scope:

The present document applies to the HIPERACCESS air-interface with the specifications of layer 2 (Data Link Control (DLC) layer) following the ISO-OSI model. HIPERACCESS is confined to only the radio subsystem consisting of the physical (PHY) layer and the DLC layer, which are both core network independent, and the core network specific convergence sublayer.

The DLC layer contains functions and protocols for:

• Radio link control (RLC) for managing the resources of both directions of the radio link between AP and AT, including:

- Initialization Control (IC), for managing the access of a terminal to the HIPERACCESS system;

- Radio Resource Control (RRC), for managing adaptive PHY mode operation, adaptive power control, load levelling, etc.;

- Connection Control (CC), for managing the setup and the quality of connections;

- Security Control (SC), for managing privacy of traffic data and terminal authentication.

• Medium Access Control (MAC) for managing the access to the shared radio resource, including Resource Grant Control (RGC) and the control of the frame structure.

• The interworking with layers at the top of the radio subsystem is handled by convergence layers above the DLC layer. The scope of the present document is as follows:

- it gives a description of the basic data transport functions of the DLC layer of HIPERACCESS systems;

- it specifies the protocols (including all messages and their formats) in full detail in order to allow interoperability between equipment developed by different manufacturers.

For the purpose of interoperability and completeness the present document includes the detailed specification of the normal and exceptional behaviour. ASN.1 is used for the description of the content of all protocol primitives (normative) and service primitives (informative), a graphical view of the message flow over interfaces is provided by the use of MSCs (informative) and HMSCs (informative) and the protocol and system behaviour is extensively specified in SDL (normative). The present document does not address the requirements and technical characteristics for conformance testing. These are covered in separate deliverables.