CN101577673B - Flow control processing method - Google Patents
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- CN101577673B CN101577673B CN2008101062508A CN200810106250A CN101577673B CN 101577673 B CN101577673 B CN 101577673B CN 2008101062508 A CN2008101062508 A CN 2008101062508A CN 200810106250 A CN200810106250 A CN 200810106250A CN 101577673 B CN101577673 B CN 101577673B
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Abstract
The invention discloses a flow control processing method, which comprises the following steps that: a local radio link protocol (RLP), after a periodic relative timer is due, calls a function interface of a local layer two relay (L2R) to analyze a protocol data unit (PDU) sent by a remote end to obtain an analysis result; the local L2R judges whether the occupied space of a local receiving shared buffer area exceeds a preset threshold, and performs the flow control and removes the flow control if the occupied space of the local receiving shared buffer area exceeds the preset threshold; otherwise, the local L2R judges whether a flow control signal from the remote end is received after writing data into the local receiving shared buffer area according to the analysis result, and performs theflow control and removes the flow control if the flow control signal from the remote end is received; otherwise, whether the occupied space of the local receiving shared buffer area exceeds the prese t threshold is judged, and the steps of sending the flow control signal and removing the flow control are executed if the occupied space of the local receiving shared buffer exceeds the preset threshold; and otherwise, the data is sent to the remote end. The utilization of the method can improve the flow control performance and reduce the resource consumption of the system.
Description
Technical field
The present invention relates to the Flow Control treatment technology, refer in particular to a kind of flow control processing method.
Background technology
The data service of circuit domain is divided into transparent data service and non-transparent data traffic, and transparent data service has fixing message transmission rate, fixing propagation delay time and variable data error rate; And the data transmission rate of non-transparent data traffic is variable, and the error control mechanism of enhancing is arranged, and propagation delay time is variable.
In end side; The data service of circuit domain is mainly by terminal adapting function (TAF; Terminal AdaptorFunction) module is accomplished, and accomplishes public land mobile communication network (PLMN, the Public LandMobile-communication Network) network user, public switch telephone network (PSTN; PublicSwitched Telephone Network) network user and integrated services digital network (ISDN; IntegratedServices Digital Network) terminal adapting function that carries out data service between the network user wherein, mainly is the function that realizes terminal protocol conversion and rate adapted.
In the non-transparent data traffic of circuit domain, the function of TAF module is mainly accomplished by radio link protocol (RLP, Radio Link Protocol) and this two sub-module of layer two relaying (L2R, Layer 2 Relay).The RLP module plays the data link layer protocol effect, through frame check, sliding window technique, supports to retransmit and select re-transmission, guarantees the reliable transmission and the Flow Control of data.The L2R module mainly is responsible for protocol conversion and the Flow Control to the circuit agreement, in upstream data is handled, from sending the sharing buffer reading of data, accomplishes the framing of user data and filling in of state information, passes to RLP and sends to network; In downlink data was handled, L2R received data from RLP, extracted state information, and is mutual with terminal (TE, Terminal Element), and writes data to receiving sharing buffer.Specifically, during L2R resume module control signal,, receive control signal from TE and user data, insert mode bits such as corresponding SA, SB, X for up; For descending, from the user data of receiving, extract mode bits such as SA, SB, X and send to TE.These mode bits are used for describing the state of TE and carry out Flow Control and handle, protocol description the conversion from circuit signal to these mode bits.During L2R resume module data, segmentation and reconfigure user data, the protocol Data Unit (PDU, Protocol Data Unit) that user data is fitted to suitable R LP carries out the transmission of Radio Link.
In the prior art, in the non-transparent data traffic of terminating circuit territory, the submodule of TAF; Be that L2R module and RLP module reside in the system as independent process respectively; The two cooperatively interacts, and realizes the function of non-transparent data traffic in an orderly manner, but owing to the two resides in the system as independent process respectively; No matter when all to take resource, therefore very big to the resource consumption of system; And, carrying out Flow Control when handling, only consider far-end peer layer L2R module and local terminal L2R module and local terminal TE flow control signal alternately, so the performance of Flow Control is lower.It is thus clear that it is high to seek a kind of Flow Control performance, and the flow control processing method that can reduce system resources consumption will seem very crucial.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of flow control processing method, can improve the Flow Control performance, and reduces system resources consumption.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of flow control processing method is applicable to that the transfer of data of local terminal and far-end, local terminal and far-end all comprise radio link protocol RLP entity, layer two relaying L2R and terminal TE at least, and this method comprises: be the corresponding periodicity relative timer of each business setting; This method is further comprising the steps of: A, local terminal RLP entity the periodicity relative timer then after; Call the function interface of local terminal L2R; Local terminal L2R confirm local terminal the reception sharing buffer take up room surpass preset threshold value after; Local terminal TE sends flow control signal to local terminal L2R, and local terminal L2R stops to write data to the reception sharing buffer of local terminal; B, local terminal L2R send flow control signal through network to far-end L2R, and far-end L2R stops the transmission sharing buffer reading of data from far-end.
Further; After the step B; This method further comprises: local terminal L2R confirm local terminal the reception sharing buffer take up room be reduced to below the preset threshold value after, local terminal TE sends to local terminal L2R and removes flow control signal, local terminal L2R recovers to write data to the reception sharing buffer of local terminal; And pass through network and send the releasing flow control signal to far-end L2R, far-end L2R recovers the transmission sharing buffer reading of data from far-end.
Further; In the steps A, after the function interface of local terminal RLP entity invokes local terminal L2R, local terminal L2R confirms to take up room above before the predetermined threshold value; This method further comprises: the protocol Data Unit PDU that local terminal L2R sends far-end resolves, and obtains analysis result.
Preferably; Said obtaining after the analysis result; This method further comprises: local terminal L2R judges whether the taking up room of reception sharing buffer of local terminal surpasses preset threshold value; If do not have to surpass preset threshold value, local terminal L2R writes data according to analysis result to the reception sharing buffer of local terminal.
Preferably; Local terminal L2R according to analysis result after the reception sharing buffer of local terminal writes data; This method further comprises: local terminal L2R judges whether local terminal receives the flow control signal that far-end L2R sends, if receive that then local terminal L2R stops the transmission sharing buffer reading of data from local terminal; Otherwise local terminal L2R judges whether the taking up room of transmission sharing buffer of local terminal surpasses preset threshold value.
Further, local terminal L2R stops the transmission sharing buffer reading of data from local terminal, and after confirming to receive the releasing flow control signal that far-end L2R sends, this method further comprises: recover the transmission sharing buffer reading of data from local terminal.Preferably, this method further comprises: taking up room of the transmission sharing buffer of local terminal surpasses preset threshold value, and then local terminal L2R sends flow control signal to local terminal TE, and local terminal TE stops to write data to the transmission sharing buffer of local terminal; Otherwise local terminal L2R is from the transmission sharing buffer reading of data of local terminal, according to the framing that requires of the PDU of L2R, the data that read is placed on the transmit queue of local terminal RLP entity, sends data to far-end.
Further; Local terminal TE stops after the transmission sharing buffer of local terminal writes data; This method further comprises: local terminal L2R confirm local terminal the transmission sharing buffer take up room be reduced to below the preset threshold value after, local terminal L2R sends to local terminal TE and removes flow control signal, local terminal TE recovers to write data to the transmission sharing buffer of local terminal; Local terminal L2R is from the transmission sharing buffer reading of data of local terminal; According to the framing that requires of the PDU of L2R, the data that read are placed on the transmit queue of local terminal RLP entity, send data to far-end.
A kind of flow control processing method is applicable to that the transfer of data of local terminal and far-end, local terminal and far-end all comprise radio link protocol RLP entity, layer two relaying L2R and terminal TE at least, and this method comprises: be the corresponding periodicity relative timer of each business setting; This method is further comprising the steps of: local terminal RLP entity the periodicity relative timer then after; Call the function interface of local terminal L2R; The taking up room of transmission sharing buffer of confirming local terminal surpasses after the preset threshold value; Local terminal L2R sends flow control signal to local terminal TE, and local terminal TE stops to write data to the transmission sharing buffer of local terminal.
Further; Call after the function interface of local terminal L2R, this method further comprises: local terminal L2R judges whether the taking up room of transmission sharing buffer of local terminal surpasses preset threshold value, if there is not to surpass preset threshold value; Local terminal L2R is from the transmission sharing buffer reading of data of local terminal; According to the framing that requires of the PDU of L2R, the data that read are placed on the transmit queue of local terminal RLP entity, send data to far-end.
Preferably; Local terminal TE stops after the transmission sharing buffer of local terminal writes data; This method further comprises: local terminal L2R confirm local terminal the transmission sharing buffer take up room be reduced to below the preset threshold value after, local terminal L2R sends to local terminal TE and removes flow control signal, local terminal TE recovers to write data to the transmission sharing buffer of local terminal; Local terminal L2R is from the transmission sharing buffer reading of data of local terminal; According to the framing that requires of the PDU of L2R, the data that read are placed on the transmit queue of local terminal RLP entity, send data to far-end.
Further; The taking up room of transmission sharing buffer of confirming local terminal surpasses before the preset threshold value; This method further comprises: after local terminal L2R confirms to receive the flow control signal that far-end L2R sends; Local terminal L2R stops the transmission sharing buffer reading of data from local terminal, after local terminal L2R receives the releasing flow control signal that far-end sends, recovers the transmission sharing buffer reading of data from local terminal.
Compared with prior art, the present invention has following characteristics and advantage:
1) the present invention is provided with threshold value for sending sharing buffer respectively with the reception sharing buffer; And after taking up room of the reception sharing buffer of confirming local terminal surpasses preset threshold value; Or after definite local terminal receives the flow control signal that far-end sends; Or definite local terminal sends taking up room above after the preset threshold value of sharing buffer; Can be reduced to below the predetermined threshold value up to sending sharing buffer or receiving taking up room of sharing buffer, again through removing the flow control signal resume data transmission through the flow control signal control data transmission.So, not only transmission sharing buffer, the taking up room of sharing buffer of reception of local terminal are judged; And, increased control signal to data transfer throughput, promptly increase flow control signal and removed the mutual of flow control signal, improved the performance of Flow Control, reduced the possibility of packet loss;
2) compared with prior art, the present invention as function interface, only just starts L2R in Data Receiving when sending with the entity process of L2R, no longer needs L2R to reside in the process always, has reduced the resource consumption at terminal;
3) though propose in the agreement that end-to-end Flow Control is arranged, back-pressure technology, Receive Not Ready (RNR; ReceiveNot Ready) three kinds of fluidicses, but do not adopt these three kinds of fluidicses in the prior art simultaneously, only adopt wherein one or both; And in the present invention; These three kinds of fluidicses are used in combination, and strictness follows agreement, the strictness of agreement is followed has increased versatility of the present invention and practicality.
Description of drawings
The sketch map that Fig. 1 handles for Flow Control of the present invention;
The method flow sketch map that Fig. 2 handles for Flow Control of the present invention;
Fig. 2 A is the Flow Control handling process sketch map of A part among Fig. 2;
Fig. 3 handles sketch map for the Flow Control that the present invention receives data;
Fig. 4 receives the flow control processing method schematic flow sheet of data for the present invention;
Fig. 5 handles sketch map for the Flow Control that the present invention sends data;
Fig. 6 sends the flow control processing method schematic flow sheet of data for the present invention.
Embodiment
Basic thought of the present invention is: with the end-to-end fluidics in the agreement, back-pressure technology, RNR is technological combines; With the entity process of L2R as function interface; Only when the state of RLP entity gets into the transfer of data attitude; Just call the function interface of L2R and handle the reception sharing buffer of L2R and TE or send sharing buffer, need not let L2R reside in for a long time in the process, therefore reduced the consumption of terminal system resource as prior art as module; Considering the processing of peer layer RLP flow control signal; When reaching the flow control signal back-pressure technology use of local terminal RLP module and L2R module; Increased the control signal of local terminal L2R and TE; Promptly increase the interaction process of flow control signal and releasing flow control signal, improved the reliability of non-transparent data traffic transmission.
Wherein, so-called Flow Control end to end is the Flow Control of TE to TE, and local terminal L2R receives the flow control signal that local terminal TE sends, and preferentially sends to the L2R module of far-end peer layer, stops simultaneously sending data to local terminal TE;
So-called back-pressure technology is meant: when the L2R of local terminal and the transmission sharing buffer of TE surpass threshold value, L2R stops to send data through the signalisation local terminal TE that leaves a blank to the local terminal transmission;
The technology of so-called RNR is meant: RLP receives the RNR condition of far-end peer layer RLP, and local terminal L2R sends flow control signal to local terminal TE.
To combine accompanying drawing that further detailed explanation is done in practical implementation of the present invention below.
In following explanation, for the convenience of explaining, all transmission sharing buffers refer to the transmission sharing buffer of L2R and TE, and all reception sharing buffers refer to the reception sharing buffer of L2R and TE.All local terminal and far-ends are in peer layer.
Method flow that Flow Control of the present invention is handled and sketch map are shown in Fig. 1, Fig. 2, Fig. 2 A, and the direction of arrow that dotted line indicates among Fig. 1 is represented the direction that data transmit, and the direction of arrow that solid line indicates is represented flow control signal or removed the sending direction of flow control signal.The present invention includes following steps:
Step 201, local terminal RLP periodically relative timer then after, call the function interface of local terminal L2R, the PDU that far-end is sent resolves, and obtains analysis result;
Generally; At local terminal and far-end all can be the corresponding periodicity relative timer of each business setting in advance; Every end periodically the duration of relative timer to be local terminal with far-end hold consultation according to service conditions and the speed of eating dishes without rice or wine separately confirms that local terminal generally is identical with the duration of far-end periodicity relative timer jointly.Local terminal and far-end periodicity relative timer separately starts when business begins separately; The startup of local terminal periodicity relative timer and the far-end periodically startup of relative timer have certain time difference; Need the regular hour because the data that local terminal sends are sent to far-end, it generally is exactly to start the local terminal periodically relative timer and the time difference that starts far-end periodicity relative timer that data are sent to the required time of far-end by local terminal.
Step 202, local terminal L2R judge that local terminal receives taking up room of sharing buffer and whether surpasses preset threshold value, if surpass, then carry out Flow Control and remove Flow Control, promptly execution in step 203 '～step 207 '; Otherwise execution in step 203;
Step 203 ', local terminal TE sends flow control signal to local terminal L2R, local terminal L2R stops to receive sharing buffer to local terminal and writes data, and sends flow control signal to network;
Here reach in the following explanation, flow control signal is meant that the recipient who notifies this signal stops from sending the sharing buffer reading of data or stopping to receiving the signal that sharing buffer writes data.
Step 204 ', network sends flow control signal to far-end L2R, far-end L2R stops the transmission sharing buffer reading of data from far-end, promptly far-end L2R stops to send data to local terminal;
Step 205 ', local terminal L2R judges that local terminal receives taking up room of sharing buffer and whether is reduced to below the preset threshold value, if, then execution in step 206 '; Otherwise continue to wait for, receive sharing buffer up to local terminal and be reduced to below the predetermined threshold value;
Here, receive predetermined threshold value that sharing buffer takes up room generally rule of thumb value be provided with, can be set to receive that sharing buffer takes up room is half the or 3/4ths, or be made as other value, generally begin to set before in business.
Step 206 ', local terminal TE send to remove flow control signal to local terminal L2R, local terminal L2R recovers to receive sharing buffer to local terminal and writes data, and sends to network and to remove flow control signal;
Step 207 ', network send to remove flow control signal to far-end L2R, far-end L2R recovers to send the sharing buffer reading of data to far-end, promptly recovers to send data to local terminal, execution in step 201 then;
Here, it is identical to receive the general preset value that takes up room with the transmission sharing buffer of predetermined threshold value that sharing buffer takes up room; And, also be before business begins, to set.
Step 208 " ', local terminal L2R send to remove flow control signal to local terminal TE, local terminal TE recovers to send sharing buffer to local terminal and writes data, execution in step 206 then.
The present invention receives the flow control processing method flow process of data like Fig. 3, shown in 4, and in like manner, the direction of arrow that dotted line indicates among Fig. 3 is represented the direction that data transmit, and the direction of arrow that solid line indicates is represented flow control signal or removed the sending direction of flow control signal.The present invention includes following steps:
Step 401, local terminal receive the PDU that far-end is sent, the periodicity relative timer of local terminal then after, the RLP of local terminal calls the function interface of local terminal L2R, and the PDU that is received is resolved, and obtains analysis result;
Here, periodically relative timer is identical with periodicity relative timer in the step 201.
Step 402, local terminal L2R judge that local terminal receives taking up room of sharing buffer and whether surpasses predetermined threshold value, if surpass, then execution in step 403 '～step 407 '; Otherwise execution in step 403;
Step 403 ', local terminal TE sends flow control signal to local terminal L2R, local terminal L2R stops to receive sharing buffer to local terminal and writes data, and sends flow control signal to network;
Step 404 ', network sends flow control signal to far-end L2R, far-end L2R stops to send the sharing buffer reading of data to far-end, promptly stops to send data to local terminal;
Step 405 ', local terminal L2R judges that local terminal receives taking up room of sharing buffer and whether is reduced to below the predetermined threshold value, if, then execution in step 406 '; Otherwise continue to wait for, receive taking up room of sharing buffer up to local terminal and be reduced to below the predetermined threshold value;
Step 406 ', local terminal TE send to remove flow control signal to local terminal L2R, local terminal L2R recovers to receive sharing buffer to local terminal and writes data, and sends to network and to remove flow control signal;
Step 407 ', network send to remove flow control signal to far-end L2R, far-end L2R recovers to send the sharing buffer reading of data to far-end, promptly far-end L2R recovers to send data to local terminal, execution in step 401 then;
Step 403, local terminal L2R receive sharing buffer according to analysis result to local terminal and write data, and execution in step 401 then.
The present invention sends the flow control processing method flow process of data like Fig. 5, shown in 6, and in like manner, the direction of arrow that dotted line indicates among Fig. 5 is represented the direction that data transmit, and the direction of arrow that solid line indicates is represented flow control signal or removed the sending direction of flow control signal.The present invention includes following steps:
Step 602 ', local terminal L2R stops the transmission sharing buffer reading of data from local terminal;
Step 603 ', local terminal L2R judges whether local terminal receives the releasing flow control signal that far-end L2R sends, if receive, then execution in step 604 '; Otherwise continue to wait for, up to receiving that far-end L2R sends the releasing flow control signal;
Step 604 ', local terminal L2R recovers the transmission sharing buffer reading of data from local terminal, promptly sends data to far-end, execution in step 601 then;
Step 603 ", local terminal L2R sends flow control signal to local terminal TE, local terminal TE stops to send sharing buffer to local terminal and writes data, promptly local terminal L2R stops to send data to far-end;
Step 604 ", local terminal L2R judges that local terminal sends taking up room of sharing buffer and whether is reduced to below the preset threshold value, if, execution in step 606; Otherwise continue to wait for, send taking up room of sharing buffer up to local terminal and be reduced to below the preset threshold value;
Step 605 ", local terminal L2R send to remove flow control signal to local terminal TE, local terminal TE recovers to send sharing buffer to local terminal and writes data, execution in step 603 then.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (12)
1. flow control processing method is applicable to the transfer of data of local terminal and far-end, and local terminal and far-end all comprise radio link protocol RLP entity, layer two relaying L2R and terminal TE at least, and this method comprises:
Be the corresponding periodicity relative timer of each business setting; It is characterized in that this method is further comprising the steps of:
A, local terminal RLP entity the periodicity relative timer then after; Call the function interface of local terminal L2R; Local terminal L2R confirm local terminal the reception sharing buffer take up room surpass preset threshold value after; Local terminal TE sends flow control signal to local terminal L2R, and local terminal L2R stops to write data to the reception sharing buffer of local terminal;
B, local terminal L2R send flow control signal through network to far-end L2R, and far-end L2R stops the transmission sharing buffer reading of data from far-end.
2. method according to claim 1; It is characterized in that after the step B, this method further comprises: local terminal L2R confirm local terminal the reception sharing buffer take up room be reduced to below the preset threshold value after; Local terminal TE sends to local terminal L2R and removes flow control signal; Local terminal L2R recovers to write data to the reception sharing buffer of local terminal, and sends the releasing flow control signal through network to far-end L2R, and far-end L2R recovers the transmission sharing buffer reading of data from far-end.
3. method according to claim 1; It is characterized in that; In the steps A, after the function interface of local terminal RLP entity invokes local terminal L2R, local terminal L2R confirms to take up room above before the predetermined threshold value; This method further comprises: the protocol Data Unit PDU that local terminal L2R sends far-end resolves, and obtains analysis result.
4. method according to claim 3; It is characterized in that; Said obtaining after the analysis result; This method further comprises: local terminal L2R judges whether the taking up room of reception sharing buffer of local terminal surpasses preset threshold value, if do not have to surpass preset threshold value, local terminal L2R writes data according to analysis result to the reception sharing buffer of local terminal.
5. method according to claim 4; It is characterized in that; Local terminal L2R according to analysis result after the reception sharing buffer of local terminal writes data; This method further comprises: local terminal L2R judges whether local terminal receives the flow control signal that far-end L2R sends, if receive that then local terminal L2R stops the transmission sharing buffer reading of data from local terminal; Otherwise local terminal L2R judges whether the taking up room of transmission sharing buffer of local terminal surpasses preset threshold value.
6. method according to claim 5; It is characterized in that; Local terminal L2R stops the transmission sharing buffer reading of data from local terminal, and after confirming to receive the releasing flow control signal that far-end L2R sends, this method further comprises: recover the transmission sharing buffer reading of data from local terminal.
7. method according to claim 5; It is characterized in that; This method further comprises: taking up room of the transmission sharing buffer of local terminal surpasses preset threshold value, and then local terminal L2R sends flow control signal to local terminal TE, and local terminal TE stops to write data to the transmission sharing buffer of local terminal; Otherwise local terminal L2R is from the transmission sharing buffer reading of data of local terminal, according to the framing that requires of the PDU of L2R, the data that read is placed on the transmit queue of local terminal RLP entity, sends data to far-end.
8. method according to claim 7; It is characterized in that local terminal TE stops after the transmission sharing buffer of local terminal writes data, this method further comprises: local terminal L2R confirm local terminal the transmission sharing buffer take up room be reduced to below the preset threshold value after; Local terminal L2R sends to local terminal TE and removes flow control signal; Local terminal TE recovers to write data to the transmission sharing buffer of local terminal, and local terminal L2R is from the transmission sharing buffer reading of data of local terminal, according to the framing that requires of the PDU of L2R; The data that read are placed on the transmit queue of local terminal RLP entity, send data to far-end.
9. flow control processing method is applicable to the transfer of data of local terminal and far-end, and local terminal and far-end all comprise radio link protocol RLP entity, layer two relaying L2R and terminal TE at least, and this method comprises: be the corresponding periodicity relative timer of each business setting; It is characterized in that; This method is further comprising the steps of: local terminal RLP entity the periodicity relative timer then after; Call the function interface of local terminal L2R; The taking up room of transmission sharing buffer of confirming local terminal surpasses after the preset threshold value, and local terminal L2R sends flow control signal to local terminal TE, and local terminal TE stops to write data to the transmission sharing buffer of local terminal.
10. method according to claim 9 is characterized in that, calls after the function interface of local terminal L2R; This method further comprises: local terminal L2R judges whether the taking up room of transmission sharing buffer of local terminal surpasses preset threshold value; If there not be threshold value that surpass to preset, local terminal L2R is from the transmission sharing buffer reading of data of local terminal, according to the framing that requires of the PDU of L2R; The data that read are placed on the transmit queue of local terminal RLP entity, send data to far-end.
11. method according to claim 10; It is characterized in that local terminal TE stops after the transmission sharing buffer of local terminal writes data, this method further comprises: local terminal L2R confirm local terminal the transmission sharing buffer take up room be reduced to below the preset threshold value after; Local terminal L2R sends to local terminal TE and removes flow control signal; Local terminal TE recovers to write data to the transmission sharing buffer of local terminal, and local terminal L2R is from the transmission sharing buffer reading of data of local terminal, according to the framing that requires of the PDU of L2R; The data that read are placed on the transmit queue of local terminal RLP entity, send data to far-end.
12. method according to claim 9; It is characterized in that; The taking up room of transmission sharing buffer of confirming local terminal surpasses before the preset threshold value, and this method further comprises: after local terminal L2R confirmed to receive the flow control signal that far-end L2R sends, local terminal L2R stopped the transmission sharing buffer reading of data from local terminal; After local terminal L2R receives the releasing flow control signal that far-end sends, recover transmission sharing buffer reading of data from local terminal.
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