Wireless regional area network uplink resource distributing method and device using orthogonal frequency division multi access

A resource allocation and allocated technology, applied in the direction of signal channels, etc., can solve the problems of not considering channel allocation, not considering other system interference, etc.

Active Publication Date: 2007-08-29
XFUSION DIGITAL TECH CO LTD
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Problems solved by technology

However, the algorithm does not take into account interference with other systems
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  • Wireless regional area network uplink resource distributing method and device using orthogonal frequency division multi access
  • Wireless regional area network uplink resource distributing method and device using orthogonal frequency division multi access
  • Wireless regional area network uplink resource distributing method and device using orthogonal frequency division multi access

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Embodiment Construction

[0076] In the scheme of the present invention, we will propose a method combining dynamic frequency selection (DFS) with power control and rate matching in a single-input single-output (SISO) wireless area network (WRAN). Specifically, the available spectrum resources consist of a set of 6MHz in the VHF / UHF TV band, and each 6MHz (subband) is occupied by one OFDM symbol. Several subcarriers form a subchannel as a basic allocation unit. Resource allocation includes selection of subbands, subchannels, indication of transmission power and modulation order selected by each user. The object of the present invention is to maximize the weighted transmission capacity without causing interference to existing systems. The present invention successfully provides a cognitive radio method in a WRAN system, which can make full use of frequency spectrum resources while allowing wireless networks to coexist.

[0077] Television channels are divided in frequency at 6MHz intervals, and their ...

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Abstract

First layer resource allocation unit allocates sub band for each CPE. Second layer resource allocation unit allocates sub channel, and transmission parameters of sub channel in sub band corresponding to CPE with already allocated sub band. Basic requirement of IEEE 802.22 WRAN system is that transmission of WRAN user must be transparent for permitted user. In order to reach the target, we uses mask restriction of transmission power based on users to guarantee not generating interference on current users. Moreover, we also put forward optimal algorithm of providing maximized total transmission capacity, and satisfying power restriction based on user, and mask restriction of transmission power. The invention discloses cognition radio method of WRAN system. Making radio networks coexist, the method takes full advantage of resources of frequency spectrum.

Description

technical field [0001] The present invention relates to wireless communication technology, in particular to a WRAN uplink resource allocation method and device using OFDMA. Background technique [0002] Wireless Area Network (WRAN), or IEEE 802.22, shared VHF / UHF TV band between 47MHz-910MHz, which is used by licensed operators and license-exempt (LE) equipment. The goal of WRAN is to provide broadband access to rural and suburban areas by utilizing these unused TV bands in sparsely populated areas. Obviously, the main constraint is to avoid interference with established services such as broadcast television (analog and digital) and public safety systems. Moreover, some medical equipment and wireless microphones that are currently in use also need protection. In order to accommodate different WRAN operators, these protocols are used to coordinate operations among different operators. In this environment, coexistence with existing services and coexistence between WRAN oper...

Claims

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Application Information

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IPC IPC(8): H04L5/02
Inventor 卢思远何嘉明黄蔚蓝王琤刘坚能郑树坤李德富穆乐思缪伟豪吕林军张建伟
Owner XFUSION DIGITAL TECH CO LTD
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