| 摘要 |
Disclosed is a handover method that comprises a step wherein a radio access network apparatus on a first mobile communication system acquires and stores service identification information which specifies the services offered to a mobile station, and a step wherein the radio access network apparatus on the first mobile communication system, in the procedure to perform a hard handover, determines, based on the service identification information, whether to forward downlink data received from a upper node to a radio access network apparatus on a second mobile communication system that is not equipped with a re-ordering function for incoming downlink data.
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