Passive device information
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first device ( 310 ) may receive multiple reference signals (RSs) from a second device ( 320 ) via a plurality of passive devices ( 410,420 ), where each RS of the multiple RSs is forwarded individually by one of the plurality of passive devices with a first set of reflection configurations (Slot 502 , Slot 504 ). The first device may receive an additional RS from the second device via the plurality of passive devices, where the additional RS is forwarded jointly by all of the plurality of passive devices with a second set of reflection configurations (Slot 506 ). The first device may determine information from the plurality of passive devices based on the multiple RSs and the additional RS, where the information is represented by a change between the first set of reflection configurations and the second set of reflection configurations. Numerous other aspects are described.
1 . A first device for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
determine a first channel estimation from a first reference signal (RS) received from a second device via a first passive device of a plurality of passive devices;
determine a second channel estimation from a second RS received from the second device via a second passive device of the plurality of passive devices:
determine a third channel estimation from a third RS received from the second device via both the first passive device and the second passive device; and
determine information respective to the first passive device and the second passive device, wherein the information respective to the first passive device is represented by a change between the first channel estimation and the third channel estimation and the information respective to the second passive device is represented by a change between the second channel estimation and the third channel estimation.
2 . The first device of claim 1 , wherein the one or more processors are configured to transmit an update message to at least one of the plurality of passive devices based on the information.
3 . The first device of claim 1 , wherein the one or more processors are configured to transmit a control signal to at least one passive device of the plurality of passive devices for operating the at least one passive device, and wherein the information is feedback for the control signal.
4 . The first device of claim 1 , wherein the one or more processors are configured to transmit the information to the second device.
5 . The first device of claim 1 , wherein the information includes a first portion corresponding to a change between a first reflection configuration and a second reflection configuration for the first passive device of the plurality of passive devices and a second portion corresponding to a change between a first reflection configuration and a second reflection configuration for the second passive device of the plurality of passive devices.
6 . The first device of claim 5 , wherein the change between the first reflection configuration and the second reflection configuration for the first passive device indicates an acknowledgement.
7 . The first device of claim 5 , wherein the change between the first reflection configuration and the second reflection configuration for the first passive device indicates a negative acknowledgement.
8 . The first device of claim 5 , wherein the one or more processors are configured to test hypotheses for candidate changes between the first reflection configuration and the second reflection configuration for the first passive device and for candidate changes between the first reflection configuration and the second reflection configuration for the second passive device.
9 . The first device of claim 8 , wherein the one or more processors are configured to use sphere decoding to limit a quantity of the hypotheses to be tested.
10 . The first device of claim 1 , wherein the one or more processors are configured to receive the first RS, the second RS, and the third RS based on a scheduling configuration.
11 . The first device of claim 10 , wherein the one or more processors are configured to transmit the scheduling configuration to one or more of the second device or the plurality of passive devices.
12 . A method of wireless communication performed by a first device, comprising:
determining a first channel estimation from a first reference signal (RS) received from a second device via a first passive device of a plurality of passive devices;
determining a second channel estimation from a second RS received from the second device via a second passive device of the plurality of passive devices;
determining a third channel estimation from a third RS received from the second device via both the first passive device and the second passive device; and
determining information respective to the first passive device and the second passive device, wherein the information respective to the first passive device is represented by a change between the first channel estimation and the third channel estimation and the information respective to the second passive device is represented by a change between the second channel estimation and the third channel estimation.
13 . The method of claim 12 , further comprising transmitting an update message to at least one of the plurality of passive devices based on the information.
14 . The method of claim 12 , further comprising transmitting a control signal to at least one passive device of the plurality of passive devices for operating the at least one passive device, and wherein the information is feedback for the control signal.
15 . The method of claim 12 , further comprising transmitting the information to the second device.
16 . The method of claim 12 , wherein the information includes a first portion corresponding to a change between a first reflection configuration and a second reflection configuration for the first passive device of the plurality of passive devices and a second portion corresponding to a change between a first reflection configuration and a second reflection configuration for the second passive device of the plurality of passive devices.
17 . The method of claim 16 , wherein the change between the first reflection configuration and the second reflection configuration for the first passive device indicates an acknowledgement.
18 . The method of claim 16 , wherein the change between the first reflection configuration and the second reflection configuration for the first passive device indicates a negative acknowledgement.
19 . The method of claim 16 , further comprising:
testing hypotheses for candidate changes between the first reflection configuration and the second reflection configuration for the first passive device and for candidate changes between the first reflection configuration and the second reflection configuration for the second passive device.
20 . The method of claim 19 , further comprising:
using sphere decoding to limit a quantity of the hypotheses to be tested.
21 . The method of claim 12 , wherein the receiving of the first RS, the second RS, and the third RS are based on a scheduling configuration.
22 . The method of claim 21 , further comprising transmitting the scheduling configuration to one or more of the second device or the plurality of passive devices.
23 . A first device for wireless communication, comprising:
means for determining a first channel estimation from a first reference signal (RS) received from a second device via a first passive device of a plurality of passive devices;
means for determining a second channel estimation from a second RS received from the second device via a second passive device of the plurality of passive devices;
means for determining a third channel estimation from a third RS received from the second device via both the first passive device and the second passive device; and
means for determining information respective to the first passive device and the second passive device, wherein the information respective to the first passive device is represented by a change between the first channel estimation and the third channel estimation and the information respective to the second passive device is represented by a change between the second channel estimation and the third channel estimation.
24 . The first device of claim 23 , comprising:
means for transmitting an update message to at least one of the plurality of passive devices based on the information.
25 . The first device of claim 23 , comprising:
means for transmitting a control signal to at least one passive device of the plurality of passive devices for operating the at least one passive device, and wherein the information is feedback for the control signal.
26 . The first device of claim 23 , wherein the information includes a first portion corresponding to a change between a first reflection configuration and a second reflection configuration for the first passive device of the plurality of passive devices and a second portion corresponding to a change between a first reflection configuration and a second reflection configuration for the second passive device of the plurality of passive devices.
27 . A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:
one or more instructions that, when executed by one or more processors of a first device, cause the first device to:
determine a first channel estimation from a first reference signal (RS) received from a second device via a first passive device of a plurality of passive devices;
determine a second channel estimation from a second RS received from the second device via a second passive device of the plurality of passive devices;
determine a third channel estimation from a third RS received from the second device via both the first passive device and the second passive device; and
determine information respective to the first passive device and the second passive device, wherein the information respective to the first passive device is represented by a change between the first channel estimation and the third channel estimation and the information respective to the second passive device is represented by a change between the second channel estimation and the third channel estimation.
28 . The non-transitory computer-readable medium of claim 27 , wherein the one or more instructions when executed by the one or more processors, cause the first device to:
transmit an update message to at least one of the plurality of passive devices based on the information.
29 . The non-transitory computer-readable medium of claim 27 , wherein the one or more instructions when executed by the one or more processors, cause the first device to:
transmit a control signal to at least one passive device of the plurality of passive devices for operating the at least one passive device, and wherein the information is feedback for the control signal.