Methods for reducing contention and/or handling channel access in a network

• US 8,050,249 B1
• Filed: 09/10/2010
• Issued: 11/01/2011
• Est. Priority Date: 04/26/2004
• Status: Expired due to Fees

• Current Assignee: NXP USA, Inc. (NXP Semiconductors NV)
• Original Assignee: Marvell International Limited (Marvell Technology Group Limited)
• Inventors: Salhotra, Atul, Kopikare, Rahul, Narasimhan, Ravi
• Primary Examiner(s): Patel; Ajit
• Assistant Examiner(s): NGUYEN, KHAI MINH
• Application Number:
  US12/879,943
• Time in Patent Office: 417 Days
• Field of Search: 370/349, 370/445, 370/448, 370/447, 370/465
• US Class Current: 370/349
• CPC Class Codes: H04L 1/188 Time-out mechanisms
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements

Abstract

A first information block is transmitted from a first terminal, the first terminal retaining access to a channel until either i) the first information block is acknowledged by a second terminal, or ii) at least a first predetermined period of time following transmission of the first information block expires, whichever is shorter. It is determined whether the first information block is acknowledged within the first predetermined period of time. A second information block is transmitted from the first terminal in response to the first information block being acknowledged within the first predetermined period of time. When the first information block has a first type, the first information block is retransmitted in response to the first information block not being acknowledged within the first predetermined period of time. When the first information block has a second type, retransmitting the first information block is attempted after waiting a second predetermined period of time.

Claims

1. A method of transmitting information over a network, the information comprising a plurality of information blocks, the method comprising:

transmitting a first information block from a first terminal over a channel in the network, the first terminal retaining access to the channel until either

the first information block is acknowledged by a second terminal receiving the first information block, or

at least a first predetermined period of time following transmission of the first information block expires, whichever is shorter;

determining whether the first information block is acknowledged within the first predetermined period of time;

transmitting a second information block from the first terminal over the network in response to the first information block being acknowledged within the first predetermined period of time; and

in response to the first information block not being acknowledged within the first predetermined period of time,

retransmitting the first information block when the first information block has a first type, and

waiting for a second predetermined period of time before attempting to retransmit the first information block when the first information block has a second type.

2. The method of claim 1, wherein each of the plurality of information blocks comprises a data packet.

3. The method of claim 1, wherein the network comprises a wireless network.

4. The method of claim 3, wherein the network is compatible with IEEE Standard 802.11e.

5. The method of claim 4, wherein each of the first information block and the second information block has an access category.

6. The method of claim 5, wherein the access category corresponds to a voice access category and/or video access category.

7. The method of claim 1, wherein the method and/or network comply or are compatible with one or more of IEEE Standards 802.11a, 802.11b, 802.11e, 802.11g and/or 802.11n.

8. The method of claim 1, further comprising selecting (i) a first value for the first predetermined period of time when the channel is in use, and (ii) a second value for the first predetermined period of time when the channel is not in use, the first predetermined period being different from the second predetermined period of time.

9. The method of claim 8, wherein the first value for the first predetermined period of time comprises a minimum interference spacing.

10. The method of claim 9, wherein the first value for the first predetermined period of time has a maximum length of an arbitration interference spacing.

11. The method of claim 8, wherein the second value for the first predetermined period of time comprises a minimum interference spacing and an acknowledgement length.

12. The method of claim 1, further comprising calculating a length of time remaining in a transmission period.

13. The method of claim 12, wherein the retransmitting step comprises retransmitting the first information block when the calculated remaining length of time is greater than an information block transmission time, and wherein the method further comprises waiting until the remaining length of time expires before attempting to access the channel when the information block transmission time is greater than the remaining length of time.

14. The method of claim 1, wherein the first type corresponds to a high priority, a downstream direction, a low latency characteristic, or a relatively high transmission rate.

15. The method of claim 14, wherein the second type corresponds to a low priority, an upstream direction, a latency characteristic other than low latency, or a relatively low transmission rate.

16. The method of claim 1, wherein the first terminal releases or relinquishes control of or access to a channel in the network before attempting to retransmit the first information block.

17. The method of claim 1, further comprising counting a number of times the retransmitting step is performed.

18. The method of claim 17, further comprising waiting for a second predetermined period of time before attempting again to retransmit the first information block after the retransmitting step is performed a first predetermined number of times.

19. The method of claim 17, further comprising retransmitting the first information block at a lower rate after the retransmitting step is performed a second predetermined number of times.

20. The method of claim 1, further comprising:

transmitting a third information block from a first station over the network; and

following transmission of the third information block,

transmitting a fourth information block from the first station over the network in response to the third information block being acknowledged within a third predetermined period of time; and

waiting for a fourth predetermined period of time before attempting to retransmit the third information block from the first station in response to the third information block not being acknowledged within the third predetermined period of time.