Joint WLAN power and rate control to mitigate co-located LTE TDD interference

Patent metadata

Field	Value
Publication number	US-9319926-B2
Application number	US-201414166535-A
Country	US
Kind code	B2
Filing date	Jan 28, 2014
Priority date	Jan 28, 2014
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

In some implementations, a method of a wireless local area network (WLAN) transmitter includes, in response to interference with a long term evolution (LTE) receiver, determining a de-sense value of the LTE receiver; determining a transmission rate for the WLAN transmitter, the transmission rate requiring an equal or lower receiver sensitivity than a received signal strength threshold; determining a frame aggregation size based on the transmission rate and an LTE frame configuration for the LTE receiver; determining a transmission power based on the de-sense value; and transmitting data during a downlink receiving period of the LTE receiver using the transmission rate, the frame aggregation size, and the transmission power.

First claim

What is claimed is:

1. A method performed at a wireless local area network (WLAN) transmitter of a communication system in response to interference with a long term evolution (LTE) receiver, the method comprising:
determining a de-sense value of the LTE receiver;
determining a transmission rate for the WLAN transmitter, the transmission rate requiring an equal or lower receiver sensitivity than a received signal strength threshold;
determining a frame aggregation size based on the transmission rate and an LTE frame configuration for the LTE receiver;
determining a transmission power based on the de-sense value;
determining a throughput based on the transmission rate and the frame aggregation size;
determining the throughput is greater than a throughput for a current transmission rate and a current frame aggregation size; and
in response to determining the throughput is greater, transmitting data during a downlink receiving period of the LTE receiver using the transmission rate, the frame aggregation size, and the transmission power.

2. The method of claim 1 , wherein the received signal strength threshold is determined based on a difference between received signal strength measured at a WLAN receiver and the de-sense value of the LTE receiver.

3. The method of claim 1 , wherein the received signal strength threshold is determined based on a difference between a second required receiver sensitivity of a second transmission rate of the WLAN transmitter and the de-sense value of the LTE receiver.

4. The method of claim 1 , wherein the LTE frame configuration comprises an LTE time division duplex (TDD) frame configuration and transmitting data comprises transmitting data during an entire LTE TDD frame of the LTE receiver using the transmission rate, the frame aggregation size, and the transmission power.

5. The method of claim 1 , wherein the LTE frame configuration for the LTE receiver is received over an interface between the WLAN transmitter and the LTE receiver.

6. The method of claim 1 , wherein the transmission rate is a first transmission rate and the frame aggregation size is a first frame aggregation size, and the current transmission rate is a second transmission rate and the current aggregation size is a second aggregation size, the method comprising:
determining a first efficiency based on the first frame aggregation size;
determining a first throughput based on the first transmission rate and the first efficiency;
determining a second frame aggregation size based on a second transmission rate and the LTE frame configuration for the LTE receiver;
determining a second efficiency based on the second frame aggregation size;
determining a second throughput based on the second transmission rate and the second efficiency; and
wherein transmitting data during the downlink receiving period of the LTE receiver using the first transmission rate, the first frame aggregation size, and the transmission power comprises transmitting data during the downlink receiving period of the LTE receiver using the first transmission rate, the first frame aggregation size, and the transmission power only if the first throughput is larger than the second throughput.

7. The method of claim 6 , wherein determining the second frame aggregation size comprise determining a maximum frame aggregation size that can be transmitted during an LTE uplink transmission period using the second transmission rate.

8. The method of claim 6 , wherein determining the first frame aggregation size comprise determining a maximum frame aggregation size that can be transmitted during an entire LTE TDD frame time using the first transmission rate.

9. An apparatus of a communication network, comprising:
a long term evolution (LTE) receiver; and
a wireless local area network (WLAN) transmitter, the WLAN transmitter configured to:
determine a de-sense value of the LTE receiver;
determine a transmission rate for the WLAN transmitter, the transmission rate requiring an equal or lower receiver sensitivity than a received signal strength threshold;
determine a frame aggregation size based on the transmission rate and an LTE frame configuration for the LTE receiver;
determine a transmission power based on the de-sense value;
determine a throughput based on the transmission rate and the frame aggregation size;
determine the throughput is greater than a throughput for a current transmission rate and a current frame aggregation size; and
in response to determination that the throughput is greater, transmit data during a downlink receiving period of the LTE receiver using the transmission rate, the frame aggregation size, and the transmission power.

10. The apparatus of claim 9 , wherein the received signal strength threshold is determined based on a difference between received signal strength measured at a WLAN receiver and the de-sense value of the LTE receiver.

11. The apparatus of claim 9 , wherein the received signal strength threshold is determined based on a difference between a second required receiver sensitivity of a second transmission rate of the WLAN transmitter and the de-sense value of the LTE receiver.

12. The apparatus of claim 9 , wherein the LTE frame configuration comprises an LTE time division duplex (TDD) frame configuration and the WLAN transmitter is configured to transmit data during an entire LTE TDD frame of the LTE receiver using the transmission rate, the frame aggregation size, and the transmission power.

13. The apparatus of claim 9 , wherein the transmission rate is a first transmission rate and the frame aggregation size is a first frame aggregation size, and the current transmission rate is a second transmission rate and the current aggregation size is a second aggregation size, and the WLAN transmitter is configured to:
determine a first efficiency based on the first frame aggregation size;
determine a first throughput based on the first transmission rate and the first efficiency;
determine a second frame aggregation size based on a second transmission rate and the LTE frame configuration for the LTE receiver;
determine a second efficiency based on the second frame aggregation size;
determine a second throughput based on the second transmission rate and the second efficiency; and
wherein the WLAN transmitter is configured to transmit data during the downlink receiving period of the LTE receiver using the first transmission rate, the first frame aggregation size, and the transmission power only if the first throughput is larger than the second throughput.

14. The apparatus of claim 9 , wherein the WLAN transmitter is configured to receive the LTE frame configuration over an interface between the WLAN transmitter and the LTE receiver.

15. A non-transitory computer-readable medium storing instructions that are operable when executed by data processing apparatus to perform operations at a first wireless devices in response to interference with a long term evolution (LTE) receiver, the operations comprising:
determining a de-sense value of the LTE receiver;
determining a transmission rate for the WLAN transmitter, the transmission rate requiring an equal or lower receiver sensitivity than a received signal strength threshold;
determining a frame aggregation size based on the transmission rate and an LTE frame configuration for the LTE receiver;
determining a transmission power based on the de-sense value;
determining a throughput based on the transmission rate and the frame aggregation size;
determining the throughput is greater than a throughput for a current transmission rate and a current frame aggrega

Assignees

• Blackberry Ltd

Inventors

• Smadi Mohammed Nawaf
• Badawy Ghada

Classifications

• H04W72/541

  using the level of interference · CPC title

• H04W28/0231 Primary

  based on communication conditions (dynamic wireless traffic scheduling definition based on channel quality criteria H04W72/54) · CPC title

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title

• H04W16/14

  Spectrum sharing arrangements {between different networks} · CPC title

• H04W52/243

  taking into account interferences · CPC title