SYSTEM AND METHOD FOR USING PARTIALLY RECEIVED PACKETS IN COEXISTING NETWORKS

• US 20120039329A1
• Filed: 02/15/2011
• Published: 02/16/2012
• Est. Priority Date: 02/15/2010
• Status: Abandoned Application

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: SUN, Yanjun, XHAFA, Ariton E., LU, Xiaolin, PEERY, Josef
• Application Number:
  US13/028,002
• Publication Number:
  US 20120039329A1
• Time in Patent Office: Days
• US Class Current: 370/345
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04W 72/1215 for collaboration of different radio technologies

Abstract

A system and method for using partially received packets in coexisting networks. In one embodiment, a wireless receiver includes an interference detector and a packet validator. The interference detector is configured to determine that time multiplexing of a coexisting wireless network interferes with reception of a packet by the wireless receiver. The packet validator is configured to identify a type of the packet and useable data values of the packet when a partial packet is received due to the time multiplexing. The packet validator is configured to identify the type and useable data values of the packet based on a packet signature stored in the wireless receiver.

Claims

1. A wireless receiver, comprising:

an interference detector configured to determine that time multiplexing of a coexisting wireless network interferes with reception of a packet by the wireless receiver;

a packet validator configured to identify a type of the packet and useable data values of the packet when a partial packet is received due to the time multiplexing;

wherein the packet validator is configured to identify the type and useable data values of the partial packet based on a packet signature stored in the wireless receiver.

2. The wireless receiver of claim 1, wherein the packet validator is configured to perform verification of the partial packet based on a check value included in the packet and corresponding to a portion of the partial packet, wherein the verification indicates that the portion of the partial packet is incorrupt.

3. The wireless receiver of claim 2, wherein the packet validator is configured to verify a header of the partial packet based on the check value.

4. The wireless receiver of claim 1, wherein the packet validator is configured to compare a predetermined value to a value of a given field of the partial packet, and to discard the partial packet if the value of the given field is not equal to the predetermined value.

5. The wireless receiver of claim 4, wherein the given field is one of a transmission rate field and a frame control type field.

6. The wireless receiver of claim 1, wherein the packet validator is configured to identify a portion of the packet that is received while the coexisting wireless network is not interfering with reception of the packet.

7. The system of claim 1, wherein the partial packet is a portion of a beacon packet transmitted by an access point and the packet validator is configured to identify a basic service set identifier of the access point based on the partial packet.

8. The system of claim 1, wherein the packet validator is configured to initiate a clear-to-send transmission that inhibits transmission of a subsequent packet until a time when the time multiplexing allows the subsequent packet to received in full, the initiation being based on failure to identify sufficient useable data values in the partial packet.

9. A method, comprising:

identifying, by a wireless device, a packet, received via a wireless network, whose reception is interfered with by time multiplexing of a coexisting wireless network, the interference resulting in reception of a partial packet;

comparing, by the wireless device, the partial packet to a stored packet signature;

identifying, by the wireless device, based on the comparing, a packet type and useable data values of the partial packet.

10. The method of claim 9, wherein the identifying useable data values comprises:

verifying a portion of the partial packet based on a check value included in the partial packet, wherein the check value is associated with the portion, and identifying fields of the portion as containing useable data values.

11. The method of claim 9, wherein the identifying useable data values comprises:

identifying a portion of the packet received while the coexisting wireless network is not interfering with reception of the packet; and

verifying fields included in the portion.

12. The method of claim 9, wherein the identifying useable data values comprises:

comparing a predetermined value to a value contained in the partial packet; and

discarding the partial packet based on the value contained in the partial packet being unequal to the predetermined value.

13. The method of claim 12, further comprising extracting the predetermined value from a packet transmitted on the wireless network and not addressed to the wireless device.

14. The method of claim 9, further comprising identifying an access point that transmitted the packet based on the useable data values, wherein only the partial packet is received.

15. The method of claim 9, further comprising:

determining that an insufficient number of useable data values are identifiable in the partial packet; and

scheduling a clear-to-send transmission that inhibits a transmission of a subsequent packet until a time when the time multiplexing allows the subsequent packet to be received in full by the wireless device.

16. A wireless transmitter, comprising:

a monitoring system configured to determine whether a transmission by the transmitter on a wireless network will be interfered with by time multiplexing of a coexisting wireless network;

a performance analyzer configured to determine whether transmission of partial packets on the wireless network is beneficial to performance of the wireless network; and

a transmission controller configured to transmit a packet that the monitoring system determines will be interfered with based on the performance analyzer determining that transmissions of partial packets are beneficial to performance of the wireless network.

17. The wireless transmitter of claim 16, wherein the performance analyzer is configured to:

analyze performance of the wireless network while transmitting partial packets;

analyze performance of the wireless network while not transmitting partial packets; and

determine whether transmission of partial packets is beneficial to the performance of the wireless network based on a comparison of network performance while transmitting partial packets to network performance while not transmitting partial packets.

18. A system, comprising:

a first wireless device configured to communicate via a first wireless network; and

a second wireless device configured to communicate with the first wireless device via the first wireless network, and configured to communicate with a third wireless device via a second wireless network;

the second wireless device, comprising;

a partial packet recognition system configured to;

validate a partial packet received from the first wireless device, wherein reception of the a packet comprising the partial packet is inhibited by time multiplexing of the first and second wireless networks; and

identify fields of the partial packet containing useable information.

19. The system of claim 18, wherein the partial packet recognition system is configured to determine an identity of the first wireless device based on the useable information.

20. The system of claim 18, wherein the partial packet consists of packet data received while the second wireless network is not interfering with reception of the packet.

21. The system of claim 18, wherein the partial packet recognition system is configured to validate the partial packet based on a check value included in the partial packet.

22. The system of claim 18, wherein the partial packet recognition system is configured to compare a predetermined value to a value contained in the partial packet, and to discard the partial packet if the value of the value contained in the partial packet is not equal to the predetermined value.

23. The system of claim 22, wherein the partial packet recognition system acquires the predetermined value based on a transmission between the first wireless device and a fourth wireless device that communicate via the first wireless network.

24. The system of claim 18, wherein the second wireless device comprises a transmitter and the partial packet recognition system is configured to direct the transmitter to transmit a clear-to-send signal that inhibits the first wireless device from transmitting on the first wireless network until the transmission can be received in full, the direction to transmit the clear-to-send being based on the partial packet recognition system being unable to identify a predetermined amount of useable information in the partial packet.

25. The system of claim 18, wherein the first wireless device comprises a transmitter configured to:

transmit on the first wireless network;

predict whether time multiplexing of the first and second networks will interfere with a next transmission on the first wireless network;

determine whether a portion of the transmission not interfered with by the time multiplexing is beneficial to performance of the first wireless network; and

initiate the next transmission based on the determination.

26. The system of claim 25, wherein the transmitter is configured to:

analyze network performance while transmitting partial packets; and

analyze network performance while not transmitting partial packets;

wherein the transmitter determines whether transmission of a partial packet is beneficial to the first wireless network based on a comparison of network performance while transmitting partial packets to network performance while not transmitting partial packets.

27. A method, comprising:

determining, by a wireless device, prior to initiation of transmission, whether transmission of a packet will be interrupted by time multiplexing of coexisting wireless networks;

determining, by the wireless device, whether reception of a partial packet resulting from transmission of the packet being interrupted by time multiplexing is beneficial to performance of a given wireless network on which the partial packet is transmitted; and

transmitting the partial packet based on the determining finding that the partial packet is beneficial to performance of the given wireless network.

28. The method of claim 27, wherein the determining whether reception of a partial packet is beneficial comprises:

analyzing performance of the given wireless network while transmitting partial packets;

analyzing performance of the given wireless network while not transmitting partial packets; and

determining whether transmission of partial packets is beneficial to the performance of the given wireless network based on a comparison of network performance while transmitting partial packets to network performance while not transmitting partial packets.

29. The method of claim 27, wherein the determining whether reception of a partial packet is beneficial comprises determining whether a portion of the packet that will transmitted prior to the transmission being interrupted contains data values that are useable by a receiving wireless device without a portion of the packet that will not be transmitted due to the time multiplexing.