【資料名稱】：GPRS EGPRS Channel Administration

【資料作者】：Ericsson

【資料日期】：2004

【資料語言】：英文

【資料格式】：PDF

【資料目錄和簡介】：

GPRS/EGPRS packet data sessions are scheduled over the air interface as
Temporary Block Flows (TBFs). When a TBF shall be set up in order to support
a certain service for a mobile user, transmission resources will be reserved on
one or more Packet Data Channels (PDCHs). The PDCHs can have different
capabilities. They may support only the low speed coding schemes CS-1 to
CS-2, which will only require 16 kbits/s Abis connections per timeslot, or also
CS-3 to CS-4 and/or EGPRS which will require 64 kbits/s Abis per timeslot.
The PDCH reservation will be made taking into account the Mobile Station’s
(MS) capabilities (Multislot Class, and support for EGPRS). PDCHs are chosen
for the reservations also in accordance with the requested Quality of Service)
(QoS) Class for the service. The QoS attributes are negotiated with the Core
Network (the node SGSN).
To be able to reserve GPRS/EGPRS channels for an MS, they must first be
allocated as PDCHs. PDCHs may be fixed allocated as dedicated PDCHs
or they may be allocated temporary as on-demand PDCHs. The allocation
of dedicated PDCHs will be made by the system according to operator
request (ordered number of dedicated PDCHs). On-demand PDCHs will be
automatically allocated by the system when more resources for Packet Data
traffic are needed. PDCHs will be allocated according to certain rules (best
channels are allocated first).
Several other features impact on the GPRS/EGPRS Channel Administration
feature see references to other User Descriptions Section 7 References on
page 29.