Method and apparatus for establishing direct communication for mobiles in a radio communication system
First Claim
Patent Images
1. A method for operating a radiotelephone system, the method comprising:
- at one or more mobile stations of the radiotelephone system, detecting other mobile stations to which radio propagation conditions are sufficiently good;
at the one or more mobile stations, communicating information about the detected mobile stations to a base station of the radiotelephone system;
at a first mobile station, after the detecting the other mobile stations to which the radio propagation conditions are sufficiently good and after the communicating the information about the detected mobile stations, requesting communication with a second mobile station;
at the base station, if the radio propagation conditions between the first mobile station and the second mobile station are sufficiently good, instructing the first mobile station and the second mobile station to establish direct communication; and
at the first mobile station, in response to the instruction to establish direct communication, entering a packet-based connectionless communication mode with the second mobile station, wherein the packet-based connectionless communication mode comprising entering an Opportunity Driven Multiple Access relay mode,wherein the instruction step includes;
initiating a first communication link between the base station and the first mobile station;
communicating a direct communication instruction to the first mobile station;
initiating a second communication link between the base station and the second mobile station;
communicating a direct communication instruction to the second mobile station; and
terminating the first communication link and the second communication link.
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Abstract
A radiotelephone method includes detecting other mobile stations and identifying possible relay candidates among the other mobile stations. The method then includes communicating information about the candidates to a base station. Communication with a second mobile station is requested of the base station at a first mobile station. If the first mobile station and the second mobile station are physically close, the base station instructs the first mobile station and the second mobile station to establish direct communication.
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Citations
11 Claims
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1. A method for operating a radiotelephone system, the method comprising:
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at one or more mobile stations of the radiotelephone system, detecting other mobile stations to which radio propagation conditions are sufficiently good; at the one or more mobile stations, communicating information about the detected mobile stations to a base station of the radiotelephone system; at a first mobile station, after the detecting the other mobile stations to which the radio propagation conditions are sufficiently good and after the communicating the information about the detected mobile stations, requesting communication with a second mobile station; at the base station, if the radio propagation conditions between the first mobile station and the second mobile station are sufficiently good, instructing the first mobile station and the second mobile station to establish direct communication; and at the first mobile station, in response to the instruction to establish direct communication, entering a packet-based connectionless communication mode with the second mobile station, wherein the packet-based connectionless communication mode comprising entering an Opportunity Driven Multiple Access relay mode, wherein the instruction step includes; initiating a first communication link between the base station and the first mobile station; communicating a direct communication instruction to the first mobile station; initiating a second communication link between the base station and the second mobile station; communicating a direct communication instruction to the second mobile station; and terminating the first communication link and the second communication link. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for operating a base station in a radiotelephone system, the method comprising:
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receiving, from respective mobile stations of the radiotelephone system, information about relay candidates of the respective mobile stations; storing the information in respective relay candidate lists; after the receiving the information about the relay candidates and after the storing the information in the respective relay candidate lists, receiving a request from a first mobile station to initiate a call with a second mobile station in the radiotelephone system; based at least in part on a relay candidate list associated with the first mobile station, determining if the second mobile station is physically close to the first mobile station; and if so, instructing the first mobile station and the second mobile station to enter a relay mode for direct link communication; and at the first mobile station, in response to the instruction to enter the relay mode for direct link communication, entering a packet-based connectionless communication mode with the second mobile station, wherein the packet-based connectionless communication mode comprising entering an Opportunity Driven Multiple Access relay mode, wherein the instruction step includes;
initiating a first communication link between the base station and the first mobile station;
communicating a direct communication instruction to the first mobile station;
initiating a second communication link between the base station and the second mobile station;
communicating a direct communication instruction to the second mobile station; and
terminating the first communication link and the second communication link. - View Dependent Claims (8, 9)
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10. A radiotelephone comprising:
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a radio communication circuit configured for two-way radio communication with remote radio devices; a controller configured to control the radio communication circuit; means for detecting other radiotelephones to which radio propagation conditions are sufficiently good; and a memory configured to store information about the detected radiotelephones in the relay candidate list, wherein the controller is configured to control the radio communication circuit to establish a radio link to a remote base station to transmit the relay candidate list to the remote base station, and to transmit a request for communication with another radiotelephone and to receive over the radio link a direct communication instruction generated by the remote base station in dependence on the relay candidate list, and further configured to control the radio communication circuit to interrupt the radio link and establish a relay radio link with the another radiotelephone in response to the direct communication instruction; and
further configured to, in response to the direct communication instruction, enter a packet-based connectionless communication mode with the another radiotelephone, wherein the packet-based connectionless communication mode comprises an Opportunity Driven Multiple Access relay mode;wherein the base station instructs direct communication by; initiating a first communication link between the remote base station and the radio communication circuit; communicating a direct communication instruction to the radio communication circuit; initiating a second communication link between the base station and the another radiotelephone; communicating a direct communication instruction to the another radiotelephone; and terminating the first communication link and the second communication link. - View Dependent Claims (11)
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Specification