A wireless communication device and a method for transmitting and receiving at least one frame between a terminal device, connected to the wireless communication device, and an interworking function. Selected ones of a plurality of corresponding configuration options of a first and a second instance...http://www.google.co.uk/patents/US6625164?utm_source=gb-gplus-sharePatent US6625164 - Selectively framing and unframing PPP packets depending on negotiated options on the Um and Rm interfaces
