Chapter 4 Main Functions; Power Control And Rate Control - Huawei Airbridge BTS3606A Technical Manual

Technical Manual
Airbridge BTS3606A CDMA Base Station
The BTS3606A supports the following CDMA2000 1x standards:
The Um interface supports the TIA/EIA IS -2000 Rel.A standard and is compatible
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with the TIA/EIA-95-A/B standard.
The
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requirements.
The BTS3606A supports the following 1xEV-DO standards:
The Um interface supports the C.S0024-0 standard.
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The minimum performance of the BTS3606A satisfies C.S0032-0 requirements.
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4.1 Power Control and Rate Control

The CDMA system is a self-interference system. Every subscriber is an interference
source to other subscribers. If it is possible to ensure that every MS transmits at the
minimum power it needs, the whole system capacity can reach the maximum.
Therefore, power control directly affects the system capacity and the service quality.
Operating in the CDMA2000 1x system, the BTS3606A adopts power control
mechanism. Power control is classified into forward power control and reverse power
control. Forward power control is used to control the transmit power of the BTS.
Reverse power control aims to control the transmit power of the MS.
Operating in the 1xEV-DO system, the BTS3606A adopts rate control in the forward
direction, and the rate control plus power control in the reverse direction.
I. Forward power control
There are several methods to realize forward power control, depending on the MS
protocol version and the system parameters.
Power control based on PMRM
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When the MS uses the Power Measurement Report Message (PMRM) for power
control, it determines the method and frequency of reporting PMRM according to
the received control message contained in the system parameter message.
Power control based on EIB
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When the MS uses the Erasure Indicator Bit (EIB) for power control, it detects
forward frame quality and sends this information to the BTS using EIB. The BTS
will adjust the transmit power according to the EIB information.
Forward fast power control
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The MS adjusts the BTS power according to the power control bit. The power
control bit can be transmitted at a maximum speed of 800 bps.

Chapter 4 Main Functions

minimum performance of the BTS3606A
4-1
System Description
Chapter 4 Main Functions
satisfies TIA/EIA-97-D