Description  Claims  Drawing  Cited references 

US2009232022A1   [0016] 

3GPP Technical Specification TS 23.501 V0.4.0   [0005] 
Select the Proper PDN/PDP Type for Multi-mode Terminals with IPv6 Support   [0016] 
3GPP Technical Specification TS 23.502 V0.3.0   [0054]