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4.2.1 Soft Handoff
The soft handoff occurs between neighbor cells that operate on the same frequency
and belong to different BTSs. The two BTSs can belong to the same BSC, or two
different BSCs connected with each other with A3/A7 interface.
In the soft handoff procedure, the MS maintains the connection with the previous cell till
it establishes the communication with the new cell. The MS can not only establish radio
links with multiple cells, but also select and combine the data received from these links
to improve conversation quality and reduce call drops.
4.2.2 Softer Handoff
The softer handoff occurs between neighbor sectors that operate on the same
frequency and belong to the same BTS. It is a special case of soft handoff.
As the MS establishes radio links with multiple sectors under the same BTS, the BTS
can combine the diversity signals received by these sectors. Therefore, the
conversation quality during softer handoff is better than that of soft handoff.
4.2.3 Hard Handoff
In the hard handoff procedure, the MS first terminates the connection with the previous
cell, and then sets up the connection with the new cell. Therefore, call drops may occur.
The hard handoff includes:
Intra-frequency hard handoff: handoff between the BSCs without A3/A7 interface
in-between
Inter-frequency hard handoff: handoff between cells operating on different
frequencies
4.3 Radio Configuration
The Um interface of the RRU3606 supports CDMA2000 1X and CDMA2000 1xEV-DO
networks. The spreading rate is 1.2288 Mcps.
The CDMA2000 1X physical layer supports multiple radio configurations (RCs).
Different RCs support the frames of the different rate sets, and feature different channel
configurations and spread spectrum structures.
The radio configuration combinations supported by the RRU3606 are as follows:
Forward RC1 and reverse RC1
Forward RC2 and reverse RC2
Forward RC3 or RC4, and reverse RC3
Forward RC5 and reverse RC4
Commercial in Confidence
RRU3606 CDMA Base Station Product Description
Page 17 of 43
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