CN101986592A - Method for feeding back confirmation message - Google Patents

Method for feeding back confirmation message Download PDF

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Publication number
CN101986592A
CN101986592A CN2009100901435A CN200910090143A CN101986592A CN 101986592 A CN101986592 A CN 101986592A CN 2009100901435 A CN2009100901435 A CN 2009100901435A CN 200910090143 A CN200910090143 A CN 200910090143A CN 101986592 A CN101986592 A CN 101986592A
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arq
buffer memory
feedback
delay
jumping
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王立江
路杨
潘瑜
张莉莉
高伟东
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Potevio Institute of Technology Co Ltd
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Potevio Institute of Technology Co Ltd
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Abstract

The invention discloses a method for feeding back confirmation message, which is suitable for a communication system adopting a multi-hop ARQ (automatic retransmission request) mechanism. The method comprises the following steps of: when an ARQ receiving entity of each hop in the multi-hop ARQ mechanism feeds back the confirmation message to a corresponding ARQ transmitting entity, determining feedback time delay according to the buffer size of the ARQ transmitting entity of the next hop, delaying the time corresponding to the feedback time delay, and feeding back the confirmation message to the corresponding ARQ transmitting entity. The method can reduce the buffer overhead of relay equipment, reduce repeated data retransmission between the relay equipment and base station equipment and improve the utilization rate of system resources under the multi-hop ARQ mechanism.

Description

A kind of method of feedback acknowledgment message
Technical field
The present invention relates to wireless communication technology field, particularly a kind of method of feedback acknowledgment message.
Background technology
For the efficient of further raising system, and improve the network coverage, the LTE-Advanced standard that 3GPP is formulating has been introduced trunking.The relaying type of discussing comprises two kinds of Class1 (Type1) and types 2 (Type2).From the research of present 3GPP, the Type1 trunking becomes main flow.
In order to reduce influence to existing standard, and satisfy the needs of backward compatibility Release 8UE, clear and definite at present: two interfaces in the user plane of Type1 trunking: Un interface and Uu interface, all should comprise complete Radio Link control (RLC) agreement, thereby formed the rlc protocol structure of multi-hop, and then on Un interface and these two interfaces of Uu interface, all can carry out independently automatic repeat requests (ARQ) process.The ARQ protocol architecture of this multi-hop will cause following problem:
For the via node that is in a certain jumping (RN), when the wireless channel environment of its next-hop node worsens, because the upstream node of this RN can't be known the information that this wireless channel environment worsens, to continue to send data to this RN, and this RN can't successfully send to data downstream node, thereby cause the data of this RN to overstock, even buffer memory overflow.
Another even more serious problem is: because data in buffer all is that a last hop node is transmitted in the trunking, this trunking successfully receive certain user's data and upwards a hop node send confirm (ACK) message after, a last hop node will be deleted this user's data.If the user switches to a last hop node of this trunking from current trunking, that is to say, (Intra-DeNB_RN) that taken place between Donors eNB (DeNB) and the via node switches, this just need transmit data to the user by a last hop node, and do not had buffer memory this user's data in the last hop node this moment, need be returned to a last hop node by trunking this user's data with its buffer memory, then, hop node could send to these data this user on this.Said process will cause the waste of more interface-free resources, because this part data of passback from a last hop node (for example: the base station) be forwarded to trunking, and then return to the base station by trunking are actually.If relate to the above transfer of data of double bounce, each jumps the via node data in buffer must pass a hop node again back, and then sends to targeted sites (DeNB or RN), sends to UE afterwards.And in fact DeNB has received downlink data from strengthening core net (EPC, Enhanced Packet Core) the earliest, the data of commentaries on classics before only having deleted these need in switching after receiving the ACK of next-hop node.
There are two classes at present in solution to the problems described above: first kind method is to introduce ARQ mechanism end to end, only at packet final objective node after just UE receives packet, each intermediate node is just deleted the packet of this UE, and packet is buffered in each joint intermediate point always before this; Second class methods are to guarantee the few data of each jumping buffer memory by suitable algorithm as far as possible.
First kind method need be carried out bigger modification to prior protocols.For example: for LTE-Advanced, need revise completely, be agreement end to end by original every jumping protocol conversion for the rlc protocol of DeNB, RN and UE.From the discussion of present 3GPP, can not finish so huge modification in a short time, this does not meet the unanimity that 3GPP RAN2 has reached at the Type1 trunking yet.Because clear and definite at present: RN is to the Uu interface that between UE is exactly standard, comprises PDCP (PDCP), rlc protocol, medium access control (MAC) agreement and Radio Resource control (RRC) agreement identical with LTE Release 8; Therefore, only can be at the Un interface, just the interface between DeNB and RN carries out the modification of agreement.
In addition, next jumps a plurality of ARQ transmission this jumping ARQ transmission possibility correspondence, and the radio bearer (RB) that is similar to this jumping among the LTE can be mapped to next and jump on a plurality of RB.In fact, the data that UE receives not are the data that the first ARQ of jumping sending node is sent, and how to feed back and indicate ARQ end to end, need complicated signaling procedure.If the UE by the trunking access network switches, even change before certain a spot of data of some RB need in the final jump, also need the complicated algorithm design to make first the jumping change before sending node is known which corresponding packets need, this will cause system effectiveness to be a greater impact.
Now existing in second class methods is the Flow Control of carrying out each interface by the control signaling of dominance, to reach the purpose that reduces the defeated buffer memory of next jump set.But such method need be introduced extra signaling consumption, is example with 3GPP, and such change also is difficult to reach an agreement.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of feedback acknowledgment message, with under multi-hop ARQ mechanism, reduce trunking the buffer memory expense, reduce data passback repeatedly between trunking and the base station equipment, and improve usage factor of system resource.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of method of feedback acknowledgment message is applicable to the communication system that adopts the automatic request retransmission ARQ mechanism of multi-hop, comprising:
The ARQ receiving entity of each jumping in the described multi-hop ARQ mechanism is to its corresponding ARQ sending entity feedback acknowledgment message the time, buffer memory according to the ARQ sending entity of next jumping is determined delay of feedback, and after the described delay of feedback time corresponding of time-delay, to its corresponding ARQ sending entity feedback acknowledgment message.
The buffer memory of described ARQ sending entity according to next jumping determines that delay of feedback comprises:
A, obtain each next jump the buffer memory of ARQ sending entity, resulting buffer memory is added up;
B, according to T Prohibit=Γ * λ * F (B) calculates described delay of feedback, wherein:
T ProhibitBe described delay of feedback;
Γ is the fixed delay parameter that sets in advance, and Γ is the chronomere more than or equal to zero;
λ is the buffer memory correction coefficient that sets in advance, and the buffer memory size of ARQ sending entity that is used to adjust next jumping is for the influence degree of delay of feedback;
B be described with buffer memory add up adding up of obtaining and;
F (B) is for being the function of parameter with B.
Described a comprises: at each descending radio bearer, add up the buffer memory of pairing next the jumping radio bearer of described descending radio bearer, to add up corresponding to the buffer memory that next of each descending radio bearer jumped radio bearer, the buffer memory that next that obtains each descending radio bearer jumped the ARQ entity add up and.
As seen from the above technical solution, in the method for the feedback acknowledgment message that the present invention proposes, by at the ARQ of each jumping receiving entity to its corresponding ARQ sending entity feeding back ACK the time, determine delay of feedback according to next buffer memory B that jumps the ARQ sending entity earlier, and after time-delay delay of feedback time corresponding again to its corresponding ARQ sending entity feeding back ACK, thereby guarantee only to keep a spot of data in next buffer memory of jumping the ARQ sending entity, reduce the buffer memory expense of trunking, simultaneously, reduced between trunking and the base station equipment repeatedly data passback.
The present invention can effectively reduce Type1 trunking data in buffer amount in the LTE-Advanced system, forms the flow-control mechanism under the multi-hop rlc protocol structure, improves usage factor of system resource, and improves the performance that Intra-DeNB_RN switches.
Description of drawings
Fig. 1 is one three schematic diagram that jumps off row communication in the existing multi-hop wireless communication system;
Fig. 2 shows the shown in Figure 1 three ARQ schematic diagram of mechanism that jump off in the row communication;
Fig. 3 shows the mapping relations schematic diagram of protocol entity in the multi-hop ARQ agreement;
Fig. 4 is an ARQ schematic diagram of mechanism of the present invention;
Fig. 5 is for introducing trunking LTE-Advanced system configuration schematic diagram afterwards.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
In the middle of multi-hop wireless communication system, descending user data need could finally arrive the user through the forwarding of a plurality of nodes, and the transmission of each wave point is called as a jumping.Fig. 1 is one three schematic diagram that jumps off row communication in the existing multi-hop wireless communication system.Among Fig. 1, descending user data at first sends to first trunking RN1 by the base station, and this is first jumping; Send to RN2 by RN1 then, this is second jumping; Send to UE by RN2 at last, this is the 3rd jumping.
In descending multi-hop ARQ agreement, each is jumped communication and all has ARQ mechanism, but does not have ARQ agreement end to end.Fig. 2 shows the shown in Figure 1 three ARQ schematic diagram of mechanism that jump off in the row communication.Referring to Fig. 2:
Data shown in the figure (N) and Data (N+1) are certain user's downlink data unit, these data cells are sent since first transmitting terminal (base station as shown in Figure 1) of jumping, if first receiving terminal (RN1) of jumping is correctly received data then is fed back correct reception message ACK to transmitting terminal, indicate certain data cell correctly to receive, otherwise feedback error receives message NACK to transmitting terminal, and indication does not correctly receive this data cell.If transmitting terminal is received ACK, then delete corresponding data cell, otherwise resend the data cell of NACK correspondence.ACK and NACK quantity that the transmitting terminal of data cell is fed back in the unit interval according to the receiving terminal of data cell are adjusted the speed that sends data to the receiving terminal of data cell.Second transmitting terminal (RN1) of jumping adopts same mechanism to send data cell and adjust transmission rate to second receiving terminal (RN2) of jumping.
The ARQ protocol sender of each jumping sends the speed of data cell and can calculate according to (1) formula:
TX rate = α * F 1 ( N ACK T FC * W TX ) - - - ( 1 )
(1) in the formula, TX RateExpression does not need to confirm the data cell number that just can send continuously;
T FCExpression ARQ agreement is carried out the time span of the needed statistics of flow control ACK number;
N ACKBe illustrated in T FCThe number of the ACK that receives in time;
W TXSend window size for transmitting terminal;
Figure B2009100901435D0000052
For with T FC, N ACKAnd W TXBe the function of parameter, this function can be linear, also can be non-linear;
α is the parameter that system can join, and can be used for adjusting transmission rate and be subjected to the ACK effect.
Fig. 3 shows the mapping relations schematic diagram of protocol entity in the multi-hop ARQ agreement.Referring to Fig. 3, ARQ Rx represents the ARQ receiving entity, and ARQ Tx represents the ARQ sending entity, and it is right that the ARQ sending entity of each jumping and ARQ receiving entity are called as an ARQ entity.One or more ARQ entities that the right data of the ARQ entity of this jumping can be mapped to next jumping on, that is: the ARQ entity is to (N, i) data map arrives the ARQ entity to (N+1,0), the ARQ entity to (N+1,1) ..., the ARQ entity to (N+1, j) wait on, this means from the ARQ entity (N, i) data of sending will be assigned to several ARQ entities to (N+1,0)～(N+1 j) goes up transmission.
Each trunking is measured it, and next jumps the data to be transmitted of buffer memory.At J defeated ARQ sending entity of next jump set of trunking, definition buffer memory B, shown in (2) formula:
B = Σ j Buffer j - - - ( 2 )
(2) in the formula, Buffer jRepresent j ARQ sending entity data in buffer amount in next jumping, the span of j is 0～J-1; B represent next jump in data in buffer amount in all ARQ sending entities.Because working as the ARQ receiving entity of skip before in fact is exactly the ARQ sending entity of next jumping, therefore, adding up its next jumping ARQ sending entity data in buffer amount when the ARQ of skip before receiving entity in fact is exactly to add up himself data in buffer amount.According to the description of front, these data volumes should maintain state seldom, avoiding when switching, and transferring large number of data repeatedly on some relevant interfaces.
The present invention proposes the method for feedback acknowledgment message in the descending ARQ mechanism of a kind of multi-hop relay on the basis of the descending ARQ agreement of above-mentioned existing multi-hop.In method provided by the present invention, the speed that the ARQ sending entity of each jumping sends data cell still satisfies (1) formula, but, the ARQ receiving entity of each jumping is to its corresponding ARQ sending entity feeding back ACK the time, determine delay of feedback according to next buffer memory B that jumps the ARQ sending entity earlier, and after time-delay delay of feedback time corresponding again to its corresponding ARQ sending entity feeding back ACK, thereby guarantee only to keep a spot of data in next buffer memory of jumping the ARQ sending entity, reduce the buffer memory expense of trunking, simultaneously, reduced between trunking and the base station equipment repeatedly data passback.
Fig. 4 is an ARQ schematic diagram of mechanism of the present invention.Fig. 4 has introduced time-delay T on the basis of ARQ mechanism shown in Figure 2 Prohibit, the ARQ receiving entity is after correct receiving data units, and T delays time ProhibitAgain to ARQ sending entity feeding back ACK.
The delay of feedback that the present invention introduces can calculate according to (3) formula:
T Prohibit＝Γ*λ*F(B) (3)
(3) in the formula, Γ is the fixed delay parameter that sets in advance, for more than or equal to zero chronomere;
λ is the buffer memory correction coefficient that sets in advance, and the buffer memory size of ARQ sending entity that is used to adjust next jumping is for the influence degree of delay of feedback;
B for buffer memory is added up adding up of obtaining and, shown in (2) formula;
F (B) is for being the function of parameter with B, and this function can be a linear function, also can be nonlinear function.
Like this by adjusting relevant parameter, with the transmission rate dominance of next buffer memory of jumping the ARQ sending entity and the ARQ sending entity of a last jumping connect, guaranteed to jump a spot of data of buffer memory in the descending ARQ sending entity in the trunking, thereby in handoff procedure, avoided expense that the descending data that have been sent to trunking are returned again at each.
Be example with the LTE-Advanced system below, the present invention is further elaborated.
In present 3GPP agreement, the ARQ agreement realizes that in RLC rlc protocol comprises: AM mode data transmission ARQ, segmentation and serial connection, submit according to the order of sequence, duplicate detection and the Flow Control function finished by windowing mechanism.Therefore, in the LTE-Advanced system, the time-delay feedback method in the descending ARQ mechanism of multi-hop relay is realized in rlc layer.In system, the corresponding RB of each rlc protocol entity, and after introducing trunking, on the down direction, the RB of previous dive link may be mapped to next and jump on a plurality of RB, in order to improve resource utilization.As shown in Figure 5, the RB on the corresponding a plurality of Uu interfaces of the RB on the Un interface.
Because have above-mentioned corresponding relation between the RB of Un interface and Uu interface, on RN, the measurement of RLC buffer memory need be added up the transmission buffer memory of the pairing RLC entity of a plurality of descending RB.
Particularly, in RN, have a plurality of descending RB, at the defeated RLC receiving entity that has a plurality of correspondences simultaneously of a last jump set, each RLC receiving entity can correspond to next and jump a plurality of RLC sending entities (corresponding a plurality of next jump a plurality of descending RB).That is: at each descending radio bearer RB (i), statistic B RB (i)The RLC of J RB of corresponding next jumping sends buffer memory Buffer jThat is:
B RB ( i ) = Σ j Buffer j - - - ( 4 )
This statistic influences the window width of RN as receiving terminal the most at last, the send window width of the rlc protocol that influence just last is jumped.
For fear of feedback implosion, promptly receiving terminal sends to transmitting terminal with too much feedback information, and waste system resource is provided with timer T_status_prohibit (referring to 3GPPTS36.322) in rlc protocol.Before timer T_status_prohibit was overtime, the receiving terminal of RLC not condition report feedback (this status report comprises NACK and ACK) arrived transmitting terminal.After the present invention, the timing of this timer equals:
T_status_prohibit＝T*λ*F2[B RB(i)] (5)
T when not adopting this algorithm, system O﹠amp; The length of the T_status_prohibit of M configuration;
λ is the buffer memory correction coefficient that sets in advance, and the buffer memory size of ARQ sending entity that is used to adjust next jumping is for the influence degree of delay of feedback.
F2[B RB (i)] be being used for of setting in advance to B RB (i)Carry out remaking the function that is used for T_status_prohibit after certain conversion.
As seen from the above-described embodiment, in the method for the feedback acknowledgment message that the present invention proposes, by at the ARQ of each jumping receiving entity to its corresponding ARQ sending entity feeding back ACK the time, determine delay of feedback according to next buffer memory B that jumps the ARQ sending entity earlier, and after time-delay delay of feedback time corresponding again to its corresponding ARQ sending entity feeding back ACK, thereby guarantee only to keep a spot of data in next buffer memory of jumping the ARQ sending entity, reduce the buffer memory expense of trunking, simultaneously, reduced between trunking and the base station equipment repeatedly data passback.
In order to reduce influence as far as possible to existing protocol, the present invention is by the mode of time-delay feedback, introduced the associating feedback mechanism of multi-hop link effectively, reasonably controlled the data volume of down buffer storage in the trunking, reduce the down buffer storage expense of trunking on the one hand, reduced the repeatedly transmission of downlink data on the Un interface when switching on the other hand.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. the method for a feedback acknowledgment message is applicable to the communication system that adopts the automatic request retransmission ARQ mechanism of multi-hop, it is characterized in that, comprising:
The ARQ receiving entity of each jumping in the described multi-hop ARQ mechanism is to its corresponding ARQ sending entity feedback acknowledgment message the time, buffer memory according to the ARQ sending entity of next jumping is determined delay of feedback, and after the described delay of feedback time corresponding of time-delay, to its corresponding ARQ sending entity feedback acknowledgment message.
2. method according to claim 1 is characterized in that, the buffer memory of described ARQ sending entity according to next jumping determines that delay of feedback comprises:
A, obtain each next jump the buffer memory of ARQ sending entity, resulting buffer memory is added up;
B, according to T Prohibit=Γ * λ * F (B) calculates described delay of feedback, wherein:
T ProhibitBe described delay of feedback;
Γ is the fixed delay parameter that sets in advance, and Γ is the chronomere more than or equal to zero;
λ is the buffer memory correction coefficient that sets in advance, and the buffer memory size of ARQ sending entity that is used to adjust next jumping is for the influence degree of delay of feedback;
B be described with buffer memory add up adding up of obtaining and;
F (B) is for being the function of parameter with B.
3. method according to claim 2 is characterized in that, described a comprises:
At each descending radio bearer, add up the buffer memory of pairing next the jumping radio bearer of described descending radio bearer, to add up corresponding to the buffer memory that next of each descending radio bearer jumped radio bearer, the buffer memory that next that obtains each descending radio bearer jumped the ARQ entity add up and.
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
WO2020032129A1 (en) * 2018-08-08 2020-02-13 京セラ株式会社 Relay device
CN110831095A (en) * 2018-08-11 2020-02-21 华为技术有限公司 Communication method and communication device
CN111586803A (en) * 2019-02-15 2020-08-25 华为技术有限公司 Communication method and related equipment

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020032129A1 (en) * 2018-08-08 2020-02-13 京セラ株式会社 Relay device
JPWO2020032129A1 (en) * 2018-08-08 2021-08-26 京セラ株式会社 Relay device
JP7189219B2 (en) 2018-08-08 2022-12-13 京セラ株式会社 repeater
US11949490B2 (en) 2018-08-08 2024-04-02 Kyocera Corporation Relay apparatus
CN110831095A (en) * 2018-08-11 2020-02-21 华为技术有限公司 Communication method and communication device
CN110831095B (en) * 2018-08-11 2021-11-19 华为技术有限公司 Communication method and communication device
CN111586803A (en) * 2019-02-15 2020-08-25 华为技术有限公司 Communication method and related equipment
CN111586803B (en) * 2019-02-15 2021-09-07 华为技术有限公司 Communication method and related equipment

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Application publication date: 20110316