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;
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;
broadcasting the synchronization burst to the corresponding user terminal; and
determining a set of transmit spatial weights for a synchronization burst corresponding to a next user terminal of the 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 between the synchronization burst corresponding to the next user terminal and the one or more communication signals 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.
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Citations
33 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;
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;
broadcasting the synchronization burst to the corresponding user terminal; and
determining a set of transmit spatial weights for a synchronization burst corresponding to a next user terminal of the 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 between the synchronization burst corresponding to the next user terminal and the one or more communication signals is reduced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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;
reestablishing communication with a first user terminal of the plurality of user terminals over the corresponding SDMA channel;
transmitting a communication signal to the first user terminal over the corresponding SDMA channel;
determining a set of transmit spatial weights for a synchronization burst corresponding to one of the one or more remaining user terminals attempting to reestablish communication over a corresponding SDMA channel of a multi-access channel, the set of transmit spatial weights determined such that interference between the synchronization burst and the communication signal to the first user terminal is reduced; and
broadcasting the corresponding synchronization burst to the corresponding user terminal such that communication with the corresponding user terminal over the corresponding SDMA channel is reestablished. - View Dependent Claims (11, 12, 13, 14)
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15. 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 wherein the base station subsequently transmits a communication signal to the first user terminal over the corresponding SDMA channel, determines a set of transmit spatial weights for a synchronization burst corresponding to one of the one or more remaining user terminals attempting to reestablish communication over a corresponding SDMA channel of a multi-access channel, the set of transmit spatial weights determined such that interference between the synchronization burst and the communication signal to the first user terminal is reduced, and broadcasts the corresponding synchronization burst to the corresponding user terminal such that communication with the corresponding user terminal over the corresponding SDMA channel is reestablished. - View Dependent Claims (16, 17, 18, 19)
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20. 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;
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;
broadcasting the synchronization burst to the corresponding user terminal; and
determining a set of transmit spatial weights for a synchronization burst corresponding to a next user terminal of the 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 between the synchronization burst corresponding to the next user terminal and the one or more communication signals is reduced. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. 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;
reestablishing communication with a first user terminal of the plurality of user terminals over the corresponding SDMA channel;
transmitting a communication signal to the first user terminal over the corresponding SDMA channel;
determining a set of transmit spatial weights for a synchronization burst corresponding to one of the one or more remaining user terminals attempting to reestablish communication over a corresponding SDMA channel of a multi-access channel, the set of transmit spatial weights determined such that interference between the synchronization burst and the communication signal to the first user terminal is reduced; and
broadcasting the corresponding synchronization burst to the corresponding user terminal such that communication with the corresponding user terminal over the corresponding SDMA channel is reestablished. - View Dependent Claims (30, 31, 32, 33)
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Specification