Mobile communication apparatus and method including base station and mobile station having muti-antenna

• US 20070049208A1
• Filed: 08/15/2006
• Published: 03/01/2007
• Est. Priority Date: 10/19/2002
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Ho-Jin, Kim, Ki-ho, Kim, Sung-Jin, Li, Jun
• Granted Patent: US 7,650,167 B2
• Time in Patent Office: Days
• US Class Current: 455/69
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0634 Antenna weights or vector/matrix coefficients
• CPC Class Codes: H04W 72/535 based on resource usage policies

Abstract

A mobile communication apparatus that utilizes multiple base station/mobile station antennas and a mobile communication method performed therein are provided. The mobile communication apparatus includes a base station having at least two antennas and at least two mobile stations having at least one antenna, respectively. The base station restores weight information and channel status information from feedback signals received from the mobile stations, determines downlink investigation information that results in maximum transmission channel capacity based on the restored weight information and channel status information, selects mobile stations for simultaneous transmission based on the downlink investigation information, and processes data to be transmitted to the selected mobile stations based on the downlink investigation information.

Claims

2. (canceled)

3. (canceled)

4. (canceled)

5. (canceled)

6. (canceled)

7. (canceled)

8. (canceled)

9. (canceled)

36. The base station of claim 9, wherein the maximum transmission channel capacity is calculated in consideration of packet fairness between the mobile stations.

10. (canceled)

11. (canceled)

12. (canceled)

13. (canceled)

14. (canceled)

15. (canceled)

16. (canceled)

17. (canceled)

18. (canceled)

19. (canceled)

20. (canceled)

21. (canceled)

22. (canceled)

23. (canceled)

24. (canceled)

25. (canceled)

26. (canceled)

27. (canceled)

28. A base station comprising:

at least two base station antennas, and

the base station restoring weight information and channel status information from feedback signals received from a first plurality of mobile stations, determining downlink investigation information that results in maximum transmission channel capacity based on the restored weight information and channel status information, selecting a second plurality of mobile stations for simultaneous transmission from among the first plurality of mobile stations based on the downlink investigation information, and processing data to be transmitted to the selected mobile stations based on the downlink investigation information.

29. The base station of claim 28, wherein the maximum transmission channel capacity is calculated in consideration of packet fairness between the mobile stations.

30. The base station of claim 28, wherein the base station comprises:

a feedback information restoration unit that restores the weight information and channel status information received from each of the mobile stations through the base station antennas and outputs the restored weight information and channel status information;

a downlink investigation information generation unit that generates the downlink investigation information based on the restored weight information and channel status information in an investigation section prior to packet transmission to mobile stations;

a mobile station data selection unit that selects data regarding the mobile stations for simultaneous transmission from among data regarding all of the mobile stations based on the downlink investigation information received from the downlink investigation information generation unit;

a basis multiplication unit that performs matrix-multiplication and summation on the data regarding the mobile stations for simultaneous transmission, which are selected by the mobile station data selection unit, and the downlink investigation information, and outputs the results as data signals; and

an addition unit that adds pilot channel signals to the data signals and downlink investigation information, and outputs the added results,

wherein the added results are transmitted in units of a frame through the base station antennas to the mobile stations.

31. The base station of claim 30, wherein the base station further comprises a mobile station fairness control unit that generates mobile station fairness information and outputs the mobile station fairness information to the downlink investigation information generation unit.

32. The base station of claim 30, wherein the downlink investigation information generation unit comprises:

a multiplication portion that generates channel information by multiplying the restored weight information and channel status information received from the feedback information restoration unit;

an index setting portion that indices all possible combinations of the mobile stations;

a sub-part combination portion that combine the channel information into sub-parts with reference to the indices assigned by the index setting portion;

a mutual weight information generation portion that generates mutual weight information based on the results of the combination performed in the sub-part combination portion;

a channel capacity calculation portion that calculate transmission channel capacities based on the results of the combination received from the sub-part combination portion and the mutual weight information received from the mutual weight information generation portion;

a storage portion that stores the transmission channel capacities regarding all of the mobile stations, which are output from the channel capacity calculation portion, the mutual weight information output from the mutual weight information generation portion, and the indices received from the index setting portion; and

a maximum values search unit that compares the transmission channel capacities stored in the storage portion and extract indices that correspond to the maximum transmission channel capacity.

33. The base station of claim 31, wherein the downlink investigation information generation unit comprises:

a multiplication portion that generates channel information by multiplying the restored weight information and channel status information received from the feedback information restoration unit;

an index setting portion that indices all possible combinations of the mobile stations;

a sub-part combination portion that combine the channel information and mobile station fairness information into sub-parts with reference to the indices assigned by the index setting portion;

a mutual weight information generation portion that generates mutual weight information based on the results of the combination performed in the sub-part combination portion;

a channel capacity calculation portion that calculate transmission channel capacities based on the results of the combination received from the sub-part combination portion and the mutual weight information received from the mutual weight information generation portion;

a storage portion that stores the transmission channel capacities regarding all of the mobile stations, which are output from the channel capacity calculation portion, the mutual weight information output from the mutual weight information generation portion, and the indices received from the index setting portion; and

a maximum values search unit that compares the transmission channel capacities stored in the storage portion and extract indices that correspond to the maximum transmission channel capacity.

34. The base station of claim 30, wherein the mutual weight information is quantized to a degree that is suitable to be fed back and then provided to the channel capacity calculation portion.

35. A base station comprising:

at least two base station antennas,

the base station restoring weight information and channel status information from feedback signals received from a first plurality of mobile stations, determining downlink investigation information that results in maximum transmission channel capacity based on the restored weight information and channel status information, selecting mobile stations for simultaneous transmission from among the first plurality of mobile stations based on the downlink investigation information, determining downlink tracking information based on the channel downlink investigation information and restored weight information and channel status information regarding the selected mobile stations, and processing data to be transmitted to the selected mobile stations based on the downlink tracking information.

38. The base station of claim 35, wherein the base station comprises:

a feedback information restoration unit that restores the weight information and channel status information received from each of the mobile stations through the base station antennas and outputs the restored weight information and channel status information;

a downlink investigation information generation unit that generates the downlink investigation information based on the restored weight information and channel status information in an investigation section prior to packet transmission to mobile stations;

a downlink tracking information generation unit that generates the downlink tracking information based on the restored weight information and channel status information and the downlink investigation information received from the downlink investigation information generation unit in a tracking section for packet transmission to the mobile stations;

a mobile station data selection unit that selects data regarding the mobile stations for simultaneous transmission from among data regarding all of the mobile stations based on the downlink investigation information received from the downlink investigation information generation unit;

a basis multiplication unit that performs matrix-multiplication and summation on the data regarding the mobile stations for simultaneous transmission, which are selected by the mobile station data selection unit, and the downlink tracking information output from the downlink tracking information generation unit, and outputs the results as data signals; and

an addition unit that adds pilot channel signals to the data signals and downlink investigation information, and outputs the added results,

wherein the added results are transmitted in units of a frame through the base station antennas to the mobile stations.

39. The base station of claim 38, wherein the base station further comprises a mobile station fairness control unit that generates mobile station fairness information and outputs the mobile station fairness information to the downlink investigation information generation unit.

40. The base station of claim 38, wherein the downlink investigation information generation unit comprises:

a multiplication portion that generates channel information by multiplying the restored weight information and channel status information received from the feedback information restoration unit;

an index setting portion that indices all possible combinations of the mobile stations;

a sub-part combination portion that combine the channel information into sub-parts with reference to the indices assigned by the index setting portion;

a mutual weight information generation portion that generates mutual weight information based on the results of the combination performed in the sub-part combination portion;

a channel capacity calculation portion that calculates transmission channel capacities based on the results of the combination received from the sub-part combination portion and the mutual weight information received from the mutual weight information generation portion;

a storage portion that stores the transmission channel capacities regarding all of the mobile stations, which are output from the channel capacity calculation portion, the mutual weight information output from the mutual weight information generation portion, and the indices received from the index setting portion; and

a maximum values search unit that compares the transmission channel capacities stored in the storage portion and extract indices that correspond to the maximum transmission channel capacity.

41. The base station of claim 39, wherein the downlink investigation information generation unit comprises:

a multiplication portion that generates channel information by multiplying the restored weight information and channel status information received from the feedback information restoration unit;

an index setting portion that indices all possible combinations of the mobile stations;

a sub-part combination portion that combine the channel information and mobile station fairness information into sub-parts with reference to the indices assigned by the index setting portion;

a mutual weight information generation portion that generates mutual weight information based on the results of the combination performed in the sub-part combination portion;

a channel capacity calculation portion that calculates transmission channel capacities based on the results of the combination received from the sub-part combination portion and the mutual weight information received from the mutual weight information generation portion;

a storage portion that stores the transmission channel capacities regarding all of the mobile stations, which are output from the channel capacity calculation portion, the mutual weight information output from the mutual weight information generation portion, and the indices received from the index setting portion; and

a maximum values search unit that compares the transmission channel capacities stored in the storage portion and extract indices that correspond to the maximum transmission channel capacity.

42. The base station of claim 40, wherein the mutual weight information is quantized to a degree that is suitable to be fed back and then provided to the channel capacity calculation portion.

43. The base station of claim 38, wherein the downlink tracking information generation unit comprises:

a channel information sub-part selection portion that selects weight information and channel status information regarding mobile stations that correspond to the downlink investigation information received from the downlink investigation information generation unit from among the restored weight information and channel status information received from the feedback information restoration unit;

a multiplication portion that multiplies the weight information and channel status information received from the channel information sub-part selection portion; and

a mutual weight information generation portion that generates the downlink tracking information, which is mutual weight information, based on the product received from the multiplication portion.

44. The base station of claim 43, wherein the mutual weight information is quantized to a degree that is suitable to be fed back.

37. A mobile station, comprising:

at least one mobile station antenna, and

the mobile station measuring downlink characteristics of multiple base station/mobile station antenna channels based on pilot channel signals transmitted from a base station, determining weight information and channel status information based on the downlink characteristics, converting the determined weight information and channel status information into feedback signals, transmitting the feedback signals to the base station, and detecting high-speed downlink shared channel (HS-DSCH) signals in units of a frame based on the downlink characteristics, and a first control signal and data signals, which are transmitted from the base station.

45. The mobile station of claim 37, wherein the mobile stations comprises:

a channel characteristics measurement unit that measures the downlink characteristics based on the pilot channel signals received through the mobile station antenna;

a channel information determination unit that determines weight information and channel status information that maximizes transmission capacity based on the downlink characteristics, which are compressed to be fed back;

an information feedback unit that converts the weight information and channel status information received from the channel information determination unit into the feedback signals and transmits the feedback signals through the mobile station antennal to the base station;

a control information restoration unit that compensates for a distortion of the first control signal received from the base station based on the downlink characteristics and restores a second control signal from the distortion-compensated first control signal, the second control signal including information as to whether the data signals are from a desired basis matrix and information on the number of bits included;

a data information restoration unit that restores data information that is received from every basis from the data signals received from the base station and the downlink characteristics;

a data information selection unit that selects data information received from the desired basis matrix from among the data information received from all of the basis matrices in response to the second control signal, and outputs the selected data information; and

a data information combination unit that combines the selected data information received from the data information selection unit and outputs the combined results as the high-speed downlink shared channel (HS-DSCH) signals.

46. A method of mobile communications performed in a base station including at least two base station antennas, the method comprising:

(a) restoring weight information and channel status information from feedback signals received from a first plurality of mobile stations;

determining downlink investigation information that results in maximum transmission channel capacity based on the restored weight information and channel status information;

selecting a second plurality of mobile stations for simultaneous transmission from among the first plurality of mobile stations based on the downlink investigation information; and

processing data to be transmitted to the selected mobile stations based on the downlink investigation information.

49. The method of claim 46, wherein the maximum transmission channel capacity is calculated in consideration of packet fairness between the mobile stations.

50. The method of claim 46, wherein step (a) performed in the base station comprises:

(a1) restoring the weight information and channel status information received from each of the mobile stations through the base station antennas;

(a2) generating the downlink investigation information based on the restored weight information and channel status information;

(a3) selecting data regarding the mobile stations for simultaneous transmission from among data regarding all of the mobile stations based on the downlink investigation information;

(a4) performing matrix-multiplication and summation on the data regarding the mobile stations for simultaneous transmission and the downlink investigation information and determining the results as data signals; and

(a5) adding pilot channel signals to the data signals and downlink investigation information, and transmitting the added results in units of a frame through the base station antennas to the mobile stations.

51. The method of claim 50, wherein step (a) further comprises (a6) generating mobile station fairness information that is considered when generating the downlink investigation information.

47. A method of mobile communications performed in a base station including at least two base station antennas, the method comprising:

(a) restoring weight information and channel status information from feedback signals received from of mobile stations;

determining downlink investigation information that results in maximum transmission channel capacity based on the restored weight information and channel status information;

selecting a second plurality of mobile stations for simultaneous transmission from among the first plurality of mobile stations based on the downlink investigation information;

determining downlink tracking information based on the channel downlink investigation information and restored weight information and channel status information regarding the selected mobile stations; and

processing data to be transmitted to the selected mobile stations based on the downlink tracking information.

54. The method of claim 47, wherein the maximum transmission channel capacity is calculated in consideration of packet fairness between the mobile stations.

48. A method of mobile communications performed in a mobile station, the method comprising:

measuring downlink characteristics of multiple base station/mobile station antenna channels based on pilot channel signals transmitted from a base station;

determining weight information and channel status information based on the downlink characteristics;

converting the determined weight information and channel status information into the feedback signals;

transmitting the feedback signals to the base station; and

detecting high-speed downlink shared channel (HS-DSCH) signals in units of a frame based on the downlink characteristics, and a first control signal and data signals, which are transmitted from the base station.

52-1. The method of claim 52, wherein step (a) further comprises (a7) generating mobile station fairness information that is considered when generating the downlink investigation information.