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Clear Channel Assessment for Determining Availability of Unlicensed Spectrum for Extending LTE Capacity

A technique for clear channel assessment and availability, applied in spectrum gap assessment, multiplexing communication, transmission modification based on link quality, etc., which can solve problems such as inefficient use of spectrum

Active Publication Date: 2019-07-26
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach can provide a partial solution to the congestion problem, as WLANs tend to use spectrum less efficiently than cellular networks

Method used

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  • Clear Channel Assessment for Determining Availability of Unlicensed Spectrum for Extending LTE Capacity
  • Clear Channel Assessment for Determining Availability of Unlicensed Spectrum for Extending LTE Capacity
  • Clear Channel Assessment for Determining Availability of Unlicensed Spectrum for Extending LTE Capacity

Examples

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Embodiment Construction

[0090] Various systems, methods, and apparatus are described in which unlicensed spectrum is used for LTE communications. Various deployment scenarios can be supported, including a supplemental downlink mode where LTE downlink traffic can be offloaded to unlicensed spectrum. Carrier aggregation mode can be used to offload both LTE downlink and uplink traffic from licensed to unlicensed spectrum. In standalone mode, LTE downlink and uplink communications between a base station (eg, eNB) and UEs can take place in unlicensed spectrum. LTE and other base stations and UEs may support one or more of these or similar modes of operation. OFDMA communication signals may be used for LTE downlink communications in the unlicensed spectrum, while SC-FDMA communication signals may be used for LTE uplink communications in the unlicensed spectrum.

[0091] Carriers currently see WiFi as the primary mechanism for using unlicensed spectrum to alleviate escalating congestion in cellular networ...

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Abstract

Methods and apparatus are described in which unlicensed spectrum is used for Long Term Evolution (LTE) communications. The first method includes performing a clear channel assessment (CCA) to determine the availability of unlicensed spectrum, transmitting a request to send (RTS) signal using the unlicensed spectrum to a set of user equipment (UEs) when a determination is made that unlicensed spectrum is available, and responding Based on the RTS signal, a common clear-to-send (CTS) signal and individual CTS signals are received from one or more UEs in an unlicensed spectrum. The second method consists of transmitting an RTS signal in an unlicensed spectrum or a V-RTS signal in a licensed spectrum, the RTS signal or V-RTS signal being addressed to a set of UEs, and together with the transmission of the V-RTS signal in the unlicensed spectrum Transmits the CTS‑to‑self signal.

Description

[0001] cross reference [0002] This patent application claims U.S. Patent Application No. entitled "Collision Avoidance Scheme for Wireless Communications Over Unlicensed Spectrum" filed May 19, 2014 by Bhushan et al. 14 / 281,629, and priority to U.S. Provisional Patent Application No. 61 / 825,459, filed May 20, 2013, by Bhushan et al., entitled "LTE-Unlicensed (LTE Unlicensed)," each of which assigned to the assignee of this application. technical field [0003] The present invention relates to wireless communication, and in particular to collision avoidance in wireless communication. Background technique [0004] Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and so on. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing available network resources. [0005] A wireless communication network may include a number of bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08
CPCH04W88/06H04W88/08H04L27/2602H04L5/0044H04L27/0006H04L5/001H04L5/14H04L5/1469H04W56/0015H04L1/0003H04L1/0009H04L1/0026H04L5/005H04J11/00H04W16/14H04L27/2603H04W28/0289H04W72/12H04W74/0833H04L1/00H04L5/0053H04W24/02H04W28/0252H04W28/16H04W48/10H04W56/001H04W56/002H04W72/04H04W74/006H04W74/04H04W74/0808H04W74/0816H04W84/12H04W88/02H04W76/15H04W72/21H04W72/541H04W74/002H04W72/0446H04W24/10H04L5/00H04W74/08H04L1/003H04L1/009H04L1/0612
Inventor N·布衫D·P·玛拉迪Y·魏P·盖尔T·罗T·姬G·B·霍恩W·陈A·达蒙佳诺维克
Owner QUALCOMM INC