| 摘要 |
A first device ( 104 ) receives a first message from a second device ( 100 ). Upon receipt of the first message, the first device transmits a registration request to the second device for pre-registration with a third device ( 102 ). If the second device does not receive the registration request from the first device within a predetermined time period, the second device re-transmits the first message to the first device if a communication link with the first device is still operational. If the first device receives the first message again from the second device prior to attaching to the third device, the first device re-transmits the registration request to the second device. If registration with the third device is not pending when the first device attaches to the third device, the third device transmits a second message to the first device to solicit a registration request from the first device.
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