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System frame number (SFN) evaluator

A system frame number and evaluator technology, applied in the field of synchronization, can solve the problems that the access terminal cannot receive calls and cannot maintain the frame synchronization of the communication network, etc.

Inactive Publication Date: 2009-08-12
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technique is limited because if the SFN maintained at the access terminal is incorrect, the access terminal will not be able to receive calls or maintain frame synchronization with the communication network

Method used

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  • System frame number (SFN) evaluator
  • System frame number (SFN) evaluator
  • System frame number (SFN) evaluator

Examples

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Embodiment Construction

[0010] The word "exemplary" is used herein to mean "serving as an instance, instance, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or preferred over other embodiments.

[0011] figure 1 is a block diagram of a communication system 100 according to an exemplary embodiment of the present invention. The communication system 100 includes at least one access terminal 102 in communication with at least one base station 104 via a wireless communication link 106 . In most implementations, however, several base stations 104 connected by a communication network provide wireless service to access terminals 102 in multiple geographic areas. For example, base station 104 may be connected to a base station controller and a network controller through wired or wireless backhaul.

[0012] An access terminal 102 is any wireless communication device that communicates with one or more base stations over a wireless communicatio...

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PUM

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Abstract

An access terminal (102) reacquires a system frame number (SFN) when a difference between a continuous counter elapsed time (220) and a calculated elapsed time (222) exceeds a threshold. The continuous counter elapsed time (220) is generated by a continuous counter (122) remaining active during a sleep state of the access terminal (102) and the calculated elapsed time (222) is based on a SFN derived from a counter value generated by a discontinuous counter (124) that is deactivated during the sleep state. In one aspect, the continuous counter (122) may be clocked by a continuous clock (118) during a sleep mode and the discontinuous counter (124) may be clocked by a faster clock (120) that is deactivated during the sleep mode. During reactivation after the sleep mode, the discontinuous counter (120) is set, at the counter set time, to a reset counter value (126) corresponding to an SFN indicated by the continuous counter (122).

Description

technical field [0001] The present invention relates generally to synchronization in communication systems, and more particularly to system frame number error detection. Background technique [0002] Many wireless communication systems employ communication protocols that arrange control information and data in frames, where an access terminal (user communication device) provides a reference for the timing of receive and transmit tasks based on a System Frame Number (SFN). For example, an access terminal may access information sent from the communication network within a particular frame relative to the current SFN. Accordingly, an access terminal must maintain frame synchronization with the communication network by tracking and updating the SFN in order to properly receive information. For example, in an asynchronous communication system, such as a system operating according to the WCDMA standard, a base station pages an access terminal during a paging occasion (Paging Occa...

Claims

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Application Information

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IPC IPC(8): H04B1/16H04W52/02H04W76/04
CPCH04W52/029H04W76/046H04W76/048H04W76/27H04W76/28Y02D30/70H04W8/26H04W56/004H04W56/0055H04W88/02
Inventor M·阿梅尔加G·辛格A·拉奥K·奇卡帕C·库马尔M·高拉穆迪S·凯沙瓦
Owner QUALCOMM INC
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