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Method and device for random access

A technology of random access and random access process, which is applied in the field of communications and can solve problems such as undeveloped procedures

Active Publication Date: 2013-06-26
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] Under the existing technology, in the LTE-A system, for multiple cells configured for the UE, the random access process of the pcell (primary cell) can refer to the execution mode of the LTE system, and how the scell (secondary cell) should initiate random access The access process is to maintain the uplink synchronization between each cell and the network side. The relevant process has not yet been formulated and needs to be further improved.

Method used

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Embodiment Construction

[0037] In the LTE-A system using CA technology, the present invention provides a method for the situation that the TA (Timing adjustment, uplink synchronization timing advance) information of each cell (secondary cell) configured by the network side for the UE may be different. A method for instructing a UE to initiate an RA (Random Access, random access) procedure by using RRC signaling. Specifically:

[0038]The device on the network side determines the scell configured for the UE, obtains the RA-related parameters set for the scell, and sends the RA-related parameters to the UE, so that the UE, according to the received RA-related parameters, selects the RA-related parameters in each scell configured for it on the network side. , select the scell configured with RA-related parameters to initiate a random access procedure. After the UE on the terminal side receives the RA-related parameters set for each locally configured Scell ​​sent by the network side, according to the ...

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Abstract

The invention discloses a random access method and apparatus so as to perform random access for a User Equipment (UE) with a plurality of aggregated cells in a carrier aggregation-enabled LTE-A system. The method includes: determining a secondary cell configured for a UE and obtaining random access related parameter preset for the secondary cell; and sending the random access related parameter to the UE to instruct the UE to initiate random access procedure over the secondary cell corresponding to the random access related parameter. The inventive method achieves the purpose of enabling the UE to be synchronized with the network side by performing random access over a specified cell, having the UE maintain uplink synchronization with the network side in the configured secondary cell and ensuring the overall performance of the system.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for performing random access. Background technique [0002] In the prior art, for the LTE Advanced system (referred to as the LTE-A system), a higher execution standard than that of the LTE system has been formulated, for example, the peak rate is required to reach 1 Gbps in the downlink and 500 Mbps in the uplink. At the same time, good compatibility between the LTE-A system and the LTE system is required. Based on the improvement of the peak rate, the compatibility with the LTE system and the need to fully utilize spectrum resources, the LTE-A system introduces a CA (Carrier Aggregation, carrier aggregation) technology. [0003] The so-called carrier aggregation technology refers to a mechanism in which a base station can configure multiple cells (cells) for a UE at the same time, so that multiple cells can provide data transmission services for the UE at ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08
CPCH04W74/006H04W74/0833H04W36/0077H04W74/08
Inventor 许芳丽赵亚利梁靖
Owner DATANG MOBILE COMM EQUIP CO LTD
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