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Random access method and equipment

A technology of random access and random access preamble, used in electrical components, wireless communication and other directions

Active Publication Date: 2012-01-18
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0043] Embodiments of the present invention provide a random access method and device, which are used to solve the problem of random access on Scell ​​and simultaneous random access of multiple cells in a carrier aggregation system

Method used

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  • Random access method and equipment

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Embodiment Construction

[0091] In order to solve the problem of how the terminal performs random access in the secondary cell or in multiple cells at the same time in the carrier aggregation system, the embodiment of the present invention provides a random access method in the carrier aggregation system corresponding to the terminal side and a random access method corresponding to the base station side. Access processing method.

[0092] see Figure 5 , the random access method in the carrier aggregation system provided by the embodiment of the present invention includes the following steps:

[0093] Step 50: The terminal determines the random access preamble sequence that needs to be sent on the cell that needs to perform random access in the current subframe and the PRACH resource used to send the random access preamble sequence; and transmits to the base station through the PRACH resource on the cell the random access preamble;

[0094] Step 51: The terminal determines that the random access pre...

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Abstract

The embodiment of the invention discloses a random access method and equipment, relating to the technical field of radio communication and being used for solving the problem of random access way in a carrier aggregation system. In the invention, the method comprises the following steps of: sending a random access leader sequence to a base station by a terminal through a PRACH (Physical Random Access Channel) resource on a cell; confirming a random access radio network temporary identification (RA-RNTI) corresponding to the random access leader sequence according to the carrier identification information of the cell and the information of the PRACH resource, and detecting a physical downlink control channel (PDCCH) scrambled by using the RA-RNTI in a public searching space of a main cell; and receiving a physical downlink sharing channel (PDSCH) bearing a random access response corresponding to the random access leader sequence according to the detected PDCCH, and carrying out uplink synchronization adjustment on the cell according to an uplink timing advance (TA) in the random access response. By adopting the random access method and equipment, random access in an auxiliary cell or simultaneous random access in multiple cells in the carrier aggregation system is realized.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a random access method and device. Background technique [0002] A random access procedure (Random access procedure) is divided into contention random access and non-contention random access, and is used to establish uplink synchronization between a terminal (UE, User Equipment) and a base station. [0003] The contention random access is triggered by the medium access control layer (MAC, Medium Access Control) of the UE. The random access preamble (preamble) sent by the UE can be randomly selected in a specific preamble sequence group, and the preamble used for sending the preamble A Physical Random Access Channel (PRACH, Physical Random Access Channel) resource can also be a resource randomly selected within specific multiple resources. Therefore, when multiple UEs select the same PRACH resource and preamble sequence at the same time, there is contention . Reason...

Claims

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Application Information

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IPC IPC(8): H04W74/08
Inventor 高雪娟林亚男赵锐潘学明
Owner DATANG MOBILE COMM EQUIP CO LTD
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