Hard handoff procedure for dedicated and high speed shared channels
DC CAFCFirst Claim
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1. A method of communicating between a mobile station, a serving base station and a target base station comprising:
- establishing a new link between the target base station and the mobile station before releasing an existing link between the mobile station and the serving base station while having only the existing link in an active set for the mobile station before releasing the existing link by(A) determining if a handoff is desired between the serving base station and the target base station;
(B) initiating the new link between the mobile station and the target base station;
(C) transmitting an active set update message to the mobile station using the existing link between the serving base station and the mobile station;
(D) achieving uplink synchronization for the target base station to communicate with the mobile station;
(E) receiving at least one signal over the new link indicating that the mobile station has processed the transmitted active set update message; and
(F) releasing the existing link responsive to the at least one signal of step (E).
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Abstract
A wireless communication network (20) utilizes a hard handoff procedure for switching between cells serving a mobile station (40). In a disclosed example, the existing link between the mobile station (40) and a serving base station (38) is not released until a new link between a target base station (32) and a mobile station (40) is established. At the same time, however, the mobile station maintains only one base station or link within its active set at all times. The disclosed example is useful for dedicated channel and shared channel communications in CDMA systems, for example.
11 Citations
15 Claims
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1. A method of communicating between a mobile station, a serving base station and a target base station comprising:
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establishing a new link between the target base station and the mobile station before releasing an existing link between the mobile station and the serving base station while having only the existing link in an active set for the mobile station before releasing the existing link by (A) determining if a handoff is desired between the serving base station and the target base station; (B) initiating the new link between the mobile station and the target base station; (C) transmitting an active set update message to the mobile station using the existing link between the serving base station and the mobile station; (D) achieving uplink synchronization for the target base station to communicate with the mobile station; (E) receiving at least one signal over the new link indicating that the mobile station has processed the transmitted active set update message; and (F) releasing the existing link responsive to the at least one signal of step (E). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification