Forward Link Overview
Last updated: October 28, 2004
The "Forward Link" refers to a radio link for the transmission of signals from the test set to a mobile station while the "Reverse Link" refers to a radio link for the transmission of signals from a mobile station to the test set.
This section summarizes the forward link channels supported by the test set in Active Cell operating mode and the key concepts relating to the forward link.
Forward Link Power
When Active Cell are selected in the Operation Mode field, the signals transmitted by the test set include:
-
Cell (Cell 1) Power: It is comprised of all of the enabled code channel power levels (
Forward Code Channels
). An Orthogonal Channel Noise Simulator (OCNS) which is used to simulate additional users on the forward link, is automatically enabled when the sum of the levels of all the enabled forward link physical channels is less than the cell power setting.
-
Cell 2 Power (
Lab Application only
, see
Configuring Cell 2 Used for Soft/Softer Handoff
)
-
AWGN Power: It can be summed into the forward link signal to simulate interference from other cells when enabled
The Cell 1 Power is combined with the Cell 2 Power and the AWGN Power, if enabled, to form the total RF power. See
Configuring Cell Power and AWGN Power Levels
for details.
Forward Code Channels
The forward link consists of a number of physical channels (identified by their walsh codes) which vary in IS-2000 system and IS-95 system. The test set allows you to control the individual code channels, such as the walsh code, power level, data rate, etc., see
Configuring Forward Channel Power Levels and Walsh Codes
for details.
Closed Loop Power Control
The test set also transmits the power control sub-channel which is used in conjunction with open loop power control to control power levels transmitted from the mobile station. See
Setting Reverse Closed Loop Power Control
for details.
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