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 the new packet data support node is {TAIL ~ 2G SGSN} or {HEAD ~ 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 the new packet data support node is { TAIL ~ 2 G SGSN } or { HEAD ~ a CGSN }
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