Low latency physical layer design for contention-based uplink channels
First Claim
1. A method for wireless communication by a base station, comprising:
- assigning different groups of resources, within an uplink subframe, to different groups of one or more user equipments (UEs), wherein each UE selects resources from its assigned group for contention-based access within the uplink subframe; and
decoding uplink transmissions received from the UEs in the subframe based, at least in part, on the assigned group of resources, wherein the decoding comprises;
detecting a demodulated reference signal (DMRS) from at least one uplink transmission that is not successfully decoded;
identifying a UE that sent the uplink transmission based on the detected DMRS; and
transmitting an uplink assignment to the identified UE.
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Accused Products
Abstract
Certain aspects relate to methods and apparatus for latency reduction for UEs in a RRC connected mode. During contention-based uplink access by groups of UEs within a subframe, an eNB may decode the received uplink transmission based, at least in part, on the assigned group of resources assigned to the UE and used for transmission. Additional orthogonalization techniques such as reduced TTI size can be used to reduce collisions among different users performing contention-based transmissions. Furthermore, when the eNB fails to successfully decode the uplink transmission, the eNB may identify the UE that sent the uplink transmission based on a detected reference signal and may transmit an uplink assignment to the identified UE.
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Citations
27 Claims
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1. A method for wireless communication by a base station, comprising:
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assigning different groups of resources, within an uplink subframe, to different groups of one or more user equipments (UEs), wherein each UE selects resources from its assigned group for contention-based access within the uplink subframe; and decoding uplink transmissions received from the UEs in the subframe based, at least in part, on the assigned group of resources, wherein the decoding comprises; detecting a demodulated reference signal (DMRS) from at least one uplink transmission that is not successfully decoded; identifying a UE that sent the uplink transmission based on the detected DMRS; and transmitting an uplink assignment to the identified UE. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for wireless communication, comprising:
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means for assigning different groups of resources, within an uplink subframe, to different groups of one or more user equipments (UEs), wherein each UE selects resources from its assigned group for contention-based access within the uplink subframe; and means for decoding uplink transmissions received from the UEs in the subframe based, at least in part, on the assigned group of resources, wherein the means for decoding comprises; means for detecting a demodulated reference signal (DMRS) from at least one uplink transmission that is not successfully decoded; means for identifying a UE that sent the uplink transmission based on the detected DMRS; and means for transmitting an uplink assignment to the identified UE. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An apparatus for wireless communication comprising at least one processor and a memory coupled to the at least one processor, wherein:
the at least one processor is configured to; assign different groups of resources, within an uplink subframe, to different groups of one or more user equipments (UEs), wherein each UE selects resources from its assigned group for contention-based access within the uplink subframe; and decode uplink transmissions received from the UEs in the subframe based, at least in part, on the assigned group of resources, wherein the at least one processor configured to decode the uplink transmissions is configured to; detect a demodulated reference signal (DMRS) from at least one uplink transmission that is not successfully decoded; identify a UE that sent the uplink transmission based on the detected DMRS; and transmit an uplink assignment to the identified UE. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A non-transitory computer readable medium for wireless communication having instructions stored thereon, the instructions executable by one or more processors for:
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assigning different groups of resources, within an uplink subframe, to different groups of one or more user equipments (UEs), wherein each UE selects resources from its assigned group for contention-based access within the uplink subframe; and decoding uplink transmissions received from the UEs in the subframe based, at least in part, on the assigned group of resources, wherein the decoding comprises; detecting a demodulated reference signal (DMRS) from at least one uplink transmission that is not successfully decoded; identifying a UE that sent the uplink transmission based on the detected DMRS; and transmitting an uplink assignment to the identified UE. - View Dependent Claims (24, 25, 26, 27)
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Specification