Adaptive MIMO architecture

• US 8,515,435 B2
• Filed: 01/28/2005
• Issued: 08/20/2013
• Est. Priority Date: 02/13/2004
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Krasny, Leonid, Molnar, Karl, Cheng, Jung-Fu Thomas, Grant, Stephen, Wang, Yi-Pin Eric
• Primary Examiner(s): Agosta, Steve D
• Application Number:
  US11/045,877
• Publication Number:
  US 20050181739A1
• Time in Patent Office: 3,126 Days
• Field of Search: 455/63.1, 455/67.13, 455/101, 455/132, 455/450, 370/208, 370/252, 370/310.2, 370/335, 370/317, 370/322, 370/334, 375/142, 375/147, 375/267, 343/853
• US Class Current: 455/450
• CPC Class Codes: H04B 2201/709727 GRAKE type RAKE receivers
• CPC Class Codes: H04B 7/061 using feedback from receiving side
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/065 Variable contents, e.g. long-term or short-short
• CPC Class Codes: H04B 7/0686 Hybrid systems, i.e. switching and simultaneous transmission
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04B 7/0691 using subgroups of transmit antennas
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/003 Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits
• CPC Class Codes: H04L 1/06 using space diversity

Abstract

An adaptive transmission scheme provides multiple levels of adaptation. At a first level, a selection is made between a limited feedback or limited feedback scheme and a rich feedback scheme. At a second level of adaptation, a diversity mode is selected. Additional levels of adaptation could be employed.

Claims

1. A base station comprising:

a transmitter having a plurality of transmit antennas;

a transmission control circuit operatively coupled to the transmitter and configured to;

select a desired feedback mode to be one of a rich feedback mode and a limited feedback mode based at least in part on past performance of the mobile station in said rich feedback and limited feedback modes, and configure said transmitter to use per antenna rate control if the limited feedback mode is selected;

select a diversity mode by selecting a subset of a set of transmit antennas to use for transmission to the mobile station when the limited feedback mode is selected; and

configure the base station transmitter to use the selected antennas for transmission to said mobile station when the limited feedback mode is selected; and

a receiver to receive a diversity mode selection from a mobile station indicating a selected diversity mode, wherein the transmission control circuit configures the transmitter for the selected diversity mode responsive to receipt of the diversity mode selection from the mobile station.

2. The base station of claim 1 wherein the transmission control circuit further selects a desired feedback mode based at least in part on mobile station capability.

3. The base station of claim 1 wherein the transmission control circuit further selects a desired feedback mode based at least in part on mobile station speed or velocity.

4. The base station of claim 1 wherein the transmission control circuit further selects a desired feedback mode based at least in part on characteristics of the communication channel between the base station and the mobile station.

5. The base station of claim 1 further comprising a receiver to receive an antenna selection from the mobile station indicating a subset of selected antennas to use for transmission to the mobile station, wherein the transmission control circuit configures the transmitter to use the selected antennas.

6. The base station of claim 1 wherein the receiver receives an antenna selection indicating a subset of selected antennas to use for transmission to the mobile station, wherein the transmission control circuit configures the transmitter to use the selected antennas responsive to receipt of the antenna selection from the mobile station.

7. A base station comprising:

a transmitter having a plurality of transmit antennas; and

a transmission control circuit operatively coupled to the transmitter and configured to;

select a desired feedback mode to be one of a rich feedback mode and a limited feedback mode, and configure said transmitter to use matched field transmit diversity if rich feedback mode is selected;

select a diversity mode by selecting a number of data streams to transmit to a mobile station based on channel information feedback from the mobile station when rich feedback mode is selected; and

configure the base station transmitter for the selected diversity mode; and

said channel information feedback including channel coefficients for one or more propagation channels from the transmitter to the mobile station when rich feedback mode is selected.

8. A base station comprising:

a transmitter having a plurality of transmit antennas; and

a transmission control circuit operatively coupled to the transmitter and configured to;

select a desired feedback mode to be one of a rich feedback mode and a limited feedback mode, and configure said transmitter to use matched field transmit diversity if rich feedback mode is selected;

select a diversity mode by selecting a number of data streams to transmit to a mobile station based on channel information feedback from the mobile station when rich feedback mode is selected, and

configure the base station transmitter for the selected diversity mode by configuring a prefilter for each data stream based on said channel information feedback when rich feedback mode is selected.

9. The base station of claim 8 wherein the transmission control circuit configures each prefilter to match a propagation channel from all transmit antennas to a selected receive antenna at the mobile station.

10. A base station comprising:

a transmitter having a plurality of transmit antennas;

a receiver to receive a diversity mode selection from a mobile station indicating a number of data streams to transmit to the mobile station;

a transmission control circuit operatively coupled to the transmitter and configured to;

select a desired feedback mode to be one of a rich feedback mode and a limited feedback mode, and configure said transmitter to use matched field processing transmit diversity if rich feedback mode is selected;

configure the transmitter for a selected diversity mode responsive to receipt of the selected diversity mode from the mobile station by configuring a prefilter for each data stream to match the channel to a selected receive antenna at the mobile station when rich feedback mode is selected.

11. A base station comprising:

a transmitter having a plurality of transmit antennas;

a transmission control circuit operatively coupled to the transmitter for selecting a desired feedback mode to be one of a rich feedback mode and a limited feedback mode based at least in part on past performance of the mobile station in said rich feedback and limited feedback modes, and for configuring said transmitter based on the desired feedback mode; and

a receiver to receive channel information feedback corresponding to the selected feedback mode from a remote terminal, said channel information feedback including channel coefficients for one or more propagation channels from the transmitter to the mobile station.

12. The base station of claim 11 wherein the transmission control circuit further selects a desired feedback mode based at least in part on mobile station capability.

13. The base station of claim 11 wherein the transmission control circuit further selects a desired feedback mode based at least in part on mobile station speed or velocity.

14. The base station of claim 11 wherein the transmission control circuit further selects a desired feedback mode based at least in part on characteristics of the communication channel between the base station and the mobile station.

15. The base station of claim 11 wherein the transmission control circuit configures the transmitter to use a spatial multiplexing coding scheme if the limited feedback mode is selected.

16. The base station of claim 15 wherein the transmission control circuit further selects a diversity mode and configures the base station transmitter for the selected diversity mode.

17. The base station of claim 16 wherein the transmission control circuit selects a diversity mode by selecting a number of transmit antennas to use for transmission to said mobile station when the limited feedback mode is selected.

18. The base station of claim 17 wherein the transmission control circuit selects a diversity mode by selecting a subset of a set of transmit antennas to use for transmission to the mobile station when the limited feedback mode is selected, and wherein the transmission control circuit configures the transmitter to use the selected antennas.

19. The base station of claim 16 wherein said receiver further receives an antenna selection from the mobile station indicating a subset of selected antennas to use for transmission to the mobile station, wherein the transmission control circuit configures the transmitter to use the selected antennas.

20. The base station of claim 15 wherein said receiver further receives a diversity mode selection from a mobile station indicating a selected diversity mode, wherein the transmission control circuit configures the transmitter for the selected diversity mode responsive to receipt of the diversity mode selection from the mobile station.

21. The base station of claim 20 wherein the receiver receives an antenna selection indicating a subset of selected antennas to use for transmission to the mobile station, wherein the transmission control circuit configures the transmitter to use the selected antennas responsive to receipt of the antenna selection from the mobile station.

22. A base station comprising:

a transmitter having a plurality of transmit antennas;

a transmission control circuit operatively coupled to the transmitter for selecting a desired feedback mode to be one of a rich feedback mode and a limited feedback mode, and for configuring said transmitter to use per antenna rate control if the limited feedback mode is selected; and

a receiver configured to;

receive channel information feedback corresponding to the selected feedback mode from a remote terminal, said channel information feedback including channel coefficients for one or more propagation channels from the transmitter to the mobile station; and

receive a diversity mode selection from a mobile station indicating a selected diversity mode, wherein the transmission control circuit configures the transmitter for the selected diversity mode responsive to receipt of the diversity mode selection from the mobile station.

23. The base station of claim 22 wherein the transmission control circuit further selects a diversity mode and configures the base station transmitter for the selected diversity mode.

24. The base station of claim 23 wherein the transmission control circuit selects a diversity mode by selecting a number of transmit antennas to use for transmission to said mobile station when the limited feedback mode is selected.

25. The base station of claim 24 wherein the transmission control circuit selects a diversity mode by selecting a subset of a set of transmit antennas to use for transmission to the mobile station when the limited feedback mode is selected, and wherein the transmission control circuit configures the transmitter to use the selected antennas.

26. The base station of claim 23 wherein said receiver is further configured to receive an antenna selection from the mobile station indicating a subset of selected antennas to use for transmission to the mobile station, wherein the transmission control circuit configures the transmitter to use the selected antennas.

27. The base station of claim 22 wherein the receiver is further configured to receive an antenna selection indicating a subset of selected antennas to use for transmission to the mobile station, wherein the transmission control circuit configures the transmitter to use the selected antennas responsive to receipt of the antenna selection from the mobile station.

28. A base station comprising:

a transmitter having a plurality of transmit antennas;

a transmission control circuit operatively coupled to the transmitter for selecting a desired feedback mode to be one of a rich feedback mode and a limited feedback mode, and for configuring said transmitter to use matched field processing transmit diversity if rich feedback mode is selected; and

a receiver to receive channel information feedback corresponding to the selected feedback mode from a remote terminal, said channel information feedback including channel coefficients for one or more propagation channels from the transmitter to the mobile station.

29. The base station of claim 28 wherein the transmission control circuit selects a diversity mode based on said channel information feedback received from the mobile station and configures the base station transmitter for the selected diversity mode.

30. The base station of claim 29 wherein the transmission control circuit selects a diversity mode by selecting a number of data streams to transmit to the mobile station based on said channel information feedback when the rich feedback mode is selected.

31. The base station of claim 30 wherein the transmission control circuit is further configured to configure the transmitter by configuring a prefilter for each data stream based on said channel information feedback when the rich feedback mode is selected.

32. The base station of claim 31 wherein the transmission control circuit is further configured to configure each prefilter to match a propagation channel from all transmit antennas to a selected receive antenna at the mobile station.

33. The base station of claim 28 wherein said receiver further receives a diversity mode selection from the mobile station indicating a selected diversity mode, wherein the transmission control circuit configures the station transmitter for the selected diversity mode responsive to receipt of a diversity mode selection from the mobile station.

34. The base station of claim 33 wherein the diversity mode selection indicates the number of data streams to transmit to the mobile station, and wherein configuring the base station transmitter includes configuring a prefilter for each data stream when the rich feedback mode is selected.

35. The base station of claim 34 wherein each prefilter is configured to match the channel to a selected receive antenna at the mobile station.