Intercellular handover method in a radiocommunication system with mobile terminals
AssigneeEads Secure Networks
InventorGérard Marque-Pucheu
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Abstract
In a system of radiocommunication with mobile terminals, the invention proposes to establish a vote configuration or a simulcast configuration for intercellular handover of a communication set up between a mobile terminal (60) and a base station (11) of a current cell (10), said configuration including the current cell (10) and adjacent cells (20, 30) which are eligible for said handover, so as to enable a soft intercellular handover when the terminal (60) moves towards the adjacent cells (20, 30). The invention provides the advantage of reducing the interference level in the neighbouring cells, hence of increasing the frequency re-use rate.
Claims13
A method of intercell handover of a call between a mobile station and a fixed network of an FDMA and/or TDMA cellular radiocommunication system, for handing over the call from the base station of a current cell to the base station of a neighboring cell, the method comprising the following steps:
- a) determination, by the mobile station, of a first indication relative to the quality of the radio link between the mobile station and the base station of the current cell;
- b) scan, by the mobile station of the broadcast control channel of at least one neighboring cell and corresponding determination of a second indication relative to the quality of the radio link between the mobile station and the base station of said neighboring cell;
- c) transmission to the fixed network, by the mobile station, of the first and second indications;
- d) a first comparison, by the fixed network, of the first and second indications in order to deduce therefrom, where necessary, at least one neighboring cell that is eligible for the intercell handover;
- e) allocation, by the fixed network, for the call in the eligible cell, of a traffic channel, at least in the uplink direction, set up at the same frequency and/or the same time slot as a traffic channel in the uplink direction which is allocated to the call in the current cell;
- f) determination, by the fixed network, of a third indication relative to the quality of the radio link between the mobile station and the base station of the current cell;
- g) determination, by the fixed network, of a fourth indication relative to the quality of the radio link between the mobile station and the base station of the eligible cell;
- h) a second comparison, by the fixed network, of the third and fourth indications in order to deduce therefrom, where necessary, an order of intercell handover.
An FDMA and/or TDMA cellular radiocommunication system, comprising at least one mobile station and a fixed network with a network subsystem comprising switching equipment and a radio subsystem having one base station per cell, in which system the mobile station includes:
- means for determining a first indication relative to the quality of the radio link between the mobile station and the base station of a current cell;
- means for polling a broadcast control channel of at least one neighboring cell and for determining a second indication relative to the quality of the radio link between the mobile station and the base station of said neighboring cell;
- means for transmitting the first and second indications to the fixed network;
- and in which system the switching equipment includes:
- first comparison means for comparing the first and second indications in order to deduce therefrom, where necessary, at least one neighboring cell that is eligible for the intercell handover;
- means for allocating, for the call in the eligible cell, a traffic channel, at least in the uplink direction, set up at the same frequency and/or the same time slot as a traffic channel in the uplink direction that is allocated to the call in the current cell;
- means for determining a third indication relative to the quality of the radio link between the mobile station and the base station of the current cell;
- means for determining a fourth indication relative to the quality of the radio link between the mobile station and the base station of the eligible cell;
- second comparison means for comparing the third and fourth indications in order to deduce therefrom, where necessary, an order of intercell handover for handing over the call from the base station of the current cell to the base station of the eligible cell.
A method of intercell handover of a call between a mobile station and a fixed network of an FDMA and/or TDMA cellular radiocommunication system, for handing over the call from the base station of a current cell to the base station of a neighboring cell, the method comprising the following steps:
- a) determination, by the mobile station, of a first indication relative to the quality of the radio link between the mobile station and the base station of the current cell;
- b) scan, by the mobile station, during periodic discrete time intervals, of the broadcast control channel of at least one neighboring cell and corresponding determination of a second indication relative to the quality of the radio link between the mobile station and the base station of said neighboring cell;
- c) transmission to the fixed network, by the mobile station, of the first and second indications;
- d) a first comparison, by the fixed network, of the first and second indications in order to deduce therefrom, where necessary, at least one neighboring cell that is eligible for the intercell handover;
- e) allocation, by the fixed network, for the call in the eligible cell, of a traffic channel, at least in the up link direction, set up at the same frequency and/or the same time slot as a traffic channel in the uplink direction which is allocated to the call in the current cell;
- f) determination, by the fixed network, of a third indication relative to the quality of the radio link between the mobile station and the base station of the current cell;
- g) determination, by the fixed network, of a fourth indication relative to the quality of the radio link between the mobile station and the base station of the eligible cell;
- h) a second comparison, by the fixed network, of the third and fourth indications in order to deduce therefrom, where necessary, an order of intercell handover.
Dependencies are inferred from the claim text.