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Random access method in multi-cell ofdma networks

A technology of orthogonal frequency division multiple access and random access, which is applied in the directions of multi-frequency code system, signaling distribution, separation device of transmission path, etc.

Inactive Publication Date: 2006-03-01
SAMSUNG ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, in an OFDMA system using multiple subcarriers, although the throughput of the cell can be improved, frequency reuse must be considered
Unfortunately, studies considering frequency reuse rates have not been conducted

Method used

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  • Random access method in multi-cell ofdma networks
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  • Random access method in multi-cell ofdma networks

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Embodiment Construction

[0024] Preferred embodiments of the present invention are described herein below with reference to the accompanying drawings. In the drawings, the same or similar elements are denoted by the same reference numerals even if they are depicted in different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

[0025] In the preferred embodiment of the present invention, it is assumed that the number of uplink random access channels of all cells is N.

[0026] exist image 3 A flow chart of a random access method in a multi-cell OFDMA network in which the reuse rate of multiple channels is considered according to a preferred embodiment of the present invention is shown in .

[0027] refer to image 3 , according to the random access method of the present invention, in step 301, the number of random access request retries is set to 0. Next, in step 301, each user e...

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Abstract

Disclosed is an upstream access method in an Orthogonal Frequency Division Multiple Access (OFDMA)-based mobile communication system in which a random access method in an OFDMA network includes randomly selecting, by each subscriber device, one of a plurality uplink random access channels, if a random access request to the OFDMA network is transmitted by each subscriber device, accessing through the selected channel if a collision has not occurred in the selected channel, randomly selecting one of the uplink random access channels, if a collision has occurred in the selected channel, and if the number of retries for channel selection is less than a predetermined value, and determining whether a has collision has occurred, accessing through a finally selected channel, if it is determined that a collision has occurred; and randomly selecting one of the uplink random access channels if it is determined that a collision has occurred.

Description

technical field [0001] The present invention generally relates to an upstream access (upstream access) method in a mobile communication system based on Orthogonal Frequency Division Multiple Access (OFDMA), and in particular to a random access method. Background technique [0002] In the next-generation mobile communication system, high-speed and high-quality data transmission will be required in order to support various multimedia services with improved quality. Recently, Orthogonal Frequency Division Multiple Access (OFDMA) technology has been developed as one of technologies satisfying requirements for high-speed and high-quality data transmission. [0003] exist figure 1 A block diagram illustrating a typical OFDMA communication system is shown in . The OFDMA communication system has a multi-cell structure, including a base station (BS) 11, a network 100 connected to the BS 11 to access an Internet Protocol (IP) network (not shown), and a plurality of mobile terminals ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04W74/08
CPCH04L5/0007H04L5/0053H04W74/0866H04L23/02H04W74/0883H04L27/26
Inventor 崔荣埈尹相普朴世雄全贞炫
Owner SAMSUNG ELECTRONICS CO LTD