TIA-136-335-1[E]:2011

Introduction

Management of the radio resources in a GPRS-136 packet-data
system is accomplished by means of the Radio Resource
Management procedures presented in this standard. Effective
management of the radio resources in a GPRS-136 system involves
activities in both the mobile station (MS) and the base
station (BS). The entities in a GPRS-136 mobile station and
base station that are used to achieve the goals of radio
resource management are the Radio Resource Management Entity
(RRME) and the Broadcast Management Entity (BME).

The functions of GPRS-136 Radio Resource Management are as
follows:

PCCH Selection:

To enable a GPRS-136 mobile station to acquire service on a
suitable GPRS-136 PCCH within an acceptable period, without the
need for any prior knowledge of the PCCHs in the system. This
goal is achieved by executing the Packet Control Channel
Selection procedure.

Load Balancing:

To evenly distribute the traffic load across one or more PCCHs.
When more than one PCCH is available for allocation in the cell,
the mobile stations operating in that cell must be evenly
distributed across the PCCHs. Furthermore, mobile stations that
camp on a particular PCCH must be allocated paging subchannels in
such a manner that the paging load is evenly distributed across all
available paging time slots on the PCCH. This goal of load sharing
is achieved by executing the Packet Control Channel
Allocation procedure.

PCCH Reselection:

To provide service continuity to a GPRS-136 mobile station,
operating on a PCCH or PTCH through reselection to the best
available PCCH. This goal is achieved by executing the Packet
Control Channel Reselection procedure.

PCCH/PTCH Assignment:

To provide the capability for the network to reassign an active
mobile station to a different PCCH or PTCH within the same cell.
This goal is achieved by executing the Channel Assignment
procedures.

Power Control:

To provide the capability to control the uplink power of the
mobile stations and the downlink power of the base stations.

To achieve the preceding goals, the RRME and BME must interact
with other entities in the mobile station and the base station.
RRME and BME interact with the physical layer for obtaining radio
channel parameters such as signal strength. RRME and BME
also interact with the MAC layer and the GPRS-136 Mobility
Management layer. The BME entity within the base station
interacts with the BME entity within the mobile station through the
use of BME related messages broadcast on the F-PBCCH and E-PBCCH
subchannels (see TIA/EIA-136-336 [11]). The RRME entity within the
base station interacts with the RRME entity within the Mobile
Station through the use of point-to-point RRME messages.