31-07-2013, 04:29 PM
WCDMA Radio Network Planning and Optimization
WCDMA Radio.ppt (Size: 2.63 MB / Downloads: 37)
WCDMA Fundamentals
WCDMA network infrastructure
WCDMA radio interface protocol architecture
WCDMA link level characteristics & indicators
WCDMA link budget analysis
RADIO RESOURCE UTILIZATION---PC and SHO conclusion
Bonding of SHO and PC(based on the fact that SHO gain is dependent on the PC efficiency)
SHO gain depends on the type of channel and the degree of PC imperfection.It is usually higher with imperfect PC.
SHO diversity can reduce the PC headroom,thus improving the coverage.
The transmit and receive power differences as a result of SHO measurement errors and SHO windows can affect the PC error rate in uplink,reducing the uplink SHO gains.
In uplink, SHO gain is translated into a decrease in the outer-loop PC’s Eb/No target.
RADIO RESOURCE UTILIZATION---Code Planning
Code allocation
Scrambling and spreading code allocation for uplink(by UTRAN)
Scrambling and spreading code allocation for downlink
Downlink channelization code allocation (by UTRAN)
Downlink scrambling code planning
512 scrambling codes subdivided into 64 groups each of eight codes
Co-existing TDD & FDD modes
UTRA TDD
Advantage in the unpaired spectrum operation
Better utilized for asymmetric service at high data rate
Can build stand-alone wide-area TDD network(?) or serve as a separate capacity-enhancing layer in the network
Lower Max. Path loss compared with FDD scenario
Lower “cell breathing” and thus more stable service coverage
Requires strict synchronization especially in uplink
Low-rate services often goes to code-limited cases while high-rate services goes to interference-limited cases