Radio access technology co-existence using adaptive energy detection

Patent metadata

Field	Value
Publication number	US-9787569-B2
Application number	US-201514968563-A
Country	US
Kind code	B2
Filing date	Dec 14, 2015
Priority date	Dec 15, 2014
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

The disclosure provides for a method of interference detection using adaptive energy detection in unlicensed spectrum. The method can include a first modem operating according to a first radio access technology (RAT) receiving a message from a network entity operating according to the first RAT. The first modem sends a detected energy level value to a second modem that is using a second RAT, where the detected energy level value is based at least on the measured energy level of the received message. The second modem adjusts an energy detection threshold based on the detected energy level value received from the first modem. In an aspect, the first modem receives messages from a plurality of network entities operating according to the first RAT, where the detected energy level value is determined based on measured energy levels of the plurality of received messages.

First claim

The invention claimed is:

1. A method of wireless communication, comprising:
receiving, by a first modem operating according to a first radio access technology (RAT), a message from at least one network entity operating according to the first RAT, wherein the received message is detected by the first modem at a measured energy level;
receiving, by the first modem, a subsequent message from one of the at least one network entity or a distinct network entity different from the at least one network entity operating according to the first RAT;
sending, from the first modem to a second modem operating according to a second RAT different from the first RAT, a detected energy level value based at least on the measured energy level of the received message, wherein the subsequent message is detected by the first modem at a subsequent measured energy level, and the detected energy level value is determined based on the measured energy level of the received message and the subsequent measured energy level of the subsequent message; and
adjusting an energy detection threshold based on the detected energy level value received from the first modem.

2. The method of claim 1 , further comprising determining, by the second modem, that the detected energy level value is below a default energy detection threshold, wherein adjusting the energy detection threshold includes adjusting based on determining that the detected energy level value received from the first modem is below the default energy detection threshold.

3. The method of claim 1 , further comprising:
determining, by the second modem, an interference level in a communication channel based on the adjusted energy detection threshold.

4. The method of claim 1 , further comprising:
adjusting, by one of the first modem or the second modem, the energy detection threshold based on the detected energy level value.

5. The method of claim 1 , further comprising:
determining, by the first modem, a minimum measured energy level among a plurality of measured energy levels including the measured energy level and the subsequent measured energy level; and
setting, by the first modem, the determined minimum measured energy level as the detected energy level value.

6. The method of claim 1 , wherein sending the detected energy level value includes sending, by the first modern to the second modem, header information associated with one or both of the received message or the subsequent message.

7. The method of claim 6 , further comprising:
filtering, by one of the first modem or the second modem, the measured energy level and the subsequent measured energy level; and
determining, by one of the first modem or the second modem, the detected energy level value from the measured energy level associated with the received message and the subsequent measured energy level.

8. The method of claim 1 , further comprising:
waiting, by the first modem, for a defined period before the sending of the detected energy level value;
receiving, by the first modem, a subsequent message from the at least one network entity or a different network entity operating according to the first RAT during the defined period, wherein the subsequent message is detected by the first modem at a second measured energy level;
determining, by the first modem and in response to expiration of the defined period, the energy detection threshold based on the measured energy level of the received message and the second measured energy level of the received subsequent message; and
wherein the sending of the detected energy level value comprises sending in response to expiration of the defined period.

9. The method of claim 1 , wherein adjusting the energy detection threshold includes reducing the energy detection threshold based on the detected energy level value received from the first modem.

10. The method of claim 1 , wherein adjusting the energy detection threshold includes adjusting as a function of the detected energy level value.

11. The method of claim 1 , wherein the detected energy level value is a received signal strength indicator (RSSI) value of one or more decoded preambles over a defined time period.

12. The method of claim 1 , wherein the first RAT operates according to a wireless local area network and the second RAT operates according to a wireless wide area network.

13. The method of claim 1 , further comprising:
transmitting a transmission message including:
a first signature recognized by the at least one network entity operating according to the first RAT; and
a second signature recognized by one or more network entities operating according to the second RAT.

14. An apparatus for wireless communication, comprising:
a first modem configured to:
operate according to a first radio access technology (RAT),
receive a message from at least one network entity using the first RAT, wherein the received message is detected by the first modem at a measured energy level,
receive a subsequent message from one of the at least one network entity or a distinct network entity different from the at least one network entity operating according to the first RAT, and
send a detected energy level value based at least on the measured energy level of the received message, wherein the subsequent message is detected by the first modem at a subsequent measured energy level, and the detected energy level value is determined based on the measured energy level of the received message and the subsequent measured energy level of the subsequent message; and

a second modem configured to:
operate according to a second RAT different from the first RAT, and
adjust an energy detection threshold based on the detected energy level value received from the first modem.

15. The apparatus of claim 14 , wherein the second modem is further configured to determine that the detected energy level value is below a default energy detection threshold, and wherein the second modem is further configured to adjust the energy detection threshold based on determining that the detected energy level value received from the first modem is below the default energy detection threshold.

16. The apparatus of claim 14 , wherein the second modem is further configured to determine an interference level in a communication channel based on the adjusted energy detection threshold.

17. The apparatus of claim 14 , wherein one or both of the first modem or the second modem are configured to adjust the energy detection threshold based on the detected energy level value.

18. The apparatus of claim 14 , wherein the first modem is further configured to:
determine a minimum measured energy level among a plurality of measured energy levels including the measured energy level and the subsequent measured energy level; and
set the determined minimum measured energy level as the detected energy level value.

19. The apparatus of claim 14 , wherein to send the detected energy level value includes, the first modem is further configured to send header information associated with one or both of the received message or the subsequent message.

20. The apparatus of claim 19 , wherein one of the first modem or the second modem is configured to:
filter the measured energy level and the subsequent measured energy level; and
determine the detected energy level value from the measured energy level associated with the received message and the subsequent measured energy level.

21. The apparatus of claim 14 , wherein the first modem is further configur

Assignees

• Qualcomm Inc

Inventors

• Somasundaram Kiran Kumar
• Malladi Durga Prasad
• Luo Tao
• Damnjanovic Aleksandar
• Wei Yongbin
• Wang Qingsi
• Yerramalli Srinivas

Classifications

• H04W16/14

  Spectrum sharing arrangements {between different networks} · CPC title

• H04L1/0036 Primary

  arrangements specific to the receiver · CPC title

• H04W88/10

  adapted for operation in multiple networks, e.g. multi-mode access points · CPC title

• H04W74/08

  Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) · CPC title

• H04W88/06 Primary

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title