System and method for facilitating a handoff of at least one mobile unit in a telecommunication system
First Claim
1. A method for facilitating a handoff of at least one mobile unit in a telecommunication system having a plurality of base stations providing code division multiple access (CDMA) communication, comprising the steps of:
- generating over an antenna system, by a target base station, a first group of dedicated soft handoff channels being an orthogonally related subset of a separate second group of spread spectrum coded traffic channels wherein the first group of dedicated soft handoff channels are under control of a specified source base station; and
generating, by the target base station, the second group of spread spectrum traffic channels over a collocated antenna system wherein the second group of spread spectrum traffic channels are orthogonally related to the first group of dedicated soft handoff channels.
5 Assignments
0 Petitions
Accused Products
Abstract
A method and system for facilitating a handoff of a remote mobile unit in a communication system 12 having a plurality of base stations (16 and 22), employs base stations (16 and 22) along a coverage area seam (10) that have a soft handoff subsystem (24) collocated with conventional base station circuitry (44) to facilitate soft handoff. The soft handoff subsystem (24) includes a transceiver (36) for generating and receiving a first group of dedicated soft handoff channels that are an orthogonally related subset of a separate second group of spread spectrum coded traffic channels wherein the soft handoff subsystem is under control of the source base station controller (14). The dedicated soft handoff channels are assigned to a specified source base station (16). Preferably the soft handoff subsystem (24) generates only the first group of dedicated soft handoff channels without pilot channels or synchronization channels.
81 Citations
19 Claims
-
1. A method for facilitating a handoff of at least one mobile unit in a telecommunication system having a plurality of base stations providing code division multiple access (CDMA) communication, comprising the steps of:
-
generating over an antenna system, by a target base station, a first group of dedicated soft handoff channels being an orthogonally related subset of a separate second group of spread spectrum coded traffic channels wherein the first group of dedicated soft handoff channels are under control of a specified source base station; and generating, by the target base station, the second group of spread spectrum traffic channels over a collocated antenna system wherein the second group of spread spectrum traffic channels are orthogonally related to the first group of dedicated soft handoff channels. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A system for facilitating a handoff of at least one mobile unit in a telecommunication system having a plurality of base stations providing code division multiple access (CDMA) communication, comprising:
-
a first transceiver, associated with a target base station, that generates over an antenna system a first group of dedicated soft handoff channels being an orthogonally related subset of a separate second group of spread spectrum coded traffic channels wherein the first group of dedicated soft handoff channels are under control of a specified source base station; and a second transceiver collocated with the first transceiver, that generates the second group of spread spectrum traffic channels over a collocated antenna system wherein the second group of spread spectrum traffic channels are orthogonally related to the first group of dedicated soft handoff channels. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
-
-
16. A system for facilitating a handoff of at least one mobile unit in a telecommunication system having a plurality of base stations providing code division multiple access (CDMA) communication, comprising:
-
(a) a target base station having; (i) a soft handoff subsystem comprising; a first transceiver that generates, over an antenna system, a first group of dedicated soft handoff channels being an orthogonally related subset of a separate second group of spread spectrum coded traffic channels; a pilot channel receiver operatively coupled to the antenna system, a synchronizing circuit, operatively coupled to the pilot channel receiver and the first transceiver that generates the first group of dedicated soft handoff channels, that provides at least pilot channel arrival time data; a first soft handoff controller operatively coupled to the synchronizing circuit and to a source base station, that communicates at least pilot channel arrival time data; (ii) a second transceiver collocated with the first transceiver, that generates the separate second group of spread spectrum traffic channels over a collocated antenna system wherein the second group of spread spectrum traffic channels includes the pilot channel received by the pilot channel receiver; and
wherein(b) the source base station includes a second soft handoff controller, operatively coupled to the first soft handoff controller, that generates dedicated soft handoff traffic channel control data for the first transceiver to facilitate selection of a desired dedicated soft handoff channel generated by the target base station. - View Dependent Claims (17, 18, 19)
-
Specification