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Airbridge cBTS3612 CDMA Base Station
4.6.2 Interface Management
I. Abis interface management
Abis interface management
management of Abis interface transmission links (including E1/optical link, ATM link
and TCP/IP link). The ATM link setup procedure is first originated through a default
OML PVC. After the IP address is obtained through BOOTP flow, TCP link setup
procedure is activated to complete the setup of OML link. The allocation of PVP,
PVC, TCP/IP links (including signaling channel and traffic channel) are allocated
through Abis interface management procedure, which is a part of BTS configuration.
Setting up signaling channel is to allocate ATM (bearing AAL5 link) transmission
path (i.e. allocate VPI and VCI) and IP address on Abis interface of the signaling
channel, and complete the connection of transmission paths.
Setting up traffic channel is to allocate ATM (bearing AAL2 link) transmission path
(i.e. distributing VPI, VCI) on Abis interface of the traffic channel and switch the
traffic to internal link transmission path to complete the connection of transmission
paths. Actually, AAL2 link is set up and released dynamically.
Disconnection of traffic channel is the disconnection of ATM transmission path on
Abis interface. When BTS configuration changes, Abis configuration can be
changed or this function may be used for maintenance.
II. Air interface management
Main function of the logic part of air interface management is fulfilled by logic
operation & maintenance part. The air interface management involves some O&M
functions related to implementing radio communication, including configuration of
BTS transceiver attributes and channel attributes configuration.
BTS transceiver attributes include parameters such as CSM chip parameter,
physical channel transmit format, sector bypass, sector delay, antenna connection
status, and transmit diversity (OTD) selection. The configuration of BTS transceiver
attributes is activated by OMC through sending configuration message. The result of
the operation is that attributes of the corresponding BTS objects are set to specified
status.
Channel attributes are the driving parameters of t h e channel element, including
channel type and channel gain. Channel attributes configuration is activated by
OMC through sending configuration message. The result of the operation is that
attributes of the corresponding BTS objects are set to specified status.
procedure includes the allocation, setup and
4-23
System Description
4 System Function
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