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Method for providing cell selection information to cellular radio system terminal, and base station and terminal of the system

A technology for radio system, cell selection, applied in the direction of radio/induction link selection arrangement, selection device, wireless communication, etc.

Inactive Publication Date: 2008-06-04
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no known method or device in the prior art that considers the effect of modulation changes on cell selection

Method used

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  • Method for providing cell selection information to cellular radio system terminal, and base station and terminal of the system
  • Method for providing cell selection information to cellular radio system terminal, and base station and terminal of the system
  • Method for providing cell selection information to cellular radio system terminal, and base station and terminal of the system

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Embodiment Construction

[0036] We begin by discussing the implementation of the invention in the GPRS system.

[0037] The criteria for cell selection and reselection in a prior art manner and their use are described in standard GSM 03.64, version 5.0.0, section 6.5.6.2, giving the following formula for calculating the C31 parameter:

[0038] C31(s)=RLA(s)-HCS_THR(s)≥0 (1a)

[0039] C31(n)=RLA(n)-HCS_THR(n)≥0 (1b)

[0040] In the two formulas, (S) refers to the current cell and (n) refers to a neighbor cell of the current cell. Formula 1a shows how to calculate the parameter C31(S) related to the own cell, and formula (1b) shows how to calculate the parameter C31(n) related to the neighbors of the current cell. The abbreviation RLA stands for "Received Average Level" and it refers to the average power level of radio signals received from a base station. HCS-THR stands for "hierarchical cell structure threshold", which refers to the required minimum received power level. The network signals the HC...

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Abstract

A cellular system comprises base stations and terminals. A certain first base station(105)supports only a certain first modulation method(301)and a certain second base station(104)supports both the first modulation method(301)and a certain second modulation method(302). In order to perform cell reselection there is communicated information to the terminal(101)about which modulation method those base station support, the cells of which are possible new cells for the terminal. A new cell is selected by utilizing the information about which modulation methods the base station support.

Description

technical field [0001] The present invention generally relates to the selection of a cell within which a cellular system terminal is at any given time. In particular, the invention relates to the optimization of cell selection and reselection in systems with cells having different features providing relevant information transmission, and terminals having different capabilities to exploit these features. Background technique [0002] A cellular radio system comprises fixed base stations, each having a certain coverage area, and terminals which are movable relative to the base stations and their coverage areas. This coverage area is also called a cell. A mobile phone is used as an exemplary terminal in this patent application, when a particular mobile phone is switched on, it performs cell selection, in other words it tries to somehow find the best received base station signal And try to register with a so-called location area (LA) representing this base station. Registrati...

Claims

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Application Information

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IPC IPC(8): H04Q7/38H04Q7/32H04W48/20H04W88/06
CPCH04W48/20H04W88/06
Inventor M·约基米斯M·哈卡斯特
Owner QUALCOMM INC