Contention-based transmission with contention-free feedback for reducing latency in LTE advanced networks and enhanced PUCCH
First Claim
1. A method performed by user equipment (UE) for random access transmission of uplink user data, the method comprising:
- transmitting a contention sequence on a physical uplink control channel (PUCCH) to an enhanced-Node B (eNB);
transmitting user data on a physical uplink shared channel (PUSCH) to the eNB without a prior grant of resources for uplink data transmission on the PUSCH, the user data and the contention sequence being concurrently transmitted in a same subframe;
performing a procedure for grant of uplink resources when the contention sequence is successfully received by the eNB and when the user data is not successfully received by the eNB, the procedure for grant of uplink resources comprising either a random-access channel (RACH) procedure or a scheduling request (SR) procedure; and
when the user data is successfully received by the eNB, refraining from performing the procedure for grant of uplink resources,wherein the contention sequence is transmitted on the PUCCH in accordance with a format that is assigned by the eNB, the contention sequence being either randomly selected by the UE or assigned by the eNB,wherein the user data does not include a request for uplink resources, andwherein when the eNB is unable to detect the user data transmitted on the PUSCH but is able to detect the contention sequence, the UE is arranged to perform either the RACH procedure or the SR procedure.
2 Assignments
0 Petitions
Accused Products
Abstract
Methods for contention-based transmission with contention-free feedback for reduced latency in LTE Advanced networks and an enhanced PUCCH are generally disclosed herein. User equipment (UE) may transmit a contention sequence on a physical uplink control channel (PUCCH) to an enhanced-Node B (eNB) and may concurrently transmit data requesting uplink resources on a physical uplink shared channel (PUSCH) to the eNB. The contention sequence is transmitted on the PUCCH in accordance with a format that is assigned by the eNB. The contention sequence is either randomly selected by the UE or assigned by the eNB. When the contention sequence and data are not successfully received by the eNB, the UE may fall back to a more conventional random access channel (RACH) procedure for uplink resource allocation.
19 Citations
12 Claims
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1. A method performed by user equipment (UE) for random access transmission of uplink user data, the method comprising:
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transmitting a contention sequence on a physical uplink control channel (PUCCH) to an enhanced-Node B (eNB); transmitting user data on a physical uplink shared channel (PUSCH) to the eNB without a prior grant of resources for uplink data transmission on the PUSCH, the user data and the contention sequence being concurrently transmitted in a same subframe; performing a procedure for grant of uplink resources when the contention sequence is successfully received by the eNB and when the user data is not successfully received by the eNB, the procedure for grant of uplink resources comprising either a random-access channel (RACH) procedure or a scheduling request (SR) procedure; and when the user data is successfully received by the eNB, refraining from performing the procedure for grant of uplink resources, wherein the contention sequence is transmitted on the PUCCH in accordance with a format that is assigned by the eNB, the contention sequence being either randomly selected by the UE or assigned by the eNB, wherein the user data does not include a request for uplink resources, and wherein when the eNB is unable to detect the user data transmitted on the PUSCH but is able to detect the contention sequence, the UE is arranged to perform either the RACH procedure or the SR procedure. - View Dependent Claims (2, 3, 4)
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5. User equipment (UE) arranged for random access transmission of uplink user data, the UE comprising physical (PHY) layer circuitry and medium-access control (MAC) layer circuitry arranged to:
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transmit a contention sequence on a physical uplink control channel (PUCCH) to an enhanced-Node B (eNB); transmit user data on a physical uplink shared channel (PUSCH) to the eNB without a prior grant of resources for uplink data transmission on the PUSCH, the user data and the contention sequence being concurrently transmitted in a same subframe; perform a procedure for grant of uplink resources when the contention sequence is successfully received by the eNB and when the user data is not successfully received by the eNB, the procedure for grant of uplink resources comprising either a random-access channel (RACH) procedure or a scheduling request (SR) procedure; and when the user data is successfully received by the eNB, the UE is arranged to refrain from performing the procedure for grant of uplink resources, wherein the contention sequence is transmitted on the PUCCH in accordance with a format that is assigned by the eNB, the contention sequence being either randomly selected by the UE or assigned by the eNB, wherein the user data does not include a request for uplink resources, and wherein when the eNB is unable to detect the user data transmitted on the PUSCH but is able to detect the contention sequence, the UE is arranged to perform either the RACH procedure or the SR procedure. - View Dependent Claims (6, 7, 8)
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9. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors to cause user equipment (UE) to perform operations to:
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transmit a contention sequence on a physical uplink control channel (PUCCH) to an enhanced-Node B (eNB); transmit user data on a physical uplink shared channel (PUSCH) to the eNB without a prior grant of resources for uplink data transmission on the PUSCH, the user data and the contention sequence being concurrently transmitted in a same subframe; perform a procedure for grant of uplink resources when the contention sequence is successfully received by the eNB and when the user data is not successfully received by the eNB, the procedure for grant of uplink resources comprising either a random-access channel (RACH) procedure or a scheduling request (SR) procedure; and when the user data is successfully received by the eNB, the UE is arranged to refrain from performing the procedure for grant of uplink resources, wherein the contention sequence is transmitted on the PUCCH in accordance with a format that is assigned by the eNB, the contention sequence being either randomly selected by the UE or assigned by the eNB, wherein the user data does not include a request for uplink resources, and wherein when the eNB is unable to detect the user data transmitted on the PUSCH but is able to detect the contention sequence, the UE is arranged to perform either the RACH procedure or the SR procedure. - View Dependent Claims (10, 11, 12)
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Specification