Table of Contents
Advertisement
User Manual
Airbridge cBTS3612 CDMA Base Station
Support multi-media service, i.e. processing voices, packet data and circuit
l
data of different QoS levels at the same time.
1) MAC sublayer
To support data service and multi-media service, cdma2000 1X provides powerful
MAC layer to ensure the reliability of services. MAC layer provides two important
functions:
Radio Link Protocol (RLP ), ensuring reliable transmission on the radio link.
l
Multiplex function and QoS function, with diversified services and higher service
l
quality.
2) LAC sublayer
LAC layer performs such functions as Automatic Repeat Request (ARQ),
authentication and addressing.
V. Layer 3
The higher layer signaling performs the functions such as radio resource
management, mobility management and call control management on air interface.
1) Radio resource management
It is mainly used to establish, operate and release radio channels, and help to
realize soft handoff, softer handoff and hard handoff.
2) Mobility management
It is mainly used to support the mobility features of the mobile user, performing such
functions as registration, authentication and Temporary Mobile Subscriber Identifier
(TMSI) re-allocation.
3) Connection management
It is mainly used to setup, maintain and terminate calls.
VI. Power control
Um interface utilizes power control technology to reduce the system interference
and improve the system capacity. There are forward power control and reverse
power control available.
1) Forward power control supports closed-loop power control
Forward power control includes power control based on power measurement report,
control based on EIB, and quick forward power control.
Forward closed-loop power control means that MS checks the quality of received
frames and received power, makes judgment and sends request to BTS for
1-13
System Description
1 System Overview
Advertisement
Table of Contents
