Timing synchronization function - Revision history

5.102.9.41: /* IBSS operation overview */

2024-02-18T09:22:21Z

IBSS operation overview

← Previous revision		Revision as of 09:22, 18 February 2024
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	'''Timing synchronization function''' (TSF) is specified in [[IEEE 802.11]] wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all [[Station (networking)\|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 2<~~sup~~>64</~~sup~~> 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{{cn\|date=April 2019}}.		'''Timing synchronization function''' (TSF) is specified in [[IEEE 802.11]] wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all [[Station (networking)\|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 <math>2^{64}</math> 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{{cn\|date=April 2019}}.

	Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (intra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.		Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (intra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.
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	==IBSS operation overview==		==IBSS operation overview==
	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.		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.

	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 [0, 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.<ref>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</ref>		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 <math>w+1</math> slots each of length ''aSlotTime''. Each station calculates a random delay uniformly distributed in <math>[ 0, w]</math> 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.<ref>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</ref>

	== References ==		== References ==

89.140.15.130 at 07:50, 11 April 2023

2023-04-11T07:50:13Z

← Previous revision		Revision as of 07:50, 11 April 2023
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	'''Timing synchronization function''' (TSF) is specified in [[IEEE 802.11]] wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all [[Station (networking)\|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 2<sup>64</sup> 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{{cn\|date=April 2019}}.		'''Timing synchronization function''' (TSF) is specified in [[IEEE 802.11]] wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all [[Station (networking)\|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 2<sup>64</sup> 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{{cn\|date=April 2019}}.

	Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (~~infra~~) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.		Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (intra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.

	Each station maintains a TSF timer counting in increments of microseconds (μs). Stations adopt a received timing if it is later than the station’s own TSF timer.		Each station maintains a TSF timer counting in increments of microseconds (μs). Stations adopt a received timing if it is later than the station’s own TSF timer.

AnomieBOT: Dating maintenance tags: {{Cn}}

2019-04-24T05:43:31Z

Dating maintenance tags: {{Cn}}

← Previous revision		Revision as of 05:43, 24 April 2019
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	'''Timing synchronization function''' (TSF) is specified in [[IEEE 802.11]] wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all [[Station (networking)\|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 2<sup>64</sup> 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{{cn}}.		'''Timing synchronization function''' (TSF) is specified in [[IEEE 802.11]] wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all [[Station (networking)\|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 2<sup>64</sup> 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{{cn\|date=April 2019}}.

	Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (infra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.		Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (infra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.

Nicolas09F9: And of course I got the template wrong. Use {{cn}}

2019-04-23T23:52:05Z

And of course I got the template wrong. Use {{cn}}

← Previous revision		Revision as of 23:52, 23 April 2019
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	'''Timing synchronization function''' (TSF) is specified in [[IEEE 802.11]] wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all [[Station (networking)\|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 2<sup>64</sup> 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{{~~ref~~}}.		'''Timing synchronization function''' (TSF) is specified in [[IEEE 802.11]] wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all [[Station (networking)\|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 2<sup>64</sup> 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{{cn}}.

	Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (infra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.		Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (infra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.

Nicolas09F9: Replace "reference?" by the proper {{ref}} template

2019-04-23T23:50:39Z

Replace "reference?" by the proper {{ref}} template

← Previous revision		Revision as of 23:50, 23 April 2019
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	'''Timing synchronization function''' (TSF) is specified in [[IEEE 802.11]] wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all [[Station (networking)\|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 2<sup>64</sup> 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~~[reference?]~~.		'''Timing synchronization function''' (TSF) is specified in [[IEEE 802.11]] wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all [[Station (networking)\|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 2<sup>64</sup> 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{{ref}}.

	Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (infra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.		Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (infra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.

98.248.49.153 at 22:47, 19 February 2018

2018-02-19T22:47:23Z

← Previous revision		Revision as of 22:47, 19 February 2018
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	'''Timing synchronization function''' (TSF) is specified in [[IEEE 802.11]] wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all [[Station (networking)\|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 2<sup>64</sup> 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 function''' (TSF) is specified in [[IEEE 802.11]] wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all [[Station (networking)\|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 2<sup>64</sup> 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[reference?].

	Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (infra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.		Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (infra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.

Tony1 at 02:21, 2 September 2017

2017-09-02T02:21:36Z

← Previous revision		Revision as of 02:21, 2 September 2017
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	'''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 [[Station (networking)\|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 2<sup>64</sup> 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 function''' (TSF) is specified in [[IEEE 802.11]] wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all [[Station (networking)\|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 2<sup>64</sup> 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. In (infra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.		Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (infra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.
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	Each station maintains a TSF timer counting in increments of microseconds (μs). Stations adopt a received timing if it is later than the station’s own TSF timer.		Each station maintains a TSF timer counting in increments of microseconds (μs). Stations adopt a received timing if it is later than the station’s own TSF timer.

	==IBSS ~~Operation~~ ~~Overview~~==		==IBSS operation overview==
	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.		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.

	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 [0, 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.<ref>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</ref>		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 [0, 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.<ref>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</ref>
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	== See also ==		== See also ==
	* [[Point ~~Coordination~~ ~~Function~~]]		* [[Point coordination function]]

	[[Category:IEEE 802.11]]		[[Category:IEEE 802.11]]

Tony1: Tony1 moved page Timing Synchronization Function to Timing synchronization function

2017-09-02T02:20:27Z

Tony1 moved page Timing Synchronization Function to Timing synchronization function

← Previous revision	Revision as of 02:20, 2 September 2017
(No difference)

Jmgonzalez at 21:47, 6 January 2017

2017-01-06T21:47:31Z

← Previous revision		Revision as of 21:47, 6 January 2017
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	'''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 [[Station (networking)\|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 2<sup>64</sup> 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 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 [[Station (networking)\|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 2<sup>64</sup> 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~~.		Timing synchronization is achieved by stations periodically exchanging timing information through beacon frames. In (infra) BSS, the AP sends the TSF information in the beacons. In Independent Basic Service Set (IBSS, ad-hoc), each station competes to send the beacon.

			Each station maintains a TSF timer counting in increments of microseconds (μs). Stations adopt a received timing if it is later than the station’s own TSF timer.
⚫	==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 [0, 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.<ref>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</ref>
		⚫	==IBSS Operation Overview==
			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.

		⚫	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 [0, 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.<ref>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</ref>

	== References ==		== References ==

50.136.247.190: /* See also */ cat IEEE 802.11

2013-09-09T19:05:02Z

← Previous revision		Revision as of 19:05, 9 September 2013
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	== See also ==		== See also ==
⚫	* [[IEEE 802.11]]
	* [[Point Coordination Function]]		* [[Point Coordination Function]]

		⚫	[[Category:IEEE 802.11]]
	{{internet-stub}}

	[[Category:Internet Standards]]