Particularly the source radio network control node comprises an RNC and the old packet data support node comprises a 3G SGSN or CGSN, whereas {HEAD ~ the target radio network control node} is {TAIL ~ a BSS node} and the new packet data support node is 2G SGSN or a CGSN 
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Particularly the source radio network control node comprises an RNC and the old packet data support node comprises a 3 G SGSN or CGSN , whereas { HEAD ~ the target radio network control node } is { TAIL ~ a BSS node } and the new packet data support node is 2 G SGSN or a CGSN
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH