Data transmission method and radio system

• US 20060135063A1
• Filed: 02/08/2006
• Published: 06/22/2006
• Est. Priority Date: 12/21/1998
• Status: Abandoned Application

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: Katz, Marco
• Application Number:
  US11/349,257
• Publication Number:
  US 20060135063A1
• Time in Patent Office: Days
• US Class Current: 455/25
• CPC Class Codes: H04B 7/061 using feedback from receiving side
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme

Abstract

The invention relates to a data transmission method and a radio system comprising at least one subscriber terminal and at least one base station including an antenna, by means of which the base station transmits signals to the subscriber terminal. The subscriber terminal includes a measuring mechanism which determines the quality of the signals received by the subscriber terminal by comparing the received signals with at least one signal quality threshold level. When only one signal exceeds the threshold, the subscriber terminal sends to the base station, which transmitted the signal that exceeded the threshold, a command to use, when transmitting a signal to the subscriber terminal, the antenna with which the signal that exceeded the threshold was transmitted, or the transmission direction to which the signal that exceeded the threshold was transmitted.

Claims

1. A data transmission method used in a radio system comprising a subscriber terminal and at least one base station which transmits signals to the subscriber terminal by means of its antenna, the method comprising:

determining the quality of signals received by the subscriber terminal by comparing the received signals with at least one signal quality threshold level,

sending to the base station, which transmitted a signal that exceeded the threshold, information on the antennas which transmitted the signal that exceeded the threshold, or information on transmission directions from which the signal that exceeded the threshold were received, and

selecting from the antennas, from which the signal that exceeded the threshold was received, a transmission direction or directions, in which to continue transmission of the signal to said subscriber terminal.

3. A method as claimed in claim 1, wherein when the quality of several signals is within acceptable levels, information on the quality of the signals is sent to the base station, and the base station can, on the basis of the information, decide which antenna or direction it will use to continue transmitting signals.

6. A method as claimed in claim 1, wherein if the quality of a signal received by the subscriber terminal is below a lowest acceptable quality level, information on the quality of that signal is sent to the base station which, after receiving the information, interrupts transmission of that signal.

7. A method as claimed in claim 1, wherein signals are transmitted to the subscriber terminal by means of beams, and a final decision on the transmission antenna, transmission direction or beam to be used by the base station is made in the base station.

9. A method as claimed in claim 1, wherein the transmission beam of the base station causing the least interference is selected and the selection decision is made in the base station.

2. A data transmission method used in a radio system comprising a subscriber terminal and at least one base station which transmits signals to the subscriber terminal by means of its antenna, the method comprising:

determining the quality of signals received by the subscriber terminal by comparing the received signals with at least one signal quality threshold level, and

when only one signal exceeds the threshold, sending to the base station, which transmitted the signal that exceeded the threshold, a command to use, when transmitting a signal to said subscriber terminal a transmission direction in which the signal that exceeded the threshold was transmitted.

8. A method as claimed in claim 2, wherein the signals are transmitted to the subscriber terminal by means of beams, and a final decision on the transmission antenna, transmission direction or beam to be used by the base station is made in the subscriber terminals.

10. A method as claimed in claim 2, wherein the transmission beam of the base station causing the least interference is selected and the selection decision is made in the subscriber terminal.

4. (canceled)

5. (canceled)

11. A radio system comprising at least one subscriber terminal and at least one base station comprising an antenna by means of which the base station transmits signals to the subscriber terminal, wherein

the subscriber terminal comprises a measuring means which determines the quality of signals received by the subscriber terminal by comparing the received signals with at least one signal quality threshold level,

the subscriber terminal sends to the base station, which transmitted a signal that exceeded the threshold, information on the antennas by which the signal that exceeded the threshold were transmitted, or information on transmission directions from which the signal that exceeded the threshold were received,

the base station comprises a means which selects from transmission directions of the signal, which exceeded the threshold, a transmission direction or directions in which the base station continues to transmit the signal.

13. A radio system as claimed in claim 11, wherein when the quality of several signals is within acceptable levels, the subscriber terminal sends to the base station information, on the basis of which the base station can decide which antenna or direction the base station will use to continue transmitting the signal.

16. A radio system as claimed in claim 11, wherein if the quality of a signal received by the subscriber terminal is below a lowest acceptable quality level, the subscriber terminal sends information on the quality of that signal to the base station which, after receiving the information, stops transmitting that signal with the antenna by which the signal that was below the threshold was transmitted.

17. A radio system as claimed in claim 11, wherein the base station transmits signals to the subscriber terminal by means of beams, and a final decision on the transmission antenna, transmission direction or beam to be used in the base station is made in the base station.

19. A radio system as claimed in claim 11, wherein the base station comprises a means which selects as the transmission beam of the base station the transmission beam causing the least interference.

12. A radio system comprising at least one subscriber terminal and at least one base station comprising an antenna by means of which the base station transmits signals to the subscriber terminal, wherein

the subscriber terminal comprises a measuring means which determines the quality of signals received by the subscriber terminal by comparing the received signals with at least one signal quality threshold level, and

when only one signal exceeds the threshold, the subscriber terminal sends to the base station, which transmitted the signal that exceeded the threshold, a command to use, when transmitting a signal to said subscriber terminal, a transmission direction in which the signal that exceeded the threshold was transmitted.

18. A radio system as claimed in claim 12, wherein the base station transmits signals to the subscriber terminal by means of beams, and a final decision on the transmission antenna, transmission direction or beam to be used in the base station (is made in the subscriber terminal.

20. A radio system as claimed in claim 12, wherein the subscriber terminal comprises a means which selects as the transmission beam of the base station the transmission beam causing the least interference.

14. (canceled)

15. (canceled)

21. A base station, comprising:

means for receiving information on transmission directions from which a signal that exceeded at least one signal quality threshold were received,

means for selecting from the transmission directions of the signal that exceeded the at least one signal quality threshold, a transmission direction or directions in which to continue to transmit the signal.

22. Abase station, comprising:

a receiver configured to receive information on transmission directions from which a signal that exceeds at least one signal quality threshold is received,

a controller configured to select from the transmission directions of the signal that exceeds the at least one signal quality threshold, a transmission direction or directions in which to continue to transmit the signal.