MULTIPLE DATA SERVICES OVER A DISTRIBUTED ANTENNA SYSTEM

• US 20120281622A1
• Filed: 04/05/2012
• Published: 11/08/2012
• Est. Priority Date: 12/17/2007
• Status: Active Grant

• Current Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Original Assignee: Corning Optical Communications Wireless Ltd. (Corning Incorporated)
• Inventors: Saban, Ofer, Shapira, Isaac
• Granted Patent: US 9,246,557 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 28/0226 based on location or mobility handoff or reselection H04W36/00; mobile application services making use of the location of users or terminals H04W4/02
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

A system for supporting multiple time division duplexed (TDD) based wireless services or frequency division duplexed (FDD) wireless services on a Distributed Antenna System (DAS). TDD based services use a common clock signal to synchronize the components of the DAS for transmission and reception of TDD signals. The DAS includes a GPS receiver which extracts a timing signal from a GPS signal and distribute the timing signal to components of the DAS to enable synchronization of the components for transmitting and receiving TDD signals. The GPS receiver can be part of the interface that connects a TDD based service to the DAS. The DAS distributes a reference clock signal to the DAS components to maintain zero frequency shift while manipulating with the carrier frequencies of the various wireless services carried by the DAS.

Claims

1. A distributed antenna system, comprising:

at least one wireless source coupled to at least one wiring unit, the at least one wireless source providing signals corresponding to a first wireless service over the distributed antenna system;

a plurality of cable runs each including electrical radio frequency conducting media and connecting the at least one wiring unit to a plurality of antenna units, the cable runs connecting the at least one wiring unit to at least one of the antenna units and transferring signals corresponding to at least one wireless service between the at least one wiring unit and at least one of the antenna units;

an interface adapted to connect a second wireless source providing a second wireless service to the distributed antenna system and transfer signals corresponding to the second wireless service over the distributed antenna system; and

a reference clock connected to the distributed antenna system and adapted to produce and send a reference timing signal over the distributed antenna system.

2. The distributed antenna system of claim 1, further comprising the second wireless source connected to the interface.

3. The distributed antenna system of claim 2, further comprising an envelope detector connected to the distributed antenna system and adapted to receive a signal corresponding to a wireless service and produce a timing signal, the timing signal being transferred over the distributed antenna system.

4. The distributed antenna system of claim 3, wherein the envelope detector is connected to the second wireless source and adapted to transfer the timing signal to the interface.

5. The distributed antenna system of claim 4, wherein the envelope detector transfers a 1 pulse per second timing signal to the interface.

6. The distributed antenna system of claim 5, wherein the timing signal is transferred over the distributed antenna system to at least one of the antenna units and used by the antenna unit to synchronize an operation of the antenna unit.

7. The distributed antenna system of claim 2, wherein first wireless service comprises voice services.

8. The distributed antenna system of claim 3, wherein the timing signal is modulated onto a carrier signal and transferred over the distributed antenna system using the carrier signal.

9. The distributed antenna system of claim 3, wherein the timing signal is transferred over the distributed antenna system to at least one antenna unit and used by the antenna unit to synchronize an operation of the antenna unit.

10. The distributed antenna system of claim 2, further comprising a micro cell providing a second wireless source and wherein the micro cell includes the GPS receiver.

11. A distributed antenna system, comprising:

a first combining unit;

a plurality of cable runs each including electrical radio frequency conducting media and connecting the first combining unit to a plurality of antenna units;

the first combining unit including a base station connection capable of connecting a base station to the first combining unit, the first combining unit being capable of transferring signals corresponding to a first wireless service between the base station and at least one of the cable runs;

at least one wireless service access point connected to the first combining unit, the first combining unit being capable of transferring signals corresponding to a second wireless service between the at least one wireless access point and at least one of the cable runs;

a first interface module connected to the wireless service access point and capable of converting a control signal sent from the wireless service access point to an intermediate frequency (IF) control signal and transferring the IF control signal between the wireless service access point and the first combining unit; and

a second combining unit connected to at least one of the cable runs and capable of receiving the IF control signal and converting the IF control signal back to the control signal and transferring the control signal to at least one of the antenna units of the distributed antenna system.

12. The distributed antenna system of claim 11, further comprising a reference clock signal generator connected to the first combining unit and capable of generating a reference clock signal, the first combining unit being capable of receiving the reference clock signal and transmitting the reference clock signal over at least one of the cable runs to at least one of the antenna units.

13. The distributed antenna system of claim 12, wherein the first combining unit is capable of transferring the IF control signal between the first interface module and at least one of the cable runs.

14. The distributed antenna system of claim 13, wherein the first combining unit uses the reference clock signal to convert a signal received from the access point corresponding to the second wireless service to an intermediate frequency signal and transfers the intermediate frequency signal over at least one of the cable runs to at least one of the antenna units.

15. A distributed antenna system comprising:

at least one wiring unit;

a first wireless source connected to the at least one wiring unit, the first wireless source providing signals corresponding to a first wireless service over the distributed antenna system;

a plurality of antenna units;

a plurality of cable runs each including electrical radio frequency conducting media connecting the at least one wiring unit to the plurality of antenna units and transferring signals corresponding to at least one wireless service between the at least one wiring unit and the antenna units;

a second wireless source;

an interface adapted to connect the second wireless source to provide a second wireless service to the distributed antenna system and transfer signals corresponding to the second wireless service over the distributed antenna system;

a GPS receiver adapted to receive a GPS signal and produce a timing signal, the timing signal being transferred over the distributed antenna system, wherein the GPS receiver is connected to the second wireless source and adapted to transfer the timing signal to the interface; and

a reference clock connected to the distributed antenna system and adapted to produce and send a reference timing signal over the distributed antenna system.