Method and apparatus for converting between a multi-sector, omni-base station configuration and a multi-sector base station configuration

• US 20080287163A1
• Filed: 05/17/2007
• Published: 11/20/2008
• Est. Priority Date: 05/17/2007
• Status: Abandoned Application

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Skarby, Ulf, Lindqvist, Dan Anders, Johansson, Rune, Lindell, Sven Patrik
• Application Number:
  US11/798,921
• Publication Number:
  US 20080287163A1
• Time in Patent Office: Days
• US Class Current: 455/562.1
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A base station includes multiple sector antenna units. Each sector antenna unit has an antenna for receiving a carrier signal associated with an antenna frequency in an available frequency band. The base station is converted between a multiple sector base station configuration and a multi-sector, omni-base station configuration. In a diversity base station implementation, each sector antenna unit receives a diversity signal from a first sector, and the second diversity antenna unit receives a diversity signal from a second different sector. If one sector antenna unit does not perform properly so that one of the sector diversity signals is lost or corrupted, the other sector diversity signal is still useable. The base station may be reconfigured to power-down at least some part of the transmit side without having to power-down some or all of the receive side.

Claims

1. Radio base station apparatus, comprising:

multiple sector antenna units, each of the multiple sector antenna units having an antenna for receiving a carrier signal associated with an antenna frequency in an available frequency band, and

electronic circuitry configured to convert a radio base station between a multiple sector base station configuration, where each sector antenna unit is connected to an associated filtering unit and an associated radio unit in a base station unit, and a multi-sector omni-base station configuration, where at least two of the sector antenna units share a common filtering unit connected to a common radio unit in the base station unit.

2. The apparatus in claim 1, further comprising:

a frequency converter for frequency converting the carrier signal received by one of the multiple antenna units from the antenna frequency to a respective frequency different from the antenna frequency, where at least two of the carrier signals associated with the multiple antenna units and combined in the combiner are at a different frequency,

wherein for the multi-sector omni-base station configuration, the electronic circuitry is configured to combine different frequency carrier signals associated with each of the multiple antenna units into a composite signal and provide the composite signal onto a feeder connected to a base station unit, and

wherein for the multi-sector base station configuration, the electronic circuitry is configured to provide a signal associated with each of the multiple antenna units onto a respective one of multiple feeders connected to the base station unit.

3. The apparatus in claim 2, wherein for the multi-sector omni-base station configuration, each radio unit includes a frequency downconverter for extracting from the composite signal a respective one of the carrier signals corresponding to the multiple sector antenna units, each frequency downconverter including one or more base station mixers configured to frequency convert a corresponding one of the respective carrier signals associated with a different frequency to an intermediate frequency or to baseband for further processing.

4. The apparatus in claim 2, wherein for the multi-sector omni-base station configuration, the number of multiple sector antenna units having a corresponding frequency converter is less than the number of multiple sector antenna units.

5. The apparatus in claim 2, wherein for the multi-sector omni-base station configuration, the number of multiple sector antenna units having a corresponding frequency converter is the same as the number of multiple sector antenna units.

6. The apparatus in claim 2, wherein for the multi-sector omni-base station configuration, the electronic circuitry is configured to combine carrier signals associated with each of the multiple antenna units to create a composite signal in which all of the carrier signals combined are associated with a different frequency.

7. The apparatus in claim 2, wherein for the multi-sector omni-base station configuration, the electronic circuitry is configured to combine carrier signals associated with each of the multiple antenna units to create a composite signal in which some of the carrier signals to be combined are at a different frequency.

8. The apparatus in claim 2, wherein in the multi-sector omni-base station configuration, the electronic circuitry includes switching circuitry controllable to connect one or more of the sector signals to the feeder so that multiple sector signals are connected to the base station via the feeder.

9. The apparatus in claim 1, wherein for the multi-sector omni-base station configuration, if there are multiple respective different frequency bands, then those respective different frequencies are distributed over the available frequency band.

10. The apparatus in claim 1, wherein each antenna unit is a tower mounted amplifier (TMA) unit including a receiver filter corresponding to the available bandwidth connected to an amplifier for amplifying the received signal.

11. The apparatus in claim 1, further comprising multiple feeders and multiple radio units, wherein for the multi-sector base station configuration, the electronic circuitry is configured to route a signal from each of the multiple sector antenna units over a respective one of the feeders connected to a respective radio unit.

12. The apparatus in claim 11, wherein the electronic circuitry is configured to power-down one or more of the respective filtering units and/or radio unit including a power amplifier when the base station is configured in a multi-sector omni-base station configuration.

13. The apparatus in claim 1, wherein each sector antenna unit is connected to a first diversity antenna and a second diversity antenna, and wherein for the multi-sector omni-base station configuration, the electronic circuitry is configured to combine signals associated with each sector'"'"'s first diversity antenna to create a first composite signal and provide the first composite signal onto a first feeder connected to the base station unit, to combine signals associated with each sector'"'"'s second diversity antennas to create a second composite signal, and to provide the second composite signal onto a second feeder connected to the base station unit.

14. Radio base station apparatus, comprising:

multiple sector antenna units coupled to a base station unit, each of the multiple sector antenna units having an antenna for receiving a carrier signal associated with an antenna frequency in an available frequency band, and

wherein each sector antenna unit is connected to a first diversity antenna signal from one sector and a second diversity antenna signal from a different sector.

15. The apparatus in claim 14, further comprising:

electronic circuitry configured to convert a radio base station between a multiple sector base station configuration, where each sector antenna unit is connected to an associated filtering unit and an associated radio unit in the base station unit, and a multi-sector omni-base station configuration, where at least two of the sector antenna units share a common filtering unit connected to a common radio unit in the base station unit.

16. The apparatus in claim 15, wherein for the multi-sector omni-base station configuration, the electronic circuitry is configured to combine signals from the sector antenna units at different frequencies to create a composite signal and provide the composite signal onto a feeder connected to the common filtering unit and receiver, and wherein the common receiver includes frequency conversion circuitry for extracting individual ones of the sector diversity signals.

17. The apparatus in claim 16, wherein the base station unit includes a local oscillator associated with each sector, and wherein for the multi-sector omni-base station configuration, the electronic circuitry is configured to use a same one of the local oscillators to extract from the composite signal diversity signals from the same sector.

18. Radio base station apparatus, comprising:

multiple sector antenna units, each of the multiple sector antenna units having an antenna for receiving a carrier signal associated with an antenna frequency in an available frequency band;

multiple base station transceivers, each transceiver having transmission circuitry and receiving circuitry, and each sector antenna unit being connectable to one of the multiple base station transceivers; and

electronic circuitry configured to selectively power down at least a part of the transmission circuitry for a desired time interval without having to power down at least a part of the receiving circuitry.

19. The apparatus in claim 18, further comprising a transmission splitter, wherein each sector antenna unit includes a receiving filter and a transmission filter, and wherein the electronic circuitry is configured to selectively switch between a first power saving mode, where the transmission splitter is activated and a transmission signal from one transmitter is provided to the transmission filter in two or more sector antenna units, and a second higher power mode, where the transmission splitter is deactivated and a transmission signal from two or more transmitters is provided to a respective transmission filter in two or more sector antenna units.

20. The apparatus in claim 18, further comprising switches controllable by the electronic circuitry to switch in or out the transmission circuitry.

21. The apparatus in claim 18, wherein each sector antenna unit includes diversity antennas, and wherein each sector antenna unit is connected to a first diversity antenna signal from one sector and a second diversity antenna signal from a different sector.

22. A method for use in a radio base station, comprising:

receiving a carrier signal associated with an antenna frequency in an available frequency band at each of the multiple sector antenna units, each sector antenna unit being connected to an antenna, and

in response to a control signal, automatically converting the radio base station between a multiple sector base station configuration, where each sector antenna unit is connected to an associated filtering unit and an associated radio unit in a base station unit, and a multi-sector omni-base station configuration, where at least two of the sector antenna units share a common filtering unit connected to a common radio unit in the base station unit.

23. The method in claim 22, further comprising:

frequency converting the carrier signal received by one of the multiple antenna units from the antenna frequency to a respective frequency different from the antenna frequency, where at least two of the carrier signals associated with the multiple antenna units and combined in the combiner are at a different frequency,

wherein for the multi-sector omni-base station configuration, the method further comprises;

combining different frequency carrier signals associated with each of the multiple antenna units into a composite signal, and

providing the composite signal onto a feeder connected to a base station unit, and

wherein for the multi-sector base station configuration, the method further comprises providing a signal associated with each of the multiple units onto a respective one of multiple feeders connected to the base station unit.

24. The method in claim 23, wherein for the multi-sector omni-base station configuration, each receiving unit extracting from the composite signal a respective one of the carrier signals corresponding to the multiple sector antenna units using a frequency downconverter to frequency convert a corresponding one of the respective carrier signals associated with a different frequency to an intermediate frequency or to baseband for further processing.

25. The method in claim 23, wherein for the multi-sector omni-base station configuration, the number of multiple sector antenna units having a corresponding frequency converter is less than the number of multiple sector antenna units.

26. The method in claim 23, wherein for the multi-sector omni-base station configuration, the number of multiple sector antenna units having a corresponding frequency converter is the same as the number of multiple sector antenna units.

27. The method in claim 23, wherein for the multi-sector omni-base station configuration, the method further comprises combining carrier signals associated with each of the multiple antenna units to create a composite signal in which all of the carrier signals combined are associated with a different frequency.

28. The method in claim 23, wherein for the multi-sector omni-base station configuration, the further comprises combining carrier signals associated with each of the multiple antenna units to create a composite signal in which some of the carrier signals to be combined are at a different frequency.

29. The method in claim 23, wherein in the multi-sector omni-base station configuration, the method further comprises switchably connecting one or more of the sector signals to the feeder so that multiple sector signals are connected to the base station via the feeder.

30. The method in claim 22, wherein the base station includes multiple feeders and multiple radio units, and wherein for the multi-sector omni-base station configuration, the method further comprises powering-down one or more of the filtering units and/or radio units.

31. The method in claim 22, wherein the base station includes multiple feeders and multiple radio units, and wherein for the multi-sector base station configuration, the method further comprises routing a signal from each of the multiple sector antenna unit over a respective one of the feeders connected to a respective radio unit that includes a power amplifier.

32. The method in claim 22, further comprising powering-down one or more of the respective receiving units when the base station is configured in a multi-sector omni-base station configuration.

33. The method in claim 22, wherein each sector antenna unit is connected to a first diversity antenna and a second diversity antenna, and wherein for the multi-sector omni-base station configuration, the method further comprises

combining signals associated with each sector'"'"'s first diversity antenna to create a first composite signal and provide the first composite signal onto a first feeder connected to the base station unit,

combining signals associated with each sector'"'"'s second diversity antennas to create a second composite signal, and

providing the second composite signal onto a second feeder connected to the base station unit.

34. A method for use in a radio base station, comprising:

receiving a carrier signal associated with an antenna frequency in an available frequency band at each one of multiple sector antenna units, each sector antenna unit being connected to an antenna and to a base station unit,

wherein each sector antenna unit is connected to a first diversity antenna signal from one sector and a second diversity antenna signal from a different sector.

35. The method in claim 34, further comprising:

in response to a control signal, automatically converting the radio base station between a multiple sector base station configuration, where each sector antenna unit is connected to an associated filtering unit and an associated radio unit in a base station unit, and a multi-sector omni-base station configuration, where at least two of the sector antenna units share a common filtering unit connected to a common radio unit in the base station unit,

wherein for the multi-sector omni-base station configuration, the method further comprises;

combining signals from the sector antenna units at different frequencies to create a composite signal,

providing the composite signal onto a feeder connected to the common filtering unit and receiver, and

extracting individual ones of the sector diversity signals at the receiver.

36. The method in claim 35, wherein the base station unit includes a local oscillator associated with each sector, and wherein for the multi-sector omni-base station configuration, the method further comprises using a same one of the local oscillators to extract from the composite signal diversity signals from the same sector.

37. A method for use in a radio base station including multiple sector antenna units, each of the multiple sector antenna units having an antenna for receiving a carrier signal associated with an antenna frequency in an available frequency band, and multiple base station transceivers, each transceiver having transmission circuitry and receiving circuitry, and each sector antenna unit being connectable to one of the multiple base station transceivers, the method comprising:

selectively powering down the transmission circuitry for a desired time interval without having to power down the receiving circuitry.

38. The method in claim 37, wherein the radio base station includes a transmission splitter and each sector antenna unit includes a receiving filter and a transmission filter, the method further comprising:

selectively switching between a first power saving mode, where the transmission splitter is activated and a transmission signal from one transmitter is provided to the transmission filter in two or more sector antenna units, and a second higher power mode, where the transmission splitter is deactivated and a transmission signal from two or more transmitters is provided to a respective transmission filter in two or more sector antenna units.

39. The method in claim 37, wherein each sector antenna unit includes diversity antennas, the method further comprising:

connecting each sector antenna unit to a first diversity antenna signal from one sector and to a second diversity antenna signal from a different sector.