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Random access method and system

A technology of random access and random access to channels, which is applied in communication between multiple stations, radio/induction link selection arrangement, selection device, etc. Guaranteed access performance

Inactive Publication Date: 2008-06-11
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a system design is relatively simple, but it is not conducive to making full use of the time-frequency resources of the system, because there are not only mobile stations far away from the base station in a cell with large coverage, but also a certain proportion of mobile stations close to the base station. The mobile station can use a short sequence to meet the access requirements, which results in a waste of RACH channels. When the proportion of mobile stations that are closer to the base station in the cell is large, this waste is more obvious.

Method used

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Embodiment 1

[0023] Such as figure 2 As shown, it is a flowchart of Embodiment 1 of the random access method of the present invention, and the specific method is as follows:

[0024] Step 201, when the mobile station accesses, the mobile station first reads the downlink synchronization information and broadcast information of the cell to obtain downlink synchronization, all available access sequences and time-frequency distribution patterns of random access channels of various lengths and The random access channel time-frequency pattern corresponding to each moment;

[0025] Such as image 3 As shown, it is a schematic diagram of the distribution model of the variable-length access channel in Embodiment 1 of the random access method of the present invention. Assuming that the coverage of a cell is 2M kilometers, an access sequence with a length of 2K is required. According to the distribution model, 50% of the cell The left and right mobile stations are distributed within the range of M...

Embodiment 2

[0031] In the above-mentioned embodiment, the ratio of the random access channel is optimally designed according to the distribution of the mobile stations, which not only saves the overhead of the system for access, but also ensures that the access performance of the mobile station is not lost. However, in this method, each The distribution pattern of the random access channel of this length is relatively random, and the arrangement of time and frequency diversity is not fully considered.

[0032] Such as Figure 4 As shown, it is a schematic diagram of the variable-length access channel distribution model in Embodiment 2 of the random access method of the present invention, which is a random access channel pattern considering time-frequency diversity, wherein the short sequence is about 60%, and the long access channel The sequence is 40%, and the time-frequency resources saved by the short access channel can be used for data transmission, and the data is not related to the ...

Embodiment 3

[0035] Step 202 of Embodiment 1 selects random access channels of different lengths based on the geographic location of the mobile station. However, due to the complexity of the mobile channel propagation environment in an actual system, it is often very difficult to judge the geographic location of the mobile station, which makes the above method Not accurate enough. In fact, the length (energy) of the access sequence of the mobile station is directly related to the path loss of the mobile station relative to the base station, so it will be more accurate to select the level of the access sequence based on the path loss of the mobile station.

[0036] Such as Figure 5 As shown, it is a flow chart of sending an access sequence in Embodiment 3 of the random access method of the present invention, including the following steps:

[0037] Step 501, the mobile station first obtains downlink synchronization information and broadcast information, so as to obtain downlink synchroniza...

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Abstract

The invention relates to a random access method and comprises that: after a mobile station reads the downlink synchronizing information and broadcast information of a cell, a random access channel with a certain length is selected and sends an access sequence. The invention also relates to a random access system which comprises a mobile station and a base station, wherein, the mobile station is used for reading the downlink synchronizing information and broadcast information of the cell and selects the random access channel with the certain length to send the access sequence; the base station is connected with the mobile station through network and is used for sending the downlink synchronizing information and broadcast information and receiving the access sequence sent by the mobile station. Therefore, the random access method and the system of the invention achieve that the mobile station sends the access sequence through the random access channel which is selected according to the time-frequency distribution patterns of the random access channel. The invention can ensure the access performance, unites the frequency and time resource to design RACH distribution patterns and takes regular changes among various patterns into account to achieve effects of the maximal time and frequency diversity.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a random access method and system. Background technique [0002] Random access is an important step in the physical layer process of mobile communication. It is a process initiated by the mobile station to obtain uplink synchronization and apply for resource allocation after establishing downlink synchronization. It is the first step for the mobile station to initiate communication. [0003] After the mobile station obtains downlink synchronization, it learns all available access sequences in the cell through the cell broadcast message, and then randomly selects a sequence in the resource pool to send on the uplink random access channel to obtain uplink synchronization and request resource allocation. . If the base station successfully detects the sequence and allocates resources for the mobile station, the mobile station successfully accesses the system. On the contr...

Claims

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Application Information

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IPC IPC(8): H04Q7/38H04B7/26
Inventor 曹一卿
Owner HUAWEI TECH CO LTD
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