Flexible multi-sector multiple antenna system

• US 20060234777A1
• Filed: 04/18/2005
• Published: 10/19/2006
• Est. Priority Date: 04/18/2005
• Status: Abandoned Application

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Savas, Alpaslan G., Vannithamby, Rath, Yoon, Young C.
• Application Number:
  US11/108,323
• Publication Number:
  US 20060234777A1
• Time in Patent Office: Days
• US Class Current: 455/562.100
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0491 using two or more sectors, i.e. sector diversity
• CPC Class Codes: H04B 7/0608 Antenna selection according to transmission parameters
• CPC Class Codes: H04B 7/061 using feedback from receiving side
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A radio access network having multiple sectors comprises two or more sector transmitters serving respective sectors for transmitting data to mobile stations; a plurality of antennas, each antenna assigned to a respective sector transmitter; and a antenna management processor controlling sector antenna assignments and operative to dynamically reassign a sector antenna associated with a sector transmitter in a first sector to a sector transmitter in a second sector.

Claims

1. A radio access network including multiple sectors comprising:

two or more sector transmitters serving respective sectors for transmitting data to mobile stations;

a plurality of antennas, each antenna assigned to a respective sector transmitter; and

an antenna management processor controlling sector antenna assignments and operative to dynamically reassign a sector antenna associated with a sector transmitter in a first sector to a sector transmitter in a second sector.

2. The radio access network of claim 1 wherein said sector transmitters use multiple sector antennas to transmit packet data to a plurality of mobile stations over a shared packet data channel.

3. The radio access network of claim 2 wherein said sector transmitter includes a multiplexer for dividing a data stream for a selected mobile station into a plurality of substreams to be transmitted over different sector antennas.

4. The radio access network of claim 3 wherein at least one of said data streams is transmitted from two or more sector antennas.

5. The radio access network of claim 2 further comprising a scheduler associated with each sector transmitter to schedule packet data transmissions from the assigned sector antennas to a plurality of mobile stations over said shared packet data channel.

7. The radio access network of claim 5 wherein said scheduler schedules all assigned sector antennas together as a unit so that at any given time only one mobile station receives packet data transmissions over the packet data channel of all sector antennas assigned to a sector.

8. The radio access network of claim 5 wherein said scheduler is operative to schedule less than all the assigned sector antennas to a first mobile stations, and the remaining sector antennas to one or more other mobile stations so that two or more mobile stations can concurrently receive packet data over said packet data channel.

9. The radio access network of claim 8 wherein the scheduler independently schedules the assigned sector antennas.

10. The radio access network of claim 1 wherein the antenna management processor determines sector antenna assignment based on sector loading.

11. The radio access network of claim 1 wherein the antenna management processor determines sector antenna assignment based on channel conditions from said sector antenna and to one or more mobile stations.

12. The radio access network of claim 11 wherein the antenna management processor reassigns a sector antenna assigned to a sector transmitter in a first sector to a sector transmitter in a second sector based on a comparison of the channel conditions to mobile stations in the different sectors.

13. The radio access network of claim 12 wherein the antenna management processor reassigns a sector antenna associated with a sector transmitter in a first sector to a sector transmitter in a second sector when the channel conditions from the sector antenna to a mobile station in the second sector are determined to be more favorable than the channel conditions to a mobile station in the first sector.

6. The radio access network of 5 wherein the scheduler jointly schedules the sector antennas.

14. A method implemented in a radio access network having two or more sector transmitters for transmitting data to mobile stations, said method comprising:

assigning each one of a plurality of sector antennas to a respective sector transmitter; and

dynamically reassigning a sector antenna associated with a sector transmitter in a first sector to a sector transmitter in a second sector.

15. The method of claim 14 further comprising dividing data to be transmitted to a selected mobile station into two or more substreams and transmitting each substream over different sector antennas.

16. The method of claim 15 wherein at least one of said substreams is transmitted from two or more sector antennas.

17. The method of claim 15 wherein said data is transmitted over a shared packet data channel, and further comprising scheduling transmissions to said mobile stations over said shared packet data channel.

23. The method of claim 14 wherein dynamically reassigning a sector antenna associated with a sector transmitter in a first sector to a sector transmitter in a second sector comprises determining sector antenna assignment based on sector loading.

24. The method of claim 14 wherein dynamically reassigning a sector antenna comprises determining sector antenna assignment based on channel conditions between said sector antennas and said mobile stations.

25. The method of claim 24 wherein determining sector antenna assignment based on channel conditions between said sector antennas and said mobile stations comprises comparing channel conditions between a sector antenna and mobile stations in two or more sectors.

26. The method of claim 25 wherein dynamically reassigning a sector antenna comprises reassigning a sector antenna associated with a sector transmitter in a first sector to a sector transmitter in a second sector when the channel conditions from the sector antenna to a mobile station in the second sector are determined to be more favorable than the channel conditions to a mobile station in the first sector.

18. The method of 17 wherein scheduling transmissions to said mobile stations over said shared packet data channel comprises scheduling mobile stations to receive packet data transmissions over said shared packet data channel one at a time using all assigned sector antennas.

19. The method of 17 wherein scheduling transmissions to said mobile stations over said shared packet data channel comprises scheduling two or more mobile stations to receive packet data transmissions over said packet data channel at one time.

20. The method of claim 19 further comprising selecting sector antennas for transmitting data to each mobile station.

21. The method of claim 20 wherein selecting sector antennas for transmitting data to each mobile station comprises independently scheduling each sector antenna.

22. The method of claim 20 wherein selecting sector antennas for transmitting data to each mobile station comprises jointly scheduling said sector antennas.