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

A technology of resource allocation and user terminal equipment, applied in the field of uplink resource allocation

Active Publication Date: 2010-11-03
XFUSION DIGITAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the algorithm does not take into account interference with other systems
In addition, none of the technical solutions in these papers considered channel allocation

Method used

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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

[0074]Television channels are divided in frequency at 6MHz intervals, and their power can be as high as MWatts. With such a high transmit power, an activated TV broadcast station will affect other systems using the same frequency band over a large area. Therefore, in the solution of the present invention, the available frequency band of the WRAN system consists of a series of 6 MHz. Each 6MHz is called a subband consisting of a single OFDM symbol. Each subband contains a set of subchannels, and each subchannel contains some subcarriers. figure 1 The uplink transmission application scenario of a single cell is illustrated. Each CPE uses a specific sub-channel of a specific sub-band to transmit data to the base station, n in the figure b Indicates the subband serial number, n c Indicates the subchannel number. Therefore, the output of the DFS algorithm contains the allocation results of subbands and subchannels. Specifically, DFS performs a two-tiered process. In the fir...

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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 transmissioncapacity, 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, themethod 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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Patent Type & Authority Patents(China)
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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