Method and apparatus for packet aggregation in a wireless communication network

• US 7,120,852 B2
• Filed: 06/28/2004
• Issued: 10/10/2006
• Est. Priority Date: 06/27/2003
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Jokela, Jari, Terry, John
• Primary Examiner(s): Lamarre, Guy
• Assistant Examiner(s): Alphonse, Fritz
• Application Number:
  US10/880,379
• Publication Number:
  US 20050015703A1
• Time in Patent Office: 834 Days
• Field of Search: 714/752, 714/746, 714/747, 714/748, 714/749, 370/231, 370/242, 455/62, 455/450, 455/563
• US Class Current: 714/776
• CPC Class Codes: H04L 1/1685 the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 28/065 using assembly or disassembly of packets

Abstract

A method and apparatus for aggregating packets in a wireless communication system. The data to be transmitted is selected and packetized and formed into frames for transmission. Rather than send each frame individually, frames are grouped and transmitted with grouping indicia informing the recipients how to acknowledge successful receipt of the transmitted data. ACKs are sent at a predetermined time, or all together, divided by subcarrier in the case of an OFDMA network.

Claims

1. In a wireless communication system operable to communicate packetized data according to a channel access protocol, an improved method of communicating the data packets, said method comprising the steps of:

forming, in a transmitting station, the data to be transmitted into a plurality of packets;

selecting a group of packets for aggregate transmission from the plurality of packets;

creating grouping indicia associated with the selected packet group in the transmitting station, the grouping indicia being indicative of the recipients of each of the packets and identifying different recipients for at least two packets of the same packet group; and

assembling at least one transmission frame including the selected packet group and the grouping indicia.

2. The method of claim 1, wherein the data to be transmitted includes medium access control (MAC) layer headers having a plurality of fields, and further comprising the step of setting the MAC layer header fields.

3. The method of claim 1, wherein the data to be transmitted includes physical layer headers having a plurality of fields, and further comprising the step of setting the physical layer header fields.

4. The method of claim 1, further comprising the step of transmitting the transmission frame.

5. The method of claim 1, further comprising the step of receiving the transmission frame in at least one receiving station.

6. The method of claim 5, further comprising the step of determining, in the at least one receiving station, whether the received transmission frame includes grouping indicia.

7. The method of claim 6, further comprising the steps of:

decoding the received transmission frame; and

extracting from the decoded frame data addressed to the at least one receiving station.

8. The method of claim 7, further comprising the step of discarding extracted data, if any, that is not addressed to the at least one receiving station.

9. The method of claim 6, further comprising the step of generating, in the receiving station, an acknowledgment message (ACK).

10. The method of claim 9, further comprising the step of determining whether the grouping indicia includes ACK instructions prior to generating the ACK.

11. The method of claim 10, wherein the step of generating an ACK message is performed according to the ACK instructions, if any.

12. The method of claim 11, wherein the acknowledgment instructions include information relating to the timing of ACK transmission.

13. The method of claim 12, wherein the information relating to ACK timing is derived front the order in which data packets are assembled in the transmission frame.

14. The method of claim 11, wherein the wireless communication system is operable according to an orthogonal frequency division multiple access (OFDMA) protocol, and wherein the ACK instructions include an ACK subcarrier set assignment, wherein the ACK subcarrier set is a cluster including a subset of the subcarriers used for transmissions according to the OFDM protocol.

15. The method of claim 11, further comprising the step of receiving at least one ACK message from a receiving station.

16. The method of claim 15, wherein the at least one ACK message is a plurality of ACK messages.

17. The method of claim 16, wherein each of the plurality of ACK messages occupy a unique ACK subcarrier set.

18. The method of claim 17, further comprising the step of using a delay and correlate algorithm to detect the individual ACKs of the plurality of ACKs.

19. The method of claim 17, farther comprising the step of using a whiteness test to detect the individual ACKs of the plurality of ACKs.

20. In a radio station operable to communicate in a wireless communication system, an improvement of apparatus for the communication of data packets, said apparatus comprising:

a transmitter in a first wireless station;

a packet selector for determining which data packets are to be grouped together for transmission;

a grouping-information generator for generating indicia of the packet grouping, the grouping indicia being indicative of the recipients of each of the packets and identifying different recipients for at least two packets of the same packet group;

a transmission frame assembler for assembling a transmission frame including the selected packets and the grouping indicia;

wherein the assembled transmission frame is presented to the transmitter for transmission to at least a second wireless station.

21. The apparatus of claim 20, wherein the wireless communication system is a wireless local area network (WLAN).

22. The apparatus of claim 21, wherein the WLAN is operable according to an OFDMA protocol.

23. The apparatus of claim 22 wherein the first wireless station is a WLAN access point (AP).

24. The apparatus of claim 23, wherein the at least a second wireless station is a plurality of wireless stations.

25. The apparatus of claim 24, wherein the transmission frame includes packets addressed to different ones of the plurality of wireless stations.

26. In a wireless communication system operable to communicate packetized data according to a channel access protocol, an improved method of communicating the data packets, said method comprising:

forming the data to be transmitted into a plurality of packets;

selecting a group of packets for aggregate transmission from the plurality of packets;

creating grouping indicia associated with the selected packet group; and

assembling at least one transmission frame including the selected packet group and the grouping indicia,

wherein at least two of the data packets in the group of packets are intended for different recipients.