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Latency reduction in shared or unlicensed spectrum

An unlicensed, response-delayed technology, applied in spectrum gap assessment, pilot signal allocation, transmission path separation devices, etc., can solve problems such as delay, communication interruption between UE and base station, etc.

Active Publication Date: 2019-06-21
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This may cause interruption and delay in communication between UE and base station

Method used

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  • Latency reduction in shared or unlicensed spectrum
  • Latency reduction in shared or unlicensed spectrum
  • Latency reduction in shared or unlicensed spectrum

Examples

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Embodiment Construction

[0078] A user equipment (UE) may transmit uplink (UL) messages in unlicensed spectrum, where the UL timing delay between downlink (DL) and UL transmissions is relative to that between DL and UL in licensed spectrum or other conventional operations. The UL timing delay between UL transmissions is reduced. UL timing delays can be reduced by using shortened transmission time intervals (TTIs) (eg, TTIs with a shorter duration than TTIs used in licensed spectrum). Additionally or alternatively, UL timing delays may be reduced by configuring fewer TTIs between, for example, granting of resources and corresponding UL messages transmitted using the granted resources.

[0079] Operating with reduced UL timing delays (eg, relative to conventional deployments) can reduce the likelihood that a UE will wait for a subsequent Transmission Opportunity (TxOp) to transmit a UL transmission in response to a DL transmission. For example, for communications in the unlicensed radio spectrum, base ...

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Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit uplink (UL) messages in unlicensed spectrum with a reduced UL timing delay. The UL timing delay may be reduced by using a shortened transmission time interval (TTI) (e.g., a TTI that is reduced in duration relative to other TTIs in the system or in a legacy system) or by reducing the number of TTIs between a grant and the corresponding UL message. The reduced UL timing delay may decrease the likelihood that the UE will wait for a subsequent transmit opportunity (TxOp) to transmit the UL message. In some cases, the reduced UL timing delay corresponds to a reduced hybrid automatic repeat request (HARQ) processing delay. In some cases, a time difference (e.g., measured in TTIs) between ameasurement reference TTI a corresponding channel state information (CSI) report may also be reduced.

Description

[0001] cross reference [0002] This patent application claims the benefit of U.S. Patent Application No. 15 / 460,215, filed March 15, 2017, by Hosseini et al., entitled "LatencyReduction In Shared Or Unlicensed Spectrum"; and Hosseini et al., filed November 9, 2016 Priority to US Provisional Patent Application No. 62 / 419,688, entitled "Latency Reduction In Unlicensed Spectrum," each of which is assigned to the assignee of the present application. technical field [0003] The following relates generally to wireless communications, and more specifically to delay reduction in unlicensed spectrum. Background technique [0004] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems are capable of supporting communication with multiple users by sharing available system resources (eg, time, frequency, and power). Examples of such multiple-access systems ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/12H04L1/18H04W72/14H04W74/08
CPCH04L5/001H04L5/005H04L5/0057H04L5/0064H04L5/0091H04L5/0092H04L5/14H04L27/0006H04L27/2602H04L5/0051H04W8/22H04W16/14H04W72/0446H04L1/1887H04L1/1861H04W74/0808H04L27/26025H04L27/2603H04W72/23H04W24/10
Inventor S·侯赛尼S·耶拉马利陈万士J·孙徐浩S·A·帕特尔
Owner QUALCOMM INC