License assisted access communication with dynamic use of request-to-send and clear-to-send messages
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A technology of message and cellular communication system, applied in the field of LAA communication, which can solve the problems of reduced data throughput and performance of streaming applications, etc.
Active Publication Date: 2018-01-23
APPLE INC
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However, co-existing cellular and Wi-Fi communications in the same frequency band can still result in reduced data throughp
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[0023] acronym
[0024] Various acronyms are used throughout this application. The definitions of the most prominently used acronyms that may appear throughout this application are as follows:
[0025] UE: User Equipment
[0026] RF: radio frequency
[0027] BS: base station
[0028] GSM: Global System for Mobile Communications
[0029] UMTS: Universal Mobile Telecommunications System
[0030] LTE: Long Term Evolution
[0031] LTE-U: Unlicensed LTE
[0032] LAA: Authorized Assisted Access
[0033] TDD: Time Division Duplex
[0034] FDD: frequency division duplex
[0035] TX: transmit / transmit
[0036] RX: receive / accept
[0037] LAN: local area network
[0038] WLAN: Wireless LAN
[0039] ·LBT: Listen before speaking
[0040] AP: access point
[0041] RAT: radio access technology
[0042] IEEE: Institute of Electrical and Electronics Engineers
[0043] Wi-Fi: Wireless Local Area Network (WLAN) RAT based on IEEE 802.11 standard
[0044] the term
[0045] ...
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Abstract
This disclosure relates to license assisted access communication with dynamic use of request-to-send and clear-to-send messages. This disclosure relates to performing cellular communication in unlicensed spectrum in a manner that accounts for the possible existence of hidden nodes by opportunistically introducing the use of RTS and CTS messages. A listen-before-talk procedure may be performed to determine whether a wireless medium is available. When the listen-before-talk procedure is complete, an amount of time until a next possible start time for communicating in the cellular communication system according to a timing synchronization scheme for the cellular communication system may be determined. The wireless medium may be occupied until the next possible start time for communicating inthe cellular communication system in a manner selected based at least in part on the amount of time until the next possible start time for communicating in the cellular communication system. Cellularcommunication may be performed on the wireless medium at the next possible start time for communicating in the cellular communication system.
Description
technical field [0001] The present application relates to wireless communications, and more particularly to systems, apparatus and methods for performing LAA communications using dynamic RTS / CTS. Background technique [0002] The use of wireless communication systems is growing rapidly. In recent years, wireless devices such as smartphones and tablets have become increasingly sophisticated. In addition to supporting phone calls, many mobile devices (i.e., user equipment devices, or UEs) now provide access to the Internet, e-mail, text messaging, and navigation using the Global Positioning System (GPS), and are able to operate Sophisticated applications. Additionally, many different wireless communication technologies and standards exist. Some examples of wireless communication standards include GSM, UMTS (e.g., associated with WCDMA or TD-SCDMA air interfaces), LTE, LTE-Advanced (LTE-A), HSPA, 3GPP2CDMA2000 (e.g., 1xRTT, 1xEV-DO, HRPD, eHRPD) , IEEE802.11(WLAN or Wi-Fi),...
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Application Information
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