翻訳と辞書 Words near each other ・ Timing belt ・ Timing belt (camshaft) ・ Timing channel ・ Timing closure ・ Timing diagram ・ Timing diagram (Unified Modeling Language) ・ Timing failure ・ Timing Is Everything ・ Timing Is Everything (album) ・ Timing Library Format ・ Timing light ・ Timing margin ・ Timing mark ・ Timing of Sahabah becoming Muslims ・ Timing point ・ Timing Synchronization Function ・ Timingila ・ Timiperone ・ Timipre Sylva ・ Timir Biswas ・ Timir Datta ・ Timir mine ・ Timir Pinegin ・ Timiri ・ Timiri block ・ Timirlan Shavanov ・ Timiryazev ・ Timiryazev (crater) ・ Timiryazev District ・ Timiryazev, Azerbaijan Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Timing Synchronization Function ： ウィキペディア英語版 Timing Synchronization Function Timing Synchronization Function (TSF) is specified in IEEE 802.11 wireless local area network (WLAN) standard to fulfill timing synchronization among users. A Timing Synchronization Function (TSF) keeps the timers for all stations in the same Basic Service Set (BSS) synchronized. All stations shall maintain a local TSF timer. Each mobile host maintains a TSF timer with modulus 264 counting in increments of microseconds. The TSF is based on a 1-MHz clock and "ticks" in microseconds. On a commercial level, industry vendors assume the 802.11 TSF's synchronization to be within 25 microseconds. Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. Each station in an Independent Basic Service Set (IBSS) shall adopt a received timing if it is later than the station’s own TSF timer. All stations in the IBSS adopt a common value, aBeaconPeriod, that defines the length of beacon intervals or periods. This value, established by the station that initiates the IBSS, defines a series of Target Beacon Transmission Times (TBTTs) exactly aBeaconPeriod time units apart. Time zero is defined to be a TBTT. ==Overview== Each station maintains a TSF timer counting in increments of microseconds (μs). All stations in the IBSS compete for beacon transmission every aBeaconPeriod time units. This time period is called a beacon period (BP). At the beginning of each BP, there is a beacon generation window consisting of w + 1 slots each of length aSlotTime. Each station calculates a random delay uniformly distributed in (w ) and is scheduled to transmit a beacon when the delay timer expires. If a beacon arrives before the random delay timer has expired, the station cancels the pending beacon transmission and the remaining random delay. Upon receiving a beacon, a station sets its TSF timer to the timestamp of the beacon if the value of the timestamp is later than the station’s TSF timer.〔D. Zhou and T.H. Lai, "A Compatible and Scalable Clock Synchronization Protocol in IEEE 802.11 ad Hoc Networks," in the Proceedings of the 2005 International Conference on Parallel Processing〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Timing Synchronization Function」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.