Dynamic access to communications using authorization assistance for request-to-send and clear-to-send messages
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A message and cellular communication technology, applied in the field of LAA communication, can solve the problems of streaming application performance reduction and data throughput reduction, and achieve the effect of improving coexistence characteristics and operating efficiency
Active Publication Date: 2022-01-11
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 throughput and / or reduced performance for streaming applications (data streaming) when both Wi-Fi and LAA / LTE-U signals are present
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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
The present invention relates to dynamic use of authorization-assisted access communications for request-to-send and clear-to-send messages. The present disclosure relates to performing cellular communications in unlicensed spectrum in a manner that takes into account the possible existence of hidden nodes by opportunistically introducing the use of RTS and CTS messages. A listen-before-talk process may be performed to determine whether a wireless medium is available. When the listen-before-talk process is complete, the amount of time until the next possible start time for communicating in the cellular communication system according to the timing synchronization scheme of the cellular communication system can be determined; The manner in which the wireless medium is occupied until the next possible start time of communication in the cellular communication system is selected in such a manner as to occupy the wireless medium for an amount of time at the next possible start time of communication. The cellular communication may be performed over 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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