Methods for reliable user switchback on a PHS spatial division multiple access channel
First Claim
Patent Images
1. A method comprising:
- transmitting a communication signal over each of one or more spatial division multiple access (SDMA) channels of a multi-access channel to one or more corresponding user terminals; and
determining a set of transmit spatial weights for a synchronization burst corresponding to one of one or more user terminals attempting to reestablish communication over an SDMA channel of the multi-access channel, the set of transmit spatial weights determined such that interference caused by one or more communication signals to the synchronization burst is reduced.
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Abstract
An embodiment of the invention provides a method for effecting switchback on a spatial division multiple access (SDMA) PHS channel. A communication signal is broadcast over each of one or more SDMA channels of a multi-access channel to one or more corresponding user terminals. A set of transmit spatial weights is determined for a synchronization burst to a user terminal attempting to reestablish communication over an SDMA channel of the multi-access channel. The set of transmit spatial weights is determined such that interference caused by one or more communication signals to the synchronization burst is reduced.
17 Citations
43 Claims
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1. A method comprising:
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transmitting a communication signal over each of one or more spatial division multiple access (SDMA) channels of a multi-access channel to one or more corresponding user terminals; and
determining a set of transmit spatial weights for a synchronization burst corresponding to one of one or more user terminals attempting to reestablish communication over an SDMA channel of the multi-access channel, the set of transmit spatial weights determined such that interference caused by one or more communication signals to the synchronization burst is reduced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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alternately broadcasting each of a set of synchronization bursts, each synchronization burst corresponding to one of a plurality of user terminals attempting to reestablish communication over respective corresponding SDMA channels of a multi-access channel; and
reestablishing communication with a first user terminal of the plurality of user terminals over the corresponding SDMA channel. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A wireless communication system comprising:
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a mobile switching center; and
a plurality of base stations coupled to the mobile switching center, each base station servicing a plurality of user terminals wherein a base station transmits a communication signal over each of one or more SDMA channels of a multi-access channel to one or more corresponding user terminals, and determines a set of transmit spatial weights for a synchronization burst corresponding to one of one or more user terminals attempting to reestablish communication over an SDMA channel of the multi-access channel, the set of transmit spatial weights determined such that interference caused by one or more communication signals to the synchronization burst is reduced. - View Dependent Claims (18, 19, 20, 21)
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22. A wireless communication system comprising:
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a mobile switching center; and
a plurality of base stations coupled to the mobile switching center, each base station servicing a plurality of user terminals wherein a base station alternately broadcasts each of a set of synchronization bursts, each synchronization burst corresponding to one of a plurality of user terminals attempting to reestablish communication over respective corresponding SDMA channels of a multi-access channel, and reestablishes communication with a first user terminal of the plurality of user terminals over the corresponding SDMA channel. - View Dependent Claims (23, 24, 25, 26, 27, 31, 32)
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28. A machine-readable medium having one or more executable instructions stored thereon, which when executed by a digital processing system cause the digital processing system to perform a method, the method comprising:
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transmitting a communication signal over each of one or more SDMA channels of a multi-access channel to one or more corresponding user terminals; and
determining a set of transmit spatial weights for a synchronization burst corresponding to one of one or more user terminals attempting to reestablish communication over an SDMA channel of the multi-access channel, the set of transmit spatial weights determined such that interference caused by one or more communication signals to the synchronization burst is reduced. - View Dependent Claims (29, 30, 33, 34, 35, 36, 37)
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38. A machine-readable medium having one or more executable instructions stored thereon, which when executed by a digital processing system cause the digital processing system to perform a method, the method comprising:
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alternately broadcasting each of a set of synchronization bursts, each synchronization burst corresponding to one of a plurality of user terminals attempting to reestablish communication over respective corresponding SDMA channels of a multi-access channel; and
reestablishing communication with a first user terminal of the plurality of user terminals over the corresponding SDMA channel. - View Dependent Claims (39, 40, 41, 42, 43)
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Specification