Feedback resource mapping in wireless communications

摘要

A feedback radio resource in a license-exempt frequency band maps from a data radio resource to at least one frequency sub-band which the data resource excludes. The feedback resource is also spaced in time from the data resource by a predetermined interval. Feedback (ACK/NACK) for data received in the data resource is then sent in the feedback resource. In various embodiments the sub-band is one or more edges of the data resource channel, or of a license-exempt component carrier. The predetermined interval may be a function of how much of the data resource is occupied by data. The data transmitting device delays sending its data by a time offset from the end of a previous transmission on that channel, or if it does not know the end time it delays until the predetermined interval plus the length of the feedback resource have lapsed. Various synchronization aspects are also disclosed.

主权项

1. An apparatus comprising:
at least one processor and at least one memory storing a computer program; in which the at least one memory with the computer program is configured with the at least one processor to cause the apparatus to at least: map a feedback radio resource in a license-exempt frequency band from a data radio resource to at least one frequency sub-band which the data radio resource excludes and spaced in time from the data radio resource by a predetermined interval, said at least one frequency sub-band comprising frequency edges of a radio channel bearing the data radio resource; and send or receive feedback for information received or sent on the data radio resource on the mapped feedback radio resource.