FAST ACQUISITION OF TRAFFIC CHANNELS FOR A HIGHLY VARIABLE DATA RATE

摘要

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.