CN1947389A - Method in a communication system, a communication system and a communication device - Google Patents
Method in a communication system, a communication system and a communication device Download PDFInfo
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- CN1947389A CN1947389A CNA2005800129079A CN200580012907A CN1947389A CN 1947389 A CN1947389 A CN 1947389A CN A2005800129079 A CNA2005800129079 A CN A2005800129079A CN 200580012907 A CN200580012907 A CN 200580012907A CN 1947389 A CN1947389 A CN 1947389A
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Abstract
Media streams are transmitted from a sending communication device (MT1) to a receiving communication device (NW2) at least partly via a wireless communication network. At least one media stream is selected to be transmitted to the receiving communication device, QoS requirements for transmitting the selected at least one media stream are defined, transmission resources are reserved from the wireless communication network for the transmission of the at least one media stream, and a setup procedure is performed between the receiving communication device and the sending communication device for activating the one packet data transmission connection.
Description
Technical field
Technical field is the field of the defeated medium body of stream on the mobile network, and wherein multimedia server, mobile network and flow transmission client computer logically are connected with the Real-time Transport Protocol (real time transport protocol) that for example is used for the medium transmission via the RTSP agreement (real time streaming transport protocol) that for example is used for session set-up and control.The flow transmission system can be rate adaptation rate adaptation or non-.The flow transmission system of the rate adaptation that the present invention relates to make content and/or transmission rate be adapted to the variable network channel condition.
The present invention relates to the method in a kind of communication system, wherein media stream is transferred to received communication equipment via wireless communication system from sending communication equipment at least in part.The present invention also relates to a kind of communication system, this communication system comprise send communication equipment, received communication equipment and in order at least in part via cordless communication network with media stream from sending the communication network that communication equipment is transferred to received communication equipment.The invention still further relates to a kind of transmission communication equipment and a kind of received communication equipment.
Background technology
In this manual, term transmission communication equipment is meant and comprises the communication equipment that is used for media stream is sent to the reflector of communication network.Term received communication equipment is meant and comprises the communication equipment that receives the receiver of media stream respectively from communication network.Clearly, same communication equipment can comprise reflector and receiver the two, allow unidirectional or two-way communication thus with communication network.Wireless Telecom Equipment is included in reflector and/or the receiver of implementing radio communication in the cordless communication network.The term cordless communication network, such as mobile communications network, generally be meant between the standing part of Wireless Telecom Equipment and system to make wireless data transmission be connected to become possibility any communication system that the user of Wireless Telecom Equipment moves within the working range of system.Typical wireless communication system is public-land mobile network (PLMN).Known example is gsm system (a global mobile communication system).The present invention preferably relates to 3-G (Generation Three mobile communication system).As an example, Universal Mobile Telecommunications System (UMTS) is used as the example of this third generation communication system.
In third generation system, term carrier service and service have been used.The carrying service provides the telecommunications service type in order to the facility of transmission signals between access point.In general, the carrying service is corresponding to the term Traffic Channel, and this term has for example defined message transmission rate and the service quality (QoS) that will use in system when information is transmitted between another part of Wireless Telecom Equipment and system.Carrying service between Wireless Telecom Equipment and base station for example is a radio bearer service, and the service of the carrying between wireless network control unit and core network for example is 1u carrying service (interface UMTS carrying).In the UMTS system, the interface between wireless network control unit and core network is called the lu interface.In UMTS, so-called GERAN part is also arranged, this part is also used the interface that is called Gb Interface except that using the lu interface.In this connection, service is to be used to carry out (or a plurality of) task by what mobile communications network provided; For example, data, services is carried out transfer of data in communication system, and telephone service relates to call, multimedia etc.Therefore, the transfer of data of this service request between the standing part of Wireless Telecom Equipment and system is such as call or transmission of multimedia streams.A vital task of 3-G (Generation Three mobile communication system) work is can distribute to travelling carriage and do not waste the such mode of available bandwidth and control (initialization as required,, keep and stop) carrying service with each requested service.
The for example definite how during the transmission processing protocol data cell (PDU) in mobile communications network of the quality of service.For example, the QoS rank that defines for link address is used to control transmission order, buffering (packet chain) and refusal grouping in support node and gateway support node, particularly two or more when being connected with grouping and will transmitting simultaneously.Different QoS ranks has for example determined that the difference for the transmitted in packets between the difference end that connects postpones and different bit rates.Equally, refuse and/or the number of the Packet Data Unit lost can change with different QoS ranks with interrelating.
Can be at the different QoS of each PDP Context request.For example, in Email connects, can in the transmission of stream, allow long relatively delay.Yet, such as the transmitted in packets of the such real-time, interactive application requirements two-forty of video consultation.Transmitting such as file during such some use, importantly packet-switched transmission does not have mistake, wherein transmitting grouped data unit again then if necessary under the situation of makeing mistakes.
For for the packet switching communication service in the UMTS system, proposed definition, and for the character of these classs of service, purpose is to consider different criterions for different connection types to four kinds of different business classifications.Be that the criterion that first and second classifications define is to transmit in real time, wherein should transmission must significantly do not postpone.Yet in such classification, the accuracy that data transmit not is an important properties like this.In a corresponding way, the non-real-time data transmission is enough for third and fourth class of service, but requires them that relatively accurate transfer of data is arranged.The example of real-time first kind communication is a transmission dialogic voice signal under the situation that two or more people discuss mutually by means of Wireless Telecom Equipment.The second real-time class communication example of the practicable situation of possibility therein is that transmission video signal is used for watching immediately (flow transmission).For example for such as scanning for the such use database service of the Internet home page, can use the 3rd class non real-time packet communication, wherein comparing with real-time Data Transmission with the relatively accurate transfer of data of reasonable rate is even more important factor.In the system routine according to this, for example the transmission of email message and file can classify as the 4th category.Naturally, the number of class of service needs not to be four as mentioned here, and the present invention can use in the packet-switched communication system of the class of service that comprises any number.The character of the class of service of four propositions has concisely in table 1 and presents.
| Classification | The first kind (conversational class): in real time, for example capacity of telephone conversation-assurance-not affirmation | Second class (flow transmission class) is real-time, for example the buffering of the capacity of video information-assurance-may confirm-application level | The 3rd class (interactive class) :-method-affirmation of doing one's best alternately;-explorer, Telnet-real-time control channel | The do one's best background of background transmission-affirmation-email message, calendar event etc. of method of the 4th class (background classes) loads |
| Maximum bit rate (kbps) | ＜2048 | ＜2048 | ＜2048-expense | ＜2048-expense |
| Send order | Be/not | Be/not | Be/not | Be/not |
| Largest packet size (byte) (SDU) | ≤ 1500 or 1502 | ≤ 1500 or 1502 | ≤ 1500 or 1502 | ≤ 1500 or 1502 |
| The transmission of erroneous packet (SDU) | Be/not- | Be/not- | Be/not- | Be/not- |
| Residual bit error rate | 5*10 -2，10 -2，5*10 -3， 10 -3，10 -4，10 -5，10 -6 | 5*10 -2，10 -2，5*10 -3， 10 -3，10 -4，10 -5，10 -6 | 4*10 -3，10 -5，6*10 -8 | 4*10 -3，10 -5，6*10 -8 |
| Packet error probability (SDU) | 10 -2，7*10 -3，10 -3， 10 -4，10 -5 | 10 -1，10 -2，7*10 -3， 10 -3，10 -4，10 -5 | 10 -3，10 -4，10 -6 | 10 -3，10 -4，10 -6 |
| Transmission delay (ms) | The 100ms-maximum | The 200ms-maximum | ||
| The bit rate (kbps) that guarantees | ＜2048 | ＜2048 | ||
| Business Processing priority | 1，2，3 | |||
| Distribute priority | 1，2，3 | 1，2，3 | 1，2，3 | 1，2，3 |
Table 1
Guarantee that bit rate is used for admitting control and resource to keep at RAN and CN place, maximum bit rate is used for control at the CN place, and promptly the bit rate that does not allow to be higher than maximum bit rate at GGSN enters CN, and the grouping that surpasses this bit rate will be dropped.
The modern second generation is compared with more outmoded Wireless Telecom Equipment with third generation Wireless Telecom Equipment has much better data processing character.For example, they have had to be connected to the internet and to use and have scanned application fetching the facility of information from the internet in the Wireless Telecom Equipment, and in the future might be for example set up multimedia call for real-time video meeting etc.
The requirement of different application may be far from each other.High-speed traffic between some application requirements reflectors and the receiver.These application examples are as comprising video and phone application.Some other application may require accurate data transmission as far as possible, but the bit rate that transfer of data connects is just so unimportant.These application examples are as comprising Email and database application.On the other hand, these application can be used in having several Wireless Telecom Equipments of different nature.
The user of Wireless Telecom Equipment may wish to watch multimedia presentation with Wireless Telecom Equipment.The user finds the load address of this demonstration, and will send to Wireless Telecom Equipment to the request that sends demonstration.This request is processed in communication system.The load address of the multimedia presentation of being asked can be addressed to the server in the communication network, such as the server of internet.Multimedia presentation is delivered to the server that receives Wireless Telecom Equipment is referred to as streaming server in this manual.
Communication system should be communicating by letter between streaming server and the Wireless Telecom Equipment and keeps enough resources so that the multimedia presentation that transmissibility is asked.Otherwise just may be in receiving Wireless Telecom Equipment with identical accuracy and present this demonstration error-free.At first in the UMTS communication system, wireless communication device requests has the PDP Context of some qos parameter.Then, network selects the basis to select carrying for this connection by using some, and this selection basis for example is a Wireless Telecom Equipment used parameter in this request.Such selection basis may be incorrect or inadequately accurate, wherein following situation may occur: the carrying service can't provide more than required capacity for this connection provides enough transmission capacity or it, and wherein the use of Internet resources is not effective.
Another situation that wherein may need to send multimedia messages is that two Wireless Telecom Equipments intercom mutually so that exchange such as video or the such a multimedia messages of static map.Equally in this case, should keep enough resources for this communication by network.Yet, when using the method for prior art, always can be to the demand of the two ends of this connection notice for this connection.
Basic flow transmission system right and wrong are adaptive.For example, the current group exchange current transmission service (PSS) that is defined in the 4th and the 5th distribution by 3GPP is exactly a non-self-adapting.Packet switching flow transmission service in the 6th distribution will be adaptive.Self-adaptive features is to be that the two following ability of streaming server and client computer is come given by system, the network channel condition of this ability in order to be adapted to change, such as the variation in QoS negotiated channel bit rate, propagation delay, other QoS parameter, perhaps under situation about transferring or even the variation in the bottom-layer network.
In order to make system self-adaption, some that must set up between streaming server and the client computer communicated by letter.This point all is suitable when the RTSP agreement is used for that session set-up still is a session control.Yet the transmission necessary information must be carried out in correct mode between server and client computer, so that the system that guarantees is adaptive and finally can realizes being used for the optimal user quality of server of Voice ﹠ Video flow transmission.
For this reason, some prior aries realized will be from bottom mobile network's QoS information from the flow transmission client transmission to streaming server.This just allows more cooperations between the two ends so that system's self adaptation more.
Still unspecified up to now is qos parameter in concrete mobile network environment and the relation between PDP (packet data protocol) the context purposes.For example, different situations are possible.Hereinafter, do not consider the related RTCP stream relevant with each RTP Media Stream.Alternatively, a part that RTP and related RTCP stream thereof is considered to same media stream does not change the name of the game:
1.PDP context carries only medium of flow transmission session.
2.PDP context carries all medium of flow transmission session under situation about having more than medium.
If the decision of flow transmission client computer for example sends some QoS profile parameters with signal to streaming server via RTSP, the for example bit rate of Bao Zhenging, maximum bit rate or propagation delay, then server may be in the correct deciphering of QoS profile and is finally occurred some problems in essence what network connected.
Two kinds of possible sessions are arranged, controlled session of promptly so-called gathering and the controlled session of non-gathering in RTSP.Assembling controlled session is such session, is wherein transmitting rank, and (for example be used for a Voice ﹠ Video form the RTSP PLAY order of the two) formed and can be controlled by the individual command that is sent to server by client computer to all medium.If such situation do not occur, promptly in session, control at least one medium individually and form, then this session just is called and has non-gathering control.
Hereinafter, some examples have been disclosed so that illustrate the problem relevant with the qos parameter of consulting media stream.Should be noted that example and the different parameters that uses are nonrestrictive in example, and in the enforcement of reality, may have the combination of different types of parameter and Media Stream.
Example 1
In this example, media stream comprises two medium (for example video flowing of an audio stream).All different medium are to use single PDP Context to transmit.
Suppose that the flow transmission client computer receives (for example via the SDP agreement) as sending a notice from streaming server: audio stream requires 12kbps, and video bit stream requires 52kbps.Suppose that also the flow transmission client computer uses single PDP Context to set up and being connected of mobile network, wherein client computer wish by this connection transmission of audio stream and video flowing the two, suppose that also network permitted the PDP Context with following (except that other parameter especially) QoS profile parameter:
Bit rate=the 64kbps that guarantees
Maximum bit rate=70kbps
Now hypothesis flow transmission client computer is wished to the streaming server notice about coming the granting qos of automatic network, so that system's self adaptation more.In order to raise the efficiency, suppose that the client computer decision sent this information with signal before two medium of beginning playback.Therefore, it selects to use the SETUP method to send above-mentioned two fields with signal.Since two medium are arranged, so client computer is embedded into transmission two fields of two the SETUP message (is used for one of audio frequency and is used for video) with following information:
SETUP (audio frequency):
Bit rate=the 12kbps that guarantees
Maximum bit rate=70kbps
SETUP (video):
Bit rate=the 52kbps that guarantees
Maximum bit rate=70kbps
The bit rate of the assurance that sends with signal in each SETUP comprises the required bandwidth of each medium (the two is known for streaming server and flow transmission client computer for this), but maximum bit rate information can only be the maximum bit rate of the permission in the PDP Context.Therefore, it can only be 70kbps in this example, because can't split maximum bit rate between two medium.The SETUP method is read as the description of each medium by streaming server.Therefore, server can be read as, two network channels are arranged virtually, these two channels have the feature described by two SETUP message (channel has the bit rate of assurance of 12kbps and the maximum bit rate of 70kbps, and another channel has the bit rate of assurance of 52kbps and the maximum bit rate of 70kbps).The bit rate that the accumulation of medium guarantees is 12+52=64kbps, and this is the bit rate of the real network assurance of PDP Context.Server has the right to send the maximum bit rate of 70kbps and send the maximum bit rate of 70kbps at video at audio frequency.When using single PDP Context, this means that the accumulation maximum bit rate of medium is 70+70=140kbps, this is not the network maximum bit rate for PDP Context.Because each Media Stream can transmit with variable bit rate, so the instantaneous bit rate sum of two medium can reach 140kbps at any one time.Yet, be not allowed to greater than each value of the maximum bit rate that provides by network (in this example, being 70kbps), because Internet resources are unavailable.Therefore, cause server error to understand the QoS information of PDP Context.This has just caused bad user QoS.
On the other hand, consider that splitting the 70kbps maximum bit rate in proportional mode between two medium then is to cause the idea of server for channel utilization the carrying out suboptimum utilization of being shared by different medium.Server can be attempted as there being two independent PDP Contexts to use channel.
If send to the bit rate information of the assurance of server and be in PDP Context by the information of the real permission of network then similar problem occurs.For example, if the information of the bit rate of the assurance of permission 64kbps sends to server in two SETUP message, then can produce even more problem, because server will be had the right even send with the bit rate of the assurance of audio frequency 64kbps and video 64kbps, cause the bit rate of total assurance of 128kbps, this is disabled in this routine PDP QoS.This will produce network buffer and overflow and bad user QoS.
Example 2
In this other example, Media Stream also comprises two medium (for example video flowing of an audio stream), but each different medium is to use independent PDP Context to transmit.
Suppose that the flow transmission client computer receives as sending a notice from streaming server (for example via the SDP agreement): audio stream requires 12kbps, and video flowing requires 52kbps.Suppose that also the flow transmission client computer uses two independent PDP Contexts to set up and being connected of mobile network, wherein client computer wishes to connect respectively transmission of audio stream and video flowing by this, supposes that also network permitted the PDP Context with following (except that other parameter especially) QoS profile parameter:
The PDP Context that is used for audio frequency:
Bit rate=the 12kbps that guarantees
Maximum bit rate=20kbps
The PDP Context that is used for video:
Bit rate=the 52kbps that guarantees
Maximum bit rate=64kbps
Now hypothesis flow transmission client computer is wanted to the streaming server notice about coming the granting qos of automatic network, so that system's self adaptation more.QoS information can send in the PLAY order.The PLAY order generally is read as the gathering session command by server.Therefore, must send only a pair of parameter.Client computer can determine to send the bit rate=12+52=64kbps and the maximum bit rate=20+64=84kbps of assurance.This makes server be at a loss, and this server will be understood as the single PDP Context that uses the qos parameter with appointment, and not be such situation in this example.
Streaming server is responsible for sending streaming data, and Wireless Telecom Equipment cushioned the data of scheduled volume in advance before actual playback.Streaming server also is responsible for adjusting transmitted bit speed to compensate actual transmission bandwidth variation and to safeguard receiver buffer (wobble buffer).
In 3GPP, packet switching flow transmission (PSS) client computer can be to the feature of PSS server report cordless communication network.This information can be covered in real time streaming transport protocol (RTSP) header, wherein define parameter about network.Parameter can for example be the bit rate of the assurance of network, the maximum bit rate of network and the maximum propagation delay of network.
For the transmission of multimedia streams server, can be adapted to different condition of contacts and also be basic such as EGPRS (enhancement type general use grouping wireless service) and the such different network type of CDMA2000 (code division multiple access) 1 * EV-DV.Different mobile networks shows different, and for example the EGPRS transmission channel bandwidth changes little than CMDA20001 * EV-DV channel.If streaming server is known the network type that client computer is used, then its delivery service better.For example, if client computer just on the transmission channel of High variation, then streaming server should not made a response to channel variation too soon.On the other hand, operate, then any channel variation should be included in consideration and make a response quickly if streaming server is known to move on the stable channel.If network type is known, then streaming server can be adjusted Control Parameter at sending of streaming data.Regrettably, such information is available at client-side only.
At present, 3GPP has the different UNCs relevant with other signaling with rate adaptation with 3GPP2.If the transmission of multimedia streams server is not known client computer at the network that uses what type, then server may have problem about request being made response during signaling.Follow the server of 3GPP and 3GPP2 should can parsing the signaling relevant with corresponding standard with transmission, just carry out when still having only information to be available server.
Under above-mentioned example situation, subject matter is that streaming server do not know that what type for data transmit the network channel type that (it can be single or multiple PDP Contexts) keeps be, because it can't see PDP Context distribution type.This only just can see at the flow transmission client-side.
Summary of the invention
Therefore the objective of the invention is to propose a kind of method and system, be used to attempt that settlement server can run into may misread when being notified the QoS information of one or more network PDP Contexts by client computer.
Another object of the present invention is to adjust sending to streaming data and/or signaling so that the service quality of optimization to be provided.
Another object of the present invention relates to the UNC problem that exists in 3GPP and 3GPP2.
The objective of the invention is by using different types of method with signal transmission parameter to realize, these methods are used for permitting session character to client computer to server notification by network.
The present invention has introduced signaling and the new header that is used for the cordless communication network type.The cordless communication network type information is available on moving only.The present invention proposes this information is transferred to server from receiver.
The present invention compares with method with prior art system has advantage.The present invention has allowed to make streaming server to know the qos parameter of permitting for each PDP Context.This is just by specifying more accurate QoS profile parameter to allow better and self adaptation more accurately.
The present invention also allows streaming server to know the network type that Wireless Telecom Equipment is used, and this has further improved service quality.Because the present invention, server also can be constructed the signaling of following 3GPP/3GPP2 rightly.
The present invention has removed owing to single/a plurality of PDP Contexts are used for the flow transmission session and are sent the conflict that qos parameter occurs to server with signal by client computer.
If do not have to use the process of describing in the present invention, then Multimedia session can't be benefited from qos parameter information, makes professional quality that the risk of degradation seriously be arranged and replace.
The present invention has used wireless streams transmission notion, and by utilizing the agreement and the coding decoder of 3GPP and 3GPP2 special use, has improved the transmission of multimedia streams performance and to the self adaptation of wireless domain.
Another important advantage is to be calculated as maximum bit rate by using effectively---the delta bandwidth of the bit rate of assurance is given.This bandwidth can be used for bandwidth self-adaption or be used to handle video bits speed peak value.At last, this delta bandwidth can be used for for example by change the coding parameter that is in operation (comprising the Media Stream bit rate) that bit rate has influence being sent best media quality when in real time media stream being encoded.
Description of drawings
Hereinafter, the present invention is described more specifically with reference to the accompanying drawings, in the accompanying drawings:
Fig. 1 shows wherein can use the system of method according to the preferred embodiment of the invention,
Fig. 2 has illustrated Wireless Telecom Equipment according to the preferred embodiment of the invention in the block diagram of simplifying,
The QoS that Fig. 3 shows the client computer that is used to have single PDP Context keeps and session control signaling figure, and
Fig. 4 shows the QoS that is used to have the client computer that a plurality of PDP Contexts support to be kept and session control signaling figure.
Embodiment
In the following description to the preferred embodiment of the present invention, UMTS type mobile communication terminal will be used as example; Yet, will be obvious that to those skilled in the art the present invention is limited to this system uniquely, and in its other other communication system of various QoS levels (for example EGPRS) that also can be applied to wherein might be identified for communicating by letter.
More specifically descriptive session is described agreement (SDP) hereinafter.
On internet multicast backbone (Mbone), the session directory instrument is used for announcing multimedia conferencing and passes on necessary meeting address and the media-specific information of participating in.The multicast backbone is a part of supporting the internet of IP (Internet protocol) multicast, therefore allows effective many-many communication.It is widely used for carrying out multimedia negotiation.Such meeting has the dispensable character of close coordination of conference member usually; In order to receive meeting, the user who is positioned at multicast backbone website only need know meeting multicast group address and the udp port that is used for conference traffic.
Session directory auxiliary to the bulletin of conference session with relevant meeting is set up information be communicated to the expection participant.SDP is designed to such information is transported to the recipient.SDP is the form that is used for conversation description purely---it does not have in conjunction with transportation protocol, and can be with comprising session announcement protocol, Session initiation Protocol, real time streaming transport protocol (RTSP), using the Email of MIME expansion and the different agreement of HTTP to transport.
SDP is intended to be used for general service, makes it can be used for than only being wider general network environment of multicast conversation catalogue and application,
To be two or more communication equipments of communicating by letter be used for the set of the software of communicating by letter together with them to multimedia conferencing.Yet, become clearly, other so suitable application of for example video conference can be arranged.
Multimedia session is multimedia reflector and receiver and the set that flows to the data flow of receiver from reflector.Multimedia conferencing is the example of Multimedia session.
Some details of the current definition of agreement hereinafter descriptive session are described.Some descriptions of this agreement are essential, and some descriptions are optional.Selectable items be marked with '
*'.
Conversation description
V=(protocol version)
O=(owner/founder and Session ID)
S=(session name)
I=
*(session information)
U=
*(URI of description)
E=
*(e-mail address)
P=
*(telephone number)
C=
*(if link information---be contained in all medium then do not require)
B=
*(bandwidth information)
One or more times are described (seeing below)
Z=
*(time zone adjustment)
K=
*(encryption key)
A=
*(zero or a plurality of session attribute are capable)
Zero or a plurality of media description (seeing below)
Time describes
T=(time of session activation)
R=
*(zero or a plurality of repetition time)
Media description
M=(media name and transfer address)
I=
*(media streams)
C=
*(if link information---be contained in session level then optional)
B=
*(bandwidth information)
K=
*(encryption key)
A=
*(zero or a plurality of medium property are capable)
According to above-mentioned document, bandwidth is described and is defined as follows:
B=＜modification symbol 〉:＜bandwidth-value 〉
This has specified the proposal bandwidth that will be used by session or medium and has been optional.
＜bandwidth-value〉acquiescence unit be kilobits per second.Revise to accord with to specify and to use optional unit.
＜revise according with〉be the single alphanumeric individual character of giving bandwidth numeral implication.Initially define two and revise symbol:
CT (meeting total): implicit bandwidth then should be session and provides ' b=CT ' OK if the bandwidth of the medium in session or the session is different from according to scope, for institute's dedicated bandwidth is given the proposal upper limit.The main purpose of doing like this is to give and the relevant roughly viewpoint of two or more sessions that whether can coexist simultaneously.
AS (maximum of application specific): this bandwidth is interpreted as application specific, and promptly this bandwidth will be the maximum bandwidth notion of this application.Usually this (if being suitable for) conflict mutually that will be provided with controlling at ' maximum bandwidth ' used.For the application based on RTP, AS has provided the RTP " session bandwidth " (comprising medium bit rate and UDP/IP header overhead) as definition in RFC 1889 the 6.2nd part (RTP).
Real time streaming transport protocol (RTSP) is the client-server agreement of controlling of sending that is used for data with real-time.It is used to set up and the single of the continuous media of control ratio as Voice ﹠ Video or several time synchronized stream.RTSP uses such as UDP and the such transportation protocol of TCP to transport.In other words, RTSP serves as the network remote control for multimedia server.Data source can comprise the montage (for example still image) of live feeds of data (for example real-time video and/or audio frequency) and storage.The RTSP client-server is consulted suitable parameter set by for example partly using SDP (Session Description Protocol) grammer that the parameter that is used for media-delivery is described.
Fig. 1 shows the part of UMTS system, comprising: Wireless Telecom Equipment MT1; Radio access node 1 (RAN), it comprises base station 2 (BS) and radio network controller 3 (RNC), this radio network controller 3 control base stations 2 and be base station 2 with the remainder of system between be connected pathfinding by; Wireless mobile switching centre 4 (WMSC) and grouped data access node 5 (PDAN), except radio network controller 3, this is wireless mobile switching centre 4 and this grouped data access node 5 also as pathfinding by may.Also comprise backbone network 6 for example and lead to packet data gateway 8 (PDG) that according to the UMTS system of Fig. 1 wherein Wireless Telecom Equipment can be communicated by letter with the server 10 that for example is coupled to IP network such as other such packet network of Internet protocol (IP) network 7.In addition, Fig. 1 shows in order to be coupled to the circuit switched gateway 9 of the second mobile communications network NW2 for example and (leads to and move the gateway of serving switching center, GWMSC) and for example in order to the attaching position register 11 (HLR) of the access contact data of store subscriber.
In addition, Fig. 2 has illustrated the Wireless Telecom Equipment MT1 according to the preferred embodiment of the present invention in the block diagram of simplifying, and this equipment is the communication equipment that comprises data processing function and travelling carriage function in this example, such as Nokia 9210i communicator.Wireless Telecom Equipment MT1 comprises for example one or more processor CPU, DSP, storage arrangement MEM, UMTS Subscriber Identity Module (USIM) or is used to identify subscriber's corresponding intrument, and is used for the radio frequency part RF that communicates by letter with base station 2.Processor CPU for example can be integrated in the application-specific integrated circuit (ASIC) 12 (ASIC), utilizes it just can carry out a large amount of logic functions of Wireless Telecom Equipment MT1.Storage arrangement preferably includes at least a portion memory of random-access memory (ram), read-only memory (ROM) and Subscriber Identity Module USIM.Wireless Telecom Equipment MT1 also comprises one or more user interfaces, preferably includes the such audio devices of keypad 13,14, display device 15,16 and for example microphone 17, loud speaker 18 and coding decoder 19.
In Fig. 1, suppose to be implemented among the Wireless Telecom Equipment MT1 and wireless mobile switching centre 4 and grouped data access node 5 in the two with call manager (CM) function associated.These call management functionality are configured for initialization, keep the means with end call.Therefore, Wireless Telecom Equipment MT1 and wireless mobile switching centre 4 or grouped data access node 5 switched call signaling messages with initialization, keep and end call.The function of bearer management (BM) and RRM (RM) be implemented among the Wireless Telecom Equipment MT1 and radio network controller 3 in.The bearer management function for example is used to according at selecting one or several logic channels at Wireless Telecom Equipment MT1 with the carrying servicing property of selecting of communicating by letter between the base station 2, serves the service quality that conforms to provide with carrying.Radio resource management function for example is used for selecting wireless channel for the radio communication between Wireless Telecom Equipment MT1 and the base station 2.
Be connected and set up from grouped data access node 5 (PDAN) via grouped data backbone 6 and packet data gateway 8 (PDG) with packet data transmission between the IP network 7 at Wireless Telecom Equipment MT1.Might be via radio access node 1, wireless mobile switching centre 4 and lead to and move the gateway 9 (GWMSC) serve switching center and between Wireless Telecom Equipment MT1 and mobile communications network, set up circuit-switched transfer to be connected.This leads to and moves the gateway serve switching center and comprise and be used for setting up the device that is connected between mobile communications network and the second network N W2 such such as GSM, PTSN or ISDN.
Hereinafter, with reference to the system of Fig. 1 and the signaling diagram of Fig. 3 and Fig. 4 the method according to the preferred embodiment of the invention that is used for the flow transmission multimedia application is described.Following enforcement is based on the use to the RTSP agreement.Equally, " QoSParams, MaxBW, GuaBW, TdelayMax and url " parameter is imaginary parameter name, and these parameter names are conceptual placeholders for foregoing invention.They can in the enforcement of reality, be preced with different titles.
At first define some terms.Client computer is Wireless Telecom Equipment MT1, and server is the flow transmission multimedia service supplier (for example server among Fig. 1 10) to client computer.Multimedia session is following time interval, and during this time interval, the data relevant with multimedia exchange between client computer and server.The Multimedia session stage of setting up is following time interval, during this time interval, client-server exchange is relevant with Multimedia session sets up information, the multimedia composition that for example will use during session, bandwidth information, the information relevant with the multimedia coding decoder etc.PDP Context is the logic indication to abstract constraint between the travelling carriage of QoS resource reservation process and this flow transmission client computer of operation.
Client computer can be in the network N W1 with QoS (service quality) function, and this network can provide some assurances to client computer based on its resource.One or more assurances in guaranteeing below these assurances can cover:
-maximum bit rate (MaxBW): can be by maximum bandwidth through the medium of consulting are formed or the whole multimedia session is used.
The bit rate (GuaBW) of-assurance: the QoS retention process is at the bandwidth value that medium are formed or the whole multimedia session guarantees to client computer through negotiation.
-propagation delay (TDelayMax): each data cell is in the delay (unit is millisecond) from experiencing between server to client machine and opposite transmission period.
-also can define other parameter, but be not described in detail them here.
The present invention has covered that client computer has the ability of a plurality of or single PDP Context based on it during Multimedia session and two different possibilities that may experience.
At first, will more specifically be described below situation, client computer once can only be handled single PDP Context in this case.In other words, the client computer with single PDP Context support once can have single QoS resource and keep, and this will form (being audio frequency, video etc.) across all medium during the Multimedia session.This means that multi-medium data is that data such as video or audio frequency are all shared the same transmission channel with identical QoS resource.
In first sight, for activating, Wireless Telecom Equipment MT1 (client computer) assembles controlled session, and this equipment only has single PDP Context support for the flow transmission session.In this sight, if having, Wireless Telecom Equipment MT1 to form (for example audio frequency also is attended by video flowing) for a plurality of medium that session is set up, then owing to the problem of describing in the application's background technology part, client computer sends such as the bit rate GuaBW of maximum bit rate MaxBW, assurance, maximum propagation delay TdelayMax such negotiation qos parameter and any other QoS profile parameter to server 10 during being taken in and setting up the stage.
In the QoS consultation parameter must be activated in the transmission of stream or send to server afterwards, promptly be transferred in the server 10 or send to server afterwards from Wireless Telecom Equipment MT1 in the Play order.
Command sequence can following (Fig. 3):
Wireless Telecom Equipment MT1 arrives server 10 with descriptive session command transfer 301.
DESCRIBE rtsp：//server.com/session1.3gp RTSP/1.0
CSeq：1
Accept：application/sdp
Server 10 is described answer is made in this order by transmitting 302 SDP that comprise the information relevant with different Media Streams.
RTSP/1.0 200 OK
CSeq：1
Content-Base：rtsp：//server.com/session1.3gp/
Content-Type：application/sdp
Content-Length：441
v＝0
o＝-3242987154 3242987154 IN IP4 111.111.111
s＝session1.3gp
c＝IN IP4 0.0.0.0
t＝0 0
a＝control：*
a＝range：npt＝0-60
m＝video 0 RTP/AVP 96
b＝AS：50
a＝rtpmap：96 H263-2000/90000
a＝control：trackID＝2
a＝range：npt＝0-80
a＝fmtp：95 profilo＝0；level＝10
m＝video 0 RTP/AVP 98
b＝AS：40
a＝rtpmap：98 H263-2000/90000
a＝control：trackID＝3
a＝range：npt＝0-60
a＝fmtp：98 profile＝0；level＝10
m＝audio 0 RTP/AVP 97
b＝AS：10
a＝rtpmap：97 AMR/8000/1
a＝control：trackID＝1
a＝range：npt＝0-60
a＝fmtp：97 octet-align＝1
m＝audio 0 RTP/AVP 99
b＝AS：20
a＝rtpmap：99 AMR-WB/16000
a＝control：trackID＝4
a＝range：npt＝0-60
a＝fmtp：99 octet-align＝1
During superincumbent SDP described, video 1 had the b=AS definition of 50kbps, and video 2 has the b=AS definition of 20kbps, and audio frequency 1 has the b=AS definition of 10kbps, and audio frequency 2 has the b=AS definition of 20kbps.
Then, in Wireless Telecom Equipment MT1, for example among the medium of being notified, select, to select to be transferred to the stream of Wireless Telecom Equipment MT1 by the user.In this example, suppose video 1 (50kbps) and audio frequency 2 (20kbps) that selection has the total bit rate of 70kbps.After this, Wireless Telecom Equipment sends 303 requests for the carrying service to communication network NW1.Wireless Telecom Equipment MT1 comprises that all medium form needed qos parameter (maximum bit rate of 70kbps) in this request.
In this example, network only can guarantee 60kbps and realize the maximum bit rate of 80kbps.Then, network N T1 notifies the 304 granting qos parameters that are used to the service of carrying to Wireless Telecom Equipment MT1.With network negotiate be used for the carrying service of PDP session after, Wireless Telecom Equipment MT1 sets up transmission of messages 305 to be used to notify selected first Media Stream to server 10 with first, promptly video 1.
SETUP rtsp：//server.com/session1.3gp/trackID＝2 RTSP/1.0
CSeq：2
Transport：RTP/AVP/UDP；unicast；client_port＝6984-6985；ssrc＝31336d02
If select OK, then server 10 is made with OK message and is answered 306.
RTSP/1.0 200OK
CSeq：2
Session：41
Transport：RTP/AVP/UDP；unicast；client_port＝6984-6985；server_port＝6900-
6901；ssrc＝1d12115
Wireless Telecom Equipment MT1 also sets up transmission of messages 307 to be used to notify selected second Media Stream to server 10 with second, and promptly audio frequency 2.
SETUP rtsp：//server.com/session1.3gp/trackID＝4 RTSP/1.0
CSeq：3
Transport：RTP/AVP/UDP；unicast；client_port＝6986-6987；ssrc＝37115e8d
Session：41
If select OK, then server 10 is made with OK message and is answered 308.
RTSP/1.0 200 OK
CSeq：3
Session：41
Transport：RTP/AVP/UDP；unicast；client_port＝6986-6987；server_port＝6902-
6903；ssrc＝7475313
The playback of Media Stream is by initiating from Wireless Telecom Equipment MT1 transmission 309 Play order to server 10.In the case, with what Play order was included in information about qos parameter arranged at least, these parameters have related to the maximum bit rate that network N T1 permitted and the bit rate of assurance.
PLAY rtsp：//server.com/session1.3gp RTSP/1.0
CSeq：4
Session：41
QoSParams：MaxBW＝80；GuaBW＝60；TDelayMax＝500
Range：npt＝0-
Server comes answer is made in this order by OK being sent to Wireless Telecom Equipment MT1.
RTSP/1.0 200 OK
CSeq：4
Session：41
Range：npt＝0-
RTP-Info：
url＝rtsp：//server.com/session1.3gp/trackID＝2；seq＝0；rtptime＝10000，url＝
rtsp：//server.com/session1.3gp/trackID＝4；seq＝0；rtptime＝10000
Now, when server 10 has received Play when order, it just knows and exists single QoS channel, this channel to have the qos parameter that is sent with signal by Wireless Telecom Equipment MT1, and server 10 can adapt to transmission to selected Media Stream according to parameter.
After the Play order, it is the qos parameter of whole multimedia session updates through negotiation that Wireless Telecom Equipment MT1 can use any other RTSP that defines within the context of flow transmission system to order.
If Multimedia session is the controlled session of non-gathering (for example from two independent server retrieves Voice ﹠ Video data), then Wireless Telecom Equipment MT1 should not send qos parameter, because independent media server is not known mutually, they do not know that media groups becomes to share the fact that same QoS keeps channel yet.
Then, will more specifically be described below situation, in this case, client's function is once supported a plurality of PDP Contexts.In other words, the client computer with a plurality of PDP Context supports can once have and can keep forming a plurality of QoS resources that distribute between (being audio frequency, video etc.) at medium during the Multimedia session.During Multimedia session, form (being audio frequency, video etc.) and just independent Multimedia session can be arranged for each medium.All medium are formed can have different QoS resource reservations.
In second sight, if having a plurality of medium that will set up for session, Wireless Telecom Equipment MT1 forms, if Wireless Telecom Equipment MT1 wishes to form a plurality of PDP Contexts of activation for different medium, if not allowing medium to form the url designator, session control protocol between medium are formed, do not distinguish, then Wireless Telecom Equipment MT1 is not taken in the Play order MaxBW, GuaBW, TDelayMax and other QoS profile parameter that QoS consults is sent to server, and this will most possibly be the addition of these parameters.Replace, qos parameter should each medium form set up the stage during be sent out.
Command sequence can following (Fig. 4):
Wireless Telecom Equipment MT1 arrives server 10 with descriptive session command transfer 401.
DESCRIBE rtsp：//server.com/session1.3gp RTSP/1.0
CSeq：1
Accept：application/sdp
Server is described answer is made in this order by transmitting 402 SDP that comprise the information relevant with different Media Streams.
RTSP/1.0 200 OK
CSeq：1
Content-Base：rtsp：//server.com/session1.3gp/
Content-Type：application/sdp
Content-Length：441
v＝0
o＝.3242987154 3242987154 IN IP4 111.111.111
s＝session1.3gp
c＝1N IP4 0.0.0.0
t＝0 0
a＝control：*
a＝range：npt＝0-60
m＝video 0 RTP/AVP 96
b＝AS：50
a＝rtpmap：96 H263-2000/90000
a＝control：trackID＝2
a＝range：npt＝0-60
a＝fmtp：96 profile＝0；level＝10
m＝video 0 RTP/AVP 98
b＝AS：40
a＝rtpmap：98 H263-2000/90000
a＝control：trackID＝3
s＝range：npt＝0-60
a＝fmtp：98 profile＝0；level＝10
m＝audio 0 RTP/AVP 97
b＝AS：10a＝rtpmap：97 AMR/8000/1
a＝control：trackID＝1
a＝range：npt＝0-60
a＝fmtp：97 octet-align＝1
m＝audio 0 RTP/AVP 99
b＝AS：20
a＝rtpmap：99 AMR-WB/16000
a＝control：trackID＝4
a＝range：npt＝0-60
a＝fmtp：99 octet-align＝1
During superincumbent SDP described, video 1 had the b=AS definition of 50kbps, and video 2 has the b=AS definition of 20kbps, and audio frequency 1 has the b=AS definition of 10kbps, and audio frequency 2 has the b=AS definition of 20kbps.
Then, in Wireless Telecom Equipment MT1, for example among the medium of being notified, select, to select to be transferred to the stream of Wireless Telecom Equipment MT1 by the user.In this example, supposed to select to have the video 1 of 50kbps bit rate and audio frequency 2 with 20kbps bit rate.After this, Wireless Telecom Equipment sends 403 first requests for the first carrying service to communication gate NW1.Wireless Telecom Equipment MT1 has comprised first medium and has formed (video 1) required qos parameter (bit rate of the assurance of 50kbps) in this request.In this example, network only can guarantee 50kbps and realize the maximum bit rate of 80kbps.Then, network N T1 notifies 404 qos parameters for the permission of the first carrying service to Wireless Telecom Equipment MT1.Then, Wireless Telecom Equipment sends 405 second requests for the second carrying service to communication network NW1.In this request, Wireless Telecom Equipment MT1 has comprised second medium and has formed (audio frequency 1) required qos parameter (bit rate of the assurance of 20kbps).In this example, network only can guarantee 20kbps and realize the maximum bit rate of 40kbps.Then, network N T1 notifies 406 qos parameters for the permission of the second carrying service to Wireless Telecom Equipment MT1.With network negotiate be used for the carrying service of PDP session after, Wireless Telecom Equipment MT1 is provided with transmission of messages 407 with first and is used to notify selected first Media Stream to server 10, promptly video 1.
SETUP rtsp：//server.com/session1.3gp/trackID＝2 RTSP/1.0
CSeq：2
Transport：RTP/AVP/UDP；unicast；client_port＝6984-6985；ssrc＝31336d02
QoSParams：url＝
rtsp：∥server.com/session1.3gp/trackID＝2；MaxBW＝80；GuaBW＝50；TDelayM
ax＝500
If select OK, then server 10 answers 408 with OK message.
RTSP/1.0 200 OK
CSeq：2
Session：41
Transport：RTP/AVP/UDP；unicast；client_port＝6984-6985；server_port＝6900-
6901；ssrc＝1d12115
Wireless Telecom Equipment MT1 also is provided with transmission of messages 409 with second and is used to notify selected second Media Stream to server 10, and promptly audio frequency 2.
SETUP rtsp：//server.com/session1.3gp/trackID＝4RTSP/1.0
CSeq：3
Transport：RTP/AVP/UDP；unicast；client_port＝6986-6987；ssrc＝37115e8d
Session：41
QoSParams：MaxBW＝40；GuaBW＝20；TDelayMax＝600
If select OK, then server 10 answers 410 with OK message.
RTSP/1.0 200OK
CSeq：3
Session：41
Transport：RTP/AVP/UDP；unicast；client_port＝6986-6987：server_port＝6902-
6903；ssrc＝7475313
The playback of Media Stream is by initiating from Wireless Telecom Equipment MT1 transmission 411 Play order to server 10.
PLAY rtsp：//server.com/session1.3gp RTSP/1.0
CSeq：4
Session：41
Range：npt＝0-
In this case, the Play order not packets of information relevant with qos parameter contains together, and wherein these parameters have related to the maximum bit rate that network N T1 permitted and the bit rate of assurance.
Server comes answer is made in this order by OK being sent to Wireless Telecom Equipment MT1.
RTSP/1.0 200 OK
CSeq：4
Session：41
Range：npt＝0-
RTP-Info：
url＝rtsp：//server.com/session1.3gp/trackID＝2；seq＝0；rtptime＝10000，url＝rts
p：//server.com/session1.3gp/trackID＝4；seq＝0；rtptime＝10000
Alternatively, in RTSP PLAY request, Wireless Telecom Equipment mT1 may finish following:
PLAY rtsp：//server.com/session1.3gp RTSP/1.0
CSeq：4
Session：41
Range：npt＝0-
QoSParams： url＝
rtsp：//server.com/session1.3gp/trackID＝2；MaxBW＝80；GuaBW＝50；TDelayM
ax＝500，url＝
rtsp：//server.com/session1.3gp/trackID＝4；MaxBW＝40；GuaBW＝20；TDelayM
ax＝500
Now, which qos parameter server can be discerned and distribute to which medium composition based on its medium composition URL.
Server->Client：OK
RTSP/1.0 200 OK
CSeq：4
Session：41
Range：npt＝0-
RTP-Info：
url＝rtsp：//server.com/session1.3gp/trackID＝2；seq＝0；rtptime＝10000，url＝rta
p：//server.com/session1.3gp/trackID＝4；seq＝0；rtptime＝10000
Now, when server 10 has received Play when order, it is just known and exists a plurality of QoS channels, these channels to have the independent qos parameter that is sent with signal by Wireless Telecom Equipment MT1.To have for each PDP Context be effective its QoS consultation parameter collection because each medium is formed, so the server right value to be distributed safely is assigned to correct QoS negotiated channel with each media groups one-tenth.
Client computer also can provide the information relevant with cordless communication network to server, and wherein server needn't have this information, because it is available on client-side.According to the present invention, about the information of network type from the client transmission to the server.For this reason, the invention provides new RTSP header " Mobile-Link-Char " and the signaling that is used for this header.
As described, " Mobile-Link-Char " header is in order to make the transmission of multimedia streams server/client define to streaming server reporting ent feature.Arbitrary method during " Mobile-Link-Char " header can make with the following method is contained in the request: SETUP, PLAY, OPTIONS and SET PARAMETER.This header can comprise one or more characteristic criterions.It can be absolute or relative URI that each standard comprises, and any relative URI uses RTSP request URI as the basis.URI has pointed out that the medium that parameter was applied to that provide form.This can be that independent Media Stream or session assembled." Mobile-Link-Char " header should be contained among SETUP or the PLAY to provide the initial value that is used for link characteristics by client package.SET PARAMETER or OPTIONS request can be used for being updated in the Mobile-Link-Char value in the session of current broadcast.
Covering in " Mobile-Link-Char " is the field MNT that is used for mobile network's type, this Field Definition be used to send the cordless communication network of signal.Together with " MNT " also other parameter can be arranged, such as GBW, to be used for kbit/s be the forward link user data rate of unit; And MTD, being used for the millisecond is the forward link maximum delay of unit; And MBW, being used for kbit/s is the forward link maximum bit rate of unit.Other parameter of except that above-mentioned parameter some also can cover header.
Form according to following example according to " MNT " of the present invention field:
MNT=＜standard body 〉-＜network type ID 〉-＜distribution of information 〉
" standard body " is used to identify map network, for example 3GPP or 3GPP2.The suitable signaling that this allows server constructs to conform to the network of being discussed.
Effective string in " MNT " network type field can for example be EGPRS, W-CDMA, CDMA2000, and " MNT " distribution of information is relevant network release version.For 3GPP, " network type ID " corresponding to EGPRS or W-CDMA (Wideband Code Division Multiple Access (WCDMA)), for 3GPP2 then corresponding to HRPD (High Rate Packet Data) or SSS (spread spectrum system).For 3GPP, " distribution of information " corresponding to REL-x (wherein x be numeral), for 3GPP2 then corresponding to REL-y (wherein y be 0, A, B, C etc.).Only enumerated the field that is used for " standard body " and " network type ID " for reference purpose.Clearly, when not departing from the scope of the present invention, newer interpolation can be implemented in these fields.
For example, for the network of following 3GPP2 (for 1 * EV-DV), header is as follows:
Mobile-Link-Char： url＝”rstp：//server.example.com/media.3g2”；
MNT＝3GPP2-SSS-REL-C
Another example be follow the network of 3GPP2 (1 * EV-DO), wherein header is as follows:
Mobile-Link-Char： url＝”rstp：//server，example.com/media.3g2”；
MNT＝3GPP2-HRPD-REL-0
Another example is to follow the network of 3GPP, and wherein header is as follows:
Mobile-Link-Char： url＝”rstp：//server.example.com/media.3gp”；
MNT＝3GPP-EGPRS-REL-5
Again an example be follow the network of 3GPP (1 * EV-DV), the header that wherein has other parameter (bit rate be 32kbps and maximum propagation delay is 2.0 seconds) is as follows:
Mobile-Link-Char： url＝”rstp：//server，example.com/media.3gp”；
MNT＝3GPP-CDMA2000-Rev-C；GBW＝32；MTD＝2000
Server can be inferred that client computer is being followed on which network in the network of 3GPP or 3GPP2 according to " MNT " field and be moved.Because this point, it can be to come client computer is made response for RTSP, DP, appropriate grammer and other signaling of RTCP.The differentiation that term 1 * EV-DV and 1 * EV-DO transmit corresponding to data (be accordingly data and voice, only data).
If QoS having occurred for specific PDP Context (being that specific medium are formed) consults again, then client computer can be formed through the medium that occur changing by correctly quoting for it, use the arbitrary order in the available RTSP order, come to send new qos value with signal.
Distinguish between medium are formed if session control protocol allows medium to form the url designator, then also can send qos parameter with signal in the Play request.Following pseudo-command sequence shows possible scheme:
Client->Server：Setup(media component 1)
Server->Client：OK
Client->Server：Setup(media component 2)
Server->Client：OK
Client->Server：Play(URL of media component 1+Negotiated QoS
parameters for the media component 1：URL of media component 2+
Negotiated QoS parameters for the media component 2)
Server->Client：OK
In last example, server can by use " medium are formed URL " information come medium form and the qos parameter that distributes for each composition between distinguish.This field is the unique identifier that medium are formed in the session.If client-server can be utilized such parameter, then Wireless Telecom Equipment MT1 can be chosen in the Set-Up stage or send qos parameter in the Play stage.If QoS consult again, then this medium form the URL designator also to Wireless Telecom Equipment MT1 given during session, upgrade qos parameter may.
If Multimedia session is the controlled session of non-gathering (for example from two independent server retrieves Voice ﹠ Video data), then client computer can send the QoS consultation parameter with signal safely in Set-Up order and Play order, because for each medium composition independent Play order will be arranged.
Also may exist medium to form url field in order to sign session URL in first example, but still effective about the restriction that does not send qos parameter in the Set-Up stage for this situation.
If qos parameter set does not comprise medium and forms URL, then the request URL of flow transmission control protocol must be used as the main URL that distributes for qos parameter.
RTSP is used as method for optimizing in specification.Other externalist methodology also is possible with becoming clearly.Example described herein only provides the sample of part signaling, and other form of this signaling still within the scope of the present invention.In order to understand this point, will become clearly parameter name and network type also can change with situation.
Clearly, the embodiment that the present invention is not limited only to present above, and can retrofit to the present invention within the scope of the appended claims.
Claims (25)
1. the method in the communication system comprises:
Selection will be transferred at least one Media Stream of received communication equipment at least in part from the transmission communication equipment via cordless communication network;
Definition is for the qos requirement of described selected at least one Media Stream of transmission;
Keep transfer resource from described cordless communication network and be used to transmit described at least one Media Stream;
Between described received communication equipment and described transmission communication equipment, carry out and be used to activate the process of setting up that a packet data transmission is connected;
Begin to transmit described at least one Media Stream by described received communication device request; And
Selected at least one Media Stream is transferred to described received communication equipment from described transmission communication equipment, and described transmission comprises:
When selected at least one Media Stream of transmission, use a transfer of data context, wherein begin to transmit in described at least one Media Stream or at it after, the message transmission relevant with described reservation of resource arrived described transmission communication equipment in described request.
2. method according to claim 1 comprises that definition is used for the following at least parameter that described transfer of data connects:
-maximum bit rate,
The bit rate of-assurance,
-propagation delay;
And described parameter is notified to described transmission communication equipment.
3. method according to claim 1, be included in by described received communication device request begin to transmit in described at least one Media Stream or after it with the message transmission relevant with described cordless communication network type to described transmission communication equipment.
4. the method in the communication system comprises:
Selection will be at least in part via cordless communication network from sending at least one Media Stream that communication equipment is transferred to received communication equipment,
Definition for the transmission described selected at least one Media Stream qos requirement,
Keep transfer resource from described cordless communication network and be used to transmit described at least one Media Stream,
Between described received communication equipment and described transmission communication equipment, carry out and set up process to be used to activate at least one packet data transmission to be connected,
Begin to transmit described at least one Media Stream by described received communication device request, and
Media Stream is transferred to received communication equipment from described transmission communication equipment, and described transmission comprises:
Use a transfer of data context for each selected Media Stream, wherein relevant with described reservation of resource information and the described process of setting up are transferred to described transmission communication equipment with interrelating.
5. the method in the communication system, wherein Media Stream is transferred to received communication equipment via cordless communication network from sending communication equipment at least in part, wherein select to be transferred at least one Media Stream of described received communication equipment, definition is used to transmit the cordless communication network type of described selected at least one Media Stream, keep transfer resource from described cordless communication network and be used to transmit described at least one Media Stream, between described received communication equipment and described transmission communication equipment, carry out and be used to activate the setting up procedure that a packet data transmission is connected, and begin to transmit described at least one Media Stream by described received communication device request, and when selected at least one Media Stream of transmission, use a transfer of data context, wherein begin to transmit in described at least one Media Stream by described received communication device request or after it with the message transmission relevant with described cordless communication network type to described transmission communication equipment.
6. method according to claim 5 wherein connects at least one parameter that definition is used to define described cordless communication network type for described transfer of data.
7. method according to claim 6, wherein definition is issued relevant information with network standard, network type and network at least.
8. the method in the communication system comprises:
By the received communication device request with at least in part via cordless communication network with at least one Media Stream from sending the relevant information of qos requirement that communication equipment is transferred to described received communication equipment;
Be used to transmit described at least one Media Stream by described received communication equipment from described cordless communication network request transfer resource;
The resource that is preserved for transmitting by described cordless communication network and with the message transmission relevant with described reservation of resource to described received communication equipment;
Carry out by described received communication equipment and described transmission communication equipment and to be used to activate the process of setting up that a described packet data transmission is connected;
Be transferred to described transmission communication equipment and ask to begin to transmit described at least one Media Stream by transmitting initiation command by described received communication equipment, the information relevant with described reservation of resource also is transferred to described transmission communication equipment in described order; And
Use a packet data transmission to connect Media Stream is transferred to described received communication equipment from described transmission communication equipment.
9. the method in the communication system comprises:
By received communication device request and the relevant information of qos requirement that via cordless communication network at least one Media Stream is sent to described received communication equipment at least one packet data transmission of use from the transmission communication equipment with being connected to small part;
Be used to transmit described at least one Media Stream by described received communication equipment from described cordless communication network request transfer resource;
The resource that is preserved for transmitting by described cordless communication network;
The message transmission relevant with described reservation of resource arrived described received communication equipment;
Carry out by described received communication equipment and described transmission communication equipment and to be used to activate the process of setting up that described at least one packet data transmission is connected;
The described process of setting up comprises:
By described received communication equipment with the message transmission relevant with described reservation of resource to described transmission communication equipment, and
Be transferred to described transmission communication equipment and ask to begin to transmit described at least one Media Stream by transmitting initiation command by described received communication equipment, message transmission not relevant with described reservation of resource in described order is to described transmission communication equipment;
Wherein said method also comprises Media Stream is transferred to described received communication equipment from described transmission communication equipment.
10. communication system comprises being used at least in part via cordless communication network Media Stream from sending the device that communication equipment is transferred to received communication equipment that described communication system also comprises:
Be used to select to be transferred to the device of at least one Media Stream of described received communication equipment,
Be used to define device for the qos requirement of described selected at least one Media Stream of transmission,
Be used for keeping the device that transfer resource is used to transmit described at least one Media Stream from described cordless communication network,
Be used between described received communication equipment and described transmission communication equipment, carrying out and be used to activate the device of setting up process that a packet data transmission is connected,
Be used for beginning to transmit the device of described at least one Media Stream by described received communication device request,
Be used for when selected at least one Media Stream of transmission, using the contextual device of transfer of data, and
Be used for begin to transmit in described at least one Media Stream by described received communication device request or after it with the device of the message transmission relevant to described transmission communication equipment with described reservation of resource.
11. communication system according to claim 10, comprise be used for begin to transmit in described at least one Media Stream by described received communication device request or after it with the device of the message transmission relevant to described transmission communication equipment with described cordless communication network type.
12. a communication system, comprise be used to use at least one packet data transmission be connected to small part ground via cordless communication network with Media Stream from sending the device that communication equipment is transferred to received communication equipment, described communication system also comprises;
Be used to select to be transferred to the device of at least one Media Stream of described received communication equipment,
Be used to define device for the qos requirement of described selected at least one Media Stream of transmission,
Be used for keeping the device that transfer resource is used to transmit described at least one Media Stream from described cordless communication network;
Be used between described received communication equipment and described transmission communication equipment, carrying out and be used to activate the device of setting up process that described at least one packet data transmission is connected,
Be used for beginning to transmit the device of described at least one Media Stream by described received communication device request,
Be used for when selected at least one Media Stream of transmission, using the contextual device of transfer of data, and
Be used for described set up process interrelate with the message transmission relevant with described reservation of resource to the device of described transmission communication equipment.
13. communication system according to claim 12 comprises the device that is used to define the following at least parameter that is used for described transfer of data connection:
-maximum bit rate,
The bit rate of-assurance,
-propagation delay.
14. communication system according to claim 12, comprise be used for begin to transmit in described at least one Media Stream by described received communication device request or after it with the device of the message transmission relevant to described transmission communication equipment with described cordless communication network type.
15. a transmission communication equipment comprises at least:
The device that is used to the request that receives, described request are used for keeping transfer resource from cordless communication network and are used to transmit at least one Media Stream;
Be used to be preserved for transmit the device of the resource of at least one Media Stream;
Reflector, be used for described at least one media flow transmission to received communication equipment, described reflector is suitable for at least one packet data transmission is connected sets up process to send to set up message with interrelating being used between described received communication equipment and the described transmission communication equipment to activate;
Be used for when selected at least one Media Stream of transmission, using the contextual device of transfer of data; And
Receiver, be suitable for described set up process receive with interrelating with from the relevant information of described reservation transfer resource of described cordless communication network.
16. a received communication equipment comprises at least:
Receiver is used for receiving the Media Stream that uses at least one packet data transmission to transmit via cordless communication network from sending communication equipment with being connected to small part;
Be used to select to be transferred to from described transmission communication equipment the device of at least one Media Stream of described received communication equipment;
Be used to define device for the qos requirement of selected at least one Media Stream of transmission;
Be used for being used to transmit the device of described at least one Media Stream from described cordless communication network request transfer resource;
Be used between described received communication equipment and described transmission communication equipment, carrying out and be used to activate the device of setting up process that described at least one packet data transmission is connected;
Be used for described set up process interrelate with the message transmission relevant with described reservation of resource to the device of described transmission communication equipment;
Be used to ask to begin to transmit the device of described at least one Media Stream from described transmission communication equipment; And
Be used for when selected at least one Media Stream of transmission, using the contextual device of transfer of data.
17. a Wireless Telecom Equipment comprises at least:
Receiver is used for receiving the Media Stream that uses at least one packet data transmission to transmit via cordless communication network from sending communication equipment with being connected to small part;
Be used to select to be transferred to from described transmission communication equipment the device of at least one Media Stream of described Wireless Telecom Equipment;
Be used to define device for the qos requirement of selected at least one Media Stream of transmission;
Be used for being used to transmit the device of described at least one Media Stream from described cordless communication network request transfer resource;
Be used between described Wireless Telecom Equipment and described transmission communication equipment, carrying out and be used to activate the device of setting up process that described at least one packet data transmission is connected;
Be used for described set up process interrelate with the message transmission relevant with described reservation of resource to the device of described transmission communication equipment;
Be used to ask to begin to transmit the device of described at least one Media Stream from selected transmission communication equipment; And
Be used for when described at least one Media Stream of transmission, using the contextual device of transfer of data.
18. Wireless Telecom Equipment according to claim 17 wherein is used for comprising from the device that described cordless communication network request transfer resource is used to transmit described at least one Media Stream being used to define the device of setting up message.
19. Wireless Telecom Equipment according to claim 17 wherein is used to ask comprise from the device that described transmission communication equipment begins to transmit described at least one Media Stream be used to define the device of playing message.
20. wireless communication system according to claim 17, comprise be used for request begin to transmit in described at least one Media Stream or after it with the device of the message transmission relevant to described transmission communication equipment with described cordless communication network.
21. a network element comprises at least:
Be used to receive and device to the relevant information of the selection of at least one Media Stream, described at least one Media Stream will use at least one packet data transmission to be connected to small part ground and be transferred to received communication equipment via cordless communication network;
Be used to receive device for the qos requirement of described selected at least one Media Stream of transmission;
Be used for being used to transmit the device of described at least one Media Stream from described cordless communication network request transfer resource;
Reflector, be used for selected at least one media flow transmission to described received communication equipment, described reflector is suitable for described at least one packet data transmission is connected sets up process to send message is set with interrelating being used between described received communication equipment and the described network element to activate;
Be used for when selected at least one Media Stream of transmission, using the contextual device of transfer of data; And
Receiver, be suitable for described set up process receive with interrelating with from the relevant information of described reservation transfer resource of described cordless communication network.
22. the method in the communication system, wherein Media Stream is transferred to received communication equipment via cordless communication network from sending communication equipment at least in part, wherein select to be transferred at least one Media Stream of described received communication equipment, definition is for the qos requirement of described selected at least one Media Stream of transmission, keep transfer resource from described cordless communication network and be used to transmit described at least one Media Stream, between described received communication equipment and described transmission communication equipment, carry out and be used to activate the process of setting up that a packet data transmission is connected, and begin to transmit described at least one Media Stream by described received communication device request, and when selected at least one Media Stream of transmission, use a transfer of data context, wherein begin to transmit in described at least one Media Stream by described received communication device request or after it with the message transmission relevant with described reservation of resource to described transmission communication equipment.
23. the method in the communication system, wherein Media Stream is transferred to received communication equipment via cordless communication network from sending communication equipment at least in part, wherein select to be transferred at least one Media Stream of described received communication equipment, definition is for the qos requirement of described selected at least one Media Stream of transmission, keep transfer resource from described cordless communication network and be used to transmit described at least one Media Stream, between described received communication equipment and described transmission communication equipment, carry out and be used to activate the process of setting up that at least one packet data transmission is connected, and begin to transmit described at least one Media Stream by described received communication device request, and for transfer of data context of each selected Media Stream use, wherein relevant with described reservation of resource information and the described process of setting up are transferred to described transmission communication equipment with interrelating.
24. the method in the communication system, wherein Media Stream uses a packet data transmission to be connected to small part ground and is transferred to received communication equipment via cordless communication network from sending communication equipment, wherein said received communication device request with for the relevant information of qos requirement that at least one Media Stream is transferred to described received communication equipment from described transmission communication equipment, described received communication equipment is used to transmit described at least one Media Stream from described cordless communication network request transfer resource, wherein said cordless communication network is preserved for the resource of described transmission and the message transmission relevant with described reservation of resource is arrived described received communication equipment, described received communication equipment and described transmission communication equipment are carried out and are used to activate the process of setting up that a described packet data transmission is connected, and wherein said received communication equipment is transferred to described transmission communication equipment and asks to begin to transmit described at least one Media Stream by transmitting initiation command, and the information relevant with described reservation of resource also is transferred to described transmission communication equipment in described order.
25. the method in the communication system, wherein Media Stream uses at least one packet data transmission to be connected to small part ground and is transferred to received communication equipment via cordless communication network from sending communication equipment, wherein said received communication device request with for the relevant information of qos requirement that at least one Media Stream is sent to described received communication equipment from described transmission communication equipment, described received communication equipment is used to transmit described at least one Media Stream from described cordless communication network request transfer resource, the resource that wherein said cordless communication network is preserved for transmitting and with the message transmission relevant with described reservation of resource to described received communication equipment, described received communication equipment and described transmission communication equipment are carried out and are used to activate the process of setting up that described at least one packet data transmission is connected, also the message transmission relevant with described reservation of resource arrived described transmission communication equipment at the described equipment of received communication described in the process of setting up, and wherein said received communication equipment is transferred to described transmission communication equipment and asks to begin to transmit described at least one Media Stream by transmitting initiation command, and the information relevant with described reservation of resource is not transferred to described transmission communication equipment in described order.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US55044304P | 2004-03-04 | 2004-03-04 | |
| US60/550,443 | 2004-03-04 | ||
| US10/876,262 | 2004-06-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1947389A true CN1947389A (en) | 2007-04-11 |
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ID=38045569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800129079A Pending CN1947389A (en) | 2004-03-04 | 2005-03-03 | Method in a communication system, a communication system and a communication device |
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| Country | Link |
|---|---|
| CN (1) | CN1947389A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102067550A (en) * | 2007-10-23 | 2011-05-18 | 皇家Kpn公司 | Method and system for synchronizing a group of end-terminals |
| CN110771102A (en) * | 2017-06-29 | 2020-02-07 | 索尼公司 | Communication system and control device |
-
2005
- 2005-03-03 CN CNA2005800129079A patent/CN1947389A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102067550A (en) * | 2007-10-23 | 2011-05-18 | 皇家Kpn公司 | Method and system for synchronizing a group of end-terminals |
| CN110771102A (en) * | 2017-06-29 | 2020-02-07 | 索尼公司 | Communication system and control device |
| CN110771102B (en) * | 2017-06-29 | 2023-09-22 | 索尼公司 | Communication system and control device |
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Open date: 20070411 |