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Methods and device to resolve TSF timer ambiguity of IEEE 802.11e schedule element

A timer, fuzzy technology, applied in the direction of electrical components, data exchange through path configuration, digital transmission system, etc., can solve the problem of future time or past time ambiguity

Inactive Publication Date: 2011-04-20
NXP BV
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  • Description
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  • Application Information

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Problems solved by technology

However, another problem arises, namely, the fact that the lower 32 bits of the TSF timer repeat themselves, thus introducing ambiguity as to whether a particular received reference time value refers to a time in the future or in the past

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  • Methods and device to resolve TSF timer ambiguity of IEEE 802.11e schedule element
  • Methods and device to resolve TSF timer ambiguity of IEEE 802.11e schedule element
  • Methods and device to resolve TSF timer ambiguity of IEEE 802.11e schedule element

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Embodiment Construction

[0018] Those of ordinary skill in the art will appreciate that the ensuing description is provided for purposes of illustration, not limitation. A skilled artisan understands that there are many variations that fall within the spirit of the invention and the scope of the appended claims. Unnecessary detail of known functions and operations may be omitted from the description so as not to obscure the invention.

[0019] figure 1 A timing diagram according to the present invention is shown. The Y axis represents the timing value m of the 802.11 TSF timer whose maximum value is M, and the X axis represents time t with a time period T. The period T is approximately 71 minutes, which correlates to the approximate time that the lower 32 bits of the 802.11 TSF timer overlap. It should be noted that not the figure 1 Separated into four separate figures, the four possibilities are shown on the same figure. Although "T" is referred to as the first T, and the subsequent periods iden...

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Abstract

A plurality of methods, computer program product, and apparatus that use a lower 32 bit field of a 64-bit 802.11 TSF timer, so as to encode the reference time instant without the ambiguity as to whether there the reference time is referring to a future time or a past time. According to an aspect of the present invention, the fact that the low order 32 bits of the TSF timer wraps over in about 71 minutes is exploited to remove any ambiguity in the reference times contained in the Schedule Element frame. One method employs an algorithm base on distance between two reference points to determine whether the timer has wrapped around a time period, and another method uses a delay interval or a timeout to determine whether or not the TSF timer is wrapped or unwrapped. Another method includes determining whether an absolute value of X-O is less than, or greater than or equal to maximum value M / 2.

Description

technical field [0001] The present invention relates to IEEE802.11e and identification of service cycle start. More particularly, the invention relates to encoding a reference time instant of a service period using part of a timing synchronization function. Background technique [0002] A wireless communication method for IEEE802.11e has been proposed. The Basic Service Set (BSS) of IEEE802.11WLAN consists of an access point (AP) and many stations connected to the AP. APs connect these stations to the infrastructure. [0003] A scheduling unit is included in the recently drafted IEEE802.11eTGeD4.0; this unit identifies a service period according to the first successful CF-Poll (Contention-Free Polling) or the start of downlink data transmission. However, due to the nature of the wireless medium, there is an inherent discrepancy as to when to start a scheduling unit since the quality of service station (QSTA) and quality of service access point (QAP) cannot observe the mom...

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Application Information

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IPC IPC(8): H04L12/28
CPCH04W72/12H04W56/00H04L12/28H04W74/04H04L7/00
Inventor J·德尔弗拉多帕冯A·索姆罗S·南达戈帕兰S·曼戈尔德Z·钟
Owner NXP BV
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