Low rate data communication

• US 9,462,575 B2
• Filed: 08/25/2014
• Issued: 10/04/2016
• Est. Priority Date: 08/28/2013
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Vermani, Sameer, Tian, Bin, Tandra, Rahul, Sampath, Hemanth, Merlin, Simone
• Primary Examiner(s): CHAN, SAI MING
• Application Number:
  US14/467,894
• Publication Number:
  US 20150063334A1
• Time in Patent Office: 771 Days
• Field of Search: 370/338
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0011 applied to payload information
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 1/0075 Transmission of coding parameters to receiver H04L1/0023 takes precedence
• CPC Class Codes: H04L 1/04 using frequency diversity
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/189 Transmission or retransmission of more than one copy of a message
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

A method includes generating a data packet at a source device for transmission via an Institute of Electrical and Electronics Engineers 802.11 wireless network. The data packet includes multiple data symbols that are duplicated in the data packet. At least a portion of a preamble of the data packet is not duplicated in the data packet. The portion of the preamble indicates that the packet is a low rate mode packet. The method also includes transmitting the data packet from the source device to a destination device via the wireless network.

Claims

1. A method of communicating a packet, the method comprising:

generating, at a source device, a data packet for transmission via a wireless local area network, the data packet including a preamble and a data payload, the preamble including a first portion and a legacy preamble portion that precedes the first portion, wherein the first portion indicates that the data packet is a low rate packet, and wherein the data payload includes at least one data symbol that is duplicated multiple times in the data payload; and

transmitting the data packet from the source device to a destination device via the wireless network.

2. The method of claim 1, wherein the at least one data symbol is duplicated over multiple sub-bands of a frequency band associated with the data packet or over multiple time periods associated with the data packet.

3. The method of claim 1, wherein the data packet is communicated using a first number of tones that is greater than a second number of tones used to communicate an Institute of Electrical and Electronics Engineers (IEEE) 802.11a data packet, an IEEE 802.11g data packet, or an IEEE 802.11n data packet.

4. The method of claim 1, wherein the legacy preamble portion includes a particular preamble that complies with Institute of Electrical and Electronics Engineers (IEEE) 802.11a, IEEE 802.11g, or IEEE 802.11n.

5. The method of claim 3, wherein the data packet is communicated using a twenty megahertz (MHz) frequency band.

6. The method of claim 5, wherein the first number of tones corresponds to two-hundred fifty six tones.

7. The method of claim 1, wherein the first portion includes a short training field, a long training field, and a signal field.

8. The method of claim 7, wherein a periodicity of the short training field indicates the low rate packet.

9. The method of claim 7, wherein an orthogonal sequence of the long training field indicates the low rate packet.

10. The method of claim 7, wherein the first portion corresponds to at least one of the short training field or the long training field, and wherein the first portion is not duplicated multiple times in the data packet.

11. The method of claim 1, wherein the data packet is communicated using a twenty megahertz (MHz) frequency band that is divided into a first number of tones that is greater than a second number of tones used to communicate a legacy data packet by a first factor, the legacy data packet configured to be communicated using a twenty MHz frequency band that is divided into the second number of tones, and wherein the legacy data packet comprises an Institute of Electrical and Electronics Engineers (IEEE) 802.11a data packet, an IEEE 802.11g data packet, an IEEE 802.11n data packet, or an IEEE 802.11ac data packet.

12. The method of claim 1, wherein the data packet is communicated using a five megahertz (MHz) frequency band that is divided into sixty-four tones.

29. The method of claim 11, wherein the data packet includes a short training field, and wherein the short training field of the data packet is transmitted using a number of tones, the number of tones is based on a second factor that is less than the first factor.

13. A non-transitory computer-readable medium comprising instructions that, when executed by a computer, cause the computer to perform operations comprising:

generating, at a source device, a data packet for transmission via a wireless local area network, the data packet including a preamble and a data payload, the preamble including a first portion and a legacy preamble portion that precedes the first portion, wherein the first portion indicates that the data packet is a low rate packet, and wherein the data payload includes at least one data symbol that is duplicated multiple times in the data payload; and

transmitting the data packet from the source device to a destination device via the wireless network.

14. The non-transitory computer-readable medium of claim 13, wherein the data packet is communicated using a twenty megahertz (MHz) frequency band.

15. The non-transitory computer-readable medium of claim 13, wherein the first portion includes a short training field, and wherein a periodicity of the short training field indicates the low rate packet.

16. The non-transitory computer-readable medium of claim 13, wherein the first portion includes a long training field, and wherein an orthogonal sequence of the long training field indicates the low rate packet.

17. The non-transitory computer-readable medium of claim 13, wherein a data rate of the data packet is between approximately 1.5 megabits per second (Mbps) and 1.625 Mbps.

18. The non-transitory computer-readable medium of claim 13, wherein data symbols of the data packet are binary phase shift keying (BPSK) modulated and coded at a first coding rate that is less than a legacy BPSK coding rate of an Institute of Electrical and Electronics Engineers (IEEE) 802.11a data packet, an IEEE 802.11g data packet, an IEEE 802.11n data packet, or an IEEE 802.11ac data packet.

19. The non-transitory computer-readable medium of claim 18, wherein the data symbols are communicated using two-hundred fifty-six tones.

20. The non-transitory computer-readable medium of claim 18, wherein the operations further comprise generating a second data packet for transmission in response to a determination that the destination device failed to acknowledge receipt of the data packet, and wherein data symbols of the second data packet are BPSK modulated and coded at a second coding rate that is less than the first coding rate.

30. The non-transitory computer-readable medium of claim 13, wherein the operations further comprise, after transmission of the data packet to the destination device, generating a second data packet for transmission in response to a determination that the destination device failed to acknowledge receipt of the data packet, and wherein second data symbols of the second data packet are coded at a second coding rate that is less than a first coding rate of the data symbols of the data packet.

21. An apparatus comprising:

a processor; and

a memory storing instructions executable by the processor to perform operations comprising;

generating, at a source device, a data packet for transmission via a wireless local area network, the data packet including a preamble and a data payload, the preamble including a first portion and a legacy preamble that precedes the first portion, wherein the first portion indicates that the data packet is a low rate packet, and wherein the data payload includes at least one data symbol that is duplicated multiple times in the data payload; and

transmitting the data packet from the source device to a destination device via the wireless network.

22. The apparatus of claim 21, wherein the data packet includes duplicated signal fields and data fields.

23. The apparatus of claim 21, wherein the data packet is communicated using tones having a smaller bandwidth than tones used to communicate a legacy data packet, and wherein a code rate for signal fields and data fields of the data packet is lower than a legacy code rate for the legacy data packet.

24. The apparatus of claim 21, wherein the data packet includes a long training field that includes more than two symbols, and wherein the long training field precedes a signal field in the data packet.

25. An apparatus comprising:

means for generating a data packet to be transmitted via a wireless local area network, the data packet including a preamble and a data payload, the preamble including a first portion and a legacy preamble portion that precedes the first portion, wherein the first portion indicates that the data packet is a low rate packet, and wherein the data payload includes at least one data symbol that is duplicated multiple times in the data payload; and

means for transmitting the data packet via the wireless network.

26. The apparatus of claim 25, wherein the legacy preamble portion is decodable by a legacy device to cause the legacy device to refrain from communication via the wireless local area network during a time period during which the data packet is communicated.

27. The apparatus of claim 26, wherein the wireless local area network comprises a high efficiency Wi-Fi (HEW) wireless network, and wherein the legacy device is compatible with an Institute of Electrical and Electronics Engineers (IEEE) 802.11a standard, an IEEE 802.11g standard, an IEEE 802.11n standard, or any combination thereof.

28. The apparatus of claim 25, wherein the first portion comprises a short training field, and wherein the preamble includes a second portion that is preceded by the first portion, the second portion comprising a long training field.