CN110495211A - Device and its buffer control method in wireless communication system - Google Patents

Abstract

It provides a kind of for supporting the 5G communication system or pre- 5G communication system of data rate more higher than the data rate of the super 4G communication system of such as LTE.A method of for controlling buffer by device in a wireless communication system, including information relevant to grouping is stored at least one of the first buffer or the second buffer, it sends the data that generate based on grouping, and when for data receiver to confirmation signal, abandons the information.

Description

Device and its buffer control method in wireless communication system

Technical field

This disclosure relates to the operation of terminal and base station in next generation mobile communication system, more specifically, this disclosure relates to A method of efficiently managing buffer for terminal and base station, and a kind of method that can accelerate to retransmit during re-transmission and Device.

Background technique

It the needs of increased wireless data service, has been had made efforts to out to meet to since the deployment of 4G communication system Send out 5G or pre- 5G communication system improved.Therefore, 5G or pre- 5G communication system are also referred to as " super 4G network " or " rear LTE system System ".

5G communication system, which is taken into account in higher frequency (millimeter wave) frequency band of such as 60GHz frequency band, to be implemented, to realize Higher data rate.In order to reduce the propagation loss of radio wave and increase transmission range, discussed in 5G communication system Beam forming, extensive multiple-input and multiple-output (Multiple-Input Multiple-Output, MIMO), full dimension multi input are more Export (Full Dimensional MIMO, FD-MIMO), array antenna, analog beam forming, large-scale antenna technology.

In addition, being based on advanced small cell, cloud radio access network (Radio Access in 5G communication system Network, RAN), super-intensive network, device-to-device (Device-to-Device, D2D) communication, wireless backhaul, mobile network Network, collaboration communication, coordinating multiple points (Coordinated Multi-Points, CoMP), receiving end interference cancellation etc. are carried out to being The exploitation of system network improvement.

In 5G system, develops and modulated (Advanced Coding Modulation, ACM) as advanced encoder Mixing FSK and QAM modulation (FQAM) and sliding window supercomposed coding (Sliding Window Superposition Coding, SWSC) and as advanced access technology filter bank multi-carrier (Filter Bank Multi Carrier, FBMC), non-orthogonal multiple (Non-Orthogonal Multiple Access, NOMA) and Sparse Code multiple access (Sparse Code Multiple Access, SCMA).On the other hand, in next generation mobile communication system, a kind of base station that is used for is needed efficiently to manage Manage the method and a kind of method that can speed up re-transmission of buffer.

Above- mentioned information are only used as background information to present, to help to understand the disclosure.Whether any of above information can be answered With for the prior art about the disclosure, does not make a determination, also do not make and asserting.

Summary of the invention

Technical problem

All aspects of this disclosure at least provide following advantages at least to solve the above problems and/or disadvantage.Cause This, the one side of the disclosure is to provide a kind of method for efficiently managing buffer and its in different buffer structures Embodiment method.In addition, the present disclosure proposes for accelerating to retransmit in next generation mobile communication system and efficiently manage slow Rush the method and its embodiment method in different buffer structures of device.

Issue-resolution

According to the one side of the disclosure, it provides a kind of in a wireless communication system by the side of device control buffer Method.This method comprises: information relevant to grouping is stored at least one of the first buffer or the second buffer；Hair Send the data generated based on grouping；And when for data receiver to confirmation signal, abandon the information.

According to another aspect of the present disclosure, it provides a kind of in a wireless communication system by device control buffer Method.This method comprises: the first information relevant to the first grouping is stored in third buffer；It will be related to second packet The second information be stored in the 4th buffer, wherein the second information by obtain for sends first be grouped resource information Pretreatment first is grouped and generates before；It identifies between the location information of third buffer and the location information of the 4th buffer Map information；And when receiving resource information, data corresponding with second packet are sent based on resource information.

According to another aspect of the present disclosure, the device in a kind of wireless communication system is provided.The device includes transceiver With at least one processor, which is configured as: information relevant to grouping is stored in the first buffer Or second at least one of buffer；Send the data generated based on grouping；And when for data receiver to confirmation When signal, the information is abandoned.

According to another aspect of the present disclosure, the device in a kind of wireless communication system is provided.The device includes transceiver With at least one processor, which is configured as: the first information relevant to the first grouping is stored in In three buffers；Second information is stored in the 4th buffer, the second information is grouped with by being used to send first in acquisition Resource information before pre-process the first grouping and the second packet that generates is related；Identify the location information and the of third buffer Map information between the location information of four buffers；And when receiving resource information, sent based on resource information with The corresponding data of second packet.

Advantageous effect of the invention

In accordance with an embodiment of the present disclosure, the efficiency of the buffer management of terminal can be improved and increase data rate.

From the various embodiments that the disclosure is disclosed in conjunction with attached drawing it is described in detail below in, the disclosure other aspect, Advantage and notable feature will become obvious those skilled in the art.

Detailed description of the invention

In the following description which refers to the attached drawing, the above and other aspects, features and advantages of some embodiments of the disclosure It will become apparent, in which:

Fig. 1 is to show long term evolution according to an embodiment of the present disclosure (Long Term Evolution, LTE) system Structure diagram；

Fig. 2 is to show the diagram of the radio protocol structure of LTE system according to an embodiment of the present disclosure；

Fig. 3 is to show the diagram of the structure of next generation mobile communication system according to an embodiment of the present disclosure；

Fig. 4 is to show the radio protocol structure of next generation mobile communication system according to an embodiment of the present disclosure to show Figure；

Fig. 5 A and Fig. 5 B are to show the diagram of the data processing structure in LTE system according to an embodiment of the present disclosure；

Fig. 6 is to show LTE system terminal according to an embodiment of the present disclosure of working as in radio link control (Radio Link Control, RLC) efficient buffer management applicable when operating under affirmation mode (Acknowledged Mode, AM) The diagram of the first embodiment of method；

Fig. 7 is to show the height according to an embodiment of the present disclosure when operating under RLC AM mode when LTE system terminal The mapping table of the buffer management method of effect and the diagram of respective operations；

Fig. 8 A and Fig. 8 B are to show wherein LTE system terminal according to an embodiment of the present disclosure in RLC AM mode down tube The diagram of operation that manage buffer, terminal；

Fig. 9 A and Fig. 9 B are to show wherein LTE system terminal according to an embodiment of the present disclosure in RLC unacknowledged mode The diagram of buffer, terminal operation is managed under (Unacknowledged Mode, UM)；

Figure 10 A and Figure 10 B are to show wherein LTE system terminal according to an embodiment of the present disclosure under RLC AM mode The diagram of operation that manage buffer, terminal；

Figure 11 A and Figure 11 B are to show wherein LTE system terminal according to an embodiment of the present disclosure under RLC UM mode The diagram of operation that manage buffer, terminal；

Figure 12 is to show according to an embodiment of the present disclosure to be applicable in when operating under RLC AM mode when LTE system terminal Mapping table and buffer management method diagram；

Figure 13 A and Figure 13 B are to show wherein LTE system terminal according to an embodiment of the present disclosure under RLC AM mode The diagram of operation that manage buffer, terminal；

Figure 14 A and Figure 14 B are to show wherein LTE system terminal according to an embodiment of the present disclosure under RLC UM mode The diagram of operation that manage buffer, terminal；

Figure 15 A and Figure 15 B are at the data shown in next generation mobile communication system according to an embodiment of the present disclosure Manage the diagram of structure；

Figure 16 be show in accordance with an embodiment of the present disclosure and propose when next-generation mobile communication system terminal is in RLC The diagram of applicable mapping table and re-transmission accelerated method when being operated under AM mode；

Figure 17 A and Figure 17 B are to show wherein next generation mobile communication system terminal according to an embodiment of the present disclosure to exist The diagram of buffer, terminal operation is managed under RLC AM mode；

Figure 18 A and Figure 18 B are to show wherein next generation mobile communication system terminal according to an embodiment of the present disclosure to exist The diagram of buffer, terminal operation is managed under RLC UM mode；

Figure 19 is the block diagram of terminal according to an embodiment of the present disclosure；

Figure 20 is to send and receive point (Transmission in wireless communication system according to an embodiment of the present disclosure And Reception Point, TRP) block diagram；And

Figure 21 is to show the method according to an embodiment of the present disclosure for pre-processing the data of multi-connection terminal to show Figure.

Throughout the drawings, it should be noted that similar appended drawing reference is used to describe same or similar element, feature and structure.

Specific embodiment

The disclosure being described below to help comprehensive understanding to be defined by the claims and their equivalents for referring to attached drawing is provided Various embodiments.It includes various specific details to help to understand, but these are only taken as being exemplary.Therefore, originally Field skilled artisan will realize that, do not depart from the scope of the present disclosure and spirit in the case where, can be to described herein Various embodiments make various changes and modifications.In addition, for clarity and conciseness, it is convenient to omit to well-known function With the description of structure.

The term and word used in the following description and claims is not limited to dictionary meanings, but is only used by inventor To make it possible to clear and consistently understand the disclosure.Therefore, it will be apparent to one skilled in the art that providing this public affairs Being described below for the various embodiments opened is merely to illustrate that purpose, rather than in order to limit by appended claims and its wait The purpose for the disclosure that jljl limits.

It will be understood that singular " one " and "the" include plural object, unless context clearly dictates otherwise.Therefore, For example, including the reference to one or more of such surface to the reference of " assembly surface ".

When describing the disclosure, determining the relevant well-known function being incorporated herein or configuration unnecessary thin In the case where the theme for having obscured the disclosure in section, it is not described in detail the function or configuration.Hereinafter, this will be described with reference to the drawings Disclosed embodiment.

Hereinafter, for the ease of explaining, have been illustrated as described below used in connecting node for identification Term, the term for calling network entity, the term for calling message, the art for calling the interface between network entity Language and term for calling various identification informations.Therefore, it the present disclosure is not limited to later by the term of description, but can be used For calling other terms of the object with equivalent technology meaning.

Hereinafter, for the ease of explaining, having been used in the disclosure in third generation partner program long term evolution (LTE) term and title defined in standard.However, the disclosure is not limited by the term and title, but can comparably answer System for following other standards.

In next generation mobile communication system, it is necessary to support the peak data rate and uplink of 20Gbps in downlink The peak data rate of 10Gbps in link, and need extremely short Latency response time.Therefore, in next generation mobile communication In system in the case where service terminal, quite high transmission/reception data processing speed is necessary.Therefore, for accelerating end The method of the data processing at end is important.In addition, in order to support high data rate and accelerate data processing speed, it is efficient slow Device management is rushed also to be important.In mobile communication system, substantially reduce the maximum reason of data rate first is that due to retransmitting Caused time delay.Therefore, in order to support the high data rate in next generation mobile communication system, it is necessary to accelerate to retransmit.

LTE system has the data processing structure of the data processing structure different from next generation mobile communication system.Specifically Ground, in LTE system, radio link controls (RLC) layer and executes RLC cascade function, therefore terminal cannot execute some data Pretreatment, until it receives uplink transmission resource from network.If receiving uplink transmission sources, terminal passes through The PDCP packet data sent from Packet Data Convergence Protocol (Packet Data Convergence Protocol, PDCP) layer The cascade of unit (Packet Data Unit, PDU) generates a RLC PDU and sends it to media access control (Media Access Control, MAC) layer, to continue data transmission.

On the contrary, rlc layer does not have RLC cascade function, therefore terminal has a data in next generation mobile communication system Processing structure, wherein the data processing structure can be by being handled before receiving uplink transmission resource by rlc layer The PDCP PDU sent from PDCP layers to generate RLC PDU and sends it to MAC layer, and pre-generatmg MAC sub-header and MAC Service data unit (Service Data Unit, SDU).

Therefore, it is necessary to according to different data processing structures in a variety of ways come implement for efficiently manage buffer Method and for accelerate retransmit method.

Fig. 1 is to show the diagram of the structure of LTE system according to an embodiment of the present disclosure.

With reference to Fig. 1, as shown, the radio access network (RAN) of LTE system by enode (evolved node, ENB) 105,110,115 and 120 (also referred to as base stations), mobility management entity (Mobility Management Entity, MME) 125 and gateway (Serving-GateWay, S-GW) 130 form.Terminal or user equipment (User Equipment, UE) 35 external network is accessed by ENB 105 to 120 and S-GW 130.

In Fig. 1, ENB 105 to 120 corresponds to UMTS (Universal Mobile Telecommunications System, Universal Mobile Communication System) existing node B.ENB is connected to UE 135 over a radio channel, and plays the part of ratio Existing node B more complicated role.In LTE system, since all customer services include such as servicing on a shared channel Pass through the voice (voice over internet protocol, VoIP) of Internet protocol (Internet Protocol, IP) Real time service, so passing through the shape of the buffer state, available transmission power state and channel status that merge such as each UE State information is necessary come the equipment for executing scheduling, and ENB 105 to 120 corresponds to such controlling equipment.In general, one ENB controls multiple cells.For example, in order to implement the transmission speed of 100Mbps, LTE system is used in such as 20MHz bandwidth just Frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) is handed over to be electrically accessed skill as wireless Art.In addition, LTE system use determine modulation scheme and channel encoding rate with the Adaptive Modulation of the channel status of reflexless terminal and (Adaptive Modulation&Coding, the AMC) scheme of coding.S-GW 130 provides Deta bearer, and MME's 125 Control is lower to generate or removes Deta bearer.The mobile management of MME controlling terminal and various control functions, and be connected to multiple Base station.

Fig. 2 is to show the diagram of the radio protocol structure of LTE system according to an embodiment of the present disclosure.

With reference to Fig. 2, in UE or ENB, the radio protocol of LTE system by PDCP 205 or 240, RLC 210 or 235 with And MAC 215 or 230 is formed.The responsible IP header compress contracting operation of PDCP 205 or 240.The major function of PDCP is summarized It is as follows.

Header-compressed and decompression: only robust header compression (RObust Header Compression, ROHC)

The transmitting of user data

It was rebuild in the PDCP of radio resource control (Radio Resource Control, RRC) affirmation mode (AM) The order delivery of upper layer PDU in journey

For the separation carrying (only supporting RLC AM) in dual link (Dual Connectivity, DC): for sending PDCP PDU routing and for received PDCP PDU resequence

The repetition of lower layer SDU in the PDCP reconstruction process of RLC AM detects

For the separation carrying in DC, the re-transmission of PDCP SDU in switching, and for RLC AM, in PDCP data The re-transmission of PDCP PDU in recovery process

Encryption and decryption

The SDU based on timer in uplink is abandoned

RLC 210 or 235 reconfigures PDCP PDU of a size suitable, and executes automatic repeat request (Automatic Repeat Request, ARQ) operation etc..The major function of RLC is summarized as follows.

The transmitting of upper layer PDU

Pass through the error correction (being only used for the transmitting of AM data) of ARQ

Cascade, the Segmentation and Reassembly (being only used for the transmitting of UM and AM data) of-RLC SDU

The segmentation again (being only used for the transmitting of UM and AM data) of-RLC data PDU

The rearrangement (being only used for the transmitting of UM and AM data) of-RLC data PDU

Repeat detection (being only used for the transmitting of UM and AM data)

Protocol error detection (is only used for the transmitting of AM data)

- RLC SDU is abandoned and (is only used for UM and AM transmitting)

- RLC is rebuild

MAC 215 or 230 is connected to the several rlc layer equipment configured in a terminal, and executes and answer RLC PDU RLC PDU is demultiplexed from MAC PDU with for MAC PDU/.The major function of MAC is summarized as follows.

Mapping between logic channel and transmission channel

The MAC SDU for belonging to one or Different Logic channel is multiplexed on transport channels to/from physical layer transmitting Transmission block (Transport Block, TB)/from the TB demultiplexes the MAC SDU

Scheduling information report

Mixed automatic repeat request (Hybrid Automatic Repeat Request, HARQ) function (passes through HARQ Error correction)

Priority processing between the logic channel of-one UE

Pass through the priority processing of dynamic dispatching between-UE

Multicast broadcast multimedia service (Multimedia Broadcast Multicast Service, MBMS) service Mark

Transformat selection

Filling

Physical layer 220 or 225 executes the Channel Coding and Modulation of upper layer data, to configure OFDM symbol and send it to Radio channel, or the demodulation channel decoding of the OFDM symbol received over a radio channel is executed, by demodulation The decoded data of channel are transmitted to upper layer.

Fig. 3 is to show the diagram of the structure of next generation mobile communication system according to an embodiment of the present disclosure.

With reference to Fig. 3, as shown, the RAN of next generation mobile communication system (NR or 5G) is by new radio node B (new Radio node B, NR gNB or NR ENB) 310 and new radio core net (new radio core network, NR CN) 305 composition.New radio user equipment (NR UE or terminal) 315 is accessed outer by NR gNB 310 and NR CN 305 Portion's network.

In Fig. 3, NR gNB 310 corresponds to the ENB of existing LTE system.NR gNB is connected to NR over a radio channel UE 315, therefore it can provide the more superior service of service than existing node B.Due in next generation mobile communication system All customer services are serviced on a shared channel, so passing through the buffer state of such as each UE of merging, available transmission power State and the status information of channel status are necessary come the equipment for executing scheduling, and NR gNB 310 is responsible for this point.One A NR gNB usually controls multiple cells.In order to implement the very high-speed data transfer compared with existing LTE, NR gNB or cell can With with existing maximum bandwidth or bigger bandwidth, and in view of OFDM is as wireless connection technology, wave can be also comprised Beam shaping technology.In addition, using the AMC scheme for determining modulation scheme and channel encoding rate to match the channel status of UE.

NR CN 305 executes mobility support, carrying configuration and service quality (Quality Of Service, QoS) and matches The function of setting.NR CN is responsible for terminal mobility management and various control functions, and is connected to multiple ENB.In addition, Next generation mobile communication system can be additionally configured to communicate in region 320 with existing LTE system, and NR CN passes through net Network interface is connected to MME 325.MME is connected to the ENB 330 as existing base station.

Fig. 4 is to show the radio protocol structure of next generation mobile communication system according to an embodiment of the present disclosure to show Figure.

With reference to Fig. 4, in UE or NR ENB, the radio protocol of next generation mobile communication system by NR PDCP 405 or 440, NR RLC 410 or 435 and NR MAC 415 or 430 is formed.The major function of NR PDCP 405 or 440 may include Part in following functions.

Header-compressed and decompression: only ROHC

The transmitting of user data

The order delivery of upper layer PDU

It resequences for received PDCP PDU

The repetition of lower layer SDU detects

The re-transmission of-PDCP SDU

Encryption and decryption

The SDU based on timer in uplink is abandoned

As described above, may mean that the rearrangement of NR PDCP equipment based on PDCP sequence number (Sequence Number, SN) it resequences to from the received PDCP PDU of lower layer.Rearrangement may include according to the suitable of rearrangement Sequence delivers the data to upper layer, the PDCP PDU lost by rearrangement record, to the PDCP for loss of sending side The state report of PDU, and the retransmission request of the PDCP PDU to loss.

The major function of NR RLC 410 or 435 may include the part in following functions.

The transmitting of upper layer PDU

The order delivery of upper layer PDU

The out-of-sequence delivering of upper layer PDU

Pass through the error correction of ARQ

Cascade, the Segmentation and Reassembly of-RLC SDU

The segmentation again of-RLC data PDU

The rearrangement of-RLC data PDU

It repeats to detect

Protocol error detection

- RLC SDU is abandoned

- RLC is rebuild

As described above, may mean that will be from the received RLC SDU order delivery of lower layer for the order delivery of RLC NR equipment To upper layer.In the case where a RLC SDU is segmented into several RLC SDU to be received, NR RLC equipment is sequentially passed Send may include RLC SDU recombination and delivering.In addition, the order delivery of NR RLC equipment may include based on RLC SN or PDCP SN resequences to RLC PDU, the RLC PDU lost by rearrangement record, execute to sending side for The state report of the RLC PDU of loss, and the retransmission request of the PDCP PDU to loss.In addition, NR RLC equipment is sequentially Delivering may include: the RLC SDU if there is loss, then only by the RLC SDU just before the RLC SDU of loss sequentially It is delivered to upper layer；If despite the presence of the RLC SDU of loss, but specific timer is expired, then it will start it in timer All RLC SDU order deliveries for receiving are to upper layer before operation；Or the RLC SDU despite the presence of loss, but if fixed When device it is expired, then by all RLC SDU order deliveries up to the present received to upper layer.In addition, NR rlc layer can To handle RLC PDU according to the received sequence of RLC PDU (regardless of the sequence of sequence number, the sequence reached according to them), and RLC PDU can be transmitted to PDCP equipment in a manner of out-of-sequence delivering.In the case where grouping is segmented, it is stored in buffer In or segmentation to be received later be received and be redeployed as one to be processed and being transmitted to PDCP equipment it is complete RLC PDU.NR rlc layer can not include cascade function, and the function can be executed by NR MAC layer, or can be by The multiplexing function of NR MAC layer replaces.

As described above, mean will be from the received RLC of lower layer in a manner of out-of-sequence delivering for the out-of-sequence delivering of NR RLC equipment SDU is directly delivered to the function on upper layer.If a RLC SDU is segmented into several RLC SDU to be received, out-of-sequence delivering It may include the recombination of RLC SDU and delivering and recorded by RLC SN or the PDCP SN for the RLC PDU that stores and sort The RLC SDU of loss.

NR MAC 415 or 430 may be coupled to the several NR rlc layer equipment configured in a terminal, and NR The major function of MAC may include the part in following functions.

Mapping between logic channel and transmission channel

The multiplex/demultiplex of-MAC SDU

Scheduling information report

HARQ function (passes through the error correction of HARQ)

Priority processing between the logic channel of-one UE

Pass through the priority processing of dynamic dispatching between-UE

MBMS service mark

Transformat selection

Filling

NR physical layer 420 or 425 can execute the Channel Coding and Modulation of upper layer data, with configure OFDM symbol and by its It is sent to radio channel, or the demodulation channel decoding of the OFDM symbol received over a radio channel can be executed, The decoded data of demodulation channel are transmitted to upper layer.

Fig. 5 A and Fig. 5 B are to show the diagram of the data processing structure in LTE system according to an embodiment of the present disclosure.

With reference to Fig. 5 A and Fig. 5 B, LTE system executes PDCP layers and rlc layer data processing for logic channel.That is, Logic channel 1 505 and logic channel 2 510 have different PDCP layer and rlc layer, and execute independent data processing.This Outside, the RLC PDU generated from the rlc layer of each logic channel is transmitted to MAC layer by LTE system, to configure a MAC PDU, And receiving end is sent by MAC PDU.In LTE system, PDCP layers, rlc layer and MAC layer may include above with reference to Fig. 2 The function, and operation corresponding with the function can be executed.

In LTE system, rlc layer can cascade PDCP PDU.In addition, in LTE system, by 525 table of appended drawing reference In the PDCP PDU structure shown, all MAC sub-headers are located at the front of MAC PDU, and the part MAC SDU is located at MAC PDU's Rear portion.Due to features described above, in LTE system, before terminal receives uplink grant, rlc layer be unable to pre-execution or Prepare data processing.

As fig. 5 a and fig. 5b, if receiving uplink grant 530, terminal is received by cascade from PDCP layers PDCP PDU generate RLC PDU to match uplink grant.Uplink grant is received from base station in MAC layer 520 Later, terminal logical channels are prioritized (Logical Channel Prioritization, LCP), and for each Logic channel divides uplink grant.That is, uplink grant 530 is to distribute to the uplink of MAC layer 520 from base station Link transmission resource.If the size for the PDCP PDU to be cascaded and the size of uplink grant mismatch, rlc layer 515 execute fragmentation procedure, so that PDCP PDU matches uplink grant.Terminal can execute above-mentioned for each logic channel Process, and cascade PDCP PDU can be used to configure RLC header in each RLC equipment, and can be by the RLC of completion PDU is sent to MAC equipment.

As described above, MAC equipment can will be configured to a MAC from the received RLC PDU of each rlc layer (MAC SDU) MAC PDU is sent physical equipment by PDU.If RLC equipment executes staged operation and will during the configuration of RLC header Segment information is included in RLC header, it is likely that the length information of each cascade PDCP PDU is included (this in the header It is to recombinate them at receiving end).

As described above, LTE system is characterized in that, so that the comprehensive data processing of rlc layer, MAC layer and physical layer is from connecing The time for receiving uplink grant starts.

In LTE system, rlc layer can be in RLC AM, RLC unacknowledged mode (UM) and RLC transparent mode It is operated under (Transparent Mode, TM).

Under RLC AM mode, rlc layer supports ARQ function, and transmitting terminal can receive RLC state report from receiving end It accuses.In addition, transmitting terminal can execute the re-transmission of unacknowledged RLC PDU by state report.It may therefore be assured that inerrancy Reliable data transmission, therefore RLC AM mode is suitable for requiring the service of high reliability.

On the contrary, not supporting ARQ function under RLC UM mode.Therefore, under RLC UM mode, transmitting terminal does not receive RLC State report, and do not execute functions of retransmission.Under RLC UM mode, if receiving uplink grant, the RLC of transmitting terminal Layer is for cascading from the received PDCP PDU in upper layer (RLC SDU) and cascade PDCP PDU being continuously transmitted to lower layer.Therefore, The continuous data transmission of no transmission delay is possibly realized, therefore RLC UM mode is useful for the service to transport latency sensitive 's.Under RLC mode, rlc layer will be sent directly to lower layer from the received PDCP PDU in upper layer, without executing any processing. That is the data from upper layer are pellucidly transmitted to lower layer from rlc layer under the TM mode of rlc layer.Therefore, logical when sending It crosses such as common signal channel of common control channel (Common Control CHannel, CCCH) and the system information that sends or seeks When exhaling message, RLC TM mode can be efficiently used.

In the disclosure, efficient buffer management method is handled with rlc layer and retransmits accelerated method for PDCP layers, therefore existing Will be described in exclude wherein rlc layer do not execute any processing mode (such as RLC TM mode) RLC AM mode and RLC UM mode.

The independent buffer structure of LTE system.

Fig. 6 is to show applicable height when operating at RLC AM when LTE system terminal according to an embodiment of the present disclosure The diagram of the buffer management method of effect.

It is efficient slow when LTE system terminal operates under RLC AM mode according to what is proposed in the disclosure with reference to Fig. 6 Rush the detailed map table and respective operations of the first embodiment of device management method.

With reference to Fig. 6, terminal has the first buffer 610 and the second buffer 620 for each logic channel, and MAC layer has third buffer 635.The first buffer, the second buffer and the third buffer of logic channel can be physics The buffer of upper division, or buffer that is physically identical but dividing in logic.In the disclosure, when actual implementation, delay Rushing device includes the buffer structure that can physically or logically divide, and be divided into according to their role such as first to Third buffer.Preferably, the first buffer can be PDCP buffer, and the second buffer can be RLC buffer, and Three buffers can be MAC buffer.

First buffer 610 can store IP grouping (the PDCP SDU) 605 into PDCP layers, generate the report of PDCP SDU Head, and PDCP PDU 620 is generated by configuring header together with PDCP SDU to store PDCP PDU wherein.This Outside, PDCP PDU generated can be passed to the second buffer 625.

If receiving uplink grant, the priority or QoS that terminal passes through each logic channel of reflection from base station Uplink grant is distributed to each logic channel.If receiving uplink grant, each logic channel is in rlc layer The length information of each PDCP PDU (RLC SDU) is input to the header of RLC PDU by cascade PDCP PDU (RLC SDU), And configure RLC PDU 630.If the size of RLC SDU is inaccurate each other when RLC SDU is cascaded to uplink grant Unanimously, then rlc layer can execute staged operation.If executing segmentation for RLC SDU, segment information is input to by rlc layer The header of RLC PDU.In addition, rlc layer can send MAC layer for the RLC PDU of completion.

MAC layer can configure a MAC PDU 640 by being multiplexed from the received RLC PDU of different logic channels, and And physical layer can be sent by MAC PDU.In addition, MAC layer can store MAC PDU, and can hold for HARQ processing Row retransmits, until receiving confirmation (ACKnowledgement, ACK).

Further detailed content can be described with reference to Fig. 7 below.

Fig. 7 is to show the height according to an embodiment of the present disclosure when operating under RLC AM mode when LTE system terminal The mapping table of the buffer management method of effect and the diagram of respective operations.

With reference to Fig. 7, if receiving PDCP PDU (RLC SDU) from the layer, rlc layer can be stored in second In buffer 710.In addition, PDCP PDU (RLC SDU) can not be stored in the second buffer 710 by rlc layer, but can be with The storage address of PDCP PDU is recorded for referring to.

If receiving the size of uplink grant, rlc layer can by the cascade of PDCP PDU (RLC SDU) come Configure a RLC PDU.Once being configured with RLC PDU as described above, rlc layer can configure mapping table based on RLC serial number 735, and including the storage address of the second buffer 740, the storage address 745 of the first buffer, segment information 750, ACK/ Non-acknowledgement (Non-ACKnowledgment, NACK) information 755 and PDCP serial number 760.For example it is possible to record wherein storage with The address of the second buffer of the corresponding RLC PDU of RLC serial number 1, and can recorde to record about being cascaded to RLC The storage address 745 of the first buffer of the information of the PDCP PDU of PDU, cascade PDCP PDU.The address of buffer can Using the beginning link as storage address and terminates link and manage.In addition, if rlc layer has been carried out staged operation, then Segment information 750 can be recorded in mapping table 735.In segment information, compared with original RLC SDU, if excluding RLC The part of the header of SDU, i.e. payload, consistent with the foremost portion of RLC SDU, then " 0 " can be registered as FI field First bit, and if payload and foremost portion are inconsistent, " 1 " can be registered as the second bit of FI field.Such as It is upper described, it can recorde segment information.In addition, the rlc layer of transmitting terminal can receive RLC state from the rlc layer of receiving end The ACK/NACK of each RLC serial number is identified after report as a result, and can recorde the ACK/NACK information of each RLC serial number 755.Furthermore, it is possible to record the information what PDCP PDU to be concatenate to RLC PDU corresponding with each RLC serial number about. That is, can recorde the information for indicating that a part of PDCP serial number 1 and 2 and PDCP serial number 3 is concatenate to RLC serial number 1. In the case where executing staged operation in rlc layer, the information about each segmentation can be marked in last segmentation.Label is last The reason of segmentation is to identify that PDCP serial number is considered ACK when receiving ACK for some RLC serial number. That is, if send PDCP serial number 3 and PDCP serial number 4 be finally segmented the RLC serial number 2 being concatenate to after receive For the ACK of RLC serial number 2, then rlc layer can receive the ACK being finally segmented for PDCP serial number 3, it can be considered that it The ACK for PDCP serial number 3 and PDCP serial number 4 has been received.

Whenever receiving uplink grant, rlc layer can generate RLC by the cascade and segmentation of PDCP PDU RLC PDU is sent lower layer by PDU.In addition, rlc layer can be sent according to the sequence appropriate of such as 715,720 and 725 With storage RLC PDU, and map information of the stored information as such as mapping table 735 can recorde.If from NACK is received for RLC serial number 1 in the received RLC state report of the rlc layer of receiving end, then the rlc layer of transmitting terminal prepares weight It passes.In this case, it if the uplink grant retransmitted is less than in the uplink grant for operating 715 beginnings, sends out The rlc layer execution of sending end is segmented again, for the new configuration header of RLC PDU of segmentation, sends the RLC PDU of configuration, and individually Record corresponding informance.

The operation of first buffer and the second buffer is as follows.

If receiving IP grouping from upper layer, PDCP layers can be by will be each to IP grouping by allocations of storage addresses IP grouping is stored in the first buffer 610 and 705, and can drive and manage the PDCP discarding timer of each IP grouping 615.Timer value can be by network configuration.For example, timer value can pass through RRC by network when terminal configures RRC connection Message and configure.If timer expiration, terminal from the first buffer abandon PDCP PDU corresponding with timer or PDCP SDU。

If PDCP PDU corresponding with timer is sent to rlc layer, PDCP layers can will be with PDCP PDU phase Corresponding discarding indicator is sent to rlc layer.The PDCP for being transmitted to rlc layer of the second buffer can be indicated by abandoning indicator Storage address, PDCP serial number or the map information about PDCP PDU of PDU.In addition, if by PDCP state report from connecing The PDCP layer of receiving end receives the ACK/NACK information about PDCP PDU, then can abandon confirmation from the first buffer for PDCP layers PDCP PDU, and if not expired timer corresponding with the PDCP PDU of discarding exists, it can stop and lose Abandon timer.

If becoming the RLC in rlc layer not yet with from the corresponding PDCP PDU of PDCP layers of received discarding indicator A part of PDU is mapped to thereon not yet, then rlc layer abandons corresponding informance.That is, rlc layer is slow from second Device discarding is rushed to be transmitted to and be stored in the PDCP PDU in rlc layer (RLC SDU) and relevant information and map information.If The PDCP PDU indicated by discarding indicator has become a part of RLC PDU, then rlc layer is not abandoned from the second buffer PDCP PDU and relevant information.This is because if the PDCP PDU for having become a part of RLC PDU is dropped, RLC sequence It will appear gap in number, so as to cause transmission delay.That is, receiving end cannot distinguish that corresponding RLC serial number is to transmit That loses in the process is still abandoned in transmitting terminal by abandoning indicator.

In addition, if receiving RLC state report from the rlc layer of receiving end, then rlc layer can identify each RLC serial number ACK/NACK result.In addition, rlc layer can abandon RLC PDU from the second buffer in the case where the RLC PDU of confirmation, And relevant mapping information can be abandoned.In addition, the RLC PDU that rlc layer is negative confirmation prepares to retransmit.If in holding for re-transmission Uplink grant is enough in the case that RLC PDU between the departure date for re-transmission is stored in the second buffer, then rlc layer can It is retransmitted with being immediately performed.In addition, if uplink grant is insufficient, then at operation 730, rlc layer can be executed and is segmented again To send RLC PDU.If the RLC PDU for re-transmission is not stored in the second buffer, and the information being previously generated (header information and the information about cascade PDCP PDU) and map information are recorded, then the rlc layer of transmitting terminal can be based on This regenerates RLC PDU dynamically to execute re-transmission.

Rlc layer can be identified by RLC state report RLC serial number ACK/NACK's as a result, identification mapping table 735, And determine the ACK/NACK result of corresponding PDCP serial number 760.If identifying the ACK of PDCP serial number, rlc layer can be incited somebody to action The ACK information of PDCP serial number is transmitted to PDCP layers.PDCP layers can identify ACK information, and can recorde PDCP serial number ACK/NACK information.The ACK information of PDCP serial number can be used during handover operation.That is, when terminal switches out Now, switching can be gone to the PDCP serial number according to confirmation of the sequence of serial number after minimum PDCP serial number for PDCP layers Target BS re-transmission.If the selective retransmission during network support switching, PDCP layers can be only to the target of switching The PDCP PDU of base station re-transmission negative confirmation.

Fig. 8 A and Fig. 8 B are to show wherein LTE system terminal according to an embodiment of the present disclosure in RLC AM mode down tube The diagram of operation that manage buffer, terminal.

With reference to Fig. 8 A, if receiving IP grouping from upper layer, PDCP layers of terminal operate at operation 801, in operation 805 Place receives IP grouping, and can be stored at operation 810 by the way that each IP to be grouped by allocations of storage addresses to IP grouping In the first buffer.In addition, PDCP layers of terminal can drive and manage the PDCP of each IP grouping to abandon at operation 815 Timer.If timer expiration, at operation 820, terminal abandons PDCP corresponding with timer from the first buffer PDU or PDCP SDU.If PDCP PDU corresponding with timer is sent to rlc layer, then is operating at operation 825 At 830, PDCP layers can send rlc layer for discarding indicator corresponding with PDCP PDU.Abandoning indicator can indicate Storage address, PDCP serial number or the map information about PDCP PDU of the PDCP PDU for being transmitted to rlc layer of second buffer. In addition, if receiving the ACK/NACK information about PDCP PDU from the PDCP layer of receiving end by PDCP state report, then PDCP layers can abandon the PDCP PDU confirmed from the first buffer, and if there is corresponding with the PDCP PDU of discarding Not expired timer, then at operation 820, PDCP layers can stop and abandon timer.

It is operated at operation 835 with reference to Fig. 8 B, terminating layer RLC.If receiving discarding from PDCP layers at operation 840 to refer to Show symbol, then at operation 840, terminal rlc layer may determine whether to abandon information.Specifically, and if lost at operation 845 Abandoning the corresponding PDCP PDU of indicator becomes a part of the RLC PDU in rlc layer not yet or is mapped to not yet Thereon, then at operation 855, terminal rlc layer abandons corresponding informance.The content for abandoning indicator is passed to rlc layer, and eventually Rlc layer is held to abandon stored PDCP PDU (RLC SDU), information related to this and map information from the second buffer. If the PDCP PDU indicated by discarding indicator has become a part (845) of RLC PDU, at operation 850, terminal Rlc layer 835 does not abandon PDCP PDU and relevant information from the second buffer.

If receiving RLC state report from the rlc layer of receiving end, rlc layer can identify the ACK/ of each RLC serial number NACK result.In addition, at operation 865, rlc layer is buffered from second in the case where operating the RLC PDU of the confirmation at 860 Device abandons RLC PDU, and abandons relevant mapping information.In addition, rlc layer is the RLC PDU of negative confirmation at operation 875 Prepare to retransmit.If in the case that the RLC PDU during the execution of re-transmission for re-transmission is stored in the second buffer Uplink grant is enough, then rlc layer can be immediately performed re-transmission, and if uplink grant is insufficient, rlc layer can execute Again it is segmented to send RLC PDU.If the RLC PDU for re-transmission is not stored in the second buffer, and first previous existence At information (header information and information) about cascade PDCP PDU and map information be recorded, then rlc layer can be based on This regenerates RLC PDU dynamically to execute re-transmission.

Rlc layer can be identified by RLC state report RLC serial number ACK/NACK's as a result, operation 870 at identify Map information, and determine the ACK/NACK result of corresponding PDCP serial number.If identifying the ACK of PDCP serial number, RLC The ACK information of PDCP serial number can be transmitted to PDCP layers by layer.PDCP layers can identify ACK information, and can recorde PDCP The ACK/NACK information of serial number.

According to the efficient buffer management side of the disclosure being applicable in when LTE system terminal operates under RLC AM mode A kind of method has been proposed in the first embodiment of method, abandons timer by PDCP in the method independently to manage for PDCP layers The first buffer is managed, and rlc layer independently manages the second buffer by RLC ACK.

According to the efficient buffer management side of the disclosure being applicable in when LTE system terminal operates under RLC UM mode The first embodiment of method is as follows.

When being operated under RLC UM mode, according to the terminal of the disclosure have structure as shown in FIG. 6, and with such as On operated with reference to Fig. 7 similar mode of mode described.However, being different from RLC AM mode, do not supported under RLC UM mode ARQ function, therefore do not execute re-transmission.In addition, not executing RLC state report.Therefore, for retransmitting, it is not necessary that record is The RLC PDU of transmission or information related to this and map information.This is between RLC UM mode and RLC AM mode Maximum difference.

In the disclosure, the LTE system terminal wherein under RLC UM mode efficiently manages the first reality of the method for buffer Under applying for example.

If receiving IP grouping from upper layer, PDCP layers can be by will be each to IP grouping by allocations of storage addresses IP grouping is stored in the first buffer 610 and 705.In addition, PDCP layers can drive and manage the PDCP of each IP grouping to lose Abandon timer.Timer value can be by network configuration.That is, timer value can be by net when terminal configures RRC connection Network is configured by RRC information.If timer expiration, terminal abandons PDCP corresponding with timer from the first buffer PDU or PDCP SDU.

If PDCP PDU corresponding with timer is sent to rlc layer, PDCP layers can will be with PDCP PDU phase Corresponding discarding indicator is sent to rlc layer.The PDCP for being transmitted to rlc layer of the second buffer can be indicated by abandoning indicator Storage address, PDCP serial number or the map information about PDCP PDU of PDU.In addition, if by PDCP state report from connecing The PDCP layer of receiving end receives the ACK/NACK information about PDCP PDU, then can abandon confirmation from the first buffer for PDCP layers PDCP PDU, and if not expired timer corresponding with the PDCP PDU of discarding exists, it can stop and lose Abandon timer.

If receiving discarding indicator from PDCP layers, rlc layer can abandon information.Specifically, if referred to discarding Show that the corresponding PDCP PDU of symbol becomes a part of the RLC PDU in rlc layer not yet or is mapped to not yet thereon, Then rlc layer abandons corresponding informance.The content for abandoning indicator is passed to rlc layer, and rlc layer abandons institute from the second buffer PDCP PDU (RLC SDU), information related to this and the map information of storage.If the PDCP indicated by discarding indicator PDU has become a part of RLC PDU, then rlc layer does not abandon PDCP PDU and relevant information from the second buffer.This be because If be dropped to have become the PDCP PDU of a part of RLC PDU, it will appear gap in RLC serial number, so as to cause biography Defeated delay.That is, receiving end cannot distinguish corresponding RLC serial number be lost in transmission process or in transmitting terminal It is abandoned by abandoning indicator.

In addition, rlc layer can receive uplink grant, and can be configured by the cascade and segmentation of PDCP PDU RLC PDU.In addition, rlc layer abandons RLC PDU from the second buffer after completing RLC PDU and passing it to MAC layer, And abandon relevant information and map information.Therefore, under RLC UM mode, rlc layer send RLC PDU, then by they with Relevant information abandons together, without they are stored directly in the second buffer.This is because not propped up under RLC UM mode ARQ function is held, therefore is not necessarily to information of the record for re-transmission.

According to the efficient buffer management side of the disclosure being applicable in when LTE system terminal operates under RLC UM mode A kind of method has been proposed in the first embodiment of method, abandons timer by PDCP in the method independently to manage for PDCP layers The first buffer is managed, and rlc layer is according to whether send RLC PDU independently to manage the second buffer.

Fig. 9 A and Fig. 9 B are to show wherein LTE system terminal according to an embodiment of the present disclosure in RLCUM mode down tube The diagram of operation that manage buffer, terminal.

With reference to Fig. 9 A, if receiving IP grouping from upper layer, PDCP layers of terminal can be operated at operation 901, grasped Make at 905, PDCP layers can receive IP grouping, and at operation 905, and terminal can be by dividing allocations of storage addresses to IP Each IP grouping is stored in the first buffer by group.In addition, PDCP layers of terminal can drive and manage at operation 915 The PDCP of each IP grouping abandons timer.If timer expiration, at operation 920, terminal is abandoned from the first buffer PDCP PDU or PDCP SDU corresponding with timer.If at operation 925, PDCP PDU quilt corresponding with timer It is transmitted to rlc layer, then at operation 930, PDCP layers can send RLC for discarding indicator corresponding with PDCP PDU Layer.Storage address, PDCP serial number or the pass of the PDCP PDU for being transmitted to rlc layer of the second buffer can be indicated by abandoning indicator In the map information of PDCP PDU.In addition, if being received from the PDCP layer of receiving end about PDCP by PDCP state report The ACK/NACK information of PDU, then PDCP layers can from the first buffer abandon confirmation PDCP PDU, and if there is with lose The corresponding not expired timer of the PDCP PDU of abandoning, then at operation 920, PDCP layers can stop and abandon timer.

With reference to Fig. 9 B, terminal rlc layer can operate at operation 935.It is lost if received at operation 940 from PDCP layers Indicator is abandoned, then terminal rlc layer 935 can abandon information.Specifically, corresponding with indicator is abandoned if at operation 945 PDCP PDU become a part of the RLC PDU in rlc layer not yet or be mapped to not yet thereon, then operating At 955, terminal rlc layer abandons corresponding informance.The content for abandoning indicator is passed to rlc layer, and terminal rlc layer is from second Buffer abandons stored PDCP PDU (RLC SDU), information related to this and map information.If in operation 945 Place, the PDCP PDU indicated by discarding indicator have become a part of RLC PDU, then at operation 950, terminal rlc layer PDCP PDU and relevant information are not abandoned from the second buffer.

Rlc layer can receive uplink grant, and can configure RLC by the cascade and segmentation of PDCP PDU PDU.After completing RLC PDU at operation 940 and passing it to MAC layer, rlc layer abandons RLC PDU from the second buffer, And abandon relevant information and map information.That is, rlc layer sends RLC PDU under RLC UM mode, then grasping Make to abandon them together with relevant information at 960, without they are stored directly in the second buffer.This is because ARQ function is not supported under RLC UM mode, therefore is not necessarily to information of the record for re-transmission.

According to the efficient buffer being applicable in when LTE system terminal operates under RLC AM mode proposed in the disclosure The first embodiment of management method and the efficient buffer management being applicable in when LTE system terminal operates under RLC UM mode The first embodiment of method, PDCP layers independently manage the first buffer, and rlc layer independently manages the second buffer.Cause This, embodiments thereof are simple and uncomplicated.However, being contemplated that more optimized buffer management to support high data rate Method.For example, big buffer sizes may be needed to prevent if the first buffer is not emptied quickly with high data rate Only the buffer as caused by high data rate overflows.If buffer overflows and configures small timer value in order to prevent, count According to preceding loss may be being sent, so as to cause data throughout decline.

Hereinafter, the efficient buffer tubes being applicable in when operating under RLC AM mode when LTE system terminal are proposed The second embodiment of reason method and the efficient buffer management side being applicable in when LTE system terminal operates under RLC UM mode The second embodiment of method.

Second in the efficient buffer management method being applicable in when LTE system terminal operates under RLC AM mode is real It applies in example, the first buffer is not managed independently by PDCP layers, but by reflecting that the RLC ACK result of rlc layer manages.This Outside, in the second embodiment for the efficient buffer management method being applicable in when LTE system terminal operates under RLC UM mode In, the first buffer is not managed independently by PDCP layers, but by reflecting whether to manage and sending the RLC PDU in rlc layer.

If from receiving end, RLC equipment receives RLC state report under RLC AM mode, and receives RLC PDU ACK, then no longer it is necessary to have RLC PDU of confirmation, information correspondingly and any further reflect for RLC equipment Firing table information, and it is reasonable that RLC equipment, which abandons them from the second buffer,.ACK has been received in addition, if being cascaded to The PDCP PDU of RLC PDU be present in the first buffer, even if then such information is without in re-transmission, therefore even if PDCP abandons timer and not yet expires, and also no longer it is necessary to have them for rlc layer.Therefore, when the LTE system according to the disclosure In the second embodiment for the efficient buffer management method being applicable in when terminal operates under RLC AM mode, rlc layer may be from Second buffer abandons the RLC PDU that RLC ACK has been received.In addition, if rlc layer is cascaded to RLC to PDCP layers of notice The PDCP PDU of PDU then abandons corresponding PDCP PDU, and PDCP PDU and timer phase with discarding from the first buffer Corresponding information is released and abandons.

On the contrary, under RLC UM mode ARQ function is not supported, therefore after RLC PDU is sent for re-transmission, It is not necessary to storage corresponding informance.Therefore, after sending RLC PDU, corresponding RLC PDU is not stored in second by rlc layer In buffer, but abandon relevant information (if any).In addition, RLC PDU is once had sent, even if PDCP abandons timing Device not yet expires, and also no longer it is necessary to have the PDCP PDU for being cascaded to RLC PDU for rlc layer.Therefore, when according to the disclosure In the second embodiment for the efficient buffer management method being applicable in when LTE system terminal operates under RLC UM mode, sending out After sending RLC PDU, corresponding RLC PDU is not stored in the second buffer by rlc layer, but discarding relevant information (if If having).In addition, if the information about the PDCP PDU for being cascaded to RLC PDU is sent to PDCP layers, even if then PDCP loses It abandons timer not yet to expire, the PDCP layers of information also abandoned from the first buffer immediately about PDCP PDU.

Figure 10 A and Figure 10 B are to show wherein LTE system terminal according to an embodiment of the present disclosure under RLC AM mode The diagram of operation that manage buffer, terminal.

With reference to Figure 10 A, if receiving IP grouping from upper layer, PDCP layers of terminal can operate at operation 1001, In It operates at 1005, PDCP layers can receive IP grouping, and at operation 1005, terminal can be by giving allocations of storage addresses Each IP grouping is stored in the first buffer by IP grouping.In addition, PDCP layers of terminal can drive simultaneously at operation 1015 The PDCP for managing each IP grouping abandons timer.If timer expiration, at operation 1020, terminal is from the first buffer Abandon PDCP PDU or PDCP SDU corresponding with timer.If at operation 1025, PDCP corresponding with timer PDU is sent to rlc layer, then at operation 1030, PDCP layers can be sent discarding indicator corresponding with PDCP PDU To rlc layer.Storage address, the PDCP sequence of the PDCP PDU for being transmitted to rlc layer of the second buffer can be indicated by abandoning indicator Number or about PDCP PDU map information.

In addition, if receiving the ACK/NACK about PDCP PDU from the PDCP layer of receiving end by PDCP state report Information then can abandon the PDCP PDU confirmed from the first buffer for PDCP layers.In addition, if in the presence of the PDCP PDU with discarding Corresponding not expired timer, then at operation 1020, PDCP layers can stop and abandon timer.In addition, PDCP layers can To receive the information about the PDCP PDU for being cascaded to the RLC PDU that RLC ACK has been received from rlc layer.Due to PDCP PDU means that they have been successfully delivered to receiving end, so no longer it is necessary to be stored in the first buffer, And PDCP layers abandon they, corresponding informance and map information.If there is not expired timer, then at operation 1020, PDCP layers can stop and abandon timer.Based on RLC ACK to manage the first buffer, the root during switching It is important according to the PDCP layer operation of terminal differently to manage the first buffer.

As the first situation, terminal can use network configuration to execute PDCP layer operation, wherein in the network configuration In, during switching, after up to the present minimum PDCP serial number is delivered successfully in order, PDCP layers should be again to switching Target BS retransmit PDCP PDU.In this case, have been received RLC ACK's about being cascaded to if received The information of the PDCP PDU of RLC PDU then should store and be received sequentially all ACK's according to PDCP serial number for PDCP layers Minimum PDCP serial number.In addition, for the PDCP serial number higher than minimum PDCP serial number, even if RLC ACK has been received in rlc layer, PDCP layers should not also abandon them.It can only that is, having been based on PDCP PDU that RLC ACK identifies that it is delivered successfully It is abandoned according to the sequence of its PDCP serial number.For example, even if identify PDCP serial number 1,2,3,4,5,9 and 10 successfully from The RLC ACK of rlc layer is transmitted, can only also be abandoned from the first buffer PDCP serial number 1,2,3,4 and 5 and with corresponding PDCP The relevant information of PDU and map information.

As second situation, terminal can use network configuration to execute PDCP layer operation, wherein in the network configuration In, PDCP layers selectively should retransmit the PDCP PDU being up to the present not yet delivered successfully to the target BS of switching.In In this case, if receiving the information about the PDCP PDU for being cascaded to the RLC PDU that RLC ACK has been received, PDCP layers can abandon information corresponding with PDCP PDU and map information from the first buffer, and can individually store About the information for the PDCP serial number for receiving ACK in order, to use the information during switching.

With reference to Figure 10 B, terminal rlc layer operates at operation 1035.It is lost if received at operation 1040 from PDCP layers Indicator is abandoned, then terminal rlc layer can abandon information corresponding with indicator is abandoned.Specifically, if at operation 1045, PDCP PDU corresponding with indicator is abandoned becomes a part of the RLC PDU in rlc layer not yet or is reflected not yet It is mapped to thereon, then at operation 1055, terminal rlc layer abandons corresponding informance.The content for abandoning indicator is passed to rlc layer, And terminal rlc layer abandons stored PDCP PDU (RLC SDU), information related to this and mapping from the second buffer Information.If the PDCP PDU indicated by discarding indicator has become a part (1045) of RLC PDU, in operation 1050 Place, terminal rlc layer do not abandon PDCP PDU and relevant information from the second buffer.

If receiving RLC state report from the rlc layer of receiving end at operation 1040, rlc layer can identify each The ACK/NACK result of RLC serial number.In addition, in the case where operating the RLC PDU of the confirmation at 1060, at operation 1065, Rlc layer abandons RLC PDU from the second buffer, and abandons relevant mapping information.At operation 1075, rlc layer is that negative is true The RLC PDU recognized prepares to retransmit.If the RLC PDU during the execution of re-transmission for re-transmission is stored in the second buffer In the case where uplink grant it is enough, then rlc layer can be immediately performed re-transmission, and if uplink grant is insufficient, RLC Layer, which can execute, to be segmented again to send RLC PDU.If the RLC PDU for re-transmission is not stored at the second buffer In, and the information (header information and the information about cascade PDCP PDU) and map information that are previously generated are recorded, then RLC Layer can dynamically regenerate RLC PDU based on this to execute re-transmission.

Rlc layer can be identified by RLC state report RLC serial number ACK/NACK's as a result, operation 1070 at know Other map information, and determine the ACK/NACK result of corresponding PDCP serial number.If identifying the ACK of PDCP serial number, The ACK information of PDCP serial number can be transmitted to PDCP layers by rlc layer.PDCP layers can identify ACK information, and can be used ACK information abandons corresponding PDCP PDU from the first buffer.

Therefore, in the efficient buffer management method being applicable in when LTE system terminal operates under RLC AM mode In second embodiment, which is characterized in that rlc layer abandons the RLC PDU that RLC ACK has been received from the second buffer, to The PDCP layers of PDCP PDU for notifying to be cascaded to RLC PDU, abandon corresponding PDCP PDU from the first buffer, and discharge and lose Abandon corresponding informance and timer.It therefore, can also be efficient even if quickly emptying the first buffer using the buffer of small size Ground manages buffer, therefore can be with maximum efficiency.

Figure 11 A and Figure 11 B are to show wherein LTE system terminal according to an embodiment of the present disclosure under RLC UM mode The diagram of operation that manage buffer, terminal.

With reference to Figure 11 A, if receiving IP grouping from upper layer, PDCP layers of terminal can operate at operation 1101, In It operates at 1105, PDCP layers can receive IP grouping, and at operation 1110, terminal can be by dividing allocations of storage addresses to IP Each IP grouping is stored in the first buffer by group, and at operation 1115, can be driven and be managed each IP grouping PDCP abandon timer.If timer expiration, at operation 1120, terminal abandons and timer phase from the first buffer Corresponding PDCP PDU or PDCP SDU.If PDCP PDU corresponding with timer is sent to RLC at operation 1125 Layer, then at operation 1130, PDCP layers can send rlc layer for discarding indicator corresponding with PDCP PDU.Discarding refers to Show that symbol can indicate the storage address of the PDCP PDU for being transmitted to rlc layer of the second buffer, PDCP serial number or about PDCP The map information of PDU.In addition, if being received from the PDCP layer of receiving end about PDCP PDU's by PDCP state report ACK/NACK information, then PDCP layers can from the first buffer abandon confirmation PDCP PDU, and if there is with discarding The corresponding not expired timer of PDCP PDU, then at operation 1120, PDCP layers can stop and abandon timer.In addition, If sending RLC PDU from rlc layer, and rlc layer will be passed about the information for the PDCP PDU for being cascaded to transmitted RLC PDU PDCP layers are delivered to, then the PDCP layers of information that can be abandoned from the first buffer about transmitted PDCP PDU, and if right It answers timer not expire, then can discharge and abandon timer for PDCP layers.

With reference to Figure 11 B, terminal rlc layer can operate at operation 1135.If received at operation 1140 from PDCP layers To indicator is abandoned, then terminal rlc layer 1135 can abandon information corresponding with indicator is abandoned.Specifically, if grasping Make at 1145, PDCP PDU corresponding with indicator is abandoned becomes a part of the RLC PDU in rlc layer not yet or go back It is not mapped onto thereon, then at operation 1155, terminal rlc layer abandons corresponding informance.The content for abandoning indicator is passed To rlc layer, and terminal rlc layer abandons stored PDCP PDU (RLC SDU), information related to this from the second buffer And map information.If the PDCP PDU indicated by discarding indicator has become one of RLC PDU at operation 1145 Point, then at operation 1150, terminal rlc layer does not abandon PDCP PDU and relevant information from the second buffer.

Rlc layer can receive uplink grant, and can configure RLC by the cascade and segmentation of PDCP PDU PDU.After completing RLC PDU at operation 1140 and passing it to MAC layer, at operation 1160, rlc layer is buffered from second Device abandons RLC PDU, and abandons relevant information and map information.That is, rlc layer sends RLC under RLC UM mode Then PDU abandons them together with relevant information, without they are stored directly in the second buffer.This is because ARQ function is not supported under RLC UM mode, therefore is not necessarily to information of the record for re-transmission.In addition, at operation 1165, Rlc layer can determine the information about the PDCP PDU for being cascaded to transmitted RLC PDU and pass it to PDCP layers, and The information can be used to manage the first buffer.

Therefore, in the efficient buffer management method being applicable in when LTE system terminal operates under RLC UM mode In second embodiment, which is characterized in that after sending RLC PDU, corresponding RLC PDU is not stored in second and delayed by rlc layer It rushes in device, but abandons relevant information (if any), and the information about the PDCP PDU for being cascaded to RLC PDU is sent out It is sent to PDCP layers.Even if PDCP timer does not expire, PDCP layers can also abandon from the first buffer about PDCP PDU immediately Information.

The sharing synthesis process structure of LTE system.

Figure 12 is to show according to an embodiment of the present disclosure to be applicable in when operating under RLC AM mode when LTE system terminal Mapping table and buffer management method diagram, and show detailed map table and respective operations.

With reference to Figure 12, terminal has the 4th buffer for each logic channel.4th buffer can be integrated slow Device is rushed, wherein integrating in buffer and sharing using as shown in Figure 6 and Figure 7 the first buffer and the second buffer at this.It is preferred that Ground, the 4th buffer can be sharing synthesis process.Therefore, by using sharing synthesis process, buffer can be managed more efficiently. 4th buffer of logic channel can be the buffer physically divided, or buffering that is physically identical but dividing in logic Device.In the disclosure, when actual implementation, buffer includes the buffer structure that can physically or logically divide.

4th buffer 1205 can store IP grouping (the PDCP SDU) 1210 into PDCP layers, generate PDCP SDU's Header, and it is generated to store wherein to generate PDCP PDU 1215 by being configured together with PDCP SDU header PDCP PDU.In addition, if receive uplink grant from base station, then the priority that terminal passes through each logic channel of reflection Or uplink grant is distributed to each logic channel by QoS.Uplink grant is received if as discussed above, then RLC PDCP PDU (RLC SDU) in 4th buffer is cascaded to each logic channel by layer, by each PDCP PDU (RLC SDU) Length information be input to the header of RLC PDU, and dynamic configuration RLC PDU 630.If when RLC SDU is cascaded to uplink When link authorization, the size and uplink grant of RLC SDU is inaccurately consistent, then rlc layer can execute staged operation.If Segmentation is executed for RLC SDU, then segment information is input to the header of RLC PDU by rlc layer.In addition, rlc layer can will be completed RLC PDU be sent to MAC layer.

In addition, MAC layer can configure a MAC PDU by being multiplexed from the received RLC PDU of different logic channels, and And physical layer can be sent by MAC PDU.In addition, MAC layer can store MAC PDU, and can hold for HARQ processing Its re-transmission of row, until receiving ACK.

If the size of uplink grant be it is known, the 4th buffer can pass through PDCP PDU (RLC SDU) Cascade configure a RLC PDU.What is proposed in the disclosure is applicable in when LTE system terminal operates under RLC AM mode Efficient buffer management method 3rd embodiment in, after RLC PDU is configured and sends, RLC PDU can not It is stored for retransmitting.Therefore, in the third embodiment, cascade during the configuration of the RLC PDU in the 4th buffer Storage address, segment information and the header information of PDCP PDU is recorded in the mapping table, and is necessary if retransmitted, The information of reference record dynamically reconfigures and sends RLC PDU.

Once being configured with RLC PDU as described above, rlc layer can configure mapping table 1220 based on RLC serial number.For example, In order to record the information about the PDCP PDU for being cascaded to RLC PDU corresponding with RLC serial number 1, rlc layer can recorde cascade PDCP PDU the 4th buffer storage address.The address of buffer can by storage address link and terminate chain Road composition.In addition, if rlc layer has been carried out staged operation, then it can recorde segment information.In segment information, with original Beginning RLC, SDU was compared, consistent with the foremost portion of RLC SDU if excluding the part of the header of RLC SDU, i.e. payload, Then " 0 " can be registered as the first bit of FI field, and if payload and foremost portion are inconsistent, and " 1 " can be by It is recorded as the first bit of FI field.Compared with original RLC SDU, if the decline one of payload and RLC SDU It causes, then " 0 " can be registered as the second bit of FI field, and if payload and decline are inconsistent, and " 1 " can be with It is registered as the second bit of FI field.Rlc layer can record segment information as described above.

In addition, the rlc layer of transmitting terminal can be identified after receiving RLC state report from the rlc layer of receiving end it is each The ACK/NACK of RLC serial number is as a result, and can recorde the ACK/NACK of each RLC serial number.In addition, rlc layer can recorde pass What PDCP PDU the information of RLC PDU corresponding with each RLC serial number is concatenate in.That is, can recorde finger Show that a part of PDCP serial number 1 and 2 and PDCP serial number 3 is concatenate to the information of RLC serial number 1.Segmentation behaviour is executed in rlc layer In the case where work, the information about each segmentation can be marked in last segmentation.

The reason of label finally segmentation is in order to which what PDCP serial number identified when receiving ACK for some RLC serial number It is considered ACK.That is, if being concatenate in the last segmentation for sending PDCP serial number 3 and PDCP serial number 4 Receive the ACK for RLC serial number 2 after RLC serial number 2, then rlc layer can receive being finally segmented for PDCP serial number 3 ACK, it can be considered that the ACK for PDCP serial number 3 and PDCP serial number 4 has been received in it.

Whenever receiving uplink grant, rlc layer can generate RLC by the cascade and segmentation of PDCP PDU RLC PDU is sent lower layer by PDU.In addition, rlc layer can send and store in suitable order RLC PDU.For example, Rlc layer can recorde map information of the information as such as mapping table 1220.If received in the rlc layer from receiving end NACK is received for RLC serial number 1 in RLC state report, then rlc layer prepares to retransmit.In this case, if for retransmitting Uplink grant be less than beginning uplink grant, then rlc layer execution be segmented again, it is new for the RLC PDU of segmentation Configuration header, and send the RLC PDU of configuration.In addition, rlc layer can individually be recorded about re-transmission at operation 1225 The information of RLC PDU.

The operation of 4th buffer is as follows.

If receiving IP grouping from upper layer, PDCP layers can be by giving each IP grouping will allocations of storage addresses Each IP grouping is stored in the 4th buffer.In addition, PDCP layers can drive and manage the PDCP of each IP grouping to abandon and determine When device.Timer value can be by network configuration.That is, timer value can be led to by network when terminal configures RRC connection It crosses RRC information and configures.If timer expiration, terminal abandons PDCP PDU corresponding with timer from the 4th buffer Or PDCP SDU.If PDCP PDU corresponding with timer is sent to rlc layer, PDCP layers can will be with PDCP PDU Corresponding discarding indicator is sent to rlc layer.Abandon indicator can indicate the PDCP PDU serial number for being sent to rlc layer or The map information of PDCP PDU.In addition, if being received from the PDCP layer of receiving end about PDCP by PDCP state report The ACK/NACK information of PDU then can abandon the PDCP PDU confirmed from the 4th buffer for PDCP layers, and if with discarding The corresponding not expired timer of PDCP PDU exists, then it can stop and abandon timer.In addition, PDCP layers can be from Rlc layer receives the information about the PDCP PDU for being cascaded to the RLC PDU that RLC ACK has been received.Since PDCP PDU anticipates Taste they be successfully delivered to receiving end, so no longer it is necessary to be stored in the 4th buffer.Therefore, The information being stored in the 4th buffer can be dropped.Specifically, it can abandon and be successfully delivered to the PDCP of receiving end The corresponding information of PDU and map information, and if there is not expired timer, timer can also be stopped and lose It abandons.Based on RLC ACK to manage four buffers, the PDCP layer operation during switching according to terminal is come different Management the 4th buffer in ground is important.

As the first situation, terminal can use network configuration to execute PDCP layer operation, wherein in the network configuration In, during switching, after up to the present minimum PDCP serial number is delivered successfully in order, PDCP layers should be again to switching Target BS retransmit PDCP PDU.In this case, have been received RLC ACK's about being cascaded to if received The information of the PDCP PDU of RLC PDU then should store and be received sequentially all ACK's according to PDCP serial number for PDCP layers Minimum PDCP serial number.In addition, for the PDCP serial number higher than minimum PDCP serial number, even if RLC ACK has been received in rlc layer, PDCP layers should not also abandon them.It can only that is, having been based on PDCP PDU that RLC ACK identifies that it is delivered successfully It is abandoned according to the sequence of its PDCP serial number.For example, even if identify PDCP serial number 1,2,3,4,5,9 and 10 successfully from The RLC ACK of rlc layer is transmitted, can only also be abandoned from the 4th buffer PDCP serial number 1,2,3,4 and 5 and with corresponding PDCP The relevant information of PDU and map information.

As second situation, terminal can use network configuration to execute PDCP layer operation, wherein in the network configuration In, PDCP layers selectively should retransmit the PDCP PDU being up to the present not yet delivered successfully to the target BS of switching.In In this case, if receiving the information about the PDCP PDU for being cascaded to the RLC PDU that RLC ACK has been received, PDCP layers can abandon information corresponding with PDCP PDU and map information from the 4th buffer, and can individually store About the information for the PDCP serial number for receiving ACK in order, to use the information during switching.

If receiving discarding indicator from PDCP layers, with abandon the corresponding PDCP PDU of indicator not yet at For RLC PDU a part or not yet be mapped to thereon in the state of, rlc layer can abandon corresponding informance.Specifically, Rlc layer abandons and is transmitted to and is stored in the PDCP PDU in rlc layer (RLC SDU) relevant information and map information.Such as The PDCP PDU that fruit is indicated by discarding indicator has become a part of RLC PDU, then rlc layer does not abandon PDCP PDU and phase Close information.This is because if the PDCP PDU for having become a part of RLC PDU is dropped, between will appear in RLC serial number Gap, so as to cause transmission delay.Receiving end cannot distinguish that corresponding RLC serial number is lost or sent in transmission process It is abandoned in end by abandoning indicator.

If receiving RLC state report from the rlc layer of receiving end, rlc layer can identify the ACK/ of each RLC serial number NACK as a result, and in the case where the RLC PDU of confirmation, rlc layer abandons map information related to this.Rlc layer is negative The RLC PDU of confirmation prepares to retransmit.If uplink grant is enough in the case where executing re-transmission, rlc layer be can be used Map information dynamically regenerates and retransmits RLC PDU, and if uplink grant is insufficient, rlc layer can grasped Make to execute at 1225 and be segmented again, and dynamically regenerates and send RLC PDU.

Rlc layer can be identified by RLC state report RLC serial number ACK/NACK's as a result, identification map information 1220, and determine the ACK/NACK result of corresponding PDCP serial number.If identifying the ACK of PDCP serial number, rlc layer can be with The ACK information of PDCP serial number is transmitted to PDCP layers.PDCP layers can identify ACK information, and can recorde each PDCP sequence Number ACK/NACK information.The ACK information of PDCP serial number can be used during switching.When terminal switches out now, PDCP Layer can go to the re-transmission of the target BS of switching, from according to the minimum PDCP for being received sequentially all ACK of serial number PDCP serial number after serial number starts.If the selective retransmission during network support switching, PDCP layers can be only to switching Target BS retransmit negative confirmation PDCP PDU.

In the efficient buffer management being applicable in when LTE system terminal operates under RLC AM mode according to the disclosure In the fourth embodiment of method, which is characterized in that the 4th buffer is not managed independently by PDCP layers, but passes through reflection RLC Layer RLC ACK result and manage.In addition, efficient slow what is be applicable in when LTE system terminal operates under RLC UM mode It rushes in the fourth embodiment of device management method, which is characterized in that the 4th buffer is not managed independently by PDCP layers, but is passed through It reflects whether the RLC PDU sent in rlc layer and manages.

If from receiving end, RLC equipment receives RLC state report under RLC AM mode, and receives RLC PDU ACK, then RLC equipment no longer it is necessary to have information corresponding with the RLC PDU of confirmation and map information, and It is reasonable that RLC equipment, which abandons them from the 4th buffer,.In addition, if being cascaded to the RLC PDU's that ACK has been received PDCP PDU is present in the 4th buffer, even if then such information is without in re-transmission, therefore even if PDCP abandons timing Device not yet expires, and also no longer it is necessary to have them for rlc layer.

Therefore, in the efficient buffering being applicable in when being operated under RLC AM mode according to the LTE system terminal of the disclosure In the 3rd embodiment of device management method, which is characterized in that rlc layer is abandoned from mapping table about having been received RLC ACK's The information of RLC PDU, the PDCP PDU for notifying to be cascaded to RLC PDU to PDCP layers, abandons corresponding PDCP from the 4th buffer PDU discharges and abandons corresponding informance and timer.

What is be applicable in when the LTE system terminal with structure as shown in figure 12 operates under RLC UM mode is efficient slow The 3rd embodiment for rushing device management method is as follows.

When being operated under RLC UM mode, according to the terminal of the disclosure have structure as shown in figure 12, and with It is operated above with reference to the similar mode of the mode of Figure 12 description.However, being different from RLC AM mode, do not propped up under RLC UM mode ARQ function is held, therefore does not execute re-transmission.In addition, not executing RLC state report.It has been sent therefore, it is not necessary to record RLC PDU or relevant information, and the map information for re-transmission.This be between RLC UM mode and RLC AM mode most Big difference.

In the disclosure, the LTE system terminal wherein under RLC UM mode efficiently manages the third reality of the method for buffer Under applying for example.

If receiving IP grouping from upper layer, PDCP layers can be by will be each to IP grouping by allocations of storage addresses IP grouping is stored in the 4th buffer 1205.In addition, PDCP layers can drive and manage the PDCP of each IP grouping to abandon and determine When device.Timer value can be by network configuration.For example, timer value can be passed through by network when terminal configures RRC connection RRC information and configure.If timer expiration, terminal from the 4th buffer abandon PDCP PDU corresponding with timer or PDCP SDU.If PDCP PDU corresponding with timer is sent to rlc layer, PDCP layers can will be with PDCP PDU phase Corresponding discarding indicator is sent to rlc layer.The storage address for the PDCP PDU for being transmitted to rlc layer can be indicated by abandoning indicator Or the map information about PDCP PDU.

In addition, if receiving the ACK/NACK about PDCP PDU from the PDCP layer of receiving end by PDCP state report Information then can abandon the PDCP PDU confirmed from the 4th buffer for PDCP layers, and if the PDCP PDU with discarding is opposite The not expired timer answered exists, then it can stop and abandon timer.

If receiving discarding indicator from PDCP layers, rlc layer can abandon information corresponding with indicator is abandoned. Specifically, if with abandon the corresponding PDCP PDU of indicator become not yet the RLC PDU in rlc layer a part or There are no being mapped to thereon, then rlc layer abandons corresponding informance.The content for abandoning indicator is passed to rlc layer, and RLC Layer abandons information relevant to PDCP PDU (the RLC SDU) that is stored and map information.

If the PDCP PDU indicated by discarding indicator has become a part of RLC PDU, rlc layer does not abandon phase Close information.This is because if the PDCP PDU for having become a part of RLC PDU is dropped, between will appear in RLC serial number Gap, so as to cause transmission delay.That is, receiving end cannot distinguish that corresponding RLC serial number is lost in transmission process Or it is abandoned in transmitting terminal by abandoning indicator.

Rlc layer can receive uplink grant, and can configure RLC by the cascade and segmentation of PDCP PDU PDU.In addition, complete RLC PDU and after passing it to MAC layer, rlc layer abandon information relevant to RLC PDU and Map information.Under RLC UM mode, rlc layer sends RLC PDU, then abandons them together with relevant information, without depositing Store up them.This is because not supporting ARQ function under RLC UM mode, therefore it is not necessarily to information of the record for re-transmission.

Under RLC UM mode, ARQ function is not supported, therefore after RLC PDU is sent for re-transmission, must not Store corresponding informance.Therefore, after sending RLC PDU, corresponding RLC PDU is not stored in the 4th buffer by rlc layer In, but abandon relevant information (if any).In addition, RLC PDU is once had sent, even if PDCP abandons timer not yet Expire, also no longer it is necessary to PDCP PDU is cascaded to RLC PDU for rlc layer.

Therefore, in the efficient buffering being applicable in when being operated under RLC UM mode according to the LTE system terminal of the disclosure In the 3rd embodiment of device management method, after sending RLC PDU, corresponding RLC PDU can not be stored in by rlc layer In four buffers and mapping table.In addition, if relevant information exists, then rlc layer abandons the information, and can will be about cascade Information to the PDCP PDU of RLC PDU is sent to PDCP layers.If receiving the information about PDCP PDU, even if PDCP loses It abandons timer not yet to expire, the PDCP layers of information that can also abandon from the 4th buffer immediately about PDCP PDU.

Figure 13 A and Figure 13 B are to show wherein LTE system terminal according to an embodiment of the present disclosure under RLC AM mode The diagram of operation that manage buffer, terminal.

With reference to Figure 13 A, if receiving IP grouping from upper layer, PDCP layers of terminal can operate at operation 1301, In It operates at 1305, PDCP layers can receive IP grouping, and at operation 1310, terminal can be by giving allocations of storage addresses Each IP grouping is stored in the 4th buffer by IP grouping.In addition, PDCP layers of terminal can drive simultaneously at operation 1315 The PDCP for managing each IP grouping abandons timer.If timer expiration, at operation 1320, terminal is from the first buffer Abandon PDCP PDU or PDCP SDU corresponding with timer.If at operation 1325, PDCP corresponding with timer PDU is sent to rlc layer, then at operation 1330, PDCP layers can be sent discarding indicator corresponding with PDCP PDU To rlc layer.The PDCP PDU serial number for being sent to rlc layer or the map information about PDCP PDU can be indicated by abandoning indicator.

In addition, if receiving the ACK/NACK about PDCP PDU from the PDCP layer of receiving end by PDCP state report Information then can abandon the PDCP PDU confirmed from the 4th buffer for PDCP layers.In addition, if in the presence of the PDCP PDU with discarding Corresponding not expired timer, then at operation 1320, PDCP layers can stop and abandon timer.In addition, PDCP layers can To receive the information about the PDCP PDU for being cascaded to the RLC PDU that RLC ACK has been received from rlc layer.Due to PDCP PDU means that they have been successfully delivered to receiving end, so no longer it is necessary to be stored in the 4th buffer, And PDCP layers can abandon them.

In addition, PDCP layers abandon information corresponding with the PDCP PDU abandoned and map information.If there is not Expire timer, then at operation 1320, PDCP layers can stop and abandon timer.The 4th is being managed based on RLC ACK In the case where buffer, it is important during switching according to the PDCP layer operation of terminal differently to manage the 4th buffer.

As the first situation, terminal can use network configuration to execute PDCP layer operation, wherein in the network configuration In, during switching, after up to the present minimum PDCP serial number is delivered successfully in order, PDCP layers should be again to switching Target BS retransmit PDCP PDU.In this case, have been received RLC ACK's about being cascaded to if received The information of the PDCP PDU of RLC PDU then should store and be received sequentially all ACK's according to PDCP serial number for PDCP layers Minimum PDCP serial number.In addition, for the PDCP serial number higher than minimum PDCP serial number, even if RLC ACK has been received in rlc layer, PDCP layers should not also abandon them.It can only that is, having been based on PDCP PDU that RLC ACK identifies that it is delivered successfully It is abandoned according to the sequence of its PDCP serial number.For example, even if identify PDCP serial number 1,2,3,4,5,9 and 10 successfully from The RLC ACK of rlc layer is transmitted, can only also be abandoned from the 4th buffer PDCP serial number 1,2,3,4 and 5 and with corresponding PDCP The relevant information of PDU and map information.

As second situation, terminal can use network configuration to execute PDCP layer operation, wherein in the network configuration In, PDCP layers selectively should retransmit the PDCP PDU being up to the present not yet delivered successfully to the target BS of switching.In In this case, if receiving the information about the PDCP PDU for being cascaded to the RLC PDU that RLC ACK has been received, PDCP layers can abandon information corresponding with PDCP PDU and map information from the 4th buffer, and can individually store About the information for the PDCP serial number for receiving ACK in order, to use the information during switching.

With reference to Figure 13 B, terminal rlc layer can operate at operation 1335.If received at operation 1340 from PDCP layers To indicator is abandoned, then terminal rlc layer can abandon information corresponding with indicator is abandoned.Specifically, if operating At 1345, PDCP PDU corresponding with indicator is abandoned becomes a part of the RLC PDU in rlc layer not yet or does not have also It is mapped to thereon, then at operation 1355, terminal rlc layer abandons corresponding informance.The content for abandoning indicator is passed to Rlc layer, terminal rlc layer abandon information relevant to PDCP PDU (the RLC SDU) that is stored and map information.If grasping Make at 1345, the PDCP PDU indicated by discarding indicator has become a part of RLC PDU, then at operation 1350, eventually End rlc layer does not abandon information relevant to PDCP PDU.

If receiving RLC state report from the rlc layer of receiving end at operation 1340, rlc layer can identify each The ACK/NACK result of RLC serial number.In addition, in the case where operating the RLC PDU of the confirmation at 1360, at operation 1365, Rlc layer abandons relevant mapping information.At operation 1375, rlc layer is that the RLC PDU of negative confirmation prepares to retransmit.If in weight Uplink grant during the execution of biography for re-transmission is enough, then rlc layer can map information and report based on RLC PDU Head information dynamically regenerates and retransmits RLC PDU.In addition, if uplink grant is insufficient, then rlc layer can operate It executes at 730 and is segmented again, to be dynamically generated and send RLC PDU.Rlc layer can identify RLC by RLC state report The ACK/NACK's as a result, identify map information at operation 1370 of serial number, and determine the ACK/ of corresponding PDCP serial number NACK result.If identifying the ACK of PDCP serial number, the ACK information of PDCP serial number can be transmitted to PDCP layers by rlc layer. PDCP layers can identify ACK information, and ACK information can be used and abandon corresponding PDCP PDU from the 4th buffer.

Therefore, in the efficient buffering being applicable in when LTE system terminal operates under RLC AM mode according to the disclosure In the 3rd embodiment of device management method, rlc layer can abandon the information about the RLC PDU that RLC ACK has been received with And map information.In addition, if the PDCP PDU that rlc layer notifies to be cascaded to RLC PDU to PDCP layers, then PDCP layers from the 4th Buffer abandons corresponding PDCP PDU, and discharges and abandon corresponding informance and timer.Therefore, even if utilizing small size Buffer quickly empties the 4th buffer, can also efficiently manage buffer, therefore can be with maximum efficiency.

Figure 14 A and Figure 14 B be show according to disclosed in embodiment wherein LTE system terminal managed under RLC UM mode it is slow The diagram of operation that rush device, terminal.

With reference to Figure 14 A, if receiving IP grouping from upper layer, PDCP layers of terminal can operate at operation 1401, In It operates at 1405, PDCP layers of terminal can receive IP grouping, and at operation 1410, and terminal can be by dividing storage address Each IP grouping is stored in the 4th buffer by dispensing IP grouping.In addition, PDCP layers of terminal can drive at operation 1415 It moves and the PDCP for managing each IP grouping abandons timer.If timer expiration, at operation 1420, terminal is slow from the 4th It rushes device and abandons PDCP PDU or PDCP SDU corresponding with timer.If corresponding with timer at operation 1425 PDCP PDU is sent to rlc layer, then at operation 1430, PDCP layers can will discarding indicator corresponding with PDCP PDU It is sent to rlc layer.Abandoning indicator can indicate that the PDCP PDU serial number for being sent to rlc layer or the mapping about PDCP PDU are believed Breath.

In addition, if receiving the ACK/NACK about PDCP PDU from the PDCP layer of receiving end by PDCP state report Information then can abandon the PDCP PDU confirmed from the 4th buffer for PDCP layers, and if there is the PDCP PDU with discarding Corresponding not expired timer, then at operation 1420, PDCP layers can stop and abandon timer.In addition, if from RLC Layer sends RLC PDU, and the information about the PDCP PDU for being cascaded to transmitted RLC PDU is transmitted to PDCP by rlc layer Layer, then the PDCP layers of information that can be abandoned from the 4th buffer about transmitted PDCP PDU, and if corresponding timer Do not expire, then can discharge and abandon timer for PDCP layers.

With reference to Figure 14 B, terminal rlc layer can operate at operation 1435.If received at operation 1440 from PDCP layers To indicator is abandoned, then terminal rlc layer 1435 can abandon corresponding with the discarding indicator received at operation 1440 Information.Specifically, if at operation 1445, PDCP PDU corresponding with indicator is abandoned becomes in rlc layer not yet A part of RLC PDU is mapped to thereon not yet, then at operation 1455, terminal rlc layer abandons corresponding informance.It loses The content for abandoning indicator is passed to rlc layer, and the discarding of terminal rlc layer is related to PDCP PDU (the RLC SDU) stored Information and map information.If the PDCP PDU indicated by discarding indicator has become RLC PDU at operation 1445 A part, then operation 1450 at, terminal rlc layer does not abandon information relevant to PDCP PDU.

Rlc layer can receive uplink grant, and can configure RLC by the cascade and segmentation of PDCP PDU PDU.After completing RLC PDU at operation 1440 and passing it to MAC layer, at operation 1460, rlc layer abandons and RLC The relevant information of PDU and map information.Under RLC UM mode, rlc layer sends RLC PDU, then abandons relevant information (such as If fruit has), without storing them.This is because not supporting ARQ function under RLC UM mode, therefore it is not necessarily to record and uses In the information of re-transmission.In addition, rlc layer can be determined and be transmitted transmitted by being cascaded to PDCP layers at operation 1465 The information of the PDCP PDU of RLC PDU, and the information can be used to manage the 4th buffer.

Therefore, in the efficient buffer management method being applicable in when LTE system terminal operates under RLC UM mode In 3rd embodiment, rlc layer sends RLC PDU, then abandons relevant information (if any), without storing corresponding RLC PDU.In addition, rlc layer can send PDCP layers for the information about the PDCP PDU for being cascaded to RLC PDU.Even if PDCP is fixed When device do not expire, PDCP layers also can abandon information about PDCP PDU from the 4th buffer immediately.

The buffer structure of next generation mobile communication system and re-transmission accelerate.

In the preceding part of the disclosure, it has been suggested that and describe method for efficiently managing buffer in LTE system. In the remainder of the disclosure, propose for efficiently managing buffer in next generation mobile communication system and accelerating to retransmit Structures and methods.

Figure 15 A and Figure 15 B are at the data shown in next generation mobile communication system according to an embodiment of the present disclosure Manage the diagram of structure.

With reference to Figure 15 A and Figure 15 B, next generation mobile communication system executes PDCP layers and rlc layer data for logic channel Processing.That is, logic channel 1 1505 and logic channel 2 1510 have different PDCP layer and rlc layer, and execute Independent data processing.In addition, the RLC that next generation mobile communication system will be generated from the rlc layer 1515 of each logic channel PDU is transmitted to MAC layer 1520, to configure a MAC PDU, and sends receiving end for MAC PDU.It is mobile logical in the next generation In letter system, PDCP layers, rlc layer and MAC layer may include function as with reference to Figure 4 described above, and can execute and the function It can corresponding operation.

In next generation mobile communication system, which is characterized in that rlc layer does not cascade PDCP PDU.In addition, being moved in the next generation In dynamic communication system, the MAC PDU structure of such as appended drawing reference 1525 is characterized by having having for each MAC SDU The structure of MAC sub-header, in other words, wherein MAC sub-header duplicate structure as unit of MAC SDU.Therefore, in the next generation In mobile communication system, at operation 1530, data prediction can be executed before receiving uplink grant.

For example, the terminal of next generation mobile communication system can receive uplink if PDCP layers receive IP grouping It is directed to the received IP grouping of institute before link authorization and executes PDCP processing (encryption) and integrity protection, and generation can be passed through PDCP header generates PDCP PDU.In addition, terminal can be configured and PDCP PDU is transmitted to rlc layer RLC header come RLC PDU is configured, and MAC sub-header and MAC SDU can be pre-configured by the way that RLC PDU is transmitted to MAC layer.

If terminal receives uplink grant at operation 1530, it can be by making MAC sub-header and MAC SDU Reach the degree of the size of matching uplink grant to configure MAC PDU.On the contrary, if uplink grant is insufficient, eventually End can execute staged operation, to fill up and to efficiently use transfer resource.At operation 1540, terminal can update and divide The corresponding RLC header of data (information or length information of segmentation) and MAC header of section (L field, length change).Therefore, Compared with LTE system, if it is assumed that receiving uplink grant simultaneously, such as operate 1530 and operation 1545, then it is next-generation Mobile communication system can have big gain, such as appended drawing reference 1535 on the processing time.If desired, if It is configured in network, then a public serial number can be used in rlc layer and PDCP layers.

Pretreatment can be executed for each logic channel, and each logic channel can will be directed in advance by MAC layer The RLC PDU of reason is pre-processed again as MAC SDU and MAC sub-header.In addition, if MAC layer receives uplink at operation 1530 Link authorization, then terminal can by for each logical channel assignment uplink grant come be multiplexed pre-generatmg MAC SDU and MAC sub-header.

After MAC layer receives uplink grant from base station, terminal can execute LCP, and can be directed to and each patrol It collects channel and divides uplink grant.In addition, MAC SDU and MAC that terminal can be generated by being multiplexed with each logic channel MAC PDU is transmitted to physical layer to configure a MAC PDU by sub-header.If distributing to the upper of each logic channel Uplink grant is insufficient, can be directed to rlc layer demand staging.Therefore, if rlc layer executes staged operation, report can be updated The segment information for including in head.In addition, if the information of update is transmitted to MAC layer again by rlc layer, then MAC layer can update Corresponding MAC header.As described above, next generation mobile communication system have following feature, receive uplink grant it The preceding data processing for starting PDCP layers, rlc layer and MAC layer.

Since next generation mobile communication system has above structure, several RLC PDU can enter a MAC PDU.In In LTE system, since rlc layer has cascade function, so several PDCP PDU be cascaded it is to be communicated to MAC layer one to generate A RLC PDU, and a MAC PDU generally include with the quantity of logic channel as many RLC PDU (in LTE system, The quantity of logic channel is usually about 2 to 4).

However, rlc layer does not have RLC cascade function, therefore a PDCP PDU quilt in next generation mobile communication system It is generated as a RLC PDU.Therefore, a MAC PDU may include the quantity that its quantity corresponds to IP grouping (PDCP PDU) Multiplied by the RLC PDU of the quantity of logic channel.By simple algorithm calculations, in LTE system, a MAC PDU at most may be used To include about 4 RLC PDU, and in next generation mobile communication system, a MAC PDU may include no less than 500 RLC PDU.Therefore, in next generation mobile communication system, if a MAC PDU loses, it is therefore necessary to retransmit hundreds of RLC PDU.Therefore, rlc layer should retransmit hundreds of RLC PDU, this may cause serious transmission delay.Therefore, in the disclosure, Propose the structures and methods that can accelerate to retransmit in next generation mobile communication system.

In next generation mobile communication system, rlc layer can be in RLC affirmation mode (RLC AM), RLC unacknowledged mode It is operated under (RLC UM) and RLC transparent mode (RLC TM).Under RMC AM mode, rlc layer supports ARQ function, and transmitting terminal can To receive RLC state report from receiving end, and the RLC PDU that state report retransmits negative confirmation can be used in transmitting terminal.Cause This, ensure that faultless reliable data transmission.Therefore, RLC AM mode is suitable for requiring the service of high reliability.

On the contrary, not supporting ARQ function under RLC UM mode.Therefore, under RLC UM mode, transmitting terminal is not from reception End receives RLC state report, and does not execute functions of retransmission.Under RLC UM mode, if receiving uplink grant, hair The rlc layer of sending end is for cascading from the received PDCP PDU in upper layer (RLC SDU) and being continuously transmitted to cascade PDCP PDU Lower layer.Therefore, the continuous data transmission of no transmission delay is possibly realized, therefore RLC UM mode is for transport latency sensitive Service is useful.Under RLC TM mode, rlc layer will be sent directly to lower layer from the received PDCP PDU in upper layer, without holding Any process of row.Under the TM mode of rlc layer, the data from upper layer are pellucidly transmitted to lower layer from rlc layer.Therefore, when It sends when the system information or paging message that the common signal channel of such as CCCH is sent, RLC TM mould can be efficiently used Formula.

In the disclosure, efficient buffer management method is handled with rlc layer and retransmits accelerated method for PDCP layers, therefore existing Will be described in exclude wherein rlc layer do not execute any processing mode (such as RLC TM mode) RLC AM mode and RLC UM mode.

The buffer structure at RLC AM/TM of next generation mobile communication system and retransmitting accelerates.

Figure 16 is to show next generation's mobile communication system terminal according to an embodiment of the present disclosure of working as in RLC AM mode The diagram of the mapping table and re-transmission accelerated method that are applicable in when lower operation.

With reference to Figure 16, terminal has the 5th buffer and hex buffer for each logic channel.It rises for convenience See, Figure 16 explains a logic channel.The 5th buffer and hex buffer of logical channel, which can be, physically to be divided Buffer, or buffer that is physically identical but dividing in logic.Preferably, the 5th buffer can be PDCP buffer, And hex buffer can be MAC buffer.In the disclosure, when actual implementation, buffer includes physically or logic On the buffer structure that can divide.

Terminal can store IP grouping (the PDCP SDU) 1610 into PDCP layers, and the report of PDCP SDU can be generated Head.In addition, terminal can generate PDCP PDU 1615 by configuring header generated together with PDCP SDU, it will They are stored in the 5th buffer 1605.In addition, terminal can execute data before receiving uplink grant from base station Pretreatment.Specifically, at operation 1625, terminal can be by generating RLC header for the PDCP PDU in the 5th buffer RLC PDU 1620 is configured, configures MAC sub-header for RLC PDU (MAC SDU), and by MAC SDU and MAC sub-header It is collectively stored in hex buffer 1630.However, if all PDCP PDU are pretreated into MAC SDU and MAC sub-header, Then hex buffer may need large capacity.Therefore, in the disclosure, the data prediction of PDCP PDU can be only performed to By maximum transmitted block (TB) size of terminal and network support.

For example, terminal can be with preprocessed data, until the sum of the size of MAC SDU and the MAC sub-header of data prediction (this is because the size of PDECP PDU is variable, therefore MAC SDU and MAC sub-header at the time of more than maximum TB size The sum of size may be not of uniform size with maximum TB).In addition, terminal can be only by data prediction to close maximum TB size Degree.For example, if MAC SDU and the MAC sub-header (being stored for being sent to hex buffer) of data prediction it is big Small close as maximum TB size, then terminal can no longer execute data prediction.

If generating RLC PDU during data prediction, terminal can distribute RLC serial number, and pretreatment constitutes RLC Storage address 1655 and with RLC PDU corresponding MAC SDU and MAC report of the PDCP PDU of PDU in the 5th buffer Head, and the storage address of hex buffer 1660 is stored in mapping table 1650.If it is necessary, terminal can store correspondence PDCP serial number.However, if PDCP serial number is identical with RLC serial number, can be omitted in next generation mobile communication system PDCP serial number or RLC serial number.In addition, in next generation mobile communication system, even if PDCP layers use a public sequence with rlc layer Number, it also can be omitted PDCP serial number or RLC PDCP serial number.

If receiving uplink grant, terminal will be upper by the priority or QoS for reflecting each logic channel Uplink grant is distributed to each logic channel.If receiving uplink grant 1635, terminal has passed through since making data It is that unit reaches the degree corresponding to uplink grant and configures MAC from the MAC sub-header and MAC SDU of hex buffer A part of PDU 1645.In addition, being directed to other logic channels, terminal can be received by the above process by being multiplexed MAC sub-header 1640 and MAC SDU complete a MAC PDU 1645, and can send physical layer for MAC PDU.

If when data are added to uplink as unit of MAC sub-header and MAC SDU for each logic channel When authorization, MAC sub-header and the size of MAC SDU are inaccurate consistent each other, then rlc layer can be directed to become with it is not of uniform size The last one RLC SDU execute staged operation.If performing segmentation for RLC SDU, rlc layer can be by segment information Newly input and update the header of RLC PDU.In addition, for the RLC PDU completed, MAC layer can newly update new MAC report Head, and MAC sub-header and MAC SDU can be configured to match uplink grant.

If rlc layer executes staged operation as described above, at operation 1665, about the header for staged operation The information of field can be recorded in the mapping table.However, can be omitted such record if unnecessary.As described above RLC SDU staged operation be characterized in that so that segmentation RLC PDU have segment information field and include instruction be segmented pair Should be in the field of the offset where of original RLC SDU, wherein the instruction of segment information field is kept in the RLC PDU of segmentation In the state of identical RLC serial number, the segmentation of segmentation is first segmentation, medial section or last segmentation.

If identifying ACK/NACK by the received RLC state report of rlc layer from receiving end, in operation 1670 Place, terminal can record the information in the mapping table.The RLC PDU of negative confirmation is retransmitted if necessary, then transmitting terminal Rlc layer can access elder generation corresponding with RLC PDU by using the storage address information of hex buffer in mapping table 1650 The storage address of preceding generation and MAC SDU and the MAC sub-header sent retransmits to be immediately performed.If uplink grant is enough Greatly to include that it retransmits all RLC PDU that should be performed, then can be used the MAC SDU being stored in hex buffer and MAC sub-header executes re-transmission.On the contrary, if uplink cannot include that it retransmits all RLC PDU that should be performed, Rlc layer executes staged operation for the last one MAC SDU (RLC PDU), RLC header and MAC layer execute update MAC header with Execute the process retransmitted.In addition, if needing once to retransmit several continuous RLC PDU, then terminal can be by using mapping The storage address of hex buffer executes Fast retransmission with small memory access in table 1650.For example, can be by reference to The end link of the beginning link and the last one RLC PDU of first RLC PDU in several continuous RLC PDU, one It is secondary to introduce several RLC PDU from hex buffer to configure MAC PDU.For example, if necessary to retransmit RLC serial number 1 to 6, then eventually End can identify the storage address 1655 of hex buffer from mapping table 1650, and with reference to the 6th buffering for RLC serial number 1 The end link m of starting link p and the RLC serial number 6 of device executes re-transmission to m using the storage address 0 of hex buffer.

In the height being applicable in when the terminal of next generation mobile communication system operates under RLC AM mode that the disclosure proposes In the buffer management method of effect and the fourth embodiment of re-transmission accelerated method, terminal can store in hex buffer The MAC sub-header and MAC SDU of the data prediction for the PDCP PDU being stored in the 5th buffer are performed for it, and Mapping table can be configured based on RLC serial number to manage them.In addition, in the fourth embodiment, re-transmission is executed if necessary, It is characterized in that, using re-transmission is immediately performed by the map information of pre-generatmg and storage in hex buffer, without Regenerate RLC header and MAC sub-header.

Therefore, even if terminal can also it is necessary to execute the re-transmission of hundreds of RLC PDU in next generation mobile communication system To use map information Fast retransmission by data prediction and the RLC PDU that is stored in hex buffer, without new Configure hundreds of RLC headers and MAC sub-header.If staged operation is necessary each logic channel, one is only updated RLC header and a MAC header corresponding with the last one MAC SDU are with regard to enough, therefore transmission delay substantially reduces.

The operation of 5th buffer and hex buffer is as follows.

If having received IP grouping from upper layer, PDCP layers can be by will be each to IP grouping by allocations of storage addresses A IP grouping is stored in the 5th buffer 1605.In addition, PDCP layers can drive and manage the PDCP of each IP grouping to abandon Timer.Timer value can be by network configuration.For example, timer value can be passed through by network when terminal configures RRC connection RRC information and configure.If timer expiration, terminal from the 5th buffer abandon PDCP PDU corresponding with timer or PDCP SDU.If PDCP PDU corresponding with timer is sent to rlc layer, PDCP layers will be corresponding with PDCP PDU Discarding indicator be sent to rlc layer.The PDCP PDU serial number for being sent to rlc layer can be indicated or about PDCP by abandoning indicator The map information of PDU.

In addition, if receiving the ACK/NACK about PDCP PDU from the PDCP layer of receiving end by PDCP state report Information then can abandon the PDCP PDU confirmed from the 5th buffer for PDCP layers.In addition, if the PDCP PDU with discarding is opposite The not expired timer answered exists, then it can stop and abandon timer.In addition, PDCP layers can from rlc layer receive about The information of PDCP PDU corresponding with the RLC PDU of RLC ACK has been received.Since PDCP PDU means them It is successfully delivered to receiving end, so no longer it is necessary to be stored in the 5th buffer.Therefore, it corresponding informance and reflects Firing table information can be dropped, and if there is not expired timer, timer can also be stopped and abandon.It is being based on RLC ACK in the case where managing the 5th buffer, differently manages during switching according to the PDCP layer operation of terminal Five buffers are important.

As the first situation, terminal can use network configuration to execute PDCP layer operation, wherein in the network configuration In, during switching, after up to the present minimum PDCP serial number is delivered successfully in order, PDCP layers should be again to switching Target BS retransmit PDCP PDU.In this case, if receive about with RLC that RLC ACK has been received The information of the corresponding PDCP PDU of PDU then should store and be received sequentially all ACK according to PDCP serial number for PDCP layers Minimum PDCP serial number.In addition, for the PDCP serial number higher than minimum PDCP serial number, even if RLC has been received in rlc layer ACK, PDCP layers should not also abandon them.That is, having been based on RLCACK identifies its PDCP PDU being delivered successfully It can only be abandoned according to the sequence of its PDCP serial number.For example, even if identifying that PDCP serial number 1,2,3,4,5,9 and 10 has succeeded Ground from the RLC ACK of rlc layer transmit, also can only from the 5th buffer abandon PDCP serial number 1,2,3,4 and 5 and with it is corresponding The relevant information of PDCP PDU and map information.

As second situation, terminal can use network configuration to execute PDCP layer operation, wherein in the network configuration In, PDCP layers selectively should retransmit the PDCP PDU being up to the present not yet delivered successfully to the target BS of switching.In In this case, if receiving the information about the PDCP PDU for being cascaded to the RLC PDU that RLC ACK has been received, PDCP layers can abandon information corresponding with PDCP PDU and map information from the 5th buffer, and can individually store About the information for the PDCP serial number for receiving ACK in order, to use the information during switching.

If receiving discarding indicator from PDCP layers, with abandon the corresponding PDCP PDU of indicator not yet at For RLC PDU a part, there are no execute data prediction or PDCP PDU using MAC PDU and MAC sub-header not having also In the state of being mapped to thereon, rlc layer can abandon corresponding informance.For example, rlc layer abandons and is transmitted to and is stored in The relevant information of PDCP PDU (RLC SDU) and map information in rlc layer.If the PDCP indicated by discarding indicator PDU has become a part of RLC PDU, then the case where having utilized MAC SDU and MAC sub-header to execute data prediction Under, rlc layer does not abandon information relevant to PDCP PDU.This is because if having become the PDCP of a part of RLC PDU PDU is dropped, and will appear gap in RLC serial number, so as to cause transmission delay.

Receiving end cannot distinguish that corresponding RLC serial number loses in transmission process or passes through discarding in transmitting terminal Indicator and abandon.If receiving RLC state report from the rlc layer of receiving end, rlc layer can identify each RLC serial number ACK/NACK result.In addition, rlc layer can abandon mapping table related to this in the case where the RLC PDU of confirmation 1650.Rlc layer transmits information about PDCP PDU corresponding with the RLC PDU of confirmation, and from storage confirmation it is pre- from The hex buffer of the RLC PDU of reason abandons corresponding MAC sub-header and MAC SDU.

In the case where the RLC PDU of negative confirmation, rlc layer prepares its re-transmission.If in the case where executing re-transmission Uplink grant is enough, then map information can be used with reference to MAC sub-header and MAC from hex buffer in rlc layer SDU executes re-transmission.In addition, if uplink grant is insufficient, then rlc layer can be for the MAC report in hex buffer Head and MAC SDU in the RLC SDU of the last one be segmented again to execute, and can update and retransmit RLC header and MAC header.

Rlc layer can be identified by RLC state report RLC serial number ACK/NACK's as a result, identification map information (1670), and the ACK/NACK result of corresponding PDCP serial number is determined.If identifying the ACK of PDCP serial number, rlc layer can The ACK information of PDCP serial number is transmitted to PDCP layers.PDCP layers can identify ACK information, record each PDCP serial number ACK/NACK information, and abandon using ACK information the PDCP PDU of the 5th buffer.The ACK information of PDCP serial number can be with It is used during switching.When terminal switches out now, the re-transmission of the PDCP layers of target BS that can go to switching, from Start according to the PDCP serial number of serial number being received sequentially after the minimum PDCP serial number of all ACK.If network support switches The selective retransmission of period, then PDCP layers can only to the target BS of switching retransmit negative confirmation PDCP PDU.

In the height being applicable in when the terminal of next generation mobile communication system operates under RLC AM mode that the disclosure proposes In the buffer management method of effect and the fourth embodiment of re-transmission accelerated method, which is characterized in that the 5th buffer is not by PDCP Layer independently manages, but manages the 5th buffer and hex buffer by reflecting the RLC ACK result of rlc layer.In addition, When the terminal of next generation mobile communication system operates under RLC UM mode be applicable in efficient buffer management method and In the fourth embodiment for retransmitting accelerated method, which is characterized in that the 5th buffer is not managed independently by PDCP layers, but is passed through Reflect whether to send the RLC PDU in rlc layer to manage the 5th buffer and hex buffer.

If from receiving end, RLC equipment receives RLC state report under RLC AM mode, and receives RLC PDU ACK, then RLC equipment no longer it is necessary to have information corresponding with the RLC PDU of confirmation and map information, and It is reasonable that RLC equipment, which abandons them from the 5th buffer,.In addition, if corresponding with the RLC PDU of ACK has been received PDCP PDU is present in the 5th buffer, and MAC SDU and the MAC sub-header of data prediction is present in hex buffer In, then such information is not used in re-transmission, therefore even if PDCP abandons timer and not yet expires, also no longer it is necessary to have for rlc layer There are them.Therefore, it is being applicable in when being operated under RLC AM mode according to the terminal of the next generation mobile communication system of the disclosure Efficient buffer management method and retransmit accelerated method fourth embodiment in, which is characterized in that rlc layer is lost from mapping table The information about the RLC PDU that RLC ACK has been received is abandoned, notifies PDCP PDU corresponding with RLC PDU to PDCP layers, Corresponding PDCP PDU is abandoned from the 5th buffer, the MAC subheader and MAC SDU of data prediction are abandoned from hex buffer, It discharges and abandons corresponding informance and timer.

When the terminal of the next generation mobile communication system according to the disclosure with structure as shown in figure 16 is in RLC UM The fourth embodiment of applicable efficient buffer management method is as follows when operating under mode.

When being operated under RLC UM mode, according to the terminal of the disclosure have structure as shown in figure 16, and with It is operated above with reference to the similar mode of the mode of Figure 16 description.However, being different from RLC AM mode, do not propped up under RLC UM mode ARQ function is held, therefore does not execute re-transmission.In addition, not executing RLC state report.Therefore, transmitting terminal is not necessarily to record and send out The RLC PDU or relevant information that send and the map information for re-transmission.This is between RLC UM mode and RLC AM mode Maximum difference.That is, in the case where completing transmission, it is not necessary that pass through PDCP PDU, the MAC SDU for re-transmission RLC PDU is stored with the data prediction of MAC sub-header.

In the disclosure, wherein under RLC UM mode, the terminal of next generation mobile communication system efficiently manage buffer Method fourth embodiment it is as follows.

If having received IP grouping from upper layer, PDCP layers can be by will be each to IP grouping by allocations of storage addresses A IP grouping is stored in the 5th buffer 1605.In addition, PDCP layers can drive and manage the PDCP of each IP grouping to abandon Timer.Timer value can be by network configuration.For example, timer value can be passed through by network when terminal configures RRC connection RRC information and configure.If timer expiration, terminal from the 5th buffer abandon PDCP PDU corresponding with timer or PDCP SDU.If PDCP PDU corresponding with timer is sent to rlc layer, PDCP layers can will be with PDCP PDU phase Corresponding discarding indicator is sent to rlc layer.Abandon indicator can indicate the PDCP PDU serial number for being sent to rlc layer or about The map information of PDCP PDU.In addition, if being received from the PDCP layer of receiving end about PDCP by PDCP state report The ACK/NACK information of PDU then can abandon the PDCP PDU confirmed from the 5th buffer for PDCP layers.In addition, if with discarding The corresponding not expired timer of PDCP PDU exist, then can stop and abandon timer for PDCP layers.

If receiving discarding indicator from PDCP layers, with abandon the corresponding PDCP PDU of indicator not yet at For the RLC PDU in rlc layer a part or not yet be mapped to thereon in the state of, rlc layer can abandon corresponding letter Breath.For example, rlc layer abandons and is transmitted to and is stored in the PDCP PDU in rlc layer (RLC SDU) relevant information and mapping Information.If the PDCP PDU indicated by discarding indicator has become a part of RLC PDU, rlc layer do not abandon with by Abandon the relevant information of PDCP PDU of indicator instruction.This is because if having become the PDCP of a part of RLC PDU PDU is dropped, and will appear gap in RLC serial number, so as to cause transmission delay.Receiving end cannot distinguish that corresponding RLC serial number is That loses in transmission process is still abandoned in transmitting terminal by abandoning indicator.

Rlc layer can be by configuring RLC to the data prediction of PDCP PDU before receiving uplink grant PDU, and complete RLC PDU and pass it to MAC layer, MAC sub-header and MAC SDU are stored in hex buffer In.Complete RLC PDU and after passing it to MAC layer, rlc layer abandon information relevant to RLC PDU, map information, MAC sub-header and MAC SDU.In other words, under RLC UM mode, rlc layer send RLC PDU, then by they to it is related Information (if any) abandons together, without storing them.This is because ARQ function is not supported under RLC UM mode, because This is not necessarily to information of the record for re-transmission.

Under RLC UM mode, ARQ function is not supported, therefore is not necessarily to store after RLC PDU is sent and be corresponded to Information is for retransmitting.Therefore, after sending RLC PDU, rlc layer do not stored in hex buffer corresponding RLC PDU, MAC sub-header, MAC SDU and relevant mapping information, but abandon relevant information (if any).In addition, once having sent RLC PDU, even if PDCP abandons timer and not yet expires, also no longer it is necessary to have PDCP corresponding with RLC PDU for rlc layer PDU。

Therefore, in the efficient buffering being applicable in when being operated under RLC UM mode according to the LTE system terminal of the disclosure In the fourth embodiment of device management method, after sending RLC PDU, rlc layer can not be by corresponding RLC PDU, MAC report Head and MAC SDU are stored in hex buffer and mapping table, but can abandon relevant information and map information (if there is Words).In addition, the information about PDCP PDU corresponding with RLC PDU is sent to PDCP layers, and even if PDCP timer Not yet expiring, PDCP layers also abandon the information about PDCP PDU from the 5th buffer,.

Terminal data pretreatment and re-transmission.

Process of data preprocessing can be applied to next generation mobile communication system by embodiment above disclosured. Process of data preprocessing can it is big as the data volume that can be sent to the maximum extent in a TTI or primary transmission and It executes.That is, can as many execute data prediction with maximum allowable UL authorization or maximum UL authorization.In addition, holding The time of line number Data preprocess may include one of following situations or a variety of.

1. if data are located in advance the amount of current pretreated data becomes smaller than maximum allowable UL authorization as described above Reason can be performed.

2. data prediction can be periodically carried out based on specific time.

3. when MAC layer is configured MAC PDU and is passed data to physical layer using uplink grant, data prediction It can be performed.

4. data prediction can be performed after sending new data.

5. if data receiver can be performed receive the indicator for executing data prediction from lower layer.

At one in above-mentioned time point, terminal can execute data prediction.In addition, if it is necessary to terminal can To execute data prediction according to several time points as described above.

In the case where RLC controls the PDU of dynamic generation in rlc layer, for example, generating RLC state report (RLC shape State PDU) in the case where, terminal can firstly generate RLC state report at the time that data prediction is performed, and can be with Data prediction is executed for RLC state report prior to other general RLC PDU.In addition, terminal, which can also be directed to, to be weighed The RLC PDU of biography preferentially executes data prediction.

That is, terminal can be according to RLC state report, re-transmission at the time that above-mentioned data prediction is performed Data RLC PDU and data RLC PDU sequence execute data prediction.

Terminal is segmented execution method.

In above process, it is necessary to further specify that terminal executes the process of segmentation.That is, if being in terminal Uplink grant is received in the state of the pretreated MAC SDU of each logic channel storing data and MAC sub-header, then eventually End is it is considered that priority of logical channels, priority bit rate (Priority Bit Rate, PBR), numerology and TTI value And LCP process is executed, and can be each logical channel assignment uplink grant.If when being each logical channel assignment When uplink grant, the integer of the sum of MAC SDU and MAC sub-header unit of data prediction is more than uplink grant, Then it may be necessary to executing segmentation.

The first embodiment of segmentation is as follows.

In the first embodiment, rlc layer can store the RLC PDU for being transmitted to MAC layer for segmentation.MAC layer can be with It will be for the sum of MAC SDU and MAC the sub-header unit of the uplink grant of each logical channel assignment and data prediction Integer is compared, and if uplink grant is insufficient, MAC layer can will about with the last one MAC SDU (RLC PDU) information of corresponding RLC serial number is transmitted to rlc layer.Rlc layer can be directed to RLC corresponding with the RLC serial number of transmitting PDU executes segmentation, and the RLC PDU of segmentation can be segmented and be transmitted to MAC layer.

MAC layer can be for the RLC PDU segmented configuration MAC sub-header of transmitting, and can execute data-reusing or grade Connection is to match uplink grant.Rlc layer can execute data prediction and segmentation according to uplink grant, and at this In the case of kind, rlc layer (considers the field that can be added to the addition of RLC header, such as divides in view of the size of RLC header Field offset (Segmentation Offset, SO) field) and MAC sub-header to be updated later size and execute point Section, to match the size of the uplink grant for each logical channel assignment.

The second embodiment of segmentation is as follows.

In a second embodiment, rlc layer can not store the RLC PDU for being transmitted to MAC layer for segmentation.MAC layer can Will be the sum of uplink grant and MAC SDU and MAC the sub-header unit of data prediction of each logical channel assignment Integer be compared, and if uplink grant is insufficient, MAC layer can will about with the last one MAC SDU The information of (RLC PDU) corresponding RLC serial number is transmitted to rlc layer.Rlc layer can be used map information and be based on PDCP PDU It dynamically regenerates the corresponding RLC PDU of RLC serial number with transmitting, executes segmentation for RLC PDU generated, and And by the RLC of segmentation PDU sections be transmitted to MAC layer.MAC layer can be directed to the RLC PDU segmented configuration MAC sub-header of transmitting, and And data-reusing or cascade can be executed to match uplink grant.Rlc layer can execute number according to uplink grant Data preprocess and segmentation, and in this case, rlc layer (considers that RLC can be added in view of the size of RLC header The field of the addition of header, such as SO field) and MAC sub-header to be updated later size and execute segmentation, with Size with the uplink grant for each logical channel assignment.

The 3rd embodiment of segmentation is as follows.

In the third embodiment, rlc layer can not store the RLC PDU for being transmitted to MAC layer for segmentation.MAC layer can Will be the sum of uplink grant and MAC SDU and MAC the sub-header unit of data prediction of each logical channel assignment Integer be compared, and if uplink grant is insufficient, MAC layer can be by the last one MAC SDU (RLC PDU) It is transmitted to rlc layer.Then, rlc layer can execute segmentation for the RLC PDU of transmitting, and can be by the RLC PDU of segmentation points Section is transmitted to MAC layer.MAC layer can be for the RLC PDU segmented configuration MAC sub-header of transmitting, and it is multiple to execute data With or cascade to match uplink grant.Rlc layer can execute data prediction and segmentation according to uplink grant, and And in this case, rlc layer in view of RLC header size (consider can be added to RLC header addition field, Such as SO field) and MAC sub-header to be updated later size and execute segmentation, with matching for each logic channel point The size for the uplink grant matched.

The fourth embodiment of segmentation is as follows.

In the fourth embodiment, rlc layer can not store the RLC PDU for being transmitted to MAC layer for segmentation.MAC layer can Will be the sum of uplink grant and MAC SDU and MAC the sub-header unit of data prediction of each logical channel assignment Integer be compared, and if uplink grant is insufficient, mapping table is can be used by the last one MAC in MAC layer The map information (for example, storage address) of SDU (RLC PDU) is transmitted to rlc layer.Then, rlc layer can be used map information and draw The RLC PDU for entering storage executes segmentation for RLC PDU, and the RLC PDU of segmentation can be segmented and be transmitted to MAC layer. MAC layer can be for the RLC PDU segmented configuration MAC sub-header of transmitting, and can execute data-reusing or cascade to match Uplink grant.

Rlc layer can execute data prediction and segmentation according to uplink grant, and in this case, RLC Layer in view of RLC header size (considering the field that can be added to the addition of RLC header, such as SO field) and later The size of MAC sub-header to be updated and execute segmentation, to match the uplink grant for being each logical channel assignment Size.

5th embodiment of segmentation is as follows.

In the 5th embodiment, rlc layer can not store the RLC PDU for being transmitted to MAC layer for segmentation.MAC layer can Will be the sum of uplink grant and MAC SDU and MAC the sub-header unit of data prediction of each logical channel assignment Integer be compared, and if uplink grant is insufficient, mapping table is can be used by the last one MAC in MAC layer The map information (for example, storage address) of SDU (RLC PDU) is transmitted to rlc layer.Then, the mapping of transmitting can be used in rlc layer Information regenerates RLC PDU based on PDCP PDU, executes segmentation for RLC PDU, and can be by the RLC PDU of segmentation Segmentation is transmitted to MAC layer.MAC layer can be for the RLC PDU segmented configuration MAC sub-header of transmitting, and can execute data Multiplexing is cascaded to match uplink grant.

Rlc layer can execute data prediction and segmentation according to uplink grant, and in this case, RLC Layer in view of RLC header size (considering the field that can be added to the addition of RLC header, such as SO field) and later The size of MAC sub-header to be updated and execute segmentation, to match the uplink grant for being each logical channel assignment Size.

Terminal data for multi-connection pre-processes execution method.

In order to execute data prediction in multi-connection or dual link environment, it is main plot that terminal, which should can predefine, Group or secondary cell group will send PDCP layers of data.That is, due to needing to distribute RLC sequence in process of data preprocessing Number, so should predefine assorted one cell group will execute transmission, to execute data prediction.In dual link environment, use It is as follows in the method that PDCP layer data is pre-assigned to main plot group and secondary cell group.

Figure 21 is to show the method according to an embodiment of the present disclosure for pre-processing the data of multi-connection terminal to show Figure.

1. the first distribution method at operation 2101: if PDCP layers of data volume is less than predetermined threshold, terminal will not PDCP layers of data are pre-assigned to main plot group and secondary cell group.Data in threshold value are only in main plot group (or secondary cell group) It is pretreated.In addition, if PDCP layers of data volume becomes larger than threshold value, then terminal is not directed to its amount and holds greater than the data of threshold value Line number Data preprocess, but buffer state report is executed to main plot group and secondary cell group for PDCP layers of current data amount It accuses.In addition, if receive uplink grant for each cell group, then terminal can be according to uplink grant by PDCP Layer data distributes to main plot group and secondary cell group, and can execute data prediction to send data.Threshold value can be divided With the value for that can indicate low data rate or small data, and quilt when RRC connection configures can be executed in network (or base station) Configuration.

2. (1-1) distribution method at operation 2102: if PDCP layers of data volume is less than predetermined threshold, terminal is not PDCP layers of data are pre-assigned to main plot group and secondary cell group.Data in threshold value are only in main plot group (or secondary cell group) In be pretreated.In addition, if PDCP layers of data volume becomes larger than threshold value, then terminal can be pre-processed only for main plot group With the data of threshold value as many, and buffer shape can be executed to main plot group and secondary cell group for the data more than threshold value State report.In addition, if receiving uplink grant for each cell group, then terminal can be incited somebody to action according to uplink grant PDCP layer data distributes to main plot group and secondary cell group, and can execute data prediction to send data.Threshold value can be with It is assigned to indicate the value of low data rate or small data, and RRC connection configuration can be executed in network (or base station) When be configured.

3. (1-2) distribution method at operation 2103: if PDCP layers of data volume is less than predetermined threshold, terminal is not PDCP layers of data are pre-assigned to main plot group and secondary cell group.Data in threshold value are only in main plot group (or secondary cell group) In be pretreated.In addition, if PDCP layers of data volume becomes larger than threshold value, then terminal can for the pretreatment of main plot group with The data of threshold value as many, and the uplink that can be distributed to the maximum extent of secondary cell group and secondary cell group can be directed to The size of authorization as many pre-processes the data more than threshold value.In addition, being directed to remaining data, terminal can execute buffer shape State report, and if receiving uplink grant for each cell group, terminal can be incited somebody to action according to uplink grant PDCP layer data distributes to main plot group and secondary cell group, and can execute data prediction to send data.Threshold value can be with It is assigned to indicate the value of low data rate or small data, and RRC connection configuration can be executed in network (or base station) When be configured.

4. the second distribution method at operation 2104: if PDCP layers of data volume is less than predetermined threshold, terminal will not PDCP layers of data are pre-assigned to main plot group and secondary cell group.Data in threshold value are only in main plot group (or secondary cell group) It is pretreated.In addition, if PDCP layers of data volume becomes larger than threshold value, then terminal can be according to being configured by network or base station Particular separation is than being pre-assigned to main plot group and secondary cell group (or for as threshold value for PDCP layers of current overall data More data execute data prediction to main plot group, and for the data more than threshold value, will count according to particular separation ratio After being pre-assigned to main plot group and secondary cell group, data prediction is executed).In addition, terminal can for the data of predistribution To execute data prediction to each cell group before each cell group is assigned uplink grant.When RRC connection is matched When setting by network (or base station) execution, threshold value can be configured as the value that can indicate low data rate or small data, and work as Network (or base station) executes RRC in view of network and base station resource situation and connect when configuring, and specific ratios can be configured.

In the disclosure, the terminal in dual link environment can by application one of four kinds of methods as described above come Execute data prediction.

Wherein the PDCP layer of terminal is determined data volume based on threshold value and data is pre-assigned to main plot group and auxiliary small The process of district's groups can start at one or more time points as described below.

1. when being intended to become smaller than the uplink that can be distributed to the maximum extent in the amount of current pretreated data When executing data prediction in the state of warrant quantity

2. periodically based on Time constant

3. at the time when MAC layer configures MAC PDU using uplink grant and passes data to physical layer

4. after sending new data

5. when receiving the indicator for executing data prediction from lower layer and being intended to execute data prediction

6. whenever receiving new data in PDCP layers

7. when receiving the indicator to main plot group and the execution data distribution of secondary cell group from lower layer

8. when data volume becomes larger than the specific threshold in PDCP layers

When PDCP layers of data volume is compared with threshold value, PDCP layers of data volume can by the following method and It calculates.

1. the first calculation method: this method calculates the number with the PDCP data Layer for not sent and not being pretreated According to not sent but be pretreated in amount, the data volume and secondary cell group that are not sent but be pretreated in the group of main plot The corresponding overall data of the sum of data volume size, and the value of calculating is compared with threshold value.

2. second of calculation method: this method calculates the data of PDCP data Layer for not sent and not being pretreated The size of amount, and the value of calculating is compared with threshold value.

3. the third calculation method: this method, which calculates, not to be sent and is calculated when excluding to be compared with previous threshold The size of data and new received data volume, and the value of calculating is compared with threshold value.

4. the 4th kind of calculation method: this method calculate with the data volume that is not sent but be pretreated in the group of main plot with And the size of the corresponding overall data of the sum of data volume for not sent but being pretreated in secondary cell group, and will calculate Value be compared with threshold value.

Using one of four kinds of methods as described above, can calculate will be by the terminal and threshold value in dual link environment The size of the data for the PDCP layer being compared.

Terminal in dual link environment can will distribute continuous PDCP serial number as rule, so that working as PDCP layers of data When being pre-assigned to main plot group and secondary cell group, each cell group has them to the maximum extent.If PDCP serial number does not have It is separated to each cell group, but is assigned to the group of continuous PDCP serial number, then when the PDCP layer of receiving side rearranges The processing time and burden occurred when the sequence of PDCP serial number can be reduced.

It, can be by that will be used to execute list in the method for the data prediction for executing the terminal in dual link environment The method of the data prediction of terminal in JA(junction ambient) is applied to each cell group to execute data prediction.That is, When in each cell group execute data prediction when, terminal can with maximum transport block size, maximum allowable UL authorization or The size of maximum transmissible data as many executes data prediction in a TTI.That is, although with above-mentioned big It is small as many to execute data prediction, but the maximum data pretreatment gain of data transmission next time can be obtained.

In the method for the data prediction for executing the terminal in dual link environment, threshold value or particular separation ratio can be with End is configured to from base station by RRC information (RRCConnectionSetup or RRCConnectionReconfiguration) End, or can dynamically be reconfigured by RRC information (RRCConnectionReconfiguration).In addition, being The PDCP control PDU that newly defines can be used to update threshold value or particular separation ratio in dynamic allocation threshold value or particular separation ratio.

In the method for the data prediction for executing the terminal in dual link environment, base station it is necessary to configure threshold value, So that threshold value becomes larger than the maximum transport block size of main plot group, maximum allowable UL authorization or maximum can in a TTI The size of data of transmission.This is because making that it becomes larger than maximum transport block size, maximum allowable UL is awarded by configuring threshold value Power or the maximum transmissible size of data in a TTI can obtain the maximum data pretreatment of data transmission next time Gain.

In dual link environment as described above, terminal can configure PDCP layers of data, to be replicated by grouping by it Be sent to different cell groups, and the PDCP control PDU that the configuration can be defined by RRC information or newly is activated or is gone Activation.

Figure 17 A and Figure 17 B are to show wherein next generation mobile communication system terminal according to an embodiment of the present disclosure to exist The diagram of buffer, terminal operation is managed under RLC AM mode.

With reference to Figure 17 A, if receiving IP grouping from upper layer, PDCP layers of terminal can operate at operation 1701, eventually End PDCP layer can operation 1705 at receive IP grouping, and can operate 1710 at by by allocations of storage addresses to IP Each IP grouping is stored in the 5th buffer by grouping.In addition, PDCP layers of terminal can drive and manage at operation 1715 The PDCP for managing each IP grouping abandons timer.If timer expiration, at operation 1720, terminal is lost from the 5th buffer Abandon PDCP PDU or PDCP SDU corresponding with timer.If at operation 1725, PDCP corresponding with timer PDU is sent to rlc layer, then at operation 1730, PDCP layers can be sent discarding indicator corresponding with PDCP PDU To rlc layer.The PDCP PDU serial number for being sent to rlc layer, or the map information about PDCP PDU can be indicated by abandoning indicator. In addition, if receiving the ACK/NACK information about PDCP PDU from the PDCP layer of receiving end by PDCP state report, then PDCP layers can abandon the PDCP PDU confirmed from the 5th buffer.In addition, if in the presence of corresponding with the PDCP PDU of discarding Not expired timer, then operation 1720 at, PDCP layers can stop and abandon timer.

In addition, PDCP layers can receive from rlc layer about the PDCP for being cascaded to the RLC PDU that RLC ACK has been received The information of PDU.Since PDCP PDU means that they have been successfully delivered to receiving end, thus no longer it is necessary to by they It is stored in the 5th buffer, and PDCP layers can abandon them.At operation 1720, the PDCP layers of PDCP for abandoning and abandoning The corresponding information of PDU and map information, and if there is not expired timer, then it can stop and abandon for PDCP layers Timer.Based on RLC ACK to manage five buffers, during switching according to the PDCP layer operation of terminal come Differently the 5th buffer of management is important.

As the first situation, terminal can use network configuration to execute PDCP layer operation, wherein in the network configuration In, during switching, after up to the present minimum PDCP serial number is delivered successfully in order, PDCP layers should be again to switching Target BS retransmit PDCP PDU.In this case, have been received RLC ACK's about being cascaded to if received The information of the PDCP PDU of RLC PDU then should store and be received sequentially all ACK's according to PDCP serial number for PDCP layers Minimum PDCP serial number.In addition, for the PDCP serial number higher than minimum PDCP serial number, even if RLC ACK has been received in rlc layer, PDCP layers should not also abandon them.It can only that is, having been based on PDCP PDU that RLC ACK identifies that it is delivered successfully It is abandoned according to the sequence of its PDCP serial number.For example, even if identify PDCP serial number 1,2,3,4,5,9 and 10 successfully from The RLC ACK of rlc layer is transmitted, can only also be abandoned from the 5th buffer PDCP serial number 1,2,3,4 and 5 and with corresponding PDCP The relevant information of PDU and map information.

As second situation, terminal can use network configuration to execute PDCP layer operation, wherein in the network configuration In, PDCP layers selectively should retransmit the PDCP PDU being up to the present not yet delivered successfully to the target BS of switching.In In this case, if receiving the information about the PDCP PDU for being cascaded to the RLC PDU that RLC ACK has been received, PDCP layers can abandon information corresponding with PDCP PDU and map information from the 5th buffer, and can individually store About the information for the PDCP serial number for receiving ACK in order, to use the information during switching.

With reference to Figure 17 B, terminal rlc layer operates at operation 1735.It is lost if received at operation 1740 from PDCP layers Indicator is abandoned, then at operation 1745, when PDCP PDU corresponding with indicator is abandoned becomes RLC in rlc layer not yet A part of PDU or when being mapped to thereon not yet, at operation 1755, terminal rlc layer can abandon corresponding informance. That is terminal rlc layer abandon to be transmitted to and be stored in the PDCP PDU in rlc layer (RLC SDU) relevant information and Map information.If the PDCP PDU indicated by discarding indicator has become a part of RLC PDU at operation 1745, Then in operation 1750, terminal rlc layer does not abandon information relevant to PDCP PDU.

If receiving RLC state report from the rlc layer of receiving end at operation 1740, rlc layer can identify each The ACK/NACK result of RLC serial number.In addition, in the case where operating the RLC PDU of the confirmation at 1760, at operation 1765, Rlc layer abandons and the relevant mapping of RLC PDU that confirms from pre-processing and store the hex buffer of RLC PDU/PDCP PDU Information, MAC sub-header and MAC SDU.On the contrary, being directed to the RLC PDU of negative confirmation, rlc layer prepares to retransmit at operation 1775.

If the uplink grant during the execution of re-transmission for re-transmission is enough, rlc layer be can be used by the 6th The MAC sub-header and MAC SDU of map information of the buffer based on RLC PDU and data prediction are come quick execution re-transmission.Phase Instead, if uplink grant is insufficient, rlc layer can be segmented again for the last one MAC sub-header and MAC SDU execution, To update RLC header and MAC sub-header, and re-transmission can be executed.Rlc layer can identify RLC sequence by RLC state report Number ACK/NACK's as a result, identify map information at operation 1770, and determine the ACK/ of corresponding PDCP serial number NACK result.If identifying the ACK information of PDCP serial number, the ACK information of PDCP serial number can be transmitted to PDCP by rlc layer Layer.PDCP layers can identify ACK information, and ACK information can be used and abandon corresponding PDCP PDU from the 5th buffer.

Therefore, it is being applicable according to the disclosure when the terminal of next generation mobile communication system operates under RLC AM mode Efficient buffer management method and retransmit accelerated method fourth embodiment in, rlc layer can be abandoned from the 5th buffer Information and map information/data prediction MAC sub-header and MAC about the RLC PDU that RLC ACK has been received SDU and PDCP layers of the corresponding PDCP PDU of RLC PDU has been notified with rlc layer, and discharge and abandon corresponding informance And timer.Therefore, it even if using small size quickly to empty the 5th buffer and hex buffer, can also efficiently manage Buffer is managed, therefore with maximum efficiency and can accelerate to retransmit.

Figure 18 A and Figure 18 B are to show wherein next generation mobile communication system terminal according to an embodiment of the present disclosure to exist The diagram of buffer, terminal operation is managed under RLC UM mode.

With reference to Figure 18 A, if receiving IP grouping from upper layer, PDCP layers of terminal can operate at operation 1801, eventually End PDCP layer can operation 1805 at receive IP grouping, and can operate 1810 at by by allocations of storage addresses to IP Each IP grouping is stored in the 5th buffer by grouping.In addition, PDCP layers of terminal can drive and manage at operation 1815 The PDCP for managing each IP grouping abandons timer.If timer expiration, at operation 1820, terminal is lost from the 4th buffer Abandon PDCP PDU or PDCP SDU corresponding with timer.If at operation 1825, PDCP corresponding with timer PDU is sent to rlc layer, then at operation 1830, PDCP layers can be sent discarding indicator corresponding with PDCP PDU To rlc layer.The PDCP PDU serial number for being sent to rlc layer or the map information about PDCP PDU can be indicated by abandoning indicator. In addition, if receiving the ACK/NACK information about PDCP PDU from the PDCP layer of receiving end by PDCP state report, then PDCP layers can abandon the PDCP PDU confirmed from the 5th buffer, and if there is corresponding with the PDCP PDU of discarding Not expired timer, then at operation 1820, PDCP layers can stop and abandon timer.In addition, if being sent from rlc layer RLC PDU, and the information about the PDCP PDU for being cascaded to transmitted RLC PDU is transmitted to PDCP layers by rlc layer, PDCP Layer can abandon the information about transmitted PDCP PDU from the 5th buffer, and if corresponding timer does not expire, Then it can discharge and abandon timer for PDCP layers.

With reference to Figure 18 B, terminating layer operates at operation 1835.If receiving discarding instruction from PDCP layers in operation 1840 Symbol becomes the RLC PDU's in rlc layer in PDCP PDU corresponding with indicator is abandoned then at operation 1845 not yet A part or in the case where being mapped to thereon not yet, terminal rlc layer can abandon corresponding informance.That is, grasping Make at 1855, terminal rlc layer abandon to be transmitted to and be stored in the PDCP PDU in rlc layer (RLC SDU) relevant information with And map information.If the PDCP PDU indicated by discarding indicator has become one of RLC PDU at operation 1845 Point, then at operation 1850, terminal rlc layer does not abandon information relevant to PDCP PDU.

Rlc layer can configure RLC PDU by the data prediction of PDCP PDU before receiving uplink grant, And RLC PDU can be completed and pass it to MAC layer, MAC sub-header and MAC SDU are stored in hex buffer In.In addition, if by receive uplink grant complete RLC PDU transmission, then operation 1860 at, rlc layer abandon with The relevant information of RLC PDU, map information, MAC sub-header and MAC SDU (being abandoned from hex buffer).In other words, In Under RLC UM mode, rlc layer sends RLC PDU, then abandons relevant information (if any), without storing RLC PDU.This It is because not supporting ARQ function under RLC UM mode, It is not necessary to information of the record for re-transmission.In addition, operating At 1865, rlc layer can determine the information about PDCP PDU corresponding with transmitted RLC PDU and pass it to PDCP layers, and the information can be used to manage the 5th buffer.

Therefore, in the efficient buffer tubes when the terminal of next generation mobile communication system operates under RLC UM mode In the fourth embodiment of reason method, rlc layer sends RLC PDU, then can abandon relevant information in hex buffer and right The MAC sub-header and MAC SDU (if any) for the data prediction answered, without storing corresponding RLC PDU.In addition, In In fourth embodiment, rlc layer can send PDCP for the information about PDCP PDU corresponding with transmitted RLC PDU Layer, and even if PDCP timer not yet expires, the PDCP layers of letter that can be also abandoned immediately from the 5th buffer about PDCP PDU Breath.

First embodiment of the present disclosure to fourth embodiment proposes the buffer structure and again when terminal sends data Pass accelerated method.In the disclosure, when terminal receives data, rlc layer can have independent buffer RLC for storage PDU.RLC PDU can only indicate segmentation PDU sections of RLC, and cannot indicate complete RLC PDU (the RLC PDU of non-segmentation or It is not the RLC PDU of segmentation).That is, if rlc layer receives complete RLC PDU when terminal receives data, it Upper layer can directly be passed them to without storing them, and if receiving RLC PDU segmentation, rlc layer deposits them Storage is used to recombinate in independent buffer, and if meeting specified conditions, and RLC PDU piecewise combination is one complete by it RLC PDU, complete RLC PDU is transmitted to upper layer.There are no the RLC for being combined into a complete RLC PDU PDU segmentation can be all dropped.Specified conditions can be the situation expired for the timer of recombination, or be based on The case where window movement of rlc layer serial number is to trigger recombination.

Figure 19 is the block diagram of terminal according to an embodiment of the present disclosure.

With reference to Figure 19, terminal includes radio frequency (Radio Frequency, RF) processor 1910, baseband processor 1920, deposits Reservoir 1930 and controller 1940.

RF processor 1910 executes the function for sending and receiving signal over a radio channel, and such as signal band turns It changes and amplifies.That is, RF processor 1910 is executed from the baseband signal that baseband processor 1920 provides to RF band signal Upper conversion, send antenna for the signal of conversion, and execute through the received RF band signal of antenna to baseband signal Lower conversion.For example, RF processor 1910 may include transmitting filter, receiving filter, amplifier, frequency mixer, oscillator, Digital analog converter (Digital-to-Analog Converter, DAC digital analog converter) and analog-digital converter (Analog-to- Digital Converter, ADC).Although illustrating only an antenna in the accompanying drawings, terminal can be provided with multiple Antenna.In addition, RF processor 1910 may include multiple RF chains.In addition, RF processor 1910 can execute beam forming.For Beam forming, the phase of the adjustable signal sent or received by mutiple antennas or antenna element of RF processor 1910 and Size.In addition, RF processor can execute MIMO, and several layers can be received during the execution of MIMO operation.RF processing Device 1910 can receive beam scanning by the appropriately configured execution of mutiple antennas or antenna element under the control of the controller, or Person can control the direction for receiving wave beam and beam angle, so that receiving wave beam and sending beam Synchronization.

Baseband processor 1920 executes the conversion between baseband signal and Bit String according to the physical layer standard of system.Example Such as, between data transfer period, baseband processor 1920 generates complex symbol by encoding and modulating transmitted Bit String.This Outside, during data receiver, baseband processor 1920 by demodulate and decode the baseband signal that is provided from RF processor 1910 come Restore the received Bit String of institute.For example, in the case where following OFDM method, between data transfer period, baseband processor 1920 Complex symbol is generated by encoding and modulating transmitted Bit String, is executed complex symbol mapping on sub-carriers, then Pass through inverse Fast Fourier Transform (Inverse Fast Fourier Transform, IFFT) operation and cyclic prefix (Cyclic Prefix, CP) interpolation configures OFDM symbol.In addition, baseband processor 1920 is during data receiver with OFDM Symbol is that unit divides the baseband signal provided from RF processor 1910, is operated by Fast Fourier Transform (FFT) to restore The signal of mapping on sub-carriers, then restores received Bit String by demodulation and decoding.

Baseband processor 1920 and RF processor 1910 send and receive signal as described above.Therefore, baseband processor 1920 and RF processor 1910 can be referred to as transmitter, receiver, transceiver or transceiver.In addition, different in order to support Radio connection technology, at least one of baseband processor 1920 and RF processor 1910 may include multiple communication modules. In addition, in order to handle the signal of different frequency frequency band, at least one of baseband processor 1920 and RF processor 1910 can be with Including different communication modules.For example, different radio connection technologies may include LTE network and NR network.In addition, different Frequency band may include hyperfrequency (Super High Frequency, SHF) (for example, 2.5GHz or 5GHz) frequency band and milli Metric wave (mmWave) (for example, 60GHz) frequency band.

Memory 1930 is in wherein number of the storage for the basic program of the operation of terminal, application program and configuration information According to.Memory 1930 provides stored data according to the request from controller 1940.

The whole operation of 1940 controlling terminal of controller.For example, controller 1940 passes through at baseband processor 1920 and RF Reason device 1910 sends and receives signal.In addition, controller 1940 records data in memory 1930 or from memory 1930 read data.For this purpose, controller 1940 may include execute instruction with implement multi-connection processor 19 at least one at Device is managed, wherein multi-connection processor 19 is executed instruction to implement multi-connection processor 204242.For example, controller 1940 can wrap Include the application for executing the communication processor (Communication Processor, CP) for the control of communication and controlling upper layer Processor (Application Processor, AP), such as application program.

Figure 20 is the block configuration according to an embodiment of the present disclosure for sending and receiving point (TRP).

With reference to Figure 20, base station includes RF processor 2010, baseband processor 2020, transceiver 2030,2040 and of memory Controller 2050.

RF processor 2010 executes the function for sending and receiving signal over a radio channel, and such as signal band turns It changes and amplifies.That is, RF processor 2010 is executed from the baseband signal that baseband processor 2020 provides to RF band signal Upper conversion, send antenna for the signal of conversion, and execute through the received RF band signal of antenna to baseband signal Lower conversion.For example, RF processor 2010 may include transmitting filter, receiving filter, amplifier, frequency mixer, oscillator, DAC and ADC.Although illustrating only an antenna in the accompanying drawings, the first connecting node can be provided with mutiple antennas.This Outside, RF processor 2010 may include multiple RF chains.In addition, RF processor 2010 can execute beam forming.For wave beam at Shape, the phase and size of the adjustable signal sent or received by mutiple antennas or antenna element of RF processor 2010. In addition, RF processor can execute lower MIMO operation by the transmission of one or more layers.

Baseband processor 2020 executes baseband signal and Bit String according to the physical layer standard of the first radio connection technology Between conversion.For example, between data transfer period, the Bit String next life transmitted by coding and modulation of baseband processor 2020 At complex symbol.In addition, baseband processor 2020 is provided by demodulation and decoding from RF processor 2010 during data receiver Baseband signal to restore received Bit String.For example, in the case where following OFDM method, between data transfer period, base Provided with processor 2020 generates complex symbol by encoding and modulating transmitted Bit String, executes complex symbol being mapped in son On carrier wave, OFDM symbol is then configured by FFT operation and CP interpolation.In addition, during data receiver, baseband processor 2020 divide the baseband signal provided from RF processor 2010 as unit of OFDM symbol, restore to be mapped in by FFT operation Then signal on subcarrier restores received Bit String by demodulation and decoding.Baseband processor 2020 and RF processor 2010 send and receive signal as described above.Therefore, baseband processor 2020 and RF processor 2010 can be referred to as transmitter, Receiver, transceiver, transceiver or wireless transceiver.

Transceiver 2030 is provided for executing the interface with the communication of other nodes in network.

Memory 2040 is in wherein storage for the basic program of the operation of master base station, application program and configuration information Data.Specifically, memory 2040 can store about distribute to connection terminal carrying information and from connection terminal report Measurement result.In addition, memory 2040, which can store, becomes the basis for determining the multi-connection for being to provide still pause to terminal Information.In addition, memory 2040 provides stored data according to the request from controller 2050.

The whole operation of the control master base station of controller 2050.For example, controller 2050 passes through baseband processor 2020 and RF Processor 2010 is sent and received signal by transceiver 2030.In addition, controller 2050 records data in storage Data are read in device 2040 or from memory 2040.For this purpose, controller 2050 may include executing instruction to implement connect more Connect at least one processor of processor 2052.

In explaining the attached drawing according to disclosed method, the sequence of explanation not necessarily corresponds to the sequence executed, and Process can be according to backward or parallel execution.

It, can be in the case where not departing from the theme of the disclosure in addition, in explaining attached drawing according to disclosed method Only include the part of constituent element, and omits the other parts of constituent element.

Although describing preferred embodiment of the present disclosure in the specification and illustrated in the drawings, and it is used for specific Wording, but these are only used as general sense to help those of ordinary skill in the art to obtain comprehensive reason to the disclosure Solution, and do not limit the scope of the present disclosure.For disclosure those of ordinary skill in the art it is readily apparent that in addition to this Except literary disclosed embodiment, the technological concept based on the disclosure, various modifications are possible.

Although the disclosure has shown and described in the various embodiments by reference to the disclosure, those skilled in the art will Understand, in the case where not departing from the spirit and scope of the present disclosure being defined by the appended claims and the equivalents thereof, Ke Yi Various changes are carried out in form and details.

Claims (15)

1. a kind of in a wireless communication system by the method for device control buffer, which comprises

Information relevant to grouping is stored at least one of the first buffer or the second buffer；

Send the data generated based on the grouping；And

When for the data receiver to confirmation signal, the information is abandoned.

2. according to the method described in claim 1, wherein, abandoning the information includes abandoning from first buffer by described The timer information of packet configuration.

3. according to the method described in claim 1, wherein, storing the information further comprises:

Packet Data Convergence Protocol (PDCP) protocol Data Unit (PDU) corresponding with the grouping is stored in described first In buffer；And

Radio link control (RLC) PDU corresponding with PDCP PDU is stored in second buffer.

4. according to the method described in claim 1, further comprise store first buffer and second buffer it Between map information,

Wherein, abandoning the information includes abandoning the information based on the map information.

5. according to the method described in claim 1, wherein, abandon the information include: when the information be only stored in it is described When in the first buffer, the information and the timer information for the packet configuration in first buffer are abandoned.

6. a kind of in a wireless communication system by the method for device control buffer, which comprises

The first information relevant to the first grouping is stored in third buffer；

The second information relevant to second packet is stored in the 4th buffer, wherein second information is by obtaining use First grouping is pre-processed before the resource information for sending first grouping and is generated；

Identify the map information between the location information of the third buffer and the location information of the 4th buffer；And

When receiving the resource information, data corresponding with the second packet are sent based on the resource information.

7. according to the method described in claim 6, further comprise, when for the data receiver to confirmation signal, it is based on The map information and abandon the first information and second information.

8. according to the method described in claim 7, wherein, abandoning the first information includes being discarded as first packet configuration Timer information.

9. the device in a kind of wireless communication system, described device include:

Transceiver；And

At least one processor, is configured as:

Information relevant to grouping is stored at least one of the first buffer or the second buffer,

The data generated based on the grouping are sent, and

When for the data receiver to confirmation signal, the information is abandoned.

10. device according to claim 9, wherein at least one described processor is further configured to from described One buffer abandons the timer information by the packet configuration.

11. device according to claim 9, wherein at least one described processor is further configured to:

Packet Data Convergence Protocol (PDCP) protocol Data Unit (PDU) corresponding with the grouping is stored in described first In buffer, and

Radio link control (RLC) PDU corresponding with PDCP PDU is stored in second buffer.

12. device according to claim 9, wherein at least one described processor is further configured to:

The map information between first buffer and second buffer is stored, and

The information is abandoned based on the map information.

13. device according to claim 9, wherein at least one described processor is further configured to: if about The information of the grouping is only stored in first buffer, then abandon about it is corresponding with transmitted data, deposit Store up the information in the grouping in first buffer and the timer information for the grouping being allocated in first buffer.

14. the device in a kind of wireless communication system, described device include:

Transceiver；And

At least one processor, is configured as:

The first information relevant to the first grouping is stored in third buffer,

Second information is stored in the 4th buffer, second information with by obtain for send it is described first grouping Resource information before pre-process first grouping and the second packet that generates is related,

Identify the map information between the location information of the third buffer and the location information of the 4th buffer, and

When receiving the resource information, data corresponding with the second packet are sent based on the resource information.

15. device according to claim 14, wherein at least one described processor is further configured to, when being directed to When the data receiver is to confirmation signal, the first information and second information are abandoned based on the map information, and And

Wherein, at least one described processor is further configured to be discarded as first grouping from the third buffer and matches The timer information set.