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Efficient cell selection

A cell selection and cell technology, applied in the field of communication systems, can solve the problems of reducing the accuracy of cell selection and failing to capture the variability of communication channels

Inactive Publication Date: 2008-12-03
OPTIS WIRELESS TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, the delay spread does not capture all the variability of the communication channel, it also arises from the mobility of the UE and the relay node or BS relative to each other and the related properties of the signals transmitted from different antennas
Highly correlated antennas, such as those producing highly correlated signals, get very little diversity gain, so such antennas cause larger signal variations at the receiver, resulting in reduced cell selection accuracy

Method used

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  • Efficient cell selection
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Experimental program
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Embodiment Construction

[0022] DL in evolved 3G and 4G communication systems may be based on OFDM, according to which data is transmitted on a relatively large set of relatively narrow subcarriers allocated at different frequencies. For simplicity of illustration, this application focuses on OFDM systems, but it is understood that the principles described in this application can be implemented in other digital communication systems.

[0023] figure 2 The basic time-frequency structure of DL in an OFDM system is shown, which shows a plurality of OFDM subcarriers contiguous in the frequency direction. A radio resource dedicated to a particular user may be called a "chunk", which is a particular number of particular subcarriers used for a particular period of time. different sets of subcarriers are used for different users at different times, and figure 2 Chunks of four users A, B, C, D are shown. exist figure 2 In the downlink of the exemplary OFDM system shown, a chunk consists of 15 subcarriers (...

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Abstract

Systems and methods of cell selection are based on measures of frequency selectivity, time selectivity, and / or antenna selectivity. For example, the delay spread and coherence bandwidth of a channel are two measures of frequency selectivity that can be taken into account in the cell selection process. In addition to or instead of either delay spread or coherence bandwidth, Doppler frequency shift or coherence time (which are two measures of time selectivity) and / or antenna correlation or mean signal strength per antenna (which are two measures of antenna selectivity), among other parameters, can be determined and taken into account.

Description

technical field [0001] The present invention relates to communication systems, and more particularly, to digital communication systems. Background technique [0002] Third generation (3G) cellular wireless communication systems based on Wideband Code Division Multiple Access (WCDMA) technology are being deployed around the world. These systems are standardized by specifications published by the 3rd Generation Partnership Project (3GPP). An evolution of WCDMA radio access technology has occurred with the introduction of High Speed ​​Downlink Packet Access (HSDPA) and Enhanced Uplink (UL). [0003] FIG. 1 shows a typical cellular radio telecommunication system 10 . Radio Network Controllers (RNCs) 12, 14 control various radio network functions including, for example, radio access bearer establishment, diversity handover, and the like. In general, each RNC directs calls to and from a mobile station (MS) or remote terminal or user equipment (UE) via the appropriate base stati...

Claims

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Application Information

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IPC IPC(8): H04Q7/38H04L27/26H04B7/08H04W48/20
CPCH04W48/20H04B17/336H04B17/318H04L27/2601H04B17/382H04B17/0057H04B17/0077H04B17/006H04B7/08H04L27/26
Inventor B·林多夫M·艾姆格伦H·阿斯普伦德A·富鲁斯卡N·威伯格
Owner OPTIS WIRELESS TECH LLC