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Method and system for multi-carrier stochastic access

A random access, multi-carrier technology, applied in electrical components, wireless communication, etc., can solve problems such as uncertain downlink component carriers

Inactive Publication Date: 2009-08-12
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to propose a multi-carrier random access method, which solves the problem of uncertain downlink component carriers for the base station to send message 2 and message 4 in the prior art, and is backward compatible with LTE

Method used

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  • Method and system for multi-carrier stochastic access

Examples

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Embodiment 1

[0055] Such as figure 2 As shown, after the LTE-A terminal synchronizes to the non-compatible LTE downlink component carrier through cell search and detects the PBCH, its random access process includes the following steps:

[0056] Step 201, the terminal sends message 1 on the uplink component carrier;

[0057] Wherein, after the terminal synchronizes to the non-compatible LTE downlink component carrier through cell search and detects the PBCH, it reads the uplink component carrier information corresponding to the non-compatible component carrier in the system information on the non-compatible component carrier, and according to the system information In the PRACH configuration information, send message 1 on the uplink component carrier indicated by the incompatible component carrier;

[0058] Step 202: After receiving message 1, the base station learns the downlink component carrier corresponding to the uplink component carrier sending message 1 according to the frequency o...

Embodiment 2

[0066] Such as image 3 As shown, after the LTE-A terminal synchronizes to the compatible LTE downlink component carrier through cell search and detects the PBCH, its random access process includes the following steps:

[0067] Step 301, the terminal sends message 1 on the uplink component carrier;

[0068] Wherein, after the terminal synchronizes to a compatible LTE downlink component carrier through cell search and detects the PBCH, it learns the corresponding uplink component carrier according to the frequency of the downlink component carrier and the default frequency interval between the uplink and downlink component carriers, and according to the system information PRACH configuration information, sending message 1 on the uplink component carrier;

[0069] Step 302: After receiving message 1, the base station learns the downlink component carrier corresponding to the uplink component carrier sending message 1 according to the frequency of the uplink component carrier an...

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Abstract

The invention discloses a method for random access of multiple carriers, which is applied to the condition of asymmetrical configuration of uplink and downlink carriers of an advanced long term evolution LTE-A system. The method comprises that: after receiving a leader sequence, a base station acquires a downlink component carrier corresponding to an uplink component carrier sending the leader sequence according to the frequency of the uplink component carrier and default frequency space between the uplink and downlink component carriers, sends random access channel RACH response messages on the downlink component carrier to a terminal, and sends competition resolving messages on the downlink component carrier sending the RACH response messages or the downlink component carrier agreed with the terminal to the terminal. The method can solve the problem of uncertainty of the downlink component carrier sending the RACH response messages and the competition resolving messages, and can maintain backward compatibility with LTE.

Description

technical field [0001] The present invention relates to the field of digital communication, in particular to a method and system for multi-carrier random access under asymmetric configuration of uplink and downlink carriers in a Long Term Evolution Advanced (LTE-A) system. Background technique [0002] In the LTE-A system, in order to support a larger system bandwidth (up to 100MHz) and be backward compatible with existing LTE standards, LTE-A combines the bandwidth of the LTE system to obtain a larger bandwidth. This technology is called carrier aggregation (CA) technology, which can improve the spectrum utilization rate of advanced International Mobile Telecommunications (IMT-Advance) system, alleviate the shortage of spectrum resources, and optimize the use of spectrum resources. use. [0003] In the LTE system, after cell search and physical broadcast channel (Physical broadcast channel, PBCH for short) reception, a terminal (User Equipment, UE for short) needs to estab...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04W74/08
Inventor 夏树强左志松郁光辉米德忠郝鹏梁春丽喻斌
Owner ZTE CORP
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