| 摘要 |
A method involving: sending from a first apparatus to a second apparatus a first message identifying the first apparatus and a second message scheduling a time period for reply; receiving at the first apparatus during the time period scheduled by the second message a third message sent by the second apparatus; and in response to receiving the third message, changing a role of the first apparatus so that it is operable to schedule bi-directional data transfer between the first apparatus and the second apparatus.
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