in the packet and the above-mentioned QoS object storage portion when consistent when above-mentioned domain name/address solves packet, above-mentioned prior information generation unit can be stored in the above-mentioned QoS object storage portion with the corresponding above-mentioned transmission priority of this domain name, and by the address group that one or more addresses constituted that comprises in this domain name/address solution packet, deposit accordingly mutually to above-mentioned packet prior information storage part, the preferential delivery unit of above-mentioned packet can be to the packet of the object that becomes above-mentioned preferential transmission processing, setting is stored in the above-mentioned packet prior information storage part, with by the corresponding above-mentioned transmission priority of the address group that the address constituted that comprises in this packet, can also possess packet maintenance/issue unit, this packet maintenance/issue unit temporarily keeps the packet of this relay institute relaying, among the packet of this maintenance, than the packet of the object that does not become above-mentioned preferential transmission processing, the packet that preferentially will become the object of above-mentioned preferential transmission processing is issued to the outside.
In said structure, the domain name and will being set to the transmission priority of QoS object data bag in affiliated territory that sends the data sending device of QoS object data bag is stored by the mode with mutual correspondence.In addition, when the domain name of storing in domain name/address solves the domain name that comprises in the packet and QoS object storage portion was consistent, that stores in the QoS object storage portion was deposited to above-mentioned packet prior information storage part in mutual corresponding mode with the corresponding transmission priority of this domain name and by the address group that one or more addresses constituted that comprises in this domain name/address solution packet.In addition, to become the packet of the object that preferential transmission handles, set be stored in the packet prior information storage part, with by the corresponding transmission priority of the address group that the address constituted that comprises in this packet.Than the packet of the object that does not become preferential transmission processing,, this packet preferentially is issued to the outside according to setting packet, the above-mentioned transmission priority of giving the object that becomes above-mentioned preferential transmission processing.
Therefore, when this relay sends packet,, can preferentially send the packet of the object that becomes preferential transmission processing than the packet of the object that does not become preferential transmission processing.Simultaneously, can be set to packet, therefore,, come transfer data packets as the transmission priority that the device destination, that be connected in communication network of the packet that this relay sent out also can be given this packet according to setting owing to transmit priority.
In addition, in relay of the present invention, can also possess QoS object setup unit, the information that this QoS object setup unit reads out from above-mentioned QoS object storage portion to user prompt, and accept input from the user, and, above-mentioned QoS object storage portion is upgraded according to the input of being accepted.
In said structure, the information that from QoS object storage portion, reads out to user prompt.In addition, according to the input of being accepted from the user, portion upgrades to the QoS object storage.
Thus, user's canned data in the QoS object storage portion of can reading can also upgrade canned data in the QoS object storage portion simultaneously.That is, can set and upgrade the domain name of storing in the QoS object storage portion.
Therefore, want the data flow that preferentially receives by receiving system for the user, the user can store the domain name of the data sending device that sends this data flow in the QoS object storage portion into, therefore can realize the QoS that respective user is set.
In addition, in relay of the present invention, above-mentioned QoS object storage portion can also be the domain name in the affiliated territory of the above-mentioned data sending device that sends above-mentioned QoS object data bag and the title of the service that this data sending device provided, storage accordingly mutually.
According to said structure, the title of above-mentioned domain name and above-mentioned service is stored in the mode of mutual correspondence.
Thus, the domain name that the user not only can read and store in the QoS object storage portion, the title of the service that device provided that has this domain name of can also reading.
Therefore, the user can be on one side with reference to the title of service, and one side is upgraded QoS object storage portion, thereby can improve user convenience.
In addition, in relay of the present invention, above-mentioned QoS object storage portion can also the domain name in the affiliated territory of the above-mentioned data sending device that sends above-mentioned QoS object data bag and in order to expression whether with the information of this QoS object data bag as the QoS object, storage accordingly mutually.
At this, may not be this two value of " as object " and " not as object " as the information of QoS object whether with above-mentioned QoS object data bag in order to expression.For example also can be considered as positive integer value " 0 " to be considered as in order to represent the value of " not as object " in order to represent the value of " as object ".
According to said structure, above-mentioned domain name and the information that whether becomes above-mentioned QoS object in order to expression are stored to QoS object storage portion by the mode with mutual correspondence.
Thus, about by domain name specific territory, for the QoS object data bag that data sending device sent that is subordinated to this territory, whether the user can set with the object of this packet as QoS.
Therefore, behaviour in service that can respective user is set the packet of the object that becomes QoS, thereby can be improved user convenience.
Above-mentioned communication control unit and relay also can be realized by computer, when this situation, make computer as above-mentioned each unit generation function, with this make computer realize above-mentioned communication control unit and relay, control program and the computer-readable recording medium that records this control program be also contained in the category of the present invention.
Above-mentioned embodiment that occurs in the detailed description of the present invention or embodiment only are the examples that discloses technology contents of the present invention, the present invention is not limited to above-mentioned concrete example, should not carry out the explanation of narrow sense to the present invention, above-mentioned embodiment or embodiment can carry out various changes in the scope of spirit of the present invention and claim implements.
(industrial utilize possibility)
The present invention can be applicable to preferably according to the communication data packet in the communication network the priority of being paid come the transmission of this communication data packet is controlled, communication control unit and communication relay device. Especially can be used in preferably in HGW and the PLC adapter.

Claims (17)

1. a relay carries out relaying to the packet of receiving and dispatching between data sending device and data sink,
This relay is characterised in that to possess:
QoS object storage portion stores above-mentioned data sending device that the QoS object data bag that becomes the QoS object is sent, the domain name in affiliated territory at least;
Domain name/address solves packet and obtains the unit, domain name/address of obtaining in order to the address that solves above-mentioned data sending device solves packet, wherein, above-mentioned domain name/address solves sending method, device, domain name/address that the domain name in the affiliated territory that comprises this data sending device in the packet and this data sending device, domain name/address solve packet and solves the transmission destination device of packet, above-mentioned data sink, wherein at least one side's address;
The prior information generation unit, obtain domain name/address of obtaining the unit and solve the domain name of storing in domain name contained in the packet and the above-mentioned QoS object storage portion when consistent when above-mentioned domain name/address solves packet, extract above-mentioned domain name/address solution packet and obtain one or more contained addresses in domain name/address solution packet of obtaining the unit, and generate the address group that the address constituted by this extraction, and the address group that will generate is deposited to packet prior information storage part;
The preferential delivery unit of packet, when when consistent, preferentially transmit above-mentioned preferential transmission and handle by the packet of relaying by certain address faciation of storing in the above-mentioned address group that one or more addresses constituted that comprises in by the packet of relaying and the above-mentioned packet prior information storage part.
2. relay according to claim 1 is characterized in that:
When above-mentioned domain name/address solve packet obtain the unit obtained a plurality of above-mentioned domain name of the 1st scheduled period/address solve packet separately in certain domain name of storing in the domain name that comprises and above-mentioned QoS object storage portion when consistent, above-mentioned prior information generation unit be extracted in the above-mentioned domain name that above-mentioned the 1st scheduled period obtained/address solve packet certain or a plurality of in one or more addresses of comprising, and generate the address group that the address constituted by this extraction.
3. relay according to claim 1 and 2 is characterized in that:
Also possess prior information and eliminate the unit,
About this relay one or more packets at the 2nd scheduled period relaying, to with any packet in the address group that one or more addresses constituted that comprises all inconsistent, be stored in the above-mentioned address group in the above-mentioned packet prior information storage part, above-mentioned prior information is eliminated the unit and is eliminated.
4. according to any described relay in the claim 1～3, it is characterized in that:
Above-mentioned domain name/address solves packet, is sent out the packet to above-mentioned data sink as the answer that the inquiry of the address of above-mentioned data sending device has been done.
5. according to any described relay in the claim 1～3, it is characterized in that:
Above-mentioned domain name/address solves packet, the packet that sends out as the inquiry of the address of above-mentioned data sending device and from above-mentioned data sink.
6. relay according to claim 4 is characterized in that:
Above-mentioned prior information generation unit solves packet and obtains the obtained domain name in unit/address solution packet from above-mentioned domain name/address, the address of the transmission destination device of the address of the above-mentioned data sending device that extraction has been solved and this domain name/address solution packet, wherein at least one side, and generation is by the address group that the address constituted of this extraction.
7. according to claim 4 or 5 described relays, it is characterized in that:
Above-mentioned prior information generation unit solves packet and obtains the obtained domain name in unit/address solution packet from above-mentioned domain name/address, extract the address that this domain name/address solves the address of sending method, device of packet and the transmission destination device that this domain name/address solves packet, wherein at least one side, and generation is by the address group that the address constituted of this extraction.
8. according to any described relay in the claim 1～7, it is characterized in that:
Above-mentioned domain name/address solves packet and obtains the unit this relay institute is just obtained at above-mentioned domain name/address solution packet of relaying.
9. according to any described relay in the claim 1～8, it is characterized in that:
Above-mentioned QoS object storage portion is also the domain name in the affiliated territory of the above-mentioned data sending device that sends above-mentioned QoS object data bag and will be set transmission priority to above-mentioned QoS object data bag, storage accordingly mutually,
Obtain domain name/address of obtaining the unit and solve the domain name of storing in domain name contained in the packet and the above-mentioned QoS object storage portion when consistent when above-mentioned domain name/address solves packet, above-mentioned prior information generation unit solves the address group that one or more addresses constituted that comprises in the packet being stored in the above-mentioned QoS object storage portion with the corresponding above-mentioned transmission priority of this domain name and by this domain name/address, deposit accordingly mutually to above-mentioned packet prior information storage part
The preferential delivery unit of above-mentioned packet is to the packet that becomes the object that above-mentioned preferential transmission handles, set be stored in the above-mentioned packet prior information storage part, with by the corresponding above-mentioned transmission priority of the address group that the address constituted that comprises in this packet.
10. according to any described relay in the claim 1～9, it is characterized in that:
Also possess packet maintenance/issue unit,
This packet maintenance/issue unit temporarily keeps the packet of this relay institute relaying, and among the packet of this maintenance, than the packet of the object that does not become above-mentioned preferential transmission processing, the packet that preferentially will become the object of above-mentioned preferential transmission processing is issued to the outside.
11., it is characterized in that according to any described relay in the claim 1～8:
Above-mentioned QoS object storage portion is also the domain name in the affiliated territory of the above-mentioned data sending device that sends above-mentioned QoS object data bag and will be set transmission priority to above-mentioned QoS object data bag, storage accordingly mutually,
Obtain domain name/address of obtaining the unit and solve the domain name of storing in domain name contained in the packet and the above-mentioned QoS object storage portion when consistent when above-mentioned domain name/address solves packet, above-mentioned prior information generation unit will be stored in and solve the address group that one or more addresses constituted that comprises in the packet with the corresponding above-mentioned transmission priority of this domain name and by this domain name/address in the above-mentioned QoS object storage portion, deposit accordingly mutually to above-mentioned packet prior information storage part
The preferential delivery unit of above-mentioned packet is to the packet of the object that becomes above-mentioned preferential transmission processing, setting be stored in the above-mentioned packet prior information storage part, with by the corresponding above-mentioned transmission priority of the address group that the address constituted that comprises in this packet
Also possesses packet maintenance/issue unit, this packet maintenance/issue unit temporarily keeps the packet of this relay institute relaying, among the packet of this maintenance, than the packet of the object that does not become above-mentioned preferential transmission processing, the packet that preferentially will become the object of above-mentioned preferential transmission processing is issued to the outside.
12., it is characterized in that according to any described relay in the claim 1～11:
Also possess QoS object setup unit, the information that this QoS object setup unit reads out from above-mentioned QoS object storage portion to user prompt, and accept input from the user, and according to the input of being accepted is upgraded above-mentioned QoS object storage portion.
13. relay according to claim 12 is characterized in that:
Above-mentioned QoS object storage portion is also the domain name in the affiliated territory of the above-mentioned data sending device that sends above-mentioned QoS object data bag and the title of the service that this data sending device provided, storage accordingly mutually.
14., it is characterized in that according to claim 12 or 13 described relays:
Above-mentioned QoS object storage portion also the domain name in the affiliated territory of the above-mentioned data sending device that sends above-mentioned QoS object data bag and in order to expression whether with the information of this QoS object data bag as the QoS object, storage accordingly mutually.
15. a communication control unit is controlled the transmission that is sent to the communication data packet that comprises in the data flow of data sink by data sending device, wherein,
Above-mentioned data sending device is subordinated to the territory,
Above-mentioned data flow is made up of a plurality of above-mentioned communication data packet,
Above-mentioned data sink is in the 1st requirement that has sent in order to the mailing address of above-mentioned data sending device is asked, and after having obtained mailing address as the above-mentioned data sending device of the 1st answer that requires, send in order to ask the 2nd requirement of above-mentioned data flow to above-mentioned data sending device according to this mailing address
As the 2nd answer that requires, above-mentioned data sending device sends above-mentioned data flow to above-mentioned data sink,
This communication control unit is characterised in that:
The above-mentioned the 1st includes the domain name in affiliated territory of above-mentioned data sending device and the mailing address of above-mentioned data sink in requiring,
Possess,
Domain name/address extraction unit is extracted the domain name of above-mentioned data sending device and the mailing address of above-mentioned data sink from the above-mentioned the 1st requires;
The unit is obtained in the address, and the domain name that obtains the above-mentioned data sending device that extracts with above-mentioned domain name/address extraction unit is corresponding, the mailing address of above-mentioned data sending device;
The 1st storage part is with the domain name of above-mentioned data sending device and will be set transmission priority to above-mentioned communication data packet, storage accordingly mutually;
Territory priority obtains the unit, from above-mentioned the 1st storage part, obtains the corresponding transmission priority of domain name of the above-mentioned data sending device that extracts with above-mentioned domain name/address extraction unit;
The priority data generation unit, group and above-mentioned territory priority that the mailing address of the above-mentioned data sink that is extracted by above-mentioned domain name/address extraction unit and mailing address that the above-mentioned data sending device of obtaining the unit is obtained in above-mentioned address are formed obtain the obtained transmission priority in unit, deposit accordingly to the 2nd storage part mutually
Form in each communication data packet of above-mentioned data flow and include, become the mailing address of above-mentioned data sending device of the transmit leg of this communication data packet; Become the mailing address of above-mentioned data sink of the transmission destination of this communication data packet; The transmission priority of this communication data packet,
Also possess,
Sender address/transmission destination-address extraction unit from the above-mentioned communication data packet of forming above-mentioned data flow, is extracted the mailing address of above-mentioned transmit leg and the mailing address of above-mentioned transmission destination;
Packet priority obtains the unit, group about the mailing address of the mailing address of the above-mentioned transmit leg that extracted by above-mentioned sender address/transmission destination-address extraction unit and above-mentioned transmission destination is formed obtains from above-mentioned the 2nd storage part with this and organizes corresponding transmission priority;
Above-mentioned packet priority is obtained the above-mentioned priority that obtains the unit as the priority of above-mentioned communication data packet and set to this communication data packet in packet priority level initializing unit.
16. a communication control unit is controlled the transmission that is sent to the communication data packet that comprises in the data flow of data sink by data sending device, and this communication data packet is carried out relaying, wherein,
Above-mentioned data sending device is subordinated to the territory,
Above-mentioned data flow is made up of a plurality of above-mentioned communication data packet,
Above-mentioned data sink is in the 1st requirement that has sent in order to the mailing address of above-mentioned data sending device is asked, and after having obtained mailing address as the above-mentioned data sending device of the 1st answer that requires, send in order to ask the 2nd requirement of above-mentioned data flow to above-mentioned data sending device according to this mailing address
As the 2nd answer that requires, above-mentioned data sending device sends above-mentioned data flow to above-mentioned data sink,
This communication control unit is characterised in that:
Include the mailing address of the domain name in the affiliated territory of above-mentioned data sending device, above-mentioned data sending device, the mailing address of above-mentioned data sink in the above-mentioned the 1st answer that requires,
Possess,
Domain name/address extraction unit is extracted the domain name of above-mentioned data sending device, the mailing address of above-mentioned data sending device, the mailing address of above-mentioned data sink from the above-mentioned the 1st answer that requires of this communication control unit institute relaying;
The 1st storage part is with the domain name of above-mentioned data sending device and will be set transmission priority to above-mentioned communication data packet, storage accordingly mutually;
Territory priority obtains the unit, from above-mentioned the 1st storage part, obtains the corresponding transmission priority of domain name of the above-mentioned data sending device that extracts with above-mentioned domain name/address extraction unit;
The priority data generation unit, group and above-mentioned territory priority that the mailing address of the mailing address of the above-mentioned data sending device that is extracted by above-mentioned domain name/address extraction unit and above-mentioned data sink is formed obtain the obtained transmission priority in unit, deposit accordingly to the 2nd storage part mutually
Form in each communication data packet of above-mentioned data flow and include, become the mailing address of above-mentioned data sending device of transmit leg of this communication data packet and the mailing address of above-mentioned data sink that becomes the transmission destination of this communication data packet,
Also possess,
Sender address/transmission destination-address extraction unit from the above-mentioned communication data packet of forming above-mentioned data flow, is extracted the mailing address of above-mentioned transmit leg and the mailing address of above-mentioned transmission destination;
Packet priority obtains the unit, group about the mailing address of the mailing address of the above-mentioned transmit leg that extracted by above-mentioned sender address/transmission destination-address extraction unit and above-mentioned transmission destination is formed obtains from above-mentioned the 2nd storage part with this and organizes corresponding transmission priority;
The packet transmit control unit is obtained the obtained above-mentioned transmission priority in unit according to above-mentioned packet priority, and the transmission of the above-mentioned communication data packet of forming above-mentioned data flow is controlled.
17. a relay carries out relaying to packet,
It is characterized in that possessing:
QoS object storage portion, storage becomes the 1st domain name and the 2nd domain name of QoS object at least;
Domain name/address solves data packet detecting unit unit, detecting above-mentioned packet by relaying is that the 1st domain name/address is when solving packet, judge that domain name that this detected the 1st domain name/address solves the inquiry object that comprises in the packet is whether consistent with the 1st domain name of storing in the above-mentioned QoS object storage portion, simultaneously, detecting above-mentioned packet by relaying is the 2nd domain name/address when solving packet, judges that domain name that this detected the 2nd domain name/address solves the inquiry object that comprises in the packet is whether consistent with the 2nd domain name of storing in the above-mentioned QoS object storage portion;
Priority data generates processing unit, when the result of above-mentioned judgement is, the 1st domain name of storing in the domain name that above-mentioned the 1st domain name/address solves the inquiry object that comprises in the packet and the above-mentioned QoS object storage portion is consistent, and when the 2nd domain name of storing in the domain name that above-mentioned the 2nd domain name/address solves the inquiry object that comprises in the packet and the above-mentioned QoS object storage portion is consistent, from above-mentioned the 1st domain name/address solution packet and above-mentioned the 2nd domain name/address solution packet, extract the address, and generate the priority data of the address comprise this extraction, and the priority data that will generate is deposited to packet priority storage part;
Packet preferentially transmits processing unit, when the address that comprises in the above-mentioned priority data of the above-mentioned address that comprises in by the packet of relaying and above-mentioned packet priority storage portion stores is consistent, preferentially above-mentioned packet is carried out relaying.
CN2009801139837A 2008-04-24 2009-04-23 Relay device and communication control device Pending CN102017545A (en)

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CN106973123A (en) * 2017-02-03 2017-07-21 广东欧珀移动通信有限公司 A kind of equipment online processing method and processing device

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