Optical fiber coupling configurations for a main-remote radio base station and a hybrid radio base station
First Claim
1. A main-remote radio base station system, comprising:
- N remote radio units, N being an integer equal to or greater than 2;
a main unit; and
an optical fiber for communicating information between the main unit and the remote units, the optical fiber including a first fiber path for communicating information from the main unit to the remote units and a second fiber path for communicating information from the remote radio units to the main unit, each of the first and second fiber paths including one or more optical links;
wherein the main and remote digital interface units are configured so that information from the main unit is sent over the first fiber path to the remote units so that the same information is transmitted over a radio interface by the remote units at substantially the same time and the main unit receives the same information from each of the remote units over the second fiber path at substantially the same time.
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Accused Products
Abstract
A main-remote radio base station system includes plural remote radio units. Fiber costs are significantly reduced using a single optical fiber that communicates information between the main unit and the remote units connected in a series configuration. Information from the main unit is sent over a first fiber path to the remote units so that the same information is transmitted over the radio interface by the remote units at substantially the same time. The main unit receives the same information from each of the remote units over a second fiber path at substantially the same time. Delay associated with each remote unit is compensated for by advancing a time when information is sent to each remote unit. A data distribution approach over a single fiber avoids the expense of separate fiber couplings between the main unit and each RRU. That approach also avoids the expense of WDM technology including lasers, filters, and OADMs as well as the logistical overhead needed to keep track of different wavelength dependent devices.
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Citations
43 Claims
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1. A main-remote radio base station system, comprising:
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N remote radio units, N being an integer equal to or greater than 2;
a main unit; and
an optical fiber for communicating information between the main unit and the remote units, the optical fiber including a first fiber path for communicating information from the main unit to the remote units and a second fiber path for communicating information from the remote radio units to the main unit, each of the first and second fiber paths including one or more optical links;
wherein the main and remote digital interface units are configured so that information from the main unit is sent over the first fiber path to the remote units so that the same information is transmitted over a radio interface by the remote units at substantially the same time and the main unit receives the same information from each of the remote units over the second fiber path at substantially the same time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for communicating information in a main-remote radio base station system using an optical fiber coupling plural remote radio units and a main unit in a series configuration, comprising:
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determining for each remote radio unit a corresponding delay, and for each remote radio unit, the main unit sending a data signal over a downlink fiber coupling the main unit to the remote radio units in series at an advanced time relative to a time reference so that the data signal is received at each of the remote radio units at substantially the same time despite the different delays associated with each remote radio unit and so that a response to the digital data signal sent by each of the remote radio units is received in the main unit via an uplink fiber at substantially the same time despite the different delays associated with each remote radio unit. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A hybrid radio base station, comprising:
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a main base station unit including;
baseband processing circuitry, and plural near radio units; and
plural remote radio units;
a first fiber path and a second fiber path for coupling the remote radio units and the main base station unit in a series configuration; and
plural digital interface units, one for each near and remote radio unit, coupled to the baseband processing circuitry;
wherein each near radio unit digital interface and each remote radio unit digital interface includes a timing compensator for compensating for a delay associated with that remote radio unit so that a signal received by one of the near radio units and the same signal received by one of the remote radio units may be synchronized for processing in the baseband processing circuitry. - View Dependent Claims (29, 30, 31, 32, 33)
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34. A main unit for use in a main-remote radio base station system, comprising:
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circuitry for communicating with N remote radio units, N being an integer equal to or greater than 2;
a first port configured to connect to one end of a first fiber for communicating information from the main unit to the remote units in series;
a second port configured to connect to the other end of the first fiber or to a second fiber for delivering information from the remote radio units to the main unit;
wherein the circuitry is configured to send information from the main unit over the first fiber to the remote units so that the same information is transmitted over a radio interface by the remote units at substantially the same time. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification