CN101479965B

CN101479965B - Re-establishment method and device for confirming mode wireless link control entity

Info

Publication number: CN101479965B
Application number: CN2006800552354A
Authority: CN
Inventors: 千成德; 李英大; 郑明哲; 朴成埈
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2006-07-05
Filing date: 2006-10-25
Publication date: 2013-07-10
Anticipated expiration: 2026-10-25
Also published as: CN101479965A; WO2008004724A1

Abstract

A re-establishment method for an Acknowledged Mode Radio Link Control entity, the method comprising: receiving, from an upper entity, a command to perform Acknowledged Mode Radio Link Control re-establishment; and managing control protocol data units by considering the direction of the Acknowledged Mode Radio Link Control re-establishment, wherein control protocol data units related to the direction are deleted and control protocol data units not related to the direction are not deleted.

Description

A kind of method for reconstructing and equipment for the affirmation mode radio link control entity

Technical field

The present invention relates to a kind of in the UMTS(universal mobile telecommunications system) in the method for operation of AM RLC, this system is European plan IMT-2000 system.Especially, the present invention relates to a kind of improved AM RLC method for reconstructing, when rebuilding the RLC entity, AM RLC reduces data or the control message (quantity) that will delete thus, sends out defeated and receiving velocity therefore intermittently communicating minimized and can increase data.

Background technology

Fig. 1 shows the universal mobile telecommunications system for UMTS() example network architecture.Described UMTS system is made up of portable terminal (subscriber equipment: UE), UTRAN(UMTS terrestrial access network) and core network (CN) usually.Described UTRAN has one or more RNSs (RNS), and each RNS has radio network controller (RNC) and one or more base station (Node B).For each Node B, there are one or more residential quarters.

Fig. 2 shows the example wireless protocol architecture that uses in UMTS.These radio protocol layers are present among UE and the UTRAN in couples, and by the transmission of wave point deal with data.About each radio protocol layer, PHY layer (layer 1) is used for by using various Radio Transmission Technologys by wave point transmission data.Described PHY layer links to each other with the MAC layer via transmission channel, in order to support reliable transfer of data, and described transmission channel can be according to whether shared channel is divided into dedicated transmission channel and Common transport channel.

In layer 2, there are MAC, RLC, PDCP and BMC layer.Described MAC layer is carried out various logical channels to the mapping of various transmission channels, and carries out for the logic channel that a plurality of logic channels is mapped to single transmission channel multiplexing.Described MAC layer links to each other with rlc layer (more higher-level layer) via logic channel, and described logic channel is divided into for the control channel of transmission control plane information according to the type of the data transmitted and is used for the Traffic Channel of transmission user plane information.Described MAC layer can also be divided into MAC-b sublayer, MAC-d sublayer, MACc/sh sublayer, MAC-hs sublayer and MAC-e sublayer according to the transmission channel of being managed.Described MAC-b sub-layer processes BCH(broadcast channel) management, described BCH is the transmission channel for the treatment of the broadcasting of system information.The Common transport channel that described MAC-c/sh sublayer management is shared by various portable terminals is such as the FACH(forward access channel), the DSCH(downlink sharied signal channel) and the like.Described MAC-d sub-layer processes DCH(dedicated channel) management, described DCH is the dedicated transmission channel for specific portable terminal.Described MAC-hs sublayer management HS-DSCH(high-speed downlink shared channel), described HS-DSCH is the transmission channel for the high rate downlink data transmission.Described MAC-e sublayer management E-DCH(strengthens dedicated channel), described E-DCH is the transmission channel for downlink data transmission of high speed.

Rlc layer guarantees the service quality (QoS) of each radio bearer (RB) and handles the transmission of its data.In order to guarantee the exclusive QoS by RB, rlc layer has one or two the RLC entity independently for each RB, and three class RLC pattern, i.e. TM(transparent modes are provided), the UM(Unacknowledged Mode) and the AM(affirmation mode), in order to support various QoS.And the adjusted size that rlc layer is carried out data is to be suitable for the even lower level layer with the function by wave point transmission data.For this reason, carry out the function with cascade cut apart of the data that receive from higher-level layer more.

The PDCP layer is positioned at than rlc layer high-level more, and adopts the IP(Internet protocol) packet format (such as IPv4 or IPv6) to be to allow carrying out the efficient data transmission by the wave point with less relatively bandwidth.For this reason, the PDCP layer is carried out the function of header-compressed, and this allows only to transmit the necessary information in the header portion of data, to improve the efficiency of transmission of wave point thus.Because header-compressed is basic function, so the PDCP layer exists only in the PS territory, and in order to provide effective header-compressed at each PS service, there is a PDCP entity for each RB.

In addition, in layer 2, BMC(broadcast/multi broadcast control) layer is present in than rlc layer high-level more, and carries out the scheduling of cell broadcast messages and carry out to the function of the portable terminal broadcasting that is arranged in specific cell.Being arranged in the RRC(Radio Resource control of layer 3 lowermost portion) layer only is limited at control plane, control and the foundation of RB, the parameter that reconfigures and discharge relevant layer 1 and layer 2, and the control of processing logic channel, transmission channel and physical channel.Here, described RB refers to by the layer 1 of wireless protocols and layer 2 logical path that provides, and is used for the transfer of data between portable terminal and UTRAN.Usually, the foundation of RB refers to the processing that regulation provides the feature of the required protocol layer of concrete service and channel and each detail parameters and method of operation are set.

Rlc layer involved in the present invention will be considered in more detail.

The basic function of rlc layer is to guarantee the QoS of each RB and transmit its data.Offer the more service of high-level because the RB service is the layer 2 of wireless protocols, so whole layer 2 is finished described QoS, and especially, the effect of rlc layer is significant.In order to guarantee the exclusive QoS by RB, for each BR, rlc layer has independently RLC entity, and the three class RLC patterns (TM, UM and AM) that are used for supporting various QoS are provided.Three kinds of patterns of this of rlc layer there are differences in its method of operation, because the QoS that they are supported respectively is different, and their detailed functions also there are differences.Similarly, should consider rlc layer in more detail at the operator scheme of rlc layer.

TM RLC is the pattern that the RLC SDU that wherein receives from high-level more when forming (formation) RLC PDU does not add any expense.Be that title TM RLC refers to RLC with the fact of transparent way transmission SDU, and in user plane and control plane, carry out following function.In user plane, because data processing time is short, so the transmission of the real-time current data of the voice in processing such as circuit service (CS) territory or stream.In control plane, owing to do not have expense in the RLC, thus under the situation of up link, handle the transmission from the RRC message of not specifying portable terminal, and for down link, handle the transmission of the RRC message that is broadcast to all portable terminals in the residential quarter.

(TM) is different with transparent mode, and wherein the pattern by RLC interpolation expense is called non-transparent mode, and it comprises two kinds of patterns: the affirmation pattern (AM) of confirming to receive the Unacknowledged Mode (UM) of the response of transmitting data (UM) and response being provided or not.UM RLC has been in case added the PDU header that comprises sequence number (SN) to each PDU and just transmitted each PDU, therefore to allow the recipient to know during the transmission to have lost (or losing) which PDU.Because this type of function, UM RLC handles the transmission of the broadcast/multi broadcast data in user plane or such as the transmission of the real time packet data of the voice (for example VoIP) in packet service (PS) territory or stream and the transmission of the RRC message in control plane, described transmission need be in the confirmation of receipt response that is transferred between the RRC message of particular terminal or specific group of terminals.

As the non-transparent mode type, AM RLC comprises that by interpolation the PDU header of SN forms PDU(as doing in UM RLC), but different with UM RLC, and its significant difference is that the recipient provides the affirmation to the PDU that transmits from the side of emission.In AM RLC, it is that those PDU that can not be received are transmitted again in request emission side that the recipient provides the reason of affirmation.This type of again transfer function be one of notable feature of AM RLC.As a result, the purpose of AM RLC be by this again transfer function guarantee errorless data transmission.Because this purpose, AMPLC handles non real-time packet data transmission (such as the TCP/IP in PS territory) usually in user plane, and in control plane, handle the transmission of RRC message, the transmission of described RRC message requires the confirmation of receipt response between the RRC message of the particular terminal in being transferred to the residential quarter all the time.

About direction, TM RLC and UM RLC are used for one-way communication, and AM RLC is used for two-way communication, because there is the feedback from the recipient.Because two-way communication is normally used for point to point link, so AM RLC only uses dedicated logical channel.Also have structural difference, thus, for TM RLC and UM RLC, single RLC entity has a kind of structure for transmitter or receiver, but for AM RLC, single RLC entity has transmitter and receiver simultaneously.

AM RLC is because its transfer function but complicated again.In order to manage transfer function again, AM RLC also has transmission buffer again except having the transmission buffer, adopt the transmission window that is used for current control, carry out thus transmitter requests from the poll of the state information of the reciprocity RLC of receiver, employing is reported its buffer state by the status report that receiver sends with the reciprocity RLC to transmitter, adopt status PDU with carrier state information, execution is inserted status PDU incidentally (piggyback) function of data PDU with the raising data transmission efficiency, and carries out many other functions.In addition, if AM RLC entity is found appreciable error during its operating process, then adopt reset PDU asking reciprocity AM RLC entity resets all operations and parameter, and the Ack PDU that resets is used to respond this type of reset PDU.And in order to support this type of function, AM RLC needs variety of protocol parameter, state variable, timer and the like.Such as status report or status PDU, reset PDU etc. be used for be known as control PDU at the PDU of the Data Transmission Controlling of AM RLC, and the PDU that is used for transmitting user data is known as data PDU.

Generally speaking, the PDU that uses in AM RLC is divided into two classes: data PDU and control PDU.There is four classes control PDU, that is, and status PDU, incidentally status PDU, reset PDU and the Ack PDU that resets.

Reset routine is a kind of situation that adopts control PDU.Described reset routine is used for dealing with problems when there is error situation in the operation at AM RLC, such as when the sequence number of using respectively not simultaneously, during when the bust this of the PDU of generation some or SDU and the like.In case use reset routine, the AM RLC of Receiver And Transmitter are with the state variable initialization, in order to realize the state of executive communication again.Described reset routine is as follows.At first, determine a side of beginning reset routine, namely the AM RLC of transmitter comprises the transmit direction HFN(Hyper Frame Number in the reset PDU of its current use) and it is transferred to receiver.Then, in case receive this type of reset PDU, the AM RLC of receiver resets its receive direction HFN value and with sequence number and other various state variable initialization.And receiver AM RLC will comprise that the Ack PDU that resets of its transmit direction HFN value is transferred to transmitter AM RLC, and in case receive this when resetting Ack PDU, transmitter AM RLC is just in its receive direction HFN value various state variables of initialization afterwards that reset.

Fig. 3 shows the example arrangement of the RLC PDU that uses in AM RLC entity.Here, the structure of AMD PDU is the data PDU of using when the transmission data.

When AM RLC entity with transmitting user data or when transmitting incidentally state information and poll bit, use AMD PDU.Described user data partly comprises 8 integer multiples, and the AMDPDU header comprises that having is the sequence number of 2 eight bit byte sizes.And the header portion of AMD PDU comprises length indicator.

Fig. 4 shows the example arrangement of status PDU.Described status PDU is made up of dissimilar superwood sections (SUFI).Status PDU can have variable-sized, but is subject to the size of the maximum RLC PDU of the logic channel of transmission status PDU on it.Here, SUFI is used for providing some information, and which AMD PDU arrives receiver or which AMDPDU no show still such as expression.Described SUFI can be made up of three parts: type, length and value.

Fig. 5 shows the incidentally example arrangement of status PDU.The structure of described incidentally status PDU is similar to the structure of AMD PDU, but the D/C field of AMD PDU replaces with reservation position (R2).If enough spaces are still arranged among the AMD PDU, then insert incidentally status PDU.Described PDU types value is fixed as 000 all the time.At last, control PDU comprises status PDU and status PDU incidentally simultaneously.

Fig. 6 shows the example arrangement of the Ack PDU that resets/reset.Described reset PDU comprises 1 sequence number that is called RSN.In response to received reset PDU, transmit the described Ack PDU that resets, and when transmission, comprise the RNS of received reset PDU.

Following parameter is used with the Ack PDU form that resets/reset.

(1) D/C field: expression PDU is control PDU or data PDU.

(2) PDU type: the type of expression control PDU, that is, PDU is reset PDU or status PDU etc.

(3) sequence number: the serial number information that refers to AMD PDU.

(4) poll bit: when reporting from the receiver solicited status, arrange.

(5) extension bits (E): represent whether next eight bit byte is length indicator.

(6) keep position (Rl): if be used for reset PDU or the Ack PDU that resets, then be encoded to 000.

(7) header extension (HE): represent that next eight bit byte is length indicator or data.

(8) length indicator: the position on expression border, if this type of border is present between each interior different SDU of the data division of PDU.

(9) PAD: expression fill area (padding region), but be not used in AMD PDU.

To explain the reset routine of AM RLC entity below.

At first, when taking place to need to carry out the situation of reset routine, receiver must transmit reset PDU to transmitter.If transmit certain number of times of having failed if receive the status PDU or the specific PDU that comprise the mistake sequence number, then carry out reset routine.When the transmission reset PDU, transmitter is carried out following operation.

1. stop the transmission of AMD PDU and status PDU.

2. ignore received AMD RLC PDU, status PDU and status PDU incidentally.

3.VR(RST) increase by 1.

4. if VR(RST) greater than MaxRST, then it is notified to RRC, if VR(RST) less than MaxRST, then reset PDU is transferred to receiver.

Here, when carrying out reset routine, all by using the inner parameter initialization VR(RST of receiver) at every turn.For each reset routine, this value is the maximum of transmission reset PDU.That is, if reset PDU transmission surpasses the MaxRST value, then stop reset routine immediately and notify high-level more that the mistake that can not solve has taken place.

When transmitter transmission reset PDU, HFNI value and RSN value are included in this transmission.Here, transmitter HFNI is set to the maximum HFN value of its use.Described HFN be for the coding (encryption) value and transmitter use the AMD PDU part of this HFN value to encode except its SN value.Receiver uses the identical received AMDPDU of HFN value decoding.If Receiver And Transmitter does not have identical HFN value, then can not keep the communication between them.Therefore, in reset routine, their HFN value of transmitter and receiver exchange is so that transmitter and receiver all is set to have identical HFN value.Therefore, transmitter and receiver when when transmission its HFN value is included in reset PDU or the Ack PDU that resets in.

The RNS value is used to mate each reset PDU and the Ack PDU that resets.That is, have the reset PDU that is set to 1 RSN value if transmitter sends, then receiver only will have the Ack PDU that resets that the Ack PDU that resets that is set to 1 RSN is identified as its expectation.If receive the Ack PDU that resets with the RSN value that is set to not to be 1 value, then this type of Ack PDU that resets is regarded as wrong and therefore is dropped.And for each reset routine of beginning, the RNS value increases by 1.

When transmitting in response to reset PDU when resetting Ack PDU, receiver is filled into by the maximum HFN that will use on its transmit direction and sends this maximum HFN among the HFNI, and the RNS value identical with RNS value in being included in corresponding reset PDU is included among the Ack PDU that resets and is transmitted.

In case receive reset PDU, receiver is just carried out following operation.

1. whether the RSN value of using in the reset routine that transmitter is carried out more at last is identical with RSN value in being included in the current reset PDU that receives.Then, execution in step 2.

2. if in step 1, described RSN value is identical, then receiver uses the value identical with the value of before transmitting the Ack PDU that resets to transmit the Ack PDU that resets again.Then, execution in step 3.

3. if the current reset PDU that receives is to set up or rebuilding first reset PDU that receives after the RLC entity, if perhaps the RSN value is different from the RNS value of the up-to-date reset PDU that receives, then carry out following steps in turn; Otherwise this process stops.

4. form again and transmit the Ack PDU that resets.

5. init state variable and stop the timer of current operation.

6. abandon received RLC PDU.

7. abandon the transmitting RLC PDU before that resets.

8. the HFN of receiver direction is set according to the HFN in the reset PDU that receives.

9. transmitter-side increases by 1 to the HFN with the receiver direction.

After transmitter transmission reset PDU, wait for receiving the Ack PDU that resets, and when receiving when resetting Ack PDU, carry out following the operation by transmitter.

If 1. be included among the Ack PDU that resets the RSN value be included in the RNS value in the reset PDU of its transmission identical, then carry out following steps; Otherwise, abandon the Ack PDU that resets.

2. be included in the reset HFN of receiver direction of HFNI value among the received Ack PDU that resets by use.

3. init state variable and stop the timer of current operation.

4. abandon received RLC PDU.

5. abandon the transmitting RLC PDU before that resets.

6. transmitter-side increases by 1 to the HFN with the receiver direction.

Carry out after this type of reset routine, transmitter and receiver all has identical HFN, and carries out the Code And Decode program with this HFN.

Reconstruction algorithm in the AM RLC entity involved in the present invention hereinafter will be described.

In case receive the instruction from the RRC entity, just carry out the RLC reconstruction algorithm.For the AMRLC entity, can to both direction (that is, transmitter-side to receiver direction) or only to transmitter-side to or the receiver direction among a direction carry out and rebuild.Operate below the command execution according to RRC.

1. the init state variable arranges the value that can arrange then.

2. the HFN value of receiver direction is set according to the value from more high-level indication.

3. the control PDU of deletion transmitter and receiver, and the AMDPDU of delete receiver.

Carry out the reconstruction that the transmitter-side at the RLC entity makes progress in the following manner.

1. the init state variable arranges the value that can arrange then.

3. for the reconstruction that only makes progress in transmitter-side, from step 4 executive program.For the reconstruction of while at transmitter and receiver, from step 6 executive program.

4. the control PDU of transmitter and receiver is all deleted, and among the SDU of transmitter, deletion is those SDU of transmission fully.

5. be segmented in not deleted SDU in the step 4 again again according to set RLC size.Then, execution in step 7.

6. the control PDU of Receiver And Transmitter is all deleted, and the AMD PDU in the deletion transmitter.

7. stop the timer except Timer_poll_periodic and Timer_status_periodic.

In correlation technique, when carrying out the RLC reconstruction algorithm, be for unidirectional (being transmit direction or receive direction) even rebuild, also PDU is all controlled in deletion.Yet, may not wish in some cases so.

Summary of the invention

Technical problem

Technical solution

Developed the present invention, in order to solve the correlation technique of PDU of the problems referred to above all control to(for) the both direction deletion of rebuilding at least.Therefore, the invention provides a kind of re-establishment mechanism of AMRLC efficiently (scheme), it only deletes those control PDU relevant with the specific reconstruction direction.

Description of drawings

Fig. 1 shows and can be applicable to correlation technique and exemplary UMTS network architecture of the present invention.

Fig. 2 shows the example wireless protocol architecture that uses in UMTS.

Fig. 3 shows the example arrangement as the AM RLC PDU of the data PDU of using when transmitting data.

Fig. 4 shows the example arrangement of status PDU.

Fig. 5 shows the incidentally example arrangement of status PDU.

Fig. 6 shows the example arrangement of the Ack PDU that resets/reset.

Fig. 7 shows folk prescription (direction) reconstruction algorithm of the poor efficiency that takes place during the RLC reseting procedure.

Fig. 8 shows the exemplary process diagram according to the RLC method for reconstructing in the wireless communication system of the present invention.

Embodiment

An aspect of of the present present invention be the inventor approve about on address hereinafter problem and the shortcoming of the correlation technique of explaining in more detail.Based on this type of approval, developed feature of the present invention.

Usually can following description concept of the present invention and feature:

At first, should be noted that the reason that must carry out the RLC reconstruction may be a lot.Example can be when portable terminal (UE) be to be subjected to the control of first wireless network control (RNC) but when being subjected to the control of the 2nd RNC afterwards at first.Because different manufacturers produces themselves radio network controller (RNC), so each RNC will use the parameter of its own type, thereby causes compatibility issue.

Another example that needs RLC to rebuild (for the RLC of the RLC of UE, network or both) is when residential quarter (or area of coverage) comprises the zones of different that can support different access technologies.For example, about single subdistrict, in the position near center of housing estate, UE can carry out with network and insert (such as HSDPA and/or HSUPA) at a high speed, but in the position near cell boarder (or edge), this type of inserts at a high speed may be unavailable.Because UE is mobile in single subdistrict, in two or more moving between cells, mobile etc. between networks of different type, rebuild in order to support seamless communication so should carry out RLC.

In correlation technique, when carry out rebuilding (AM RLC reconstructions), all relevant control informations of deletion and emission side and recipient.That is, as broad as long in processing control information based on rebuilding direction.

On the contrary, according to the present invention, according to carrying out the direction managing control information of rebuilding.That is, when carrying out the folk prescription reconstruction, do not delete the control information relevant with this direction (for example controlling PDU), this is different from wherein the correlation technique of deleting whole control informations no matter rebuild direction.

Will be at the above-mentioned universal of various embodiment more detailed descriptions of the present invention and feature.

When carrying out correlation technique RLC reconstruction algorithm, even rebuild for single direction (being transmit direction or receive direction), also PDU is all controlled in deletion.In most of the cases, the data transmission capabilities of this not appreciable impact portable terminal or network.This is because in most of the cases, when receive direction and transmit direction all being carried out when rebuilding, therefore the context of RLC can only change, because Node B has changed or because RNC changes, and restarts to handle faster by ignoring all control informations.And, do the possibility of having eliminated inconsistent in the context of transmitter and receiver (that is non-correspondence) like this.

For some situation, the correlation technique method for reconstructing may be enough.Yet, insert owing to introducing the HSDPA(high-speed downlink packet) and the access of HSUPA(High Speed Uplink Packet) technology, so the situation that RLC rebuilds often takes place.Example can be when the portable terminal that is positioned at (residing in) residential quarter is positioned at the center of residential quarter at first but moves to the border (or edge) of residential quarter.

That is, when portable terminal is positioned at the central area of residential quarter, can use the AM RLC PDU with relatively large size, but when being positioned at cell boarder, the quality deterioration of wireless environment, and therefore, can not use the relatively large AM RLC PDU of size.Therefore, when portable terminal moves to cell boarder or when opposite from the center of residential quarter, although portable terminal still in same residential quarter, but still needs to change the size of the AM RLC PDU that is used by portable terminal.The introducing of HSDPA and HSUPA has allowed to use various types of physical channels and transmission channel, and can use the AM RLC PDU that has optimum size for each physical channel or each transmission channel.Because the size of AM RLC PDU changes, so must rebuild the RLC entity.

Yet in this case, up link and down link are not to change together all the time.This is because the fact of uplink quality and downlink quality possibility different (namely having any different) causes.That is, the degradation of down link does not cause the same degradation degree of up link.Therefore, when the portable terminal that uses HSDPA and HSUPA simultaneously moves to its border or edge from the center of residential quarter, occur downlink quality quite continually and corrupt to the situation that to use HSDPA and still can use the level of HSUPA.Similarly, the HSUPA quality deterioration may take place and HSDPA quality gratifying situation still perhaps when portable terminal moves to center of housing estate from cell boarder, many other situations may take place.In these cases, not need transmitter-side to the receiver direction in rebuild, and only need the reconstruction (for example, only be used for up link or only be used for down link) of respective direction.

Yet, in correlation technique, even under those situations of the reconstruction that only needs a direction, also deletion be used for transmitter-side to whole control PDU of receiver direction.This causes the serious problems of data transmission efficiency aspect as shown in the following examp.

Fig. 7 shows the method for reconstructing when carrying out reset routine.

1. reset routine is from the transmit direction of A side.Transmit reset PDU, and receive reset PDU at the receive direction of B side.

2.B the receiver direction of side form at reset PDU reset Ack PDU and etc. to be transmitted.

With the program of step 2 simultaneously, carry out the reconstruction algorithm at a direction.In B side, take place to be used for transmitter-side to reconstruction algorithm, therefore and, in A side, the reconstruction algorithm of receiver direction takes place to be used for.

4. according to correlation technique, though in step 3, only take place in B side for transmitter-side to reconstruction algorithm, also must deletion whole control PDU.Therefore, must delete the Ack PDU that resets that during step 2, forms but do not transmit as yet.Here, the described Ack of resetting PDU is the PDU that forms at the receiver place of B side, and does not influence the transmitter of B side.

5.A the side waits for the response to the reset PDU of transmission in the step 1, but in B side, because the Ack PDU that resets is deleted, so A side can not receive the response from B side.Therefore, in a single day A side experiences certain hour or just transmit reset PDU when satisfying new condition.

In said procedure, must handle reset routine rapidly.By reset routine, every side's exchange HFNI value and the like, and be devoted to Standardization Communication.For example, if the HFN value of using respectively on the direction of the transmitter of the receiver of B side and A side is different, then can not be correctly decoded data at the receiver place.Therefore, should stop reset routine as early as possible.Yet, have only when transmitter correctly to receive when resetting Ack PDU, could stop reset routine.In said process, even rebuilding with the irrelevant direction that resets, because transmitter and receiver has all been deleted whole control PDU, be delayed so be used for the program of normal exchange control PDU.

This causes having hindered transfer of data and reception when carrying out reset routine, and has not only reduced message transmission rate, and has hindered the correction such as the important state variables of HFNI, and this causes the problem of communication disruption.

Therefore, the invention provides a kind of improvement operation of the AM RLC entity of rebuilding for folk prescription RLC, it has improved message transmission rate and has minimized communication disruption.

In the present invention, during folk prescription RLC reconstruction algorithm, emission side and recipient only delete and its relevant control PDU of direction separately.

That is, when rebuilding the recipient of AM RLC entity, the RLC entity is only deleted those control PDU relevant with receive direction, and does not delete the control PDU relevant with transmit direction.

Similarly, when rebuilding the emission side of AM RLC entity, the RLC entity is only deleted those control PDU relevant with transmit direction, and does not delete the control PDU relevant with receive direction.

Here, the described control PDU relevant with emission side's direction refers to the control PDU by the square one-tenth of emission of RLC entity.

Described control PDU by the square one-tenth of emission comprise such as reset PDU or MRW SUFI will be by the control PDU of emission side active transmission.

The described control PDU that is formed by the recipient comprises the control PDU that will initiatively be sent by the recipient such as reset Ack PDU or MRWAck SUFI.

In above program, not deleted control PDU is transferred to peer-entities immediately.It is just not wait in buffer because control PDU does not have suitable transmittability because low layer more is current that control PDU still stays main cause in the RLC entity.As simple example, suppose a certain RLC entity can per 1 second, per 4 seconds, per 7 seconds etc. transmission primaries PDU, then the control PDU that generated at 2 seconds must many waits 2 seconds in order to when reaching 4 seconds, be transmitted.Yet, during this type of stand-by period, reconstruction algorithm may take place.In this case, in order to stop ongoing program fast, will be effective once the PDU of transmission (wait is transmitted) control immediately takes place to rebuild.Therefore, should immediately the control PDU that is not transmitted the not rebuilt program deletion of Buddhist monk as yet be transferred to reciprocity RLC entity.Therefore, should keep still and to exist and not deleted this type of control PDU is used for transmission.

Therefore, the present invention proposes, at the control PDU that before reconstruction algorithm, forms and be preserved for transmitting, or transmission and by the not deleted control of reconstruction algorithm PDU before reconstruction algorithm, new control PDU should be formed and its transmission should be dispatched again.

In other words, when taking place to be used for the reconstruction algorithm of emission side, the recipient of RLC entity does not delete the whole control PDU that exist at that time, but only deletes those control PDU relevant with recipient's (direction).

In other words, the present invention proposes, and when taking place to rebuild, the recipient of RLC entity does not delete whole existing control PDU, but does not delete the control PDU irrelevant with recipient's (direction).And other control PDU all deletes.

In other words, the present invention proposes, and when taking place to rebuild, the recipient of RLC entity does not delete whole existing control PDU, but does not delete the control PDU relevant with the side of emission (direction).And the control PDU irrelevant with emission side (direction) all deletes.

Here, relevant with recipient's (direction) control PDU can comprise affirmation status report, window SUFI, MRW Ack SUFI and the like.

The control PDU irrelevant with recipient's (direction) can comprise MRW SUFI, reset PDU, Ack PDU and the like resets.

The control PDU relevant with emission side (direction) can comprise MRW SUFI and the like.

The control PDU irrelevant with emission side (direction) can comprise affirmation status report, window SUFL, MRW Ack StTl, reset PDU, Ack PDU and the like resets.

Next, with the example of describing according to the RLC physical operation in the RLC reconstruction algorithm of the present invention.

Fig. 8 shows the exemplary process diagram according to the RLC method for reconstructing in wireless communication system of the present invention.

1. the init state variable arranges the value that can arrange then.

2. the HFN value of receive direction is set according to the value from more high-level indication.

3. delete the AMD PDU of receive direction.

4. if only rebuild at receive direction, then among remaining control PDU, delete the control PDU except the control PDU of transmit direction.

5. remaining control PDU is formed new control PDU.

Here, most important emission side's control PDU is MRW SUFI and reset PDU.Because MRW SUFI is formed separately different control PDU with reset PDU, so the RLC physical operation that has also proposed in the receive direction reconstruction algorithm is as follows:

1. the init state variable arranges the value that can arrange then.

3. delete the AMD PDU of receive direction.

4. if only rebuild at receive direction, then in remaining control PDU, if there is MRW SUFI, then this MRW SUFI is formed new control PDU.

5. in remaining control PDU, if there is reset PDU, then delete the control PDU except reset PDU.

6. the control PDU or the reset PDU that keep any new formation are used for transmission.

From the angle of MRW SUFI and other control PDU, another embodiment of the present invention is as follows:

1. the init state variable arranges the value that can arrange then.

3. delete the AMD PDU of receive direction.

4. if only rebuild at receive direction, then status report, window SUFI, MRW Ack SUFI, reset PDU and the Ack PDU that resets are confirmed in deletion.

5. after above step, in remaining control PDU, if there is MRW SUFI, then this MRW SUFI is formed new control PDU.

6. keep new control PDU and be used for transmission.

In above step 5, described MRW SUFI only is an example, and no matter receive direction, that is that, before rebuilding, form, that before rebuilding, be not transmitted and rebuilding during not deleted control PDU or SUFI all in step 5, be formed new PDU and in step 6, be transmitted.

In above example, the existence of reset PDU means carries out reset routine.Therefore, in this case, the transmission that keeps reset PDU means begin new reset routine after reconstruction algorithm.The present invention proposes, for the reconstruction algorithm on receive direction only, and the whole control PDUs of deletion except MRWSUFI, and if have reset PDU (that is, when carrying out reset routine), this reset routine newly begins.Here, described control PDU except MRW SUFI refers to affirmation status report, window SUFI, MRW Ack SUFI and reset PDU, Ack PDU resets.

In a word, receive direction operation according to the present invention is as follows:

1. the init state variable arranges the value that can arrange then.

3. delete the AMD PDU of receive direction.

5. after above step, if exist in form before rebuilding, be not transmitted before the reconstruction algorithm and in step 4 not deleted any residue control PDU, then this type of control PDU is formed new control PDU.

6. keep the new control PDU that forms and be used for transmission.

7. in above step 4, if there is deleted control PDU, that is, if before reconstruction algorithm, there is ongoing reset routine, then forms and transmit reset PDU.That is the new reset routine of beginning.

In other words, when reconstruction algorithm (for emission side's direction) took place, the whole control PDU that exist did not at that time delete in the emission side of RLC entity, but only deleted those control PDU relevant with emission side (direction).

In other words, the present invention proposes, and when rebuilding (for emission side's direction), whole existing control PDU do not delete in the emission side of RLC entity, but do not delete the control PDU irrelevant with the side of emission (direction).And other control PDU all deletes.

In other words, the present invention proposes, and when rebuilding (for emission side's direction), whole existing control PDU do not delete in the emission side of RLC entity, but do not delete the control PDU relevant with recipient's (direction).And the control PDU irrelevant with recipient's (direction) all deletes.

Here, relevant with emission side (direction) control PDU can comprise MRW SUFI and the like.

The control PDU irrelevant with emission side (direction) can comprise affirmation status report, window SUFI, MRW Ack SUFI, reset PDU, Ack PDU and the like resets.

The control PDU relevant with recipient's (direction) can comprise affirmation status report, window SUFI, MRW Ack SUFI and the like.

In one embodiment, the present invention proposes the following operation when rebuilding emission side's (direction) of RLC:

1. the init state variable arranges the value that can arrange then.

2. the HFN value of transmit direction is set according to the value from more high-level indication.

3. for the only reconstruction on transmit direction, from step 4 beginning executive program.All rebuild for transmitter and receiver, from step 9 beginning executive program.

4. among the SDU of emission side, delete the SDU that has been transmitted fully.

5. among the control PDU in being present in the RLC entity, if there is MRW Ack SUFI, then this MRW Ack SUFI is formed new control PDU.

6. after step 5, the Ack PDU that resets in residue control PDU, deletion is control PDU all.That is, among the control PDU that formed before reconstruction algorithm, deletion is all controlled PDU(except the Ack PDU that resets).

7. come to cut apart again again as the result of step 4 and not deleted SDU according to the RLC size that arranges.

8. from step 10 beginning executive program.

9. the control PDU of Receiver And Transmitter is all deleted, and the AMDPDU in the deletion transmitter.

10. stop the timer except Timer_poll_periodic and Timer_status_periodic.

As another embodiment, the present invention proposes the following operation when rebuilding emission side's (direction) of RLC:

1. the init state variable arranges the value that can arrange then.

5. among the control PDU in being present in the RLC entity, deletion is all controlled PDU(except the control PDU relevant with receive direction).

6. after step 5, remaining other control PDU is formed new control PDU and keeps transmission.

8. from step 10 beginning executive program.

10. stop the timer except Timer_poll_periodic and Timer_status_periodic.

In above example, the existence of the Ack PDU that resets means carries out reset routine.Therefore, in this case, the transmission that keeps the Ack PDU that resets means begin reset routine after reconstruction algorithm.The present invention proposes, for the reconstruction algorithm on transmit direction only, deletion all control PDU(except the control PDU relevant with receive direction), and if existence reset Ack PDU(namely when carrying out reset routine), this reset routine newly begins.Here, described control PDU except those control PDU relevant with receive direction refers to MRW SUFI and reset PDU, Ack PDU resets.

In a word, transmit direction operation according to another embodiment of the present invention is as follows:

1. the init state variable arranges the value that can arrange then.

3. for the only reconstruction on transmit direction, from step 4 beginning executive program.All rebuild for transmitter and receiver, from step 10 beginning executive program.

4. in the SDU of emission side, delete the SDU that has been transmitted fully.

5. in being present in the control PDU of RLC entity, deletion is all controlled PDU(except those control PDU relevant with receive direction).Here, the described control PDU relevant with receive direction is that notice is about the control PDU of recipient's environment.For example, expression correctly receive or do not receive which PDU the affirmation status report, adjust the window SUFI of the window size that can be received, as the MRWAck SUFI of the recipient's response message that sends for MRW SUFI, SDU information that described MRW SUFI notice abandons about the side of emission and the like.

6. after above step, if exist in form before rebuilding or be not transmitted before the reconstruction algorithm and still exist and deleted any control PDU in step 5 not, then this type of control PDU is formed new control PDU.

7. in above step, keep the transmission of the new control PDU that forms.

8. come to cut apart again again as the result of step 4 and not deleted SDU according to the RLC size that arranges.

9. from step 11 beginning executive program.

10. the control PDU of Receiver And Transmitter is all deleted, and the AMD PDU in the deletion transmitter.

11. stop the timer except Timer_poll_periodic and Timer_status_periodic.

In above operation, when when transmit direction is rebuild, only carry out the program of the SDU that has been transmitted fully among those SDU of deletion transmit direction.But when considering the situation that both direction is in fact all rebuild, this type of reconstruction of both direction can be considered to initialization RLC entity itself, and therefore can change the generation of above step.

And in above-mentioned steps 8, cutting apart again with control PDU of data PDU is irrelevant, therefore is not subjected to the influence of sequential order.For example, can be after step 4 execution in step 8 at once.

As mentioned above, the invention provides a kind of method, wherein, if the RLC entity is rebuilt, then whether only be used for a direction no matter rebuild, all do not delete whole control PDU, but only optionally delete those control PDU relevant with specific direction, and be transmitted in the reconstruction control PDU of new formation afterwards immediately.As a result, shorten communication opening time, improved RLC message transmission rate etc., therefore improved user satisfaction.

The disclosure provides a kind of method for reconstructing for the affirmation mode radio link control entity, and this method comprises: receive order from higher level's entity and rebuild to carry out the control of affirmation mode Radio Link; And control the direction of rebuilding by consideration affirmation mode Radio Link and manage the control protocol data cell.Delete the control protocol data cell relevant with this direction.Do not delete the control protocol data cell with this orientation independent.This method can also comprise: scheduling controlling PDU rebuilds transmission afterwards to be used for the control of affirmation mode Radio Link.Described higher level's entity is radio resource control layer.Described affirmation mode Radio Link control is reconstituted on the transmit direction to be carried out.Described affirmation mode Radio Link control is reconstituted on the receive direction to be carried out.

And the disclosure provides a kind of scheme of the reconstruction for radio link control entity, and this scheme comprises: the reconstruction of the entity that determines to carry on an agreement; And come processing control information by the reconstruction direction of considering protocol entity.Described protocol entity is affirmation mode Radio Link entity.Described decision is based on the order that receives from upper layer entity.The form of control protocol data cell is adopted in described control information.Described affirmation mode Radio Link control is reconstituted on the transmit direction to be carried out.Described affirmation mode Radio Link control is reconstituted on the receive direction to be carried out.

In addition, the disclosure also provides a kind of protocol stack of supporting the reconstruction of radio link control entity, and this protocol stack comprises: radio resource control layer, and it is suitable for providing instruction to carry out the reconstruction of lower level; And wireless chain control layer, itself and radio resource control layer co-operation also are adapted to pass through and consider the direction of rebuilding and rebuild based on carrying out from the instruction of radio resource control layer.

Should be noted that feature of the present invention relates to the problem about enhancing and the evolution of 3GPP standard.Similarly, 3GPP TS25.322 and relevant section thereof or its part with and various enhancing just under development belong to the present invention.Can be expressly understood that it only is exemplary being used for description mark of the present invention (labeling) and term, and therefore may be owing to ongoing or discussion in the future change (or illustrating later on).

This specification has been described various illustrative embodiment of the present invention.The scope intention of claim is to contain various modifications and the equivalent arrangements of disclosed illustrative embodiment in this specification.Therefore, should give the reasonably broad interpretation of following claim to contain modification, equivalent structure and the feature that meets the spirit and scope of the present invention disclosed herein.

Claims

1. method for reconstructing that is used for the affirmation mode radio link control entity, this method comprises:

Carry out affirmation mode Radio Link control AM RLC volume reconstruction by the radio resource control RRC entity; And

Recipient iff rebuilding described AM RLC entity then deletes all the control protocol data cell PDU except at least one first control protocol data cell PDU relevant with the emission side of described AMRLC entity; And,

Iff the emission side that rebuilds described AM RLC entity, then delete all the control protocol data cell PDU except at least one second control protocol data cell PDU relevant with the recipient of described AMRLC entity.

2. according to the process of claim 1 wherein, at least one first control protocol data cell relevant with the emission side of described AM RLC entity comprises at least one among MRW SUFI and the POLL SUFI.

3. according to the process of claim 1 wherein, at least one second control protocol data cell relevant with the recipient of described AM RLC entity comprises at least one that confirm among status report, window SUFI and the MRW ACK SUFI.

4. according to the method for claim 1, also comprise:

Dispatch described control protocol data cell, be used for the control of affirmation mode Radio Link and rebuild transmission afterwards.

5. according to the process of claim 1 wherein, described affirmation mode Radio Link control is reconstituted on the transmit direction to be carried out.

6. according to the process of claim 1 wherein, described affirmation mode Radio Link control is reconstituted on the receive direction to be carried out.

7. reconstructing apparatus that is used for the affirmation mode radio link control entity, this equipment comprises:

Device is used for carrying out affirmation mode Radio Link control AM RLC volume reconstruction by the radio resource control RRC entity; And

Device is used for then deleting all the control protocol data cell PDU except at least one first control protocol data cell PDU relevant with the emission side of described AM RLC entity iff the recipient who rebuilds described AM RLC entity; And,

Device is used for then deleting all the control protocol data cell PDU except at least one second control protocol data cell PDU relevant with the recipient of described AM RLC entity iff the emission side that rebuilds described AM RLC entity.

8. according to the equipment of claim 7, wherein, at least one first control protocol data cell relevant with the emission side of described AM RLC entity comprises at least one among MRW SUFI and the POLL SUFI.

9. according to the equipment of claim 7, wherein, at least one second control protocol data cell relevant with the recipient of described AM RLC entity comprises at least one that confirm among status report, window SUFI and the MRW ACK SUFI.