Techniques for cell access using an unlicensed radio frequency spectrum band
First Claim
1. A method of wireless communication comprising:
- receiving, by a user equipment (UE), a channel occupancy signal prior to a start of a subframe within a radio frame;
determining that the subframe is a candidate for a contention-based access procedure and transmission of a request message for access to an unlicensed radio frequency spectrum band based at least in part on reception of the channel occupancy signal;
identifying a first subset of symbols within the subframe for performing the contention-based access procedure for gaining access to the unlicensed radio frequency spectrum band and a second subset of symbols within the subframe for transmission of the request message for access to the unlicensed radio frequency spectrum band, wherein the first subset of symbols is identified based at least in part on a hardware delay or software delay for detecting the channel occupancy signal and a first subframe boundary of the subframe within the radio frame;
performing the contention-based access procedure during the first subset of symbols; and
transmitting the request message during the second subset of symbols based at least in part on an outcome of the contention-based access procedure.
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Abstract
Techniques are described for wireless communication. One method includes winning a contention for access to an unlicensed radio frequency spectrum band, transmitting a request message upon winning the contention for access to the unlicensed radio frequency spectrum band, and receiving a response message over the unlicensed radio frequency spectrum band. The request message is transmitted by a user equipment (UE) on an enhanced physical random access channel (ePRACH) or shortened ePRACH (SePRACH), to access a cell that operates in the unlicensed radio frequency spectrum band. The response message is received in response to transmitting the request message, and the request message may be transmitted irrespective of whether a base station has gained access to the unlicensed radio frequency spectrum band.
25 Citations
20 Claims
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1. A method of wireless communication comprising:
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receiving, by a user equipment (UE), a channel occupancy signal prior to a start of a subframe within a radio frame; determining that the subframe is a candidate for a contention-based access procedure and transmission of a request message for access to an unlicensed radio frequency spectrum band based at least in part on reception of the channel occupancy signal; identifying a first subset of symbols within the subframe for performing the contention-based access procedure for gaining access to the unlicensed radio frequency spectrum band and a second subset of symbols within the subframe for transmission of the request message for access to the unlicensed radio frequency spectrum band, wherein the first subset of symbols is identified based at least in part on a hardware delay or software delay for detecting the channel occupancy signal and a first subframe boundary of the subframe within the radio frame; performing the contention-based access procedure during the first subset of symbols; and transmitting the request message during the second subset of symbols based at least in part on an outcome of the contention-based access procedure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for wireless communications at a wireless device, comprising:
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a processor; and
memory coupled with the processor, wherein the processor is configured to;receive, by a user equipment (UE), a channel occupancy signal prior to a start of a subframe within a radio frame; determine that the subframe is a candidate for a contention-based access procedure and transmission of a request message for access to an unlicensed radio frequency spectrum band based at least in part on reception of the channel occupancy signal; identify a first subset of symbols within the subframe for performing the contention-based access procedure for gaining access to the unlicensed radio frequency spectrum band and a second subset of symbols within the subframe for transmission of the request message for access to the unlicensed radio frequency spectrum band, wherein the first subset of symbols is identified based at least in part on a hardware delay or software delay for detecting the channel occupancy signal and a first subframe boundary of the subframe within the radio frame; perform the contention-based access procedure during the first subset of symbols; and transmit the request message during the second subset of symbols based at least in part on an outcome of the contention-based access procedure. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification