Channel assignment method in mobile communications system
First Claim
1. A method for dynamically assigning a communication channel to a mobile station in each base station of TDMA/TDD (Time Division Multiple Access/Time Division Duplex) communications system, comprising the steps of:
- a) receiving a control signal from the mobile station;
b) determining an interference detection criterion depending on a signal strength of the control signal;
c) selecting a channel from a plurality of predetermined channels;
d) determining whether interference occurs in a selected transmitting time slot relative to the interference detection criterion in a selected channel;
e) determining whether interference occurs in a selected receiving time slot relative to a predetermined interference detection criterion in the selected channel; and
f) assigning the selected channel as a communication channel to the mobile station when it is determined that no interference occurs in the selected transmitting and receiving time slots.
1 Assignment
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Accused Products
Abstract
A communication channel is dynamically assigned to a mobile station in autonomous decentralized channel assignment in TDMA/TDD communications system. An interference detection criterion is determined depending on a signal strength of a call request signal. It is determined whether interference occurs in a transmitting time slot relative to the interference detection criterion in a selected channel, and further determined whether interference occurs in a receiving time slot relative to a predetermined interference detection criterion in the selected channel. When it is determined that no interference occurs in the selected transmitting and receiving time slots, the selected channel is assigned to the mobile station.
43 Citations
14 Claims
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1. A method for dynamically assigning a communication channel to a mobile station in each base station of TDMA/TDD (Time Division Multiple Access/Time Division Duplex) communications system, comprising the steps of:
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a) receiving a control signal from the mobile station; b) determining an interference detection criterion depending on a signal strength of the control signal; c) selecting a channel from a plurality of predetermined channels; d) determining whether interference occurs in a selected transmitting time slot relative to the interference detection criterion in a selected channel; e) determining whether interference occurs in a selected receiving time slot relative to a predetermined interference detection criterion in the selected channel; and f) assigning the selected channel as a communication channel to the mobile station when it is determined that no interference occurs in the selected transmitting and receiving time slots. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for dynamically assigning a communication channel to a mobile station in each base station of TDMA/TDD (Time Division Multiple Access/Time Division Duplex) communications system, comprising:
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a first detector for detecting a strength of a control signal received from the mobile station; a second detector for detecting an interference level in a selected transmitting and receiving time slots; a criteria table for storing a plurality of signal strength ranges each corresponding to a different interference detection criterion; and a processor for searching the criteria table for the signal strength of the control signal to determine an interference detection criterion corresponding to the signal strength of the control signal, determining whether interference occurs in a selected transmitting time slot relative to the interference detection criterion in a selected channel, determining whether interference occurs in a selected receiving time slot relative to a predetermined interference detection criterion in the selected channel, and assigning the selected channel as a communication channel to the mobile station when it is determined that no interference occurs in the selected transmitting and receiving time slots. - View Dependent Claims (9, 10, 11, 12)
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13. A carrier sensing method in a base station of autonomous decentralized TDMA/TDD (Time Division Multiple Access/Time Division Duplex) communications system, comprising the steps of:
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receiving a call request signal from a mobile station; determining an interference detection criterion depending on a signal strength of the call request signal; selecting a channel from a plurality of predetermined channels; sensing interference in a selected transmitting time slot relative to the interference detection criterion in a selected channel; sensing interference in a selected receiving time slot relative to a predetermined interference detection criterion in the selected channel, wherein the selected channel is assigned to the mobile station when no interference is sensed in both selected transmitting and receiving time slots. - View Dependent Claims (14)
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Specification