Lbt parameters for uplink in unlicensed spectrum

a technology of unlicensed spectrum and listenbeforetalk, applied in the field of wireless communication, can solve the problems of unfulfilled use cases, unlicensed spectrum transmission requirements, and insufficient signaling parameters, so as to reduce network load and device complexity, improve uplink and/or system performance, and reduce the amount of signaling
US20190182865A1Inactive Publication Date: 2019-06-13TELEFON AB LM ERICSSON (PUBL)
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
TELEFON AB LM ERICSSON (PUBL)
Publication Date
2019-06-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

According to some embodiments, a method for use in a user equipment (UE) of managing a listen-before-talk (LBT) contention window size comprises transmitting a first burst of uplink subframes after a first LBT procedure performed using an LBT contention window size, and determining a reference subframe based on the first burst. The reference subframe is associated with a reference hybrid automatic repeat request (HARQ) process identifier. The method further comprises receiving scheduling for a second burst of uplink subframes. The scheduling comprises an associated HARQ process identifier and an associated new data indicator (NDI) for each subframe. When the UE determines the HARQ process identifier associated with at least one of the subframes of the second burst matches the reference HARQ process identifier, then if the associated NDI indicates new data, the method resets the LBT contention window size, else the method increments the LBT contention window size.
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Description

TECHNICAL FIELD

[0001] Particular embodiments are directed to wireless communications and, more particularly, to methods and apparatus for signaling and management of listen-before-talk (LBT) parameters for uplink transmission in unlicensed spectrum.INTRODUCTION

[0002] The Third Generation Partnership Project (3GPP) initiative referred to as License Assisted Access (LAA) enables long term evolution (LTE) equipment to operate in the unlicensed 5 GHz radio spectrum. The unlicensed 5 GHz spectrum is used as a complement to the licensed spectrum. Accordingly, devices connect in the licensed spectrum (primary cell or PCell) and use carrier aggregation to benefit from additional transmission capacity in the unlicensed spectrum (secondary cell or SCell). To reduce the changes required for aggregating licensed and unlicensed spectrum, the LTE frame timing in the primary cell is simultaneously used in the secondary cell.

[0003] The standalone LTE-U forum and 3GPP Rel-14 work item on Uplink License...

Claims

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