Method and apparatus for mobile-initiated, CDMA-dispatch soft handoff
AssigneeMotorola, Inc.
InventorsMichael L. Needham, Timothy J. Wilson, Leigh M. Chinitz
Life of this patent
Estimating the term…
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.
Claims24
A method for a base site to facilitate mobile-initiated, CDMA-dispatch soft handoff comprising the steps of:
- establishing a first outbound link for a dispatch call;
- transmitting the dispatch call via the first outbound link;
- establishing an inbound link with a mobile station (MS) for the dispatch call;
- receiving, 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 an indication of a second outbound link at the adjacent site enabling the soft handoff;
- and
- indicating to the ms the identity of the second outbound link.
A method for a mobile station (MS) to initiate a CDMA-dispatch soft handoff comprising the steps of:
- 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 base site;
- and
- receiving an indication of a second outbound link at the adjacent site with which to begin the soft handoff.
A base site comprising:
- 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 site 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 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.
A mobile station (MS) comprising:
- 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 using the receiver an indication of a second outbound link at the adjacent site with which to begin the soft handoff.
Dependencies are inferred from the claim text.