Communication method and system
First Claim
Patent Images
1. A method, comprising:
- receiving at least one pilot signal from at least one of a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system during a predefined idle period dedicated for a control process;
determining a phase difference between at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system on the basis of the at least one pilot signal received from the at least one of the plurality of antenna units;
transmitting phase correction commands to a common base station of the at least one of the plurality of antenna units on the basis of the determined phase difference in order to synchronize carrier phases between the at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system; and
compensating the phase difference between the at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system based on a carrier phase synchronization information received from the base station in response to the transmitted phase correction commands.
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Abstract
There is provided a method comprising: determining a phase difference between at least two antenna units of a distributed antenna system on the basis of at least one pilot signal received from at least one of a plurality of antenna units; and transmitting phase correction commands to a common base station of the plurality of antenna units on the basis of the determined phase difference in order to synchronize carrier phases between at least two antenna units of the distributed antenna system.
30 Citations
33 Claims
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1. A method, comprising:
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receiving at least one pilot signal from at least one of a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system during a predefined idle period dedicated for a control process; determining a phase difference between at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system on the basis of the at least one pilot signal received from the at least one of the plurality of antenna units; transmitting phase correction commands to a common base station of the at least one of the plurality of antenna units on the basis of the determined phase difference in order to synchronize carrier phases between the at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system; and compensating the phase difference between the at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system based on a carrier phase synchronization information received from the base station in response to the transmitted phase correction commands. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A communication system, comprising:
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a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system;
a common base station of the plurality of antenna units;a processing unit configured to determine a phase difference between at least two antenna units on the basis of at least one pilot signal received from at least one of a plurality of antenna units and to provide phase correction commands to the common base station of the plurality of antenna units on the basis of the determined phase difference, wherein the at least one pilot signal is received during a predefined idle period dedicated for a control process; and a synchronizing unit configured to synchronize carrier phases between the at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system on the basis of the transmitted phase correction commands, wherein the synchronizing unit is configured to compensate the phase difference between the at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system based on a carrier phase synchronization information received from the base station in response to the transmitted phase correction commands. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A base station, comprising:
- a processing unit configured to receive phase correction commands relating to a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system, the phase correction commands being determined on the basis of a determined phase difference between at least two antenna units and on the basis of at least one pilot signal from at least one of the plurality of antenna units, wherein the at least one pilot signal is received during a predefined idle period dedicated for a control process; and
a synchronizing unit configured to synchronize carrier phases between at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system on the basis of the received phase correction commands. - View Dependent Claims (16, 17)
- a processing unit configured to receive phase correction commands relating to a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system, the phase correction commands being determined on the basis of a determined phase difference between at least two antenna units and on the basis of at least one pilot signal from at least one of the plurality of antenna units, wherein the at least one pilot signal is received during a predefined idle period dedicated for a control process; and
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18. An antenna unit, comprising:
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one or more antennas of a multiple-input multiple-output (MIMO) distributed antenna system configured to enable transmission and reception of signals; and a processing unit configured to provide a pilot signal to enable determination of a phase difference between at least part of a plurality of antenna units of the multiple-input multiple-output (MIMO) distributed antenna system, and to enable a common base station of the plurality of antenna units to synchronize carrier phases between at least two antenna units on the basis of the determined phase difference, wherein the at least one pilot signal is received during a predefined idle period dedicated for a control process. - View Dependent Claims (19, 20, 21, 22)
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23. A network entity, comprising:
- a receiver configured to receive pilot signals from a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system during predefined idle periods dedicated for a control processes;
a processing unit configured to determine a phase difference between at least two antenna units on the basis of the received pilot signals; and a transmitter configured to transmit phase correction commands to a common base station of the plurality of antenna units on the basis of the determined phase difference in order to synchronize carrier phases between the at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system.
- a receiver configured to receive pilot signals from a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system during predefined idle periods dedicated for a control processes;
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24. A non-transitory computer-readable storage medium encoding instructions for executing a computer process for synchronizing, the process comprising:
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receiving at least one pilot signal from at least one of a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system during a predefined idle period dedicated for a control process; determining a phase difference between at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system on the basis of the at least one pilot signal received from the at least one of the plurality of antenna units; and transmitting phase correction commands to a common base station of the at least one of the plurality of antenna units on the basis of the determined phase difference in order to synchronize carrier phases between the at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system. - View Dependent Claims (25)
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26. A communication system, comprising:
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a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system; a common base station of the plurality of antenna units;
processing means for determining a phase difference between at least two antenna units on the basis of at least one pilot signal received from at least one of the plurality of antenna units and for providing phase correction commands to the common base station of the plurality of antenna units on the basis of the determined phase difference, wherein the at least one pilot signal is received during a predefined idle period dedicated for a control process; andsynchronizing means for synchronizing carrier phases between the at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system on the basis of the transmitted phase correction commands. - View Dependent Claims (27, 28)
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29. An antenna entity, comprising:
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one or more antennas of a multiple-input multiple-output (MIMO) distributed antenna system for enabling transmission and reception of signals; and processing means for providing a pilot signal to enable the determination of a phase difference between at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system, and for enabling a common base station of the one or more antenna units to synchronize carrier phases between at least two antenna units on the basis of the determined phase difference, wherein the at least one pilot signal is received during a predefined idle period dedicated for a control process. - View Dependent Claims (30, 31)
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32. A network entity, comprising:
- receiving means for receiving pilot signals from a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system during predefined idle periods dedicated for a control processes;
transmitting means for transmitting phase correction commands to a common base station of the plurality of antenna units on the basis of the determined phase difference in order to synchronize carrier phases between the at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system.
- receiving means for receiving pilot signals from a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system during predefined idle periods dedicated for a control processes;
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33. A base station, comprising:
- processing means for receiving phase correction commands relating to a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system, the phase correction commands being determined on the basis of a determined phase difference between at least two antenna units and on the basis of at least one pilot signal from at least one of the plurality of antenna units, wherein the at least one pilot signal is received during a predefined idle period dedicated for a control process; and
synchronizing means for synchronizing carrier phases between at least two antenna units of the multiple-input multiple-output (MIMO) distributed antenna system on the basis of the received phase correction commands.
- processing means for receiving phase correction commands relating to a plurality of antenna units of a multiple-input multiple-output (MIMO) distributed antenna system, the phase correction commands being determined on the basis of a determined phase difference between at least two antenna units and on the basis of at least one pilot signal from at least one of the plurality of antenna units, wherein the at least one pilot signal is received during a predefined idle period dedicated for a control process; and
Specification