METHOD AND DEVICE FOR ACQUIRING A PATH LOSS

• US 20120289268A1
• Filed: 05/18/2012
• Published: 11/15/2012
• Est. Priority Date: 11/18/2009
• Status: Abandoned Application

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: ZHANG, Liwen, Yang, Kaifeng, Chu, Dongyu
• Application Number:
  US13/475,113
• Publication Number:
  US 20120289268A1
• Time in Patent Office: Days
• US Class Current: 455/507
• CPC Class Codes: G01S 5/02521 using a radio-map

Abstract

Embodiments of the present invention disclose a method and a device for acquiring a path loss. The method includes: determining a current location of a terminal according to traffic channel signal strength of a current cell accessed by the terminal and broadcast control channel signal strength of at least one neighboring cell actually received by the terminal; or, determining the current location of the terminal according to broadcast control channel signal strength of at least two neighboring cells of the current cell accessed by the terminal; and acquiring a path loss of a corresponding designated neighboring cell from a correspondence according to the determined current location of the terminal. According to the embodiments of the present invention, as long as the network-side device can determine the current location of the terminal, the network-side device is capable of acquiring the path loss from the current location to any designated neighboring cell.

Claims

1. A method for acquiring a path loss, characterized by comprising:

determining a current location of a terminal according to traffic channel signal strength of a current cell accessed by the terminal and broadcast control channel signal strength of at least one neighboring cell actually received by the terminal;

or, determining the current location of the terminal according to broadcast control channel signal strength of at least two neighboring cells of the current cell accessed by the terminal; and

acquiring a path loss of a corresponding designated neighboring cell from pre-stored correspondence according to the determined current location of the terminal.

2. The method according to claim 1, wherein the acquiring the path loss of the corresponding designated neighboring cell from the pre-stored correspondence according to the determined current location of the terminal comprises:

acquiring the path loss of the corresponding designated neighboring cell from pre-stored correspondence between locations of the terminal and path losses of cells according to the determined current location of the terminal, wherein

the pre-stored correspondence between locations of the terminal and path losses of cells is established in the following manner;

dividing locations of the same signal strength according to traffic channel signal strength of any one cell and broadcast control channel signal strength of at least one neighboring cell of the any one cell, or according to broadcast control channel signal strength of at least two neighboring cells of the any one cell, wherein signal strength of a same cell received by the terminal at each location of the same signal strength is equal;

acquiring a path loss from each location of the same signal strength of the any one cell to a neighboring cell according to broadcast control channel signal strength of the neighboring cell received at the each location of the same signal strength of the any one cell and transmit power of a base station where the neighboring cell is located; and

establishing correspondence between the each location of the same signal strength of the any one cell and the path loss from the each location of the same signal strength of the any one cell to each neighboring cell.

3. The method according to claim 2, wherein the acquiring the path loss from the each location of the same signal strength of the any one cell to the neighboring cell comprises:

performing sliding window filtering or averaging filtering on the path loss from the each location of the same signal strength of the any one cell to the neighboring cell, and using the filtered path loss as the path loss from the location of the same signal strength to the neighboring cell.

4. The method according to claim 2, wherein the correspondence between the location of the same signal strength of the any one cell and the path loss from the location of the same signal strength of the any one cell to each neighboring cell is represented in a manner of a matrix or a table.

5. The method according to claim 2, wherein the determining the current location of the terminal comprises:

obtaining at least two curves with equal received signal strength according to the traffic channel signal strength of the current cell accessed by the terminal and the broadcast control channel signal strength of at least one neighboring cell actually received by the terminal, or the broadcast control channel signal strength of at least two neighboring cells of the current cell accessed by the terminal; and

determining an intersection location of the at least two curves as the current location of the terminal.

6. The method according to claim 1, wherein the acquiring the path loss of the corresponding designated neighboring cell from the pre-stored correspondence according to the determined current location of the terminal comprises:

acquiring broadcast control signal strength of the corresponding designated neighboring cell from pre-stored correspondence between locations of the terminal and broadcast control signal strength of cells according to the determined current location of the terminal;

acquiring the path loss from the current location to the designated neighboring cell according to the broadcast control signal strength and transmit power of a base station where the neighboring cell is located, wherein

the correspondence between locations of the terminal and broadcast control signal strength of cells is established in the following manners;

dividing locations of same signal strength of any one cell according to traffic channel signal strength of the any one cell and broadcast control channel signal strength of at least one neighboring cell of the any one cell, or broadcast control channel signal strength of at least two neighboring cells of the any one cell, wherein signal strength of a same cell received by the terminal at the locations of the same signal strength is equal; and

acquiring the traffic channel signal strength of the current cell and the broadcast control channel signal strength of the designated neighboring cell according to the locations of the same signal strength, and establishing the correspondence between the locations of the same signal strength of the any one cell and the broadcast control channel signal strength from the locations of the same signal strength to each neighboring cell.

7. The method according to claim 6, wherein the determining the current location of the terminal comprises:

obtaining at least two curves with equal received signal strength according to the traffic channel signal strength of the current cell accessed by the terminal and the broadcast control channel signal strength of at least one neighboring cell actually received by the terminal, or the broadcast control channel signal strength of at least two neighboring cells of the current cell accessed by the terminal; and

determining an intersection location of the at least two curves as the current location of the terminal.

8. The method according to claim 1, wherein the designated neighboring cell is a neighboring cell broadcast control channel signal strength of which is not received by the terminal.

9. A device for acquiring a path loss, characterized by comprising:

a determining module, configured to determine a current location of a terminal according to traffic channel signal strength of a current cell accessed by the terminal and broadcast control channel signal strength of at least one neighboring cell actually received by the terminal;

or, determine the current location of the terminal according to broadcast control channel signal strength of at least two neighboring cells of the current cell accessed by the terminal; and

a matching acquisition module, configured to acquire a path loss of a corresponding designated neighboring cell from pre-stored correspondence according to the determined current location of the terminal.

10. The device according to claim 9, wherein the matching acquisition module acquires the path loss of the corresponding designated neighboring cell from the pre-stored correspondence between locations of the terminal and path losses of cells according to the determined current location of the terminal.

11. The device according to claim 9, wherein the matching acquisition module comprises:

a signal strength acquisition module, configured to acquire broadcast control signal strength of the corresponding designated neighboring cell according to correspondence between locations of the terminal and broadcast control signal strength of cells; and

a path loss acquisition module, configured to acquire the path loss from the current location to the designated neighboring cell according to transmit power of a base station where the neighboring cell is located and the broadcast control signal strength acquired by the signal strength acquisition module.

12. The device according to claim 9, wherein the determining module comprises:

an obtaining sub-module, configured to obtain at least two curves with equal received signal strength according to the traffic channel signal strength of the current cell accessed by the terminal and the broadcast control channel signal strength of at least one neighboring cell actually received by the terminal, or the broadcast control channel signal strength of at least two neighboring cells of the current cell accessed by the terminal; and

a determining sub-module, configured to determine an intersection location of the at least two curves as the current location of the terminal.

13. The device according to claim 9, wherein the pre-stored correspondence is a correspondence between locations of the terminal and path losses of cells according to the determined current location of the terminal, and the pre-stored correspondence between locations of the terminal and path losses of cells is established in the following manner:

dividing locations of the same signal strength according to traffic channel signal strength of any one cell and broadcast control channel signal strength of at least one neighboring cell of the any one cell, or according to broadcast control channel signal strength of at least two neighboring cells of the any one cell, wherein signal strength of a same cell received by the terminal at each location of the same signal strength is equal;

acquiring a path loss from each location of the same signal strength of the any one cell to a neighboring cell according to broadcast control channel signal strength of the neighboring cell received at the each location of the same signal strength of the any one cell and transmit power of a base station where the neighboring cell is located; and

establishing correspondence between the each location of the same signal strength of the any one cell and the path loss from the each location of the same signal strength of the any one cell to each neighboring cell.

14. The device according to claim 9, wherein the pre-stored correspondence is a correspondence between locations of the terminal and broadcast control signal strength of cells according to the determined current location of the terminal, and the correspondence between locations of the terminal and broadcast control signal strength of cells is established in the following manners:

dividing locations of same signal strength of any one cell according to traffic channel signal strength of the any one cell and broadcast control channel signal strength of at least one neighboring cell of the any one cell, or broadcast control channel signal strength of at least two neighboring cells of the any one cell, wherein signal strength of a same cell received by the terminal at the locations of the same signal strength is equal; and

acquiring the traffic channel signal strength of the current cell and the broadcast control channel signal strength of the designated neighboring cell according to the locations of the same signal strength, and establishing the correspondence between the locations of the same signal strength of the any one cell and the broadcast control channel signal strength from the locations of the same signal strength to each neighboring cell.

15. The device according to claim 14, wherein the matching acquisition module is configure to acquire the path loss from the current location to the designated neighboring cell according to the broadcast control signal strength and transmit power of a base station where the neighboring cell is located.

16. The device according to claim 9, wherein the designated neighboring cell is a neighboring cell broadcast control channel signal strength of which is not received by the terminal.

17. The device according to claim 9, wherein the device for acquiring a path loss is a network-side device.

18. The device according to claim 9, wherein the device for acquiring a path loss is a terminal.