Method of handling over a call between two relay stations of a cell of a digital cellular mobile radio system
First Claim
1. A method of handing over calls between two relay stations, respectively a current relay station and a target relay station, in the same cell of a digital cellular mobile radio system, said cell being associated with a base transceiver station comprising plurality of relay stations, including said current and target relay stations, geographically distributed within said cell, each relay station comprising at least one antenna connected to at least one transmit/receive device, each relay station having a plurality of traffic channels and a plurality of associated signaling channels, said call being set up for a mobile station and being allocated, from the channels of said current relay station, at least one current traffic channel and at least one current associated signaling channel, wherein said plurality of relay stations shares at least one particular traffic channel, namely a shared traffic channel, which is reserved at least partly for handover, and wherein said method includes the following successive steps:
- a first handover phase in which said shared traffic channel is a first target traffic channel and a second handover phase with a traffic channel associated with said target relay station as a second target traffic channel, said first phase including the following successive steps;
sending by said mobile station of at least one test message to said plurality of relay stations via said shared traffic channel, and selection by said system of said target relay station from said plurality of relay stations, in accordance with at least one predetermined selection criterion based on at least one parameter associated with the quality of reception of said at least one test message.
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Abstract
A method is described of handing over calls between two relay stations, respectively a current relay station and a target relay station in the same cell of a digital cellular mobile radio system, the cell being associated with a base transceiver station comprising a plurality of relay stations including the current and target relay stations and geographically distributed within the cell. Each relay station comprises at least one antenna connected to at least one transmit/receive device. Each relay station has a plurality of traffic channels and a plurality of associated signaling channels. A call being set up for a mobile station is allocated, from the channels of the current relay station, at least one current traffic channel and at least one current associated signaling channel. The plurality of relay stations shares at least one particular traffic channel, constituting a shared traffic channel, which is reserved at least partly for handover. The method includes a first handover phase in which the shared traffic channel is a first target traffic channel. The first phase includes the following successive steps: sending by the mobile station of at least one test message to the plurality of relay stations via the shared traffic channel, and selection by the system of the target relay station from the plurality of relay stations, in accordance with at least one predetermined selection criterion based on at least one parameter associated with the quality of reception of the at least one test message. The method also includes a second handover phase with a traffic channel associated with the target relay station as a second target traffic channel.
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Citations
10 Claims
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1. A method of handing over calls between two relay stations, respectively a current relay station and a target relay station, in the same cell of a digital cellular mobile radio system, said cell being associated with a base transceiver station comprising plurality of relay stations, including said current and target relay stations, geographically distributed within said cell, each relay station comprising at least one antenna connected to at least one transmit/receive device, each relay station having a plurality of traffic channels and a plurality of associated signaling channels, said call being set up for a mobile station and being allocated, from the channels of said current relay station, at least one current traffic channel and at least one current associated signaling channel, wherein said plurality of relay stations shares at least one particular traffic channel, namely a shared traffic channel, which is reserved at least partly for handover, and wherein said method includes the following successive steps:
- a first handover phase in which said shared traffic channel is a first target traffic channel and a second handover phase with a traffic channel associated with said target relay station as a second target traffic channel, said first phase including the following successive steps;
sending by said mobile station of at least one test message to said plurality of relay stations via said shared traffic channel, and selection by said system of said target relay station from said plurality of relay stations, in accordance with at least one predetermined selection criterion based on at least one parameter associated with the quality of reception of said at least one test message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a first handover phase in which said shared traffic channel is a first target traffic channel and a second handover phase with a traffic channel associated with said target relay station as a second target traffic channel, said first phase including the following successive steps;
Specification