CN1939008B - Data receiving method and transferring method for data link layer - Google Patents
Data receiving method and transferring method for data link layer Download PDFInfo
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- CN1939008B CN1939008B CN2005800103134A CN200580010313A CN1939008B CN 1939008 B CN1939008 B CN 1939008B CN 2005800103134 A CN2005800103134 A CN 2005800103134A CN 200580010313 A CN200580010313 A CN 200580010313A CN 1939008 B CN1939008 B CN 1939008B
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Abstract
The present invention discloses a data transmission and receiving method at a data link layer for use in a home network system based on a living network control protocol. The data receiving method at the data link layer of a protocol that consists of a physical layer, a data link layer, and an upper layer, includes the steps of: receiving data from the physical layer; storing the received data in a packet buffer; deciding whether new data has been received within a predetermined data allowable interval time since last data is received; and based on a result of the first decision, completing receiving the data.
Description
Technical field
The present invention relates to a kind of data receive method and transfer approach that is used for data link layer, and more specifically, relate to a kind of data receive method and transfer approach that is used for based on the data link layer of the domestic network system of LnCP (living network control protocol).
Background technology
The various digital family equipments of home-network linkups make the user indoor or outdoorly can both enjoy convenient, safe and economic service for life always.Because the development of Digital Signal Processing, the household equipment operation system technology and the high-speed multimedia communication technology have been integrated on the digital family equipment, therefore be called as the refrigerator of white household equipment or washing machine by digitlization step by step, and developed new information home equipment, in order to improve home network.
As shown in table 1, home network is divided into data network according to COS, environment network and living network.
Table 1
| Classification | Function | COS |
| Data network | Network between PC and the peripheral unit | Exchanges data, Internet service etc. |
| Environment network | Network between the A/V device | Music, animation service etc. |
| Living network | Be used to control the network of household equipment | Household equipment control, home automation, remote meter reading, messenger service etc. |
Here, set up data network, in order to swap data between PC and peripheral unit or Internet service is provided, and between the household equipment that uses audio or video information, set up environment network.In addition, set up living network and be only used for controlling household equipment, for example home automation or remote meter reading.
Traditional domestic network system comprises a main device, this main device is an electronic installation, be used to control the operation of other electronic installations or monitor its state, and one from the device, should also be an electronic equipment from device, its function be exactly to respond the request of main device and come notify status to change according to characteristic or other factors of electronic equipment.The typical electronic device comprises household equipment for example washing machine and the refrigerator that is used for living network service, is used for the household equipment of data network service and environment network service, and product for example gas valve control device, automatic door device and electric light.
But conventional art does not propose a general communication standard, is used for providing the function that the electronic installation of domestic network system is controlled and monitored.Also have, the procotol in the conventional art domestic network system does not propose an effective method yet, is used for sending and receiving packets of information.
Summary of the invention
The present invention has successfully solved the problems referred to above.One object of the present invention is exactly data receive method and the transfer approach that is provided at data link layer, be used for domestic network system based on a control protocol, wherein this control protocol is a general communication standard, is used for providing the function that the electronic installation of domestic network system is controlled and monitored.
Another object of the present invention is exactly the data receive method that is provided at data link layer, is used to receive a plurality of the frames relevant with the packets of information that will form.
Another purpose more of the present invention is exactly the data receive method that is provided at data link layer, be used for when a packets of information by a plurality of relevant with this packets of information when received frame is formed, prevent to receive and/or store extra frame.
Another purpose more of the present invention is exactly the data transmission method that is provided at data link layer, is used for more effectively according to network state from the upper strata transport packet.
Another purpose more of the present invention is exactly the data transmission method that is provided at data link layer, is used to prevent the packet conflict by network.
Another purpose more of the present invention is exactly the data receive method that is provided at data link layer, is used for finishing transfer of data according to the retry count between the packets of information transmission period.
Another purpose more of the present invention is exactly the data receive method that is provided at data link layer, is used for according to finishing transfer of data in the transmission time of implementation of packets of information transmission cost.
Another purpose more of the present invention is exactly the data receive method that is provided at data link layer, is used for transmitting and increasing success packet and retransmit probability by variable transmission delay being applied to packets of information.
In order to realize above-mentioned purpose of the present invention, according to an aspect of the present invention, relate to a kind of data receive method that is used for the data link layer of an agreement, wherein this agreement is applied to electronic installation, and be made up of physical layer, data link layer and upper strata, the method comprising the steps of:
Receive data from physical layer;
With the storage that receives in packet buffer;
Determine since last data are received, in predetermined data allow blanking time, whether to have received new data;
In determining step, if in data allow blanking time, received new data, then continue described Data Receiving, storage and deciding step, perhaps,, finish the reception data if in data allow the time interval, do not receive new data;
After the reception data are finished, with the synthetic packets of information of data set that is stored in the packet buffer; And
This packets of information that is combined into is transferred to the upper strata.
According to another aspect of the present invention, relate to a kind of data transferring method that is used for data link layer, wherein this data link layer belongs to an agreement that is applied to electronic installation, this agreement comprises physical layer, data link layer and upper strata at least, and this data link layer transfers to physical layer with packets of information from the upper strata, and the method comprising the steps of:
First checks step, is used to check whether this network state is idle condition;
Check in the step that first if network state is to be in idle condition, then the priority of service SvcPriority according to described packets of information selects a propagation delay time RadomDelayTime in predetermined competition window Wc scope;
Second checks step, is used to check whether this network state is idle condition during selected propagation delay time RadomDelayTime; And
Check in the step second,, the packets of information that receives is transferred to physical layer if network state is to be in idle condition.
According to another aspect of the present invention, relate to a kind of data transferring method that is used for data link layer, wherein this data link layer belongs to the agreement that is applied to electronic installation, this agreement comprises physical layer, data link layer and upper strata at least, and this data link layer transfers to physical layer with packets of information from the upper strata, and wherein this method comprises the steps:
First checks step, is used to check whether this network state is idle condition;
Check in the step first,, the packets of information that receives is sent to physical layer if network state is to be in the free time; And
Carry out first and determine whether successfully transmitted about this packets of information.
According to another aspect of the present invention, relate to a kind of data transferring method that is used for data link layer, wherein this data link layer belongs to the agreement that is applied to electronic installation, this agreement comprises physical layer, data link layer and upper strata at least, and this data link layer transfers to physical layer with packets of information from the upper strata, and the method comprising the steps of:
First checks step, is used to check whether this network state is idle condition;
Check in the step first, if network state is to be in idle condition, select a propagation delay time RadomDelayTime in predetermined competition window Wc scope, wherein this scope is according to the priority of service SvcPriority definition of the packets of information that receives;
Second checks step, is used to check whether this network state is idle condition during selected propagation delay time RadomDelayTime; And
In this second inspection step, when this network state is idle condition during selected propagation delay time RadomDelayTime, the packets of information that receives is transferred to physical layer.
Description of drawings
Fig. 1 is the structure chart of explanation according to domestic network system of the present invention;
Fig. 2 is the structure chart of explanation according to living network control protocol storehouse of the present invention;
Fig. 3 and 4 is respectively the structure chart of the interface between each layer of key diagram 2;
Fig. 5-10 is respectively the detailed structure view of the interface of key diagram 3 and 4;
Figure 11 is for illustrating according to the flow chart that is used for the data receive method of data link layer of the present invention;
Figure 12 has illustrated the frame of being handled by data receive method according to the present invention;
Figure 13 is for illustrating according to the flow chart that is used for the data transmission method of data link layer of the present invention; And
Figure 14 has illustrated the frame of being handled by data transmission method according to the present invention in each electronic installation.
Realize optimal mode of the present invention
Below with reference to accompanying drawings data receive method and the transfer approach that is used for data link layer according to the present invention described in detail.
Fig. 1 is the structure chart of explanation according to domestic network system of the present invention.
Referring to Fig. 1, this domestic network system 1 is by the Internet 2 visit LnCP servers 3, and client terminal device 4 is by internet access LnCP server 3.That is to say that this domestic network system 1 links to each other with LnCP server 3 and/or client terminal device 4 and communicates.
The external network of this domestic network system 1, for example the Internet 2 comprises the additional element according to client terminal device 4 kinds.For example, when client terminal device 4 was computer, this Internet 2 just comprised the Web server (not shown), and when client terminal device 4 was Internet Protocol telephone, this Internet 2 just comprised Wap server (not shown).
This LnCP server 3 conducts interviews to domestic network system 1 and client terminal device 4 according to the predetermined process of landing and withdraw from respectively, receive supervision and control command from client terminal device 4, and the form according to predefined type message of will ordering is transferred to network system 1 by the Internet 2.In addition, this LnCP server 3 receives the message of predefined type from domestic network system 1, and with this message stores and/or transfer to client terminal device 4.A message is also stored or generated to this LnCP server 3, and give domestic network system 1 with this transmission of messages.That is to say that 1 pair of LnCP server 3 of this domestic network system conducts interviews and the content that provides is provided.
This domestic network system 1 comprises home gateway 10, be used to insert the Internet 2, network manager 20-23, be used to be provided with environment and managing electronic device 40-49, LnCP router three 0 and 31 is used for inserting between transmission medium LnCP adapter 35 and 36, be used for network manager 22 and electronic installation are connected to transmission medium, and a plurality of electronic installation 40-49.
The network of this domestic network system 1 forms by utilizing shared transmission medium that electronic installation 40-49 is connected one.Data link layer is used nonstandardized technique transmission medium for example RS-485 or littler output RF, perhaps standardized transmission medium for example power line and IEEE802.11 as transmission medium.
The network of this domestic network system 1 separates with the Internet 2, is used to form an independently network, by wired or wireless transmission medium electronic installation is connected one.Here, this independently network comprise physically and to connect but divided in logic network.
This domestic network system 1 comprises main device, is used to control the operation of other electronic installations 40-49 or monitors its state, and from device, is used in response to the request of main device and notifies their state change message.This main device comprises network manager 20-23, and comprises electronic installation 40-49 from device.This network manager 20-23 comprises information and the control routine of Be Controlled electronic installation 40-49, and controls electronic installation 40-49 according to programmed method or by receiving from the input of LnCP server 3 and/or client terminal device 4.Still referring to Fig. 1, when being connected with a plurality of network manager 20-23, each network manager 20-23 must all be main device and from the device, it promptly physically is a device, but this device (mixing arrangement) is advocated peace simultaneously from function in logic, so that carry out information exchange, data sync and control with other network managers 20-23.
In addition, this network manager 20-23 and electronic installation 40-49 can be directly or by LnCP router three 0 and 31 and/or LnCP adapter 35 and 36 continuous with network (power-line network, RS-485 network and RF network).
This electronic installation 40-49 and/or LnCP router three 0 and 31 and/or LnCP adapter 35 and 36 be registered among the network manager 20-23, and provide internal logic address (for example 0x00,0x00 etc.) by product.This logical address and product code (for example air-conditioning 0x02, washing machine 0x01) are combined in one, and are used as node address.For example, with node address for example 0x0200 (air-conditioning 1) and 0x0201 (air-conditioning 2) to electronic installation 40-49 and/or LnCP router three 0 and 31 and/or LnCP adapter 35 and 36 identify.According to predetermined standard (whole identical products, the installing space of product, user etc.), once a group address be can use, at least one electronic installation 40-49 and/or at least one LnCP router three 0 and 31 and/or at least one LnCP adapter 35 and 36 are used to identify.In this group address, explicit group address is one bunch, be used for specifying multiple arrangement by address option value (mark that will mention below) is set to 1, the implicit expression group address is specified multiple arrangement by whole place values of logical address and/or product code are all added 1.Especially, this implicit expression group address is called as a bunch code.
Fig. 2 is the structure chart of explanation according to living network control protocol storehouse of the present invention.This domestic network system 1 makes network manager 20-23, LnCP router three 0 and 31, LnCP adapter 35 with 36 and electronic installation 40-49 communicate by letter each other according to the living network control protocol (LnCP) of Fig. 2.Therefore, network manager 20-23, LnCP router three 0 and 31, LnCP adapter 35 and 36 and electronic installation 40-49 carry out network service according to this LnCP.
As shown in Figure 2, this LnCP comprises application software 50, be used to carry out network manager 20-23, LnCP router three 0 and 31, LnCP adapter 35 and 36 and the built-in function of electronic installation 40-49, and provide interface function with application layer 60, be used for Long-distance Control and monitor this network, application layer 60, be used for providing service to the user, and provide a function, be used for the form of message from the user form information or order and with this transmission of messages to lower floor, network layer 70, be used for reliably with network manager 20-23, LnCP router three 0 and 31, LnCP adapter 35 and 36 and electronic installation 40-49 network be connected one, data link layer 80, be used to provide to sharing the medium access control function that transmission medium conducts interviews, physical layer 90 is used to provide network manager 20-23, LnCP router three 0 and 31, LnCP adapter 35 and 36 and electronic installation 40-49 between physical interface, and the rule that is transmitted the position, and parameter management layer 100, be used for being provided with and managing the node parameter that uses at every layer.
In more detail, this application software 50 further comprises network management sublayer 51, is used for the management node parameter, and the network manager 20-23 that network is conducted interviews, LnCP router three 0 and 31, LnCP adapter 35 and 36 and electronic installation 40-49.That is to say that these network management sublayer 51 execution parameter management functions are used for being provided with or using the node parameter value by parameter management layer 100, and Network Management Function, be used for when the device that uses LnCP composition or manage this network during for main device.
As network manager 20-23, LnCP router three 0 and 31, LnCP adapter 35 and 36 and the network of electronic installation 40-49 visit be for example power line of a non-independent transmission medium, IEEE 802.11 and wireless (for example, when LnCP comprises PLC agreement and/or wireless protocols) time, this network layer 70 also comprises home code control sublayer 71, is used for being provided with, manages and the processing home code, logically to divide each independent network.When for example RS-485 divided independent network physically by transmission medium independently, this home code control sublayer 71 also was not included among the LnCP.Each home code all is made up of 64 bytes, and is set up random value or designated value as the user.
Fig. 3 and 4 is respectively the structure chart of the interface between each layer of key diagram 2.
Fig. 3 has illustrated the interface between each layer when physical layer 90 links to each other with non-independent transmission medium, and Fig. 4 has illustrated the interface between each layer when physical layer 90 links to each other with independent transmission medium.
This domestic network system 1 adds to protocol Data Unit (PDU) from the upper strata with the header of every layer of needs and telegram end, and they are transferred to lower floor.
Shown in Fig. 3 and 4, application layer PDU (APDU) is exactly the data of transmission between application layer 60 and network layer 70, network layer PDU (NPDU) is exactly the data of transmission between network layer 70 and data link layer 80 or home code control sublayer 71, and home code control sublayer PDU (HCNPDU) is exactly the data of transmission between network layer 70 (saying home code control sublayer 71 accurately) and data link layer 80.Form this interface in the data frame unit between data link layer 80 and physical layer 90.
Fig. 5-10 is respectively the detailed structure view of the interface of key diagram 3 and 4.
Fig. 5 has illustrated the APDU structure in the application layer 60.
APDU length (AL) field shows the length (length from AL to the message field) of APDU, and minimum value is 4, and maximum is 77.
APDU header length (AHL) field shows the length (length from AL to AL0) of APDU header, successfully has 3 bytes and can extend to 7 bytes.In LnCP, this APDU header can be expanded to 7 bytes, is used for message field is encoded and changed application protocol.
Application layer option (ALO) field extension message set.For example, when the ALO field was set to 0, if contain different value in the ALO field, then Message Processing just was left in the basket.
Message field is handled control messages or event information from the user, and is changed according to the numerical value of ALO field.
Fig. 6 has illustrated the NPDU structure in the network layer 70, and Fig. 7 has illustrated the detailed NLC structure of NPDU.
The LnCP packets of information begins (SLP) field and represents the beginning of packets of information, and has numerical value 0x02.
Destination address (DA) and source address (sa) field are respectively the recipient and the sender's of packets of information node address, and all are 16.The highest effective 1 comprises a mark, this mark is represented group address, subsequently 7 comprise a kind of product (product code), and lower 8 comprise logical address, are used to distinguish a plurality of network manager 20-23 of identical type and a plurality of electronic installation 40-49 of identical type.Packet length information (PL) field shows the whole length of the NPDU that will be transmitted, and its initial length is 15 bytes, and maximum length is 120 bytes.
Priority of service (SP) field has provided the transmission priority of message transfer and has had 3.Table 2 shows the priority of each message transfer.
When during in response to the request of main device, obtaining the priority of request message from device from main device from device.
Table 2
| Priority | Numerical value | Type of message |
| High | 0 | -security-related message |
| Middle | 1 | -when general packets of information is transmitted-when the event message that is used to reach the standard grade or down status changes is transmitted |
| Generally | 2 | -when the notification message that is used to form network is transmitted-when general event message is transmitted |
| Low | 3 | -when when downloading or uploading mechanism's transmission data |
NPDU header length (NHL) field extension NPDU header (the NLC field of SLP), successfully have 9 bytes, and can extend to 17 bytes of maximum.
Protocol version (PV) field is represented adopted protocol version, and its length is 1 byte.Higher 4 show version, and lower 4 show child release.Version and child release use HEX to represent their numerical value respectively.
Network layer information bag type (NPT) field is 4 bit fields, is used for distinguishing a kind of packets of information of network layer 70.This LnCP comprises request packet, response message bag, and announcement information bag.The NPT field of main device must be set to request packet or announcement information bag, must be set to response message bag or announcement information bag from the NPT field of installing.Table 3 shows NPT numerical value according to the kind of packets of information.
Table 3
| Explanation | Numerical value |
| Request packet | 0 |
| Keep | 1-3 |
| The |
4 |
| Keep | 5-7 |
| The |
8 |
| Keep | 9-12 |
| Be used for carrying out the reservation numerical value of interface with home code control sublayer | 13-15 |
Transmission counter (TC) field is 2 bit fields, garble has appearred in network layer 70, when making it can't transmit request packet or response message bag exactly,, transmit request packet again or repeatedly transmit the announcement information bag in order to strengthen the transmission success rate of announcement information bag.Table 4 shows the number range of TC field according to NPT numerical value.
Table 4
| The kind of packets of information | Numerical value (scope) |
| Request packet | 1-3 |
| The |
1 |
| The announcement information bag | 1-3 |
Information Bale No. (PN) field is made up of 2 bytes, and itself and use of TC are used for detecting the Copy Info bag from device, and is used to handle a plurality of communication cycles in the main device.Fig. 5 shows the number range of PN field according to NPT numerical value.
Table 5
| The kind of packets of information | Numerical value (scope) |
| Request packet | 0-3 |
| The response message bag | The PN field numerical value of duplicate requests packets of information |
| The kind of packets of information | Numerical value (scope) |
| The announcement information bag | 0-3 |
The APDU field is the protocol Data Unit of the application layer 60 of transmission between application layer 60 and network layer 70.The minimum value of this APDU field is 0 byte, and maximum is 88 bytes.
Cyclic redundancy check (CRC) field is 16 bit fields, is used to check the mistake of the packets of information (from SLP to APDU) that has received.
LnCP end of package (ELP) field is the end of packets of information, and its numerical value is 0x03.If do not detect this ELP field, even the byte length of the data that receive is identical with the numerical value of the length field of packets of information, this packets of information also will be considered to an error message bag.
Fig. 8 has illustrated the HCNPDU structure in the home code control sublayer 71.
As shown in Figure 8, home code (HC) field is added to the top of NPDU.
This home code is made up of 4 bytes, and has unique numerical value in the line length that packets of information can be transmitted.
Fig. 9 has illustrated the frame structure in the data link layer 80.
Change the header and the telegram end structure of the data link layer frame of LnCP according to transmission medium.When data link layer 80 was used the nonstandardized technique transmission mediums, the header and the telegram end of this frame were necessary for null field, and when data link layer 80 use standardization transmission mediums, and the header of this frame and telegram end are according to as the described formation of agreement.When physical layer 90 is that dependent transmission medium is for example during power line IEEE 802.11, the NPDU field is the data cell from top network layer 70 transmission, and the data cell that obtains for the front portion that is added to NPDU by 4 bytes with home code of HCNPDU.This data link layer 80 is handled NPDU and HCNPDU according to identical mode.
Figure 10 has illustrated the frame structure in the physical layer 90.
The function of the physical layer 90 of this LnCP is transmitted exactly and is received physical signalling to transmission medium.This data link layer 80 can use the nonstandardized technique transmission medium for example RS-482 or littler output RF or standardized transmission medium for example power line or IEEE 802.11 as the physical layer 90 of LnCP.Use the domestic network system 1 of LnCP to adopt UART Universal Asynchronous Receiver Transmitter (UART) frame structure and RS-232 signal level, make network manager 20-23 and electronic installation 40-49 can with RS-485, LnCP router three 0 with 31 or LnCP adapter 35 be connected with 36.When UART uses universal serial bus to be connected between the device, the position signal flow on this UART control communication line.In LnCP, be converted into as shown in figure 10 10 UART frame units from the packets of information on upper strata, and transmit by transmission medium.This UART comprises 1 start bit, and 8 data bit, and 1 stop bits are without any check digit.At first transmit this start bit, then transmitted data bits and stop bits.When the domestic network system 1 that uses LnCP had adopted UART, it did not just have extra frame header and frame telegram end.To the node parameter that use in the layer in front be described below.
The data type of node parameter cited below is equivalent to one of a few data type of table 6.
Table 6
| Symbol | Data type | Explanation |
| char | The char that symbol is arranged | When not having specified data length, 1 byte |
| Symbol | Data type | Explanation |
| uchar | The char that does not have symbol | When not having specified data length, 1 byte |
| int | The int that symbol is arranged | When not having specified data length, 2 bytes |
| uint | The int that does not have symbol | When not having specified data length, 2 bytes |
| long | The long that symbol is arranged | When not having specified data length, 4 bytes |
| ulong | The long that does not have symbol | When not having specified data length, 4 bytes |
| string | string | String data, wherein last byte are empty |
| FILE | - | Data with file structure |
Table 7 shows the node parameter value of using in the data link layer 80 of using the UART frame.The transmission rate of supposing physical layer 9 is the time that 4800bps is provided with each parameter.At this, an information unit time is calculated as 2.1ms.
Table 7
| Title | Type | Explanation |
| Frame allows the time interval | Constant uchar FrameTimeOut | When receiving packets of information, the maximum time interval that allows between the UART frame, 2IUT |
| Largest frames allows the time interval | Constant uchar MaxFramelnterval | When receiving packets of information, the maximum time interval that allows between the UART frame, 1IUT |
| The minimal information bag allows the time interval | Uint MinPktlnterval | The minimum interval that allows between two continuous information bags that transmit on the packets of information transmission medium is greater than 5IUT.To transfer to |
| The compensation number of repetition | Constant uchar BackOffRetries | The maximum number of repetitions of the MAC algorithm that causes owing to arbitration failure or data collision, 10 times |
| Title | Type | Explanation |
| Maximum transmitted allows the time | constant uint MACExecTime | The permission time of implementation (ms) of MAC algorithm, 1000ms |
| The busy review time | constant uchar BusyCheckTime | Detect the time of medium state (busy or not busy), 3IUT |
| Propagation delay time | uint RandomDelayTime | When medium was in idle condition, the stand-by time that is used to transmit was by the random value in the competition window Wc scope of SvcPriority numerical value selection |
Figure 11 is for illustrating according to the flow chart that is used for the data receive method of data link layer of the present invention.
Referring to Figure 11, in step S51, before or after the frame from physical layer 90 was transmitted, whether specified data link layer 80 had all set received this frame.If data link layer 80 has generated another packets of information, wherein this packets of information has the frame that has received, perhaps be between the packets of information transmission period (that is S56 that will be described～S58), can determine that then this data link layer 80 is not ready for receiving this frame.Like this, this received frame does not just have processed, and this data receive method here finishes.But, be ready to receive this frame if prove this data link layer 80, then this method proceeds to next step S52.
In step S52, this data link layer 80 receives this frame from physical layer 90, and it is stored in the packet buffer (not shown).In fact, this data link layer 80 sequentially receives a plurality of frames from physical layer 90, so that form a packets of information, and they are stored in the packet buffer.
In step S53, this data link layer 80 will be transmitted at last frame and new frame between interval (being called " frame period " hereinafter for short) allow time interval FrameTimeOut to compare with frame.If this frame period allows time interval FrameTimeOut less than frame, if promptly since having allowed to have received new frame within the time interval FrameTimeOut at frame since the last frame, just mean that then last frame and new frame should be included in the same packets of information.In this case, data link layer 80 receive new frame and with its be stored in the packet buffer step (that is, S52).On the other hand, if frame period allows time interval FrameTimeOut more than or equal to frame, that is to say,, just mean that then last frame and new frame should be included in the packets of information differing from each other if allow not transmit new frame during the time interval FrameTimeOut at frame.Therefore, the frame (comprising last frame) that this data link layer 80 will receive before will putting in advance stores in the packet buffer, and this method proceeds to next step S54.
In step S54, this data link layer 80 thinks that these frames belong to same packets of information, and wherein the frame period of these frames allows time interval FrameTimeOut less than frame, and no longer from physical layer 90 received frames.
Therefore, in step S55, data link layer 80 is forbidden from physical layer 90 received frames.This state keeps the minimal information bag to allow time interval MinPktInterval after finishing reception (required) frame at least, makes that new frame can be not superimposed in packet buffer.
In step S56, the frame that data link layer 80 will be stored in the packet buffer is formed packets of information NPDU.
In step S57, data link layer 80 transfers to top network layer 70 with this packets of information NPDU.
In step S58, data link layer 80 waits for that elapsed time is equal to or greater than the minimal information bag and allows time interval MinPktInterval after finishing this frame of reception.Then, in step S59, this data link layer 80 enables from physical layer 90 received frames.In other words, this frame link layer 80 can receive new frame now and form new packets of information.
Here, the minimal information bag allow time interval MinPktInterval be set to than the deadline of received frame with by network layer 70 packets of information NPDU is transferred to application layer 60 and finishes the bigger numerical value in interval between time of packets of information processing.This just can guarantee that data link layer 80 is not ready for receiving new frame or packets of information, is handled fully up to the frame that receives or its packets of information.In this way, in one deck, receive a plurality of frames or its packets of information, and do not carry out their processing and transmission simultaneously.Therefore, can more stably receive, processing and transmission frame or packets of information.
Above-mentioned data receive method is stored in the predetermined storage device or storage medium with the form of software program.
Figure 12 has illustrated the frame of being handled by data receive method according to the present invention.
Described in Figure 12, packets of information A comprises frame f1-f16.This data link layer 80 is received frame f1 (S52) at first, and this frame f1 has become current received last frame.After received frame f1, in allowing time interval FrameTimeout, frame receives another frame f2 (S53).Repeat this frame receiving course (that is, S52 and S53), up to having received frame f16.As we can see from the figure, the frame period between frame f8 and the f9 still still allows time interval FrameTimeout less than frame greater than other frame period.Like this, frame f8 and f9 just are included among the same packets of information A.
Because in the end the frame after the frame f16 allows not receive in the time interval FrameTimeout new frame ' f1, so 80 of data link layers have been formed packets of information A (S54) with frame f1-f16.
Subsequently, the packets of information A that data link layer 80 transmission is formed, and when this inter packet allowed time interval MinPktInterval every becoming greater than the minimal information bag, ' f1 was to form new packets of information B for the new frame of these data link layer 80 receptions.
Figure 13 for explanation according to the present invention the flow chart at the data transmission method of data link layer.
As mentioned above, this data link layer 80 receives packets of information NPDU/HCNPDU from network layer 70, and forms a frame by increasing frame header and frame telegram end.Then the frame that will form by physical layer 90 transfers to a network (for example the power-line network shown in Fig. 1, RS-485 network, RF network etc.).In the following description, when mentioning frame of data link layer 80 transmission, in fact be exactly that index transmits a frame according to link layer 80, this frame comprises the packets of information from network layer 70.Therefore, specification of the present invention and claims just are based on following hypothesis: this data link layer 80 transfers to physical layer 90 with packets of information from network layer 70.
For from network layer 70 transport packet, retry count RetryCount is set to ' 0 '.
Referring now to Figure 13,, at step S61, data link layer 80 checks whether network state LineStatus is idle condition LINE_IDLE.For this purpose, this data link layer 80 is from the information of physical layer 90 receptions about network state.If this network state LineStatus is idle condition LINE_IDLE, then this method proceeds to next step S62, and if network state LineStatus is busy LINE_BUSY, then this method proceeds to step S71.
In step S62, this data link layer 80 checks whether this network state LineStatus is idle condition LINE_IDLE in the minimal information bag allows time interval MinPktInterval.In order preventing from data collision on network, to occur during by transmitted data on network (packets of information), to be provided with the minimal information bag and to allow time interval MinPktInterval as network manager 20-23 and electronic installation 40-49.Therefore, in order to prevent the identical purpose of data collision, the data link layer 80 that is used for network manager 20-23 and electronic installation 40-49 also checks at step S62 whether this network state LineStatus is idle condition LINE_IDLE in the minimal information bag allows time interval MinPktInterval.If this network state LineStatus becomes busy LINE_BUSY in the minimal information bag allows time interval MinPktInterval, then this method proceeds to step S71, otherwise this method proceeds to step S63.
At step S63, this data link layer 80 is selected propagation delay time RadomDelayTime (the transmission service is represented in above-mentioned service, so this priority of service will be called as ' transmission priority ' in the following description) by the SvcPriority value (referring to table 8) in predetermined competition window Wc scope of the packets of information that receives randomly.Fig. 8 shows competition window Wc scope according to transmission priority.
Table 8
| Transmission priority | Numerical value | Competition window (Wc) scope (IUT) |
| Office | 0 | 0-5 |
| |
1 | 10-20 |
| Generally | 2 | 10-30 |
| |
3 | 30-60 |
As shown in table 8, priority value is high more, and promptly priority is low more, and competition window Wc scope will be wide more, and its lower limit also can increase.For example, under the situation of high priority, Wc scope following be limited to 0 and its on be limited to 5.Similarly, under the situation of normal priority, Wc scope following be limited to 10 and its on be limited to 30.Because propagation delay time RadomDelayTime selects in competition window Wc scope at random, therefore the probability of the less propagation delay time RadomDelayTime of selection relatively will be higher in less priority value.
In step S64, this data link layer 80 checks whether this network state LineStatus is idle condition LINE_IDLE in selecteed propagation delay time RadomDelayTime.Especially, in order to prevent the packet conflict on the network, carried out step S64.If this network state LineStatus is busy LINE_BUSY, then this method proceeds to step S68.But if this network state LineStatus is idle condition LINE_IDLE in propagation delay time RadomDelayTime, then this method proceeds to step S65.
In step S65, this data link layer 80 determines whether this packets of information is successfully transmitted.In order to draw this conclusion, this data link layer 80 will compare from the packets of information of physical layer 90 and the packets of information of network layer 70.If these two packets of information are identical, then this data link layer 80 determines that this packets of information transmission is successfully carried out, and like this, this method proceeds to step S67.But if packets of information is inequality, then this method proceeds to step S68.
In step S67, the result that data link layer 80 will be transmitted reports to network layer 70, and wherein this transmission result comprises success message SEND_OK.
In step S68, if if the network state LineStatus among the step S64 is busy LINE_BUSY or does not have successfully transport packet that in step S66 the retry count RetryCount that then is used for received packets of information increases predetermined value.For example, though when beginning retry count RetryCount is set to " 0 ", this retry count RetryCount is increased to ' 1 '.
In step S69, the retry count RetryCount of increase and predetermined backoff number of repetition BackOffRetries compare.This compensation number of repetition BackOffRetries is meant that from data link layer 80 to physical layer 90 transmit the maximum of the retry count of identical information bag again.Also have, in step S69, retry count RetryCount for the identical information bag is restricted to compensation number of repetition BackOffRetries, only just uses their resource for the transmission of identical information bag so that prevent network manager 20-23 and electronic installation 40-49.If this retry count RetryCount is more than or equal to compensation number of repetition BackOffRetries, then this method proceeds to step S70, otherwise this method proceeds to step S71.
In step S70, this data link layer 80 reports to network layer 70 with the result of packets of information transmission, and wherein this result comprises failed message SEND_FAILED.
In step S71, this data link layer 80 allows time MACExecTime to compare the transmission time of implementation and the predetermined maximum transmitted of the packets of information that receives.This transmission time of implementation is meant till this comparison, the total amount of packets of information transmission institute spended time.By being restricted to any value below the maximum transmitted permission time MACExecTime packets of information transmission time, just can prevent that network manager 20-23 and electronic installation 40-49 from only just using their resource for identical packets of information.If the transmission time of implementation of the packets of information that receives allows time MACExecTime greater than maximum transmitted, then data link layer 80 reports to network layer 70 (S70) with bust this message SEND_FAILED.But if the transmission time of implementation of the packets of information that receives allows time MACExecTime less than maximum transmitted, then this method proceeds to step S72.
In step S72, according to the transmission priority SvcPriority of the packets of information that receives competition window Wc scope is changed predetermined migration, and then this method proceeds to step S61.
In fact, changing this Wc scope is exactly in order to improve the possibility of packets of information transmission.Table 9A shows by the reduction value WindowShift according to transmission priority and dwindles competition window Wc scope.
Table 9A
| Transmission priority | Numerical value | Competition window (Wc) scope (IUT) | Reduction value (WindowShift) (IUT) |
| High | 0 | 0-5 | 0 |
| |
1 | 10-20 | 1 |
| Generally | 2 | 10-30 | 1 |
| |
3 | 30-60 | 3 |
Suppose that competition window Wc scope is reduced as shown in table 9A.Under the situation of intermediate conveyor priority SvcPriority, the Wc scope 10-20 that is used for first transmission is contracted to the scope 9-19 that is used for second transmission, and its upper and lower bound all is lowered.Even this just means that the numerical value also littler than the propagation delay time RadomDelayTime that selects is also more likely selected in step S63.Therefore, can check network state LineStatus again in the shorter time, it has increased packets of information transmission possibility successively.
In step S72, also can only reduce above-mentioned reduction value Window Shift to one of lower limit and upper limit.For example, this data link layer 80 is according to retry count RetryCount fixed upper limit, and the reduction value WindowShift that only lower limit is reduced to be scheduled to.
In step S72, guarantee that it is very important that lower limit does not drop to below the predetermined deviant.In this case, the lower limit of each transmission priority SvcPriority can keep at least one predetermined space.Therefore, even during transmitting (or retry) packets of information again, also will transmit possibility and remain different value according to transmission priority SvcPriority.
In addition, in step S72, in order to reduce packet conflict (possibility) by network, according to transmission priority, competition window Wc scope has been increased the reduction value WindowShift shown in Fig. 9 B.
Table 9B
| Transmission priority | Numerical value | Competition window (Wc) scope (IUT) | Added value (WindowShift) (IUT) |
| High | 0 | 0-5 | 0 |
| |
1 | 10-20 | 20 |
| Generally | 2 | 10-30 | 30 |
| |
3 | 30-60 | 60 |
Supposing increases competition window Wc scope shown in table 9B.Under the situation of intermediate conveyor priority SvcPriority, the Wc scope 10-20 that is used for first transmission is increased to the scope 30-40 that is used for second transmission, and its upper and lower bound all increases by 20.Even this just means that the numerical value also bigger than the propagation delay time RadomDelayTime that selects is also more likely selected in step S63.Therefore, can check network state LineStatus (Line_Status) again in long-time at one, it reduces the packet conflict by network successively.
In step S72, also can only increase above-mentioned added value Window Shift to one of lower limit and upper limit.For example, this data link layer 80 is according to the fixing lower limit of retry count RetryCount, and only the upper limit increased predetermined added value WindowShift.
According to data transmission method of the present invention, step S63, S64 and S72, step S68-S69 is in perhaps step S71 can both optionally be included in.That is to say that data transmission method can be made up of the Overall Steps shown in Figure 13, perhaps also can only form by a part of step in them.
Figure 14 has illustrated the frame of being handled by data transmission method according to the present invention in each electronic installation.
Especially, Figure 14 has illustrated 4 electronic installation 40-43, and these 4 electronic installations transmit simultaneously by network or prepare the predetermined packets of information of transmission.For example, electronic installation 40 has been in during the transport packet, and other electronic installation 41-43 just is ready to transport packet.
Among the electronic installation 41-43 each is all carried out step S61 (please referring to Figure 13), in order to check network state LineState.Then, since the minimal information bag of electronic installation after 40 transmission deadlines allows time interval MinPktInterval, this electronic installation 41-43 carries out step S62 and S63, selects propagation delay time RadomDelayTime with the packets of information transmission priority SvcPriority that receives according to them.
Later see Figure 14 again, as time goes by, the result is that electronic installation 42 has the shortest propagation delay time RadomDelayTime.Therefore, electronic installation 42 transmission these packets of information (please referring to step S64 among Figure 13 and S65), and other electronic installations 41-43 checks network state during their propagation delay time RadomDelayTime, and proceed to the method after the step S68.After electronic installation 42 had transmitted predetermined packets of information, electronic installation 41 and 43 carried out aforesaid same steps as.
As up to the present illustrated, the invention provides the transfer of data and the method for reseptance of data link layer, and be used for domestic network system according to control protocol, wherein this control protocol is the common communications standard, is used for the electronic installation of domestic network system is controlled and monitored.
According to the present invention, receive only a plurality of frames relevant with the packets of information that will form.
In addition, the present invention can be advantageously used in preventing that extra frame is received and/or stores when a packets of information is made up of a plurality of frames relevant with this packets of information that receive.
According to the present invention, can more effectively be transmitted from the packets of information on upper strata, this depends on the state of network.
Also have, the present invention can be advantageously used in preventing the packet conflict by network.
According to the present invention, finish the packets of information transmission according to the retry count between the packets of information transmission period.Therefore, can prevent that network equipment from using their whole resources only to be used for the packets of information transmission.
And,, finish packets of information according to the transmission time of implementation of cost in the packets of information transmission and transmit according to the present invention.Therefore can prevent that network equipment from using their whole resources only to be used for the packets of information transmission.
Further, the present invention can be used to easily by the variable transmission delay of packets of information transmission employing being increased the possibility of success packet transmission, and it transmits according to the transmission priority that carries out at random successively.
Though the preferred embodiments of the present invention are described, but be understandable that, the present invention should be not limited only to these preferred embodiments, and in the desired in the back the spirit and scope of the present invention, those skilled in the art can carry out various changes and modification.
Claims (24)
1. data receive method that is used for the data link layer of an agreement, wherein this agreement is applied to electronic installation, and is made up of physical layer, data link layer and upper strata, and the method comprising the steps of:
Receive data from physical layer;
With the storage that receives in packet buffer;
Determine since last data are received, in predetermined data allow blanking time, whether to have received new data;
In determining step, if in data allow blanking time, received new data, then continue described Data Receiving, storage and deciding step, perhaps,, finish the reception data if in data allow the time interval, do not receive new data;
After the reception data are finished, with the synthetic packets of information of data set that is stored in the packet buffer; And
This packets of information that is combined into is transferred to the upper strata.
2. according to the method for claim 1, further comprise step:
Determined before the Data Receiving step whether this data link layer is ready to receive data, and if this data link layer all set, then receive these data.
3. according to any one method in claim 1 or 2, further comprise step:
After finishing the reception data and before forming packets of information, the Data Receiving of disable data link layer.
4. according to the method for claim 3, further comprise step:
After the scheduled time gap of packets of information transmission, the Data Receiving of enable data link layer.
5. according to the method for claim 4, wherein this preset time allows time interval MinPktInterval for the minimal information bag.
6. according to the method for claim 5, wherein this minimal information bag allows time interval MinPkt Interval greater than receiving packets of information and finishing the time that spends on the upper strata when packets of information is handled.
7. data transferring method that is used for data link layer, wherein this data link layer belongs to an agreement that is applied to electronic installation, this agreement comprises physical layer, data link layer and upper strata at least, and this data link layer transfers to physical layer with packets of information from the upper strata, and the method comprising the steps of:
First checks step, is used to check whether this network state is idle condition;
Check in the step that first if network state is to be in idle condition, then the priority of service SvcPriority according to described packets of information selects a propagation delay time RadomDelayTime in predetermined competition window Wc scope;
Second checks step, is used to check whether this network state is idle condition during selected propagation delay time RadomDelayTime; And
Check in the step second,, the packets of information that receives is transferred to physical layer if network state is to be in idle condition.
8. according to the method for claim 7, wherein during allowing time interval MinPktInterval, the minimal information bag carries out this first inspection step.
9. according to the method for claim 7, further comprise step:
Carry out first and determine whether successfully transmitted about this packets of information.
10. according to the method for claim 9, further comprise step:
If in first determining step, this packets of information is not successfully transmitted, the retry count RetryCount that then will receive packets of information increases predetermined value;
Between retry count RetryCount that increases and predetermined backoff number of repetition BackOffRetries, carry out first relatively; And
In this first comparison,
If the retry count RetryCount that increases is greater than predetermined backoff number of repetition BackOffRetries, the transmission result transmission that then will comprise failed message SEND_FAILED is to the upper strata.
11. according to the method for claim 10, if wherein, in first comparison step, the retry count RetryCount of increase is less than or equal to predetermined backoff number of repetition BackOffRetries, then carries out all steps since the first inspection step once more.
12., further comprise step according to the method for one of claim 9-11:
Allow to carry out between the time MACExecTime second relatively in transmission time of implementation that receives packets of information and predetermined maximum transmitted,
If wherein, check in the steps first and second, if this network state for busy or, in first comparison step, the retry count RetryCount of this increase is less than or equal to compensation number of repetition BackOffRetries, then carries out second comparison step.
13., further comprise step according to the method for claim 12:
According to second result who compares, will transmit result transmission to the upper strata,
If wherein, in second comparison step, the transmission time of implementation that has received packets of information allows time MACExecTime more than or equal to maximum transmitted, then comprises failed message SEND_FAILED among this transmission result.
14. according to the method for claim 13, if wherein, in second comparison step, the transmission time of implementation that has received packets of information allows time MACExecTime less than predetermined maximum transmitted, then carries out all steps since the first inspection step once more.
15. according to the method for claim 9, wherein this first determining step comprises substep:
Will be transport packet with receive packets of information and compare, and determine according to comparative result whether this packets of information is successfully transmitted.
16. data transferring method that is used for data link layer, wherein this data link layer belongs to the agreement that is applied to electronic installation, this agreement comprises physical layer, data link layer and upper strata at least, and this data link layer transfers to physical layer with packets of information from the upper strata, and wherein this method comprises the steps:
First checks step, is used to check whether this network state is idle condition;
Check in the step first,, the packets of information that receives is sent to physical layer if network state is to be in the free time; And
Carry out first and determine whether successfully transmitted about this packets of information.
17., further comprise step according to the method for claim 16:
If in first determining step, this packets of information is not successfully transmitted, the retry count RetryCount that then will receive packets of information increases predetermined value;
Between retry count RetryCount that increases and predetermined backoff number of repetition BackOffRetries, carry out first relatively; And
In first compares, if the retry count RetryCount that increases, will transmit result's report greater than predetermined backoff number of repetition BackOffRetries to the upper strata.
18., further comprise step according to the method for one of claim 16 or 17:
Allow to carry out between the time MACExecTime second relatively in transmission time of implementation that receives packets of information and predetermined maximum transmitted,
If wherein, check in the step first, if this network state for busy or, in first comparison step, the retry count RetryCount of this increase is less than or equal to compensation number of repetition BackOffRetries, then carries out second comparison step.
19. data transferring method that is used for data link layer, wherein this data link layer belongs to the agreement that is applied to electronic installation, this agreement comprises physical layer, data link layer and upper strata at least, and this data link layer transfers to physical layer with packets of information from the upper strata, and the method comprising the steps of:
First checks step, is used to check whether this network state is idle condition;
Check in the step first, if network state is to be in idle condition, select a propagation delay time RadomDelayTime in predetermined competition window Wc scope, wherein this scope is according to the priority of service SvcPriority definition of the packets of information that receives;
Second checks step, is used to check whether this network state is idle condition during selected propagation delay time RadomDelayTime; And
In this second inspection step, when this network state is idle condition during selected propagation delay time RadomDelayTime, the packets of information that receives is transferred to physical layer.
20., further comprise step according to the method for claim 19:
Determine whether this packets of information is successfully transmitted.
21., further comprise step according to the method for claim 20:
Allow to compare between the time MACExecTime in transmission time of implementation that receives packets of information and predetermined maximum transmitted,
If wherein, check in the steps first and second, if this network state for busy or, in first determining step, this packets of information is not successfully transmitted, and then compares step.
22., further comprise step according to the method for claim 21:
In described comparison step, allow time MACExecTime if received the transmission time of implementation of packets of information less than maximum transmitted, competition window Wc scope is changed pre-sizing, wherein this pre-sizing is to be set up according to the priority of service SvcPriority that receives packets of information, and carries out first once more and check step.
23., wherein,, reduce the lower limit of competition window Wc scope and/or the size of the upper limit in order to increase the transmission possibility according to the method for claim 22.
24., wherein,, increase the lower limit of competition window Wc scope and/or the size of the upper limit in order to dwindle transmission collision according to the method for claim 22.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20040022188A KR100615806B1 (en) | 2003-05-30 | 2004-03-31 | Data receiving method for data link layer |
| KR10-2004-0022188 | 2004-03-31 | ||
| KR20040022189A KR100588720B1 (en) | 2003-05-30 | 2004-03-31 | Packet transferring method for data link layer |
| KR1020040022189 | 2004-03-31 | ||
| KR10-2004-0022189 | 2004-03-31 | ||
| KR1020040022188 | 2004-03-31 | ||
| PCT/KR2005/000944 WO2005094190A2 (en) | 2004-03-31 | 2005-03-31 | Data receiving method and transferring method for data link layer |
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| Publication Number | Publication Date |
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| CN1939008A CN1939008A (en) | 2007-03-28 |
| CN1939008B true CN1939008B (en) | 2010-06-16 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1317218A (en) * | 1998-08-12 | 2001-10-10 | 诺基亚网络有限公司 | Method and equipment for setting timer |
| CN1379557A (en) * | 2002-05-16 | 2002-11-13 | 武汉汉网高技术有限公司 | ARQ mechanism able to automatically request retransmissions for multiple rejections |
| US6519223B1 (en) * | 1999-04-06 | 2003-02-11 | Telefonaktiebolaget L M Ericsson (Publ) | System and method for implementing a semi reliable retransmission protocol |
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2005
- 2005-03-31 CN CN2005800103134A patent/CN1939008B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1317218A (en) * | 1998-08-12 | 2001-10-10 | 诺基亚网络有限公司 | Method and equipment for setting timer |
| US6519223B1 (en) * | 1999-04-06 | 2003-02-11 | Telefonaktiebolaget L M Ericsson (Publ) | System and method for implementing a semi reliable retransmission protocol |
| CN1379557A (en) * | 2002-05-16 | 2002-11-13 | 武汉汉网高技术有限公司 | ARQ mechanism able to automatically request retransmissions for multiple rejections |
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| CN1939008A (en) | 2007-03-28 |
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