Method for bi-directional communication between source device and destination device during allocated channel time

• US 20060050728A1
• Filed: 09/02/2005
• Published: 03/09/2006
• Est. Priority Date: 09/03/2004
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Hong, Jin-woo, Sung, Hyun-ah, Bae, Dae-gyu
• Application Number:
  US11/217,322
• Publication Number:
  US 20060050728A1
• Time in Patent Office: Days
• US Class Current: 370/448
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 12/413 with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/085 collision avoidance

Abstract

A method and device for bidirectionally transmitting and receiving data during an allocated channel time using a CSMA/CA contention system are provided. The method includes receiving a first data frame from the destination device, transmitting an acknowledgement (ACK) to the destination device, checking whether a channel is idle for a predetermined waiting time, after the source device transmits the ACK to the destination device, and transmitting a second data frame to the destination device if a channel is idle for a predetermined waiting time.

Claims

1. A method of transmitting data from a source device to a destination device during an allocated channel time, the method comprising:

receiving a first data frame from the destination device;

transmitting an acknowledgement (ACK) to the destination device;

checking whether a channel is idle for a predetermined waiting time, after the source device transmits the ACK to the destination device; and

transmitting a second data frame to the destination device if the channel is idle for the predetermined waiting time.

2. The method of claim 1, wherein the predetermined waiting time is set to be longer than a retransmission interframe space (RIFS) defined according to IEEE 802.15.3.

3. The method of claim 1, wherein in the checking, clear channel assessment (CCA) capabilities of a physical (PHY) layer is used to check whether the channel is one of idle and busy.

5. The method of claim 1, wherein the predetermined waiting time is set to be longer than a time between successive frames, pPHYMIFSTime,.

4. A method of transmitting data from a source device to a destination device during an allocated channel time, the method comprising:

receiving a first data frame from the destination device;

checking whether a channel is idle for a predetermined waiting time, after the source device receives the first data frame from the destination device; and

transmitting a second data frame to the destination device if the channel is idle for the predetermined waiting time.

6. A method of transmitting data from a source device to a destination device during an allocated channel time, the method comprising:

receiving a first data frame from the destination device;

transmitting a first acknowledgement (ACK) for the first data frame to the destination device;

checking whether a channel is idle for a predetermined waiting time, after the source device transmits the first ACK to the destination device;

actuating a first backoff counter according to a backoff algorithm after the predetermined waiting time elapses; and

transmitting a second data frame to the destination device when the first backoff counter reaches zero.

7. The method of claim 6, wherein the predetermined waiting time is set to be longer than a retransmission interframe space (RIFS) defined according to IEEE 802.15.3.

8. The method of claim 6, further comprising:

receiving a second acknowledgement (ACK) for the second data frame;

actuating a second back off counter according to a backoff algorithm after receiving the second ACK; and

transmitting a third data frame to the source device when the second backoff counter reaches zero.

9. The method of claim 6, further comprising:

receiving a second acknowledgement (ACK) for the second data frame; and

transmitting a third data frame to the source device after receiving the second ACK and after short interframe sequence (SIFS) elapses.

10. The method of claim 6, wherein in the checking, clear channel assessment (CCA) capabilities'"'"' of a physical (PHY) layer is used to check whether the channel is one of idle and busy.

11. A method of transmitting data from a destination device to a source device during an allocated channel time, the method comprising:

receiving a first data frame from the source device;

checking whether a channel is idle for a predetermined waiting time, after the destination device receives the first data frame from the source device;

actuating a first backoff counter according to a backoff algorithm after the predetermined waiting time elapses; and

transmitting a second data frame to the source device when the first backoff counter reaches zero.

12. The method of claim 11, wherein the predetermined waiting time is set to be longer than a time between successive frames, pPHYMIFSTime.

13. The method of claim 11, further comprising:

actuating a second backoff counter according to a backoff algorithm after the destination device transmits the second data frame to the source device; and

transmitting a third data frame to the source device when the second backoff counter reaches zero.

14. The method of claim 11, further comprising transmitting a third data frame to the source device after a time between suceessive frames, pPHYMIFSTime, elapses after transmitting the second data frame.