Time division duplexed digital distributed antenna system
First Claim
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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.
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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.
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Citations
20 Claims
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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. - View Dependent Claims (2, 3)
- a base station providing transmit and receive time division duplexed (TDD) digital communication signals;
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4. A digital distribution communication network, comprising:
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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. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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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. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
- providing and receiving a multiplexed TDD communication signal at a digital base station via a digital distributed interface unit;
Specification