User Manual

RPC/RP Manual RP Installation
19June2000 WLL-RPC/RP-IN/UM-1.0
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Figure 3-6: Radio Channel Structure
The radio frequency allocation shown in Figure 3-6 displays a typical radio
channel structure when three cordless handsets are operating through a single RP.
RCR STD-28 does not designate a control channel prior to the operation. Instead,
it assigns the control slot to any one of the four available slots.
Traffic channels are not preassigned. Channel assignment is performed by a
distributed-autonomous dynamic channel assignment scheme and is an essential
function of the WLL radio system. Channel assignment for new communication
is selected from the available channel resources mapped in a two-dimensional
frequency-time matrix renewed by the result of checking signal strength when the
call is established. The RP also completes handling of the signaling process over
the radio segment.
Due to the separation of the traffic and control channels, traffic channels can be
allocated in a distributed and autonomous manner by employing the switching
TDMA mechanism. In order to maximize the benefit of carrier switching TDMA,
the RP uses a system that synchronizes radio frames by superimposing
synchronization data on the B interface. The result of this synchronization is an
improved utilization of frequency as compared to asynchronous systems.
In addition, with TDMA-TDD and the diversity of the RP transmission and
reception, it is not necessary to install the multiple antenna or receiver-branch
diversity mechanisms in the PS handsets to improve the data communication