Networked and field addressable distributed antenna system

• US 7,065,384 B2
• Filed: 08/21/2001
• Issued: 06/20/2006
• Est. Priority Date: 08/21/2001
• Status: Expired due to Fees

• Current Assignee: HRL Laboratories LLC (The Boeing Co.)
• Original Assignee: HRL Laboratories LLC (The Boeing Co.)
• Inventors: Izadpanah, Hossein
• Primary Examiner(s): Feild, Joseph
• Assistant Examiner(s): Nguyen, Huy D.
• Application Number:
  US09/934,742
• Publication Number:
  US 20030050099A1
• Time in Patent Office: 1,764 Days
• Field of Search: 455/562.1, 455/557, 455/561, 455/16, 455/24, 455/25, 455/500, 455/507, 455/446, 455/41.2, 455/20, 455/450, 455/449, 455/444
• US Class Current: 455/562.1
• CPC Class Codes: H04B 7/0491 using two or more sectors, i.e. sector diversity
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/1555 Selecting relay station antenna mode, e.g. selecting omnidirectional -, directional beams, selecting polarizations
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 16/32 Hierarchical cell structures

Abstract

The present invention provides a megacell 100, which is divided into a plurality of picocells 102. Each picocell 102 is serviced by a secondary base repeater node configured to transmit to any of three adjacent picocells 102. The base station 106 acts both as an originating information signal source and as an originating base station for transmitting a command signal. The command signal is a narrowband signal, which can be transmitted on a channel with sufficient range to reach the entire megacell. The information signal is a broadband signal with a short range picocell, which is transmitted from a secondary base repeater node to its adjacent neighbors.

Claims

1. A networked and field addressable distributed antenna system comprising a large field megacell coverage area, at least a portion of which is partitioned into a plurality of short range picocells, wherein each of the picocells is serviced by a secondary base repeater node operative to receive an information signal from a neighboring secondary base repeater node or from an originating information signal source, and to receive a command signal including a direction command from an originating base station having a command signal transmitter, and to transmit the information signal in at least one of three directions for receipt by local users or by a neighboring secondary base repeater node positioned along the direction to which the information signal was transmitted, the direction in which the information signal is transmitted being determined by the direction command of the command signal, wherein the secondary base repeater nodes are positioned such that they re-broadcast the information signal to neighboring secondary base repeater nodes in a tree structure.

2. A networked and field addressable distributed antenna system as set forth in claim 1, wherein the secondary base repeater nodes are positioned such that they re-broadcast the information signal in a fan-out tree structure.

3. A networked and field addressable distributed antenna system as set forth in claim 2, wherein the megacell has an input end and an output end, and wherein the information signal may be propagated from secondary base repeater node to secondary base repeater node from an information signal source at the input end to an information signal output end receiver at the output end, with the information signal output end receiver configured to receive from a plurality of base repeater nodes at the output end of the megacell.

4. A networked and field addressable distributed antenna system as set forth in claim 3, wherein at least a portion of the secondary base repeater nodes are further configured to modify the received information signal and to re-transmit the received information signal as a modified information signal.

5. A networked and field addressable distributed antenna system as set forth in claim 3, wherein the information signal output end receiver is connected with the information source by a loop back means.

6. A networked and field addressable distributed antenna system as set forth in claim 5, wherein the loop back means is selected from the group consisting of a fiber-optic cable, a wire, and a point-to-point wireless channel.

7. A networked and field addressable distributed antenna system as set forth in claim 6, wherein at least a portion of the secondary base repeater nodes are further configured to modify the received information signal and to re-transmit the received information signal as a modified information signal.

8. A networked and field addressable distributed antenna system as set forth in claim 7, wherein the information signal contains a call setup portion and wherein at least a portion of the secondary base repeater nodes further configured with a means for receiving a call setup request from a local user including an identity of at least one second local user in the megacell, and wherein the networked and field addressable distributed antenna system further comprises a means for mapping the identity of a local user to a picocell within the megacell and providing information for generating a direction command of a command signal such that the direction command causes a call to be established along a predetermined path through the megacell and the loop back means from the local user to the at least one second local user, whereby a user may transmit information to at least one other desired user within the megacell.

9. A networked and field addressable distributed antenna system as set forth in claim 1, wherein the direction command from the command signal includes a direction command for a plurality of secondary base repeater nodes in order to cause the secondary base repeater nodes to transmit the information signal along a predetermined path through the megacell.

10. A networked and field addressable distributed antenna system as set forth in claim 1, wherein the secondary base repeater nodes further comprise a command signal receiver for receiving a command signal and an information receiving antenna for receiving the information signal from a neighboring secondary base repeater node or from an originating information signal source, an amplifier for receiving the information signal from the information receiving antenna, operative for amplifying the information signal, and an information signal transmitter for receiving the amplified information signal from the amplifier and operative in response to the command signal to transmit the information signal in a direction to at least one of three picocells for receipt by local users or by the next neighboring secondary base repeater node receiving from each picocell to which the information signal was transmitted, the direction in which the information signal is transmitted being determined by the direction command of the command signal.

11. A networked and field addressable distributed antenna system as set forth in claim 10, secondary base repeater nodes are positioned only in a desired area of coverage within the megacell such that only specified picocells representing the desired area of coverage within the megacell may receive coverage by the information signal.

12. A networked and field addressable distributed antenna system as set forth in claim 10, wherein the information signal transmitters of the secondary base repeater nodes are selected from the group consisting of sector antennas and multi-beam forming antenna arrays.

13. A networked and field addressable distributed antenna system as set forth in claim 12, wherein the information signal transmitters of the secondary base repeater nodes are operative to transmit in at least one of three approximately 60 degree sectors, with the combined three sectors aligned to transmit over a 180 degree angular coverage region substantially opposite the information receiving antenna of the respective secondary base repeater node.

14. A networked and field addressable distributed antenna system as set forth in claim 10, wherein each picocell is coincident with a coverage range of the servicing secondary base node, with the coverage range of the associated secondary base node including an edge, and wherein a neighboring secondary base node is positioned within the coverage range of the associated secondary base node and near the edge of the coverage range of the associated secondary base node.

15. A networked and field addressable distributed antenna system as set forth in claim 14, wherein the information signal transmitters of the secondary base repeater nodes are selected from the group consisting of sector antennas and multi-beam forming antenna arrays.

16. A networked and field addressable distributed antenna system as set forth in claim 15, wherein the information signal transmitters of the secondary base repeater nodes are operative to transmit in at least one of three approximately 60 degree sectors, with the combined three sectors aligned to transmit over a 180 degree angular coverage region substantially opposite the information receiving antenna of the respective secondary base repeater node.

17. A networked and field addressable distributed antenna system as set forth in claim 16, secondary base repeater nodes are selectively positioned within the megacell such that specified picocells within the megacell may receive coverage by the information signal.

18. A networked and field addressable distributed antenna system as set forth in claim 16, wherein the secondary base repeater nodes are positioned such that they communicate in a fan-out tree structure.

19. A networked and field addressable distributed antenna system as set forth in claim 18, wherein the megacell has an input end and an output end, and wherein the information signal may be propagated from secondary base repeater node to secondary base repeater node from an information signal source at the input end to an information signal output end receiver at the output end, with the information signal output end receiver configured to receive from a plurality of base repeater nodes at the output end of the megacell.

20. A networked and field addressable distributed antenna system as set forth in claim 19, wherein at least a portion of the secondary base repeater nodes are further configured to modify the received information signal and to re-transmit the received information signal as a modified information signal.

21. A networked and field addressable distributed antenna system as set forth in claim 19, wherein the information signal output end receiver is connected with the information source by a loop back means.

22. A networked and field addressable distributed antenna system as set forth in claim 21, wherein the loop back means is selected from the group consisting of a fiber-optic cable, a wire, and a point-to-point wireless channel.

23. A networked and field addressable distributed antenna system as set forth in claim 22, wherein at least a portion of the secondary base repeater nodes are further configured to modify the received information signal and to re-transmit the received information signal as a modified information signal.

24. A networked and field addressable distributed antenna system as set forth in claim 23, wherein the information signal contains a call setup portion and wherein at least a portion of the secondary base repeater nodes further configured with a means for receiving a call setup request from a local user including an identity of at least one second local user in the megacell, and wherein the networked and field addressable distributed antenna system further comprises a means for mapping the identity of a local user to a picocell within the megacell and providing information for generating a direction command of a command signal such that the direction command causes a call to be established along a predetermined path through the megacell and the loop back means from the local user to the at least one second local user, whereby a user may transmit information at least one other desired user within the megacell.

25. A networked and field addressable distributed antenna system as set forth in claim 24, wherein the information signal uses a broadband, picocell transmission channel and command signal uses a narrowband, megacell distribution channel.

26. A networked and field addressable distributed antenna system as set forth in claim 25, wherein the loop back means is used diagnostically to ensure correct path setup and to check connection integrity within the megacell.

27. A method for distributing information to selective picocells within a megacell by using a networked and field addressable distributed antenna system comprising the steps of:

a. receiving an information signal from an information source at a secondary base repeater node;

b. receiving a command signal including a direction command from a command signal transmitter;

c. determining at least one direction in which to re-transmit the received information signal from the secondary base repeater node;

d. re-transmitting the received information signal in at least one of three directions as determined in the determining step (c) for receipt by local users or by a neighboring secondary base repeater node positioned in the direction to which the information signal was transmitted, whereby the information signal may be re-broadcast through a plurality of secondary base repeater nodes in a tree structure.

28. A method for distributing information to selective picocells within a megacell by using a networked and field addressable distributed antenna system as set forth in claim 27, further comprising the step of configuring the base repeater nodes such that they re-broadcast the information signal in a fan-out tree structure.

29. A method for distributing information to selective picocells within a megacell by using a networked and field addressable distributed antenna system, as set forth in claim 28, further comprising the step of selectively positioning the base repeater nodes such that only desired picocells within the megacell are capable of receiving the information signal.

30. A method for distributing information to selective picocells within a megacell by using a networked and field addressable distributed antenna system as set forth in claim 29, wherein the megacell has an input end and an output end, and wherein the method further comprises the step of looping back the information signal from the output end to the input end.

31. A method for distributing information to selective picocells within a megacell by using a networked and field addressable distributed antenna system as set forth in claim 30, further comprising the step of optionally modifying the received information signal at each secondary base repeater node prior the re-transmitting step (d).

32. A method for distributing information to selective picocells within a megacell by using a networked and field addressable distributed antenna system as set forth in claim 31, further comprising the step of performing a call setup between users in the megacell.

33. A method for distributing information to selective picocells within a megacell by using a networked and field addressable distributed antenna system as set forth in claim 32, further comprising the step of using the looping back of the information signal for diagnostically ensuring correct path setup and for checking the path setup connection integrity within the megacell.

34. A method for distributing information to selective picocells within a megacell by using a networked and field addressable distributed antenna system as set forth in claim 30, further comprising the step of using the looping back of the information signal for diagnostically ensuring correct path setup and for checking the path setup connection integrity within the megacell.