GROUP FREQUENCY HOPPING OF AMBIENT INTERNET OF THINGS (AIOT) DEVICES
Various aspects of the present disclosure relate to group frequency hopping for ambient Internet of Things (AIoT) devices. For example, a non-orthogonal multiple access mechanism for AIoT devices enabling a group of devices to simultaneously and non-orthogonally transmit different transport blocks (TBs) to a receiver device (a base station, UE, and so on). The group of UEs may perform group frequency hopping to transmit data blocks at different frequencies and time slots. A receiver device may then detect the transmissions (e.g., superimposed signals) using multi-user detection techniques.
1 . A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
transmit, simultaneously with a group of UEs that includes the UE, data blocks over an initial carrier frequency; and
perform group frequency hopping by transmitting, simultaneously with the group of UEs, data blocks over a shifted carrier frequency.
2 . The UE of claim 1 , wherein the at least one processor is configured to cause the UE to transmit the data over the initial carrier frequency at an initial time slot and perform the group frequency hopping at a next time slot after the initial time slot.
3 . The UE of claim 1 , wherein the shifted carrier frequency is shifted based on one or more carrier frequency shifts configured for the group of UEs.
4 . The UE of claim 1 , wherein the group of UEs includes passive ambient Internet of Things (AIoT) devices, semi-passive AIoT devices, or active AIoT devices.
5 . The UE of claim 1 , wherein the UE is an ambient internet of things (AIoT) device.
6 . The UE of claim 1 , wherein the data blocks transmitted over the initial carrier frequency are the same as the data blocks transmitted over the shifted carrier frequency.
7 . The UE of claim 1 , wherein the data blocks transmitted over the initial carrier frequency are different than the data blocks transmitted over the shifted carrier frequency.
8 . The UE of claim 1 , wherein the one or more carrier frequency shifts are selected to reduce transmission interference between the group of UEs and another group of UEs.
9 . The UE of claim 1 , wherein the UE is a passive ambient Internet of Things (AIoT) device or a semi-passive AIoT device, and wherein the at least one processor is further configured to cause the UE to:
receive a carrier wave from a reader device; and
transmit the data blocks over the initial carrier frequency and the shifted carrier frequency via backscatter transmissions responsive to the received carrier wave.
10 . The UE of claim 1 , wherein the data blocks comprise constellation points, including: quadrature amplitude modulation (QAM), quadrature phase shift keying (QPSK), or phase shift keying (PSK).
11 . The UE of claim 1 , wherein the data blocks are codewords drawn from codebooks configured for ambient Internet of Things (AIoT) devices.
12 . A processor for wireless communication, comprising:
at least one controller coupled with at least one memory and configured to cause the processor to:
transmit, simultaneously with a group of user equipment (UEs) that includes the processor, data blocks over an initial carrier frequency; and
perform group frequency hopping by transmitting, simultaneously with the group of UEs, data blocks over a shifted carrier frequency.
13 . A network entity for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the network entity to:
determine a configuration that identifies one or more carrier frequency shifts of carrier frequencies used by a group of user equipment (UEs) for simultaneous transmission of data blocks; and
transmit the determined configuration to the group of UEs.
14 . The network entity of claim 13 , wherein the at least one processor is further configured to cause the network entity to:
receive superposed transmissions from the group of UEs; and
detect and decode the received superposed transmissions via multi-user detection algorithms.
15 . The network entity of claim 14 , wherein the superposed transmissions include signatures for each UE of the group of UEs, and wherein the at least one processor is further configured to:
re-synchronize transmissions received from each UE of the group of UEs using the signatures.
16 . The network entity of claim 15 , wherein the at least one processor is further configured to cause the network entity to estimate timing errors between each UE of the group of UEs using the signatures for each UE.
17 . The network entity of claim 13 , wherein the at least one processor is further configured to cause the network entity to trigger the group of UEs to transmit the signatures for each UE to the network entity.
18 . The network entity of claim 13 , wherein the at least one processor is configured to cause the network entity to identify the group of UEs via a group identifier for the group of UEs.
19 . The network entity of claim 13 , wherein the network entity is a receiver device and the group of UEs includes passive ambient Internet of Things (AIoT) devices, semi-passive AIoT devices, or active AIoT devices.
20 . A method performed by a network entity, the method comprising:
determining a configuration that identifies one or more carrier frequency shifts of carrier frequencies used by a group of user equipment (UEs) for simultaneous transmission of data blocks; and
transmitting the determined configuration to the group of UEs.