Method and arrangement for transferring special cell information in a cellular system
First Claim
1. A method for transferring special cell information in a cellular system from a mobile station to a base station system so that said special cell information comprises a first special cell identity and a second special cell identity, and a transfer code is created which is transferred from the mobile station to the base station system (532) and the second special cell corresponding to the second special cell identity is identified on the basis of a transfer code (611), characterised in that the said transfer code is created based on at least the first and second special cell identity (521, 522) in such a way that the length of the said transfer code is shorter than the length of the second special cell identity.
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Abstract
The invention relates to a method for transferring special cell information in a communications system and a cellular system and mobile station realizing the method. The invention can be advantageously applied to cellular systems specifying cell-specific services for users, such as cell-dependent charging. An idea of the invention is that special cell identities are transferred from a mobile station to a base station system in coded form (521, 522) in such a manner that the transfer of special cell identity information uses fewer bits than what would be needed for the transfer of special cell identities as such. Cell identities are advantageously chosen such that the cell identities of a single area can be coded using a small number of bits. In accordance with the above-mentioned principle according to the invention the transfer can be carried out advantageously in such a manner that the first special cell identity in the special cell list is transferred as such (501) whereafter it is transferred transfer codes (522) which are differences (521) of two consecutive special cell identities in the special cell list. The special cell identities in the special cell list are advantageously arranged in the order of magnitude in the special cell list. Using the solution according to the invention it is possible to transfer the special cell information on the radio path by means of a single short message so that the transfer of special cell information can be carried out quickly without using a lot of the radio path'"'"'s capacity in connection with call setup and handover.
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Citations
14 Claims
- 1. A method for transferring special cell information in a cellular system from a mobile station to a base station system so that said special cell information comprises a first special cell identity and a second special cell identity, and a transfer code is created which is transferred from the mobile station to the base station system (532) and the second special cell corresponding to the second special cell identity is identified on the basis of a transfer code (611), characterised in that the said transfer code is created based on at least the first and second special cell identity (521, 522) in such a way that the length of the said transfer code is shorter than the length of the second special cell identity.
- 11. A cellular system comprising means for selecting a serving base station on the basis of a special cell list which said cellular system comprises means (701-704, 721-723, 750-752) for transferring special cell information from a mobile station to a base station system where upon the said special cell information comprises at least a first special cell identity and a second special cell identity and means for identifying the second special cell corresponding to the second special cell identity on the basis of a transfer code, characterised in that said cellular system comprises means for creating the said transfer code at least on the basis of the said first special cell identity and on the said second special cell identity so that the length of the said transfer code is shorter than the length of the second special cell identity.
- 13. A mobile station (700) connected with a cellular system comprising means (704) for storing and sending special cell information to the base station system where the said special cell information comprises a first special cell identity and a second special cell identity and means for creating and sending a transfer code to the base station system for identifying the second special cell corresponding to the second special cell identity, characterised in that the mobile station also comprises means for creating the said transfer code on the basis of the said first and second special cell identity so that the length of the said transfer code is shorter than the length of the second special cell identity.
Specification