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Enhancement to UMTS Cell Search – Excluding Cells from Search

IP.com Disclosure Number: IPCOM000126662D
Publication Date: 2005-Aug-10
Document File: 1 page(s) / 27K

Publishing Venue

The IP.com Prior Art Database

Abstract

The nature of this invention would be characterized as embedded software for UMTS mobile devices. In 3GPP TS25.304 (5.2.3.1.1a) when describing the initial cell selection, it is stated- “The UE (User Equipment) shall scan all RF (radio frequency) channels in the UTRA (Universal Terrestrial Radio Access) band according to its capabilities to find a suitable cell of the selected PLMN (Public Land Mobile Network). On each carrier, the UE need only search for the strongest cell. Once a suitable cell is found, this cell shall be selected.” In the case where the strongest cell at a particular frequency is not available (because of faulty system information or because it is barred), the next best cell on that frequency cannot be selected, even though it may be the best available cell. This invention attempts to solve two solutions to the above problem. First, once the strongest cell is found to be unavailable, a new cell search is started with the strongest cell specifically excluded from the search. This means that the next strongest cell on that frequency will be returned by the cell search procedure. Additionally, rather than just searching for the strongest cell, the UE may search for more than one cell per frequency. If the strongest cell is then found to be unavailable, the second best call can be used without the need for another cell search to be performed.

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Enhancement to UMTS Cell Search – Excluding Cells from Search

Disclosed Anonymously

            The nature of this invention would be characterized as embedded software for UMTS mobile devices.  In 3GPP TS25.304 (5.2.3.1.1a) when describing the initial cell selection, it is stated- “The UE (User Equipment) shall scan all RF (radio frequency) channels in the UTRA (Universal Terrestrial Radio Access) band according to its capabilities to find a suitable cell of the selected PLMN (Public Land Mobile Network).  On each carrier, the UE need only search for the strongest cell.  Once a suitable cell is found, this cell shall be selected.”

In the case where the strongest cell at a particular frequency is not available (because of faulty system information or because it is barred), the next best cell on that frequency cannot be selected, even though it may be the best available cell.

           

            This invention attempts to solve two solutions to the above problem.  First, once the strongest cell is found to be unavailable, a new cell search is started with the strongest cell specifically excluded from the search.  This means that the next strongest cell on that frequency will be returned by the cell search procedure. Additionally, rather than just searching for the strongest cell, the UE may search for more than one cell per frequency.  If the strongest cell is then found to be unavailable, the second best call can be used witho...