Method and apparatus for mobile-initiated, CDMA-dispatch soft handoff
First Claim
1. A method for a base site to facilitate mobile-initiated, CDMA-dispatch soft handoff comprising the steps of:
- establishing, by the base site, a first outbound link for a dispatch call;
transmitting, by the base site, the dispatch call via the first outbound link;
establishing, by the base site, an inbound link with a mobile station (MS) for the dispatch call;
receiving, by the base site from the MS via the inbound link, a request to begin a soft handoff with an adjacent base site;
notifying the adjacent base site of the soft handoff request of the MS;
receiving, by the base site in response to the request to begin a soft handoff from the MS, an indication of a second outbound link at the adjacent site enabling the soft handoff; and
indicating, by the base site, to the MS the identity of the second outbound link.
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Accused Products
Abstract
To address the need for an apparatus and method for CDMA-dispatch soft handoff, the present invention enables mobile-initiated soft handoff for dispatch calls. A mobile station (120) in a dispatch call establishes an individual inbound link (137) with the serving base site (111). When the mobile station determines that a handoff with an adjacent site (112) is needed, the mobile station uses its individual inbound link to request a soft handoff with the adjacent base site. After notifying the adjacent base site, the serving base site then transmits the handoff information to the mobile station to enable the mobile station to begin a soft handoff with the adjacent site.
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Citations
24 Claims
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1. A method for a base site to facilitate mobile-initiated, CDMA-dispatch soft handoff comprising the steps of:
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establishing, by the base site, a first outbound link for a dispatch call;
transmitting, by the base site, the dispatch call via the first outbound link;
establishing, by the base site, an inbound link with a mobile station (MS) for the dispatch call;
receiving, by the base site from the MS via the inbound link, a request to begin a soft handoff with an adjacent base site;
notifying the adjacent base site of the soft handoff request of the MS;
receiving, by the base site in response to the request to begin a soft handoff from the MS, an indication of a second outbound link at the adjacent site enabling the soft handoff; and
indicating, by the base site, to the MS the identity of the second outbound link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for a mobile station (MS) to initiate a CDMA-dispatch soft handoff comprising the steps of:
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receiving a dispatch call via a first outbound link with a base site;
establishing an inbound link with the base site for the dispatch call;
transmitting via the inbound link a request to begin a soft handoff with an adjacent bass site; and
receiving, from the base site in response to the request to begin a soft handoff, an indication of the identity of a second outbound link at the adjacent site with which to begin the soft handoff. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A base site comprising:
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a transmitter;
a receiver; and
a controller, coupled to the transmitter and the receiver, adapted to establish a first outbound link for a dispatch call, adapted to instruct the transmitter to transmit the dispatch call via the first outbound link, adapted to establish an inbound link with a mobile station (MS) for the dispatch call, adapted to receive using the receiver a request to begin a soft handoff with an adjacent base she from the MS via the inbound link, adapted to notify the adjacent base site of the soft handoff request of the MS, adapted to receive, in response to the request to begin a soft handoff from the MS, an indication of a second outbound link at the adjacent site enabling the soft handoff, and adapted to instruct the transmitter to transmit to the MS an indication of the identity of the second outbound link. - View Dependent Claims (18, 19, 20, 21)
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22. A mobile station (MS) comprising:
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a transmitter;
a receiver; and
a processor, coupled to the transmitter and the receiver, adapted to instruct the receiver to receive a dispatch call via a first outbound link with a base site, adapted to establish an inbound link with the base site for the dispatch call, adapted to instruct the transmitter to transmit via the inbound link a request to begin a soft handoff with an adjacent base site, and adapted to receive, from the base site using the receiver and in response to the request to begin a soft handoff, an indication of the identity of a second outbound link at the adjacent site with which to begin the soft handoff. - View Dependent Claims (23, 24)
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Specification