| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and apparatus for supporting handover from LTE/EUTRAN to GPRS/GERAN.SOLUTION: A method and apparatus for handover of a dual mode WTRU (wireless transmit/receive unit) from an LTE system to a GERAN system uses measurements of the LTE and GERAN frequencies and a decision by a source evolved Node B to perform the handover. A GERAN access procedure includes PS attach messages exchanged between the WTRU and a target base station controller and a target SGSN. Alternatively, the GERAN access procedure uses RAN mobility information messages exchanged by the WTRU and the target base station controller and a relocation detect message by the source evolved Node B.SELECTED DRAWING: Figure 6A |
