Method for providing hand-offs in a frequency hopping communication system
First Claim
1. In a frequency hopping communication system wherein network control processors (NCPs) communicate with user devices by transmitting traffic channel information at each respective frequency within a plurality of frequencies, known as a hopping set, and for a period of time at each respective frequency, known as a dwell, each NCP having a different hopping set, a method for handing off user devices between NCPs comprising the steps of:
- establishing a set of synchronization frequencies for use by said NCPs;
informing the plurality of user devices of said synchronization frequencies;
assigning a single synchronization frequency from the set of synchronization frequencies to each respective NCP;
each NCP transmitting synchronization information at the assigned synchronization frequency during a portion of each dwell;
upon a determination that a user device handoff is necessary;
said user device tuning to the synchronization frequency employed by a different NCP and receiving transmitted synchronization information; and
said user device synchronizing its operation to the hopping set employed by the different NCP.
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Accused Products
Abstract
A method for handing off user devices (131-134) between network control processors (110, 120) in a frequency hopping communication system (100) includes establishing a set of synchronization frequencies (A-D) for use by said NCPs (110, 120), informing the plurality of user devices (131-134) of said synchronization frequencies (A-D) and assigning a synchronization frequency (A, B, C or D) to each respective NCP, each NCP transmitting synchronization information at its assigned synchronization frequency (A, B, C or D) during each hopping dwell (1-82). Upon a determination that a user device hand-off is necessary, said user device in question (133) tunes to a synchronization frequency (B) different from the synchronization frequency (A) employed by the currently serving NCP (110) and synchronizes its operation to the NCP (120) transmitting synchronization information on the tuned to synchronization frequency (B).
28 Citations
12 Claims
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1. In a frequency hopping communication system wherein network control processors (NCPs) communicate with user devices by transmitting traffic channel information at each respective frequency within a plurality of frequencies, known as a hopping set, and for a period of time at each respective frequency, known as a dwell, each NCP having a different hopping set, a method for handing off user devices between NCPs comprising the steps of:
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establishing a set of synchronization frequencies for use by said NCPs; informing the plurality of user devices of said synchronization frequencies; assigning a single synchronization frequency from the set of synchronization frequencies to each respective NCP; each NCP transmitting synchronization information at the assigned synchronization frequency during a portion of each dwell; upon a determination that a user device handoff is necessary; said user device tuning to the synchronization frequency employed by a different NCP and receiving transmitted synchronization information; and said user device synchronizing its operation to the hopping set employed by the different NCP. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification