Time division duplexed digital distributed antenna system

• US 8,165,100 B2
• Filed: 12/19/2008
• Issued: 04/24/2012
• Est. Priority Date: 12/21/2007
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Powerwave Technologies Incorporated
• Inventors: Sabat, John, Porte, David
• Primary Examiner(s): Yao, Kwang B
• Assistant Examiner(s): Bokhari, Syed M
• Application Number:
  US12/340,401
• Publication Number:
  US 20090180407A1
• Time in Patent Office: 1,222 Days
• Field of Search: 370/347, 370/95.3, 370/337, 370/350, 370/280, 455/562.1, 455/67.11, 398/115, 398/96, 375/219
• US Class Current: 370/337
• CPC Class Codes: H04B 10/25754 Star network topology
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

A Time Division Duplexed (TDD) digital distributed antenna system (DDAS) that performs simulcast distribution to multiple simulcast groups while using TDD time advanced burst to negate the data rate reducing effects of transport delays. The User Plane data is adapted for eliminating time delay ambiguities across multiple simulcast digital radios. In addition, the Control and Management Plane is aggregated across multiple remote units to allow a non-modified donor digital base station to control simulcast groups.

Claims

1. a digital distributed antenna system (DDAS), comprising:

a base station providing transmit and receive time division duplexed (TDD) digital communication signals;

a plurality of remote radio units, each radio unit having an associated programmable delay buffer; and

a plurality of TDD fiber optic interface links coupled between the base station and the one or more remote radio units;

wherein the base station provides a time advanced burst for downlink TDD communications with the one or more remote radio units to compensate for fiber transport delay and propagation delay, whereby said programmable delay buffers equalize time delay from said remote radio units to the base station; and

wherein the time advanced burst provides a partial overlap at the base station of the downlink burst and the uplink burst from a remote user that has been repeated by the remote radio unit.

2. The DDAS system of claim 1, wherein the time advanced burst is transmitted by the remote radio after the remote radio has finished receiving the uplink burst of a previous burst from a remote user.

3. The DDAS system of claim 1, further comprising means for triggering the base station to provide said time advanced burst.

4. A digital distribution communication network, comprising:

a base station providing a transmit and receive time division duplexed (TDD) digital communication signal;

a plurality of TDD digital distributed radio (DDR) remotes coupled via separate TDD interface links to receive the TDD digital signal from the base station; and

a TDD DDR hub configured to provide a 1;

N downlink simulcast of the TDD digital communication signal, the TDD DDR hub coupled to the base station and each of the plurality of TDD DDR remotes, wherein the base station provides a time advanced burst for downlink TDD communication with the plurality of DDR remotes to compensate for fiber transport delay and propagation delay of the longest delay of the N remotes in the uplink TDD communication, whereby the DDR hub incorporates a programmable delay buffer to reflect the common delay value for the digital multiplexed signals from all of the DDR remote units.

5. The digital distribution communication network of claim 4, wherein the TDD hub comprises:

a multiplexer coupled to the TDD base station;

a plurality of fiber optic digital interface links coupled to a plurality of multiplexers and to each of the corresponding plurality of DDR remotes; and

a user plane processor for implementing summation and splitting operations, and

providing a programmable time delay for providing a common propagation delay value to the TDD communication signals to and from the plurality of TDD DDR remotes.

6. The digital distribution communication network of claim 4, further comprising:

a Control and Management (C&

M) processor for processing the C&

M data plane from both the base station and the plurality of TDD DDR remotes and managing the simulcast distribution of the data plane to the plurality of DDR remotes.

7. The digital distribution communication network of claim 4, wherein the TDD DDR hub manages a remote digital interface delay to align a plurality of remote digital multiplexed TDD communication signals from the plurality of TDD DDR remotes.

8. The digital distribution communication network of claim 4, wherein each of the plurality of TDD DDR remotes comprise a programmable delay for equalizing all of the plurality of DDR propagation times to the TDD DDR Hub.

9. The digital distribution communication network of claim 4, wherein the TDD communication signal is a Common Public Radio Interface (CPRI) or Open Base Station Architecture Initiative (OBSAI) signal.

10. The digital distribution communication network of claim 4, wherein the time advanced burst provides a partial overlap of a base station downlink burst and a TDD DDR remote unit receipt of an uplink burst from a remote user.

11. The digital distribution communication network of claim 4, wherein the time advanced burst is transmitted by the remote after the TDD DDR remote has finished receiving the uplink burst of a previous burst from a remote user.

12. a method for providing a time division duplexed (TDD) digital communication signal between a digital base station and a plurality of remote digital distributed radios (DDRs), the method comprising:

providing and receiving a multiplexed TDD communication signal at a digital base station via a digital distributed interface unit;

processing the digital multiplexed TDD communication signal for controlled distribution of a 1;

N simulcast distribution of the digital multiplexed TDD communication signal to and from a plurality of remote DDRs via separate TDD interface links; and

providing a time advanced burst for downlink TDD communications with the plurality of remote radio units to compensate for fiber transport delay and propagation delay, wherein the digital distributed interface unit manages a remote digital interface delay to align a plurality of remote digital multiplexed TDD signals from the plurality of remote DDRs; and

whereby the digital distributed interface unit co-operates with the plurality of DDR remote units to reflect the common delay value for the digital multiplexed signals from all remote DDR'"'"'s.

13. The method of claim 12, wherein the time advanced burst provides a partial overlap of a base station downlink burst and the remote radio unit receipt of an uplink burst.

14. The method of claim 12, wherein the time advanced burst is transmitted by the remote DDR after the remote DDR has finished receiving the uplink burst of a previous burst from a remote user.

15. The method of claim 12, further comprising triggering the base station to provide said time advanced burst.

16. The method of claim 12, further comprising:

processing a C&

M data plane from both the digital base station and the plurality of remote DDRs; and

managing the simulcast distribution of the data plane to the plurality of remote DDRs.

17. The method of claim 12, wherein each of the plurality of remote DDRs provides a programmable delay to equalize propagation time to the digital distributed interface unit.

18. The method of claim 12, wherein the multiplexed TDD signal is a Common Public Radio Interface (CPRI) or Open Base Station Architecture Initiative (OBSAI) signal.

19. The method of claim 12, wherein the plurality of remote DDRs provide airlink transmission to and from remote users.

20. The method of claim 12, wherein the digital distributed interface unit provides a programmable delay to equalize propagation time to the digital distributed interface unit from the plurality of DDR remote units.