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Method, device and system for random access

A technology of random access and communication system, which is applied in the field of communication and can solve problems such as running out of preamble information

Inactive Publication Date: 2010-02-17
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the embodiments of the present invention provide a random access method, device and system to solve the problem of temporarily running out of dedicated preamble information in the prior art

Method used

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  • Method, device and system for random access
  • Method, device and system for random access
  • Method, device and system for random access

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1. In this embodiment, the user equipment needs to judge the received preamble information.

[0051] When the dedicated preamble information is used up, the eNB selects at least one non-dedicated preamble information from the non-dedicated preamble information, and sends the selected non-dedicated preamble information to the user equipment, and the user equipment initiates a contention mode based on the received non-dedicated preamble information. access. Since the non-dedicated preamble information is allocated to the user equipment by the eNB, the eNB can identify it and respond preferentially to the user equipment.

[0052] Scenarios that require dedicated preamble information include DL data arrive scenarios and scenarios where user equipment performs handover.

[0053] For the DL data arrive scenario, the specific steps can include the following steps, please refer to figure 2 Shown:

[0054] Step 201: eNB selects a non-dedicated preamble information f...

Embodiment 2

[0099] Embodiment 2. In this embodiment, the user equipment does not need to judge the received preamble information, and initiates contention mode random access according to the instruction sent by the eNB.

[0100] Usually, when the eNB sends the dedicated preamble information allocated to the user equipment to the user equipment, it will also send the time-frequency resource information of the dedicated preamble information at the same time, that is, the user equipment is restricted to send random access requests on the designated time-frequency resources. When the dedicated preamble information is used up, if the eNB selects the non-dedicated preamble information from the non-dedicated preamble information set to allocate to the user equipment, there is no need to limit the time-frequency resource, then, the bit indicating the time-frequency resource is idle. These idle bits can be used to notify the user equipment that the preamble information allocated to it is non-dedica...

Embodiment 3

[0127] Example 3, please refer to Figure 9 , which is a structural diagram of a user equipment device in the present invention, including:

[0128] The receiving unit 901 is configured to receive the preamble information allocated by the base station when the dedicated preamble information is exhausted;

[0129] A random access initiating unit 902, configured to initiate contention mode random access according to the preamble information.

[0130] Please refer to Figure 10 , which is a structural diagram of the base station device of the present invention, including:

[0131] A selection unit 1001, configured to select non-dedicated preamble information from a set of non-dedicated preamble information and assign it to user equipment requiring dedicated preamble information when the dedicated preamble information is exhausted;

[0132] A sending unit 1002, configured to send the non-dedicated preamble selected by the selecting unit to the user equipment.

[0133] With ref...

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Abstract

The invention discloses a method, a device and a system for random access. The method for the random access comprises the following steps that: first user equipment receives first preface informationdistributed by a base station when specific preface information is used up; and the first user equipment initiates the random access in a competition mode according to the first preface information. The device for the random access comprises the user equipment comprising a receiving unit and a random access initiating unit, and a base station comprising a selecting unit and a transmitting unit. The method, the device and the system for the random access avoid the time delay for the user equipment to switch and the loss of a data packet, improve the service quality and reduce the time delay ofthe random access.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a random access method, device and system. Background technique [0002] A random access (RA, Random Access) technology is characterized in that all user equipment UEs can randomly send information on a random access channel. In fact, all user equipments compete to access the system, and the winner can temporarily occupy the shared channel to send information. If two or more user equipments use the same preamble to initiate random access on the same time-frequency resource, a collision will occur, causing the two or more user equipments to fail to send. [0003] In the Long Term Evolution (LTE, Long Term Evolution) system, the existing random access technology includes: the base station eNB of the universal terrestrial radio access network allocates a dedicated preamble (Dedicated Preamble) to the user equipment, and the user equipment uses the dedicated preamble ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04Q7/22H04Q7/32H04Q7/30H04B1/707
Inventor 黄曲芳
Owner HUAWEI TECH CO LTD
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