Configuration method and device for random access leading sequence

A random access preamble and random access technology, applied in the field of communication, can solve the problems of random access preamble sequence utilization rate, UE access success rate, low system capacity, inability to adapt to the randomness of UE access time, etc.

Inactive Publication Date: 2012-09-19
深圳市恒程汇文化科技有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing random access preamble allocation generally presets a fixed number of random access preambles during the initial configuration. This allocation method cannot adapt to the randomness of the UE access time in the actual network, resulting in random access preambles utilization rate, UE access success rate, and low system capacity
In order to solve this techni

Method used

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  • Configuration method and device for random access leading sequence
  • Configuration method and device for random access leading sequence
  • Configuration method and device for random access leading sequence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] figure 1 For the flow chart of the random access preamble configuration method according to the embodiment of the present invention, please refer to figure 1 .

[0043] S01. Obtain the average access times of contention random access γ 1 , the average access times of non-competitive random access γ 2 And the total number of random access preamble sequences N sig ;

[0044] S02. Setting the probability Prob_collision of preamble collision between UEs;

[0045] S03. According to the average number of times of random access based on the above contention γ 1 , the average access times of non-competitive random access γ 2 , The total number of random access preamble sequences of the random access system N sig And the probability of preamble collision between UEs Prob_collision configures the number N of dedicated access preambles for non-competitive random access sig2 and the number N of non-dedicated access preambles competing for random access sig1 .

[0046] Let...

Embodiment 2

[0077] The following configures the initial preamble sequence of an LTE cell in a certain FDD system, assuming that the system bandwidth is 10MHz, and the cell can provide services for 7000 UEs.

[0078] S11. Establish a typical busy-hour service model for random access of a UE in the cell, as shown in Table 2;

[0079]

[0080]

[0081] Table 2

[0082] According to the above table, it can be seen that the random access load A=(6+1+2) / 3600×7000=17.5 times / s initiated due to the initial access of the UE in the RRC_IDLE state (including the tracking area update), due to the radio link The random access times B initiated by the RRC_CONNECTED re-establishment after the path error is not considered in the initial configuration, so B=0 times / s, due to the random access times caused by the arrival of uplink data when the uplink is out of sync in the RRC_CONNECTED state Access times C=13.75×2 / 3600×7000=53.5 times / second, therefore, the average access times of competitive rando...

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Abstract

The invention discloses a configuration method and a configuration device for a random access leading sequence; the method comprises the following steps that: the average access times gamma 1 of competitive random access, the average access times gamma 2 of non-competitive random access and the total number Nsig of the random access leading sequence are acquired; the probability Prob_collision of leading sequence collision among user equipment (UE) is set; and the number Nsig2 of the special access leading sequence of the non-competitive random access and the number Nsig1 of the non-special access leading sequence of the competitive random access are configured according to the average access times gamma 1 of the competitive random access, the average access times gamma 2 of the non-competitive random access, the total number Nsig of the random access leading sequence and the probability Prob_collision of leading sequence collision among UE. Through the technical scheme of the invention, the leading sequence collision among the UE can be effectively reduced or prevented, so that the configuration of the random access leading sequence is more comprehensive.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a configuration method and device for a random access preamble. Background technique [0002] The RA (Random Access, random access) of the LTE (Long Term Evolution) system is to provide uplink timing synchronization information for a user equipment (UE, User Equipment), and the network side allocates resources for the UE. The random access in the LTE system is divided into contention random access and non-contention random access. [0003] For contention random access, the UE selects a random access preamble from the random access preamble group of the cell, and initiates random access. When the network side detects the random access preamble of the UE, it sends a random access The response message includes uplink scheduling information in the random access response message, and then the UE sends the message to be transmitted according to the uplink scheduling information. ...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04W74/08
Inventor 唐琳徐云翔
Owner 深圳市恒程汇文化科技有限公司
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