Fast acquisition of traffic channels for a highly variable data rate reverse link of a CDMA wireless communication system
First Claim
1. A method for communication of data between a base station and multiple subscriber units over one or more CDMA communication channels, the method comprising the steps of:
- providing a plurality of subchannels within each of at least one CDMA channel;
defining at least one timeslot within the subchannels, each timeslot corresponding to a particular subscriber unit;
assigning subchannels for communication between the base station and subscriber units on an as-needed basis; and
maintaining a synchronizing idle mode connection between at least one subscriber unit and the base station.
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Accused Products
Abstract
A service option overlay for a CDMA wireless communication in which multiple allocatable subchannels are defined on a reverse link by assigning different code phases of a given long pseudonoise (PN) code to each subchannel. The instantaneous bandwidth needs of each on-line subscriber unit are then met by dynamically allocating none, one, or multiple subchannels on an as needed basis for each network layer connection. The system efficiently provides a relatively large number of virtual physical connections between the subscriber units and the base stations on the reverse link for extended idle periods such as when computers connected to the subscriber units are powered on, but not presently actively sending or receiving data. These maintenance subchannels permit the base station and the subscriber units to remain in phase and time synchronism. This in turn allows fast acquisition of additional subchannels as needed by allocating new code phase subchannels. Preferably, the code phases of the new channels are assigned according to a predetermined code phase relationship with respect to the code phase of the corresponding maintenance subchannel.
99 Citations
34 Claims
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1. A method for communication of data between a base station and multiple subscriber units over one or more CDMA communication channels, the method comprising the steps of:
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providing a plurality of subchannels within each of at least one CDMA channel;
defining at least one timeslot within the subchannels, each timeslot corresponding to a particular subscriber unit;
assigning subchannels for communication between the base station and subscriber units on an as-needed basis; and
maintaining a synchronizing idle mode connection between at least one subscriber unit and the base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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14. A method for managing data transmissions between a base station and a plurality of field units in a wireless CDMA communication system comprising the steps of:
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reserving at least one channel having an estimated bandwidth for wireless communications;
dividing the at least one channel to include multiple data channels, each data channel having a bandwidth that is less than the estimated bandwidth;
assigning the data channels among selected field units for data transmissions between the field units and base station; and
maintaining synchronization between the base station and field units not assigned data channels, the synchronization further comprising defining a timeslot within a subchannel corresponding to a particular subscriber unit.
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23. A method of supporting variable rate data transfers on communication links between a base station and each of a plurality of field units in a wireless CDMA communication system, the method comprising the steps of:
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estimating a maximum bandwidth of at least one channel based on an acceptable bit error rate, wherein an available bandwidth is determined;
dividing the available bandwidth for data transfers on the communication links, wherein a greater portion of available bandwidth is assigned to links requiring higher data transfer rates; and
allocating a portion of the available bandwidth for synchronizing links between the base station and subscriber units not actively transmitting data, the synchronization links further defined by timeslots, each timeslot corresponding to a particular field unit.
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Specification