Wireless LAN protocol stack

• US 8,472,473 B2
• Filed: 10/13/2004
• Issued: 06/25/2013
• Est. Priority Date: 10/15/2003
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ketchum, John W., Walton, Jay Rodney, Nanda, Sanjiv
• Primary Examiner(s): PATEL, CHANDRAHAS B
• Application Number:
  US10/964,237
• Publication Number:
  US 20050135416A1
• Time in Patent Office: 3,177 Days
• Field of Search: 370/466, 370/469
• US Class Current: 370/466
• CPC Class Codes: H04L 1/1635 Cumulative acknowledgement, i.e. the acknowledgement message applying to all previous messages
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 47/2441 relying on flow classification, e.g. using integrated services [IntServ]
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/161 Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04L 69/32 Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
• CPC Class Codes: H04L 69/323 in the physical layer [OSI layer 1]
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04W 28/065 using assembly or disassembly of packets
• CPC Class Codes: H04W 80/02 Data link layer protocols
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Embodiments addressing MAC processing for efficient use of high throughput systems are disclosed. In one aspect, a protocol stack is disclosed comprising one or more of the following: an adaptation layer, a data link control layer, a physical layer, and a layer manager. In another aspect, physical layer feedback is used for adaptation layer processing. In one embodiment, physical layer feedback is used for segmentation. In another embodiment, physical layer feedback is used for multicast mapping onto one or more unicast channels. In another aspect, a data unit for transmission from a first station to a second station comprises zero or more complete sub-data units, zero or one partial sub-data units from a prior transmission, and zero or one partial sub-data units to fill the data unit. In one embodiment, a pointer may be used to indicate the location of any complete sub-data units.

Claims

1. A method for medium access control comprising:

receiving a packet addressed to a multicast group comprising two or more remote stations;

comparing a first resource allocation required for multicast transmission to the multicast group on a single channel with a second resource allocation required for unicast transmission to the multicast group on two or more channels; and

transmitting the packet on one channel when the first resource allocation is less than the second resource allocation, and transmitting the packet on two or more channels otherwise.

2. The method of claim 1, wherein:

the first resource allocation is determined based on a lowest supportable rate for a multicast channel receivable by each remote station in the multicast group; and

the second resource allocation is determined based on supportable rates for unicast channels receivable by each of the two or more channels.

3. The method of claim 2, wherein supportable rates are received as physical layer feedback.

4. The method of claim 1, further comprising:

determining, based on the comparison, whether unicast transmission is more efficient than multicast transmission.

5. The method of claim 1, further comprising:

receiving link parameters for each remote station in the multicast group; and

receiving link parameters for a multicast channel suitable for transmission to all remote stations in the multicast group.

6. The method of claim 5, wherein the comparing comprises comparing system resource requirements for multicast transmission of the packet to the multicast group on the multicast channel with system resource requirements for a sum of individual unicast transmissions of the packet to each of the remote stations in the multicast group.

7. The method of claim 1, wherein transmitting the packet on two or more channels otherwise comprises:

transmitting at least one multicast packet to a subset of the multicast group.

8. A non-transistory machine-readable medium comprising code, which, when executed by a machine, causes the machine to perform operations, the operations comprising:

receiving a packet addressed to a multicast group comprising two or more remote stations;

comparing a first resource allocation required for multicast transmission to the multicast group on a single channel with a second resource allocation required for unicast transmission to the multicast group on two or more channels; and

transmitting the packet on one channel when the first resource allocation is less than the second resource allocation, and transmitting the packet on two or more channels otherwise.

9. The machine-readable medium of claim 8, wherein:

the first resource allocation is determined based on a lowest supportable rate for a multicast channel receivable by each remote station in the multicast group; and

the second resource allocation is determined based on supportable rates for unicast channels receivable by each of the two or more channels.

10. The machine-readable medium of claim 9, wherein the operations further comprise receiving supportable rates as physical layer feedback.

11. The machine-readable medium of claim 8, wherein the operations further comprise:

determining, based on the comparison, whether unicast transmission is more efficient than multicast transmission.

12. The machine-readable medium of claim 8, wherein the operations further comprise:

receiving link parameters for each remote station in the multicast group; and

receiving link parameters for a multicast channel suitable for transmission to all remote stations in the multicast group.

13. The machine readable medium of claim 12, wherein the comparing comprises comparing system resource requirements for multicast transmission of the packet to the multicast group on the multicast channel with system resource requirements for a sum of individual unicast transmissions of the packet to each of the remote stations in the multicast group.

14. The machine readable medium of claim 8, wherein transmitting the packet on two or more channels otherwise comprises:

transmitting at least one multicast packet to a subset of the multicast group.

15. An apparatus comprising:

means for receiving a packet addressed to a multicast group comprising two or more remote stations;

means for comparing a first resource allocation required for multicast transmission to the multicast group on a single channel with a second resource allocation required for unicast transmission to the multicast group on two or more channels; and

means for transmitting the packet on one channel when the first resource allocation is less than the second resource allocation, and transmitting the packet on two or more channels otherwise.

16. The apparatus of claim 15, wherein:

the first resource allocation is determined based on a lowest supportable rate for a multicast channel receivable by each remote station in the multicast group; and

the second resource allocation is determined based on supportable rates for unicast channels receivable by each of the two or more channels.

17. The apparatus of claim 16, further comprising means for receiving supportable rates as physical layer feedback.

18. The apparatus of claim 15, further comprising:

means for determining, based on the comparison, whether unicast transmission is more efficient than multicast transmission.

19. The apparatus of claim 15, further comprising:

means for receiving link parameters for each remote station in the multicast group; and

means for receiving link parameters for a multicast channel suitable for transmission to all remote stations in the multicast group.

20. The apparatus of claim 19, wherein the means for comparing comprises means for comparing system resource requirements for multicast transmission of the packet to the multicast group on the multicast channel with system resource requirements for a sum of individual unicast transmissions of the packet to each of the remote stations in the multicast group.

21. The apparatus of claim 15, wherein the means for transmitting the packet on two or more channels otherwise comprises:

means for transmitting at least one multicast packet to a subset of the multicast group.

22. An apparatus for handling communications data flows, the apparatus comprising:

at least one antenna; and

at least one processor configured to;

receive, via the at least one antenna, a packet addressed to a multicast group comprising two or more remote stations;

compare a first resource allocation required for multicast transmission to the multicast group on a single channel with a second resource allocation required for unicast transmission to the multicast group on two or more channels; and

transmit the packet, via the at least one antenna, on one channel when the first resource allocation is less than the second resource allocation, and transmit the packet via the at least one antenna on two or more channels otherwise.

23. The apparatus of claim 22, wherein:

the first resource allocation is determined based on a lowest supportable rate for a multicast channel receivable by each remote station in the multicast group; and

the second resource allocation is determined based on supportable rates for unicast channels receivable by each of the two or more channels.

24. The apparatus of claim 23, wherein the at least one processor is further configured to receive, via the at least one antenna, supportable rates as physical layer feedback.

25. The apparatus of claim 22, wherein the at least one processor is further configured to determine, based on the comparison, whether unicast transmission is more efficient than multicast transmission.

26. The apparatus of claim 22, wherein the at least one processor is further configured to:

receive, via the at least one antenna, link parameters for each remote station in the multicast group and link parameters for a multicast channel suitable for transmission to all remote stations in the multicast group.

27. The apparatus of claim 26, wherein the at least one processor is configured to compare system resource requirements for multicast transmission of the packet to the multicast group on the multicast channel with system resource requirements for a sum of individual unicast transmissions of the packet to each of the remote stations in the multicast group.

28. The apparatus of claim 22, wherein the at least one processor is configured to transmit the packet on two or more channels otherwise by:

transmitting at least one multicast packet to a subset of the multicast group.