CN101488841B - Frame retransmission method and apparatus for radio link protocol - Google Patents
Frame retransmission method and apparatus for radio link protocol Download PDFInfo
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Abstract
The invention relates to a wireless link protocol RLP frame retransmission method and apparatus, the method comprises following steps: a RLP layer preserves a lost frame sequence number in a time delay caching area, when the received frame sequence number L_SEQ is smaller than the expecting received lower frame sequence number, if no sequence number same as the L_SEQ is in the time delay caching area, so that the received frame in the present is discarded, the sequence number of the lost frame is calculated, and the corresponding sequence number can be preserved in the time delay caching area, meanwhile, the lost frame sequence number before the presetting value is inserted into a negative response NAK list, when the transmitting time is coming, the NAK is transmitted to the opposite terminal RLP layer, the lost frame is required for transmitting; the apparatus comprises a received module, a control module, a time delay caching module, a reordering caching module, an NAK list module and a transmitting module. The invention improves the compatibility of the RLP layer for various application scenes, can ensure that the RLP layer retransmission rate is low and the transmission rate of the RLP layer is constant under the condition of large shake.
Description
Technical field
The present invention relates to field of wireless data communication, relate to especially code division multiple access (Code Division Multiple Access, CDMA) a kind of radio link protocol (Radio Link Protocol, RLP) frame retransmission method and device in the communication system.
Background technology
Wireless communication system becomes one of most popular means of communication of people gradually.These systems can support a plurality of users and the multi-address system of communicating by letter that the polytype service is provided, comprise based on frequency division multiple access (Frequency Division Multiple Access, FDMA), time division multiple access (Time Division Multiple Access, TDMA), CDMA or other multiple access technology.Cdma system relies on its high power capacity, the characteristics such as efficient, cheap to cause user's concern.
Because wireless environment is subjected to ectocine larger, aloft the frame error rate of Frame (Frame Error Rate, FER) is relatively high in the transmission course.Therefore need to introduce the reliability that a quasi-protocol guarantees the transmission of wireless system bottom.Cdma system is the reliability that guarantees transfer of data by the RLP retransmission mechanism when Packet data service is provided.RLP is used in link layer protocol for the error correction Network Based of guaranteeing to stablize transfer of data by GSM (Globe System for Mobil Communication, global system for mobile communications) and CDMA.Transfer of data is behind the RLP layer, and the RLP layer can produce the continuous and unique rlp frame of sequence number.When rlp frame was lost in transmission course or made mistakes, receiving terminal RLP layer can require transmitting terminal RLP layer to resend the Frame of losing or makeing mistakes by replying NAK (Negative Acknowlegment, negative response).Transmitting terminal RLP layer can resend corresponding rlp frame after receiving NAK.Continuous a plurality of rlp frames that while receiving terminal RLP layer will be received form Packet Generations to be processed to a upper protocol layer.
Under normal circumstances, said method has well solved the problem of the stability of transfer of data in the wireless system.But under the larger condition of the shakes such as satellite link transmission, Ethernet transmission, wrong frame, out of order situation can appear, no matter be wrong frame or out of orderly receiving terminal RLP layer received than expectation sequentially receive the frame that frame number is little or the large frame of next frame sequence number of receiving than expectation, if according to original RLP retransmission mechanism, will send NAK to the opposite end, retransmission rate can occur this moment and raise, the RLP number of resets increases, degradation problem under the transmission rate.Finally have influence on the user to the normal use of data business.
Therefore introducing the stronger RLP retransmission mechanism of a kind of compatibility and stability has very important significance to the promotion and application tool of wireless system data service.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of RLP repeating method and device, to overcome the problem that the RLP retransmission rate is high, the RLP number of resets increases, transmission rate descends under the larger environment of shake that exists in the prior art.
Rlp frame repeating method of the present invention, receiving terminal RLP layer is kept at the sequence number of lost frames in the time-delay buffer area, during the sequence number L_V (R) of the next frame that receives less than expectation as the sequence number L_SEQ of the frame that receives, judge whether the sequence number identical with described L_SEQ is arranged in the described time-delay buffer area, if have, then corresponding sequence number is deleted from described time-delay buffer area, and the described current frame that receives is sent into the buffer area that reorders; Otherwise, abandon the current frame that receives, calculate the sequence number of lost frames, and with corresponding sequence number be saved in the time-delay buffer area in, sequence number with the lost frames before the preset value is inserted in the negative response NAK tabulation simultaneously, sends NAK to transmitting terminal RLP layer when delivery time arrives, and requires the frame of retransmission of lost.
After described receiving terminal RLP layer receives frame, at first extract the sequence number L_SEQ of described frame.
If described L_SEQ＞L_V (R), then described receiving terminal RLP layer is carried out following operation:
Steps A: compare with described L_SEQ and described L_V (R) absolute value that subtracts each other and the first threshold a that presets, if described | and L_SEQ-L_V (R) |≤a, then execution in step E; If described | L_SEQ-L_V (R) |＞a, then execution in step B;
Step B: judge whether described L_SEQ is continuous with the sequence number of a upper abnormal frame, if, execution in step C then; Otherwise, execution in step D;
Step C: whether the abnormal frame counter adds the 1 rear currency of judging counter greater than default Second Threshold b, if, execution in step E then; Otherwise, execution in step D;
Step D: abandon the described current frame that receives, and zero clearing abnormal frame counter, this frame processing finishes;
Step e: calculate the sequence number of lost frames, and the lost frames sequence number that calculates is inserted in the NAK tabulation.
If the current frame that receives of described receiving terminal RLP layer is the frame that expectation sequentially receives, then described receiving terminal RLP layer is sent present frame into the buffer area that reorders, and this frame processing finishes.
If the current frame that receives of described receiving terminal RLP layer is not the frame that expectation sequentially receives, then carry out following steps:
Step a: the sequence number L_V (N) of the frame that comparison L_SEQ and expectation sequentially receive, if L_SEQ＞L_V (N), then execution in step b; If L_SEQ＜L_V (N), then execution in step c;
Step b: the size that compares L_SEQ and L_V (R);
Step c: compare with described L_SEQ and described L_V (N) absolute value that subtracts each other and the 3rd threshold value c that presets, if described | and L_SEQ-L_V (N) |≤c, then abandon the described current frame that receives, this frame processing finishes; If described | L_SEQ-L_V (N) |＞c, then receiving terminal RLP layer initiates to reset, and this frame processing finishes.
When described receiving terminal RLP layer is inserted into the NAK tabulation with the sequence number of lost frames, also the sequence number of respective frame is deleted from described time-delay buffer area.
Described receiving terminal RLP layer can be saved in numbering of lost frames sequence number distribution in the described time-delay buffer area for each, and also deletes corresponding numbering in deletion lost frames sequence number.
Described preset value equals to be saved at last the poor of the numbering n of the lost frames sequence number in the described time-delay buffer area and the 4th threshold value d.
After lost frames sequence number in the described time-delay buffer area was deleted, the frame number of its back moved forward successively.
The present invention further discloses a kind of rlp frame retransmission arrangement, comprises receiver module, control module, time-delay cache module, the cache module that reorders, NAK list block and sending module, and is described
Receiver module is used for receiving rlp frame, extracts L_SEQ and sends to described control module;
Control module is used for comparing the size of L_SEQ and L_V (R); Be used for during less than L_V (R), judging whether the sequence number identical with current L_SEQ is arranged in the described time-delay buffer area at L_SEQ; Be used for calculating the sequence number of lost frames; Be used for adding the sequence number of lost frames to described time-delay cache module, perhaps from described time delay module, delete; Be used for the frame that receives is abandoned or send into the described cache module that reorders; Be used for the sequence number of the lost frames before the preset value is inserted into the NAK list block;
The time-delay cache module is used for the sequence number of cache miss frame;
The cache module that reorders is used for the normal frame of buffer memory;
The frame number that the NAK list block is used for storage and needs to retransmit is tabulated;
Sending module sends NAK to transmitting terminal RLP layer for the NAK tabulation according to the NAK list block when delivery time arrives.
Described control module also is used for calculating the absolute value that described current L_SEQ and L_V (R) subtract each other; Be used for judging absolute value that described current L_SEQ and L_V (R) subtract each other and the size of a; Be used for judging whether described current L_SEQ is continuous with the sequence number of a upper abnormal frame; Be used for adding 1 or zero clearing abnormal frame counter; Size for the currency and the b that judge described counter; The size that is used for more described current L_SEQ and L_V (N); Be used for calculating the absolute value that described current L_SEQ and described L_V (N) subtract each other; Be used for judging absolute value that described current L_SEQ and described L_V (N) subtract each other and the size of c; Be used for initiating to reset.
Prior art of the present invention is compared, and has improved the compatibility of RLP layer to various application scenarioss, makes it can guarantee still that in the larger situation of shake the RLP retransmission rate is low and transmission rate is constant.
Description of drawings
Fig. 1 is the block diagram of device of the present invention;
Fig. 2 is the flow chart of the method for the invention;
Fig. 3 is the interacting message schematic diagram of RLP interlayer.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment the present invention is further introduced.
As shown in Figure 1, be rlp frame retransmission arrangement of the present invention, comprise receiver module, control module, time-delay cache module, the cache module that reorders, NAK list block and sending module, wherein,
Receiver module is used for receiving rlp frame, extracts L_SEQ and sends to control module;
Control module is used for comparing the size of L_SEQ and L_V (R); Be used for during less than L_V (R), judging whether the sequence number identical with current L_SEQ is arranged in the described time-delay buffer area at L_SEQ; Be used for calculating the sequence number of lost frames; Be used for adding the sequence number of lost frames to the time-delay cache module, perhaps from time delay module, delete; Be used for the frame that receives is abandoned or send into the cache module that reorders; Be used for the sequence number of the lost frames before the preset value is inserted into the NAK list block; Also be used for calculating the absolute value that current L_SEQ and L_V (R) subtract each other; Be used for judging absolute value that current L_SEQ and L_V (R) subtract each other and the size of a; Be used for judging whether current L_SEQ is continuous with the sequence number of a upper abnormal frame; Be used for adding 1 or zero clearing abnormal frame counter; Be used for judging the currency of counter and the size of b; The size that is used for more current L_SEQ and L_V (N); Be used for calculating the absolute value that current L_SEQ and described L_V (N) subtract each other; Be used for judging absolute value that current L_SEQ and described L_V (N) subtract each other and the size of c; Be used for initiating to reset;
The time-delay cache module is used for the sequence number of cache miss frame;
The cache module that reorders is used for the normal frame of buffer memory;
The frame number that the NAK list block is used for storage and needs to retransmit is tabulated;
Sending module sends NAK to transmitting terminal RLP layer for the NAK tabulation according to the NAK list block when delivery time arrives.
As shown in Figure 2, be the flow chart of the method for the invention, in conjunction with Fig. 3, specifically comprise the steps:
Step 200: after receiving terminal RLP layer receives rlp frame, extract the sequence number L_SEQ of present frame;
Step 201: relatively frame number L_V (N) is sequentially received in L_SEQ and expectation, if L_SEQ＜L_V (N), then execution in step 202; If L_SEQ=L_V (N), then execution in step 205; If L_SEQ＞L_V (N), then execution in step 206;
Step 202: relatively | L_SEQ-L_V (N) | with the 3rd default threshold value c, if | L_SEQ-L_V (N) |≤c, then execution in step 203; If | L_SEQ-L_V (N) |＞c, execution in step 204;
In the present embodiment, the value of c gets 100;
Step 203: abandon present frame, this frame is disposed, and can begin the processing of next frame;
Step 204: initiate to reset, this frame is disposed, and can begin the processing of next frame;
Step 205: then present frame is sent into the buffer area that reorders, the rear group of bag that reorder sends to a protocol layer, and this frame processing finishes, and can begin the processing of next frame;
Step 206: judge the next frame sequence number L_V (R) whether L_SEQ receives greater than expectation; If then execution in step 207; Otherwise, execution in step 213;
Step 207: relatively | L_SEQ-L_V (R) | with default first threshold a, if | L_SEQ-L_V (R) |≤a, then execution in step 212; If | L_SEQ-L_V (R) |＞a, then execution in step 208;
In the present embodiment, the value of a gets 50;
Step 208: judge whether L_SEQ is continuous with the sequence number of a upper abnormal frame, if then execution in step 209; Otherwise, think that present frame is abnormal frame, execution in step 211;
Step 209: the abnormal frame counter adds 1,
Step 210: whether judge the currency of counter greater than Second Threshold b, if think that then present frame is normal frame, execution in step 212; Otherwise, think that present frame is abnormal frame, execution in step 211;
In the present embodiment, the value of b gets 7;
Step 211: abandon this frame, zero clearing abnormal frame counter, this frame is disposed, and can begin the processing of next frame;
Step 212: calculate the sequence number of lost frames, and be inserted in the NAK tabulation execution in step 217;
Step 213: judge in the time-delay buffer area whether have the frame number identical with L_SEQ, if then execution in step 214; Otherwise, execution in step 215;
Step 214: frame number and the numbering thereof identical with L_SEQ in the deletion time-delay buffer area, the frame number of this frame number back moves forward successively, simultaneously present frame is sent into the buffer area that reorders, and this frame is disposed, and can begin the processing of next frame;
Step 215: abandoning the current frame that receives, calculate the sequence number of lost frames, and the lost frames sequence number that calculates is saved in the time-delay buffer area, is that corresponding sequence number is distributed a numbering simultaneously;
Step 216: the sequence number of the lost frames before the numbering n that will be saved at last the lost frames sequence number of time-delay in the buffer area and the difference of the 4th threshold value d is inserted into NAK and tabulates, simultaneously corresponding sequence number and numbering thereof are deleted from the time-delay buffer area, remaining frame number moves forward successively;
In the present embodiment, the value of d gets 2;
Step 217: delivery time then sends NAK according to the information in the NAK tabulation to transmitting terminal RLP layer, requires the rlp frame of retransmission of lost.
Among the present invention, the threshold value that relates to is natural number, and the scope that the NAK number that its value Main Basis transmitting terminal RLP layer can receive and system can tolerate shake is determined.
The above is preferred embodiment of the present invention only, is not for restriction protection scope of the present invention.Should be understood that; concerning the those of ordinary skill in field, the technology of the present invention place; can be equal to accordingly according to technical scheme of the present invention and design thereof and change or replace, and all these changes or replacement, all should belong to the protection range of claims of the present invention.
Claims (7)
1. a radio link protocol rlp frame repeating method is characterized in that, receiving terminal RLP layer is kept in the time-delay buffer area size of the sequence number of the frame that the sequence number of the more current frame that receives and expectation sequentially receive with the sequence number of lost frames;
During the sequence number of the frame that sequentially receives less than described expectation when the sequence number of the described current frame that receives, the absolute value that the sequence number of the frame that receives with sequence number and the described expectation of the described current frame that receives is subtracted each other compares with the 3rd default threshold value, if described absolute value is less than or equal to described the 3rd threshold value, then abandon the described current frame that receives, and finish this frame and process; If described absolute value is greater than described the 3rd threshold value, then the RLP layer initiates to reset, and finishes this frame and process;
During the sequence number of the frame that sequentially receives greater than described expectation when the sequence number of the described current frame that receives, the sequence number of the next frame whether sequence number of judging the described current frame that receives receives greater than expectation;
During the sequence number of the next frame that receives less than described expectation when the sequence number of the described current frame that receives, judge whether the sequence number identical with the sequence number of the described current frame that receives is arranged in the described time-delay buffer area, if have, then corresponding sequence number is deleted from described time-delay buffer area, and the described current frame that receives is sent into the buffer area that reorders; Otherwise, abandon the current frame that receives, calculate the sequence number of lost frames, and with corresponding sequence number be saved in the time-delay buffer area in, sequence number with the lost frames before the preset value is inserted in the negative response NAK tabulation simultaneously, sends NAK to transmitting terminal RLP layer when delivery time arrives, and requires the frame of retransmission of lost;
If the sequence number of the next frame that the sequence number of the described current frame that receives receives greater than expectation, then described receiving terminal RLP layer is carried out following operation:
Steps A: the absolute value that the sequence number of the next frame that receives with sequence number and the described expectation of the described current frame that receives is subtracted each other compares with default first threshold, if described absolute value less than or equal to described first threshold, execution in step E then; If described absolute value is greater than described first threshold, execution in step B then;
Step B: whether the sequence number of judging the described current frame that receives is continuous with the sequence number of a upper abnormal frame, if, execution in step C then; Otherwise, execution in step D;
Step C: whether the abnormal frame counter adds the 1 rear currency of judging described counter greater than default Second Threshold, if, execution in step E then; Otherwise, execution in step D;
Step D: abandon the described current frame that receives, and zero clearing abnormal frame counter, this frame processing finishes;
Step e: calculate the sequence number of lost frames, and the lost frames sequence number that calculates is inserted in the NAK tabulation;
If the current frame that receives of described receiving terminal RLP layer is the frame that expectation sequentially receives, then described receiving terminal RLP layer is sent present frame into the buffer area that reorders, and this frame processing finishes;
Wherein, described first threshold is 50, Second Threshold is 7.
2. rlp frame repeating method as claimed in claim 1 is characterized in that, after described receiving terminal RLP layer receives frame, at first extracts the sequence number of described frame.
3. rlp frame repeating method as claimed in claim 1 or 2 is characterized in that, if the current frame that receives of described receiving terminal RLP layer is not the frame that expectation sequentially receives, then carries out following steps:
Step a: the sequence number of the frame that the sequence number of the more current frame that receives and expectation sequentially receive, if the sequence number of the frame that the sequence number of the current frame that receives sequentially receives greater than expectation, then execution in step b; If the sequence number of the frame that the sequence number of the current frame that receives sequentially receives less than expectation, then execution in step c;
Step b: the size of the sequence number of the next frame that the sequence number of the more current frame that receives and expectation receive;
Step c: the absolute value that the sequence number of the frame that receives with sequence number and the described expectation of the described current frame that receives is subtracted each other compares with the 3rd default threshold value, if described absolute value is less than or equal to described the 3rd threshold value, then abandon the described current frame that receives, this frame processing finishes; If described absolute value is greater than described the 3rd threshold value, then receiving terminal RLP layer initiates to reset, and this frame processing finishes, and wherein said the 3rd threshold value is 100.
4. rlp frame repeating method as claimed in claim 1 is characterized in that, when described receiving terminal RLP layer is inserted into the NAK tabulation with the sequence number of lost frames, also the sequence number of respective frame is deleted from described time-delay buffer area.
5. rlp frame repeating method as claimed in claim 1 is characterized in that, described receiving terminal RLP layer can be saved in numbering of lost frames sequence number distribution in the described time-delay buffer area for each, and also deletes corresponding numbering in deletion lost frames sequence number.
6. rlp frame repeating method as claimed in claim 1 is characterized in that, described preset value equals to be saved at last the poor of the numbering of the lost frames sequence number in the described time-delay buffer area and the 4th threshold value, and described the 4th threshold value is 2.
7. such as claim 1 or 4 described rlp frame repeating methods, it is characterized in that after the lost frames sequence number in the described time-delay buffer area was deleted, the frame number of its back moved forward successively.
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| CN103716140B (en) * | 2013-12-26 | 2017-02-15 | 中国工程物理研究院计算机应用研究所 | Data release and reception method based on self-adaptive complementary mechanism |
| CN105553785A (en) * | 2016-01-27 | 2016-05-04 | 华为技术有限公司 | IDLE frame filtering method and device |
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