Updating system and method of timing synchronization function timer in low power consumption WIFI system

Abstract

The invention discloses an updating system and method of timing synchronization function timer in a low power consumption WIFI system. The method comprises the following steps: performing digit extension on TSF Timer to obtain a new TSF Timer, wherein new_TSF_Timer={TSF_Timer, {z{1'b0}}}, z represents the number of the low-bit extension digital of the TSF Timer, and the new TSF Time unit is changed as ns from microsecond; under the high-speed clock condition, the high-speed clock can product 1 microsecond of pulse, the new_TSF_Timer=new_TSF_Timer+pow(2,z) at intervals of 1 microsecond, whereinpow(2,z) represents the z power computation of 2; when the system is switched to the low-speed, the high-speed clock is turned off, and the low-speed clock begins counting, the new_TSF_Timer=new_TSF_Timer+deltaT at the rising edge of each low-speed clock, wherein deltaT=T*pow(2,z) / 1000, and T is the cycle of the low-speed clock. The right-shifting z-digit operation is performed on the new TSF Timer, and the digital of the new TSF Timer is reduced, and the unit thereof is reduced as the microsecond from the ns. The updating method disclosed by the invention only needs the addition and shiftingoperation, the realization complexity is reduced, the precision of the protocol requirement is satisfied, and the development cost and the production cost of the chip are reduced.

Description

technical field [0001] The present invention relates to the field of wireless network communication, in particular to a system and method for updating a TSF Timer (Timing Synchronization Function Timer) in a low-power 802.11 WIFI (Wireless Fidelity, Wireless Fidelity) system. Background technique [0002] The 802.11 protocol is a standard for wireless local area networks, which defines the data interaction mode between AP (Access Point, wireless access point) and STA (Station, station, each terminal connected to the wireless network can become a station) , in a low-power WIFI system, when there is no data transmission between the AP and the STA, the STA can enter a low-power mode, such as figure 1 Sleep stages shown. The AP needs to periodically send beacon frames. This period is defined in the protocol as TBTT (Target Beacon Transmission Time, beacon scheduled transmission time), figure 1 A, B, C, and D in all are beacon (beacon) packets, and the STA needs to wake up once...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a system and method for updating TSF Timer in a low-power WIFI system, which is used to realize how to perform easy-to-digital data processing in a low-power WIFI system when the low-power WIFI system is switched from a high-speed clock to a low-speed clock. Achieving the purpose of the TSF Timer update question

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