Frame structure for synchronous operation of an ambient internet-of-things device
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, an ambient Internet-of-Things (IoT) device may receive configuration information indicating resources associated with an uplink trigger message that initiates a communication session between the ambient IoT device and a network device. The ambient IoT device may transmit the uplink trigger message to the network device using the resources associated with the uplink trigger message. Numerous other aspects are described.
1 . A method of wireless communication performed by an ambient Internet-of-Things (IoT) device, comprising:
receiving configuration information indicating resources associated with an uplink trigger message that initiates a communication session between the ambient IoT device and a network device, wherein the resources associated with the uplink trigger message are associated with a frame structure that includes:
a first slot associated with resources associated with a physical broadcast channel (PBCH);
a second slot after the first slot, the second slot associated with resources associated with a primary synchronization signal (PSS); and
a third slot after the second slot, the third slot associated with the resources associated with the uplink trigger message; and
transmitting the uplink trigger message to the network device using the resources associated with the uplink trigger message.
2 . The method of claim 1 , further comprising acquiring the PSS from the network device, wherein receiving the configuration information indicating the resources associated with the uplink trigger message is based at least in part on timing information indicated by the PSS.
3 . The method of claim 1 , wherein the resources associated with the uplink trigger message occur at a fixed relative location with respect to resources associated with a primary synchronization signal.
4 . The method of claim 1 , wherein the uplink trigger message is transmitted by backscattering a continuous wave transmitted by the network device.
5 . The method of claim 1 , wherein the frame structure further includes resources associated with at least one of:
a primary synchronization signal (PSS),
a secondary synchronization signal (SSS),
a physical broadcast channel (PBCH),
a physical downlink control channel (PDCCH),
a physical downlink shared channel (PDSCH),
a physical uplink control channel (PUCCH), or
a physical uplink shared channel (PUSCH).
6 . The method of claim 5 , wherein the frame structure further includes:
a fourth slot associated with resources associated with the SSS.
7 . The method of claim 6 , wherein the frame structure further includes:
a first set of one or more slots associated with resources associated with at least one of the PDCCH or the PDSCH, and
a second set of one or more slots associated with resources associated with at least one of the PUCCH or the PUSCH.
8 . The method of claim 7 , further comprising receiving a slot format indicator that indicates a location of the first set of one or more slots and the second set of one or more slots within the frame structure.
9 . The method of claim 5 , wherein the frame structure includes a plurality of slots, and wherein a duration of each slot, of the plurality of slots, is equal to a product of an integer and one millisecond.
10 . The method of claim 9 , wherein the integer is greater than one.
11 . The method of claim 5 , wherein the frame structure is associated with a plurality of symbols, wherein a duration of each symbol, of the plurality of symbols, is equal to one millisecond divided by a product of a subcarrier spacing used for transmission and an integer, and wherein the integer is greater than one.
12 . The method of claim 5 , wherein the frame structure is associated with a plurality of slots and a plurality of symbols, wherein a duration of each slot, of the plurality of slots, is equal to a product of first integer greater than one and one millisecond, and wherein a duration of each symbol, of the plurality of symbols, is equal to one millisecond divided by a product of a subcarrier spacing used for transmission and a second integer greater than one.
13 . The method of claim 5 , wherein the frame structure includes a guard interval between symbol transmissions associated with the frame structure.
14 . The method of claim 1 , further comprising receiving a downlink communication from the network device, wherein the downlink communication is encoded using a self-clocking encoding scheme.
15 . The method of claim 14 , wherein the downlink communication is encoded using a Manchester encoding scheme, and wherein the uplink trigger message is encoded using one of a Miller encoding scheme or an FM0 encoding scheme.
16 . A method of wireless communication performed by a network device, comprising:
transmitting, to an ambient Internet-of-Things (IoT) device, configuration information indicating resources associated with an uplink trigger message that initiates a communication session between the ambient IoT device and the network device, wherein the resources associated with the uplink trigger message are associated with a frame structure that includes:
a first slot associated with resources associated with a physical broadcast channel (PBCH);
a second slot after the first slot, the second slot associated with resources associated with a primary synchronization signal (PSS); and
a third slot after the second slot, the third slot associated with the resources associated with the uplink trigger message; and
receiving, from the ambient IoT device, the uplink trigger message using the resources associated with the uplink trigger message.
17 . The method of claim 16 , further comprising transmitting, to the ambient IoT device, the PSS, wherein transmitting the configuration information indicating the resources associated with the uplink trigger message is based at least in part on timing information indicated by the PSS.
18 . The method of claim 16 , wherein the resources associated with the uplink trigger message occur at a fixed relative location with respect to resources associated with a primary synchronization signal.
19 . The method of claim 16 , further comprising transmitting a continuous wave to the ambient IoT device, wherein the uplink trigger message is received via a backscattered communication associated with the continuous wave.
20 . The method of claim 16 , wherein the frame structure further includes resources associated with at least one of:
a secondary synchronization signal (SSS),
a physical downlink control channel (PDCCH),
a physical downlink shared channel (PDSCH),
a physical uplink control channel (PUCCH), or
a physical uplink shared channel (PUSCH).
21 . The method of claim 20 , wherein the frame structure includes a plurality of slots, and wherein a duration of each slot, of the plurality of slots, is equal to a product of an integer and one millisecond.
22 . The method of claim 21 , wherein the integer is greater than one.
23 . The method of claim 20 , wherein the frame structure is associated with a plurality of symbols, wherein a duration of each symbol, of the plurality of symbols, is equal to one millisecond divided by a product of a subcarrier spacing used for transmission and an integer, and wherein the integer is greater than one.
24 . The method of claim 20 , wherein the frame structure is associated with a plurality of slots and a plurality of symbols, wherein a duration of each slot, of the plurality of slots, is equal to a product of first integer greater than one and one millisecond, and wherein a duration of each symbol, of the plurality of symbols, is equal to one millisecond divided by a product of a subcarrier spacing used for transmission and a second integer greater than one.
25 . The method of claim 20 , wherein the frame structure includes a guard interval between symbol transmissions.
26 . An ambient Internet-of-Things (IoT) device for wireless communication, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more memories storing instructions configurable to be executed by the one or more processors to cause the ambient IoT device to:
receive configuration information indicating resources associated with an uplink trigger message that initiates a communication session between the ambient IoT device and a network device, wherein the resources associated with the uplink trigger message are associated with a frame structure that includes:
a first slot associated with resources associated with a physical broadcast channel (PBCH);
a second slot after the first slot, the second slot associated with resources associated with a primary synchronization signal (PSS); and
a third slot after the second slot, the third slot associated with the resources associated with the uplink trigger message; and
transmit the uplink trigger message to the network device using the resources associated with the uplink trigger message.
27 . The ambient IoT device of claim 26 , wherein the one or more memories further store instructions configurable to be executed by the one or more processors to cause the ambient IoT device to acquire the PSS from the network device, wherein receiving the configuration information indicating the resources associated with the uplink trigger message is based at least in part on timing information indicated by the PSS.
28 . The ambient IoT device of claim 26 , wherein the resources associated with the uplink trigger message occur at a fixed relative location with respect to resources associated with a primary synchronization signal.
29 . A network device for wireless communication, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more memories storing instructions configurable to be executed by the one or more processors to cause the network device to:
transmit, to an ambient Internet-of-Things (IoT) device, configuration information indicating resources associated with an uplink trigger message that initiates a communication session between the ambient IoT device and the network device, wherein the resources associated with the uplink trigger message are associated with a frame structure that includes:
a first slot associated with resources associated with a physical broadcast channel (PBCH);
a second slot after the first slot, the second slot associated with resources associated with a primary synchronization signal (PSS); and
a third slot after the second slot, the third slot associated with the resources associated with the uplink trigger message; and
receive, from the ambient IoT device, the uplink trigger message using the resources associated with the uplink trigger message.
30 . The network device of claim 29 , wherein the one or more memories further store instructions configurable to be executed by the one or more processors to cause the network device to transmit, to the ambient IoT device, the PSS, wherein transmitting the configuration information indicating the resources associated with the uplink trigger message is based at least in part on timing information indicated by the PSS.