Dedicated control channel handoff in CDMA communication system
AssigneeSamsung Electronics Co., Ltd.
InventorsDae-Gyun Kim, Chang-Hoi Koo
Life of this patent
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Abstract
A handoff method in a CDMA communication system using Walsh codes and quasi-orthogonal codes. To implement a handoff, a new base station to which a call is switched notifies a serving base station of an available quasi-orthogonal code, if the new base station has no available Walsh codes. The serving base station transmits a handoff direction message to a mobile station and the mobile station communicate with the new base station using the quasi-orthogonal code included in the handoff direction message.
Claims12
A handoff method between a serving base station and a new base station during a call between the serving base station and a mobile station using a given orthogonal code in a CDMA communication system, comprising the steps of:
- notifying the serving base station of an available quasi-orthogonal code, said serving base station notification done by the new base station;
- notifying the mobile station of the available quasi-orthogonal code, said mobile station notification done by the serving base station;
- and
- communicating with the new base station using the available quasi-orthogonal code by the mobile station when a handoff occurs.
A handoff method for a mobile station in a CDMA communication system, which generates a Walsh code and a quasi-orthogonal code and receives a handoff direction message from a serving base station, comprising the steps of:
- determining whether a quasi-orthogonal code is set in an orthogonal code assignment field of the handoff direction message;
- and
- communicating with a new base station to which a call is switched using the quasi-orthogonal code during handoff, if the quasi-orthogonal code is set in the orthogonal code assignment field in the handoff direction message.
A handoff method for a mobile station which receives a handoff direction message from a serving base station, comprising the steps of:
- determining whether a quasi-orthogonal code mask ID is set in the handoff direction message;
- and
- communicating with a new base station to which a call is handed off using the quasi-orthogonal code mask ID, if the quasi-orthogonal code mask ID is set in the handoff direction message.
Dependencies are inferred from the claim text.