Power control method to mitigate interference for in-device coexistence

• US 8,934,362 B2
• Filed: 01/05/2012
• Issued: 01/13/2015
• Est. Priority Date: 01/06/2011
• Status: Active Grant

• Current Assignee: HFI Innovation, Inc. (MediaTek, Inc.)
• Original Assignee: MediaTek, Inc.
• Inventors: Hsu, Chia-Chun, Lin, Chih-Yuan, Chen, Yih-Shen, Fu, I-Kang, Roberts, Michael
• Primary Examiner(s): Rinehart, Mark
• Assistant Examiner(s): BROCKMAN, ANGEL T
• Application Number:
  US13/344,589
• Publication Number:
  US 20120176923A1
• Time in Patent Office: 1,104 Days
• Field of Search: 370/252, 370/254
• US Class Current: 370/252
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/38 TPC being performed in particular situations
• CPC Class Codes: H04W 72/51 based on terminal or device properties

Abstract

A power control method to mitigate in-device coexistence (IDC) interference is provided. A wireless communication device (UE) is equipped with a first LTE radio module and a second co-located WiFi/BT/GSNN radio module. Upon detecting coexistence or IDC interference, the UE applies power control method to mitigate the interference. In a first embodiment, the LTE radio module adjusts its power parameters locally without informing the serving eNB. In a second embodiment, the LTE radio module adjusts its power parameters and implicit informs the eNB through existing PHR reporting. In a third embodiment, the LTE radio module changes its power or power class and explicitly informs the eNB through UE capability or new RRC message or MAC CE. Power control can be used as a low cost and lightweight solution before applying other heavyweight solutions that either require more resource or control overhead, or have higher impact on throughput.

Claims

1. A method comprising:

(a) determining an in-device coexistence (IDC) interference condition by a first OFDMA radio module co-located with a second radio module on a wireless communication device (UE);

(b) determining power parameters by adjusting a UE-configured maximum transmitting power of the first OFDMA radio module via adjusting a maximum power reduction (MPR) value based on the determined IDC interference condition, wherein the power parameters comprise the UE-configured maximum transmitting power set by the UE and a power headroom report (PHR) of the first radio module; and

(c) transmitting the adjusted power parameters to a serving base station upon satisfying a triggering condition to mitigate IDC interference.

2. The method of claim 1, wherein the determining in (a) involves receiving a coexistence notification from a control entity on the wireless device.

3. The method of claim 1, wherein the determining in (a) involves an activation or deactivation of the second radio module.

4. The method of claim 1, wherein the adjusting in (b) involves increasing a maximum power reduction (MPR) value and thereby decreasing the UE-configured maximum transmitting power of the first radio module.

5. The method of claim 1, wherein the triggering condition in (c) is satisfied if an adjustment of the UE-configured maximum transmitting power exceeds a threshold value.

6. The method of claim 1, further comprising:

(d) transmitting a coexistence indicator from the first LTE radio module to the serving base station.

7. A wireless communication device (UE), comprising:

a first OFDMA radio module that determines an in-device coexistence (IDC) interference condition, wherein the first OFDMA radio module is co-located with a second radio module on the wireless communication device, the first OFDMA radio module comprises;

a power control module that determines power parameters by adjusting a UE-configured maximum transmitting power of the first radio module via adjusting a maximum power reduction (MPR) value based on the determined IDC interference condition, wherein the power parameters comprise the UE-configured maximum transmitting power set by the UE and a power headroom report (PHR) of the first radio module; and

a radio transceiver that transmits the adjusted power parameters to a serving base station upon satisfying a triggering condition to mitigate IDC interference.

8. The device of claim 7, wherein the first OFDMA radio module receiving a coexistence notification from a control entity on the wireless device.

9. The device of claim 7, wherein the first OFDMA radio module detects an activation or deactivation of the second radio module.

10. The device of claim 7, wherein the power control module increases a maximum power reduction (MPR) value and thereby decreasing the UE-configured maximum transmitting power of the first radio module.

11. The device of claim 7, wherein the radio transceiver transmits the adjusted power parameters if an adjustment of the UE-configured maximum transmitting power exceeds a threshold value.

12. The device of claim 7, wherein the radio transceiver transmits a coexistence indicator to the serving base station.

13. A method, comprising:

(a) determining an in-device coexistence (IDC) interference condition by a first OFDMA radio module co-located with a second radio module on a wireless communication device;

(b) switching to a new UE power class of the first OFDMA radio module based on the determined IDC interference condition; and

(c) reporting the new UE power class to a serving base station to mitigate IDC interference.

14. The method of claim 13, wherein the determining in (a) involves receiving a coexistence notification from a control entity on the wireless device.

15. The method of claim 13, wherein the determining in (a) involves an activation or deactivation of the second radio module.

16. The method of claim 13, wherein the UE power class reporting is via a radio resource control (RRC) message.

17. The method of claim 13, wherein the UE power class reporting is via a media access control (MAC) control element (CE).

18. The method of claim 13, wherein the UE power class reporting is via an information element (IE) contained in user equipment (UE) capability.

19. The method of claim 13, further comprising:

(d) transmitting a coexistence indicator from the first LTE radio module to the serving base station.