Method and apparatus for providing dispatch scan in a CDMA communication system
First Claim
1. A method for a base site to provide a dispatch scan service to a communication unit in a CDMA communication system, the method comprising the steps of:
- transmitting, by the base site, a channel assignment for a dispatch call via a paging resource;
encoding, by the base site, dispatch communication for the dispatch call using a first CDMA long-code mask;
receiving, by the base site, a request for a CDMA long-code mask transition for the dispatch call;
transmitting, by the base site, a second CDMA long-code mask for the dispatch call in response to the request; and
encoding, by the base site, dispatch communication for the dispatch call using the second CDMA long-code mask after transmitting the second COMA long-code mask.
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Accused Products
Abstract
A CDMA base site provides dispatch group call service to members of a dispatch group by using a first long-code mask. The base site also repeatedly transmits the group call'"'"'s channel assignment so that a scanning communication unit can detect that the call is active. In order for the scanning communication unit to decode the dispatch communication once the call is detected, it requests a long-code mask transition from the base site. The base site then transmits a new long-code mask and begins encoding the dispatch communication using the new mask. Thus, the scanning communication unit is able decode the communication and thereby join the active CDMA dispatch group call.
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Citations
15 Claims
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1. A method for a base site to provide a dispatch scan service to a communication unit in a CDMA communication system, the method comprising the steps of:
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transmitting, by the base site, a channel assignment for a dispatch call via a paging resource;
encoding, by the base site, dispatch communication for the dispatch call using a first CDMA long-code mask;
receiving, by the base site, a request for a CDMA long-code mask transition for the dispatch call;
transmitting, by the base site, a second CDMA long-code mask for the dispatch call in response to the request; and
encoding, by the base site, dispatch communication for the dispatch call using the second CDMA long-code mask after transmitting the second COMA long-code mask. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for a communication unit to obtain dispatch scan service from a base site in a CDMA communication system, the method comprising the steps of:
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scanning, by the communication unit, a paging resource for a channel assignment for a dispatch call;
transmitting, by the communication unit, a request for a CDMA long-code mask transition for the dispatch call, which is encoded using an initial CDMA long-code mask at least before transmitting the request for a CDMA long-code mask transition;
receiving, by the communication unit, a CDMA long-code mask for the dispatch call; and
decoding, by the communication unit, dispatch communication using the CDMA long-code mask for the dispatch call. - View Dependent Claims (9, 10, 11, 12)
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13. A base site comprising:
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a transmitter capable of transmitting a channel assignment for a dispatch call via a paging resource and of transmitting a second CDMA long-code mask for the dispatch call in response to a request for a CDMA long-code mask transition for the dispatch call;
a receiver capable of receiving the request; and
a processor capable of instructing the transmitter to transmit the channel assignment, of encoding dispatch communication for the dispatch call using a first CDMA long-code mask, of instructing the transmitter to transmit the second CDMA long-code mask, and of encoding dispatch communication for the dispatch call using the second CDMA long-code mask after the transmitter transmits the second CDMA long-code mask. - View Dependent Claims (14)
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15. A communication unit comprising:
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a receiver capable of scanning a paging resource for a channel assignment for a dispatch call and of receiving a CDMA long-code mask for the dispatch call;
a transmitter capable of transmitting a request for a CDMA long-code mask transition for the dispatch call, which is encoded using an initial CDMA long-code mask at least before transmitting the request for a CDMA long-code mask transition;
a processor capable of instructing the transmitter to transmit the request and of decoding dispatch communication using the CDMA long-code mask for the dispatch call.
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Specification