Channel information estimation for communication networks with meta-surfaces
Mechanisms for performing a channel information estimation procedure. A method is performed by a network node. The network node serves a user equipment via a meta-surface over a radio propagation channel. The method includes performing the channel information estimation procedure. The channel information estimation procedure involves compensation for configurations used by the meta-surface. The compensation pertains to estimation of channel quality of the radio propagation channel between the user equipment and the network node via the meta-surface. The method includes performing a data transmission over the radio propagation channel. The data transmission is performed with transmission settings as determined by the channel information estimation procedure.
1 . A method for performing a channel information estimation procedure, the method being performed by a network node, the network node serving a user equipment via a meta-surface over a radio propagation channel, the method comprising:
performing the channel information estimation procedure, wherein the channel information estimation procedure involves compensation for configurations used by the meta-surface, and wherein the compensation pertains to estimation of channel quality of the radio propagation channel between the user equipment and the network node via the meta-surface, the compensation for the configurations used by the meta-surface comprises:
configuring the user equipment with a compensation indicator to be used by the user equipment during the channel information estimation procedure, the meta- surface being of a type from a set of types, and the compensation indicator indicating which type the meta-surface is; and
performing a data transmission over the radio propagation channel, the data transmission being performed with transmission settings as determined by the channel information estimation procedure.
2 . The method according to claim 1 , wherein the configurations comprise a first configuration and a second configuration, the method further comprising:
configuring the meta-surface with the first configuration, wherein the channel information estimation procedure is performed whilst the meta-surface is configured to use the first configuration; and
configuring the meta-surface with the second configuration, wherein the data transmission is performed whilst the meta-surface is configured to use the second configuration.
3 . The method according to claim 2 , wherein the compensation is based on a difference between the first configuration and the second configuration.
4 . The method according to claim 2 , wherein the compensation pertains to a difference, with respect to the first configuration and the second configuration, in signal pathloss between the network node and the user equipment or in signal power density received by the user equipment.
5 . The method according to claim 2 , wherein the first configuration yields a first angular coverage of the meta-surface, wherein the first configuration yields a second angular coverage of the meta-surface, and wherein the first angular coverage is wider than the second angular coverage.
6 . The method according to claim 1 , wherein the compensation indicator is an offset value to a channel quality information, CQI, value to be reported by the user equipment during the channel information estimation procedure.
7 . The method according to claim 6 , wherein the offset value is dependent on signal pathloss between the network node and the user equipment.
8 . The method according to claim 1 , wherein performing the channel information estimation procedure involves application of a compensation factor to a value of a CQI report received from the user equipment during the channel information estimation procedure, and wherein the transmission settings are a function of the value of the CQI report as compensated by the compensation factor.
9 . The method according to claim 1 , wherein the transmission settings are any of: Modulation and Coding Scheme, MCS, rank, Signal to Noise Ratio, SNR, offset, beamforming parameters, precoding parameters, directivity parameters.
10 . The method according to claim 1 , wherein the configurations pertain to settings of reflection angle or gain factor of the meta-surface.
11 . The method according to claim 1 , wherein the network node is serving at least two user equipment via the meta-surface, and wherein the compensation is determined individually per user equipment.
12 . A method for performing a channel information estimation procedure, the method being performed by a user equipment, the user equipment being served by a network node via a meta-surface over a radio propagation channel, the method comprising:
obtaining, as part of performing the channel information estimation procedure with the network node, a compensation indicator to be used by the user equipment during the channel information estimation procedure, wherein the channel information estimation procedure involves compensation, based on the compensation indicator, for configurations used by the meta-surface, and wherein the compensation pertains to estimation of channel quality of the radio propagation channel between the user equipment and the network node via the meta-surface, the compensation for the configurations used by the meta-surface comprises:
the meta-surface being of a type from a set of types, and the compensation indicator indicating which type the meta-surface is; and
receiving a data transmission from the network node via the meta-surface.
13 . The method according to claim 12 , wherein the compensation indicator is an offset value to a channel quality information, CQI, value to be reported by the user equipment during the channel information estimation procedure.
14 . The method according to claim 13 , the method further comprising:
obtaining the CQI value from channel measurements performed during the channel information estimation procedure; and
compensating the CQI value with the offset value before reporting the CQI value as compensated to the network node.
15 . The method according to claim 12 , the method further comprising: mapping the compensation indicator to an offset value; obtaining the CQI value from channel measurements performed during the channel information estimation procedure; and compensating the CQI value with the offset value before reporting the CQI value as compensated to the network node.
16 . A network node for performing a channel information estimation procedure, the network node being configured to serve a user equipment via a meta-surface over a radio propagation channel, the network node comprising processing circuitry, the processing circuitry being configured to cause the network node to:
perform the channel information estimation procedure, wherein the channel information estimation procedure involves compensation for configurations used by the meta-surface, and wherein the compensation pertains to estimation of channel quality of the radio propagation channel between the user equipment and the network node via the meta-surface, the compensation for the configurations used by the meta-surface comprises:
configuring the user equipment with a compensation indicator to be used by the user equipment during the channel information estimation procedure, the meta- surface being of a type from a set of types, and the compensation indicator indicating which type the meta-surface is; and
perform a data transmission over the radio propagation channel, the data transmission being performed with transmission settings as determined by the channel information estimation procedure.
17 . A user equipment for performing a channel information estimation procedure, the user equipment being configured to be served by a network node via a meta-surface over a radio propagation channel, the user equipment comprising processing circuitry, the processing circuitry being configured to cause the user equipment to:
obtain, as part of performing the channel information estimation procedure with the network node, a compensation indicator to be used by the user equipment during the channel information estimation procedure, wherein the channel information estimation procedure involves compensation, based on the compensation indicator, for configurations used by the meta-surface, and wherein the compensation pertains to estimation of channel quality of the radio propagation channel between the user equipment and the network node via the meta-surface, the compensation for the configurations used by the meta-surface comprises:
the meta-surface being of a type from a set of types, and the compensation indicator indicating which type the meta-surface is; and
receive a data transmission from the network node via the meta-surface.