TIA-136-332:2000 (R2013)

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TDMA – Third Generation Wireless – Packet Data Service – 136+ Medium Access Control

Published By	Publication Date	Number of Pages
TIA	2000	236

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Category: TIA

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Description

Introduction

This document specifies the Medium Access Control (MAC) Entity
for data transmission over a TIA 136 communications Packet Data
Channel (PDCH). A PDCH may be full rate, double rate or triple
rate. The MAC, Radio Resource Management Entity (RRME) [4] and
Broadcast Management Entity (BME) comprise the Radio Resource (RR)
sublayer in the General Packet Radio System-136 (GPRS-136) protocol
stack. The MAC entity supports two multiplexed MAC Logical Links
(MLL) of different priorities. The first MLL is assigned higher
priority and provides the higher layer and various management
entities with expedited data delivery services. The other MLL is
used for normal data transfer.

The MAC Entity is responsible for in-sequence delivery of normal
data and expedited data provided to it by the higher layer. Both
unacknowledged and acknowledged modes are supported on the
downlink. Acknowledged mode is supported on the uplink. In
acknowledged mode, error recovery is handled using a sliding window
ARQ protocol.

The MAC entity at the base station is responsible for active
mobile identity management (i.e., assignment and release of
temporary local identifiers for mobiles engaged in data
transmission or reception). These identifiers are used to carry out
acknowledgment and assignment functions for uplink transmissions
and to identify the recipient of data on the downlink. The base
station MAC entity also controls phase assignments (i.e., it can
order mobiles to look for uplink assignments and listen for
downlink transmissions on specific time slots).

On the uplink, both contention and reservation based access are
supported. Active Mobile Identity (AMI) values are used to provide
acknowledgments to contending users and to identify time slots as
contention slots or slots reserved for a specific mobile
station.

Each ARQ mode transaction starts with the transmission of a
BEGIN Protocol Data Unit (PDU) and proceeds with the transmission
of CONTINUE PDUs. The BEGIN handshake establishes the AMI for the
transaction and the mode of operation (i.e., fixed coding or
incremental redundancy) for the transfer of subsequent CONTINUE
PDUs. A variable number of blocks may be packed into each CONTINUE
PDU depending on the modulation. ARQ Status PDUs are used to
provide the peer transmission controller with knowledge about the
receiver state.

The MAC entity consists of a number of internal functional
entities to carry out the above functions. These entities exchange
information through a set of primitives. The functional entities
within the MAC entity are as follows:

MAC Logical Link Discriminator
Transmit buffer for each MLL.
Stuffer.
Frame Extractor
Broadcast Controller
Point to Multipoint Controller
Transmission Controller for each MLL:
The transmission controller consists of the following
functional entities:
Transmit Controller.
Receive Controller.
Router.
PDU Encoder for each MLL.
PDU Decoder for each MLL.
Incremental Redundancy Segment Encoder (for MLL1 only).
Incremental Redundancy Segment Decoder (for MLL1 only).
Channel Access Manager (CAM).
Sub-channel Controllers (SCCs).
MAC Layer Controller (MLC).

The types of signals defined within the MAC entity include the
following(detailed definitions are in Section 5):

MAC SDUs received from higher layer entities.
MAC Stuffed SDUs that add protocol identification and framing
to MAC SDUs.
MAC Data Segments used by Transmission Controllers as units of
data recovery.
MAC PDUs for communication between peer Transmission
Controllers.
Service primitives for providing service to the higher layer
and various management entities, for communicating between
functional entities within the MAC, and for obtaining service from
the physical layer.

Detailed PDU formats are provided for transfer of paging, data
and supervisory information on the downlink and data and
supervisory information on the uplink. Models for both mobile
station and base station operation are provided. Detailed diagrams
describing states, state variables and state transitions are
provided using Specification and Description Language (SDL).

Additional information