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Carrier scanning in cellular network

A sub-carrier frequency and identifier technology, which is applied to effectively search a carrier frequency field

Inactive Publication Date: 2004-04-21
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the same problem arises with respect to the Time Division Duplex (TDD) portion of the UMTS band (also known as the "unpaired band")

Method used

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  • Carrier scanning in cellular network
  • Carrier scanning in cellular network
  • Carrier scanning in cellular network

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Experimental program
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Embodiment Construction

[0023] best practice

[0024] The various features of the invention will now be described with respect to the drawings, in which like parts are identified by like reference numerals.

[0025] These and other aspects of the invention will now be described in more detail in connection with several exemplary embodiments. To facilitate an understanding of the invention, many aspects of the invention are described in terms of sequences of operations performed by elements of a computer system. It should be recognized that in each embodiment, various operations may be performed by dedicated circuitry (e.g., separate logic gates interconnected to perform a specific function), by program instructions executed by one or more processors, or by two The combination of those to complete. Furthermore, the present invention may additionally be considered fully embodied in any form of computer-readable storage medium having stored thereon an appropriate set of computer instructions which wil...

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Abstract

A scanning operation in a mobile terminal includes storing identifiers of sub-carrier frequencies known to be in use without regard to operator identity or location of use. A first scanning of only sub-carrier frequencies identified by the stored identifiers is performed in an attempt to find a used sub-carrier frequency. If no used sub-carrier frequencies are found in the first scanning, then a second scanning of sub-carrier frequencies that are not associated with stored identifiers is performed.

Description

field of invention [0001] The present invention relates to mobile communications, and more particularly to methods and apparatus for efficiently searching for a carrier frequency from among a large number of possible carrier frequencies. Background of the invention [0002] Modern mobile communication systems (eg, cellular telephone systems) rely on wireless media, such as wireless technology, to transfer information between communicating parties. Communication is accomplished by adding (eg, by modulation) desired information (eg, information representing audio information) to a carrier frequency. Therefore, in order to communicate, each party to the communication must agree on which carrier frequency to use. [0003] The range of available carrier frequencies is limited and therefore allocated according to government regulations. A portion of the radio frequency spectrum has been allocated for use by a particular type of communication technology (e.g. enhanced data rates ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J1/00H04W48/18
CPCH04W48/18
Inventor P·范德贝里
Owner TELEFON AB LM ERICSSON (PUBL)