Method and apparatus for synchronizing and/or starting access points for adaptive time division multiplexing on a multi-channel wireline medium with colocated transceivers

• US 8,335,180 B1
• Filed: 10/09/2008
• Issued: 12/18/2012
• Est. Priority Date: 05/09/2008
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Kamath, Purushotham, Cho, James S., Kumar, Prem, Smith, Matthew, Liang, Haixiang
• Primary Examiner(s): Ferris, Derrick
• Assistant Examiner(s): Acolatse, Kodzovi
• Application Number:
  US12/248,852
• Time in Patent Office: 1,531 Days
• Field of Search: 370/324
• US Class Current: 370/324
• CPC Class Codes: H04B 7/2643 using time-division multiple access [TDMA] H04B7/2615, H04B7/2618 take precedence

Abstract

Starting up and synchronizing multiple access points in a wireline communications circuit using transceivers compatible with a wireless communications protocol with an adaptive Time Division Multiple Access scheme for a multi-channel medium with colocated transceivers. Synchronization readiness is asserted and the access points wait for a synchronization start signal'"'"'s assertion. Methods of operating an access point, its implementation as a chip are further disclosed. An access point assembly including the access points and a synchronization circuit are also disclosed.

Claims

1. An access point assembly, comprising:

at least two access points, wherein each of the at least two access points comprise a transmitter and a receiver that are compliant to a wireless protocol for use with a wireline medium; and

a synchronizing circuit coupled with each of said the at least two access points to receive a synchronization ready signal and to generate a synchronization start signal sent to each of said the at least two access points wherein;

said synchronizing circuit configured to respond to an assertion of each of said synchronization ready signals by asserting said synchronization start signal;

the at least two access points configured to execute an adaptive Time Division Multiple Access (TDMA) protocol using said transmitter and said receiver in response to said assertion of said synchronization start signal, wherein execution of said adaptive TDMA protocol comprises directing said transmitter to send a beacon and a schedule on said wireline medium to initiate a time division multiple access sequence of uplink frames and downlink frames, signaling other access points and moving ahead said schedule in response to a first determination that one of said uplink frames needs no upload and signaling other access points and moving ahead said schedule in response to a second determination that one of said downlink frames needs no download.

2. The access point assembly of claim 1, wherein said synchronizing circuit is configured to respond to said assertion of each of said synchronization ready signals for a time period by asserting said synchronization start signal.

3. The access point assembly of claim 1, wherein said assertion of said synchronization ready signal is a high impedance state as opposed to a ground state;

and said synchronization circuit includes a pullup resistor tied to each of said synchronization ready signals and to said synchronization start signal.

4. The access point assembly as in claim 1, wherein a distance between each of the at least two access points is less than five meters.

5. The method as in claim 1, wherein the synchronization ready signal is sent from each of the at least two access points.

6. A method comprising the step of operating a synchronizing circuit communicating with at least two access points including a transmitter and a receiver both that are compliant to a wireless protocol for use with a wireline medium, the method comprising:

receiving a synchronization ready signal from each of said the at least two access points;

asserting a synchronization start signal sent to each of said the at least two access points in response to said synchronizations ready signals being asserted, and

triggering each of the at least two access points to execute an adaptive Time Division Multiple Access (TDMA) protocol using said transmitter and said receiver in response to said assertion of said synchronization start signal, wherein each of the at least two access points are collocated and wherein execution of said adaptive TDMA protocol comprises directing said transmitter to send a beacon and a schedule on said wireline medium to initiate a time division multiple access sequence of uplink frames and downlink frames, signaling other access points and moving ahead said schedule in response to a first determination that one of said uplink frames needs no upload and signaling other access points and moving ahead said schedule in response to a second determination that one of said downlink frames needs no download.

7. The method of claim 6, wherein said wireless protocol is a version of an IEEE 802.11 wireless communications protocol.

8. The method of claim 6, wherein said wireline medium is a form of coaxial cable.

9. The method of claim 6, further comprising:

receiving a relinquish message to relinquish use of uplink frame, the relinquish message being sent by at least one station receiving the beacon and the schedule via said wireline medium.

10. The method of claim 6, wherein said synchronization start signal is asserted after said synchronization ready signals are asserted for a predetermined time period.

11. The method as in claim 6, wherein a distance between each of the at least two access points is less than five meters.

12. A method of operating an access point including a transmitter and a receiver both compliant to a wireless protocol for use with a wireline medium, the method comprising:

asserting a synchronization ready signal;

sensing an assertion of a synchronization start signal by a synchronization circuit in response to receiving the asserted synchronization ready signal; and

executing an adaptive Time Division Multiple Access (TDMA) protocol using the transmitter and receiver in response to said assertion of said synchronization start signal, wherein the executing comprises directing said transmitter to send a beacon and a schedule on said wireline medium to initiate a time division multiple access sequence of uplink frames and downlink frames, signaling other access points and moving ahead said schedule in response to a first determination that one of said uplink frames needs no upload and signaling other access points and moving ahead said schedule in response to a second determination that one of said downlink frames needs no download.

13. The method of claim 12, wherein said wireless protocol is a version of an IEEE 802.11 wireless communications protocol.

14. The method of claim 12, wherein said wireline medium is a form of coaxial cable.

15. The method of claim 12, further comprising the step of:

receiving a relinquish message to relinquish use of uplink frame, the relinquish message being sent by at least one station receiving the beacon and the schedule via said wireline medium.

16. A chip for operating an access point, comprising:

a transmitter and a receiver both compliant to a wireless protocol for use with a wireline medium; and

a processor coupled to said transmitter and to said receiver, wherein said processor configured to;

assert a synchronization ready signal and sense an assertion of a synchronization start signal by a synchronization circuit in response to receiving the asserted synchronization ready signal;

start and restart by asserting said synchronization ready signal; and

direct said transmitter to send a beacon and a schedule on said wireline medium to initiate a time division multiple access sequence of uplink frames and downlink frames in response to said assertion of said synchronization start signal, wherein said processor is further configured to signal other access points and to move ahead said schedule in response to a first determination that one of said uplink frames needs no uploads and wherein said processor is further configured to signal other access points and to move ahead said schedule in response to a second determination that one of said downlink frames needs no download.

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

18. The chip of claim 16, wherein said wireline medium is a form of coaxial cable.

19. The chip of claim 16, wherein said wireline medium is a form of a member of group consisting of a fiber optic cable and a twisted pair cable.