Handover Management in Group Calls
First Claim
1. A method of indicating, by a mobile terminal of a digital cellular radiocommunication system that is in receiving phase in a group call while roaming in a current cell, to a fixed network element of said system, a given destination cell out of a number N of cells adjacent to said current cell, wherein:
- the system uses a time and/or frequency division multiple access method, and any modulation method;
the mobile terminal sends an identification sequence of the destination cell in a time slot of an inbound signalling channel that is a channel with contention;
the identification sequence comprises a determined identification pattern out of a determined number P of identification patterns of different respective values, where P is an integer such that 1<
P≦
N; and
,the values of the P identification patterns are such that they correspond to mutually-orthogonal modulated signals.
3 Assignments
0 Petitions
Accused Products
Abstract
A mobile terminal of a digital cellular radiocommunication system that is in the receiving phase in a group call while roaming in a current cell, indicates to a fixed network element of the system, a given destination cell out of a number N of cells adjacent to the current cell The system uses a time and/or frequency division multiple access method, and any modulation method. The mobile terminal sends an identification sequence of the destination cell in a time slot of an inbound signalling channel which is a contention channel. The identification sequence comprises a predetermined identification pattern out of a determined number P of identification patterns of different respective values, where P is an integer number such that 1<P≧N The values of the P identification patterns are such that they correspond to mutually-orthogonal modulated signals
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Citations
24 Claims
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1. A method of indicating, by a mobile terminal of a digital cellular radiocommunication system that is in receiving phase in a group call while roaming in a current cell, to a fixed network element of said system, a given destination cell out of a number N of cells adjacent to said current cell, wherein:
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the system uses a time and/or frequency division multiple access method, and any modulation method; the mobile terminal sends an identification sequence of the destination cell in a time slot of an inbound signalling channel that is a channel with contention; the identification sequence comprises a determined identification pattern out of a determined number P of identification patterns of different respective values, where P is an integer such that 1<
P≦
N; and
,the values of the P identification patterns are such that they correspond to mutually-orthogonal modulated signals. - View Dependent Claims (2, 3, 4, 5, 13)
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6. A method of identification by a fixed network element of a digital cellular radiocommunication system, of a destination cell indicated by a mobile terminal of said system that is in receiving phase in a group call while roaming in a current cell, said destination cell being defined from a determined number N of cells adjacent to said current cell, wherein:
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the system uses a time and/or frequency division multiple access method, and any modulation method; the fixed network receives from the mobile terminal an identification sequence of the destination cell in a time slot of an inbound signalling channel which is a contention channel; the identification sequence comprises a determined identification pattern out of a determined number P of identification patterns of different respective values, where P is an integer such that 1<
P≦
N;the values of the P identification patterns are such that they correspond to mutually-orthogonal modulated signals; and
,the fixed network element recovers the received identification pattern and identifies the destination cell from said identification pattern and said rank. - View Dependent Claims (7, 8, 9, 10, 14)
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11. (canceled)
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12. (canceled)
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15. A mobile terminal of a digital cellular radiocommunication system which uses a time and/or frequency division multiple access method, and any modulation method, wherein:
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the mobile terminal is configured to indicate, when it is in receiving phase in a group call while roaming in a current cell, to a fixed network element of said system, a given destination cell out of a number N of cell, adjacent to said current cell, by sending an identification sequence of the destination cell in a time slot of an inbound signalling channel that is a channel with contention; the identification sequence comprises a determined identification pattern out of a determined number P of identification patterns of different respective values, where P is an integer such that 1<
P≦
N; and
,the values of the P identification patterns are such that they correspond to mutually-orthogonal modulated signals. - View Dependent Claims (16, 17, 18, 19)
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20. A fixed network element of a digital cellular radiocommunication system which uses a time and/or frequency division multiple access method, and any modulation method, wherein:
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the fixed network element is configured to receive an indication from a mobile terminal a of said system, when said mobile terminal is in receiving phase in a group call while roaming in a current cell, of a given destination cell out of a number N of cells adjacent to said current cell, by receiving an identification sequence of the destination cell in a time slot of an inbound signalling channel that is a channel with contention; the identification sequence comprises a determined identification pattern out of a determined number P of identification patterns of different respective values, where P is an integer such that 1<
P≦
N; and
,the values of the P identification patterns are such that they correspond to mutually-orthogonal modulated signals. - View Dependent Claims (21, 22, 23, 24)
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Specification