Moby Dick Consolidated System Integration Plan

D0103v1.doc Version 1 6.7.2003
4.3.2 Radio Channel Manager
RCM
Radio
Connection Manager
Broad
casting
Paging
Open /
Close
Conn
Packet Transmission
Control
Data
Packet
Packet
Packet Reception
Control
Data
Packet
Packet
Figure 62: Radio Channel Manager
The Radio Channel Manager is the generic part of the Radio driver. It provides a generic interface to the
IWF and to the IP stack. It provides also a generic interface to the lower layer of the Radio driver: the
Radio Convergence Function.
4.3.2.1 Radio Connection Manager block
• Broadcasting sub-block
It will transmit the broadcast requests from the IWF, message IWF_BROADCAST_REQ, directly to the
Broadcasting sub-block of the RCF.
• Paging sub-block
It will transmit the paging requests from the IWF, message IWF_PAGING_REQ, directly to the Paging
sub-block of the RCF.
• Open / Close connection sub-block
The Open / Close Connection sub-block manages the Radio Connections with Mobile Terminal.
The connections are always opened on the initiative of the Mobile Terminal.
When the Open / Close Connection sub-block of the RCF opens a connection, it will transmit the message
OPEN_TD-CDMA_CONN_IND, to the Open / Close Connection sub-block of the RCM, which will
transmit it to the Info Management block of the IWF. There will be two parameters: local connection
reference and IMEI of MT.
When a connection has been opened, the RCF of the MT sends a NAS signalling message to the RCF of
the RG (NAS_CONNECTION_INFO), with the parameters: Home Address and CoA of MT. This
information is passed to the Open / Close Connection sub-block of the RCM, with the associated local
connection reference, via message OPEN_TD-CDMA_CONN_INFO.
Then this message OPEN_TD-CDMA_CONN_INFO is forwarded to the Info Management block of the
IWF, with the parameters: local connection reference, Home Address and CoA of MT.
The association “local connection reference / Mobile Terminal Care Of Address” is important for IP
packets received from the Access Router, to be transmitted to a Mobile Terminal: a match is searched
between the destination address of the IP packet and the list of Care Of Address, and the associated
connection reference is used to send the packet on the proper radio bearer to the Mobile Terminal.
The connections are always closed on the initiative of the Mobile Terminal.
When the Open / Close Connection sub-block of the RCF closes a connection, it will transmit the
message CLOSE_TD-CDMA_CONN_IND, to the Open / Close Connection sub-block of the RCM, which
will forward it to the Info Management block of the IWF. There will be one parameter: local connection
reference.
When the Open / Close Connection sub-block of the RCF detects a connection loss, it will transmit the
message LOST_TD-CDMA_CONN_IND, to the Open / Close Connection sub-block of the RCM, which
will forward it to the Info Management block of the IWF. There will be one parameter: local connection
reference.
4.3.2.2 Packet Transmission block
The connection must have been opened by the Radio Connection Manager sub-block, before any IP
packet can be transmitted (if it’s not the case, they will be dropped: this can only happen with packet
arriving from the Access Router, and there is nothing we can do if the MT has not opened the connection
yet). An open connection means that the RCF has also established all the associated radio control
channels, but that no radio bearer has been pre-established.
In case of connection loss, we do nothing on the Radio Gateway side (the IP packets from the Access
Router to the Mobile Terminal will be lost). The connection loss will be detected on the Mobile Terminal
side too, and a new connection will be established on its initiative, if appropriate.
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