The present document defines the stage-2 service description for packet switched handover in GERAN A/Gb mode and GAN mode. ITU-T Recommendation I.130 [8] describes a three-stage method for characterisation of telecommunication services@ and ITU-T Recommendation Q.65 [9] defines stage 2 of the method. The present document refers to packet switched handover in GERAN A/Gb mode/GAN mode@ and therefore focuses on the corresponding radio protocol enhancements to the packet switched domain only i.e. when services are provided through the Gb interface.