METHOD OF RANDOMLY ACCESSING A SECONDARY CELL AND RECEIVING DATA
First Claim
1. A method in a UE used for randomly accessing a secondary cell, wherein the UE has accessed a primary cell, and the primary cell and the secondary cell belong to different timing advance groups, the method comprising:
- receiving a random access command from the first cell, the command being used for instructing the UE to access the secondary cell;
transmitting a random access preamble to the secondary cell, according to the random access command.
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Accused Products
Abstract
The existing technology focuses on the case of the same timing advance (TA) in carrier aggregation, not supporting randomly accessing a SCell in the multi-TA carrier aggregation. The invention provides a method of randomly accessing a SCell and receiving data. For a procedure of randomly accessing a secondary cell (SCell), the UE has accessed a primary cell (PCell), the PCell and the SCell belong to different timing advance groups, the first cell transmits (A, A′, B) a random access command to the UE, the command is used for instructing the UE to access the SCell; According to the random access command, the UE transmits (C) a random access preamble to the SCell. Preferably, the first cell comprises another cell which cross-carrier schedules the SCell or the SCell. The invention provides a technical solution of randomly accessing a SCell in a multi-TA scenario, which fills the gaps in the existing technology.
24 Citations
13 Claims
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1. A method in a UE used for randomly accessing a secondary cell, wherein the UE has accessed a primary cell, and the primary cell and the secondary cell belong to different timing advance groups, the method comprising:
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receiving a random access command from the first cell, the command being used for instructing the UE to access the secondary cell; transmitting a random access preamble to the secondary cell, according to the random access command. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method used for instructing a UE to randomly access a secondary cell, in a base station to which the first cell belongs, wherein the UE has accessed a primary cell, and the primary cell and the secondary cell belong to different timing advance groups, the method comprising:
transmitting a random access command to the UE, the command is used for instructing the UE to access the secondary cell. - View Dependent Claims (10)
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11. A method of receiving data in a UE, wherein the UE has accessed a primary cell, and is randomly accessing a secondary cell, and the secondary cell and the primary cell belong to different timing advance groups, the method comprising:
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receiving a random access response from the secondary cell in a certain subframe; continuing receiving and decoding a physical downlink channel transmitted by other cells in the subframe. - View Dependent Claims (12, 13)
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Specification