Method for determining MIMO transmission techniques, base station and mobile terminal
First Claim
1. A method for determining an appropriate combination of at least two MIMO transmission techniques for a radio downlink from a base station to a mobile station, the method comprising:
- using at least two antennas with at least two polarizations, wherein said appropriate combination is a combination of beamforming and at least one of polarization-time-coding, polarization-frequency-coding, closed-loop coherent combination of polarization beams and polarization multiplexing, and said appropriate combination is chosen dependent on radio conditions of the radio downlink and relative velocity in between the base station and the mobile station;
wherein the appropriate combination includes;
a combination of beamforming with polarization time coding when signal to noise plus interference ratio (SINR) is below an SINR threshold and a receiver is moving at a speed above a chosen threshold;
a combination of beamforming and a closed loop transmit diversity technique when the SINR is below the SINR threshold and receiver velocity is below the chosen threshold; and
a combination of beamforming and spatial multiplexing when the SINR is above the SINR threshold, without regard to receiver velocity.
4 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to a method for determining the appropriate combination of at least two MIMO transmission techniques for a radio link in between a transmitter (10) and a receiver (20). The MIMO transmission techniques use at least two antennas (12, 14, 16, 18) with at least two polarizations. According to the invention the appropriate combination is the combination of beamforming and at least one of polarization time coding, closed loop coherent combination of polarization beams and polarization multiplexing. The appropriate combination is chosen dependent on at least one of radio conditions of the radio link (20) and relative velocity in between the transmitter (10) and the receiver (30). The invention further relates to a method for receiving a transmission of a radio link (20) in between a transmitter (10) and a receiver (30). The invention also relates to a base station comprising a transmitter, a mobile terminal comprising a receiver and a communication network.
7 Citations
15 Claims
-
1. A method for determining an appropriate combination of at least two MIMO transmission techniques for a radio downlink from a base station to a mobile station, the method comprising:
- using at least two antennas with at least two polarizations, wherein said appropriate combination is a combination of beamforming and at least one of polarization-time-coding, polarization-frequency-coding, closed-loop coherent combination of polarization beams and polarization multiplexing, and said appropriate combination is chosen dependent on radio conditions of the radio downlink and relative velocity in between the base station and the mobile station;
wherein the appropriate combination includes; a combination of beamforming with polarization time coding when signal to noise plus interference ratio (SINR) is below an SINR threshold and a receiver is moving at a speed above a chosen threshold; a combination of beamforming and a closed loop transmit diversity technique when the SINR is below the SINR threshold and receiver velocity is below the chosen threshold; and a combination of beamforming and spatial multiplexing when the SINR is above the SINR threshold, without regard to receiver velocity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 14, 15)
- using at least two antennas with at least two polarizations, wherein said appropriate combination is a combination of beamforming and at least one of polarization-time-coding, polarization-frequency-coding, closed-loop coherent combination of polarization beams and polarization multiplexing, and said appropriate combination is chosen dependent on radio conditions of the radio downlink and relative velocity in between the base station and the mobile station;
-
9. A method for receiving a transmission over a radio downlink from a base station to a mobile station, the method comprising:
- the transmission being performed according to an appropriate combination of at least two MIMO transmission techniques, using at least two antennas with at least two polarizations, said appropriate combination is chosen dependent on radio conditions of the radio downlink and relative velocity between the base station and the mobile station;
wherein the appropriate combination includes; a combination of beamforming with polarization time coding when signal to noise plus interference ratio (SINR) is below an SINR threshold and a receiver is moving at a speed above a chosen threshold; a combination of beamforming and a closed loop transmit diversity technique when the SINR is below the SINR threshold and receiver velocity is below the chosen threshold; and a combination of beamforming and spatial multiplexing when the SINR is above the SINR threshold, without regard to receiver velocity. - View Dependent Claims (10, 11, 12, 13)
- the transmission being performed according to an appropriate combination of at least two MIMO transmission techniques, using at least two antennas with at least two polarizations, said appropriate combination is chosen dependent on radio conditions of the radio downlink and relative velocity between the base station and the mobile station;
Specification