Moby Dick Consolidated System Integration Plan

D0103v1.doc Version 1 6.7.2003
4.1.2.3.4 Paging
There is no specific entity in the RCM module to handle paging. The paging entity in the RCF directly
transmits the IP paging packets to the Control Packet sub-block, of the Packet Reception block, of the
RCM. These IP paging packets will be passed to the IPv6 stack, and will automatically reach the Paging
module.
Enhanced IPv6 stack
RCM
Radio
Connection Manager
Radio
Infos
Open /
Close
Packet Transmission
Control Data
Packet Packet
Packet Reception
Control Data
Packet Packet
Conn
RCF
TD-cdma
Infos
TDCDMA
Connection Manager
Open /
Close
Conn
Paging
Control Channel Mngt
Send /
Receive
Data
Data Channel Mngt
Open /
Close
Data
Chanels
Send /
Receive
Data
AS
4.1.2.3.5 Packet Transmission block
Figure 13: 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, but this should never happen as the
TD-CDMA driver is “linked” to the IP stack only when the radio connection is established). An open
connection means that the Access Stratum has established all the associated radio control channels, but
that no radio bearer has been pre-established.
In case of connection loss, we do not buffer the received IP packets, as it will take time to re-establish the
connection (we will have to perform the whole registration process), and we do not even know if we will
still be using the TD-CDMA, or if the MTNM will decide to use another technology (WLAN / Ethernet).
The only case when we will probably want to buffer IP packets is during a fast handover between two
Radio Gateways, during the phase between the closing of the old connection and the opening of the new
connection; as the TD-CDMA driver is constantly “linked” to the IP stack and can receive packets at any
time during this process.
The Packet Transmission block receives IP packets from the enhanced IPv6 stack.
It will determine if it is an IP signalling packet or an IP data packet, by analysing its DSCP code (the IP
signalling packets will have a specific DSCP code).
The IP signalling packets are transmitted directly to the Control Channel Management block of the RCF
(with the local connection reference).
The data packets are analysed to perform the mapping between IP QoS classes and radio bearers / radio
QoS classes: based on the DSCP of the IP packet, a radio bearer is selected, with a radio QoS class
associated to it. The RCM manages a fixed number of radio bearer, each one associated to one of the
radio QoS class available. This mapping is performed on the Radio Gateway, not on the Mobile Terminal.
If the radio bearer is not yet establis hed, a request is made to the Data Channel Management block of the
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