System and method for enabling and disabling devices based on RSSI analysis

• US 6,853,840 B2
• Filed: 03/02/2001
• Issued: 02/08/2005
• Est. Priority Date: 03/02/2001
• Status: Active Grant

• Current Assignee: F Poszat Hu LLC (Intellectual Ventures LLC)
• Original Assignee: CSI Wireless Incorporated
• Inventors: Najafi, Hamid
• Primary Examiner(s): Corsaro, Nick
• Application Number:
  US09/798,272
• Publication Number:
  US 20020127967A1
• Time in Patent Office: 1,439 Days
• Field of Search: 455/426.2, 455/410, 455/3.06, 455/421, 455/74.1, 455/69, 455/456.1, 455/456.4, 455/574, 340/7.32, 340/7.36, 379/33, 379/35, 379/36, 379/37, 379/39
• US Class Current: 455/410
• CPC Class Codes: G01S 11/06 using intensity measurements
• CPC Class Codes: G01S 19/34 Power consumption
• CPC Class Codes: G01S 5/0027 of actual mobile position, i.e. position determined on mobile
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: H04W 84/14 WLL [Wireless Local Loop]; RLL [Radio Local Loop]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The system comprises a wireless transceiver with a processor for measuring RSSI in received signals. The processor analyzes fade duration or fade frequency in the received signals to determine if the transceiver is moving. If the transceiver is moving, then the processor can send a command to disable a fixed wireless terminal in one embodiment. In another embodiment, if the transceiver is not moving, then the processor can send a command to place a GPS receiver into a power conservation mode.

Claims

1. A fixed wireless terminal, comprising:

a wireless transceiver for sending and receiving signals, the wireless transceiver including a processor for detecting movement of the transceiver by examining at least one of RSSI fade duration and fade frequency in the received signal and deactivating the terminal if movement is detected wherein the movement is determined from the at least one of fade duration and fade frequency;

a speaker, coupled to the transceiver, for outputting the received signals as sounds;

a microphone, coupled to the transceiver, for inputting sound to the transceiver; and

a keypad, coupled to the transceiver, for entering telephone numbers.

2. The terminal of claim 1, wherein the examining uses fade duration.

3. The terminal of claim 1, wherein the examining uses fade frequency.

4. The terminal of claim 1, wherein the examining uses both fade frequency and fade duration.

5. A tracking device, comprising:

a GPS receiver for calculating position;

a wireless transceiver, coupled to the GPS receiver, for sending and receiving signals, the wireless transceiver including a processor for detecting movement of the transceiver by examining RSSI in a received signal and placing the GPS receiver in a power conservation mode if movement is not detected, wherein the movement is determined from either fade duration or fade frequency of the RSSI.