CN102958073A

CN102958073A - Method for UE (user equipment) to acquire timing advance (TA) while supporting parallel PRACH (physical random access channel) transmission

Info

Publication number: CN102958073A
Application number: CN2011102402068A
Authority: CN
Inventors: 高兴航; 潘瑜; 高伟东; 张欢; 吴联海; 林佩; 张莉莉; 池连刚
Original assignee: Potevio Institute of Technology Co Ltd
Current assignee: Petevio Institute Of Technology Co ltd
Priority date: 2011-08-19
Filing date: 2011-08-19
Publication date: 2013-03-06
Anticipated expiration: 2031-08-19
Also published as: CN102958073B

Abstract

The invention provides a method for UE (user equipment) to acquire timing advance (TA) while supporting parallel PRACH (physical random access channel) transmission. The method includes: on a network side, distributing PRACH resources capable of assisting in calculating different RA-RNTI values and/or distributing different special permeable codes on parallel SCells for the UE in each of random accessing processes which are executed on the UE in parallel and initiated on the SCells; and/or, carrying the TA and the TA group information thereof by RAR messages; and/or carrying the TA group information used for indicating the TA by MAC CE or RRC(radio resource control) signaling, and utilizing the indication information carried by the MAC sub head or new LCID value to indicate the MAC CE or RRC signaling, and then by the UE, monitoring and decoding the PDCCH to receive self messages according C-RNT, and extracting the corresponding TA and the TA group information thereof. By the method, the UE can determine the TA groups corresponding to the different TA according to the received RAR message or the MAC CE or PRC signaling messages, so that the TA groups corresponding to the different TA can be distinguished correctly.

Description

Support the UE of parallel PRACH transmission to obtain the method for Timing Advance

Technical field

The present invention relates to the technology of obtaining of Timing Advance in the communication system, particularly support the UE of parallel PRACH transmission to obtain the method for Timing Advance.

Background technology

Random access technology is an important technology of media access control in the communication system.Can obtain uplink timing advance (TA) by random access procedure.Random access mainly contains two kinds of patterns, based on the random access of competition with based on non-competing random access.Fig. 1 is noncompetitive pattern random access procedure figure in the existing Release-10 agreement, and specifically this random access procedure comprises:

Step 0:eNB indication UE accesses used lead code (Msg0) at random;

Particularly, the content of Msg0 comprises that UE initiates PRACH channel resource and Special leader (Preamble) code that non-competing random access is used.

Step 1:UE sends above-mentioned lead code (Msg1) in ascending physical signal Random Access Channel PRACH;

Particularly, the PRACH channel resource that obtains in step 0 of UE sends special-purpose Preamble code.

Step 2:eNB is at DL-SCH channel accidental access response (Msg2);

Particularly, eNB utilizes this RA-RNTI scrambling PDCCH that calculates according to the PRACH Resource Calculation RA-RNTI that distributes, and the position of the indication of the PDCCH after this scrambling transmission accidental access response (RAR) message on PDSCH; RAR message is carried in relevant position on PDSCH.Wherein, the RAP ID in the RAR message is preamble information, also comprises uplink timing advance (TA) in this RAR message simultaneously.UE receives the PDCCH with the RA-RNTI scrambling, to determine the resource location information on the PDSCH; On the respective resources position of PDSCH, receive RAR message according to RAP ID.

In the Release-10 agreement, RAN4 has stipulated to be supported at most and has carried out intra-band carrier aggregation and/or inter-band carrier aggregation in 2 band.In the wireless communication system in future, various new business can continue to bring out, and the requirement of uplink service speed is more and more higher.Along with carrying out the increase of carrier aggregation band quantity, in Rel-11 and later release, support the UE of inter-band carrier aggregation to get more and more, thereby the demand of the many TA of needs also can be increasing.RAN2 is clear and definite at present, supports the UE of many TA will support at least 2 TA groups.

Support many TA scene for Release-11, RAN2 has discussed and has determined to support UE to carry out the TA value that random access procedure obtains different TA groups at SCell, the conclusion of having reached at present is, SCell in different TA groups carries out random access procedure, thereby obtain the TA value of corresponding TA group, the concrete processing mode of having determined is as follows:

1. be supported in and carry out noncompetitive pattern on the SCell and access at random;

2. support to send random access resource by PDCCH Order mode;

3.Msg0 be that PDCCH Order sends at dispatching cell;

4.Msg1 can only send at the SCell that accesses at random;

Except above-mentioned 4 are determined, also have following 2 just under discussion:

5.RAR and the transmission position of corresponding PDCCH;

6. whether can carry out simultaneously the PRACH transmission.

With regard to above-mentioned the 5th point, if send RAR and corresponding PDCCH at SCell, so can there are the following problems:

Random access procedure in the Release-10 agreement as shown in Figure 1 only support that UE accesses at random at PCell, and RAR message sends at PCell.Only at public search space, therefore, UE monitors the public search space of PCell in the flow process shown in Figure 1 with the PDCCH of RA-RNTI scrambling, to receive the PDCCH of RA-RNTI scrambling.If send RAR message at SCell, then need at the PDCCH of SCell monitoring with the RA-RNTI scrambling, also just need to monitor the public search space of SCell.And support that UE carries out the monitoring of SCell public search space, and can increase the blind solution to public search space, need very large power consumption, and also increased to a certain extent the complexity that UE processes.

If still send RAR and corresponding PDCCH at PCell, and still utilize RA-RNTI scrambling PDCCH, just can only allow UE at the public search space of PCell monitoring with RA-RNTI scrambling PDCCH.But because RA-RNTI and the dedicated preamble used in the random access procedure all are the cell-level parameters, therefore, identical RA-RNTI and dedicated preamble can be used in different residential quarters.Identical RA-RNTI and dedicated preamble have been used if there is a plurality of UE, the RAR information that may cause some UE to receive receiving with the PDCCH of RA-RNTI scrambling and by the RAP ID indication in the MAC head does not to one's name finally cause these UE to obtain the TA value of mistakes.

With regard to above-mentioned the 6th point, if support parallel PRACH transmission, can obviously reduce propagation delay time, but same UE just may occur and when parallel PRACH transmission, use identical RA-RNTI and dedicated preamble, this UE obtains the indication of RAR resource at the PDCCH that its PCell monitors with the RA-RNTI scrambling so, and when obtaining corresponding RAR according to RAP ID, UE can't distinguish which TA group that TA among the RAR of reception comes from UE.

Summary of the invention

The invention provides the method that the UE that supports parallel PRACH transmission obtains Timing Advance, can when walk abreast the PRACH transmission, correctly receive and distinguish TA value corresponding to different TA groups, do not increase the complexity that UE processes simultaneously.

For achieving the above object, the present invention adopts following technical scheme:

A kind of UE of parallel PRACH transmission that supports obtains the method for Timing Advance, comprising:

Be each mutually different RA-RNTI of parallel PRACH transmission configuration and/or dedicated preamble of described UE, and initiate parallel random access procedure at the SCell of described UE, UE sends dedicated preamble corresponding to described each parallel PRACH transmission at SCell;

To in described each parallel PRACH transmission each, network side sends the PDCCH that transmits corresponding RA-RNTI scrambling with this PRACH at the PCell of described UE, and utilizes described PDCCH indication to comprise the position of the accidental access response RAR of the dedicated preamble that this PRACH transmission is corresponding;

Described UE monitors the PDCCH of each parallel PRACH transmission at PCell, and according to the dedicated preamble in the RAR message of the RA-RNTI of each PDCCH scrambling and/or each PDCCH indication, determine that PRACH corresponding to timing advance TA that carries in the RAR message of each PDCCH indication transmits, determine again the TA group corresponding to TA of carrying in each described RAR message.

Preferably, describedly comprise for the mutually different RA-RNTI of each parallel PRACH transmission configuration of UE: be each parallel PRACH transmission configuration PRACH resource of UE, and guarantee different according to each RA-RNTI of described PRACH Resource Calculation.

Described UE parallel carry out in each random access procedure that SCell initiates, in the accidental access response RAR of each described random access procedure message, carry the group of the TA under TA information in this RAR message;

Described UE is according to the corresponding TA of RAR message extraction that receives and the group of the TA under it information.

Preferably, describedly carry in the RAR of each random access procedure message that the TA group information under the TA comprises in this RAR message:

Newly-increased byte before the first byte of Release-10 agreement MAC RAR form, and first bit that should increase byte is set to 1 utilizes all the other bits of newly-increased byte to carry that the affiliated TA of TA organizes information in this RAR message.

Preferably, utilize all the other bits of newly-increased byte to carry described TA group information to be:

Utilize 3 bits in described all the other bits to represent described TA group information.

The MAC RAR that will have in the described RAR message of same UE of identical MAC head merges, and before the first byte of first MAC RAR newly-increased byte, the first bit of this newly-increased byte is set to 1, according to the corresponding relation of predefined all the other bits of newly-increased byte and each TA group, be 1 with the bit set corresponding with TA group under each TA of comprising among each the MAC RAR that merges;

To add the above identical MAC head before the MAC RAR after merging.

The MAC RAR that will have in the described RAR message of same UE of identical MAC head merges, and before the first byte of each MAC RAR newly-increased byte, the first bit of this newly-increased byte is set to 1, the second bit as extension field, is also comprised next MAC RAR represent this MAC RAR when described the second bit set is 1 after; Utilize in the described newly-increased byte all the other bits except the first bit and the second bit to carry the group of the TA under TA information among the corresponding MAC RAR;

To add the above identical MAC head before the MAC RAR after merging.

Preferably, the interim C-RNTI field in each described RAR message is set to the C-RNTI that distributes for described UE.

Described UE parallel carry out in each random access procedure that SCell initiates, utilizing be the C-RNTI scrambling PDCCH that described UE distributes, the positional information of message on PDSCH that indication is used for carrying TA and TA organizes information under it;

Described UE receives for the message of carrying TA and TA organizes information under it according to the resource location that the PDCCH with described C-RNTI descrambling indicates.

It is preferably, described that the message of TA group information is under TA and its: RAR message be used to carrying.

Preferably, described RAR message is carried the mode of the described TA group of TA and its information and is:

Preferably, the mode that described RAR message is carried TA and TA organizes information under it is:

The MAC RAR that will have in the described RAR message of same UE of identical MAC head merges, and before the first byte of first MAC RAR newly-increased byte, the first bit of this newly-increased byte is set to 1, according to the corresponding relation of predefined all the other bits of newly-increased byte and each TA group, bit set that will be corresponding with TA group under each TA of comprising among each the MAC RAR that merges;

To add the above identical MAC head before the MAC RAR after merging.

It is preferably, described that the message of TA group information is under TA and its: self-defining MAC control information unit be used to carrying; Wherein, the LCID in the corresponding MAC head of described MAC CE is that the binary code of reservation logic channel logo is any one value in 01011 to 11010 value, is used to indicate described MAC CE for carrying TA and TA group information under it.

It is preferably, described that the message of TA group information is under TA and its: self-defining MAC CE be used to carrying; Wherein, in the corresponding MAC head of described MAC CE, the first bit or the second bit are set to 1, be used to indicate this MAC CE and be used for carrying absolute TA and its affiliated TA group information, and LCID is set to LCID corresponding to TAC MAC CE.

Preferably, the mode that described MAC CE carries TA and TA organizes information under it is:

In described MAC CE, utilize the subelement that is consisted of by per two bytes to carry absolute TA and the group of the TA under it information in the random access procedure of described UE; And first bit of described each subelement is set to extension field, also comprises next subelement represent this subelement when described extension field bit set after; Utilize that all the other bits except the extension field bit carry absolute TA and the group of the TA under it information in the first byte of each subelement.

Preferably, preset 7 bits of the first byte among the described MAC CE and the one-to-one relationship of all TA group;

The mode that described MAC CE carries TA and TA organizes information under it is: in the first byte of described MAC CE, and according to predefined described corresponding relation, bit set that will be corresponding with TA group under TA corresponding to described each random access procedure; Comprise N subelement after described the first byte, each subelement comprises two bytes, is used for carrying successively each TA that described the first byte is set and organizes corresponding absolute TA; Wherein, the TA number of described N for carrying among this MAC CE.

The mode that described MAC CE carries TA and TA organizes information under it is: in the first byte of described MAC CE, and according to predefined described corresponding relation, bit set that will be corresponding with TA group under TA corresponding to described each random access procedure; After described the first byte, carry successively absolute TA corresponding to each TA group that is set in described the first byte.

It is preferably, described that the message of TA group information is under TA and its: self-defining MAC CE be used to carrying; Wherein, the LCID in the corresponding MAC head of described MAC CE is LCID corresponding to TAC MAC CE.

In described MAC CE, utilize the subelement that is consisted of by per two bytes to carry absolute TA and the group of the TA under it information in the random access procedure of described UE; And first bit of described each subelement is set to 1, the second bit and is set to extension field, also comprises next subelement represent this subelement when described extension field bit set after; Utilize all the other bits except the first bit and extension field bit in each subelement to carry absolute TA and the group of the TA under it information.

Preferably, preset the 2-8 bit of the first byte among the described MAC CE and the one-to-one relationship of all TA group;

Described MAC CE carries that the mode of TA group information is under TA and its: in the first byte of described MAC CE, the first bit is set to 1, and being used to indicate what carry is absolute TA; According to predefined described corresponding relation, bit set that will be corresponding with TA group under TA corresponding to described each random access procedure; Comprise N subelement after described the first byte, each subelement comprises two bytes, is used for carrying successively each TA that described the first byte is set and organizes corresponding absolute TA; Wherein, the TA number of described N for carrying among this MAC CE.

Described MAC CE carries that the mode of TA group information is under TA and its: in the first byte of described MAC CE, the first bit is set to 1, and being used to indicate what carry is absolute TA; According to predefined described corresponding relation, bit set that will be corresponding with TA group under TA corresponding to described each random access procedure; After described the first byte, carry successively absolute TA corresponding to each TA group that is set in described the first byte.

It is preferably, described that the message of TA group information is under TA and its: RRC reconfiguration message or self-defined RRC message be used to carrying.

As seen from the above technical solution, provide three kinds of TA and TA group information getting method among the present invention, in the first method, each mutually different RA-RNTI of parallel PRACH transmission configuration and/or dedicated preamble for UE, thereby so that UE is when monitoring PDCCH, can distinguish according to different RA-RNTI the resource location at the RAR message place of different TA groups, and/or distinguish the RAR message of different TA groups according to different dedicated preamble, also just can distinguish TA value corresponding to different TA groups.

In the second method, change the form of present RAR message, utilize RAR message after the change carry TA with and affiliated TA group information, thereby the TA group corresponding to different TA that UE is distinguished belong to self; Simultaneously, the interim C-RNTI field of the RAR message after change is set to the C-RNTI that distributes for UE, thereby makes UE can correctly distinguish the RAR message of self and other UE.

In the third method, utilize the message of new definition to carry TA and affiliated TA group information thereof, thereby distinguish the TA of different TA groups; Simultaneously, think the C-RNTI scrambling PDCCH that UE distributes, indicate the positional information of above-mentioned new definition message on PDSCH, to distinguish the TA information of different UEs.

Description of drawings

Fig. 1 is noncompetitive pattern random access procedure schematic diagram in the existing Release-10 agreement;

Fig. 2 a is the first expansion RAR form that provides among the embodiment two.

Fig. 2 b is the second expansion RAR form that provides among the embodiment two.

Fig. 2 c is the third expansion RAR form that provides among the embodiment two.

Fig. 3 a is MAC head corresponding to first kind MAC CE form that provides among the embodiment three.

Fig. 3 a (1) is the concrete form of the first in the first kind MAC CE form that provides among the embodiment three.

Fig. 3 a (2) is the concrete form of the second in the first kind MAC CE form that provides among the embodiment three.

Fig. 3 a (3) is the third the concrete form in the first kind MAC CE form that provides among the embodiment three.

Fig. 3 b is MAC head corresponding to Equations of The Second Kind MAC CE form that provides among the embodiment three.

Fig. 3 b (1) is the concrete form of the first in the Equations of The Second Kind MAC CE form that provides among the embodiment three.

Fig. 3 b (2) is the concrete form of the second in the Equations of The Second Kind MAC CE form that provides among the embodiment three.

Fig. 3 b (3) is the third the concrete form in the Equations of The Second Kind MAC CE form that provides among the embodiment three.

Fig. 3 c is MAC the concrete form of the first corresponding to the 3rd class MAC CE form that provides among the embodiment three.

Fig. 3 d is MAC the concrete form of the second corresponding to the 3rd class MAC CE form that provides among the embodiment three.

Embodiment

For making purpose of the present invention, technological means and advantage clearer, below in conjunction with accompanying drawing the present invention is described in further details.

Basic thought of the present invention is: support the UE of parallel PRACH transmission, when during initiating random access procedure, in sending to the message of carrying TA value of UE, distinguishing the affiliated TA of corresponding TA value and organize information on a plurality of SCell simultaneously.

Here, once PCell and the SCell of UE at first are described.In carrier aggregation technology, all there are a main plot (PCell) and one or more auxiliary residential quarter (SCell) for any carrier aggregation UE.UE at first accesses at random at PCell, and sets up the RRC connection; After the random access on the PCell was finished, UE was assigned with C-RNTI, and this is identified at, and the whole network is unique to refer to corresponding UE.

Provide three kinds of different TA acquisition methods among the present invention, can be the different TA groups under each TA of certain UE differentiation reception.Next, by three embodiment this two kinds of concrete grammars are described respectively.

Rel-11 does not have the demand of increase for the scene of supporting many TA to the quantity of CC, configure at most 5 CC.If consider the demand of up-downgoing symmetrical service, up configurable 5 TA organize (if each CC regards an independent TA group as) to greatest extent.Therefore, use the affiliated TA group index of 3 bit identification in the following examples.

Wherein, in first method, the PDCCH that scheduling RAR message is set still transmits at PCell.And if restriction RAR and corresponding PDCCH only send at PCell, the UE that accesses at random under different PCell or at same SCell, can there be any problem in the realization of random access procedure.Particularly, because RA-RNTI and the dedicated preamble used in the random access procedure all are cell-level, and at present prior art for all be that different UEs is carried out random access procedure under the same residential quarter, although these UE RA-RNTI may identical (RA-RNTI that goes out according to different PRACH Resource Calculations may be identical), carry out noncompetitive pattern when accessing at random dedicated preamble certainly not identical.Therefore, even used identical RA-RNTI, also can correctly receive according to the difference of dedicated preamble RAR separately.

Yet, among the present invention, suppose that UE supports parallel PRACH transmission, and meeting while initiating random access procedure on a plurality of SCell, to obtain the TA value of TA group corresponding to different SCell.That is to say, the parallel random access procedure that carries out of UE relates to a plurality of residential quarters among the present invention, and the use of RA-RNTI and dedicated preamble is mutually not restrict between different districts.In this case, if same UE is thrown the reins in RA-RNTI and the dedicated preamble of different SCell, just might identical RA-RNTI and dedicated preamble when parallel PRACH transmission, have been used by this UE, this UE is when its PCell monitors that PDCCH with the RA-RNTI scrambling obtains the indication of RAR resource and obtains corresponding RAR according to RAPID so, can't distinguish which TA group that TA among the RAR of reception comes from UE according to prior art UE.

For above-mentioned situation, the present invention provides the method that following the first is specifically obtained TA.

Embodiment one:

In the present embodiment, be each mutually different RA-RNTI of parallel PRACH transmission configuration and/or dedicated preamble of UE.Like this, by RA-RNTI and/or dedicated preamble, can distinguish each the parallel PRACH transmission that belongs to same UE, thereby can distinguish the TA group corresponding from different PRACH transmission.And for other processing of parallel PRACH transmission, still identical with existing mode.

Particularly, this method of obtaining TA comprises: be each mutually different RA-RNTI of parallel PRACH transmission configuration and/or dedicated preamble of UE, and at the parallel random access procedure of the SCell of this UE initiation, UE sends dedicated preamble corresponding to each parallel PRACH transmission at SCell; To in each parallel PRACH transmission each, network side sends the PDCCH that transmits corresponding RA-RNTI scrambling with this PRACH at the PCell of UE, and utilizes the PDCCH indication to comprise the position of the accidental access response RAR of the dedicated preamble that this PRACH transmission is corresponding; UE monitors the PDCCH of each parallel PRACH transmission at PCell, and according to the dedicated preamble in the RAR message of the RA-RNTI of each PDCCH scrambling and/or each PDCCH indication, determine that PRACH corresponding to timing advance TA that carries in the RAR message of each PDCCH indication transmits, determine again the TA group corresponding to TA of carrying in each RAR message.

Specifically when the different RA-RNTI of each the parallel PRACH transmission configuration that is UE, be to be each parallel PRACH transmission configuration PRACH resource of UE according to existing mode still, and guarantee that when distributing the PRACH resource each RA-RNTI that goes out according to corresponding PRACH Resource Calculation is different.

The present embodiment can compatible R9/R10, only monitors the public search space of the PDCCH of RA-RNTI scrambling at PCell.

Embodiment two:

In the present embodiment, expand existing RAR form, increase the affiliated TA group sign of corresponding TA, thereby can make UE correctly distinguish TA group corresponding to RAR.Except the RAR form was made amendment, other processing that relate to random access procedure in the present embodiment can be identical with existing mode.

Method in concrete the present embodiment comprises: UE parallel carry out in each random access procedure that SCell initiates, in the RAR of each random access procedure message, carry the group of the TA under TA information in this RAR message; UE extracts corresponding TA and the group of the TA under it information according to the RAR message that receives.

In said method, for the modification of RAR form, the mode of namely carrying TA group information can preset as required.Provide the carrying mode of several recommendations in following the present embodiment, concrete, before the first byte of existing RAR form, increase a byte, and the first bit that increases in the byte is set to P.Because RAR the first bit of the prior art is reserved bit, fixedly value is 0, therefore, will expand fixedly value 1 of RAR the first bit P, can distinguish over existing RAR form, and the information in the indication form is for expansion RAR.

Fig. 2 a is the first expansion RAR form that provides in the present embodiment.As shown in Figure 2, this RAR form utilizes regular length only to carry the relevant information of the TA group of a UE.Particularly, this RAR form is newly-increased byte on existing Release-10 agreement MAC RAR form basis, and first bit that will increase byte newly is made as P, and fixedly value is 1; And utilize rear three bits indication TA of newly-increased byte to organize information.All the other bit R are reserved bit.

Fig. 2 b is the second expansion RAR form that provides in the present embodiment.Shown in Fig. 2 b, this RAR form employing bitmap mode indicates to comprise which TA group relevant information in the UE information.This expression mode is applicable to corresponding MAC the identical situation of a plurality of expansion RAR, a plurality of expansion RAR of identical MAC head can be merged, and to reduce expense, specifically can comprise a plurality of TA group information of a UE.

Particularly, the MAC RAR that this RAR form will have in the RAR message of same UE of identical MAC head merges, and before the first byte of first MAC RAR newly-increased byte, the first bit of this newly-increased byte is set to 1, according to the corresponding relation of predefined all the other bits of newly-increased byte and each TA group, bit set that will be corresponding with TA group under each TA of comprising among each the MAC RAR that merges; To add identical MAC head before the MAC RAR after merging.Write the C-RNTI that corresponding UE has distributed in interim C-RNTI field.Unique UE identifies because C-RNTI is the whole network, therefore can distinguish different UEs.In Fig. 2 a, next the first byte is that a plurality of MAC RAR merge for newly-increased byte.

Fig. 2 c is the third expansion RAR form that provides in the present embodiment.Shown in Fig. 2 c, the TA group relevant information of the relevant information that many TA of a UE that this RAR form adopts the variable-length carrying to have identical MAC head organize or a plurality of UE.This expression mode is equally applicable to corresponding MAC the identical situation of a plurality of expansion RAR, a plurality of expansion RAR of identical MAC head can be merged, to reduce expense.

Particularly, the MAC RAR that will have in the RAR message of same UE of identical MAC head merges, and before the first byte of each MAC RAR newly-increased byte, the first bit of this newly-increased byte is set to 1, with the second bit E as extension field, be also to comprise next MAC RAR after when the second bit set is 1, representing this MACRAR, namely also comprise next RAR information; All the other bits in the newly-increased byte of utilization except the first bit and the second bit carry the group of the TA under TA information among the corresponding MAC RAR; To add identical MAC head before the MAC RAR after merging.Write the C-RNTI that corresponding UE has distributed in interim C-RNTI field, in order to identify corresponding UE.

Certainly, above-mentioned only for the present embodiment provides three kinds of concrete expansion RAR forms, those skilled in the art can carry out the expansion of RAR form as required, are used for carrying corresponding TA group information.Here just repeat no more.

In addition, owing to being present in public search space with the PDCCH of RA-RNTI scrambling, if therefore RA-RNTI is identical, then is used to indicate between the PDCCH of RAR message of different UEs and can't distinguishes.If special-purpose lead code is also identical in the RAR message that further PDCCH indicates, so just can't distinguish the TA between different UEs.Based on this, in the present embodiment, further preferably, writing in interim C-RNTI field in each RAR message can be the C-RNTI of corresponding UE distribution, like this, UE can accurately receive the RAR message that belong to self according to the value of this field.Even different UEs is used identical RA-RNTI and dedicated preamble, also can belong to by the interim C-RNTI field identification of corresponding RAR message the RAR message of self.

Embodiment three:

Described in embodiment two, monitor the PDCCH of RA-RNTI scrambling if utilize prior art, with indication RAR resource, because RA-RNTI is cell-level, and pass through the PDCCH of RA-RNTI scrambling at public search space, therefore, a plurality of UE have used identical RA-RNTI, may cause UE to receive the RAR problem that does not belong to self.

Consider that the random access procedure that UE carries out on the SCell mainly is in order to obtain the absolute TA value of corresponding TA group, and set up the RRC connection during random access procedure of UE on carrying out SCell, and distributed unique C-RNTI, so the present embodiment is by a kind of new MAC control information unit (CE) form or RRC signaling, perhaps the expansion RAR form among the embodiment two carries TA value and relevant TA group sign, the MAC CE of carrying TA information, RAR message can PCell or arbitrarily SCell send, the RRC signaling sends at PCell, and the PDCCH by the C-RNTI scrambling indicates to obtain in the accidental access response window.

Restriction when the processing of the present embodiment is not subjected to RA-RNTI and lead code configuration, and the also not restriction of deployment position to carrying relevant TA information, as long as PCell or the SCell that has activated arbitrarily have downlink resource to transmit, its compatibility the transmission means of Rel-10 version TAC MAC CE, scheduling flexibly, and capacity that can elevator system.

Particularly, method in the present embodiment comprises: UE parallel carry out in each random access procedure that SCell initiates, utilize to be the C-RNTI scrambling PDCCH of UE distribution, indication is for the positional information of message on PDSCH of carrying TA and TA organizes information under it; UE receives for the message of carrying TA and TA organizes information under it according to the resource location that the PDCCH with its C-RNTI descrambling indicates.Wherein, the message of carrying TA and its affiliated TA group information specifically can be a new MAC CE or RRC signaling, carries the absolute TA value that UE needs, and the affiliated TA group information of sign, and indicates to obtain by the PDCCH of C-RNTI scrambling.

Next, the present embodiment provides the self-defined message form of several recommendations, and being divided into is three kinds, and a kind of is expansion RAR message among the embodiment two, and another kind is MAC CE, last a kind of is the RRC signaling.

Wherein, for the first self-defined message form, i.e. expansion RAR message among the embodiment two, identical among its concrete form and the embodiment two, just repeat no more here.

In new MAC CE, because absolute TA value needs 11 bits, so need 11 bits to carry absolute TA value in the new MAC CE form of introducing in the present embodiment.Because the new MAC CE that introduces need to transmit at DL-SCH, need a LCID to indicate the affiliated type of MAC CE.

New MAC CE can be divided three classes.In the first kind LCID of the corresponding MAC head of MAC CE redefined; The LCID of the corresponding MAC head of MAC CE is set to existing value in Equations of The Second Kind and the 3rd class.

Particularly, Fig. 3 a is MAC head corresponding to first kind MAC CE form.Wherein, newly define a LCID, be used to indicate the MAC CE form of new introducing carrying TA, simultaneously TA group index under the indication.Concrete LCID is any one in the reserved value 01011 to 11010.

In this class MAC CE form, concrete MAC CE can adopt the concrete form such as Fig. 3 a (1), Fig. 3 a (2) or Fig. 3 a (3).

Shown in Fig. 3 a (1), MAC CE carries that the mode of TA group information is under TA and its: utilize the subelement that is made of per two bytes to carry absolute TA and the group of the TA under it information in the random access procedure of UE in MAC CE; And first bit of each subelement is set to extension field, also comprises next subelement represent this subelement when the set of extension field bit after; Utilize that all the other bits except the extension field bit carry absolute TA and the group of the TA under it information in the first byte of each subelement.

Shown in Fig. 3 a (2), the mode that MAC CE carries TA and TA organizes information under it is: preset 7 bits of the first byte among the MAC CE and the one-to-one relationship of all TA group; In the first byte of MACCE, according to predefined corresponding relation, bit set that will be corresponding with TA group under TA corresponding to each random access procedure; Comprise N subelement after the first byte, each subelement comprises two bytes, is used for carrying successively each TA that the first byte is set and organizes corresponding absolute TA; Wherein, the TA number of N for carrying among this MAC CE.

Shown in Fig. 3 a (3), the mode that MAC CE carries TA and TA organizes information under it is: preset 7 bits of the first byte among the MAC CE and the one-to-one relationship of all TA group; In the first byte of MAC CE, according to predefined corresponding relation, bit set that will be corresponding with TA group under TA corresponding to each random access procedure; After the first byte, carry successively absolute TA corresponding to each TA group that is set in the first byte.Can not byte-aligned if arrange in this form after the TA information, then guarantee its byte-aligned with filling bit.

Consider that LCID's is rare, in Equations of The Second Kind MAC CE form, utilize existing LCID corresponding to TAC MAC CE, MAC CE form of new definition carries absolute TA value, the affiliated TA group index of simultaneously indication, the 1st bit in the form is set to 1, with distinguish LCID corresponding be MACCE form in this invention.Concrete Fig. 3 b is MAC head corresponding to Equations of The Second Kind MAC CE form.Wherein, the LCID value is 11101.

In this class MAC CE form, concrete MAC CE can adopt the concrete form such as Fig. 3 b (1), Fig. 3 b (2) or Fig. 3 b (3).

Shown in Fig. 3 b (1), MAC CE carries that the mode of TA group information is under TA and its: utilize the subelement that is made of per two bytes to carry absolute TA and the group of the TA under it information in the random access procedure of UE in MAC CE; And first bit of each subelement is set to 1, the second bit and is set to extension field, also comprises next subelement represent this subelement when the set of extension field bit after; Utilize all the other bits except the first bit and extension field bit in each subelement to carry absolute TA and the group of the TA under it information.

Shown in Fig. 3 b (2), the mode that MAC CE carries TA and TA organizes information under it is: preset the 2-8 bit of the first byte among the MAC CE and the one-to-one relationship of all TA group; In the first byte of MAC CE, the first bit is set to 1, and being used to indicate what carry is absolute TA; According to predefined corresponding relation, bit set that will be corresponding with TA group under TA corresponding to described each random access procedure; Comprise N subelement after the first byte, each subelement comprises two bytes, is used for carrying successively each TA that the first byte is set and organizes corresponding absolute TA; Wherein, the TA number of N for carrying among this MAC CE.

Shown in Fig. 3 b (3), MAC CE carries that the mode of TA group information is under TA and its: in the first byte of MAC CE, the first bit is set to 1, and being used to indicate what carry is absolute TA; According to predefined corresponding relation, bit set that will be corresponding with TA group under TA corresponding to each random access procedure; After the first byte, carry successively absolute TA corresponding to each TA group that is set in the first byte.Can not byte-aligned if arrange in this form after the TA information, then guarantee its byte-aligned with filling bit.

In the 3rd class MAC CE form, identical with Equations of The Second Kind, utilize existing LCID corresponding to TAC MAC CE, newly define a MAC CE form and carry absolute TA value; Distinguish with Equations of The Second Kind, the reserved bit in the MAC head redefines and is T, and is set to 1.Concrete MAC head is shown in Fig. 3 c and Fig. 3 d.

The MAC CE form of the above-mentioned several new definition that provide for the present embodiment is used for carrying absolute TA and affiliated TA group information thereof.

The message that is used for carrying absolute TA and affiliated TA group information thereof in the present embodiment can also be the RRC signaling, specifically can self-defined new RRC signaling or use the RRC reconfiguration message.Concrete bearing mode can be set according to actual needs, belongs to those skilled in the art's common technology means, just repeats no more here.

The UE of the parallel PRACH transmission of several supports that provide among the above-mentioned the present invention of being obtains the method for TA information.By the way, UE can accurately distinguish TA value corresponding to different TA groups, thereby can guarantee the realization that many TA use.

The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims

1. support the UE of parallel PRACH transmission to obtain the method for Timing Advance for one kind, it is characterized in that, the method comprises:

2. method according to claim 1, it is characterized in that, describedly comprise for the mutually different RA-RNTI of each parallel PRACH transmission configuration of UE: be each parallel PRACH transmission configuration PRACH resource of UE, and guarantee different according to each RA-RNTI of described PRACH Resource Calculation.

3. support the UE of parallel PRACH transmission to obtain the method for Timing Advance for one kind, it is characterized in that, the method comprises:

4. method according to claim 3 is characterized in that, describedly carries in the RAR of each random access procedure message that the TA group information under the TA comprises in this RAR message:

5. method according to claim 4 is characterized in that, utilizes all the other bits that increase byte newly to carry described TA group information to be:

6. method according to claim 3 is characterized in that, describedly carries in the RAR of each random access procedure message that the TA group information under the TA comprises in this RAR message:

To add the above identical MAC head before the MAC RAR after merging.

7. method according to claim 3 is characterized in that, describedly carries in the RAR of each random access procedure message that the TA group information under the TA comprises in this RAR message:

To add the above identical MAC head before the MAC RAR after merging.

8. arbitrary described method in 7 according to claim 3 is characterized in that, the interim C-RNTI field in each described RAR message is set to the C-RNTI that distributed for described UE.

9. support the UE of parallel PRACH transmission to obtain the method for Timing Advance for one kind, it is characterized in that, the method comprises:

10. method according to claim 9 is characterized in that, described the message of TA group information is under TA and its: RAR message be used to carrying.

11. method according to claim 10 is characterized in that, the mode that described RAR message is carried TA and its described TA group information is:

12. method according to claim 11 is characterized in that, utilizes all the other bits that increase byte newly to carry described TA group information to be:

13. method according to claim 10 is characterized in that, the mode that described RAR message is carried TA and TA organizes information under it is:

To add the above identical MAC head before the MAC RAR after merging.

14. method according to claim 10 is characterized in that, the mode that described RAR message is carried TA and its described TA group information is:

To add the above identical MAC head before the MAC RAR after merging.

15. method according to claim 9 is characterized in that, described the message of TA group information is under TA and its: self-defining MAC control information unit be used to carrying; Wherein, the LCID in the corresponding MAC head of described MAC CE is that the binary code of reservation logic channel logo is any one value in 01011 to 11010 value, is used to indicate described MAC CE for carrying TA and TA group information under it.

16. method according to claim 9 is characterized in that, described the message of TA group information is under TA and its: self-defining MAC CE be used to carrying; Wherein, in the corresponding MAC head of described MAC CE, the first bit or the second bit are set to 1, be used to indicate this MAC CE and be used for carrying absolute TA and its affiliated TA group information, and LCID is set to LCID corresponding to TAC MAC CE.

17. according to claim 15 or 16 described methods, it is characterized in that, described MAC CE carry TA and under it mode of TA group information be:

18. according to claim 15 or 16 described methods, it is characterized in that, preset 7 bits of the first byte among the described MACCE and the one-to-one relationship of all TA group;

19. according to claim 15 or 16 described methods, it is characterized in that, preset 7 bits of the first byte among the described MACCE and the one-to-one relationship of all TA group;

20. method according to claim 9 is characterized in that, described the message of TA group information is under TA and its: self-defining MAC CE be used to carrying; Wherein, the LCID in the corresponding MAC head of described MAC CE is LCID corresponding to TAC MAC CE.

21. method according to claim 20 is characterized in that, the mode that described MAC CE carries TA and TA organizes information under it is:

22. method according to claim 20 is characterized in that, presets the 2-8 bit of the first byte among the described MAC CE and the one-to-one relationship of all TA group;

23. method according to claim 20 is characterized in that, presets the 2-8 bit of the first byte among the described MAC CE and the one-to-one relationship of all TA group;

24. method according to claim 9 is characterized in that, described the message of TA group information is under TA and its: RRC reconfiguration message or self-defined RRC message be used to carrying.