Method and apparatus for adaptive time division multiplexing on a multi-channel wireline medium with colocated transceivers

• US 8,199,767 B2
• Filed: 05/09/2008
• Issued: 06/12/2012
• Est. Priority Date: 05/09/2008
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm Atheros Incorporated (Qualcomm, Inc.)
• Inventors: Kamath, Purushotham, Cho, James S., Kumar, Prem, Smith, Matthew
• Primary Examiner(s): Mesfin, Yemane
• Assistant Examiner(s): HUYNH, KHOA B
• Application Number:
  US12/118,635
• Publication Number:
  US 20090279565A1
• Time in Patent Office: 1,495 Days
• Field of Search: None
• US Class Current: 370/442
• CPC Class Codes: H04B 7/2643 using time-division multiple access [TDMA] H04B7/2615, H04B7/2618 take precedence

Abstract

A wireline communications circuit using transceivers compatible with a wireless communications protocol is disclosed using access points and stations in an adaptive Time Division Multiple Access scheme for a multi-channel medium with colocated transceivers. Methods of operating an access point and a station, their implementations as chips and the implementation of a chip for either the access point or station are further disclosed.

Claims

1. A method comprising:

operating a first access point among a plurality of access points, wherein the access points communicate over a wireline medium using a respective plurality of frequency channels, wherein each of the access points communicates over the wireline medium with a respective set of one or more stations using the respective frequency channel and using a wireless protocol, wherein a first of the access points includes a transmitter and a receiver both compliant to the wireless protocol, wherein said operating the first access point includes;

the first access point sending a beacon and a schedule over said wireline medium to the respective set of one or more stations, wherein the schedule specifies an uplink phase followed by a downlink phase;

the first access point receiving uplink information over the wireline medium from at least one of the one or more stations of the respective set during the uplink phase;

the first access point moving ahead a start time of the downlink phase in response to (a) determining that the one or more stations of the respective set are done with sending uplink information to the first access point and (b) receiving signals from one or more other ones of the access points that their respective sets of stations are done with sending uplink information;

the first access point moving ahead a time of transmission of a next beacon in response to (c) determining that there is no more downlink information to be sent from the first access point to the respective set of one or more stations and (d) receiving signals from the one or more other ones of the access points that they are done with sending downlink information to their respective sets of one or more stations.

2. The method of claim 1, wherein the start time of the uplink phase is the same across all the access points, wherein the start time of the downlink phase is the same across all the access points.

3. The method of claim 1, wherein said operating further comprises:

the first access point receiving a relinquish message over the wireline medium from a first of the one or more stations of the respective set, wherein the relinquish message indicates that the first station relinquishes use of a portion of the uplink phase that has been allocated to the first station by the schedule.

4. The method of claim 1, wherein the access points are synchronized so that none of the access points are receiving from the wireline medium while any of the access points is transmitting onto the wireline medium.

5. The method of claim 1, wherein the wireless protocol is a version of an IEEE 802.11 wireless communications protocol.

6. The method of claim 1, wherein the wireline medium comprises coaxial cable.

7. A method for communicating over a wireline medium, wherein the communication involves an access point and a plurality of stations, the method comprising:

operating a first of the stations in order to communicate over the wireless medium using a wireless protocol and a first frequency channel, wherein the first station includes a transmitter and a receiver both compliant to the wireless protocol, wherein said operating includes;

the first station receiving a beacon and a schedule from the access point over the wireless medium, wherein the schedule specifies an uplink phase followed by a downlink phase, wherein the schedule also specifies a sequence of time frames within the uplink phase and an allocation of the time frames to respective ones of the stations;

the first station receiving a first relinquish message from a second of the stations over the wireless medium, wherein the first relinquish message indicates that the second station relinquishes a first of the time frames that has been allocated to it by the schedule;

the first station updating said allocation to move ahead a subset of the stations with respect to the sequence of time frames, wherein the subset of the stations are those two or more stations that were originally allocated time frames after the first time frame, wherein the first station is a member of the subset of stations;

the first station transmitting uplink information over the wireless medium during the first time frame;

the first station transmitting a second relinquish message over the wireless medium in response to determining that it has no additional uplink information to transmit.

8. The method of claim 7, wherein an additional access point and an additional set of two or more stations communicate over the wireline medium using a second frequency channel, wherein the access point and the additional access point are synchronized so that the uplink phase is the same for both, wherein the access point and the additional access point are synchronized so that the downlink phase is the same for both.

9. The method of claim 8, where the access point transmits the beacon and the schedule during a beacon phase, wherein the additional access point also transmits a second beacon and a second schedule during the beacon phase.

10. The method of claim 7, wherein said wireless protocol is a version of an IEEE 802.11 wireless communications protocol.

11. The method of claim 7, wherein said wireline medium comprises coaxial cable.

12. A chip for operating a first access point among a plurality of access points, the chip comprising:

a transmitter and a receiver both compliant to a wireless protocol;

a processor; and

a memory storing program instructions, wherein the program instructions, when executed by the processor, cause the processor to operate the first access point, wherein the access points communicate over a wireline medium using a respective plurality of frequency channels, wherein each of the access points communicates over the wireline medium with a respective set of one or more stations using the respective frequency channel and using the wireless protocol, wherein said operating the first access point includes;

sending a beacon and a schedule over said wireline medium to the respective set of one or more stations, wherein the schedule specifies an uplink phase followed by a downlink phase;

receiving uplink information over the wireline medium from at least one of the one or more stations of the respective set during the uplink phase;

moving ahead a start time of the downlink phase in response to (a) determining that the one or more stations of the respective set are done with sending uplink information to the first access point and (b) receiving signals from one or more other ones of the access points that their respective sets of stations are done with sending uplink information;

moving ahead a time of transmission of a next beacon in response to (c) determining that there is no more downlink information to be sent from the first access point to the respective set of one or more stations and (d) receiving signals from the one or more other ones of the access points that they are done with sending downlink information to their respective sets of one or more stations.

13. The chip of claim 12, wherein the start time of the uplink phase is the same across all the access points, wherein the start time of the downlink phase is the same across all the access points.

14. The chip of claim 12, wherein said operating the first access point further comprises:

receiving a relinquish message over the wireline medium from a first of the one or more stations of the respective set, wherein the relinquish message indicates that the first station relinquishes use of a portion of the uplink phase that has been allocated to the first station by the schedule.

15. The chip of claim 12, wherein the access points are synchronized so that none of the access points receive from the wireline medium while any of the access points transmits onto the wireline medium.

16. The chip of claim 12, wherein the wireless protocol is a version of an IEEE 802.11 wireless communications protocol.

17. The chip of claim 12, wherein the wireline medium comprises coaxial cable or optical fiber.

18. The chip of claim 12, wherein the signals from the one or more other ones of the access points are sent to the first access point via wired connections different from the wireline medium.

19. A chip for operating a first station among a plurality of stations in order to facilitate communication between the first station and an access point, the chip comprising:

a transmitter and a receiver both compliant to a wireless protocol;

a processor; and

a memory storing program instructions, wherein the program instructions, when executed by the processor, cause the processor to operate the first station in order to communicate over the wireless medium using the wireless protocol and a first frequency channel, wherein said operating the first station includes;

receiving a beacon and a schedule from the access point over the wireless medium, wherein the schedule specifies an uplink phase followed by a downlink phase, wherein the schedule also specifies a sequence of time frames within the uplink phase and an allocation of the time frames to respective ones of the stations;

receiving a first relinquish message from a second of the stations over the wireless medium, wherein the first relinquish message indicates that the second station relinquishes a first of the time frames that has been allocated to it by the schedule;

updating said allocation to move ahead a subset of the stations with respect to the sequence of time frames, wherein the subset of the stations are those two or more stations that were originally allocated time frames following the first time frame, wherein the first station is a member of the subset of stations;

transmitting uplink information over the wireless medium during the first time frame;

transmitting a second relinquish message over the wireless medium in response to determining that the first access point has no additional uplink information to transmit.

20. The chip of claim 19, wherein an additional access point and an additional set of two or more stations are configured to communicate over the wireline medium using a second frequency channel, wherein the access point and the additional access point are configured to synchronize so that the uplink phase is the same for both, wherein the access point and the additional access point are configured to synchronize so that the downlink phase is the same for both.

21. The chip of claim 19, where the processor is configured to transmit the beacon and the schedule during a beacon phase, wherein the additional access point is configured to transmit a second beacon and a second schedule during the beacon phase.

22. The chip of claim 19, wherein said wireless protocol is a version of an IEEE 802.11 wireless communications protocol.

23. The chip of claim 19, wherein said wireline medium comprises coaxial cable or optical fiber.

24. The chip of claim 19, wherein the uplink information includes an acknowledgement of a packet of data previously received by the first station from the access point.