Bluetooth low energy module systems and methods

• US 9,185,652 B2
• Filed: 12/22/2011
• Issued: 11/10/2015
• Est. Priority Date: 12/22/2011
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Xie, Guoxin, Zhuang, Yuan, Polo, Angel, Kwan, Chikan, Tian, Cindy (Xin), Jin, Arthur, Wang, Long
• Primary Examiner(s): Kim, Wesley
• Assistant Examiner(s): CHAKRABORTY, RAJARSHI
• Application Number:
  US13/334,205
• Publication Number:
  US 20130165044A1
• Time in Patent Office: 1,419 Days
• Field of Search: 455/41.1, 455/41.2, 455/418, 455/419, 358/1.15
• US Class Current: 1/1
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Disclosed are various embodiments of Bluetooth low energy (BLE) modules and methods implemented therein. An embodiment of the disclosure can obtain in a BLE module an advertiser packet transmitted by a BLE advertiser. An advertiser cache can be checked to determine whether the advertiser cache in the BLE module contains an entry associated with an advertiser address from the advertiser packet. The BLE module can determine whether a payload value of the advertiser packet has changed relative to a previous advertiser packet associated with the advertiser address. The BLE module can then suppress forwarding of the packet to a host processor and/or on-board processor executing firmware. The BLE module can also suppress sending a scan request packet back to the BLE advertiser.

Claims

1. A method comprising:

obtaining an advertiser packet transmitted by a Bluetooth low energy (BLE) advertiser in a BLE module in a host device;

determining, in the BLE module, whether an advertiser cache in the BLE module contains an entry associated with an advertiser address from the advertiser packet;

comparing, in the BLE module, an error checking field extracted from the advertiser packet with a cached error checking field extracted from a previously received advertiser packet associated with the advertiser address;

when the error checking field equals the cached error checking field;

incrementing, in the BLE module, a counter corresponding to a number of consecutive advertiser packets received that are associated with the advertiser address and contain the error checking field,

suppressing, in the BLE module, sending of a scan request packet in response to the advertiser packet,

suppressing, in the BLE module, forwarding the advertiser packet to a processor of the host device when the counter does not exceed a threshold, and

forwarding, in the BLE module, the advertiser packet to the processor of the host device when the counter exceeds the threshold; and

when the error checking field does not equal the cached error checking field;

issuing, in the BLE module, the scan request packet in response to the advertiser packet,

replacing, in the BLE module, the cached error checking field with the error checking field extracted from the advertiser packet,

resetting, in the BLE module, the counter, and

forwarding, in the BLE module, the advertiser packet to the processor of the host device.

2. The method of claim 1, further comprising caching a pairing of the advertiser address and the error checking field from the advertiser packet in the advertiser cache.

3. The method of claim 2, wherein comparing the error checking field extracted from the advertiser packet with the cached error checking field further comprises:

extracting the error checking field from the advertiser packet; and

comparing the error checking field to the entry in the advertiser cache corresponding to the advertiser address.

4. The method of claim 1, further comprising:

determining whether a scan response packet associated with the BLE advertiser comprises data relevant to an application executed in the host device; and

issuing the scan request packet when the scan request packet comprises data relevant to the application.

5. The method of claim 1, wherein comparing the error checking field extracted from the advertiser packet with the cached error checking field is implemented in a transceiver associated with the BLE module.

6. The method of claim 1, wherein determining whether the advertiser cache in the BLE module contains the entry associated with the advertiser address from the advertiser packet and comparing the error checking field extracted from the advertiser packet with the cached error checking field are executed in one of a transceiver and firmware executed by a BLE module central processing unit (CPU).

7. A Bluetooth low energy module, comprising:

a transceiver configured to;

obtain an advertiser packet transmitted by a Bluetooth low energy (BLE) advertiser;

determine whether an advertiser cache in the BLE module contains a cached error checking field associated with an advertiser address from the advertiser packet;

determine whether an extracted error checking field of the advertiser packet has changed relative to the cached error checking field associated with the advertiser address;

increment a match counter when the extracted error checking field is unchanged, the match counter corresponding to a number of consecutive advertiser packets received that are associated with the advertiser address and comprise the cached error checking field;

forward the advertiser packet to at least one processor executing a firmware when the extracted error checking field is unchanged and the match counter satisfies a threshold; and

suppress sending of a scan request packet in response to the advertiser packet when the extracted error checking field of the advertiser packet is unchanged, otherwise issuing the scan request packet in response to the advertiser packet when the extracted error checking field of the advertiser packet is changed.

8. The BLE module of claim 7, wherein the transceiver is further configured to suppress forwarding of the advertiser packet to at least one processor executing firmware when the extracted error checking field of the advertiser packet is unchanged.

9. The BLE module of claim 7, wherein the transceiver is further configured to cache a pairing of the advertiser address and the extracted error checking field from the advertiser packet in the advertiser cache.

10. The BLE module of claim 7, wherein the transceiver is further configured to determine whether the extracted error checking field of the advertiser packet has changed by:

extracting the error checking field from the advertiser packet; and

comparing the extracted error checking field to an entry in the advertiser cache corresponding to the advertiser address.

11. The BLE module of claim 7, wherein the transceiver is configured to:

determine whether a scan response packet associated with the BLE advertiser comprises data relevant to an application executed in a host device of the transceiver; and

issue the scan request packet when the scan request packet comprises data relevant to the application.

18. The BLE module of claim 7, wherein the transceiver is configured to forward the advertiser packet to the at least one processor executing the firmware when the extracted error checking field is changed relative to the cached error checking field associated with the advertiser address.

12. A non-transitory computer readable medium having a program that, when executed by processing circuitry, causes the processing circuitry to:

obtain an advertiser packet transmitted by a Bluetooth low energy (BLE) advertiser;

determine whether an advertiser cache in a BLE module contains an entry associated with an advertiser address from the advertiser packet;

determine whether a payload value of the advertiser packet has changed relative to a cached payload value of a previous advertiser packet associated with the advertiser address;

suppress sending of a scan request packet in response to the advertiser packet when the payload value of the advertiser packet is unchanged relative to the cached payload value of the previous advertiser packet associated with the advertiser address;

forward the advertiser packet to a processor executing a firmware in response to determining that the advertiser packet is unchanged relative to the cached payload value of the previous advertiser packet associated with the advertiser address and in response to determining that a counter corresponding to a number of consecutive advertiser packets received that are associated with the advertiser address and contain the payload value exceeds a threshold; and

reset the counter in response to determining that the payload value of the advertiser packet is changed relative to the cached payload value of the previous advertiser packet associated with the advertiser address.

13. The non-transitory computer readable medium of claim 12, wherein the program further causes the processing circuitry to suppress forwarding of the advertiser packet to the processor executing the firmware in response to determining that the payload value of the advertiser packet is unchanged and the number of consecutive advertiser packets received that are associated with the advertiser address and contain the payload value do not satisfy the threshold.

14. The non-transitory computer readable medium of claim 12, wherein the program further causes the processing circuitry to cache a pairing of the advertiser address and an error checking field from the advertiser packet in the advertiser cache.

15. The non-transitory computer readable medium of claim 14, wherein the program further causes the processing circuitry to determine whether the payload value of the advertiser packet has changed by causing the processing circuitry to:

extract the error checking field from the advertiser packet; and

compare the error checking field to the entry in the advertiser cache corresponding to the advertiser address.

16. The non-transitory computer readable medium of claim 12, wherein the program further causes the processing circuitry to forward the advertiser packet to the processor executing the firmware in response to determining that the advertiser packet is changed relative to the cached payload value of the previous advertiser packet associated with the advertiser address.

17. The non-transitory computer readable medium of claim 12, wherein the program further causes the processing circuitry to issue the scan request packet in response to the advertiser packet in response to determining that the payload value of the advertiser packet is changed relative to the cached payload value of the previous advertiser packet associated with the advertiser address.

19. The non-transitory computer readable medium of claim 12, wherein the program further causes the processing circuitry to determine whether a scan response packet associated with the BLE advertiser comprises data relevant to an application executed in a host device and issue the scan request packet in response to determining that the scan request packet comprises data relevant to the application.

20. The non-transitory computer readable medium of claim 15, wherein a transceiver associated with the BLE module comprises the processing circuitry that is configured to compare the error checking field to the entry in the advertiser cache corresponding to the advertiser address.