CN102158948B

CN102158948B - Method for obtaining up time advance in carrier aggregation

Info

Publication number: CN102158948B
Application number: CN201110038988.7A
Authority: CN
Inventors: 高伟东; 潘瑜; 林佩
Original assignee: Potevio Institute of Technology Co Ltd
Current assignee: Potevio Institute of Technology Co Ltd
Priority date: 2011-02-16
Filing date: 2011-02-16
Publication date: 2014-01-15
Anticipated expiration: 2031-02-16
Also published as: WO2012109937A1; CN102158948A

Abstract

The invention discloses a method for obtaining up time advance in carrier aggregation. A plurality of up CC are divided into a plurality of groups by eNB; the quantity of up CC in each group is at least one; grouping information and marks of groups of all the up CC are informed to UE; eNB configures different TA values for all the groups; each group of UE respectively obtains TA value corresponding to the group through a random access process; and each up CC group in the group takes the TA value corresponding to the group as a TA value corresponding to each up CC group. The method can ensure that one UE obtains a plurality of TA values.

Description

The method of obtaining up time advance in carrier aggregation

Technical field

The present invention relates to field of wireless communication, particularly a kind of method of obtaining up time advance in carrier aggregation.

Background technology

In order to meet the demand of IMT-Advanced, 3GPP has carried out the research of LTE-Advanced project, the i.e. evolution system of LTE.The key technology of LTE-Advanced system comprises: many antennas strengthen (Enhanced MIMO) technology, carrier aggregation (Carrier Aggregation, CA) technology, relaying (Relaying technology) and coordinated multipoint transmission (Coordinated Multi-point, CoMP) technology etc.Wherein, carrier aggregation technology is to improve the direct method of message transmission rate, carrier aggregation refer to the data of subscriber equipment (UE) can be on a plurality of member carriers (Component Carrier, CC) transmission simultaneously, be equivalent to increase user's transmission bandwidth.In LTE Rel-10, each CC should backward compatibility LTE Rel-8/9, and the bandwidth of each CC is bandwidth (for example, the 1.4MHz defining in LTE Rel-8/9,, 3MHz,, 5MHz,, 10MHz,, 15MHz, or 20MHz), and the UE of Rel-8/9 also can access single CC.The CC that user of 3GPP regulation can use mostly simultaneously is most 5, and the maximum transmission bandwidth of unique user can reach 100MHz in theory like this, and this will greatly improve the peak rate of user data transmission.

According to the residing frequency range of uplink and downlink member carrier, carrier aggregation can be divided into intra-band carrier aggregation and inter-band carrier aggregation.Intra-band carrier aggregation refers to that a plurality of CC that condense together belong to same frequency range, and inter-band carrier aggregation refers to that a plurality of CC that condense together are in different frequency ranges.In LTE Rel-10, for FDD system, down direction is supported intra-band carrier aggregation and inter-band carrier aggregation, and the up intra-band carrier aggregation of only supporting.For TDD system, descending and up direction is all only supported intra-band carrier aggregation.

CC represents a up-link carrier or a descending carrier, a up CC and a descending CC are associated and are just formed Liao Yige community (Cell) by certain corresponding relation, so carrier aggregation is also referred to as community polymerization (Cell Aggregation).In order to support the asymmetry ，Yi Ge community of uplink and downlink business, also can only have descending CC and there is no up CC.

For the ease of member carrier is managed, 3GPP has introduced again main member carrier (Primary CC, and stipulate that each UE is up to a up PCC and a descending PCC PCC) and the concept of auxiliary member carrier (Secondary CC, SCC).The effect of descending PCC comprise set up that radio resource control (Radio Resource Control, RRC) signaling connects, Non-Access Stratum (Non-Access Stratum, NAS) mobility and as the input of security parameters etc.; Up PCC is for sending the control information of physical layer.Descending PCC and up PCC are associated and have formed main plot (Primary Cell, PCell), and descending SCC forms Liao Fu community (Secondary Cell, SCell) together with the up SCC being associated.

Fig. 1 is the schematic diagram of intra-band carrier aggregation, and Fig. 2 is the schematic diagram of inter-band carrier aggregation.Wherein, with downward arrow, represent descending CC, with arrow upwards, represent up CC, with the descending PCC of slash shadow representation, with the up PCC of square shadow representation.As shown in Figure 1, three descending CC belong to same frequency range: frequency range A, and two up CC belong to same frequency range: frequency range A.As shown in Figure 2, three descending CC belong to different frequency range: frequency range A and frequency range B, two up CC belong to same frequency range: frequency range A.

Fig. 3 is 5 kinds of scene schematic diagrames of carrier aggregation.As shown in Figure 3, carrier aggregation has 5 kinds of deployment scenario.The carrier aggregation of 2 CC (CC1 and CC2) of take is below introduced respectively various scenes as example, and wherein, 2 CC can be up CC, can be also all descending CC, also can one be up CC, another is descending CC.In scene 1, CC1 and CC2 belong to identical base station (eNB), and the coverage of CC1 and CC2 is basic identical; The typical case of scene 1 is intra-band carrier aggregation.In scene 2, CC1 and CC2 belong to identical eNB, but the coverage of CC1 and CC2 is different; The coverage of CC1 is large, is used to provide covering, and the coverage of CC2 is little, is used for improving the capacity of eNB center coverage.In scene 3, CC1 and CC2 belong to identical eNB, but the antenna direction of two CC is inconsistent: CC1 is used to provide covering, and CC2 is used for improving the capacity of CC1 cell edge.In scene 4, CC1 belongs to eNB, and CC2 belongs to the RF remote (Radio Remote Header, RRH) of eNB, and RRH is connected by optical fiber with eNB; CC1 is used to provide covering, and CC2 is used to provide the capacity of hot zones.In scene 5, CC1 and CC2 belong to identical eNB, and the signal in CC2 frequency range can be amplified in the repeater (repeater) of disposing in this eNB coverage, thereby has expanded the coverage of CC2.

In the coverage of same eNB, the distance between each UE and eNB may be different, and the propagation delay time of upstream data arrival eNB is also just different.In order to eliminate the interference between user, the upstream data of a plurality of UE must arrive eNB simultaneously.Uplink timing advance (Timing Advance, TA) be exactly to propose in order to realize this object, TA has made up the radio propagation time delay between UE and eNB, the size of TA has reflected that the distance between UE and eNB is far and near, the TA value of the UE far away apart from eNB is larger, the TA value of the UE near apart from eNB is smaller, thereby guarantees that data arrive user simultaneously.

In Rel-10, for 5 kinds of scenes of carrier aggregation, no matter be FDD system or TDD system, up direction is all only supported intra-band carrier aggregation, a UE only has unique TA value, on a plurality of CC, sends data simultaneously.Wherein, the method that UE obtains TA is two kinds: first kind of way is in random access procedure, eNB is by accidental access response (Random Access Response, RAR) the TA value that message informing UE need to be used, this TA value is an absolute value, and length is 11 bits, in fact, UE utilizes this 11 bit to convert, and draws the actual TA value that microsecond (us) is unit of take; The second way is after UE uplink synchronous situation variation, eNB controls control unit (MAC Control Element) notice UE by media interviews TA value is upgraded, the TA value that MAC Control Element carries is a relative value, the length of TA value is 6 bits, the reference data of TA relative value is the old TA value of previously using, and the TA value sum that old TA value and MAC Control Element carry is the TA value after upgrading.Fig. 4 is the schematic diagram of MAC Control Element in prior art, and as shown in Figure 4, the length of MAC Control Element is 1 byte (byte), and first 2 of MAC Control Element is reserved bit " R ", and remaining 6 is TA value.In addition, before MAC Control Element, also comprise Logic Channel Identifier (LCID) (scheming not shown), it for identifying the information type of MAC Control Element, shows that the information in MAC Control Element is a TA as a part of head (header).UE can identify according to LCID the information that in MAC Control Element, each bit represents.

It should be noted that, above-mentioned two kinds of methods are applicable to respectively different scenes, for example, UE obtains initial TA value by accidental access response, and under RRC_CONNECTED state, because UE moves while causing TA value to change, eNB can be by the new TA value of MAC CE notice UE.

But if need support inter-band carrier aggregation at up direction, above-mentioned scene 4 and 5 all requires UE must support a plurality of TA values, below concrete reason is introduced.

Fig. 5 is the schematic diagram of carrier aggregation scene 4, and as shown in Figure 5, in scene 5, eNB connects together with RF remote (RRH) by fiber optic stretch.UE sends to the data of eNB and RRH and at eNB place, processes uniformly.Between eNB and RRH, be wired connection, the propagation delay time between the two can be ignored.The data that UE sends on CC1 directly send to eNB, and the data that send on CC2 are transmitted to eNB by optical fiber after being received by RRH.Because UE is different apart from the distance of eNB and RRH, in order to guarantee that the data on different frequency synchronously arrive eNB, UE is the data transmitting time transmitting time of data on CC1 in advance on CC2, and no matter whether CC1 and CC2 be in same frequency range, and CC1 and CC2 need corresponding different TA values.

Fig. 6 is the schematic diagram of carrier aggregation scene 5, as shown in Figure 6, in scene 5, has disposed repeater (repeater), for extended coverage range in the coverage of eNB.The frequency in some band limits can only be amplified in repeater.In up (UL) direction, suppose that UE has configured carrier wave CC1 and two carrier waves of CC2, and CC1 and CC2 belong to different frequency ranges, now up direction is equivalent to inter-band carrier aggregation.The coverage of CC1 is larger, and the data that UE sends on CC1 can directly send to eNB; The coverage of CC2 is less, and the data that UE sends on CC2 only have after processing is amplified in repeater could arrive eNB, so the data on CC2 have experienced extra processing delay.That is to say, UE sends data on CC1 and CC2 simultaneously, but the moment of arrival eNB is inconsistent.So in order to guarantee that the data on different frequency synchronously arrive eNB, CC1 and CC2 must the different TA values of correspondence.

And in following wireless communication system, various new business can continue to bring out, the speed of uplink service also can propose higher requirement than Rel-10, but on up direction, find continuously the frequency spectrum of large section to support ever-increasing uplink transmission rate demand not a duck soup, therefore, in order to make full use of existing frequency spectrum resource on up direction, need on up direction, apply inter-band carrier aggregation technology.

To sum up, in the prior art, a UE only obtains a TA value, at up direction, cannot support carrier aggregation scene 4 and 5, therefore, if following, on up direction, apply inter-band carrier aggregation technology, and enable to be applied in scene 4 and 5, UE of inevitable requirement can obtain a plurality of TA values, yet prior art does not also propose corresponding solution.

Summary of the invention

In view of this, the invention provides a kind of method of obtaining up time advance in carrier aggregation, can make a UE obtain a plurality of TA values.

For achieving the above object, technical scheme of the present invention is achieved in that

A method for obtaining up time advance in carrier aggregation in advance for user equipment (UE) configures a plurality of uplink member carrier CC, is used a plurality of up CC configuring to carry out transmitting uplink data for UE simultaneously, and the method comprises:

A, base station eNB are divided into a plurality of groups by a plurality of up CC, and the quantity of the up CC that each group is included is at least one, and the sign of group under grouping information and each up CC is informed to UE;

The uplink timing advance TA value that B, eNB are different for each group configures, each group of UE obtains in TAZhi，Gai group corresponding to this group TA value corresponding to each up CCJiang group as the TA value of self correspondence by random access procedure respectively.

The method further comprises:

Step C, eNB send TA renewal value corresponding to each group to UE, for each group, the TA renewal value TA value corresponding with step B Zhong Gai group corresponding to UEJiang Gai group is added, as TA value after renewal corresponding to each up CCJiang group in TAZhi，Gai group after renewal corresponding to this group as the renewal of self correspondence after TA value.

The method that described in steps A, a plurality of up CC is divided into a plurality of groups comprises:

The up CC that belongs to similar frequency bands is divided into same a small group; Or,

By belonging to different frequency range, but being less than the up CC of the first thresholding, the absolute value of frequency interval is divided into same a small group, by belonging to similar frequency bands, but being greater than the up CC of the second thresholding, the absolute value of frequency interval is divided into different groups.

Described in steps A, the sign of group under grouping information and each up CC is informed to the method for UE comprises: eNB sends radio resource control RRC to UE and connects reconfiguration message, and this message is carried the sign of grouping information and the affiliated group of each up CC.

The method that sends TA renewal value corresponding to each group to UE described in step C is: eNB configures the media interviews MAC Control Element of any one descending CC, MAC Control Element carries TA renewal value corresponding to all groups, and the MAC Control Element of the described TA of carrying renewal value is sent to UE.

In described MAC Control Element, with the bitmap of first byte, identify TA renewal value corresponding to a plurality of groups, wherein, if the TA renewal value of carrying is N, the byte number of MAC Control Element is N+1, wherein, first byte represents that the TA renewal of carrying is worth corresponding group, all the other N byte represents according to the order of group the TA renewal value that each group is corresponding respectively successively, in a described N byte, the front two of each byte is reserved bit, TA renewal value corresponding to residue Liu Weiweigai group.

If the TA renewal value that MAC Control Element carries is N, the byte number of MAC Control Element is N, and the front two of each byte, for representing the sign of this group, remains TA renewal value corresponding to Liu Weiweigai group.

The method that sends TA renewal value corresponding to each group to UE described in step C is: eNB configures a plurality of media interviews MAC Control Element of any one descending CC, each MAC Control Element carries TA renewal value corresponding to Yi Ge group, and each MAC Control Element of the described TA of carrying renewal value is sent to UE.

The method that sends TA renewal value corresponding to each group to UE described in step C is: a plurality of MAC Control Element of a plurality of descending CC of eNB configuration, each MAC Control Element carries TA renewal value corresponding to Yi Ge group, and each MAC Control Element of the described TA of carrying renewal value is sent to UE.

If the TA renewal value that MAC Control Element carries is N, the quantity summation of MAC Control Element is N, and wherein, each MAC Control Element is a byte, the front two of each byte, for representing the sign of this group, remains TA renewal value corresponding to Liu Weiweigai group.

According to technical scheme provided by the present invention, eNB is divided into a plurality of groups by a plurality of up CC, the quantity of the up CC that each group is included is at least one, and the sign of group under grouping information and each up CC is informed to UE, the TA value that eNB is different for each group configures, each group of UE obtains TA value corresponding to this group by random access procedure respectively, in this group, TA value corresponding to each up CCJiang group is as the TA value of self correspondence, visible, method provided by the present invention can make a UE obtain a plurality of TA values.

In addition, for the present invention still continues to use the method that in prior art, initial TA value is transmitted, and the transmission method of TA renewal value, only when carrying out initial TA value transmission, consideration as how group are that unit passes to UE by a plurality of TA values, and when carrying out the transmission of TA renewal value, consideration changes to realize the transmission of a plurality of TA values to the form of MAC Control Element, therefore, the solution of the present invention has guaranteed the backwards compatibility to LTE version.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of intra-band carrier aggregation.

Fig. 2 is the schematic diagram of inter-band carrier aggregation.

Fig. 3 is 5 kinds of scene schematic diagrames of carrier aggregation.

Fig. 4 is the schematic diagram of MAC Control Element in prior art.

Fig. 5 is the schematic diagram of carrier aggregation scene 4.

Fig. 6 is the schematic diagram of carrier aggregation scene 5.

Fig. 7 is the flow chart of the method for a kind of obtaining up time advance in carrier aggregation provided by the present invention.

Fig. 8 is for adopting bitmap to represent the schematic diagram of the embodiment of two TA renewal values.

Fig. 9 is for adopting reserved bit " R " to represent the schematic diagram of the embodiment of two TA renewal values.

Figure 10 is the schematic diagram of the embodiment of two TA renewal values two MAC Control Element being included in respectively same descending CC.

Figure 11 is the schematic diagram of the embodiment of two TA renewal values two MAC Control Element being included in respectively two descending CC.

Embodiment

For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, scheme of the present invention is described in further detail.

Fig. 7 is the flow chart of the method for a kind of obtaining up time advance in carrier aggregation provided by the present invention.The present invention can be applied in the situation of up inter-band carrier aggregation, can support carrier aggregation scene 4 and 5 especially, before step 101, for a plurality of up CC of UE configuration, for UE, use a plurality of up CC configuring to carry out transmitting uplink data in advance simultaneously.According to the regulation of current agreement, for the quantity of the up CC of UE configuration mostly is 5 most.

In addition, easy in order to describe, unless stated otherwise, following CC all refers to up CC.

Below, method shown in Fig. 7 is described in detail, as shown in Figure 7, the method comprises the following steps:

Step 101, eNB is divided into a plurality of groups by a plurality of up CC, and the quantity of the up CC that each group is included is at least one, and the sign of group under grouping information and each up CC is informed to UE.

By the object of CC grouping, be in order to reduce the complexity of random access, the CC in same group has identical TA value, and UE only need to initiate a random access procedure can obtain interior TA value corresponding to all CC of this CC group.

In this step, the method for grouping is more flexible, to the not concrete restriction of the quantity of the method for grouping and Suo Fen group.At this, the two kinds of group technologies of only take describe as example:

The first, the CC that belongs to similar frequency bands is divided into same a small group.

For example, suppose that UE supports 5 CC:CC1, CC2, CC3, CC4, CC5, CC 1 and CC2 belong to frequency range A, CC3 and CC4 belong to frequency range B, and CC5 belongs to frequency range C, can divide CC1 and CC2 into Dao 1 group, divide CC3 and CC4 into Dao 2 groups, CC5 is divided into the 3rd group.

Because the CC in same frequency range has similar transmission characteristic, the CC of same frequency range can be divided into is one group, and the CC that therefore can be same frequency range configures identical TA value.Up of Rel-10 supports intra-band carrier aggregation, and UE has unique TA value, is exactly this reason.

The second, by belonging to different frequency range, but being less than the CC of the first thresholding, the absolute value of frequency interval is divided into same a small group, by belonging to similar frequency bands, but being greater than the CC of the second thresholding, the absolute value of frequency interval is divided into different groups.

That is to say, if although several CC belong to different frequency range, the frequency of these CC is very approaching, also these CC can be divided into same group; Otherwise although if several CC belong to similar frequency bands, the frequency distance of these CC is very large, also these CC can be divided into not on the same group.

For example, suppose that UE supports 5 CC:CC1, CC2, CC3, CC4, CC5, CC1 and CC2 belong to frequency range A, CC3 and CC4 belong to frequency range B, CC5 belongs to frequency range C, if the absolute value of the difference of the frequency of CC2 and CC3 is less than the first thresholding, can divide CC2 and CC3 into Dao 1 group, if the absolute value of the difference of the frequency of CC4 and CC5 is less than the first thresholding, can divide CC4 and CC5 into Dao 2 groups, if the absolute value of the difference of the frequency of CC1 and CC2 is greater than the second thresholding, CC1 is not divided to the 1st group, CC1 can be divided into separately to the 3rd group.

CC in a plurality of different frequency ranges is divided in same CC group and can reduces the complexity of random access, and the CC in same frequency range is divided into the accuracy that can improve uplink synchronous in different CC groups.

In this step, eNB informs UE by grouping information, grouping information is used for representing which group which CC has been divided to, simultaneously, eNB also informs UE by the sign of group under each CC, the form of the sign of group can be for arbitrary forms such as numbering, index, only for different groups are distinguished.The concrete grammar of informing is: eNB sends RRC to UE and connects reconfiguration message, and this message is carried the sign of grouping information and the affiliated group of each up CC.

Particularly, when eNB is connected reconfiguration message (RRC Connection Reconfiguration) DuiUE Serving cell and is configured/reshuffles by RRC, the parameter configuration of the parameter configuration that RRC parameter configuration comprises cell-level and UE level.The parameter configuration of so-called cell-level, refers to that the parameter configuration of this part is all suitable for all UE in same eNB; And the parameter configuration of UE level refers to that the parameter configuration of this part is specially adapted for current UE.ENB, can be included in the parameter configuration of cell-level in the grouping information and group's sign about CC at notice UE, also can be included in the parameter configuration of UE level.If be included in the parameter configuration of cell-level, CC packet mode is all identical concerning all UE so.If the grouping information of CC is included in the parameter configuration of UE level, CC packet mode can be different concerning different UEs.

Step 102, the TA value that eNB is different for each group configures, each group of UE obtains in TAZhi，Gai group corresponding to this group TA value corresponding to each up CCJiang group as the TA value of self correspondence by random access procedure respectively.

In this step, be specially which group configures great TA value according to actual conditions and definite, for example, in conjunction with scene 4, for the UE in CC1 and CC2 superimposed coverage area, TA value corresponding to group is large under CC1, and TA value corresponding to the affiliated group of CC2 is less.The method of concrete configuration can be with reference to configure the principle of different TA values in prior art for different UEs.

UE will obtain initial TA value (11 bit), must carry out random access procedure, and in fact, UE utilizes this 11 bit to convert, and draws the actual TA value that microsecond (us) is unit of take, and this is identical with prior art.This step difference with the prior art is: the acquisition of each TA value needs corresponding random access procedure to complete, and supposes to have 3 groups, must obtain respectively TA value corresponding to each group by three random access procedures.The random access procedure of each group is identical with prior art, and it will not go into details herein.

Illustrate, suppose that CC1 and CC2 divide Dao 1 group into, CC3 and CC4 divide Dao 2 groups into, CC5 is divided into the 3rd group, Ze 1 group obtains the 1st TA_1 corresponding to group by random access procedure, the 2nd group obtains TA_2 ， 3 groups corresponding to the 2nd group by random access procedure and obtains the 3rd TA_3 corresponding to community by random access procedure.

Each group for example obtains TA value corresponding to each CCJiang group in TAZhi Hou，Ze Gai group, as the TA value of self correspondence,, the TA value that CC1 is corresponding is TA_1, and the TA value that CC2 is corresponding is TA_1, and the TA value that CC3 is corresponding is TA_2, the TA value that CC4 is corresponding is TA_2, and the TA value that CC5 is corresponding is TA_3.

Further, similar with prior art, if because movement or the other reasons of UE makes UE uplink synchronous situation variation, eNB also notifies UE to upgrade TA value by MAC Control Element, unlike the prior art, in the prior art, MAC Control Element only need carry a TA value, and in the present invention, need upgrade the TA value of different CC, therefore the content that need to carry MAC Control Element and form etc. are changed, and below in conjunction with step 103, describe in detail.

Step 103, eNB sends TA renewal value corresponding to each group to UE, for each group, the TA renewal value TA value corresponding with step 102Zhong Gai group corresponding to UEJiang Gai group is added, as TA value after renewal corresponding to each up CCJiang group in TAZhi，Gai group after renewal corresponding to this group as the renewal of self correspondence after TA value.

In this step, eNB sends TA renewal value corresponding to group to UE can following several mode:

First method, eNB configures the MAC Control Element of any one descending CC, and MAC Control Element carries TA renewal value corresponding to all groups, and the MAC Control Element of the described TA of carrying renewal value is sent to UE.

In first method, if a plurality of TA renewal values send in the same MAC Control Element of same descending CC, need to introduce new MAC Control Element form, because the TA value MAC Control Element in Rel-10 and in the past protocol version is regular length, length is 1 byte (byte), cannot meet the requirement of a plurality of TA value variable-length MAC Control Element.

A plurality of TA renewal values are included in same MAC Control Element and send, and also have different implementation methods, below only with two example explanations.

For example, a kind of method is in this MAC Control Element, with the bitmap (Bitmap) of a byte, identify TA renewal value (first byte is called bitmap) corresponding to a plurality of groups, for example, if the TA renewal value of carrying is N, the byte number of MAC Control Element is N+1, wherein, first byte represents that the TA renewal of carrying is worth corresponding group, all the other N byte represents according to the order of group the TA renewal value that each group is corresponding respectively successively, in this N byte, the front two of each byte is reserved bit " R ", TA renewal value corresponding to residue Liu Weiweigai group.Fig. 8 is for adopting bitmap to represent the schematic diagram of the embodiment of two TA renewal values, as shown in Figure 8, bitmap comprises three row, every a line is 8 bits, it is byte of each behavior, the first byte representation TA renewal is worth corresponding group, if the TA renewal value that the Shi carrying 1 He of group 2 groups are corresponding, the first byte is 00000011, by that analogy, if the Shi carrying 1 group, the TA renewal value that the 2nd He of group 3 groups are corresponding, the first byte is 00000111, if the TA renewal value that the Shi carrying 2 He of group 3 groups are corresponding, the first byte is 00000110.At this, Fig. 8 only take that to carry the 1st He of group 2 groups be example.Front two in the second byte is reserved bit " R ", remain six TA renewal value TA_1 that Wei 1 group is corresponding, front two in the 3rd byte is reserved bit " R ", remain six TA renewal value TA_2 that Wei 2 groups are corresponding, visible, the form of the second byte and the 3rd byte is identical with the form of MAC Control Element in prior art.It should be noted that, the form of above-mentioned bitmap, only for illustrating, is not intended to limit and only has above-mentioned a kind of execution mode.

For example, another kind method is in MAC Control Element, utilize reserved bit " R " to represent the TA renewal value that this group is corresponding, for example, if the TA renewal value of carrying is N, the byte number of MAC Control Element is N, and the front two of each byte, for representing the sign of this group, remains TA renewal value corresponding to Liu Weiweigai group.Fig. 9 is for adopting reserved bit " R " to represent the schematic diagram of the embodiment of two TA renewal values, as shown in Figure 9, MAC Control Element comprises two bytes, in the first byte, front two represents the sign " 00 " of the 1st group, remains six TA renewal value TA_1 that Wei 1 group is corresponding, in the second byte, front two represents the sign " 01 " of the 2nd group, remains six TA renewal value TA_2 that Wei 2 groups are corresponding.

Due in above-mentioned first method, a plurality of TA renewal values are included in same MAC Control Element, and therefore, it is identical that a plurality of TA renewal values arrive the moment of UE.

In addition, before MAC Control Element, also comprise Logic Channel Identifier (LCID) (scheming not shown), it is as a part of head (header), for identifying the information type of above-mentioned MAC Control Element, show that the information in MAC Control Element is a plurality of TA renewal values, UE can identify according to LCID the information that in MAC Control Element, each bit represents.

Second method, eNB configures a plurality of MAC Control Element of any one descending CC, and each MAC Control Element carries TA renewal value corresponding to Yi Ge group, and each MAC Control Element of the described TA of carrying renewal value is sent to UE.

A plurality of TA renewal values also can send in the different MAC Control Element of same descending CC, a plurality of MAC Control Element of a descending CC of eNB configuration, the quantity summation of MAC Control Element can equal the number summation of the TA renewal value that need to carry, and each MAC Control Element carries TA renewal value corresponding to Yi Ge group.

For example, if the TA renewal value of carrying is N, the quantity summation of MAC Control Element is N, and wherein, each MAC Control Element is a byte, the sign of the front two Wei Gai group of each byte, TA renewal value corresponding to residue Liu Weiweigai group.Figure 10 is the schematic diagram of the embodiment of two TA renewal values two MAC Control Element being included in respectively same descending CC, as shown in figure 10, MAC Control Element 1 is a byte, front two represents the sign " 00 " of the 1st group, remain six TA renewal value TA_1 that Wei 1 group is corresponding, MAC Control Element 2 is a byte, and front two represents the sign " 01 " of the 2nd group, remains six TA renewal value TA_2 that Wei 2 groups are corresponding.

Due in above-mentioned second method, a plurality of TA renewal values are included in different MAC Control Element, and therefore, the moment of a plurality of TA renewal values arrival UE may be not identical.

In addition, before each MAC Control Element, also comprise Logic Channel Identifier (LCID) (scheming not shown), it is as a part of head (header), for identifying the information type of above-mentioned MAC Control Element, UE can identify according to LCID the information that in MAC Control Element, each bit represents.

The third method, a plurality of MAC Control Element of a plurality of descending CC of eNB configuration, each MAC Control Element carries TA renewal value corresponding to Yi Ge group, and each MAC Control Element of the described TA of carrying renewal value is sent to UE.

A plurality of TA renewal values also can send in the different MAC Control Element of the descending CC of difference, a plurality of MAC Control Element of a plurality of descending CC of eNB configuration, the quantity summation of MAC Control Element can equal the number summation of the TA renewal value that need to carry, and each MAC Control Element carries TA renewal value corresponding to Yi Ge group.

For example, if the TA renewal value of carrying is N, the quantity summation of MAC Control Element is N, and wherein, each MAC Control Element is a byte, and the front two of each byte, for representing the sign of this group, remains TA renewal value corresponding to Liu Weiweigai group.Figure 11 is the schematic diagram of the embodiment of two TA renewal values two MAC Control Element being included in respectively two descending CC.As shown in figure 11, the MAC Control Element 1 of eNB configuration CC1, MAC Control Element 1 is a byte, front two represents the sign " 00 " of the 1st group, remains six TA renewal value TA_1 that Wei 1 group is corresponding.The MAC Control Element 2 of eNB configuration CC2, MAC Control Element 2 is a byte, front two represents the sign " 01 " of the 2nd group, remains six TA renewal value TA_2 that Wei 2 groups are corresponding.

Due in above-mentioned the third method, a plurality of TA renewal values are included in the different MAC Control Element of different descending CC, and therefore, the moment of a plurality of TA renewal values arrival UE may be not identical.

So far, this flow process finishes.

To sum up, in the present invention, eNB is divided into a plurality of groups by a plurality of up CC, the quantity of the up CC that each group is included is at least one, and the sign of group under grouping information and each up CC is informed to UE, the TA value that eNB is different for each group configures, each group of UE obtains TA value corresponding to this group by random access procedure respectively, in this group, TA value corresponding to each up CCJiang group is as the TA value of self correspondence, visible, method provided by the present invention can make a UE obtain a plurality of TA values.

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

Claims

1. the method for an obtaining up time advance in carrier aggregation, it is characterized in that, the method comprises: base station eNB is divided into a plurality of groups by a plurality of up CC, eNB sends radio resource control RRC to UE and connects reconfiguration message, and this message is carried the sign of grouping information and the affiliated group of each up CC;

ENB is configuration media interviews MAC Control Element one of in the following way, and described MAC Control Element carries TA renewal value corresponding to each group; And the MAC Control Element of the described TA of carrying renewal value is sent to UE;

ENB configures the MAC Control Element of any one descending CC, and MAC Control Element carries TA renewal value corresponding to all groups;

ENB configures a plurality of MAC Control Element of any one descending CC, and each MAC Control Element carries TA renewal value corresponding to Yi Ge group;

A plurality of MAC Control Element of a plurality of descending CC of eNB configuration, each MAC Control Element carries TA renewal value corresponding to Yi Ge group;