WO2012109937A1

WO2012109937A1 - Method for obtaining uplink timing advance in carrier aggregation

Info

Publication number: WO2012109937A1
Application number: PCT/CN2011/083401
Authority: WO
Inventors: 高伟东; 潘瑜; 林佩
Original assignee: 普天信息技术研究院有限公司
Priority date: 2011-02-16
Filing date: 2011-12-02
Publication date: 2012-08-23
Also published as: CN102158948A; CN102158948B

Abstract

Disclosed are a method and device for obtaining uplink timing advance in carrier aggregation. The method includes: User Equipment (UE) is pre-configured with a plurality of serving cells, with each serving cell including an uplink CC, so that the UE uses the plurality of configured uplink CCs to transmit uplink data simultaneously; the eNB divides the plurality of serving cells into a plurality of groups, with each group including at least one serving cell, and notifies the UE of the grouping information and the identity of the group to which each serving cell belongs, and the eNB configures different TA values for each group. The UE can obtain the TA value of each group by way of the random access process. By way of the method disclosed in the present invention, one UE can obtain a plurality of TA values.

Description

Method for obtaining uplink timing advance in carrier aggregation

Technical field

The present invention relates to the field of wireless communications, and in particular, to a method for obtaining an uplink timing advance in carrier aggregation. Background of the invention

Carrier aggregation technology is a method of increasing the data transmission rate. Carrier aggregation means that the data of the user equipment (UE) can be transmitted simultaneously on multiple component carriers (CCs), which is equivalent to extending the transmission bandwidth of the user.

The CC represents an uplink carrier or a downlink carrier. An uplink CC and a downlink CC are associated together by a certain correspondence to form a cell (Cell). Therefore, carrier aggregation is also called Cell Aggregation. According to the frequency bands of the uplink and downlink component carriers, carrier aggregation can be divided into intra-band carrier aggregation and inter-band carrier aggregation. The intra-band carrier aggregation means that multiple CCs that are aggregated belong to the same frequency band. Inter-band carrier aggregation refers to multiple CCs that are aggregated into different frequency bands. In LTE Rel-10, for the FDD system, the downlink direction supports intra-band carrier aggregation and inter-band carrier aggregation, while the uplink direction only supports intra-band carrier aggregation. For TDD systems, only intra-band carrier aggregation is supported in both the downlink and uplink directions.

FIG. 1 is a schematic diagram of intra-band carrier aggregation, and FIG. 2 is a schematic diagram of inter-band carrier aggregation. Wherein, the downward arrow indicates the downlink CC, the upward arrow indicates the uplink CC, the slash shadow indicates the downlink primary component carrier (Primary CC, PCC), and the square shading indicates the uplink PCC. As shown in Figure 1, the three downlink CCs belong to the same frequency band: Band A, and two uplink CCs belong to the same frequency band: Band A. As shown in Figure 2, the three downlink CCs belong to two different frequency bands: Band A and Band B, and the two uplink CCs belong to the same frequency band: Band A. Within the coverage of the same eNB, the distance between each UE and the eNB may be different, and the transmission delay of the uplink data to the eNB is different. In order to eliminate interference between users, uplink data of multiple UEs must arrive at the eNB at the same time. The Timing Advance (TA) is proposed to achieve this purpose. The TA compensates for the propagation delay between the UE and the eNB. The size of the TA reflects the distance between the UE and the eNB. In general, the TA value of the UE far from the eNB is larger, and the TA value of the UE that is close to the eNB is smaller, so that the uplink data of different users arrives at the eNB at the same time.

In Rel-10, whether in the FDD system or the TDD system, only the intra-band carrier aggregation is supported in the uplink direction, and one UE has a unique TA value, that is, data is simultaneously transmitted on multiple CCs. The prior art has not proposed a solution in which a UE can obtain a plurality of TA values. Summary of the invention

In view of this, the present invention provides a method for obtaining an uplink timing advance in carrier aggregation, which enables one UE to obtain multiple TA values.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A method for obtaining an uplink timing advance in carrier aggregation, where a plurality of serving cells are configured in advance for a user equipment UE, and each serving cell includes an uplink CC, so that the UE simultaneously performs uplink data transmission by using the configured multiple uplink CCs, where Methods include:

The base station eNB divides the plurality of serving cells into a plurality of groups, each group includes at least one serving cell, and notifies the UE of the group information and the identifier of each service d and the group to which the area belongs;

The eNB configures a corresponding uplink timing advance TA value for each group, and notifies the UE of the TA value. An apparatus for obtaining an uplink timing advance in carrier aggregation, where a plurality of serving cells are configured in advance for a user equipment UE, and each serving cell includes an uplink CC for use by the UE. The configured uplink cc performs uplink data transmission at the same time, and the device includes:

a grouping module, configured to divide a plurality of serving cells into a plurality of groups, each group comprising at least one serving cell, and notifying the UE of the group information and the identifier of the group to which each serving cell belongs;

A configuration module is configured to configure different uplink timing advance TA values for each group. According to the technical solution provided by the present invention, the eNB divides the multiple serving cells into a plurality of groups, each group includes at least one serving cell, and notifies the UE of the group information and the identifier of the group to which each serving cell belongs. The eNB configures corresponding TA values for each group. The UE can obtain the initial TA value corresponding to each group through a random access procedure. It can be seen that the method provided by the present invention enables one UE to obtain a plurality of TA values. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of intra-band carrier aggregation.

2 is a schematic diagram of inter-band carrier aggregation.

FIG. 3 is a schematic diagram of download wave aggregation in a radio remote scene.

Figure 4 is a schematic diagram of download wave aggregation in a repeater scenario.

FIG. 5 is a flowchart of a method for obtaining an uplink timing advance in carrier aggregation according to the present invention.

Figure 6 is a schematic diagram of an embodiment in which a bitmap is used to represent two TA update values.

Figure 7 is a schematic diagram of an embodiment in which the reserved bits "R" are used to represent two TA update values. Figure 8 is a schematic diagram of an embodiment of two MAC control units with two TA update values respectively contained in the same serving cell.

9 is a schematic diagram of an embodiment of two MAC control units with two TA update values respectively included in two serving cells. DETAILED DESCRIPTION OF THE INVENTION In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

In the future wireless communication system, various new services will continue to emerge, and the rate of uplink services will be higher than that of Rel-10, but it is necessary to find a continuous large-scale spectrum in the uplink direction to support the growing The uplink transmission rate requirement is not an easy task. Therefore, in order to make full use of the existing spectrum resources in the uplink direction, it is necessary to apply the inter-band carrier aggregation technology in the uplink direction.

However, if the inter-band carrier aggregation is to be supported in the uplink direction, the UE must support multiple TA values in the remote radio scenario and the repeater scenario.

Figure 3 is a schematic diagram of downloading wave aggregation in a radio remote scene. As shown in Figure 3, in this scenario, the eNB is connected to the radio far end (RRH) through the optical fiber. The data transmitted by the UE to the eNB and the RRH is uniformly processed at the eNB. There is a wired connection between the eNB and the RRH, and the transmission delay between the two can be ignored. The data sent by the UE on the CC1 is directly sent to the eNB, and the data sent on the CC2 is forwarded to the eNB through the optical fiber after being received by the RRH. Because the distance between the UE and the RRH is different, in order to ensure that data on different frequencies arrives at the eNB, the data of the UE on CC1 and CC2 should have different transmission times, that is, whether CC1 and CC2 are in the same frequency band, CC1 and CC2. Need to correspond to different TA values.

Figure 4 is a schematic diagram of download wave aggregation in a repeater scenario. As shown in Figure 4, in this scenario, a repeater (repeater) is deployed in the coverage of the eNB to extend the coverage. A repeater can only amplify signals on a carrier within a certain frequency range. In the uplink (UL) direction, it is assumed that the UE is configured with two carriers CC1 and CC2, and CC1 and CC2 belong to different frequency bands, and the uplink direction is equivalent to inter-band carrier aggregation. The coverage of CC1 is large, and the data sent by the UE on CC1 can be directly sent to the eNB; the coverage of CC2 is small, and the UE is The data sent on CC2 can only reach the eNB after being amplified by the repeater, so the data on CC2 experiences additional processing delay. That is, the UE simultaneously transmits data on CC1 and CC2, but the timing of arriving at the eNB is inconsistent. Therefore, in order to ensure that data on different frequencies arrive at the eNB synchronously, CC1 and CC2 must correspond to different TA values.

Therefore, the embodiment of the present invention provides a method for obtaining an uplink timing advance in carrier aggregation. The method can be applied to the uplink inter-band carrier aggregation, and particularly supports the radio remote scene and the repeater scenario. Carrier aggregation. It should be noted that the embodiments of the present invention are also applicable to other uplink inter-band carrier aggregation.

FIG. 5 is a flowchart of a method for obtaining an uplink timing advance in carrier aggregation according to the present invention. Before the step 101, a plurality of serving cells are configured in advance for the UE, and each serving cell includes an uplink CC, so that the UE performs uplink data transmission simultaneously by using the configured multiple uplink CCs. According to the current agreement, the number of serving cells configured for the UE is up to five.

Next, the method shown in FIG. 5 is described in detail. As shown in FIG. 5, the method includes the following steps:

Step 101: The eNB divides the multiple serving cells into a plurality of groups, and each group includes at least one serving cell, and notifies the UE2 of the group information and the identifier of the group to which each serving cell belongs.

The purpose of grouping the serving cells is to reduce the complexity of the random access. The serving cells in the same group have the same TA value. The UE only needs to initiate a random access procedure to obtain the TA value corresponding to all the serving cells in the group. .

In this step, the method of grouping is flexible, and there is no specific limitation on the method of grouping and the number of groups to be divided. Here, only two grouping methods are taken as an example:

First, divide CCs belonging to the same frequency band into the same group.

For example, suppose the UE is configured with 5 serving cells, and the corresponding uplink CCs are: CC1. CC2, CC3, CC4, CC5, CC1 and CC2 belong to the frequency band A, CC3 and CC4 belong to the frequency band B, and CC5 belongs to the frequency band (:, then the serving cell 1 and the serving cell 2 can be classified into the first group, and the serving cell 3 and The service cell 4 is classified into the second group, and the service cell 5 is divided into the third group.

Because the CCs in the same frequency band have similar transmission characteristics, the serving cells in which the uplink CCs belong to the same frequency band can be grouped into one group. Therefore, the serving cells whose uplink carrier frequencies belong to the same frequency band correspond to the same TA value. The Rel-10 uplink only supports intra-band carrier aggregation, and the UE has a unique TA value. This is the reason.

Second, the uplink carrier frequency belongs to different frequency bands, but the serving cell whose absolute value of the frequency interval is smaller than the first threshold is divided into the same group, and the uplink carrier frequency belongs to the same frequency band, but the absolute value of the frequency interval is greater than the second threshold. The service community is divided into different groups.

That is, if the uplink CCs of several serving cells belong to different frequency bands, but the frequencies of these CCs are very close, the serving cells may be divided into the same group; conversely, if the uplink CCs of several serving cells are Although they belong to the same frequency band, the frequency gaps of these CCs are large, and these service cells can also be divided into different groups.

For example, suppose the UE is configured with 5 serving cells, and the corresponding uplink CCs are: CC1, CC2, CC3, CC4, CC5, CC1 and CC2 belong to frequency band A, CC3 and CC4 belong to frequency band B, and CC5 belongs to frequency band C, if CC2 and If the absolute value of the difference between the frequencies of CC3 is less than the first threshold, the serving cell 2 and the serving cell 3 may be classified into the first group. If the absolute value of the difference between the frequencies of CC4 and CC5 is less than the first threshold, the service may be used. The cell 4 and the serving cell 5 are classified into the second group. If the absolute value of the difference between the frequencies of CC1 and CC2 is greater than the second threshold, the serving cell 1 is not divided into the first group, and the serving cell 1 can be separately divided into the third group. group.

Dividing the serving cells with the uplink carrier frequency in multiple different frequency bands into the same group can reduce the complexity of random access, and dividing the serving cells with the uplink carrier frequency in the same frequency band into different groups can improve the accuracy of uplink synchronization. Sex. In this step, the eNB notifies the UE of the packet information, and the packet information is used to indicate which serving cell is divided into which group. At the same time, the eNB also informs the UE of the identity of the group to which each serving cell belongs, and the identifier of the group may be in the form of Any form, such as number, index, etc., is only used to distinguish between different groups. The specific method of notification is: The eNB sends a radio resource control RRC message to the UE, where the message carries the packet information and the identifier of the group to which each uplink serving cell belongs.

Specifically, when the eNB can configure/reconfigure the serving cell of the UE by using the RRC connection reconfiguration message, the RRC parameter configuration includes the parameter configuration at the cell level and the parameter configuration at the UE level. The parameter configuration of the cell level means that the parameter configuration of the part is applicable to all UEs in the same eNB; and the parameter configuration of the UE level means that the parameter configuration of the part is specifically applicable to the current UE. When the eNB informs the UE about the packet information and the group identifier of the serving cell, it may be included in the parameter configuration of the cell level, or may be included in the parameter configuration of the UE level. If included in the parameter configuration at the cell level, the serving cell grouping mode is the same for all UEs. If the packet information of the serving cell is included in the parameter configuration of the UE level, the serving cell grouping manner may be different for different UEs.

Step 102: The eNB configures different TA values for each group.

In this step, specifically, which group is configured with a large TA value is determined according to actual conditions. For example, in combination with FIG. 3, for a UE that is in the overlapping coverage of CC1 and CC2, the group corresponding to the CC 1 has a larger TA value. The corresponding TA value of the group to which CC2 belongs is smaller. For the specific configuration, refer to the principle of configuring different TA values for different UEs in the prior art.

To obtain the TA value configured by the eNB for each group, the UE must perform a random access procedure. Therefore, the embodiment of the present invention further includes:

Step 103: The UE obtains the TA value corresponding to each d and group by using a random access procedure, and each serving cell in the group uses the corresponding TA value of the group as its corresponding TA value.

The acquisition of each TA value requires the corresponding random access process to be completed, assuming a total of 3 For the group, the corresponding TA values of each group must be obtained through three random access procedures. The random access process of each group is the same as the prior art, and will not be described here.

For example, suppose the serving cell 1 and the serving cell 2 are classified into the first group, the serving cell 3 and the serving cell 4 are classified into the second group, and the serving cell 5 is divided into the third group, and the first group passes the random access process. Obtaining the TA-1 corresponding to the first group, the second group obtains the TA-2 corresponding to the second group through the random access process, and the third group obtains the TA_3 corresponding to the third cell through the random access procedure.

After each group obtains the TA value, each serving cell in the group uses the corresponding TA value of the group as its own corresponding TA value. For example, the TA value corresponding to the serving cell 1 is TA_1, and the TA value corresponding to the serving cell 2 is TA_1. The TA value corresponding to the monthly service cell 3 is TA_2, the TA value corresponding to the serving cell 4 is TA_2, and the TA value corresponding to the serving cell 5 is TA_3.

Further, similar to the prior art, if the uplink synchronization condition of the UE is deteriorated due to the movement of the UE or other reasons, the eNB also notifies the UE to adjust the TA value through the MAC control unit, which is different from the prior art in the existing In the technology, the MAC control unit only carries one TA value. In the present invention, the TA values of multiple serving cells need to be updated, so the content and format carried by the MAC control unit need to be changed. Description.

Step 104: The eNB sends the TA update value corresponding to each group to the UE. For each group, the UE adds the TA update value corresponding to the group to the TA value corresponding to the group in step 103, as the corresponding update of the group. The TA value, each serving cell in the group uses the updated TA value corresponding to the group as its corresponding updated TA value.

In this step, the eNB may send the TA update value corresponding to the group to the UE in the following manners:

In the first method, the eNB sends a MAC control unit on any one of the service cells, and the MAC control unit carries the TA update value corresponding to all the groups, and the carried TA update value is carried. The MAC Control Unit sends to the UE.

In the first method, if multiple TA update values are sent in the same MAC control unit of the same serving cell, a new MAC control unit format needs to be introduced, because the TA value MAC control in Rel-10 and the previous protocol version. The unit is of fixed length and has a length of 1 byte (byte), which cannot meet the requirements of multiple TA value variable length MAC control units.

Multiple TA update values are included in the same MAC control unit. There are also different implementation methods. The following two examples are only used.

For example, one method is to use a one-byte bitmap to identify the TA update value corresponding to multiple groups in the MAC control unit (the first byte is called a bitmap), for example, if the carried TA If the update value is N, the number of bytes of the MAC control unit is N+1, where the first byte represents the group corresponding to the carried TA update value, and the remaining N bytes are respectively represented in the order of the group. The corresponding TA update value of each group. Among the N bytes, the first two bits of each byte are reserved bits "R", and the remaining six bits are the TA update values corresponding to the group. 6 is a schematic diagram of an embodiment in which two TA update values are represented by a bitmap. As shown in FIG. 6, the MAC control unit includes three rows, each of which is 8 bits, that is, one byte per behavior, the first byte. The group corresponding to the TA update value, if the TA update value corresponding to the first group and the second group is carried, the first byte is 00000011, and so on, if the first group, the second group, and the first group are carried 3 The corresponding TA update value of the group, the first byte is 00000111. If the TA update value corresponding to the second group and the third group is carried, the first byte is 00000110. Here, FIG. 6 only takes the first group and the second group as an example. The first two bits in the second byte are reserved bits "R", the remaining six bits are the TA update value TA_1 corresponding to the first group, and the first two bits in the third byte are reserved bits "R", the remaining six The bit is the TA update value TA-2 corresponding to the second group. It can be seen that the format of the second byte and the third byte is the same as that of the prior art MAC control unit. It should be noted that the format of the above bitmap is only an example, and is not intended to limit the existence of only one embodiment described above. For example, another method is to identify each TA group by using a reserved bit "R" in the MAC control unit. For example, if the carried TA update value is N, the number of bytes of the MAC control unit is N, The first two digits of each byte represent the identity of the TA group, and the remaining six digits are the TA update values corresponding to the 'j, group. 7 is a schematic diagram of an embodiment in which two TA update values are represented by a reserved bit "R". As shown in FIG. 7, the MAC control unit includes two bytes. In the first byte, the first two bits indicate the first. The group's logo 'Ό0', the remaining six digits are the TA update value TA-1 corresponding to the first group, and in the second byte, the first two digits indicate the second group's logo 'ΌΓ, and the remaining six digits correspond to the second group. The TA update value TA-2.

Since in the first method described above, the plurality of TA update values are included in the same MAC control unit, the timings at which the plurality of TA update values arrive at the UE are the same.

In addition, before the MAC control unit, a logical channel identifier (LCID) (not shown) is included as part of the MAC sub-header for identifying the information type of the MAC control unit, that is, indicating the MAC. The information in the control unit is a plurality of TA update values, and the UE can identify the information represented by each bit in the MAC control unit according to the LCID.

In a second method, the eNB sends multiple MAC control units on any one serving cell, each MAC control unit carries a group corresponding TA update value, and sends each MAC control unit that carries the TA update value to the UE. .

The multiple TA update values may also be sent in different MAC control units of the same serving cell. The eNB configures multiple MAC control units of one serving cell, and the sum of the number of MAC control units is equal to the sum of the number of TA update values to be carried. Each MAC control unit carries a group corresponding TA update value.

For example, if the carried TA update value is N, the total number of MAC control units is N, where each MAC control unit is one byte, and the first two bits of each byte are the identity of the group, and the remaining Six digits are the TA update values for the group. Figure 8 is an illustration of an embodiment of two MAC control units with two TA update values respectively included in the same serving cell Intention, as shown in FIG. 8, the MAC control unit 1 is one byte, the first two bits indicate the identifier of the first group ''0', and the remaining six bits are the TA update value TA-1 corresponding to the first group, and the MAC control unit 2 For one byte, the first two digits indicate the identifier of the second group ' ΌΓ, and the remaining six digits are the TA update value TA-2 corresponding to the second group.

Since in the second method described above, the plurality of TA update values are included in different MAC control units, the timing at which the plurality of TA update values arrive at the UE may be different.

In addition, before each MAC control unit, a logical channel identifier (LCID) (not shown) is included as part of the MAC sub-header for identifying the information type of the MAC control unit, UE The information represented by each bit in the MAC Control Unit can be identified based on the LCID.

In a third method, the eNB sends multiple MAC control units on multiple serving cells, each MAC control unit carries a group corresponding TA update value, and sends each MAC control unit that carries the TA update value to the UE. .

The multiple TA update values may also be sent in different MAC control units of different serving cells. The eNB sends multiple MAC control units on multiple serving cells, and the total number of MAC control units may be equal to the number of TA update values that need to be carried. Sum, each MAC control unit carries a group corresponding TA update value.

For example, if the carried TA update value is N, the total number of MAC control units is N, where each MAC control unit is one byte, and the first two bits of each byte are identifiers indicating the group. The remaining six digits are the TA update values for the group. 9 is a schematic diagram of an embodiment of two MAC control units with two TA update values respectively included in two serving cells. As shown in FIG. 9, the eNB transmits the MAC Control Unit 1 on the serving cell 1, the MAC Control Unit 1 is one byte, the first two bits indicate the identifier of the first group 'Ό0', and the remaining six bits are the TA corresponding to the first group. Update the value TA_1. The eNB sends the MAC Control Unit 2 on the serving cell 2, the MAC Control Unit 2 is one byte, and the first two bits indicate the identity of the second group. "01", the remaining six digits are the TA update value TA-2 corresponding to the second group.

Since in the above third method, a plurality of TA update values are included in different MAC control units of different serving cells, the timings at which the plurality of TA update values arrive at the UE may be different.

At this point, the process ends.

In summary, in the present invention, the eNB divides a plurality of serving cells into a plurality of groups, each group includes at least one serving cell, and notifies the UE of the group information and the identifier of the group to which each serving cell belongs. The UE obtains the TA value corresponding to each 'j, group through a random access procedure, and each serving cell in the group uses the corresponding TA value of the group as its own corresponding TA value, and the eNB uses the MAC control unit to determine the TA value of each group. Make adjustments. It can be seen that the method provided by the present invention enables one UE to acquire multiple TA values.

In addition, the method for transmitting the initial TA value in the prior art and the method for transmitting the TA update value are still used in the present invention, but only when the initial TA value is transmitted, how to transfer multiple TA values to the UE in units of groups is considered. When performing the transfer of the TA update value, it is considered to change the format of the MAC control unit to implement the transfer of multiple TA values. Therefore, the solution of the present invention ensures backward compatibility with the LTE version. Corresponding to the method for obtaining the uplink timing advance in the foregoing carrier aggregation, the embodiment of the present invention further provides a device for obtaining an uplink timing advance in carrier aggregation, where a plurality of serving cells, each serving cell, are configured in advance for the user equipment UE The uplink CC is included for the UE to use the configured multiple uplink CCs for uplink data transmission at the same time. The device includes: a grouping module, configured to divide a plurality of serving cells into a plurality of groups, each group comprising at least one serving cell, and notifying the UE of the group information and the identifier of the group to which each serving cell belongs;

A configuration module is configured to configure different uplink timing advance TA values for each group. Further, similar to the prior art, if the uplink synchronization condition of the UE is deteriorated due to the movement of the UE or other reasons, the device also notifies the UE to update the TA value through the MAC control unit. Specifically, the device may further include:

a first sending module, configured to send a media access access MAC control unit on any one of the serving cells, where the MAC control unit carries a TA update value corresponding to all the groups, and sends the MAC control unit that carries the TA update value to UE; and/or

a second sending module, configured to send, by using any one of the serving cells, a plurality of media access MAC control units, where each MAC control unit carries a group corresponding TA update value, and each MAC control that carries the TA update value The unit is sent to the UE; and/or

a third sending module, configured to send multiple MAC control units on multiple serving cells, each MAC control unit carries a group corresponding TA update value, and sends each MAC control unit that carries the TA update value to UE.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

Claim

A method for obtaining an uplink timing advance in carrier aggregation, wherein a plurality of serving cells are configured in advance for a user equipment UE, and each serving cell includes an uplink CC, so that the UE uses the configured multiple uplink CCs to simultaneously perform uplink data. Transmission, characterized in that the method comprises: the base station eNB divides the plurality of serving cells into groups, and the services included in each group

The number of districts is at least one, and the group information and the identifier of each service d and the group to which the district belongs are notified to the UE;

The eNB configures different uplink timing advance TA values for each group.

2. The method according to claim 1, wherein the method for distinguishing a plurality of services into a plurality of groups comprises:

The serving cells whose uplink carrier frequency belongs to the same frequency band are divided into the same group; or, the uplink carrier frequency belongs to different frequency bands, but the serving cell whose absolute value of the frequency interval is smaller than the first threshold is divided into the same group, and the uplink carrier frequency belongs to the same group. For the frequency band, but the absolute value of the frequency interval is greater than the second threshold of the service d, the area is divided into different groups.

The method according to claim 1, wherein the method for notifying the UE of the packet information and the identifier of the group to which each serving cell belongs includes: the eNB sends a radio resource control RRC connection reconfiguration message to the UE, the message Carry the group information and the identity of the group to which each service cell belongs.

The method according to claim 1, further comprising: obtaining, by the UE, a corresponding TA value of each group by using a random access procedure.

The method according to claim 4, wherein the method further comprises: the eNB sending, to the UE, a TA update value corresponding to each group, and for each group, the UE updates the corresponding TA update value to the group. The corresponding TA values are added, and as the updated TA value corresponding to the group, each serving cell in the group will make the corresponding updated TA value of the group. The updated TA value for itself.

The method according to claim 5, wherein the method for sending the TA update value corresponding to each group to the UE is: the eNB sends a media access access MAC control unit on any one of the serving cells, the MAC The control unit carries the TA update value corresponding to all the groups, and sends the MAC control unit that carries the TA update value to the UE.

The method according to claim 6, wherein in the MAC control unit, a bitmap of the first byte is used to identify a TA update value corresponding to multiple groups, wherein if the TA update value is carried For N, the number of bytes of the MAC control unit is N+1, where the first byte represents the group corresponding to the TA update value carried, and the remaining N bytes are sequentially represented in the order of 'j, group, respectively. The TA update value corresponding to each d and group, among the N bytes, the first two bits of each byte are reserved bits, and the remaining six bits are the TA update values corresponding to the group.

The method according to claim 6, wherein if the MAC update unit carries a TA update value of N, the number of bytes of the MAC control unit is N, and the first two bits of each byte are representations. The team's logo, the remaining six are the corresponding TA update values for the group.

The method according to claim 5, wherein the method for sending the TA update value corresponding to each group to the UE is: the eNB sends multiple media access MAC control units on any one of the serving cells, each The MAC control unit carries a group corresponding TA update value, and sends each MAC control unit carrying the TA update value to the UE.

The method according to claim 5, wherein the method for sending the TA update value corresponding to each group to the UE is: the eNB sends multiple MAC control units on multiple serving cells, and each MAC control The unit carries a group corresponding TA update value, and sends each MAC control unit that carries the TA update value to the UE.

The method according to claim 9 or 10, wherein if the number of TA updates carried by the MAC control unit is N, the sum of the number of MAC control units is N, Each MAC control unit is one byte, and the first two digits of each byte are identifiers indicating the group, and the remaining six digits are TA update values corresponding to the group.

A device for obtaining an uplink timing advance in a carrier aggregation, where a plurality of serving cells are configured in advance for a user equipment UE, and each serving cell includes an uplink CC, so that the UE uses the configured multiple uplink CCs simultaneously. Uplink data transmission, characterized in that the device comprises:

A configuration module is configured to configure different uplink timing advance TA values for each group.

The device according to claim 12, further comprising: a first sending module, configured to send a media access access MAC control unit on any one of the serving cells, wherein the MAC control unit carries all groups Corresponding TA update value, and sending the MAC control unit carrying the TA update value to the UE.

The device according to claim 12, further comprising: a second sending module, configured to send, on any one of the serving cells, a plurality of media access MAC control units, wherein each MAC control unit carries one The corresponding TA update value of the group, and sending each MAC control unit carrying the TA update value to the UE.

15. The apparatus of claim 12, wherein the apparatus further comprises: