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Channel reservation techniques for unlicensed spectrum

A channel reservation and spectrum band technology, applied in the field of unlicensed spectrum channel reservation technology, can solve communication delays, increase communication delays, etc.

Active Publication Date: 2018-08-31
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In cases where base stations and / or UEs and Wi-Fi devices cannot effectively communicate without frame collisions in the same unlicensed RF spectrum, communications may be delayed, increasing communication latency

Method used

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  • Channel reservation techniques for unlicensed spectrum
  • Channel reservation techniques for unlicensed spectrum
  • Channel reservation techniques for unlicensed spectrum

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Embodiment Construction

[0052]Wireless devices using radio access technologies (RATs) such as Long Term Evolution (LTE) / LTE-Advanced (LTE-A) may operate as independent carriers in multiple bands of shared or unlicensed radio frequency (RF) spectrum. As a result, a wireless device may use technology from one RAT (eg, LTE / LTE-A) to improve technology used by a different RAT (eg, Wi-Fi) that also communicates within the unlicensed RF spectrum. Channel reservation techniques such as request-to-send (RTS) and clear-to-send (CTS) procedures can be used in Wi-Fi systems to address interference, such as by hidden nodes (e.g., wireless channels close to the receiver but out of range of the transmitter). node) caused interference. However, e.g. for RATs like LTE / LTE-A operating in unlicensed RF spectrum, the lack of channel reservation techniques can lead to communication inefficiencies due to interference, especially in the presence of hidden nodes and bursty interference .

[0053] As a result, wireless co...

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Abstract

Methods, systems, and devices for wireless communication are described. A base station may identify a transmission opportunity duration and an allocation for downlink and uplink transmissions, then broadcast a channel reservation request transmission. The broadcast may be sent using unlicensed radio frequency spectrum over a channel that includes multiple-sub-bands. The channel reservation transmission may include the identified duration, allocation, and a channel state information (CSI) request. User equipments (UEs) may receive the broadcast, and respond with a channel reservation response transmission that includes a CSI report, a transmit identity, or an interference threshold indicator. In some cases, some or all of the UEs may transmit a sounding reference signal (SRS) in response toan SRS request that is broadcast by the base station. The base station may schedule uplink and / or downlink transmissions to at least a subset of the multiple UEs based on the channel reservation response and / or SRS.

Description

[0001] cross reference [0002] This patent application claims the benefit of U.S. Patent Application No. 15 / 154,344, filed May 13, 2016, entitled "ChannelReservation Techniques for Unlicensed Spectrum," by Mallik et al., and Mallik et al., filed January 27, 2016. Priority to U.S. Provisional Patent Application No. 62 / 287,604 for "Channel Reservation Techniques for 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 particularly to channel reservation techniques for 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08H04W72/04H04W72/54
CPCH04W72/0446H04W74/0808H04W52/00H04W72/1268H04L5/0048H04W72/1273H04B7/0626H04W72/53H04W72/541
Inventor S·马利克A·达姆尼亚诺维奇J·孙T·余张晓霞D·P·马拉蒂
Owner QUALCOMM INC