Reduced interframe spacing in a wireless transmission system
View Patent ↗Providing wireless transmission, where in a first transmission mode, transmitting a plurality of frames using a first interframe spacing interval. When in a second transmission mode, transmitting the plurality of frames using a second interframe spacing interval, wherein the second interframe spacing is less than the first interframe spacing.
1. A method for increasing throughput in a wireless transmission comprises:
transmitting a plurality of frames using a Reduced InterFrame Spacing (RIFS) interval, wherein the RIFS interval is less than a Short InterFrame Spacing (SIFS) interval, the transmitting of the plurality of frames using the RIFS interval includes:
sustaining an operating configuration of a physical (“PHY”) layer during transmission of the plurality of frames, wherein when a subsequent frame of the plurality of frames from a Medium Access Control (MAC) layer is delivered to the PHY layer while a preceding frame delivery is in process, buffering the subsequent frame until the PHY layer completes delivery of the preceding frame;
instructing a destination station to suppress responses to each transmitted frame of the plurality of frames; and
causing the PHY layer to transmit each frame of the plurality of frames at the RIFS interval.
2. The method of claim 1 , wherein the instructing a destination station to suppress responses to each transmitted frames of the plurality of frames comprises at least one of:
completely suppressing responses from the destination station; and
delaying responses from the destination station.
3. The method of claim 2 wherein the instructing a destination station to suppress responses to the each transmitted frame of the plurality of frames by:
an RIFS indicator carried by the each transmitted frame.
4. The method of claim 3 , wherein the RIFS indicator includes an ACK response instruction.
5. The method of claim 2 wherein the instructing a destination station to suppress responses to the each transmitted frame of the plurality of frames by:
transmitting an ACK response instruction to the destination station.
6. The method of claim 2 further comprising:
receiving a response based upon the instructing the destination station to suppress responses.
7. The method of claim 1 , further comprising:
when the subsequent frame is unavailable, releasing the operating configuration of the PHY layer.
8. A method for a device to transmit a plurality of frames over a wireless medium using a Reduced InterFrame Spacing (RIFS) interval being less than a Short InterFrame Spacing (SIFS) interval, the method comprising:
indicating a physical (PHY) layer of a transmitter as busy to sustain a PHY configuration of the transmitter during transmission of the plurality of frames, wherein the PHY configuration includes a coarse transmitter setup;
transmitting a frame through the PHY layer;
when an end of a delivery of the transmitted frame from a Medium Access Control (MAC) layer of the transmitter to the PHY layer is detected on the PHY layer, determining whether the MAC layer indicates that a subsequent frame of the plurality of frames is available for transmission; and
when the subsequent frame is available, initiating delivery of the subsequent frame from the MAC layer to the PHY layer for transmission before the end of delivery for the transmitted frame over the wireless medium by the PHY layer, wherein the subsequent frame is transmitted using the RIFS interval, wherein when the subsequent frame of the plurality of frames from the MAC layer is delivered to the PHY layer while a preceding frame delivery is in process, buffering the subsequent frame until the PHY layer has completed delivery of the preceding frame.
9. The method of claim 8 wherein the step of indicating the PHY layer as busy comprises asserting a PHY carrier sense signal to sustain the PHY configuration.
10. The method of claim 8 wherein delivery of the frame from the MAC layer to the PHY layer further comprises indicating the delivery with a MAC transmit frame signal.
11. The method of claim 8 wherein releasing the PHY layer includes the PHY layer placing a PHY carrier sense signal at a logic low.
12. The method of claim 8 wherein the plurality of frames include a frame fragment.
13. The method of claim 8 , further comprising:
when the subsequent frame is unavailable, releasing the PHY configuration of the PHY layer.
14. The method of claim 8 wherein the frame includes an RIFS indicator.
15. The method of claim 14 , wherein the RIFS indicator includes an ACK response instruction.
16. Apparatus for transmitting a plurality of frames over a wireless medium using a Reduced InterFrame Spacing (RIFS) interval being less than a Short InterFrame Spacing (SIFS) interval, each frame of the plurality of frames including a start-of-frame and an end-of frame, the apparatus functions to:
indicate a physical (PHY) layer as busy during a transmission of the plurality of frames to sustain a PHY layer configuration, wherein the PHY layer configuration includes a coarse transmitter setup;
transmit a first frame to a destination station,
when the end of the delivery of the transmitted frame from a Medium Access Control (MAC) layer to the PHY layer is detected on the PHY layer, determining whether a Medium Access Control (MAC) layer indicates that a subsequent frame is available for transmission on the PHY layer; and
when the MAC layer has data for transmission on the PHY layer, initiate delivery of the subsequent frame from the MAC layer to the PHY layer for transmission before the end of delivery of the first frame on the medium by the PHY layer, wherein the subsequent frame is transmitted using the RIFS interval, wherein when the subsequent frame of the plurality of frames from the MAC layer is delivered to the PHY layer while a preceding frame delivery is in process, buffering the subsequent frame until the PHY layer has completed delivery of the preceding frame.
17. The apparatus of claim 16 wherein the function to indicate the PHY layer as busy further prompts the apparatus to:
assert a PHY carrier sense signal.
18. The apparatus of claim 16 wherein the delivery of the frame from the MAC to the PHY layer further comprises:
indicating the delivery with a MAC transmit frame signal.
19. The apparatus of claim 16 wherein releasing the PHY layer includes the PHY layer placing a PHY carrier sense signal at a logic low.
20. The apparatus of claim 16 further functions to:
release the sustained PHY configuration of the PHY layer when the MAC layer does not have the subsequent frame for transmission on the PHY layer.