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Method for randomly accessing secondary cell and method for receiving data

A technology of random access and physical random access, which is applied in electrical components, wireless communication and other directions, and can solve the problem of data reception that does not support random access.

Inactive Publication Date: 2013-09-25
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the current solutions do not support the random access problem to the secondary cell under multi-TA carrier aggregation and the data reception problem during the random access process

Method used

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  • Method for randomly accessing secondary cell and method for receiving data

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0080] The UE has accessed the primary cell PCell, and has established an RRC (Radio Resource Control) connection with the serving eNB. The serving base station configures the C-RNTI for the UE, and optionally also includes the SPSC-RNTI. Due to service requirements (such as increased throughput), the serving eNB requires the UE to configure another serving cell, called a secondary cell SCell (including downlink and uplink). The secondary cell SCell (the cell index is 1) belongs to a secondary TA group (sTAG), and the timing advance of the sTAG is different from the timing advance used by the primary TA group (pTAG) to which the primary cell PCell belongs. The SCell belonging to the sTAG is configured by the eNB through RRC signaling.

[0081] After knowing that the SCell belongs to the sTAG, the UE knows that it needs to perform random access on the SCell to obtain uplink timing advance.

[0082] Before controlling the UE to randomly access the SCell, the serving eNB should...

Embodiment approach 2

[0097] The UE establishes an RRC connection with the serving eNB. It is configured with pTAG and two sTAGs (sTAG1 and sTAG2). In addition, the UE has accessed the primary cell PCell in pTAG and the secondary cell SCell' in sTAG1, and has obtained the respective uplink timing advances of pTAG and sTAG1.

[0098] The serving eNB activates the SCell belonging to sTAG2, which requires the UE to access the SCell.

[0099] In the case of cross-carrier scheduling, if the PCell is configured to schedule the SCell across carriers, the PCell can send a random access instruction to access the SCell of the secondary cell to the UE, which is similar to the first embodiment, as shown in figure 1 As shown by arrow A in , the frequency band (including uplink and downlink) occupied by the primary cell PCell is F1. . If SCell' is configured to schedule SCells across carriers, the secondary cell SCell' in sTAG1 can also send random access instructions to UE, such as figure 1 As shown by the ...

Embodiment approach 3

[0108] In the first two embodiments, in order to exemplify the specific implementation of the random access command for randomly accessing the SCell, the DCI 1A and the carrier indicator indicate the cell index of the Scell. In a variant embodiment, the carrier indicator may not be used to indicate the cell index of the random access secondary cell SCell, but a newly designed dedicated information element IE is used to indicate the random access secondary cell SCell, for example, indicating its cell index.

[0109] In another variable implementation manner, it is not necessary to indicate the index of the SCell for random access, but only inform the UE to randomly access the Scell, and the specific SCell for access is determined by the UE itself. For example, the carrier indicator is set to a specific value other than 0, such as 1 (1 bit) or 111 (3 bits) to indicate that the DCI 1A is used to indicate random access to the secondary cell. Alternatively, other information eleme...

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PUM

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Abstract

In the prior art, the condition of identical timing advance in carrier aggregation is concerned, and the random access of a secondary cell under multi-TA carrier aggregation is not supported. The invention provides a method for randomly accessing a secondary cell and a method for receiving data. In the process that the SCell is randomly accessed, user equipment accesses a primary cell, the PCell and the SCell belong to different TA groups, a first cell sends random access instructions (A, A', B) to the UE, and the random access instructions (A, A', B) are used for indicating the UE to access the SCell; the UE sends a random access lead code (C) to the SCell according to the random access instructions. Preferably, the first cell comprises other cells (the PCell, SCell') carrying out cross carrier schedule on the SCell or the SCell. The technical schemes of the random access of the SCell under a multi-TA scene are provided, and the blank of the prior art is filled.

Description

technical field [0001] The present invention relates to random access in the field of wireless communication, in particular to random access in the case of multi-cell carrier aggregation. Background technique [0002] In order to support high data rates, Carrier Aggregation (Carrier Aggregation) is introduced into LTE-A Release 10 (R10). In carrier aggregation, more than two (including two) component carriers (Component Carriers) can be aggregated to one user equipment (UE). In R10, there is such a restriction on component carriers: these component carriers should have the same timing advance (TA, Timing Advance). The timing advance is used to ensure that different UEs can be synchronized when sending uplink data to the base station (eNB). In Release 11 (R11), in order to support more flexible deployment of operators, the industry proposes to cancel this restriction. Therefore, in R11, if the UE has corresponding functions, multiple TAs can be supported. Serving cells (t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
CPCH04W72/12H04W74/0833H04W74/006
Inventor 邓云
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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