Techniques for determining resources for repetitions in wireless communications
Aspects described herein relate to determining symbols over which to transmit repetitions for certain types of communications. A resource grant can include information for transmitting a number of repetitions over a collection of resources, such as a starting symbol over which to transmit communications, a number of symbols over which to transmit communications, and/or a nominal number of repetitions to transmit. Where time division multiplexing (TDM) communications are configured, a slot format indicator (SFI) can be semi-statically or dynamically configured and can indicate a communication direction of symbols within one or more slots as being uplink, downlink, or flexible. Thus, mapping uplink communications to the symbols may be based on additional considerations.
1. A method for wireless communication, comprising:
receiving a semi-static configuration indicating a communication direction for each of a plurality of symbols in a slot as being uplink, downlink, or flexible, wherein the semi-static configuration indicates the communication direction for at least a first symbol of the plurality of symbols in the slot as being uplink, the communication direction for at least a second symbol of the plurality of symbols in the slot as being downlink, and the communication direction for at least a third symbol of the plurality of symbols in the slot as being flexible;
receiving a resource grant for transmitting over an uplink shared channel in at least two symbols of the plurality of symbols in the slot, wherein the resource grant indicates an index of a starting symbol for transmitting an uplink communication, a number of the at least two symbols for transmitting the uplink communication, and a nominal number of repetitions for transmitting the uplink communication, and wherein the resource grant includes a single bit indicator indicating that multiple symbols in the slot indicated by the semi-static configuration as flexible are not to be used for uplink communications; and
transmitting, based at least in part on the semi-static configuration and the single bit indicator, one or more repetitions of the uplink communication starting at the starting symbol, continuing over the number of the at least two symbols that do not include the multiple symbols indicated in the semi-static configuration as flexible, and based on the nominal number of repetitions.
2. The method of claim 1 , wherein the semi-static configuration is received in radio resource control (RRC) signaling.
3. The method of claim 1 , wherein the single bit indicator indicates that the multiple symbols indicated by the semi-static configuration as flexible are not to be used for uplink communications excluding a number of transition symbols used for at least one of transitioning from downlink to uplink or applying a timing advance.
4. The method of claim 3 , further comprising receiving, in radio resource control (RRC) signaling, an indication of the number of transition symbols.
5. The method of claim 3 , further comprising determining the number of transition symbols based on a downlink subcarrier spacing.
6. The method of claim 1 , wherein the single bit indicator indicates that the multiple symbols indicated by the semi-static configuration as flexible are not to be used for uplink communications excluding a number of synchronization symbols indicated for reception of synchronization signal blocks.
7. The method of claim 1 , wherein the single bit indicator indicates that the multiple symbols indicated by the semi-static configuration as flexible are not to be used for uplink communications excluding a number of control symbols indicated for reception of a control resource set.
8. The method of claim 1 , wherein transmitting the one or more repetitions includes segmenting transmission over a number of transition symbols used for at least one of transitioning from downlink to uplink or applying a timing advance.
9. The method of claim 8 , further comprising receiving, in radio resource control (RRC) signaling, an indication of the number of transition symbols.
10. The method of claim 8 , further comprising determining the number of transition symbols based on a downlink subcarrier spacing.
11. The method of claim 1 , wherein transmitting the one or more repetitions includes segmenting transmission over a number of synchronization symbols indicated for reception of synchronization signal blocks.
12. The method of claim 1 , wherein transmitting the one or more repetitions includes segmenting transmission over a number of control symbols indicated for reception of a control resource set.
13. A method for wireless communication, comprising:
transmitting a semi-static configuration indicating a communication direction for each of a plurality of symbols in a slot as being uplink, downlink, or flexible, wherein the semi-static configuration indicates the communication direction for at least a first symbol of the plurality of symbols in the slot as being uplink, the communication direction for at least a second symbol of the plurality of symbols in the slot as being downlink, and the communication direction for at least a third symbol of the plurality of symbols in the slot as being flexible;
transmitting a resource grant for an uplink shared channel in at least two symbols of the plurality of symbols in the slot, wherein the resource grant indicates an index of a starting symbol for transmitting an uplink communication, a number of the at least two symbols for transmitting the uplink communication, a nominal number of repetitions for transmitting the uplink communication, and a single bit indicator indicating that multiple symbols in the slot indicated by the semi-static configuration as flexible are not to be used for uplink communications; and
receiving, based at least in part on the semi-static configuration and the single bit indicator, one or more repetitions of the uplink communication starting at the starting symbol, continuing over the number of the at least two symbols that do not include the multiple symbols indicated in the semi-static configuration as flexible, and based on the nominal number of repetitions.
14. The method of claim 13 , wherein the semi-static configuration is transmitted in radio resource control (RRC) signaling.
15. The method of claim 13 , wherein the single bit indicator indicates that the multiple symbols indicated by the semi-static configuration as flexible are not to be used for uplink communications excluding a number of transition symbols used for at least one of transitioning from downlink to uplink or applying a timing advance.
16. The method of claim 15 , further comprising transmitting, in radio resource control (RRC) signaling, an indication of the number of transition symbols.
17. The method of claim 13 , wherein the single bit indicator indicates that the multiple symbols indicated by the semi-static configuration as flexible are not to be used for uplink communications excluding at least one of a number of synchronization symbols indicated for reception of synchronization signal blocks that are indicated by the semi-static configuration as flexible, or a number of control symbols indicated for reception of a control resource set that are indicated by the semi-static configuration as flexible.
18. The method of claim 13 , wherein receiving the one or more repetitions is based on skipping decoding over a number of transition symbols used for at least one of transitioning from downlink to uplink or applying a timing advance.
19. The method of claim 18 , further comprising transmitting, in radio resource control (RRC) signaling, an indication of the number of transition symbols.
20. The method of claim 13 , wherein receiving the one or more repetitions is based on skipping decoding over at least one of a number of synchronization symbols indicated for reception of synchronization signal blocks, or a number of control symbols indicated for reception of a control resource set.
21. An apparatus for wireless communication, comprising:
a transceiver;
a memory configured to store instructions; and
one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to:
receive a semi-static configuration indicating a communication direction for each of a plurality of symbols in a slot as being uplink, downlink, or flexible, wherein the semi-static configuration indicates the communication direction for at least a first symbol of the plurality of symbols in the slot as being uplink, the communication direction for at least a second symbol of the plurality of symbols in the slot as being downlink, and the communication direction for at least a third symbol of the plurality of symbols in the slot as being flexible;
receive a resource grant for transmitting over an uplink shared channel in at least two symbols of the plurality of symbols in the slot, wherein the resource grant indicates an index of a starting symbol for transmitting an uplink communication, a number of the at least two symbols for transmitting the uplink communication, and a nominal number of repetitions for transmitting the uplink communication, and wherein the resource grant includes a single bit indicator indicating that multiple symbols in the slot indicated by the semi-static configuration as flexible are not to be used for uplink communications; and
transmit, based at least in part on the semi-static configuration and the single bit indicator, one or more repetitions of the uplink communication starting at the starting symbol, continuing over the number of the at least two symbols that do not include the multiple symbols indicated in the semi-static configuration as flexible, and based on the nominal number of repetitions.
22. The apparatus of claim 21 , wherein the single bit indicator indicates that the multiple symbols indicated by the semi-static configuration as flexible are not to be used for uplink communications excluding at least one of a number of transition symbols used for at least one of transitioning from downlink to uplink or applying a timing advance, a number of synchronization symbols used to indicate reception of synchronization signal blocks, or a number of control symbols used to indicate reception of a control resource set.
23. The apparatus of claim 22 , wherein the one or more processors are further configured to receive, in radio resource control (RRC) signaling, an indication of the number of transition symbols.
24. The apparatus of claim 22 , wherein the one or more processors are further configured to determine the number of transition symbols based on a downlink subcarrier spacing.
25. The apparatus of claim 21 , wherein the one or more processors are configured to transmit the one or more repetitions at least in part by segmenting transmission over at least one of a number of transition symbols used for at least one of transitioning from downlink to uplink or applying a timing advance, a number of synchronization symbols indicated for reception of synchronization signal blocks, or a number of control symbols indicated for reception of a control resource set.
26. The apparatus of claim 21 , wherein the semi-static configuration is received in radio resource control (RRC) signaling.
27. The apparatus of claim 21 , wherein the one or more processors are configured to transmit the one or more repetitions at least in part by segmenting transmission over a number of transition symbols used for at least one of transitioning from downlink to uplink or applying a timing advance.
28. The apparatus of claim 27 , wherein the one or more processors are further configured to receive, in radio resource control (RRC) signaling, an indication of the number of transition symbols.
29. An apparatus for wireless communication, comprising:
a transceiver;
a memory configured to store instructions; and
one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to:
transmit a semi-static configuration indicating a communication direction for each of a plurality of symbols in a slot as being uplink, downlink, or flexible, wherein the semi-static configuration indicates the communication direction for at least a first symbol of the plurality of symbols in the slot as being uplink, the communication direction for at least a second symbol of the plurality of symbols in the slot as being downlink, and the communication direction for at least a third symbol of the plurality of symbols in the slot as being flexible;
transmit a resource grant for an uplink shared channel in at least two symbols of the plurality of symbols in the slot, wherein the resource grant indicates an index of a starting symbol for transmitting an uplink communication, a number of the at least two symbols for transmitting the uplink communication, a nominal number of repetitions for transmitting the uplink communication, and a single bit indicator indicating that multiple symbols in the slot indicated by the semi-static configuration as flexible are not to be used for uplink communications; and
receive, based at least in part on the semi-static configuration and the single bit indicator, one or more repetitions of the uplink communication starting at the starting symbol, continuing over the number of the at least two symbols that do not include the multiple symbols indicated in the semi-static configuration as flexible, and based on the nominal number of repetitions.
30. The apparatus of claim 29 , wherein the single bit indicator indicates that the multiple symbols indicated by the semi-static configuration as flexible are not to be used for uplink communications excluding at least one of a number of transition symbols used for at least one of transitioning from downlink to uplink or applying a timing advance, a number of synchronization symbols used to indicate reception of synchronization signal blocks, or a number of control symbols used to indicate reception of a control resource set.