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