Method and system for a remote downlink transmitter for increasing the capacity and downlink capability of a multiple access interference limited spread-spectrum wireless network

• US 7,535,867 B1
• Filed: 04/20/2006
• Issued: 05/19/2009
• Est. Priority Date: 02/02/2001
• Status: Expired due to Fees

• Current Assignee: Leidos, Inc. (Leidos Holdings, Inc.)
• Original Assignee: Science Applications International Corporation
• Inventors: Slocumb, Travis H. III, Kilfoyle, Daniel B., Carson, Steven
• Primary Examiner(s): Backer; Firmin
• Assistant Examiner(s): NG, CHRISTINE Y
• Application Number:
  US11/407,098
• Time in Patent Office: 1,125 Days
• Field of Search: 370/328, 370/329, 370/331, 370/335, 370/338, 370/342, 370/431, 370/466, 370/252
• US Class Current: 370/328
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels

Abstract

The present invention relates to a system and method for extending the coverage area and communication capacity of a spread-spectrum based wireless network. The system comprises a unique dual-scale, asymmetrical cellular architecture for a wireless network, wherein the communication uplink is based on a macro-cellular system, and the communication downlink is based on a micro-cellular system. Through the user of remote downlink transmitters in the micro-cellular system, the present invention provides a cost effective solution for increasing communication capacity, extending coverage area, and providing high-speed communication downlink.

Claims

1. A method for increasing user capacity and high-speed data service of wireless communication network comprising the steps of:

receiving at a base station of the network a request for a high-speed data service from a first user;

providing the requested high-speed data via download from a remote emitter directly to the first user;

determining a first path loss from the first user to the remote emitter;

detecting a second user of the network;

determining a second path loss from the second user to the remote emitter;

if the second path loss is equal to or less than the first path loss, directly providing data download from the remote emitter to the second user; and

if the second path loss is greater than the first path loss, directly providing data download from the base station to the second user.

2. The method of claim 1, wherein the high-speed data service comprises high-speed data download from the network to the first user.

3. The method of claim 1, further comprising:

providing a communication link between the base station and the remote emitter.

4. The method of claim 3, wherein the communication link comprises an out-of-band radio frequency (RF) communication link.

5. The method of claim 3, wherein the communication link comprises a landline connected communication link.

6. The method of claim 3, wherein the communication link comprises an internet protocol (IP) network.

7. The method of claim 3, wherein the communication link comprises an in-band RF link.

8. The method of claim 1, wherein providing the requested high-speed data download from the remote emitter directly to the first user comprises:

providing the requested high-speed data download from a data network to the first user via a direct communication link between the data network and the remote emitter.

9. A method for a providing a wireless communication network with increased user capacity and enhanced high speed data service, comprising:

providing a base station for serving the network;

providing at least one remote emitter associated with the network;

detecting a plurality of user equipments (UEs) active in the network;

commanding the plurality of UEs to monitor the at least one remote emitter;

receiving reports from the detected UEs indicating a path loss between each one of the detected UEs and the base station and at least one remote emitter;

determining whether any of the plurality of UEs is requesting high speed data service; and

if one of the plurality of UEs is requesting high speed data service, designating the one UE as an enhanced UE and establishing a data link between the enhanced UE and the base station or the at least one remote emitter depending on the most favorable path loss to the enhanced ULE.

10. The method of claim 9, wherein establishing the data link between the enhanced UE and the base station or the at least one remote emitter comprises:

identifying one of the at least one remote emitter and the base station as an optimal emitter with the most favorable path loss to the enhanced UE for serving the enhanced UE;

identifying a subset of the plurality of UEs, from the detected UEs, with the same or more favorable path loss to the optimal emitter;

grouping the enhanced UE and the subset of UEs into an enhanced UE set;

initiating a control channel for UEs of the enhanced UE set from the optimal emitter;

commanding the UEs of the enhanced UE set to process the control channel from the optimal emitter and be served by the optimal emitter;

verifying that the optimal emitter is serving the UEs of the enhanced UE set; and

providing downlink data transmission to the UEs of the enhanced UE set directly from the optimal emitter.

11. The method of claim 10, wherein if the base station is not the optimal emitter, commanding the UEs of the enhanced UE set to process the control channel from the optimal emitter and be served by the optimal remote comprises:

providing a control channel to the UEs of the enhanced UE set from the base station while concurrently providing the control channel to the UEs of the enhanced UE set from the optimal emitter.

12. The method of claim 11, wherein power of the control channel from the base station and power of the control channel from the optimal emitter may be independently controlled.

13. The method of claim 11, wherein verifying that the optimal emitter is serving the UEs of the enhanced UE set comprises:

receiving verification that the UEs of the enhanced UE set are receiving control channels from both the base station and the optimal emitter.

14. The method of claim 10, wherein if the base station is not the optimal emitter, providing downlink data transmission to the UEs of the enhanced UE set directly from the optimal emitter comprises:

initiating a data channel to the UEs of the enhanced UE set from the optimal emitter;

suppressing a data channel to the UEs of the enhanced UE set from the base station; and

reviewing the reports received from the detected UEs indicating the path loss between the one of the detected UEs and the each one of the base station or at least one remote emitter.

15. The method of claim 14, further comprising:

removing a UE from the enhanced UE set based on the received reports; and

adding a UE to the enhanced UE set based on the received reports.

16. The method of claim 14, further comprising:

adding a UE to the enhanced UE set based on the received reports.

17. The method of claim 14, further comprising:

removing a UE from the enhanced UE set based on the received reports.

18. The method of claim 17, wherein removing the UE from the enhanced UE set comprises:

deactivating the downlink data transmission from the optimal emitter to the removed UE.

19. The method of claim 18, wherein removing the UE from the enhanced UE set further comprises:

activating the downlink data transmission directly from the base station to the removed UE.

20. The method of claim 9, wherein the received reports from the detected UEs indicating a path loss comprise reports indicating strength of pilot channel signals received by each of the detected UEs from each of the base station and the at least one remote emitter.

21. The method of claim 20, wherein the strength of pilot channel signals from the at least one remote emitter are suppressed with respect to the pilot channel signals from the base station.

22. The method of claim 9, further comprising:

initiating a control channel for the enhanced UE from the optimal emitter; and

providing downlink data transmission to the enhanced UE directly from the optimal emitter.