Full-duplex capacity allocation for OFDM-based communication

• US 9,240,913 B2
• Filed: 07/31/2012
• Issued: 01/19/2016
• Est. Priority Date: 03/23/2012
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Hui, Jonathan W., Vasseur, Jean-Philippe, Hong, Wei
• Primary Examiner(s): Lai, Andrew
• Assistant Examiner(s): Qin, Zhiren
• Application Number:
  US13/563,564
• Publication Number:
  US 20130250866A1
• Time in Patent Office: 1,267 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 2203/5416 by adding signals to the wave form of the power source
• CPC Class Codes: H04B 3/54 Systems for transmission via power distribution lines
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0033 each allocating device acting autonomously, i.e. without negotiation with other allocating devices
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In one embodiment, device determines a quantity of subcarriers available for data frame transmission and data frame receipt based on information included in an acknowledgement data frame. The device transmits a first data frame over at least one of the subcarriers and includes information associated with one or more additional data frames pending transmission. The device then receives a second data frame, subsequent to transmission of the first data frame, and determines a quantity of subcarriers available for transmission of the one or more additional data frames pending transmission based on the information included in the second data frame.

Claims

1. A method, comprising:

transmitting a first data frame, with a transmitter of a first device, along at least one of a plurality of subcarriers, the first data frame including information associated with one or more additional data frames pending transmission by the transmitter;

receiving a second data frame, with a receiver of the first device, subsequently to the first data frame, the second data frame including information regarding any pending data frames enqueued to be sent to the receiver by one or more other devices; and

dynamically selecting, by a processor of the first device, whether to transmit the one or more additional frames in half-duplex mode or in full-duplex mode based on the information included in the received second data frame, wherein the first device selects a subset of the plurality of subcarriers to transmit the additional frames when full-duplex mode is selected and the selected subset of the plurality of subcarriers do not overlap subcarriers used by the one or more other devices for transmitting, wherein the first device selects the entire plurality of subcarriers to transmit the additional frames when half-duplex mode is selected, and wherein the first device selects half-duplex mode in response to the information included in the received second data frame indicating that there are no pending data frames enqueued to be sent to the receiver of the first device by the one or more other devices.

2. The method of claim 1, wherein the information included in the first data frame includes one or more of a quantity, a priority, or a size of the additional data frames pending transmission by the transmitter.

3. The method of claim 1, further comprising determining, with the processor, a quantity of subcarriers available for receipt of any of the pending data frames enqueued to be sent to the receiver by the one or more other devices based on the information included in the first data frame and the information included in the second data frame.

4. The method of claim 3, further comprising adjusting, with the processor, a quantity of subcarriers available for transmission by the first device and a quantity of subcarriers available for receipt by the first device based on the information included in the first data frame and the information included in the second data frame, wherein the quantity of subcarriers for transmission by the first device is selected so as to not overlap subcarriers used to receive the pending data frames enqueued to be sent to the receiver by the one or more other devices.

5. The method of claim 1, wherein the information included in the second data frame includes one or more of a quantity, a priority, or a size of the data frames enqueued to be sent to the receiver by the one or more other devices.

6. The method of claim 1, wherein the second data frame is received after transmission of the first data frame is completed.

7. The method of claim 1, wherein the second data frame is received during the transmission of the first data frame in full-duplex mode.

8. The method of claim 7, wherein the second data frame contains an indication that one or more additional data frames are critical and transmission of the first data frame is interrupted to allow receipt of the pending data frames enqueued to be sent to the receiver by one or more other devices in half-duplex mode.

9. An apparatus, comprising:

a transmitter configured to transmit one or more data frames over a network using a plurality of subcarriers;

a receiver configured to receive one or more data frames over the network using the plurality of subcarriers;

a processor configured to communicate with the transmitter and the receiver;

a memory configured to communicate with the processor, the memory having instructions stored thereon that, in response to execution by the processor, cause the processor to perform operations comprising;

transmitting a first data frame over at least one of the subcarriers, the first data frame including information associated with one or more additional data frames pending transmission by the transmitter;

receiving a second data frame subsequent to transmission of the first data frame, the second data frame including information regarding any pending data frames enqueued to be sent to the receiver by one or more other devices; and

dynamically selecting whether to transmit the one or more additional frames in half-duplex mode or in full-duplex mode based on the information included in the received second data frame, wherein the processor selects a subset of the plurality of subcarriers to transmit the additional frames when full-duplex mode is selected and the selected subset of the plurality of subcarriers do not overlap subcarriers used by the one or more other devices for transmitting, wherein the apparatus selects the entire plurality of subcarriers to transmit the additional frames when half-duplex mode is selected, and wherein the apparatus selects half-duplex mode in response to the information included in the received second data frame indicating that there are no pending data frames enqueued to be sent to the receiver of the first device by the one or more other devices.

10. The apparatus of claim 9, wherein the information included in the first data frame includes one or more of a quantity, a priority, or a size of the additional data frames pending transmission by the transmitter.

11. The apparatus of claim 9, wherein the processor determines a quantity of subcarriers available for data frame receipt of any of the pending data frames enqueued to be sent to the receiver by one or more other devices based on the information included in the first data frame and the information included in the second data frame.

12. The apparatus of claim 9, wherein the processor adjusts the quantity of subcarriers available for data frame transmission and data frame receipt based on the information included in the first data frame and the information included in the second data frame, wherein the quantity of subcarriers for transmission is selected so as to not overlap subcarriers used to receive the pending data frames enqueued to be sent to the receiver by the one or more other devices.

13. The apparatus of claim 9, wherein the information included in the second data frame includes one or of a quantity, a priority, or a size of data frames enqueued to be sent to the receiver by the one or more other devices.

14. The apparatus of claim 9, wherein the second data frame is received after transmission of the first data frame is completed.

15. The apparatus of claim 9, wherein the second data frame is received during the transmission of the first data frame in full-duplex mode.

16. The apparatus of claim 9, wherein the second data frame contains an indication that one or more additional data frames are critical and transmission of the first data frame is interrupted to allow receipt of the pending data frames enqueued to be sent to the receiver by one or more other devices in half-duplex mode.

17. A tangible non-transitory computer-readable medium having computer executable instructions stored thereon that, when executed by a first device, cause the first device to perform a method comprising:

transmitting a first data frame over at least one of a plurality of subcarriers, the data frame including information associated with one or more additional data frames pending transmission;

receiving a second data frame, subsequent to transmission of the first data frame, the second data frame including information regarding any pending data frames enqueued to be sent to a receiver of the first device by one or more other devices; and

dynamically selecting whether to transmit the one or more additional frames in half-duplex mode or in full-duplex mode based on the information included in the received second data frame, wherein the first device selects a subset of the plurality of subcarriers to transmit the additional frames when full-duplex mode is selected and the selected subset of the plurality of subcarriers do not overlap subcarriers used by the one or more other devices for transmitting, wherein the first device selects the entire plurality of subcarriers to transmit the additional frames when half-duplex mode is selected, and wherein the first device selects half-duplex mode in response to the information included in the received second data frame indicating that there are no pending data frames enqueued to be sent to the receiver of the first device by the one or more other devices.

18. The computer-readable medium of claim 17, wherein the method further comprises determining a quantity of subcarriers available for receipt of the pending data frames enqueued to be sent to the receiver by the one or more other devices the based on the information included in the first data frame and the information included in the second data frame.

19. The computer-readable medium of claim 17, wherein the method further comprises adjusting a quantity of sub carriers available for transmission and a quantity of subcarriers available for receipt based on the information included in the first data frame and the information included in the second data frame, wherein the quantity of subcarriers for transmission is selected so as to not overlap subcarriers used to receive the pending data frames enqueued to be sent to the receiver by the one or more other devices.

20. The computer-readable medium of claim 17, wherein the second data frame is received during the transmission of the first data frame, the second data frame contains an indication that one or more additional data frames are critical, and transmission of the first data frame is interrupted to allow receipt of the pending data frames enqueued to be sent to the receiver by one or more other devices in half-duplex mode.