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Random access method

A random access and random access request technology, applied in the field of communication, can solve the problem of high collision probability in the random access process, and achieve the effect of increasing the probability of successful access and reducing delay

Inactive Publication Date: 2018-08-07
BEIJING XINWEI TELECOM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a random access method to at least solve the technical problem of high collision probability in the random access process in the prior art when the number of users is large

Method used

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Embodiment 1

[0013] According to an embodiment of the present invention, an embodiment of a random access method is provided, figure 1 is a flow chart of a random access method according to an embodiment of the present invention, such as figure 1 As shown, the method includes the following steps:

[0014] Step S102: Estimate the downlink channel gain according to the synchronization signal;

[0015] Step S104: sending a random access request;

[0016] Step S106: Receive the returned random access response message and the precoded fixed sequence;

[0017] Step S108: Estimating uplink channel gain according to the precoded fixed sequence;

[0018] Step S110: Decide whether to continue the random access process according to the downlink channel gain and uplink channel gain.

[0019] As an optional embodiment, sending a random access request may include the following steps: selecting any preamble sequence from an available preamble pool; sending a random access request through a physical r...

Embodiment 2

[0025] According to an embodiment of the present invention, an embodiment of a random access method is also provided, figure 2 It is a flowchart of another random access method according to an embodiment of the present invention, such as figure 2 As shown, the method includes the following steps:

[0026] Step S202, broadcasting and sending a synchronization signal;

[0027] Step S204, receiving a random access request message;

[0028] Step S206, precoding the fixed sequence according to the random access request message;

[0029] Step S208, sending a corresponding random access response message and a precoded fixed sequence, the random access response message including uplink transmission resource allocation information;

[0030] Step S210, receiving a radio resource connection control request message on the allocated uplink transmission resource;

[0031] Step S212, sending a corresponding contention resolution message, and allocating data transmission resources for u...

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Abstract

The invention discloses a random access method. The method comprises the following steps: estimating a downlink channel gain according to a synchronization signal; sending a random access request; receiving a returned random access response message and a pre-encoded fixed sequence; estimating uplink channel gain according to the pre-encoded fixed sequence; and deciding whether to continue the random access process according to the downlink channel gain and the uplink channel gain. Through the random access method disclosed by the invention, the success access probability can be improved, and the unsuccessfully accessed user can discover unsuccessful access as early as possible, and the delay of random access process of partial user can be reduced to a certain extent.

Description

technical field [0001] The present invention relates to the technical field of communications, and in particular, to a random access method. Background technique [0002] In LTE, LTE-A, and LTE-A-Pro, the UE needs to establish a connection with the base station through a random access process before initiating communication. The currently used random access process includes four key steps: first, the access UE randomly selects a preamble sequence from the predefined preamble set to send, when multiple UEs simultaneously select a certain preamble sequence , a conflict will occur. But for the base station, in this step, it is only detected whether a certain sequence is sent. In the second step, the base station makes a random access response to each detected preamble sequence, and the response content includes timing advance information, the received preamble ID and an uplink transmission resource allocated to the UE corresponding to the detected preamble sequence . In the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/00H04W74/08H04W76/27
CPCH04W74/002H04W74/085
Inventor 刘兵朝孙鹏
Owner BEIJING XINWEI TELECOM TECH
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