System and method for multiple contention access periods

• US 8,917,675 B2
• Filed: 08/11/2008
• Issued: 12/23/2014
• Est. Priority Date: 08/20/2007
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Qin, Xiangping, Singh, Harkirat, Shao, Huai-Rong, Ngo, Chiu
• Primary Examiner(s): MURPHY, RHONDA L
• Application Number:
  US12/189,534
• Publication Number:
  US 20090052389A1
• Time in Patent Office: 2,325 Days
• Field of Search: None
• US Class Current: 370/329
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02

Abstract

A system and method for multiple contention access periods is disclosed. In one embodiment, the system for wireless communication comprises a coordinator configured to schedule wireless transmissions among a plurality of wireless devices during a plurality of superframes, at least one of the superframes comprising a period during which the coordinator is configured to receive one or more data packets from the wireless devices via at least one random access scheme, the period being partitioned into a plurality of sub-periods which do not overlap with one another, wherein the coordinator is configured to receive at least a first data packet having a first value for a parameter during a first sub-period and a second data packet having a second value for the parameter during a second sub-period, and wherein the first and second values for the parameter are different from each other.

Claims

1. A system for wireless communication, the system comprising:

a coordinator that schedules wireless transmissions among a plurality of wireless devices during a plurality of superframes, at least one of the superframes comprising a period during which the coordinator receives one or more data packets from the wireless devices via at least one random access scheme, the period being partitioned into a plurality of sub-periods which do not overlap with one another and are assigned to wireless transmissions in different directions from one another,

wherein the coordinator receives at least a first data packet having a first value for a parameter during a first sub-period and a second data packet having a second value for the parameter during a second sub-period,

wherein the first and second values for the parameter are different from each other, and

wherein the plurality of sub-periods are dynamically partitioned based on different parameters that are selected by the coordinator, and each sub-period is associated with a different transmission direction for one or more transmissions from selected transmitting positions.

2. The system of claim 1, wherein the period is a contention access period (CAP), and wherein the plurality of sub-periods comprises first and second sub-contention access periods.

3. The system of claim 2, wherein the parameter is indicative of a direction in which the coordinator receives the data packets.

4. The system of claim 3, wherein the coordinator includes a sector antenna or antenna array.

5. The system of claim 2, wherein the parameter is indicative of a modulation and coding scheme (MCS).

6. The system of claim 2, wherein the first and second values of the parameter are respectively indicative of a first and second physical layer transmission scheme, wherein the first physical layer transmission scheme is different from the second physical layer transmission scheme.

7. The system of claim 6, wherein the first physical layer transmission scheme comprises an orthogonal frequency division multiplexing (OFDM) mode, and wherein the second physical layer transmission scheme comprises a single-carrier mode.

8. The system of claim 2, wherein the parameter is indicative of a random access scheme.

9. The system of claim 8, wherein the random access scheme comprises one or more of the following:

slotted Aloha, carrier sense multiple access with collision avoidance (CSMA/CA), and preamble sense multiple access (PSMA).

10. The system of claim 2, wherein the contention access period is partitioned into a plurality of sub-contention access periods using a first partitioning, and wherein the superframe further comprises a beacon period during which the coordinator transmits one or more beacon frames to the wireless devices, and wherein the one or more beacon frames comprise information indicative of the first partitioning.

11. The system of claim 10, wherein the coordinator determines the probability of collision during at least one of the sub-periods of the first partitioning based on a first parameter set.

12. The system of claim 11, wherein the coordinator transmits information indicative of a second partitioning based on a second parameter set so that the probability of collision is reduced.

13. The method of claim 12, wherein the first parameter set and the second parameter set are different from one another.

14. The system of claim 2, wherein each of the plurality of sub-contention access periods are partitioned according to different parameters for reducing probability of collision.

15. The system of claim 14, wherein the parameters comprising one or more of different modulation and coding schemes, different random access schemes or different physical layer transmission schemes.

16. The system of claim 15, wherein the coordinator partitions the sub-contention access periods such that each sub-contention access period corresponds to a different sector of an antenna of the coordinator.

17. The system of claim 2, wherein each sub-contention access period corresponds to a different sector of an antenna.

18. The method of claim 2, wherein a first CAP partitioning is determined based on original parameter set, and a second CAP partitioning is determined based on a new parameter set.

19. The method of claim 18, wherein each parameter set including one or more parameters comprising coordinator transmission direction, modulation and coding scheme, and random access mode.

20. The method of claim 19, wherein the new parameter set includes one or more parameters of an original parameter set.

21. The method of claim 19, wherein the new parameter set includes different parameters from an original parameter set.

22. The system of claim 1, wherein each of the plurality of sub-periods correspond to a different transmission direction of the coordinator.

23. The system of claim 1, wherein each of the plurality of sub-periods correspond to different modulation and coding schemes.

24. The system of claim 1, wherein the plurality of sub-periods are partitioned into sets of sub-periods, each set of sub-periods corresponding to a different parameter, wherein each sub-period in a particular set of sub-periods is associated with a different wireless transmission direction.

25. The system of claim 1, wherein the plurality of sub-periods are partitioned based on associated device identifications.

26. The method of claim 1, wherein the parameters are dynamically selected by the coordinator for reducing probability of collision of data packets.

27. The method of claim 1, wherein the selected transmitting positions comprise transmitting position within a selected range of angle.

28. An electronic device for wireless communication, the device comprising:

a transmitter wirelessly transmits a data packet to a coordinator during a contention access period of at least one of a plurality of superframes, the contention access period comprising a plurality of non-overlapping sub-contention access periods, wherein the sub-contention access periods are each assigned to wireless transmissions in different directions from one another for one or more transmissions from selected transmitting positions, wherein the plurality of sub-contention access periods are dynamically partitioned based on different parameters, and each sub-contention access period corresponds to a different sector of an antenna; and

a receiver receives information on the plurality of sub-contention access periods,

wherein the transmitter sends the data packet during one or more of the plurality of sub-contention access periods based at least partly on the received information.

29. The device of claim 28, wherein the receiver includes a memory to store and access the received information.

30. The device of claim 28, wherein the receiver receives a beacon from the coordinator, and wherein the received beacon comprises the received information.

31. A method of wireless communication in a wireless network, the method comprising:

receiving a first data packet having a first value for a parameter during a first sub-contention access period of a superframe, wherein the superframe comprises a contention access period, wherein the contention access period comprises the first sub-contention access period and at least a second sub-contention access period, the first and second sub-contention access periods being non-overlapping with each other and are assigned to wireless transmissions in different directions from one another; and

receiving a second data packet having a second value for the parameter during the second sub-contention access period,

wherein the first and second values for the parameter are different,

wherein the first and second of sub-contention access periods are dynamically partitioned based on different parameters, and each sub-contention access period is associated with a different transmission direction for one or more transmissions from selected transmitting positions.

32. The method of claim 31, further comprising transmitting information on the first and second sub-contention access periods.

33. The method of claim 31, wherein the parameter is indicative of a direction in which the data packets are received, wherein the first data packet is received from a first direction, and wherein the second data packet is received from a second direction different from the first direction.

34. The method of claim 33, further comprising:

prior to receiving the first data packet, a directional antenna receives information from the first direction; and

after receiving the first data packet, but prior to receiving the second data packet, the directional antenna receives information from the second direction.

35. The method of claim 31, wherein the parameter is indicative of a modulation and coding scheme, wherein the first data packet is received encoded with a first modulation and coding scheme, and wherein the second data packet is received encoded with a second modulation and coding scheme.

36. The method of claim 35, further comprising:

decoding the first data packet according to the first modulation and coding scheme, and decoding the second data packet according to the second modulation and coding scheme.

37. A method for wirelessly communicating data, the method comprising:

transmitting a data packet to a coordinator during a contention access period of at least one of a plurality of superframes, the contention access period comprising a plurality of non-overlapping sub-contention access periods, the sub-contention access periods are each assigned to wireless transmissions in different directions from one another for one or more transmissions from selected transmitting positions; and

receiving information on the plurality of sub-contention access periods,

wherein the data packet is transmitted during one or more of the plurality of sub-contention access periods based at least partly on the information on the plurality of sub-contention access periods,

wherein the plurality of sub-contention access periods are dynamically partitioned based on different parameters, and each sub-contention access period corresponds to a different sector of an antenna.

38. The method of claim 37, wherein receiving information on the plurality of sub-contention access periods comprises accessing a memory.

39. The method of claim 37, wherein receiving information on the plurality of sub-contention access periods comprises receiving a beacon from the coordinator.