DISTANCE MEASUREMENT AND ALARM METHOD AND APPARATUS

• US 20130287011A1
• Filed: 03/21/2013
• Published: 10/31/2013
• Est. Priority Date: 04/27/2012
• Status: Active Grant

• Current Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhao, Lei
• Granted Patent: US 9,007,948 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 4/023 using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
• CPC Class Codes: H04W 4/21 for social networking applications
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]

Abstract

Embodiments of the present invention relate to a distance measurement and alarm method and apparatus. The method includes: sending pairing request information for establishing a connection with a receiving terminal; after the receiving terminal is paired with, calculating a current distance to the receiving terminal; comparing the current distance with a preset distance threshold, and if the current distance exceeds the distance threshold, displaying distance prompt information.

Claims

1. A distance measurement and alarm method, comprising:

sending pairing request information for establishing a connection with a receiving terminal;

after the receiving terminal is paired with, calculating a current distance to the receiving terminal; and

comparing the current distance with a preset distance threshold, and if the current distance exceeds the distance threshold, displaying distance prompt information.

2. The distance measurement and alarm method according to claim 1, wherein after the sending pairing request information for establishing a connection with a receiving terminal, the method further comprises:

receiving response information sent by the receiving terminal, wherein the response information is information that the receiving terminal is successfully paired with;

selecting a channel model equation according to a comparison between a theoretical distance and an input original distance;

calculating the current distance to the receiving terminal by using the channel model equation;

wherein

the theoretical distance is a distance when signal strength is uniform and no building blockage is present to the receiving terminal; and

the original distance is a distance when signal strength is not uniform due to blockages such as buildings and impurities to the receiving terminal.

3. The distance measurement and alarm method according to claim 2, wherein the selecting a channel model equation according to a comparison between a theoretical distance and an input original distance specifically is:

according to a difference between the theoretical distance and the input original distance, selecting a channel model equation from a plurality of mathematical models in a database program.

4. The distance measurement and alarm method according to claim 2, wherein the calculating the current distance to the receiving terminal by using the channel model equation specifically is:

detecting space signal strength and a bit error rate to the receiving terminal regularly, and calculating the current distance to the receiving terminal through the channel model equation.

5. The distance measurement and alarm method according to claim 1, further comprising:

if the current distance does not exceed the distance threshold, continuing to detect space signal strength and a bit error rate to the receiving terminal regularly, and calculating the current distance to the receiving terminal through the channel model equation.

6. A distance measurement and alarm apparatus, comprising:

a sending unit, configured to send pairing request information for establishing a connection with a receiving terminal;

a measuring unit, configured to, after the receiving terminal is paired with, calculate a current distance to the receiving terminal; and

a first executing unit, configured to compare the current distance with a preset distance threshold, and if the current distance exceeds the distance threshold, display distance prompt information.

7. The distance measurement and alarm apparatus according to claim 6, further comprising:

a receiving unit, configured to receive response information sent by the receiving terminal, wherein the response information is information that the receiving terminal is successfully paired with;

a selecting unit, configured to select a channel model equation according to a comparison between a theoretical distance and an input original distance;

the measuring unit is specifically configured to calculate the current distance to the receiving terminal by using the channel model equation;

wherein

the theoretical distance is a distance when signal strength is uniform and no building blockage is present to the receiving terminal; and

the original distance is a distance when signal strength is not uniform due to blockages such as buildings and impurities to the receiving terminal.

8. The distance measurement and alarm apparatus according to claim 7, wherein the selecting unit is specifically configured to:

according to a difference between the theoretical distance and the input original distance, select a channel model equation from a plurality of mathematical models in a database program.

9. The distance measurement and alarm apparatus according to claim 7, wherein the measuring unit is further specifically configured to:

detect space signal strength and a bit error rate to the receiving terminal regularly, and calculate the current distance to the receiving terminal through the channel model equation.

10. The distance measurement and alarm apparatus according to claim 6, further comprising:

a second executing unit, configured to, if the current distance does not exceed the distance threshold, continue to detect space signal strength and a bit error rate to the receiving terminal regularly, and calculate the current distance to the receiving terminal through the channel model equation.