| 摘要 |
System and method for enabling the cohabitation of licensed and unlicensed communications devices. A method comprises receiving a transmission permission request from a secondary device during a first transmission slot of a first communications period, decoding the transmission permission request, responding to the transmission permission request in a second transmission slot in response to a determining that a decision on the transmission permission request has been made, and receiving a transmission in a second communications period. The transmission permission request comprises a codeword generated by concatenating two sequences shorter in length than the codeword.
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