High speed media access control and direct link protocol

• US 9,072,101 B2
• Filed: 06/26/2012
• Issued: 06/30/2015
• Est. Priority Date: 10/15/2003
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Walton, Jay Rodney, Nanda, Sanjiv
• Primary Examiner(s): Mian, Omer S
• Application Number:
  US13/533,725
• Publication Number:
  US 20120263137A1
• Time in Patent Office: 1,099 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04L 27/2605 Symbol extensions, e.g. Zero Tail, Unique Word [UW]
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities
• 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 52/383 power control in peer-to-peer links
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 74/06 using polling
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Techniques for MAC processing for efficient use of high throughput systems that may be backward compatible with various types of legacy systems are disclosed. In one aspect, a data frame is formed comprising a common portion for transmission in a format receivable by various stations, such as access points and remote stations. The data frame also comprises a dedicated portion, formatted for transmission to a specified remote station. In another aspect, the common portion is unsteered, and the dedicated portion is steered. In another aspect, an access point schedules an allocation in response to a data indication included in a common portion of a data frame transmitted from one remote station to another. In another aspect, a first station transmits a reference to a second station, which measures the reference and generates feedback therefrom.

Claims

1. An access point (AP), comprising:

a transceiver configured to exchange a scheduling message that is transmitted in order to schedule a beacon interval including a common portion allocated for transmissions on an access channel according to only a contention-based format for first and second classes of stations (STAs) and a contention-free portion allocated for transmissions on the access channel according to only a scheduled-access format for the first class of STAs and according to both a scheduled-access format and the contention-based format for the second class of STAs,

wherein the AP provides access to an external communications network,

wherein the first class of STAs and the second class of STAs are both permitted to contend for access to the access channel during the common portion in accordance with only the contention-based format,

wherein the scheduling message instructs the first class of STAs to operate in accordance with the scheduled-access format during the contention-free portion and to prevent from contending for access to the access channel during the contention-free portion in accordance with the contention-based format,

wherein the second class of STAs is permitted to contend for access the access channel during the contention-free portion in accordance with the contention-based format,

wherein the contention-based format during the contention-free portion uses a carrier sense protocol whereby access to the access channel is permitted after sensing the access channel to be idle for a threshold amount of time in order to avoid a collision.

2. The AP of claim 1, wherein the common portion comprises an unsteered reference.

3. The AP of claim 1, wherein the scheduled-access format comprises steering.

15. The AP of claim 1, wherein one or more peer-to-peer transmissions occur during the common portion of the beacon interval in response to the scheduling message.

16. The AP of claim 1, wherein one or more peer-to-peer transmissions occur over the access channel during the contention-free portion of the beacon interval in response to the scheduling message.

18. The method of claim 1, wherein the common portion and the contention-free portion occupy one or more frames within the beacon interval.

19. The method of claim 18, wherein the one or more frames within the beacon interval correspond to one or more transmission opportunities (TXOPs).

4. An access point (AP), comprising:

circuitry for exchanging a scheduling message that is transmitted in order to schedule a beacon interval including a common portion allocated for transmissions on an access channel according to only a contention-based format for first and second classes of stations (STAs) and a contention-free portion allocated for transmissions on the access channel according to only a scheduled-access format for the first class of STAs and according to both a scheduled-access format and the contention-based format for the second class of STAs,

wherein the AP provides access to an external communications network,

wherein the first class of STAs and the second class of STAs are both permitted to contend for access to the access channel during the common portion in accordance with only the contention-based format,

wherein the scheduling message instructs the first class of STAs to operate in accordance with the scheduled-access format during the contention-free portion and to prevent from contending for access to the access channel during the contention-free portion in accordance with the contention-based format,

wherein the second class of STAs is permitted to contend for access the access channel during the contention-free portion in accordance with the contention-based format,

wherein the contention-based format during the contention-free portion uses a carrier sense protocol whereby access to the access channel is permitted after sensing the access channel to be idle for a threshold amount of time in order to avoid a collision.

5. A wireless communication system, comprising:

a first class of stations (STAs) having one or more first STAs;

a second class of STAs having one or more second STAs;

an access point (AP) for transmitting a scheduling message in order to schedule a beacon interval, the beacon interval comprising;

a common portion allocated for transmissions on an access channel according to only a contention-based format for the first and second classes of STAs; and

a contention-free portion allocated for transmissions on the access channel according to a scheduled-access format for the first class of STAs and according to both a scheduled-access format and the contention-based format for the second class of STAs,

wherein the AP provides access to an external communications network,

wherein the first class of STAs and the second class of STAs are both permitted to contend for access to the access channel during the common portion in accordance with only the contention-based format,

wherein the scheduling message instructs the first class of STAs to operate in accordance with the scheduled-access format during the contention-free portion and to prevent from contending for access to the access channel during the contention-free portion in accordance with the contention-based format,

wherein the second class of STAs is permitted to contend for access the access channel during the contention-free portion in accordance with the contention-based format,

wherein the contention-based format during the contention-free portion uses a carrier sense protocol whereby access to the access channel is permitted after sensing the access channel to be idle for a threshold amount of time in order to avoid a collision.

6. An access point (AP)comprising:

means for exchanging a scheduling message that is transmitted in order to schedule a beacon interval

including a common portion allocated for transmissions on an access channel according to a only contention-based format for first and second classes of stations (STAs) and

a contention-free portion allocated for transmissions on the access channel according to only a scheduled-access format for the first class of STAs and according to both a scheduled-access format and the contention-based format for the second class of STAs,

wherein the AP provides access to an external communications network,

wherein the first class of STAs and the second class of STAs are both permitted to contend for access to the access channel during the common portion in accordance with only the contention-based format,

wherein the scheduling message instructs the first class of STAs to operate in accordance with the scheduled-access format during the contention-free portion and to prevent from contending for access to the access channel during the contention-free portion in accordance with the contention-based format,

wherein the second class of STAs is permitted to contend for access the access channel during the contention-free portion in accordance with the contention-based format,

wherein the contention-based format during the contention-free portion uses a carrier sense protocol whereby access to the access channel is permitted after sensing the access channel to be idle for a threshold amount of time in order to avoid a collision.

7. A method comprising:

exchanging a scheduling message that is transmitted by an access point (AP) in order to schedule a beacon interval including a common portion allocated for transmissions on an access channel according to only a contention-based format for first and second classes of stations (STAs) and a contention free portion allocated for transmissions on the access channel according to only a scheduled-access format for the first class of STAs and according to both a scheduled-access format and the contention-based format for the second class of STAs,

wherein the AP provides access to an external communications network,

wherein the first class of STAs and the second class of STAs are both permitted to contend for access to the access channel during the common portion in accordance with only the contention-based format,

wherein the scheduling message instructs the first class of STAs to operate in accordance with the scheduled-access format during the contention-free portion and to prevent from contending for access to the access channel during the contention-free portion in accordance with the contention-based format,

wherein the second class of STAs is permitted to contend for access the access channel during the contention-free portion in accordance with the contention-based format,

wherein the contention-based format during the contention-free portion uses a carrier sense protocol whereby access to the access channel is permitted after sensing the access channel to be idle for a threshold amount of time in order to avoid a collision.

8. The method of claim 7, wherein the common portion comprises an unsteered reference.

9. The method of claim 7, wherein the scheduled-access format comprises steering.

10. The method of claim 7, wherein the common portion comprises a data indication for future transmission.

11. The method of claim 10, wherein the AP receives the data indication.

12. The method of claim 10, wherein the data indication is an allocation request.

13. The method of claim 10, wherein the AP:

receives the data indication in the common portion;

schedules an allocation in response to the data indication; and

transmits the allocation to a given STA that sent the data indication.

14. The method of claim 13, wherein the allocation is transmitted in a consolidated poll.

17. A non-transitory computer-readable medium containing instructions stored thereon, which, when executed by an access point (AP), cause the AP to perform operations, the instructions comprising:

at least one instruction for causing the AP to exchange a scheduling message that is transmitted in order to schedule a beacon interval including a common portion allocated for transmissions on an access channel according to only a contention-based format for first and second classes of stations (STAs) and a contention-free portion allocated for transmissions on the access channel according to only a scheduled-access format for the first class of STAs and according to both a scheduled-access format and the contention-based format for the second class of STAs,

wherein the AP provides access to an external communications network,

wherein the first class of STAs and the second class of STAs are both permitted to contend for access to the access channel during the common portion in accordance with only the contention-based format,

wherein the scheduling message instructs the first class of STAs to operate in accordance with the scheduled-access format during the contention-free portion and to prevent from contending for access to the access channel during the contention-free portion in accordance with the contention-based format,

wherein the second class of STAs is permitted to contend for access the access channel during the contention-free portion in accordance with the contention-based format,

wherein the contention-based format during the contention-free portion uses a carrier sense protocol whereby access to the access channel is permitted after sensing the access channel to be idle for a threshold amount of time in order to avoid a collision.