Moby Dick Consolidated System Integration Plan

D0103v1.doc Version 1 6.7.2003
4.3.1.5 Radio Convergence Function (RCF)
This module will act as a specific TD-CDMA driver, giving a low level interface to manage the
connections and the associated data channels; to send and receive IP packets and other specific radio data;
and get some feedback on the TD-CDMA conditions.
It will be implemented as a kernel module (RCM and RCF will be grouped in a same kernel module,
namely a driver).
The behaviour of the different sub-blocks of the RCF will be detailed in the next chapter.
4.3.1.6 Access Stratum
The Access Stratum provides services related to the transmission of data over the radio interface and the
management of the radio interface.
It includes the following Radio Interface protocols: the Physical layer, the data link layer, divided into 2
sub-layers: Medium Access Control (MAC) and Radio Link Control (RLC). In the user-plane, an
additional service dependant protocol exists: the Packet Data Convergence Protocol (PDCP). The lowest
sub-layer of the network layer consists of one protocol, called Radio Resource Control (RRC), which
belongs to the control plane.
The behaviour of the different sub-blocks of the Access Stratum will be detailed in the next chapter.
The following chapters give a detailed description of the sub-blocks of each component, and their
interactions with other components.
4.3.1.7 Inter Working Function
IWF
IP to TD-CDMA relay
TD-CDMA
to IP relay
QoS
Attendant
Router
Advertisement
proxy
Neighbor
Discovery
proxy
Info
Management
Other IP signaling
+ IP data
proxy
Paging
proxy
Figure 57: Inter Working Function
The IWF has interactions with the RCM (generic part of the TD-CDMA driver), the IP stack and the
Ethernet driver. It is split into the following sub-blocks.
4.3.1.8 Info Management block
In the initialisation phase, it will retrieve the list of IP addresses of the Access Routers (linked to the
neighbouring Radio Gateways) from a static configuration file, and a request will be sent to the
Broadcasting sub-block of the RCM, to broadcast this information on the radio. The message will be
IWF_BROADCAST_REQUEST, with the list as parameter.
It will store the Router Advertisement currently broadcasted on the radio, for the Mobile Terminals. It
will store a list with the local connection reference of every Mobile Terminal currently connected to the
Radio Gateway, the associated Home Address and Care Of Address of the MT, and the IMEI of the MT.
Upon reception of the message OPEN_TD-CDMA_CONN_IND, with parameter local connection
reference and IMEI of MT, the corresponding entry will be added to the list.
Upon reception of the message TD-CDMA_CONN_INFO, with parameters local connection reference,
associated Home Address and Care Of Address, the corresponding entry in the list will be updated.
Upon reception of the messages CLOSE_TD-CDMA_CONN_IND or LOST_TD-CDMA_CONN_IND,
with parameter local connection reference, the corresponding entry will be deleted from the list.
4.3.1.9 IP to TD-CDMA relay block
The following schema details the Info Management Block and the sub-blocks presented in the next 3
chapters.
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