Simultaneous simulcast and single cast hybrid multi-tone communication system

• US 20070121546A1
• Filed: 11/22/2006
• Published: 05/31/2007
• Est. Priority Date: 11/25/2005
• Status: Active Grant

• Current Assignee: Gonet Systems Ltd.
• Original Assignee: GO Networks, Inc. (AT&T, Inc.)
• Inventors: Zuckerman, Gal, Kinamon, Roy, Leave, Oz
• Granted Patent: US 8,130,629 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601

Abstract

Methods and systems for simultaneous transmission of simulcast and single cast information over a hybrid point to multipoint communication systems, including the steps of: selecting an area to be ubiquitously covered by a common channel; assigning a first wireless client to the common channel; assigning a second wireless client to a first private channel; setting a first hybrid converter and a second hybrid converter having an aggregated coverage area that comprises the selected area; connecting the first hybrid converter using an orthogonal multi-carrier transmission having a first frequency and the second hybrid converter using an orthogonal multi-carrier transmission having a second frequency to a centralized synchronizing communication controller via a shared signal wired distribution line; converting, by using the first hybrid converter, the first frequency transmission to a third orthogonal multi-carrier wireless transmission having a third frequency; converting, by using the second hybrid converter, the second frequency transmission to a fourth orthogonal multi-carrier wireless transmission having the third frequency; and creating a downlink ubiquitous coverage in the selected area by transmitting the third and the fourth transmissions, each comprising a common MAP over a first sub-channel, a common payload over a second sub-channel, and a first private payload and a second private payload, correspondingly, over a third sub-channel, wherein the third and fourth transmissions are at least partially coverage-overlapping and are synchronizing and bandwidth allocating a first wireless client and a second wireless client.

Claims

1. A point to multipoint communication system comprising:

a centralized synchronizing communication controller and a shared signal wired distribution line, whereby the centralized synchronizing communication controller communicates with a first and a second wireless clients via the shared signal wired distribution line;

wherein the shared signal wired distribution line transports a first downlink signal having a first frequency and a second downlink signal having a second frequency;

the first downlink signal and the second downlink signal are orthogonal multi-carrier modulation signals comprising a common MAP and a common payload;

the first downlink signal further comprises a first private payload and the second downlink signal further comprises a second private payload;

a first bi-directional hybrid converter linked to the common communication channel, wherein the first bi-directional hybrid converter converts the first downlink signal to a third downlink signal;

a second bi-directional hybrid converter linked to the common communication channel, wherein the second bi-directional hybrid converter converts the second downlink signal to a fourth downlink signal;

wherein the third downlink signal and the fourth downlink signal are wireless orthogonal multi-carrier modulation signals transmitted over a third frequency and the third and fourth downlink signals comprise;

the common MAP over a first sub-channel, the common payload over a second sub-channel, and a third sub-channel comprising the first private payload in the third downlink signal and the second private payload in the fourth downlink signal.

2. The system of claim 1, wherein the wireless clients are standard IEEE 802.16 orthogonal multi carrier modulation clients.

3. The system of claim 1, wherein the first wireless client communicates with the first bi-directional hybrid converter using the third frequency, and the first wireless client uses the common payload or the first private payload according to the MAP.

4. The system of claim 3, wherein the second wireless client communicates with the second bi-directional hybrid converter using the third frequency, and the second wireless client uses the common payload or the second private payload according to the MAP.

5. The system of claim 1, wherein the first wireless client communicates with the first bi-directional hybrid converter using the third frequency, and the second wireless client communicates with the second bi-directional hybrid converter using the third frequency;

and wherein the shared signal wired distribution line transports a first uplink signal received by the first hybrid converter and a second uplink signal received by the second hybrid converter;

the first uplink signal having the first frequency and the second uplink signal having the second frequency;

wherein the centralized synchronizing communication controller superpositions the sub-carriers of the common payloads of the first and the second uplink signals, having the same frequency; and

whereby the centralized synchronizing communication controller achieves wireless clients synchronization and bandwidth allocations by simultaneously managing the first and the second downlink signals and the first and the second uplink signals.

6. The system of claim 1, wherein the first wireless client communicates with the first bi-directional hybrid converter using the third frequency, and the second wireless client communicates with the second bi-directional hybrid converter using the third frequency;

and wherein the shared signal wired distribution line transports a first uplink signal received by the first hybrid converter and a second uplink signal received by the second hybrid converter;

the first uplink signal having the first frequency and the second uplink signal having the second frequency;

wherein the centralized synchronizing communication controller decodes the sub-carrier of the private payload of the first uplink signal and decodes the sub-carrier of the private payload of the second uplink signal, and

whereby the centralized synchronizing communication controller achieves wireless clients synchronization and bandwidth allocations by simultaneously managing the first and the second downlink signals and the first and the second uplink signals.

7. The system of claim 1, wherein the first wireless client communicates with the first and with the second bi-directional hybrid converters using the third frequency;

the hybrid converters superposition the sub-carriers of the common payloads of the received uplink signals over the shared signal wired distribution line that transports the super-positioned uplink signal to the centralized synchronizing communication controller.

8. The system of claim 1, wherein the shared signal wired distribution line is selected from the group of:

twisted pair, coax, fiber optics, and a combination thereof.

9. The system of claim 1, wherein the orthogonal multi-carrier modulation signals are OFDM or OFDMA signals.

10. The system of claim 9, wherein the centralized synchronizing communication controller further comprises a MAC used by an IEEE 802.16 orthogonal multi carrier modulation.

11. The system of claim 1, wherein the first and the second bi-directional hybrid converters have at least partially overlapping coverage areas.

12. A method comprising:

selecting an area to be ubiquitously covered by a common channel;

assigning a first wireless client to the common channel;

assigning a second wireless client to a first private channel;

setting a first hybrid converter and a second hybrid converter having an aggregated coverage area that comprises the selected area;

connecting the first hybrid converter using an orthogonal multi-carrier transmission having a first frequency and the second hybrid converter using an orthogonal multi-carrier transmission having a second frequency to a centralized synchronizing communication controller via a shared signal wired distribution line;

converting, by using the first hybrid converter, the first frequency transmission to a third orthogonal multi-carrier wireless transmission having a third frequency;

converting, by using the second hybrid converter, the second frequency transmission to a fourth orthogonal multi-carrier wireless transmission having the third frequency; and

creating a downlink ubiquitous coverage in the selected area by transmitting the third and the fourth transmissions, each comprising a common MAP over a first sub-channel, a common payload over a second sub-channel, and a first private payload and a second private payload, correspondingly, over a third sub-channel, wherein the third and fourth transmissions are at least partially coverage-overlapping and are synchronizing and bandwidth allocating a first wireless client and a second wireless client.

13. The method of claim 12, further comprising:

receiving, by the first wireless client, the third and the fourth transmissions from the first and the second hybrid converters; and

transmitting an uplink to the air, using the third frequency, and according to the received synchronization and bandwidth allocation, by the first wireless client.

14. The method of claim 13, further comprising modulating the uplink by OFDMA and using an amount of sub-channels that is smaller than the entire composition of the OFDMA channel.

15. The method of claim 13, further comprising modulating the uplink by OFDMA and using one sub-channel.

16. The method of claim 12, further comprising:

creating an uplink ubiquitous coverage by using the first hybrid converter for receiving a multi carrier uplink wireless signal transmitted by the first wireless client; and

converting the signal received from the first wireless client, by the first hybrid converter, to a first uplink signal having the first frequency for communicating with the centralized synchronizing communication controller via the shared signal wired distribution line.

17. The method of claim 16, further comprising:

creating an uplink private channel by using the second hybrid converter for receiving a multi carrier uplink wireless signal transmitted by the second wireless client; and

converting the signal received from the second wireless client, by the second hybrid converter, to a second uplink signal having the second frequency for communicating with the centralized synchronizing communication controller via the shared signal wired distribution line.

18. The method of claim 17, further comprising:

using a third hybrid converter for receiving a multi carrier uplink wireless signal transmitted by a third wireless client; and

converting the signal received from the third wireless client, by the third hybrid converter, to a third upload signal having the first frequency for communicating with the centralized synchronizing communication controller via the shared signal wired distribution line; and

superpositioning the sub-carriers of the common payloads of the first and the third uplink signals.

19. The method of claim 18, wherein the step of superpositioning the sub-carriers is performed by using the centralized synchronizing communication controller.

20. The method of claim 12, wherein the shared signal wired distribution line is selected from the group of:

twisted pair, coax, fiber optics, and a combination thereof.

21. The method of claim 12, wherein the orthogonal multi-carrier transmissions are OFDM or OFDMA transmissions.

22. The method of claim 21, wherein the centralized synchronizing communication controller further comprises a MAC used by an IEEE 802.16 orthogonal multi carrier modulation.

23. The method of claim 12, wherein the wireless clients are standard IEEE 802.16 orthogonal multi carrier modulation mobile clients.

24. A method for communicating with a first and a second wireless clients via a point to multipoint shared signal wired distribution line, comprising:

transmitting to a first hybrid converter a first transmission having a first frequency;

transmitting to a second hybrid converter a second transmission having a second frequency, wherein the first transmission and the second transmission are orthogonal multi-carrier modulation signals comprising a common MAP over a first sub-channel, a common payload over a second sub-channel; and

the first transmission further comprising a first private payload and the second transmission further comprising a second private payload, correspondingly, over a third sub-channel;

converting, by using the first hybrid converter, the first transmission to a third wireless transmission having a third frequency;

converting, by using the second hybrid converter, the second transmission to a fourth wireless transmission having the third frequency; and

wirelessly transmitting the third transmission and the fourth transmission for communicating with the first and the second wireless clients.

25. The method of claim 24, further comprising the step of the first wireless client communicating with the first hybrid converter using the third frequency, wherein the first wireless client uses the common payload;

and the second wireless client communicating with the second hybrid converter using the third frequency, wherein the second wireless client uses the second private payload.

26. The method of claim 24, further comprising the step of the first wireless client communicating with the first hybrid converter using the third frequency, wherein the first wireless client uses the first private payload;

and the second wireless client communicating with the second hybrid converter using the third frequency, wherein the second wireless client uses the second private payload.

27. The method of claim 24, wherein the first and the second wireless clients are standard IEEE 802.16 orthogonal multi carrier modulation clients.

28. The method of claim 24, wherein the first, second and third sub-channels are standard IEEE 802.16 orthogonal multi carrier modulation sub-channels.

29. The method of claim 24, wherein the shared signal wired distribution line is selected from the group of:

twisted pair, coax, fiber optics, and a combination thereof.

30. The method of claim 24, wherein the orthogonal multi-carrier modulation signals are OFDM or OFDMA signals.

31. The method of claim 24, further comprising the steps of:

receiving a first uplink transmission from the first wireless client by using the first hybrid converter;

receiving a second uplink transmission from the second wireless client by using the second hybrid converter;

wherein the first and the second uplink transmissions are transmitted over the third frequency;

converting the first uplink transmission to a third uplink transmission having the first frequency and converting the second uplink transmission to a fourth uplink transmission having the second frequency;

transmitting the third and the fourth uplink transmissions over the shared signal wired distribution line;

superpositioning the sub-carriers of the common payloads of the first and the second uplink transmissions; and

decoding the superpositioned transmission.

32. The method of claim 31, wherein the superpositioning is performed by using a centralized synchronizing communication controller.

33. The method of claim 24, further comprising the steps of:

receiving a first uplink transmission by using the first hybrid converter;

receiving a second uplink transmission by using the second hybrid converter;

wherein the first and the second uplink transmissions are transmitted over the third frequency;

converting the first uplink transmission to a third uplink transmission having a fourth frequency and converting the second uplink transmission to a fourth uplink transmission having the fourth frequency; and

transmitting the third and the fourth uplink transmissions over the shared signal wired distribution line.

34. The method of claim 33, wherein the fourth frequency is the first frequency or the second frequency.

35. The method of claim 33, further comprising:

decoding the superpositioned uplink transmission by using a centralized synchronizing communication controller.

36. The method of claim 24, further comprising the steps of:

receiving a first uplink transmission from the first wireless client by using the first hybrid converter;

receiving a second uplink transmission from the second wireless client by using the second hybrid converter;

wherein the first and the second uplink transmissions are transmitted over the third frequency and each comprises a private payload;

converting the first uplink transmission to a third uplink transmission having the first frequency and converting the second uplink transmission to a fourth uplink transmission having the second frequency;

transmitting the third and the fourth uplink transmission over the shared signal wired distribution line; and

decoding the sub-carrier of the private payload of the third uplink transmission and decoding the sub-carrier of the private payload of the fourth uplink transmission.

37. The method of claim 36, wherein the decoding of the sub-carrier of the private payloads is performed by using a centralized synchronizing communication controller.