CN113315608A - Method, system, medium and communication system for dynamically determining retransmission PDU - Google Patents
Method, system, medium and communication system for dynamically determining retransmission PDU Download PDFInfo
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- CN113315608A CN113315608A CN202110486213.XA CN202110486213A CN113315608A CN 113315608 A CN113315608 A CN 113315608A CN 202110486213 A CN202110486213 A CN 202110486213A CN 113315608 A CN113315608 A CN 113315608A
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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
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1848—Time-out mechanisms
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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
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/188—Time-out mechanisms
Abstract
The invention provides a method, a system, a medium and a communication system for dynamically determining PDU retransmission, comprising: step S1: determining the package content according to the size of the grant to package to obtain a TB package; step S2: judging whether the current TB packet package meets the Polling 1 setting condition according to an 38.322 protocol, and adding a P bit to the PDU corresponding to the current TB packet package when the Polling 1 setting condition is met; step S3: the sub RB records all SN numbers in the current TB group package, and simultaneously records the sectional information of the SN of the sections; step S4: if the PollRetransmit timer is overtime due to the fact that the state packet of the opposite end is not received within the preset time, the condition that no new SDU or SDU segmentation is carried out is met; step S5: and dynamically determining the size of the PDU to be retransmitted according to the size of the network authorization. The invention solves the problem that if the authorization is smaller and the segmentation is needed, only a certain segment of the PDU is transmitted, and the complete PDU is not retransmitted any more, thereby reducing the retransmission times.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a method, system, medium, and communication system for dynamically determining a PDU retransmission.
Background
The fifth generation mobile communication technology is a new generation cellular mobile communication technology, and has the characteristics of high speed, low time delay and large capacity. An rlc (radio link control) protocol is an important layer of protocol in a 5G data path, and is mainly used for solving functions of segmentation/reassembly, ARQ, duplicate packet detection, and the like of data. The 38.322 protocol is a specification that directs the implementation of RLC designs.
38.322 the AM ARQ mechanism in the protocol uses PollRetransmit timer, its main role is to prevent the receiver not responding the status packet in time to cause the sender to generate the dead sending window.
In practice, there is often a case of sparse data transmission, and at this time, after the poll transmit timer expires, there is a case of no data transmission (both a new data packet and a retransmission data packet are already lighted), and the protocol also indicates that at this time, a PDU with the highest SN (the upper edge of a transmission window) that has been transmitted can be selected for retransmission, and any PDU that does not receive ACK at the receiving end can be selected for retransmission. However, whichever method is adopted to fixedly select the retransmission of a certain SN PDU has the following disadvantages:
1) when the uplink channel is good, the network gives a larger grant, and if only a PDU with a certain SN is selected for retransmission, many padding bits may need to be added, which is a large waste for the network grant at this time.
2) When the uplink channel is poor, the network gives smaller authorization, and the fixed selection of the retransmission of the PDU of a certain SN may exceed the network authorization size, so that multiple segmented retransmissions are required to complete the retransmission.
Patent document CN106411478B (application No.: 201510465763.8) discloses a method for RLC to retransmit PDUs after a poll retransmission timer expires, and selects an appropriate PDU from an already transmitted PDU queue as a retransmission PDU in the case where no data is available in an SDU queue and a PDU queue requiring retransmission after the poll retransmission timer of RLC expires. And meanwhile, recording the PDU carrying P1 when P is triggered each time. The record is cleared when a status report is received that requires the deletion of a previously recorded PDU. And after the polling retransmission timer is overtime, the recorded PDU is preferentially selected for retransmission. If the recorded PDU has been deleted, the PDU is selected in the transmitted queue according to the time length configured by the status report prohibit timer.
Disclosure of Invention
In view of the defects in the prior art, the present invention aims to provide a method, a system, a medium and a communication system thereof for dynamically determining a retransmission PDU.
The method for dynamically determining the PDU retransmission provided by the invention comprises the following steps:
step S1: determining the package content according to the size of the grant to package to obtain a TB package;
step S2: judging whether the current TB packet package meets the Polling 1 setting condition according to an 38.322 protocol, and adding a P bit to the PDU corresponding to the current TB packet package when the Polling 1 setting condition is met;
step S3: the sub RB records all SN numbers in the current TB group package, and simultaneously records the sectional information of the SN of the sections;
step S4: if the PollRetransmit timer is overtime due to the fact that the state packet of the opposite end is not received within the preset time, the condition that no new SDU or SDU segmentation is carried out is met;
step S5: and dynamically determining the size of the PDU to be retransmitted according to the size of the network authorization.
Preferably, the step S5 includes: when the authorization of the network is not received, triggering a SR/BSR process, when the BSR is reported, calculating a logical channel BO by using the last TB information with P bits, and determining the current authorization size according to the calculated logical channel BO; when receiving the authorization of the network, dynamically determining the size of the retransmitted PDU according to the size of the network authorization.
Preferably, the step S5 includes:
step S5.1: setting BO of a logical channel to be minimum to participate in calculation of an MAC token bucket algorithm;
step S5.2: the token bucket algorithm is calculated, and whether the current authorization has residual space capable of bearing more data content is judged; when the residual space exists, adding the recorded TB information from the last SN number one by one until the residual space is 0; and when no space is left, the data packet is directly sent to the network.
Preferably, the setting BO for the logical channel to minimum in the step S5.1 includes: the length of the RLC header according to the last SN number in the recorded TB information is added with a payload of a preset byte.
The system for dynamically determining the PDU retransmission provided by the invention comprises the following components:
module M1: determining the package content according to the size of the grant to package to obtain a TB package;
module M2: judging whether the current TB packet package meets the Polling 1 setting condition according to an 38.322 protocol, and adding a P bit to the PDU corresponding to the current TB packet package when the Polling 1 setting condition is met;
module M3: the sub RB records all SN numbers in the current TB group package, and simultaneously records the sectional information of the SN of the sections;
module M4: if the PollRetransmit timer is overtime due to the fact that the state packet of the opposite end is not received within the preset time, the condition that no new SDU or SDU segmentation is carried out is met;
module M5: and dynamically determining the size of the PDU to be retransmitted according to the size of the network authorization.
Preferably, said module M5 comprises: when the authorization of the network is not received, triggering a SR/BSR process, when the BSR is reported, calculating a logical channel BO by using the last TB information with P bits, and determining the current authorization size according to the calculated logical channel BO; when receiving the authorization of the network, dynamically determining the size of the retransmitted PDU according to the size of the network authorization.
Preferably, said module M5 comprises:
module M5.1: setting BO of a logical channel to be minimum to participate in calculation of an MAC token bucket algorithm;
module M5.2: the token bucket algorithm is calculated, and whether the current authorization has residual space capable of bearing more data content is judged; when the residual space exists, adding the recorded TB information from the last SN number one by one until the residual space is 0; and when no space is left, the data packet is directly sent to the network.
Preferably, the setting of BO of the logical channel to minimum in the module M5.1 includes: the length of the RLC header according to the last SN number in the recorded TB information is added with a payload of a preset byte.
According to the present invention, a computer-readable storage medium is provided, in which a computer program is stored, which, when being executed by a processor, carries out the steps of the method as described above.
The communication system provided by the invention comprises the system for dynamically determining the retransmission PDU.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention solves the problem that the size of the retransmission RLCPDU is not matched with the authorization, the PDU of a certain SN is not fixedly appointed to be retransmitted any more when PollRecransmit is overtime, but the retransmission range is appointed, and the number and the size of the retransmitted PDU are determined after the terminal receives the authorization; if the authorization is smaller and needs to be segmented, only a certain segment of the PDU is transmitted, and the complete PDU is not retransmitted any more, so that the retransmission times are reduced;
2. the invention solves the problem that when the authorization is larger, the retransmission PDU is selected, a certain SN is not selected randomly, the retransmission of the highest SN is not selected, and the selection method is based on the TB. This approach recognizes that the rlc pdu carrying the Polling Bit belongs to a TB, and then retransmits all the rlc pdus of all RBs of the entire TB. Since the TBs for data transmission are all bound to HARQ, if the peer does not respond to the polingbit, it is possible that the peer decodes the TB with CRC error, resulting in discarding the TB (and possibly also resulting from loss of status packet of the peer). The rlc PDUs of the same RB in the retransmission TB may not need to be retransmitted next time directly, so that the peer end receives all PDUs completely.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a diagram of a process of recording retransmission information and BSR;
fig. 2 is a flow chart of dynamically determining a retransmission PDU size.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
The method for dynamically determining the PDU retransmission provided by the invention comprises the following steps:
step S1: determining the package content according to the size of the grant to package to obtain a TB package;
step S2: judging whether the current TB packet package meets the Polling 1 setting condition according to an 38.322 protocol, and adding a P bit to the PDU corresponding to the current TB packet package when the Polling 1 setting condition is met;
step S3: the sub RB records all SN numbers in the current TB group package, and simultaneously records the sectional information of the SN of the sections;
step S4: if the PollRetransmit timer is overtime due to the fact that the state packet of the opposite end is not received within the preset time, the condition that no new SDU or SDU segmentation is carried out is met;
step S5: and dynamically determining the size of the PDU to be retransmitted according to the size of the network authorization.
Specifically, the step S5 includes: when the authorization of the network is not received, triggering a SR/BSR process, when the BSR is reported, calculating a logical channel BO by using the last TB information with P bits, and determining the current authorization size according to the calculated logical channel BO; when receiving the authorization of the network, dynamically determining the size of the retransmitted PDU according to the size of the network authorization.
Specifically, the step S5 includes:
step S5.1: setting BO of a logical channel to be minimum to participate in calculation of an MAC token bucket algorithm;
step S5.2: the token bucket algorithm is calculated, and whether the current authorization has residual space capable of bearing more data content is judged; when the residual space exists, adding the recorded TB information from the last SN number one by one until the residual space is 0; and when no space is left, the data packet is directly sent to the network.
Specifically, the setting of BO of the logical channel to minimum in the step S5.1 includes: the length of the RLC header according to the last SN number in the recorded TB information is added with a payload of a preset byte.
The system for dynamically determining the PDU retransmission provided by the invention comprises the following components:
module M1: determining the package content according to the size of the grant to package to obtain a TB package;
module M2: judging whether the current TB packet package meets the Polling 1 setting condition according to an 38.322 protocol, and adding a P bit to the PDU corresponding to the current TB packet package when the Polling 1 setting condition is met;
module M3: the sub RB records all SN numbers in the current TB group package, and simultaneously records the sectional information of the SN of the sections;
module M4: if the PollRetransmit timer is overtime due to the fact that the state packet of the opposite end is not received within the preset time, the condition that no new SDU or SDU segmentation is carried out is met;
module M5: and dynamically determining the size of the PDU to be retransmitted according to the size of the network authorization.
Specifically, the module M5 includes: when the authorization of the network is not received, triggering a SR/BSR process, when the BSR is reported, calculating a logical channel BO by using the last TB information with P bits, and determining the current authorization size according to the calculated logical channel BO; when receiving the authorization of the network, dynamically determining the size of the retransmitted PDU according to the size of the network authorization.
Specifically, the module M5 includes:
module M5.1: setting BO of a logical channel to be minimum to participate in calculation of an MAC token bucket algorithm;
module M5.2: the token bucket algorithm is calculated, and whether the current authorization has residual space capable of bearing more data content is judged; when the residual space exists, adding the recorded TB information from the last SN number one by one until the residual space is 0; and when no space is left, the data packet is directly sent to the network.
Specifically, the setting, in the module M5.1, the BO of the logical channel to be minimum includes: the length of the RLC header according to the last SN number in the recorded TB information is added with a payload of a preset byte.
According to the present invention, a computer-readable storage medium is provided, in which a computer program is stored, which, when being executed by a processor, carries out the steps of the method as described above.
The communication system provided by the invention comprises the system for dynamically determining the retransmission PDU.
Example 2
Example 2 is a preferred example of example 1
In view of the above-mentioned drawbacks in the prior art, the present invention provides a method for dynamically determining a retransmission PDU, and solves the technical problems that:
1) the retransmission RLCPDU size is not matched with the authorization, the PDU of a certain SN is not fixedly appointed to be retransmitted any more when PollRecransmit is overtime, but the retransmission range is appointed, and the number and the size of the retransmitted PDU are determined after the terminal receives the authorization. If the grant is smaller and requires fragmentation, only a certain segment of the PDU is transmitted, and the complete PDU is not retransmitted any more, thus reducing the number of retransmissions.
2) When the grant is large, the retransmission PDU is selected, not a certain SN is selected arbitrarily, or the retransmission of the highest SN is selected, but a selection method based on TB. This approach recognizes that the rlc pdu carrying the PollingBit belongs to a certain TB, and then retransmits all the rlc pdus of all the RBs of the entire TB. Since the TBs for data transmission are all bound to HARQ, if the peer does not respond to the polingbit, it is possible that the peer decodes the TB with CRC error, resulting in discarding the TB (and possibly also resulting from loss of status packet of the peer). The rlc PDUs of the same RB in the retransmission TB may not need to be retransmitted next time directly, so that the peer end receives all PDUs completely.
The invention provides a method for dynamically determining retransmission PDU, comprising: as shown in the figures 1-2 of the drawings,
step 1-1: and determining the packet content according to the grant size, and after the packet is formed, adding a P bit to the PDU meeting the condition of polling setting 1 according to a protocol.
Step 1-2: the rb records all SN numbers in the secondary packet (the TB) and also records fragment information of the SN of the fragment. These pieces of information are not necessarily used, and need to be deleted at the same time when rb is deleted, so as to avoid causing memory problems.
Step 1-3: the state packet of the opposite end cannot be received for a long time, so that the PollRecransmit timer is overtime, the condition that no new SDU or SDU segmentation exists is met, and PDU retransmission without ack can be specified arbitrarily in a protocol.
Step 1-4: if the network is not authorized and needs to trigger an SR/BSR process, the last TB information with p bits is used to calculate the logical channel BO if the BSR is reported.
Step 1-5: the received network grant dynamically determines the PDU size to be retransmitted based on the size of the network grant.
Step 1-5 can be further refined into processes 2-1, 2-2, 2-3 or 2-4.
Step 2-1: the BO of the logical channel is first set to the minimum size to participate in the calculation of the MAC token bucket algorithm. The minimum size is the RLC header length according to the last SN number in the TB information recorded in step 1-2 plus a Payload of 3 bytes.
Step 2-2: and (3) completing calculation of the token bucket algorithm, and judging whether the authorization has the residual space to bear more data content (the normal protocol flow is to directly add padding to enable the data sent at this time to meet the authorized TBSIZE).
Step 2-3: if there is remaining space, the TB information is added one by one from the last SN number until the remaining TBSIZE is 0 according to the TB information recorded in step 1-2.
Step 2-4: if there is no room left to send the packet directly to the network.
Example 3
Example 3 is a preferred example of example 1 and/or example 2
According to the fifth aspect, the present invention can be easily implemented. Two cases were simulated in the implementation:
with small network authorization, the scheme can complete a polling process by sending data of 7 bytes (including a mac header of 2 bytes + an rlc header of 2 bytes and a payload of 3 bytes).
The last TB with p is interfered and lost, the network inertia gives large authorization, the scheme can completely send the last TB to the network in the polling process, which is equivalent to the completion of the retransmission process of RLC incidentally, and reduces the time delay of the original process that the network sends the state packet UE and then sends the retransmission data according to the state packet.
Compared with the original scheme, the method can reduce the sending time of the air interface by 4 to 20 times, improve the utilization rate of the air interface and reduce the interference.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1) if the grant is small, fragmentation can be reduced, and only one time of PDU transmission completes the polling.
2) If the grant is larger, all data of the rb in the last TB can be sent to the network, so that the RLC at the network side has a higher probability of completing the composition of continuous data packets.
Under the scenario that no data can be sent when the poll transmit timer in the 5GRLC protocol times out, the protocol does not specifically indicate how to implement the procedure, and most of the implementation items use to select the SN closest to the upper edge of the transmission window in the PDUs which have not received ACKs and are already transmitted for retransmission, regardless of how large the grant is. Under the situation, the patent provides a method for dynamically determining PDU retransmission based on authorization size, under the condition of small authorization, the polling process is completed without segmentation, the retransmission times are reduced, under the condition of large authorization, all the RLC PDUs in the whole TB are retransmitted based on the recorded information of the last TB, and therefore one ARQ process is reduced roughly. This patent can improve the utilization ratio of empty port.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A method for dynamically determining retransmission of PDUs, comprising:
step S1: determining the package content according to the size of the grant to package to obtain a TB package;
step S2: judging whether the current TB packet package meets the Polling 1 setting condition according to an 38.322 protocol, and adding a P bit to the PDU corresponding to the current TB packet package when the Polling 1 setting condition is met;
step S3: the sub RB records all SN numbers in the current TB group package, and simultaneously records the sectional information of the SN of the sections;
step S4: if the PollRetransmit timer is overtime due to the fact that the state packet of the opposite end is not received within the preset time, the condition that no new SDU or SDU segmentation is carried out is met;
step S5: and dynamically determining the size of the PDU to be retransmitted according to the size of the network authorization.
2. The method for dynamically determining retransmission of PDUs according to claim 1, wherein said step S5 comprises: when the authorization of the network is not received, triggering a SR/BSR process, when the BSR is reported, calculating a logical channel BO by using the last TB information with P bits, and determining the current authorization size according to the calculated logical channel BO; when receiving the authorization of the network, dynamically determining the size of the retransmitted PDU according to the size of the network authorization.
3. The method for dynamically determining retransmission of PDUs according to claim 1, wherein said step S5 comprises:
step S5.1: setting BO of a logical channel to be minimum to participate in calculation of an MAC token bucket algorithm;
step S5.2: the token bucket algorithm is calculated, and whether the current authorization has residual space capable of bearing more data content is judged; when the residual space exists, adding the recorded TB information from the last SN number one by one until the residual space is 0; and when no space is left, the data packet is directly sent to the network.
4. The method according to claim 3, wherein the setting of BO of logical channel to minimum in step S5.1 comprises: the length of the RLC header according to the last SN number in the recorded TB information is added with a payload of a preset byte.
5. A system for dynamically determining retransmission PDUs, comprising:
module M1: determining the package content according to the size of the grant to package to obtain a TB package;
module M2: judging whether the current TB packet package meets the Polling 1 setting condition according to an 38.322 protocol, and adding a P bit to the PDU corresponding to the current TB packet package when the Polling 1 setting condition is met;
module M3: the sub RB records all SN numbers in the current TB group package, and simultaneously records the sectional information of the SN of the sections;
module M4: if the PollRetransmit timer is overtime due to the fact that the state packet of the opposite end is not received within the preset time, the condition that no new SDU or SDU segmentation is carried out is met;
module M5: and dynamically determining the size of the PDU to be retransmitted according to the size of the network authorization.
6. The system for dynamically determining retransmission PDUs according to claim 5, wherein said module M5 comprises: when the authorization of the network is not received, triggering a SR/BSR process, when the BSR is reported, calculating a logical channel BO by using the last TB information with P bits, and determining the current authorization size according to the calculated logical channel BO; when receiving the authorization of the network, dynamically determining the size of the retransmitted PDU according to the size of the network authorization.
7. The system for dynamically determining retransmission PDUs according to claim 5, wherein said module M5 comprises:
module M5.1: setting BO of a logical channel to be minimum to participate in calculation of an MAC token bucket algorithm;
module M5.2: the token bucket algorithm is calculated, and whether the current authorization has residual space capable of bearing more data content is judged; when the residual space exists, adding the recorded TB information from the last SN number one by one until the residual space is 0; and when no space is left, the data packet is directly sent to the network.
8. The system according to claim 7, wherein said module M5.1 for setting BO of logical channel to minimum includes: the length of the RLC header according to the last SN number in the recorded TB information is added with a payload of a preset byte.
9. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 4.
10. A communication system comprising a system for dynamically determining retransmission PDUs according to any of claims 5 to 8.
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| CN108809510A (en) * | 2017-05-05 | 2018-11-13 | 华为技术有限公司 | A kind for the treatment of method and apparatus of data transmission |
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Application publication date: 20210827 |