Random access method and system

A random access and random access sequence technology, applied in the field of communication, can solve the problems of long time domain, unavailable extended prefix sequence, and inability to flexibly support channels, etc., to achieve the goal of improving overall performance, speed, and utilization Effect

Inactive Publication Date: 2008-01-30
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] At the same time, the above-mentioned technical solutions also have their own defects: for larger cells, a longer prefix sequence in the time domain is used
Similarly, this related technical solution cannot flexibly support cells of different sizes or channels of different qualities
At the same time, since the two reverse control blocks are not consecutive

Method used

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Examples

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no. 1 example

[0051] In the first embodiment of the present invention, a random access method is provided. The first embodiment will be described below with reference to FIG. 3, which is a flowchart showing a random access method according to the first embodiment of the present invention.

[0052] As shown in Figure 3, the random access method according to the first embodiment of the present invention includes the following steps: Step S302: Determine the cell level for each of the multiple cells, and divide the multiple cells into first-level cells to second-level cells N-level cells, where N is an integer greater than 1; Step S304: When the user initiates an access request, determine the cell level of the cell to which the user belongs; Step S306: According to the determined cell level of the cell, send a message to the cell in the cell according to predetermined rules The user sends a random access sequence (which may be a Walsh code or other orthogonal codes), and in step S308, the base...

no. 2 example

[0067] In the second embodiment of the present invention, a random access method is provided, which differs from the first embodiment in that:

[0068] In step S306, for users in the second-level to Nth-level cells, the random access prefix is ​​no longer divided into multiple parts, and the distance between the user and the base station is no longer considered, but the random access prefix is ​​only continuously and repeatedly sent according to the cell level. The number of times the access sequence is different, wherein the higher the cell level of the cell, the more times the random access sequence is continuously and repeatedly sent.

[0069] Except for what is particularly pointed out above, the random access method according to the second embodiment of the present invention is substantially the same as the random access method according to the first embodiment of the present invention. In order to unnecessarily obscure the present invention, references to Repeated descri...

no. 3 example

[0071] In the third embodiment of the present invention, a random access method is provided, which differs from the random access methods according to the first and second embodiments of the present invention in that:

[0072] In step S306, for users in the second-level to Nth-level cells, the random access prefix is ​​no longer divided into multiple parts, but the random access prefix is ​​still determined according to the distance between the user and the base station and / or the moving speed of the user. The number of access sequences, wherein the farther the user is from the base station and / or the greater the moving speed of the user, the more times the random access sequence is continuously and repeatedly sent.

[0073] Except for the content specifically pointed out above, the random access method according to the third embodiment of the present invention is substantially the same as the random access method according to the first and second embodiments of the present inv...

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Abstract

The invention provides a random access method, which comprises the following steps: first step that: the district grade of each district for a plurality of districts is determined, districts are partitioned from the first grade district to the Nth grade district, wherein, N is an integer bigger than one; second step: when the user sends an access inquiry, the district grade that the user belongs to is determined; and the third step: according to the district grade of the determinate district and the prearrange rules, a random access list is sent to the user in the district. The invention also provides a random access system. Through the above technical program, the invention achieves the following beneficial effects that adopting different random access list to different district through partitioning the district, so the time-frequency resource utilization is improved, the random access speed is improved, and the whole performance of the system is also improved.

Description

technical field [0001] The present invention relates to the communication field, and more particularly, relates to a random access method and a random access system, which can be applied to such as cellular mobile communication systems. Background technique [0002] Current wireless mobile communication systems all need to support a certain number of user terminals. The system includes a certain number of base stations, and each base station needs to communicate with a certain number of users at the same time. [0003] User terminals are randomly scattered within the coverage of base stations in the entire communication system. When the user terminal needs to communicate with the base station, it needs to initiate a random access procedure. Therefore, random access technology plays an important role in various wireless communication multiple access systems. [0004] A random access channel usually consists of two parts, a prefix and a message. The function of the prefix ...

Claims

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Application Information

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IPC IPC(8): H04Q7/38H04W74/08
Inventor 杜颖钢阮卫
Owner STATE GRID CORP OF CHINA
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