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AssigneeU.S. Philips Corporation
InventorWerner Schmidt
Estimating the term…
Base radio stations are spatially arranged in a radio transmission system in accordance with a cellular system, separating the message transmission channels from adjacent base stations being effected either by using the frequency-division multiplex method or by using the code-division multiplex method or by using a combination of these multiplex methods. In appropriately large spatial distances the same set of channels can be repeated in a further radio cell. If a mobile radio station moves during the conversation from one radio cell into another, then it is necessary to hand-over the then existing radio connection. To avoid the necessity of using additional receivers in each base station and to prevent a repeated hand-over in the event of high co-channel interferences, the measurements used for hand-over decision are effected in the mobile radio station. As part of the method the reception quality of the co-channel message transmission channels of remote base stations are additionally measured in the mobile station during the existence of a radio connection to a near base station.
A method for deciding when to handing-over a radio connection when a mobile radio station (MS) moves from one radio cell into another radio cell in a digital radio transmission system with frequency-division multiplexing of adjacent radio cells and wherein co-channel radio cells are separated by different spread codes, comprising the steps of the reception quality criteria measurements to be effected in the mobile station (MS) for assigning itself one of the radio cells and consequently for the hand-over decision are effected such that additionally during the existence of a radio connection to a near base station (BS) the reception quality of the co-channel message transmission channels are measured in the mobile radio station (MS).
In a radio transmission system comprising multiple radio cells, adjacent cells being frequency multiplexed and at least some non-adjacent radio cells being co-channel, said co-channel radio cells being separated by different spread codes, the method for handing-over a radio connection via a first message transmission channel between a mobile radio station and a first base station in a first cell to a radio connection via a second message transmission channel between said mobile radio station and a second base station in an adjacent radio cell comprising the steps of:
Mobile radio station apparatus for use in a radio transmission system comprising multiple radio cells, adjacent cells being frequency multiplexed and at least some non-adjacent radio cells being co-channel, said co-channel radio cells being separated by different spread codes,
Dependencies are inferred from the claim text.