CN104836646A - Method for enhancing transmission reliability of RLC AM mode - Google Patents
Method for enhancing transmission reliability of RLC AM mode Download PDFInfo
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- CN104836646A CN104836646A CN201410048393.3A CN201410048393A CN104836646A CN 104836646 A CN104836646 A CN 104836646A CN 201410048393 A CN201410048393 A CN 201410048393A CN 104836646 A CN104836646 A CN 104836646A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
Abstract
The application discloses a method for enhancing transmission reliability of a radio link control acknowledgement (RLC AM) mode. By testing a retransmission receiving correct situation via an RLC layer of a receiving terminal, and optionally actively retransmitting certain PDU by a transmitting terminal according to an unoccupied degree of send windows, a situation of RLC status feedback loss is recognized by the RLC layer of the receiving terminal. Furthermore, by exchanging cross-layer information of MAC and RLC, the MAC layer of each of sending and receiving terminals purposefully performs adjustment of MCS transmission according to the status where RLC ARQ retransmission and feedback in. The transmission quality of ARQ retransmission of PDU and RLC status feedback of PDU are improved; the transmission accuracy of ARQ retransmission and RLC status feedback is increased. The method is beneficial for enhancing transmission reliability of a down link of the RLC AM mode.
Description
Technical field
The application relates to wireless communication technology field, particularly relates to a kind of wireless spread-spectrum technology and confirms (RLC AM) mode transfer reliability Enhancement Method.
Background technology
In 3G/4G wireless communication system, base station and core net receive the packet of coming first through PDCP (PDCP, Packet Data Convergence Protocol) layer, after IP Header compression and encryption, forward wireless spread-spectrum technology (RLC to, Radio Link Control) layer, according to medium education (MAC, Media AccessControl) after the transmission demand of layer carries out segmentation and serial connection, forward MAC layer to again, finally form wireless signal from eating dishes without rice or wine and send.
According to business transmission feature and demand, transmission be divided into have connect confirm pledge system transmission with without is connected confirm guarantee transmission.For there being the transmission connecting and confirm to ensure, be exactly that after transmitting terminal sends packet, receiving terminal needs the situation feedback acknowledgment bag according to receiving, whether notice transmitting terminal receives correctly, with this, transmitting terminal determines whether that needs carry out re-transmission and send.There is the business data transmission of forward and reverse feedback acknowledgment transfer of data in this mechanism, by the foundation of two-way link, can ensure the reliability of transfer of data to a great extent simultaneously.Base station side in 3G/4G system, this mechanism is realized by rlc layer.
The feedback acknowledgment that RLC AM pattern adopts and retransmission mechanism are summarized as follows:
Send window VT (A)-VT (MS) and receive window VR (the R)-VR (MR) of fixed size are set.RLC AM pattern send window and corresponding state variable are as shown in Figure 1a, transmitting terminal often sends a protocol Data Unit (PDU, Protocol Data Unit) then can be buffered in send window according to the sequence number sent, and the original position VT of send window (A) is always updated to first cache location confirming to receive successful packet to be feedback, so only have the correct message of reception constantly receiving receiving terminal feedback just can empty corresponding buffer memory bag, and have an opportunity to advance backward.Once send window buffer memory PDU is full, VT (S)=VT (MS), then can not send new data PDU.RLC AM pattern receive window and corresponding state variable are as shown in Figure 1 b.Receiving terminal is that the original position VR (R) of receive window remains on the cache location that first does not receive successful data bag too, only has and confirms to wrap to receive successfully just can be submitted to high level, and empty this buffer memory and have an opportunity to pass backward.
The transmission that receiving terminal carries out feedback states has several situation:
1) transmitting terminal sends polling message to receiving terminal after often sending some packets, and request receiving end sends state feedback information.
2) receiving terminal also arranges reception simultaneously and to reorder timer (T_reordering), after timer expiry is reordered in reception, also initiatively can send state feedback information to transmitting terminal.
Specific implementation process is as follows: in rlc protocol when timer startup is reordered in reception, using state variable V R (X) is updated to the next position of last reception packet in current receive window, i.e. VR (X)=VR (H).The reception timer that reorders checks the loss situation of packet between VR (MS) to VR (X) exactly.Once receive the timer expiry that reorders, the PDU then also do not received in this interval regards as transmission and loses, now VR (MS) is updated to VR (X), carries out state feedback PDU transmission, is indicated to the receiving terminal event of data loss till VR (MS).
3) transmitting terminal is when finding follow-uply do not have data can for transmitting after certain packet of transmission, or find that send window has been expired, then transmitting terminal can initiatively select some bag to carry out HARQ (ARQ) re-transmission, carry polling message to receiving terminal simultaneously, request receiving end sends state feedback information, and starting poll timer (polling), poll timer time-out then continues active retransmission and carries polling message.Receiving terminal produces state feedback information according to the reception condition of rlc layer packet in above-mentioned condition and self receive window, described state feedback information is not the high-rise packet sent, but the control bag that rlc layer produces, do not participate in segmentation that RLC carries out and beading process.In state feedback bag explicit carry each confirmed lose the SN sequence number of RLC PDU or the SN sequence number of RLC PDU segmentation, SOstart territory (position of first character joint in original RLC PDU data field of the RLC PDU segmentation in the data field of instruction RLC PDU) and SOend territory (position of last byte in original RLC PDU data field of the RLC PDU segmentation in the data field of instruction RLC PDU), and last is not confirmed the RLC PDU sequence number (i.e. VR (MS)) of loss situation, then implicit expression receives correctly all the other PDU do not indicated.State feedback PDU owing to not participating in segmentation and beading process, so feedback content can only be carried according to quality of eating dishes without rice or wine in a frame data bag.Transmitting terminal then determines whether the transmission of the ARQ retransmission packet carrying out rlc layer according to the content in state feedback PDU.
Rlc layer is provided with maximum retransmission, receives successfully once retransmit to the feedback acknowledgment that maximum times still do not receive receiving terminal, then can exception throw process.Be report anomalous event to the rrc layer of base station side for rlc layer, cause the link re-establishment of eating dishes without rice or wine that RRC carries out Access Layer.These interruptions that business all can be caused to transmit and delay, serious even causes packet loss.On the other hand, the send window of rlc layer has length to limit, if receive feedback acknowledgment packet delay, send window also can be caused full and block, and then causing data transmission stopping.From upper analysis, when high reliability business is transmitted, adopt and have the transmission of the two-way link of feedback acknowledgment to need forward and reverse link all to have less time delay and reliable transmission performance, forward business datum PDU transmits and the loss of reverse feedback status PDU transmission all can cause the ARQ of RLC to retransmit, and then easily causes send window expire and affect service rate.And the time delay of reverse feedback status PDU transmission equally also can cause transmitting terminal send window completely cannot send new PDU, affect service rate.
In prior art, no matter be that ARQ retransmits or RLC state feedback, be all used as general data bag in MAC layer and treat, the transformation parameter the same with the transmission of common business, guarantee not special on transmission quality.Once occur that channel quality detection error, channel quality are followed the tracks of not in time, avoid frequently changing modulating-coding strategy (MCS, Modulation and Coding Schem) and cause situations such as authorizing expense, the transmission quality pledge system such as the adaptive modulation of MAC layer and coding (AMC, Adaptive Modulation and Coding) all can not ensure the Block Error Rate that any moment all keeps definitely low.And the time-varying characteristics of channel may cause the shake of channel transmission quality in the short time and paroxysmal by mistake bag.In addition due to MAC layer algorithm just for MAC layer face transmission objective and set, consider that rlc layer retransmits and the situation of state feedback not especially.Once state feedback PDU bust this because link condition is bad, or receiving terminal T_reordering set timer is unreasonable or scheduling resource distribute reason and transmission lag, then can affect the speed that send window advances, and then likely cause send window completely to affect the transmission of new data.Once send window completely, transmitting terminal active retransmission PDU can be triggered, more likely have the maximum RLC of arrival retransmit and carry out the risk of RRC reconstruction.Because whether receiving terminal None-identified state feedback PDU transmits loss, also cannot distinguish and judge that RLC PDU does not receive correct concrete reason is because business bust this or feeding back unsuccessful, according to normal feedback information transmission flow or passive can only carry out state feedback by transmitting terminal poll, can not carry out according to rl transmission quality the process that corresponding state feedback PDU reliability strengthens.RLC transmitter side does not carry out corresponding advanced processing according to the vacant situation of send window, only have when send window is expired by the time and just make poll and active retransmission process, but now cause business datum to wait for time delay, and send window full time how to carry out active retransmission, agreement does not have clear stipulaties.
Summary of the invention
This application provides a kind of method that RLC AM mode transfer reliability strengthens, retransmitting and the transmission accuracy of RLC state feedback by strengthening ARQ, strengthen the transmission reliability of link under RLC AM pattern.
The embodiment of the present application provides a kind of RLC AM mode transfer reliability Enhancement Method, comprising:
A, in RLC AM mode transfer process, transmitting terminal judges whether the remaining buffer memory of send window is less than default send window congestion alarm thresholding, if so, judges that send window enters congestion state, performs step B;
B, when send window is in congestion state, if transmitting terminal poll timer is overtime, then judge that whether send window is full, if so, perform step C; Otherwise execution step F;
C, judge whether last protocol Data Unit PDU has obtained ACK feedback acknowledgment in send window, if so, perform step D otherwise perform step e;
In D, selection send window, first PDU not obtaining ACK confirmation carries out active retransmission transmission, and carries poll mark, and process ends;
E, to select in send window first and last do not obtain these two PDU of PDU that ACK confirms and carry out active retransmission transmission, and carry poll mark and process ends;
In F, selection send window, first PDU not obtaining ACK confirmation carries out active retransmission transmission, and carries poll mark and process ends.
Preferably, the method comprises further:
G, receiving terminal wireless spread-spectrum technology rlc layer often send a state feedback PDU, as carried nack message in state feedback PDU, then recording status feedback record information, described state feedback recorded information comprises the nack message set that the transmitting time of state feedback PDU and this state feedback comprise;
After H, transmission state feedback PDU, receiving terminal starts transmission timer for this state feedback;
I, after transmission timer expiry, judge whether to receive each RLC PDU in the nack message set comprised in state feedback corresponding to transmission timer, if all do not received, then record a state feedback NACK and lose event, if receive wherein any one, then return step G;
Preferably, comprise further after step I:
Receiving terminal rlc layer often judges to occur whether the number of times of state feedback NACK loss event is more than or equal to the state feedback nack message pre-set and loses number of times thresholding N continuously, if so, then notifies that receiving terminal MAC layer generation state feedback NACK loses event.
Preferably, the method comprises further: after receiving terminal rlc layer receives the RLC PDU that bottom submits, if find that this RLC PDU comprises polling message, and its No. SN outside receive window, then judge that present condition feeding back ACK loses event, and notify receiving terminal MAC layer.
Preferably, the method comprises further:
Transmitting terminal rlc layer record HARQ ARQ number of retransmissions, and ARQ re-transmission alarming threshold is set, retransmit alarming threshold when the some RLC PDU number of retransmissions of discovery are more than or equal to ARQ, then notify transmitting terminal MAC layer;
After transmitting terminal MAC layer is notified, the interim modulating-coding strategy MCS reducing the described ARQ retransmission packet of transmission and use, asks for data retransmission with the transmitted data amount corresponding to the MCS lower than other transfer of data to transmitting terminal rlc layer;
The transmitted data amount that transmitting terminal rlc layer provides according to transmitting terminal MAC layer is carried out segmentation to retransmission packet or is transmitted after segmentation.
Preferably, the method comprises further:
Receiving terminal MAC layer receives after state feedback NACK that rlc layer informs or ACK loses report, interim reduction transmission state feeds back the MCS used, and asks for state feedback data with the transmitted data amount corresponding to the MCS lower than other transfer of data to receiving terminal rlc layer;
The transmitted data amount that receiving terminal rlc layer provides according to receiving terminal MAC layer is carried out segmentation to state feedback bag or is transmitted after segmentation.
As can be seen from the above technical solutions, receive correct situation by receiving terminal rlc layer retransmission detection, and transmitting terminal is according to the vacant degree of the send window specific PDU of active retransmission selectively, helps receiving terminal rlc layer identification RLC state feedback loss situation; Further, by MAC and RLC cross-layer information exchange, make the state of the two MAC layer sending out respective of transmitting-receiving residing for RLC ARQ re-transmission and feedback carry out the adjustment transmitted on MCS respectively targetedly and improve the transmission quality that ARQ retransmits PDU and RLC state feedback PDU, strengthen ARQ to retransmit and the transmission accuracy of RLC state feedback, be conducive to the transmission reliability of link under RLC AM pattern.
Accompanying drawing explanation
Fig. 1 a is RLC AM pattern send window and corresponding state variable schematic diagram;
Fig. 1 b is RLC AM pattern receive window and corresponding state variable schematic diagram;
The handling process schematic diagram of the congested active retransmission of transmitting terminal send window that Fig. 2 provides for the embodiment of the present application;
The receive window of the receiving terminal that Fig. 3 provides for the embodiment of the present application detects the handling process schematic diagram of RLC state feedback nack message loss;
Fig. 4 carries out the handling process schematic diagram of the MCS adjustment of ARQ re-transmission for transmitting terminal MAC layer that the embodiment of the present application provides.
Embodiment
This application provides a kind of method that RLC AM mode transfer reliability strengthens, correct situation is received by receiving terminal rlc layer retransmission detection, and transmitting terminal is according to the vacant degree of the send window specific PDU of active retransmission selectively, help receiving terminal rlc layer identification RLC state feedback loss situation; Further, by MAC and RLC cross-layer information exchange, make the state of the two MAC layer sending out respective of transmitting-receiving residing for RLC ARQ re-transmission and feedback carry out the adjustment transmitted on MCS respectively targetedly and improve the transmission quality that ARQ retransmits PDU and RLC state feedback PDU, strengthen ARQ to retransmit and the transmission accuracy of RLC state feedback, be conducive to the transmission reliability of link under RLC AM pattern.
For making the know-why of technical scheme, feature and technique effect clearly, below in conjunction with specific embodiment, technical scheme is described in detail.
This application provides a kind of method that RLC AM mode transfer reliability strengthens, comprise transmitting terminal process and receiving terminal process two aspects.The process of transmitting terminal comprises the MCS adjustment that the congested active retransmission of send window and transmitting terminal MAC layer carry out ARQ re-transmission; The process of receiving terminal comprises receive window and detects RLC state feedback nack message loss or ACK information loss, and receiving terminal MAC layer carries out the MCS adjustment of RLC state feedback.
Fig. 2 shows the handling process of the congested active retransmission of transmitting terminal send window that the embodiment of the present application provides, and comprising:
Step 201: transmitting terminal arranges send window congestion alarm thresholding.
Step 202: in RLC AM mode transfer process, transmitting terminal judges that the remaining buffer memory of send window (this buffer memory=VT (MS)-VT (S)) is less than default send window congestion alarm thresholding, then judge that send window enters congestion state, performs step 203.
Step 203: when send window is in congestion state, if transmitting terminal poll timer is overtime, then judges that whether send window is full, if so, performs step 204, otherwise performs step 207.
Step 204: judge last PDU(and VT (S)-1 in send window) whether obtain ACK feedback acknowledgment, if so, perform step 205, otherwise perform step 206.
Step 205: select PDU(and VT (A) that in send window, first does not obtain ACK and confirm) carry out active retransmission transmission, and carry poll mark, then process ends.
Step 206: select first these two PDU of PDU not obtaining ACK confirmation with last in send window to carry out active retransmission transmission, and carry poll mark, then process ends.Why carrying out active retransmission to the PDU that last does not obtain ACK confirmation in this case, is in order to avoid last bag data transmission fails causes receiving terminal cannot carry out the feedback acknowledgment of ACK and NACK to last bag data of transmitting terminal.
Step 207: select PDU(and VT (A) that in send window, first does not obtain ACK and confirm) carry out active retransmission transmission, and carry poll mark.
This operation has two effects: the bag active retransmission first not being received to ACK confirmation can accelerate re-transmission speed, the speed that the send window increasing resource anxiety is passed backward; Inform receiving terminal rlc layer in this way, the window original position of transmitting terminal, make receiving terminal rlc layer have an opportunity to judge the loss situation of state feedback ACK information.
The receive window of the receiving terminal that Fig. 3 provides for the embodiment of the present application detects the handling process of RLC state feedback nack message loss, comprises the steps:
Step 301: receiving terminal rlc layer often sends a state feedback PDU, as carried nack message in state feedback PDU, then recording status feedback record information, described state feedback recorded information comprises the nack message set that the transmitting time of state feedback PDU and this state feedback comprise.
Step 302: after sending state feedback PDU, receiving terminal starts transmission timer for this state feedback.
Step 303: after transmission timer expiry, judges whether to receive each RLC PDU in the nack message set comprised in state feedback corresponding to transmission timer, if all do not received, then records a state feedback NACK and loses event; If receive wherein any one, then return step 301.
Step 304: judge to occur whether the number of times of state feedback NACK loss event is more than or equal to the state feedback nack message pre-set and loses number of times thresholding N, if so, then notifies that MAC layer generation state feedback NACK loses event continuously.
The mode that the receive window that the embodiment of the present application provides detects RLC state feedback ACK information loss is as follows:
After receiving terminal rlc layer receives the RLC PDU that bottom submits, if find that this RLC PDU comprises polling message, and its No. SN outside receive window.Then judge that present condition feeding back ACK loses event, and notify MAC layer..
The transmitting terminal MAC layer that the embodiment of the present application provides carries out the handling process of the MCS adjustment of ARQ re-transmission as shown in Figure 4, comprising:
Step 401: transmitting terminal rlc layer record ARQ number of retransmissions, and ARQ re-transmission alarming threshold is set, this thresholding should be less than or equal to the maximum RLC number of retransmissions of Operation system setting.
Step 402: when transmitting terminal rlc layer finds that certain RLC PDU number of retransmissions is more than or equal to ARQ and retransmits alarming threshold, then notify transmitting terminal MAC layer.
Step 403: after transmitting terminal MAC layer is notified, then the interim MCS reducing this ARQ retransmission packet of transmission and use, asks for data retransmission with the transmitted data amount corresponding to the MCS lower than other transfer of data to transmitting terminal rlc layer.
Step 404: the transmitted data amount that transmitting terminal rlc layer provides according to transmitting terminal MAC layer carries out segmentation or segment transmissions again to retransmission packet.Because each ARQ retransmits the low order MCS transmission that segmentation uses, improve the transmission accuracy that ARQ retransmits PDU, and the transmission correct probability of wherein RLC SDU.
Similarly, the MCS method of adjustment that the receiving terminal MAC layer that the embodiment of the present application provides carries out RLC state feedback comprises: receiving terminal MAC layer receives after state feedback NACK that rlc layer informs or ACK loses report, interim reduction transmission state feeds back the MCS used, and asks for state feedback data with the transmitted data amount corresponding to the MCS lower than other transfer of data to receiving terminal rlc layer; The transmitted data amount that receiving terminal rlc layer provides according to receiving terminal MAC layer is carried out segmentation to state feedback bag or is transmitted after segmentation.
Technical scheme can realize following technique effect:
Receiving terminal rlc layer judges the nack message loss situation in RLC state feedback by the re-transmission reception condition detected in receive window in respective range, and notifies that MAC carries out respective handling, can strengthen RLC state feedback transmission reliability;
Transmitting terminal rlc layer is taken by send window and selects first unacknowledged RLC PDU active retransmission with vacant situation and carry polling message, receiving terminal RLC judges ACK information loss situation in RLC state feedback by No. SN of receiving poll bag in the position of receive window simultaneously, and notify that MAC carries out respective handling, strengthen RLC state feedback transmission reliability;
MAC layer retransmits according to the ARQ of rlc layer and the state of RLC state feedback adjusts its transmission MCS, can strengthen its transmission reliability.
The foregoing is only the preferred embodiment of the application; not in order to limit the protection range of the application; within all spirit in technical scheme and principle, any amendment made, equivalent replacements, improvement etc., all should be included within scope that the application protects.
Claims (6)
1. wireless spread-spectrum technology confirms a RLC AM mode transfer reliability Enhancement Method, it is characterized in that, comprising:
A, in RLC AM mode transfer process, transmitting terminal judges whether the remaining buffer memory of send window is less than default send window congestion alarm thresholding, if so, judges that send window enters congestion state, performs step B;
B, when send window is in congestion state, if transmitting terminal poll timer is overtime, then judge that whether send window is full, if so, perform step C; Otherwise execution step F;
C, judge whether last protocol Data Unit PDU has obtained ACK feedback acknowledgment in send window, if so, perform step D otherwise perform step e;
In D, selection send window, first PDU not obtaining ACK confirmation carries out active retransmission transmission, and carries poll mark, and process ends;
E, to select in send window first and last do not obtain these two PDU of PDU that ACK confirms and carry out active retransmission transmission, and carry poll mark and process ends;
In F, selection send window, first PDU not obtaining ACK confirmation carries out active retransmission transmission, and carries poll mark and process ends.
2. method according to claim 1, is characterized in that, the method comprises further:
G, receiving terminal wireless spread-spectrum technology rlc layer often send a state feedback PDU, as carried nack message in state feedback PDU, then recording status feedback record information, described state feedback recorded information comprises the nack message set that the transmitting time of state feedback PDU and this state feedback comprise;
After H, transmission state feedback PDU, receiving terminal starts transmission timer for this state feedback;
I, after transmission timer expiry, judge whether to receive each RLC PDU in the nack message set comprised in state feedback corresponding to transmission timer, if all do not received, then record a state feedback NACK and lose event, if receive wherein any one, then return step G.
3. method according to claim 2, is characterized in that, comprises further after step I:
Receiving terminal rlc layer often judges to occur whether the number of times of state feedback NACK loss event is more than or equal to the state feedback nack message pre-set and loses number of times thresholding N continuously, if so, then notifies that receiving terminal MAC layer generation state feedback NACK loses event.
4. method according to claim 1, it is characterized in that, the method comprises further: after receiving terminal rlc layer receives the RLC PDU that bottom submits, if find that this RLC PDU comprises polling message, and its No. SN outside receive window, then judge that present condition feeding back ACK loses event, and notify receiving terminal MAC layer.
5. method according to claim 1, is characterized in that, the method comprises further:
Transmitting terminal rlc layer record HARQ ARQ number of retransmissions, and ARQ re-transmission alarming threshold is set, retransmit alarming threshold when the some RLC PDU number of retransmissions of discovery are more than or equal to ARQ, then notify transmitting terminal MAC layer;
After transmitting terminal MAC layer is notified, the interim modulating-coding strategy MCS reducing the described ARQ retransmission packet of transmission and use, asks for data retransmission with the transmitted data amount corresponding to the MCS lower than other transfer of data to transmitting terminal rlc layer;
The transmitted data amount that transmitting terminal rlc layer provides according to transmitting terminal MAC layer is carried out segmentation to retransmission packet or is transmitted after segmentation.
6. method according to claim 1, is characterized in that, the method comprises further:
Receiving terminal MAC layer receives after state feedback NACK that rlc layer informs or ACK loses report, interim reduction transmission state feeds back the MCS used, and asks for state feedback data with the transmitted data amount corresponding to the MCS lower than other transfer of data to receiving terminal rlc layer;
The transmitted data amount that receiving terminal rlc layer provides according to receiving terminal MAC layer is carried out segmentation to state feedback bag or is transmitted after segmentation.
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| WO2022027213A1 (en) * | 2020-08-04 | 2022-02-10 | Qualcomm Incorporated | Network coding augmented radio link control (rlc) layer communication |
| CN114556840A (en) * | 2019-10-24 | 2022-05-27 | 高通股份有限公司 | Operating in radio link control acknowledgement mode using multicast or broadcast radio bearers |
| CN114630283A (en) * | 2020-12-11 | 2022-06-14 | 维沃移动通信有限公司 | Method, device, equipment and storage medium for confirming mode transmission of multicast service |
| CN114785464A (en) * | 2022-06-20 | 2022-07-22 | 希诺麦田技术（深圳）有限公司 | Automatic data retransmission method and application of wireless ad hoc network |
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| US11909535B2 (en) | 2019-10-24 | 2024-02-20 | Qualcomm Incorporated | Operating in a radio link control acknowledged mode using a multicast or broadcast radio bearer |
| CN114556840B (en) * | 2019-10-24 | 2023-12-26 | 高通股份有限公司 | Operating in radio link control acknowledged mode using multicast or broadcast radio bearers |
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| CN112671515A (en) * | 2020-12-09 | 2021-04-16 | 中国电子科技集团公司第五十四研究所 | Method for transmitting limited retransmission data of radio link control layer |
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| CN114785464B (en) * | 2022-06-20 | 2022-09-02 | 希诺麦田技术（深圳）有限公司 | Automatic data retransmission method and application of wireless ad hoc network |
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