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User Manual
iSiteC BTS3601C CDMA Base Station
V. Layer 3
The higher layer signaling performs the functions such as radio resource
management, mobility management and call connection management on air
interface.
1)
Radio resource management
The radio resource management functions include:
Radio channel management
l
It is used to establish, operate and release radio channels, and help to realize soft
handoff, softer handoff and hard handoff.
Power control
l
Various power control technologies are used on Um interface to reduce the system
interference and improve the system capacity.
2)
Mobility management
It is used to support the mobility features of the mobile subscriber, performing such
functions as registration, authentication and Temporary Mobile Subscriber Identity
(TMSI) re-allocation.
3)
Connection management
It is used to setup, maintain and terminate calls.
1.4.2 Abis Interface
I. Overview
Abis interface is defined as the interface between BSC and BTS, the two functional
entities in the Base Station Subsystem (BSS). It is the interface defined for BTS
accessing BSC via the terrestrial link.
1)
Structure of Abis interface
Abis interface consists of three parts: Abis traffic, Abis signaling and OML signaling,
as shown in Figure 1-4.
Abis traffic is the interface connecting SDU of BSC and the CEs of BTS. It is used to
bear user traffic.
Abis signaling is the interface connecting SPU of BSC and the MC of BTS, It is used
to control the cell setup, transmission of messages over paging channels and access
channels, and call setup & release.
OML signaling is used to perform operation and maintenance. It is defined by
equipment manufacturers. On Abis interface, there is a transparent channel used to
bear OML between OMC and OMU of BTS.
1-11
System Description
Chapter 1 System Overview
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