Method and apparatus for reducing transmission delay of down-link frame in wireless communication system

• US 20070189253A1
• Filed: 10/16/2006
• Published: 08/16/2007
• Est. Priority Date: 02/14/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Jin-Hyeock, Daley, Greg, Sekercioglu, Yasar Ahmet
• Granted Patent: US 8,040,908 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04W 72/1273 of downlink data flows
• CPC Class Codes: H04W 72/569 of the traffic information

Abstract

A method and apparatus for reducing a transmission delay of a downlink frame in a wireless communication system are provided. A frame transmission method in an access point (AP) includes classifying each of a plurality of hosts as any one of a normal destination and a suspect destination according to whether a retransmission is exhausted, and managing at least one frame to be transmitted to each of the normal destination and the suspect destination in a first queue and a second queue, and assigning at least one frame transmission attempt to the first queue and the second queue according to a transmission priority.

Claims

1. A frame transmission method comprising:

classifying each of a plurality of hosts as any one of a normal destination and a suspect destination according to whether a retransmission is exhausted; and

managing at least one frame to be transmitted to each of the normal destination and the suspect destination in a first queue and a second queue, and assigning at least one frame transmission attempt to the first queue and the second queue according to a transmission priority.

2. The method of claim 1, wherein the retransmission is exhausted when a transmission of the at least one frame which is transferred to the first queue fails during an initial cycle and a retransmission of the at least one frame fails during a number of cycles.

3. The method of claim 1, wherein the transmission priority is determined based on a round robin method.

4. The method of claim 3, wherein the transmission priority comprises a priority where a weight is assigned to each of the first queue and the second queue.

5. The method of claim 1, wherein the frame transmission attempt is assigned to each of the frame managed in the first queue and the frame managed in the second queue, alternating for each cycle.

6. The method of claim 1, wherein a retransmission attempt is assigned to the frame managed in the first queue during a number of cycles, when the frame transmission attempt fails during an initial cycle, and

the frame transmission attempt is assigned to the frame managed in the second queue for only one cycle.

7. The method of claim 1, wherein the frame transmission method is applied to a wireless communication system in accordance with at least one of Institute of Electrical and Electronics Engineers (IEEE) 802.11, wireless local area network (WLAN), IEEE 802.16d/e, wireless broadband Internet (WiBro), and World Interoperability for Microwave Access (WiMAX).

8. A frame transmission method comprising:

transferring at least one frame to be transmitted to a normal destination comprising a host which maintains a first communication, to a first queue;

transferring at least one frame to be transmitted to a suspect destination that is a host which maintains a second communication, the first communication quality being better than the second communication quality, to a second queue;

performing a transmission attempt with respect to the frame of the first queue; and

performing the transmission attempt with respect to the frame of the second queue, before or after performing the transmission attempt with respect to the frame of the first queue.

9. The method of claim 8, wherein the frame transmission method is utilized for transmitting a downlink frame in an access point (AP).

10. The method of claim 8, wherein each of a plurality of hosts attached to an AP is classified as any one of the normal destination and the suspect destination according to whether a retransmission is exhausted.

11. The method of claim 10, wherein the retransmission is exhausted when a transmission of the at least one frame which is transferred to the first queue fails during an initial cycle and a retransmission of the at least one frame fails during a number of cycles.

12. The method of claim 8, wherein at least one frame transmission attempt is assigned to the first queue and the second queue according to a transmission priority.

13. The method of claim 12, wherein the transmission priority is determined based on a round robin method.

14. The method of claim 8, wherein the frame transmission attempt is assigned to each frame managed in the first queue and the frame managed in the second queue, alternating for each cycle.

15. The method of claim 8, wherein a retransmission attempt is assigned to the frame managed in the first queue during a number of cycles, when the frame transmission attempt fails during an initial cycle, and

the frame transmission attempt is assigned to the frame managed in the second queue for only one cycle.

16. The method of claim 8, wherein the frame transmission method is applied to a wireless communication system in accordance with at least one of Institute of Electrical and Electronics Engineers (IEEE) 802.11, wireless local area network (WLAN), IEEE 802.16d/e, wireless broadband Internet (WiBro), and World Interoperability for Microwave Access (WiMAX).

17. A frame transmission apparatus comprising:

a primary queuing unit for managing at least one frame to be transmitted to a normal destination comprising a host which maintains a first communication, in a first queue, and transmitting the at least one frame; and

a retransmission queuing unit for managing at least one frame to be transmitted to a suspect transmission that is a host which maintains a second communication, the first communication quality being better than the second communication quality, in a second queue, and transmitting a frame managed in the second queue before or after the primary queuing unit performs the transmission attempt with respect to a frame of the first queue.

18. The frame transmission apparatus of claim 17, wherein the frame transmission apparatus is utilized for transmitting a downlink frame in an access point (AP).

19. The frame transmission apparatus of claim 17, further comprising:

a control unit for classifying each of a plurality of hosts attached to an AP as any one of the normal destination and the suspect destination according to whether a retransmission is exhausted.

20. The frame transmission apparatus of claim 19, wherein the retransmission is exhausted when a transmission of the at least one frame which is transferred to the first queue fails during an initial cycle and a retransmission of the at least one frame fails during a number cycles.

21. The frame transmission apparatus of claim 19, wherein the control unit assigns at least one frame transmission attempt to the first queue and the second queue according to a transmission priority.

22. The frame transmission apparatus of claim 21, wherein the transmission priority is determined based on a round robin method.

23. The frame transmission apparatus of claim 21, wherein the transmission priority comprises a priority where a weight is assigned to each of the first queue and the second queue.

24. The frame transmission apparatus of claim 19, wherein the control unit assigns the frame transmission attempt to each of the frame managed in the first queue and the frame managed in the second queue, alternating for each cycle.

25. The frame transmission apparatus of claim 19, wherein the control unit assigns a retransmission attempt with respect to the frame managed in the first queue during a number of cycles, when the frame transmission attempt fails during an initial cycle, and assigns the transmission attempt to the frame managed in the second queue for only one cycle.

26. The frame transmission apparatus of claim 17, wherein the frame transmission apparatus is applied to a wireless communication system in accordance with at least one of Institute of Electrical and Electronics Engineers (IEEE) 802.11, wireless local area network (WLAN), IEEE 802.16d/e, wireless broadband Internet (WiBro), and World Interoperability for Microwave Access (WiMAX).