Reducing interference in collocated radios

• US 9,357,433 B2
• Filed: 09/30/2011
• Issued: 05/31/2016
• Est. Priority Date: 09/30/2011
• Status: Active Grant

• Current Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Original Assignee: Intel Corporation
• Inventors: Tarradell, Marta M., Chen, Sherry
• Primary Examiner(s): Gidado, Rasheed
• Application Number:
  US13/976,601
• Publication Number:
  US 20150296412A1
• Time in Patent Office: 1,705 Days
• Field of Search: 370/328, 370/338
• US Class Current: 1/1
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/1215 for collaboration of different radio technologies
• CPC Class Codes: H04W 74/085 collision avoidance
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

Technology for reducing interference in collocated radios is disclosed. One method comprises logging transmit/receive information from a Bluetooth radio and an OFDMA radio for a repeating Tx/Rx pattern. Data collisions between the radios are identified. A persistent reservation is requested in the OFDMA radio for collisions in the repeating Tx/Rx pattern. A repeating Bluetooth Tx/Rx pattern is derived from the logged data and the collision data. Bluetooth radio communication is accomplished using the Bluetooth Tx/Rx pattern.

Claims

1. A method for reducing interference in collocated radios of a multi-radio mobile communication device, comprising:

logging transmit/receive (Tx/Rx) information for a Bluetooth radio and an Orthogonal Frequency Division Multiple Access (OFDMA) radio for a time equivalent to T consecutive Bluetooth intervals, where T is a repeating Tx/Rx pattern length;

identifying if at least one of a Bluetooth packet collision and an OFDMA data collision occur from the logged data for the T Bluetooth intervals;

requesting a persistent reservation of at least one OFDMA radio subframe, wherein the OFDMA radio will not schedule data to allow a Bluetooth packet to be transmitted during an interval where the Bluetooth packet collision or the OFDMA data collision can occur;

determining a repeating Bluetooth Tx/Rx pattern of length T, wherein the pattern comprises a transmit slot number for each Bluetooth packet and a persistent reservation transmit slot number for each Bluetooth packet collision or OFDMA data collision; and

communicating using the Bluetooth radio based on the repeating Bluetooth Tx/Rx pattern to enable reduced interference between the Bluetooth radio and the OFDMA radio in a multi-radio mobile communication device.

2. The method of claim 1, wherein the Tx/Rx pattern is comprised of A_i coefficients, wherein i is an integer number that represents an interval number within T possible intervals, and the A_i coefficients are used to determine a behavior of the Bluetooth radio in each moment of time using the algorithm:

3. The method of claim 1, wherein the OFDMA radio is configured to communicate using Time Division Duplexing (TDD) and is one of a Third Generation Partnership Project Long Term Evolution (3GPP LTE) radio and a Worldwide Interoperability for Microwave Access (WiMAX) radio.

4. The method of claim 1, wherein logging the Tx/Rx information further comprises:

logging a start time and a stop time, a packet collision status, and a delay time for of each Bluetooth interval; and

logging a start time, a stop time, and a data error rate for each OFDMA sub-frame.

5. The method of claim 1, further comprising logging the (Tx/Rx) information for the Bluetooth radio and the OFDMA radio for T consecutive intervals, wherein each interval is an extended Synchronous Connection Oriented (eSCO) packet and T=8.

6. The method of claim 1, wherein requesting the persistent reservation further comprises determining if a retransmission of data in the Bluetooth packet can occur at other transmission slots in the Bluetooth interval without a collision occurring for a predetermined number of retransmission attempts.

7. The method of claim 6, further comprising incrementing the transmission slot number by two slots and determining if the incremented transmission slot collides with the OFDMA radio for the predetermined number of retransmission attempts.

8. The method of claim 1, wherein requesting the persistent reservation further comprises identifying the at least one subframe from the OFDMA radio that synchronizes with the persistent reservation transmit slot in the Bluetooth packet, wherein no transmission from the at least one subframe will occur during the persistent reservation transmission slot in the Bluetooth packet.

9. The method of claim 1, wherein the Bluetooth radio continues to communicate using the repeating Bluetooth Tx/Rx pattern until the OFDMA radio changes a data allocation.

10. The method of claim 1, further comprising identifying an updated repeating Bluetooth Tx/Rx pattern after a transmission timer value is reached.

11. The method of claim 10, further comprising increasing the transmission timer value when a number of packet collisions is greater than a selected threshold.

12. The method of claim 10, further comprising decreasing the transmission timer value when a number of packet collisions is less than a selected threshold.

13. A computer program product, comprising a non-transitory computer readable storage medium having a computer readable program code embodied therein, the computer readable program code adapted to be executed to implement the method of claim 1.

14. A radio coexistence system, comprising:

a wireless coexistence controller module in a mobile communication device that is operable to communicate with a Bluetooth radio configured to communicate a packet over a selected interval and an Orthogonal Frequency Division Multiple Access (OFDMA) radio configured to communicate using Time Division Duplexing (TDD), wherein the wireless coexistence controller module is comprised of code that is located in one or more digital memory devices to be executed by one or more processors or the wireless coexistence controller module is implemented in one or more hardware circuits;

a data logging module configured to log transmit/receive (Tx/Rx) information for the Bluetooth radio and the OFDMA radio for a time equivalent to T Bluetooth intervals, where T is a repeating Bluetooth Tx/Rx pattern length, wherein the data logging module is comprised of code that is located in one or more digital memory devices to be executed by one or more processors or the data logging module is implemented in one or more hardware circuits;

a persistent reservation module configured to request a persistent reservation of at least one OFDMA radio subframe, wherein the OFDMA radio will not schedule data at the interval when the logged data indicates at least one of a Bluetooth packet collision and an OFDMA data collision occurred, to allow a Bluetooth packet to be transmitted,

wherein the persistent reservation module is comprised of code that is located in one or more digital memory devices to be executed by one or more processors or the persistent reservation module is implemented in one or more hardware circuits; and

wherein the wireless coexistence controller module is configured to modify the repeated Bluetooth Tx/Rx pattern based on the persistent reservation and operate the Bluetooth radio based on the modified repeated Bluetooth Tx/Rx pattern.

15. The system of claim 14, wherein the repeated Bluetooth Tx/Rx pattern has A_i coefficients, where i is an integer number that represents an interval number within T possible intervals, and the A_i coefficients are used to determine a behavior of the Bluetooth radio in each moment of time using the algorithm:

16. The system of claim 14, wherein the OFDMA radio is one of a Third Generation Partnership Project Long Term Evolution (3GPP LTE) radio or a Worldwide Interoperability for Microwave Access (WiMAX) radio.

17. The system of claim 14, wherein the Bluetooth radio, the OFDMA radio, the wireless coexistence controller module, and the persistent reservation module are all integrated in a single wireless device.

18. The system of claim 14, wherein the wireless coexistence controller module and the persistent reservation module are integrated in at least one of the Bluetooth radio and the OFDMA radio.

19. The system of claim 14, wherein the Bluetooth radio is configured to transmit the packet over the selected interval, wherein the interval is an extended Synchronous Connection Oriented (eSCO) packet length.

20. The system of claim 14, wherein the data logging module is configured to log information including:

a start time and a stop time, a packet collision status, and a delay time for each Bluetooth packet; and

a start time, a stop time, and a data error rate for each OFDMA sub-frame.

21. The system of claim 20, wherein the persistent reservation module is configured to:

determine if a Bluetooth data packet and OFDMA data will collide based on the start time and stop time of each Bluetooth packet interval and each OFDMA sub-frame; and

increment a transmission in the Bluetooth data packet to a next transmission slot until the collision will not occur, for a predetermined number of retransmission attempts; and

communicate the transmission slot wherein the Bluetooth data packet does not collide to the wireless coexistence controller module to modify the repeated Bluetooth Tx/Rx pattern based on the persistent reservation.

22. The system of claim 14, wherein the mobile communication device is configured to connect to at least one of a wireless local area network (WLAN), a wireless personal area network (WPAN), and a wireless wide area network (WWAN), wherein the mobile communication device includes an antenna, a touch sensitive display screen, a speaker, a microphone, a graphics processor, an application processor, internal memory, a non-volatile memory port, or combinations thereof.

23. A method for reducing interference in collocated radios, comprising:

identifying a repeating transmit/receive (Tx/Rx) pattern for multiple radios located in a mobile communication device having a Bluetooth radio collocated with an Orthogonal Frequency Division Multiple Access (OFDMA) radio;

logging Tx/Rx information for the Bluetooth radio and the OFDMA radio for T consecutive Bluetooth packet intervals, where T is a length of the Tx/Rx pattern;

identifying if at least one of a Bluetooth packet collision and an OFDMA data collision occurs from the logged data for the T Bluetooth packet intervals;

requesting a persistent reservation of at least one OFDMA subframe, wherein the OFDMA radio will not schedule data to allow a Bluetooth packet to be transmitted during the interval where the Bluetooth packet collision or the OFDMA data collision occurred;

modifying the repeating Tx/Rx pattern based on the persistent reservation; and

communicating using the Bluetooth radio based on the modified repeating Bluetooth Tx/Rx pattern to enable interference free communication for the Bluetooth radio and the OFDMA radio in a multi-radio mobile communication device.

24. The method of claim 23, wherein the Tx/Rx pattern is comprised of A_i coefficients, wherein i=T, and the A_i coefficients are used to determine a behavior of the Bluetooth radio in each moment of time using the algorithm:

25. The method of claim 23, wherein the OFDMA radio is one of a Third Generation Partnership Project Long Term Evolution (3GPP LTE) radio or a Worldwide Interoperability for Microwave Access (WiMAX) radio.

26. The method of claim 23, wherein requesting the persistent reservation further comprises determining if a retransmission of data in the Bluetooth packet can occur at other transmission slots in the Bluetooth eSCO packet without a collision occurring for a predetermined number of retransmission attempts.

27. The method of claim 26, further comprising incrementing the transmission slot number by two slots and determining if the incremented transmission slot collides with the OFDMA radio for the predetermined number of retransmission attempts.

28. The method of claim 23, wherein requesting the persistent reservation further comprises identifying the at least one subframe from the OFDMA radio that synchronizes with a persistent reservation transmit slot in the Bluetooth packet, wherein no transmission from the at least one subframe will occur during the persistent reservation transmission slot in the Bluetooth packet.

29. A computer program product, comprising a non-transitory computer readable storage medium having a computer readable program code embodied therein, the computer readable program code adapted to be executed to implement the method of claim 23.