Moby Dick Consolidated System Integration Plan

D0103v1.doc Version 1 6.7.2003
After the reception of a ROUTER_SOLICITATION_PROXY at the ‘old’ access router a
HANDOVER_INITIATE message is generated and send to the new access router. The new access router
responds with a HANDOVER_ACK message to the old access router. Receiving this packet the old router
invokes the bicasting, i.e., duplicates all packets destined for the mobile terminal and send these packets
to the old and the new care-of address simultaneously. The FAST_HANDOVER_ACK is generated and
send to the mobile node in order to inform the mobile terminal that the preparation is done.
Figure 33 shows an detailed overview of the FHO module.
This module will also take care of the context transfer. Some context related parameters from AAAC and
Security must be transferred from the oAR to the nAR to prepare a handover. The following table
presents the parameters included into the context transfer communication.
RCF Fast Handover Module
WCDMA
Connection Manager
Fast Handover
Wcdma
Open /
Execution
Infos
Close
Context
Transfer
Conn
Figure 33: Fast Handover Module
Context Transfer Message Format
Name Type Length
SA tripple doskey 24 Byte
SPI Integer fix 4 Byte
NAI String 50 Bytes maximum
Meter Configuration
Session ID + User_Class 17 Bytes
Table 5: Context Transfer Format
When the IPv6 stack receives fast handover protocol messages (ICMP packets or destination options in IP
packets), it informs the fast handover module of the correspondent situation. The fast handover module
will request the IPv6 stack to send the messages (ICMP packets or destination options to be included in
other packets) needed for fast handover procedures. The procedures that are carried out in the FHM when
the AR is acting as oAR on behalf of a MT that wants to execute a handover to a nAR are described in
figure 34.
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