TD-SCDMA Key technologies
Time Division Multiple Access
(TDMA) in combination with Time Division Duplex (TDD) significantly
improves your network performance by allowing your radio resources
to process network traffic in both directions, per uplink and
downlink. TDMA uses a 5 ms frame for repetitive transmissions.
This frame is subdivided into 7 time slots, which can be flexibly
assigned to either several users or to a single user who may
require multiple timeslots.
TDD principles permit traffic
to be up linked (from the mobile terminal to the base station)
and down inked (from the base station to the mobile terminal)
using the same frame and different time slots. For asymmetric
services used with Internet access, where high data volumes
are transmitted from the base station to the terminal, more
time slots are used for the downlink than the uplink.
For symmetric services used
during telephone calls, where the same amount of data is transmitted
in both directions, the time slots are split equally between
the downlink and uplink. This capability of adapting the uplink/downlink
format according to the data loads within a single frequency
band increases the overall capacity of the air interface. Thus
making TDMA/TDD operations ideal for your 3G services.
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