TIA/EIA-732-402:2001

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Cellular Digital Packet Data (CDPD) System Specification Medium Access Control

Published By	Publication Date	Number of Pages
TIA	2001	62

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Description

Introduction

This Part defines the services, procedures and encoding required
to provide the Medium Access Control (MAC) layer of the Airlink
Interface between the Mobile Data Base Station (MDBS) and Mobile
End Systems (M-ESs).

The MAC layer defines a protocol that operates within the Data
Link Layer of the OSI reference architecture. In the specification
of the CDPD Airlink Interface, the Data Link Layer is separated
into two distinct sublayers defined by their functions:

• Logical link control functions

Logical link control provides services for information transfer
over logical data link connections between the CDPD Network and
M-ESs, including functions for addressing, sequence control, error
recovery and flow control. It is provided by the Mobile Data Link
Protocol (MDLP) defined in Part 403.

• Medium access control functions

Medium access control functions arbitrate access to the shared
medium between M-ESs and an MDBS. The MAC layer also provides frame
recognition, delimiting and error detection/correction. It is
provided by the procedures and encoding defined in this Part.

The logical link control sublayer and MAC sublayer together
encompass the functions of the Data Link Layer as defined in the
OSI model.

In the remainder of this specification, the term Data
Link Layer is used to refer to the MDLP protocol entity. It is
understood that this term refers to the logical link control
sublayer provided by MDLP, as distinct from the MAC sublayer
defined in this Part.

The definition of the MAC layer takes into consideration the
concepts and principles of the following:

a. [ISO-7498]—The reference model and layer service conventions
for OSI

b. [IEEE-802]—Local area network—Overview and architecture

c. [ISO-8802-3]—Local area network—Carrier sense multiple access
with collision detection

d. [ISO-10039]—Medium access control service definition.

Additional information