Device and method for controlling antenna elements of an antenna array
The disclosure relates to a device for controlling a plurality of antenna elements of an antenna array of a multi-input multi-output (MIMO) communication system, the device comprising: a communication handler configured to receive channel information from a first user equipment of a plurality of user equipments, the channel information indicating a communication channel quality of the first user equipment, and configured to receive quality of service (QoS) information indicating a QoS requirement for the first user equipment; and a controller configured to generate a plurality of weights for beamforming the plurality of antenna elements based on the channel information and based on the QoS information.
1. A device for controlling a plurality of antenna elements of an antenna array of a multi-input multi-output (MIMO) communication system, the device comprising:
communication handler processing circuitry configured to receive channel information from a first user equipment of a plurality of user equipments, the channel information indicating a communication channel quality of the first user equipment, and configured to wirelessly receive, via the MIMO communication system, quality of service (QoS) information indicating a QoS requirement for the first user equipment; and
a micro-controller configured to generate a precoder matrix based on cross layer beamforming that utilizes a channel matrix of the first user equipment and a scaling factor of the QoS requirement for the first user equipment, the precoder matrix comprising a plurality of weights for beamforming the plurality of antenna elements, the plurality of weights being generated based on a combination of the channel information and the QoS information.
2. The device of claim 1 , wherein the communication handler processing circuitry is configured to receive the QoS information by acquiring one of a Media Access Control (MAC) layer or a core network layer of the MIMO communication system.
3. The device of claim 1 , wherein the communication handler processing circuitry is configured to receive the QoS information from a radio bearer of the MIMO communication system assigned to the first user equipment.
4. The device of claim 3 , wherein the communication handler processing circuitry is configured to receive the QoS information from one of a data radio bearer or a signal radio bearer.
5. The device of claim 3 , wherein the communication handler processing circuitry is configured to receive the QoS information from a QoS Class Identifier (QCI) comprised in the radio bearer.
6. The device of claim 1 , wherein the communication handler processing circuitry is configured to receive the channel information from a physical layer of the MIMO communication system assigned to the first user equipment.
7. The device of claim 1 , wherein the communication handler processing circuitry is configured to receive the channel information by evaluating a Sounding Reference Signal (SRS) of the first user equipment.
8. The device of claim 1 , wherein the micro-controller is configured to generate the precoder matrix depending on a number of antenna elements and a number of antenna ports of the antenna array.
9. The device of claim 1 , wherein the cross layer beamforming includes Eigen Based Beamforming (EBB).
10. The device of claim 1 , wherein the micro-controller is configured to generate the precoder matrix based on the relation:
USV
=
1
N
k
N
u
∑
u
=
1
N
u
∑
j
=
1
N
k
f
u
(
H
u
,
j
)
H
H
u
,
j
where H u,j denotes the normalized frequency domain channel for the first user equipment u at subcarrier j, obtained by Sounding Reference Signal (SRS), N k denotes the total SRS subcarrier number for the first user equipment, N u denotes the number of user equipments served by the antenna array and f u denotes the scaling factor of the QoS requirement for the first user equipment.
11. The device of claim 10 , wherein the micro-controller is configured to generate the precoder matrix based on a singular value decomposition of the term USV.
12. The device of claim 10 , wherein the micro-controller is configured to generate the precoder matrix based on the first N p columns of an Eigen matrix V H , where N p is the number of antenna ports of the antenna array.
13. The device of claim 1 , wherein the micro-controller is configured to generate the scaling factor of the QoS requirement for the first user equipment based on a QoS Class Identifier (QCI) table.
14. The device of claim 1 , wherein the micro-controller is configured to generate the scaling factor of the QoS requirement for the first user equipment based on at least one of a QoS Class Identifier (QCI) table and a total number of radio bearers assigned to the first user equipment.
15. The device of claim 1 , wherein the micro-controller is configured to generate the scaling factor of the QoS requirement for the first user equipment based on at least one of a Packet Error Lost Rate (PELR) and a Packet Delay Budget (PDB) of the first user equipment.
16. The device of claim 1 , wherein the micro-controller is configured to generate the scaling factor of the QoS requirement for the first user equipment based on an outer-loop scaling adjustment factor.
17. The device of claim 16 , wherein the outer-loop scaling adjustment factor depends on at least one of a downlink channel quality index (CQI) and a block error rate (BLER).
18. The device of claim 1 , wherein the cross layer beamforming includes acquiring the channel information and the QoS information from different respective network layers.
19. A device for controlling a plurality of antenna elements of an antenna array of a full-dimensional multi-input multi-output (FD-MIMO) communication system, the device comprising:
communication handler processing circuitry configured to receive channel information from at least two User Equipments (UEs), the channel information indicating a communication channel quality of the at least two UEs and configured to wirelessly receive, via the FD-MIMO communication system, quality of service (QoS) information indicating a QoS requirement for the at least two UEs; and
micro-controller configured to generate a precoder matrix based on cross layer beamforming that utilizes a channel matrix of the at least two UEs and a scaling factor of the QoS requirement for the at least two UEs, the precoder matrix comprising a plurality of weights for beamforming the plurality of antenna elements, the plurality of weights being generated based on a combination of the channel information and the QoS information.
20. The device of claim 19 , wherein the micro-controller is configured to generate the plurality of weights for beamforming antenna elements of a two-dimensional antenna array structure which are placed in a vertical and a horizontal direction.
21. The device of claim 19 , wherein the cross layer beamforming includes Eigen Based Beamforming (EBB).
22. A method for controlling a plurality of antenna elements of an antenna array of a multi-input multi-output (MIMO) communication system, the method comprising:
receiving channel information from a plurality of user equipments (UEs), the channel information indicating communication channel qualities of the plurality of UEs;
wirelessly receiving, via the MIMO communication system, quality of service (QoS) information indicating QoS requirements for the plurality of UEs; and
generating a precoder matrix based on cross layer beamforming that utilizes a channel matrix of the plurality of UEs and a scaling factor of the QoS requirement for the plurality of UEs, the precoder matrix comprising a plurality of weights for beamforming the plurality of antenna elements, the plurality of weights being generated based on a combination of the channel information and the QoS information.
23. The method of claim 22 , comprising:
receiving the channel information for active UEs of the plurality of UEs from a physical layer of the MIMO communication system.
24. The method of claim 22 , comprising:
receiving the QoS information for active radio bearers assigned to the plurality of UEs from a communication layer of the MIMO communication system which is higher than a physical layer.