Scheduling request transmissions in the unlicensed spectrum

Abstract

A number of embodiments can describe the operation of a UE in an unlicensed spectrum. Operating a UE in an unlicensed spectrum can include processing a PDCCH transmission provided by an eNodeB to identify a resource for a transmission of the SR message and based on the resource identified in the PDCCH, generating a PUCCH transmission comprising the SR message for the eNodeB.

1 . An apparatus for a user equipment (UE) operating in an unlicensed spectrum, comprising:
 electronic memory to store a scheduling request (SR) message; and   one or more baseband processors configured to:
 process a physical downlink control channel (PDCCH) transmission provided by an evolved node B (eNodeB) to identify a resource for a transmission of the SR message; and 
 based on the resource identified in the PDCCH, generate a physical uplink control channel (PUCCH) transmission comprising the SR message for the eNodeB. 
   
     
     
         2 . The apparatus of  claim 1 , wherein the one or more processors configured to process the PDCCH transmission are further configured to process a physical downlink control channel scrambled by CC-RNTI (cPDCCH). 
     
     
         3 . The apparatus of  claim 1 , wherein the PUCCH transmission spans 4 symbols spanning one of the interlaces of block-interleaved frequency division multiple access (B-IFDMA) structure. 
     
     
         4 . The apparatus of  claim 1 , wherein the one or more processors configured to generate the PUCCH transmission are further configured to generate a short PUCCH (sPUCCH) transmission. 
     
     
         5 . The apparatus of  claim 4 , wherein the sPUCCH transmission is time multiplexed with a PUSCH transmission. 
     
     
         6 . An apparatus for an evolved node B (eNodeB) operating in an unlicensed spectrum, comprising:
 electronic memory to store a scheduling request (SR) message; and   one or more baseband processors configured to:
 configure, using higher layer signaling, an SR resource for a transmission of the SR message on a short physical uplink control channel (sPUCCH); 
 encode a physical downlink control channel (PDCCH) scrambled by a CC radio network temporary identifier (CC-RNTI) transmission indicating the SR resource; and 
 process the sPUCCH from a user equipment (UE) to determine an uplink schedule for the UE based on the SR message. 
   
     
     
         7 . The apparatus of  claim 6 , wherein the one or more baseband processors are further configured to configure the SR resource comprising a burst identification (ID). 
     
     
         8 . The apparatus of  claim 6 , wherein the one or more baseband processors are further configured to configure the SR resource comprising an uplink (UL) subframe offset. 
     
     
         9 . The apparatus of  claim 8 , wherein the UL subframe offset is configured by a radio resource control (RRC) configuration. 
     
     
         10 . The apparatus of  claim 8 , wherein the UL subframe offset is configured by a physical downlink control channel scrambled by CC-RNTI (cPDCCH). 
     
     
         11 . The apparatus of  claim 6 , wherein the one or more baseband processors are further configured to configure the SR resource comprising a burst ID and an UL subframe offset. 
     
     
         12 . The apparatus of  claim 6 , wherein the SR resource is generated by an RRC layer. 
     
     
         13 . A computer-readable storage medium having stored thereon instructions that, when implemented by a user equipment (UE), cause the UE to:
 generate a scheduling request (SR) message;   perform a listen before talk (LBT) procedure on a non-anchored subframe;   encode a physical random access channel (PRACH) transmission comprising the SR message for a transmission of the SR message in response to a successful completion of the LBT procedure;   process a physical downlink control channel scrambled by CC-RNTI (cPDCCH) transmission comprising a schedule for a transmission of an uplink transmission; and   encode the uplink transmission based on the schedule.   
     
     
         14 . The computer-readable storage medium of  claim 13 , wherein the instructions configured to perform the LBT procedure are further configured to perform the LBT procedure repetitively until the successful completion of the LBT procedure. 
     
     
         15 . The computer-readable storage medium of  claim 13 , wherein the instructions configured to perform the LBT procedure further comprise instructions to perform a category (CAT) 4 LBT procedure on non-anchor subframe. 
     
     
         16 . The computer-readable storage medium of  claim 13 , wherein the instructions configured to perform the LBT procedure further comprise instructions to perform a one shot LBT procedure when cPDCCH is detected, and the LBT procedure is configured to be the one shot LBT procedure by a higher layer. 
     
     
         17 . The computer-readable storage medium of  claim 13 , wherein the instructions configured to perform the LBT procedure further comprise instructions to perform a no LBT procedure when cPDCCH is detected, and the LBT procedure is configured to be a no LBT procedure by a higher layer followed by 16 us DL/UL gap. 
     
     
         18 . The computer-readable storage medium of  claim 17 , wherein the instructions configured to encode the PRACH transmission comprising the SR message for the transmission of the SR message in response to the successful completion of the LBT procedure further comprise instructions to encode the PRACH transmission comprising the SR message for the transmission of the SR message in response to the successful completion of one shot LBT procedure. 
     
     
         19 . The computer-readable storage medium of  claim 17 , wherein the uplink transmission is provided via a short physical uplink control channel (sPUCCH) for SR transmissions.