Broadcasting intended time division duplex configurations
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a child node may receive a message, from a serving or neighboring cell, that includes an indication of an intended time division duplex (TDD) configuration for the serving or neighboring cell. The indication may include downlink and uplink indicators for at least one slot used within the intended TDD configuration. Accordingly, the child node may determine a symbol to use within a TDD configuration for the child node, based at least in part on receiving the message. Numerous other aspects are provided.
1. A child node for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to cause the child node to:
receive a message, from a serving or neighboring cell, that includes an indication of an intended time division duplex (TDD) configuration for the serving or neighboring cell, wherein the indication includes downlink and uplink indicators and indicators of availability of symbols for at least one slot used within the intended TDD configuration; and
determine a symbol to use within a TDD configuration for the child node, based at least in part on the indicators of availability of symbols in the message, wherein the child node is an integrated access and backhaul (TAB) node of an IAB network, and wherein the TDD configuration for the child node is different than the intended TDD configuration for the serving or neighboring cell.
2. The child node of claim 1 , wherein determining the symbol is based at least in part on managing interference between the TDD configuration for the child node and the intended TDD configuration for the serving or neighboring cell.
3. The child node of claim 1 , wherein the indication includes, for the at least one slot used within the intended TDD configuration, information indicating a quantity of downlink symbols and a quantity of uplink symbols.
4. The child node of claim 1 , wherein the indication includes, for the at least one slot used within the intended TDD configuration, an implicit indicator of a quantity of flexible symbols.
5. The child node of claim 1 , wherein the indication includes, for the at least one slot used within the intended TDD configuration, an indicator of a permutation of the downlink and uplink indicators.
6. The child node of claim 1 , wherein the message is included in a system information block (SIB).
7. The child node of claim 1 , wherein the message is included in downlink control information (DCI).
8. The child node of claim 7 , wherein the DCI is a group-common DCI sent to a set of wireless devices including the child node.
9. The child node of claim 8 , wherein the group-common DCI indicates a slot format indication (SFI) corresponding to the intended TDD configuration.
10. The child node of claim 1 , wherein the one or more processors are further configured to cause the child node to:
receive a paging message indicating a change to the intended TDD configuration; and
determine the symbol to use based at least in part on receiving the paging message.
11. The child node of claim 1 , wherein the one or more processors, to receive the message, are configured to cause the child node to:
receive the message from a distributed unit (DU) in the IAB network.
12. The child node of claim 1 , wherein the serving or neighboring cell comprises a serving cell of the child node, and wherein the intended TDD configuration comprises at least one of a cell-specific TDD configuration, a dedicated TDD configuration, a slot format indication (SFI), or a combination thereof.
13. The child node of claim 12 , wherein the one or more processors, to determine the symbol to use, are configured to cause the child node to:
determine the symbol to use based at least in part on the at least one of a cell-specific TDD configuration, a dedicated TDD configuration, an SFI, or a combination thereof.
14. A parent node for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to cause the parent node to:
generate a message to include an indication of an intended time division duplex (TDD) configuration for the parent node, wherein the indication includes downlink and uplink indicators and indicators of availability of symbols for at least one slot used within the intended TDD configuration; and
transmit, to another node, the message including the indication of the intended TDD configuration for the parent node, wherein the parent node is an integrated access and backhaul (IAB) node of an IAB network, and wherein a TDD configuration for the other node is different than the intended TDD configuration for the parent node.
15. The parent node of claim 14 , wherein the indication includes, for the at least one slot used within the intended TDD configuration, information indicating a quantity of downlink symbols and a quantity of uplink symbols.
16. The parent node of claim 14 , wherein the indication includes, for the at least one slot used within the intended TDD configuration, an implicit indicator of a quantity of flexible symbols.
17. The parent node of claim 14 , wherein the indication includes, for the at least one slot used within the intended TDD configuration, an indicator of a permutation of the downlink and uplink indicators.
18. The parent node of claim 14 , wherein the one or more processors, to transmit the message, are configured to cause the parent node to:
broadcast the message as a system information block (SIB) message.
19. The parent node of claim 18 , wherein the one or more processors, to broadcast the SIB message, are configured to cause the parent node to:
broadcast the SIB message on an on-demand basis.
20. The parent node of claim 14 , wherein the one or more processors, to transmit the message, are configured to cause the parent node to:
send the message as downlink control information (DCI).
21. The parent node of claim 20 , wherein the DCI is a group-common DCI sent to a set of wireless devices including the other node, and wherein the other node comprises a child node.
22. The parent node of claim 21 , wherein the group-common DCI indicates a slot format indication (SFI) corresponding to the intended TDD configuration.
23. The parent node of claim 20 , wherein the DCI is directed to one or more mobile termination (MT) nodes including the other node.
24. The parent node of claim 14 , wherein the one or more processors are further configured to cause the parent node to:
generate a paging message indicating a change to the intended TDD configuration; and
transmit the paging message indicating the change to the intended TDD configuration.
25. The parent node of claim 24 , wherein the one or more processors, to transmit the paging message, are configured to cause the parent node to:
broadcast the paging message on an on-demand basis or directed to one or more mobile termination (MT) nodes including the other node.
26. The parent node of claim 14 , wherein the parent node is at least part of a serving cell, and wherein the intended TDD configuration comprises at least one of a cell-specific TDD configuration, a dedicated TDD configuration, a slot format indication (SFI), or a combination thereof.
27. A method of wireless communication performed by a child node, comprising:
receiving a message, from a serving or neighboring cell, that includes an indication of an intended time division duplex (TDD) configuration for the serving or neighboring cell, wherein the indication includes downlink and uplink indicators and indicators of availability of symbols for at least one slot used within the intended TDD configuration; and
determining a symbol to use within a TDD configuration for the child node, based at least in part on the indicators of availability of symbols in the message, wherein the child node is an integrated access and backhaul (IAB) node of an IAB network, and wherein the TDD configuration for the child node is different than the intended TDD configuration for the serving or neighboring cell.
28. The method of claim 27 , wherein determining the symbol is based at least in part on managing interference between the TDD configuration for the child node and the intended TDD configuration for the serving or neighboring cell.
29. The method of claim 27 , wherein the indication includes, for the at least one slot used within the intended TDD configuration, information indicating a quantity of downlink symbols and a quantity of uplink symbols.
30. A method of wireless communication performed by a parent node, comprising:
generating a message to include an indication of an intended time division duplex (TDD) configuration for the parent node, wherein the indication includes downlink and uplink indicators and indicators of availability of symbols for at least one slot used within the intended TDD configuration; and
transmitting, to another node, the message including the indication of the intended TDD configuration for the parent node, wherein the parent node is an integrated access and backhaul (IAB) node of an IAB network, and wherein a TDD configuration for the other node is different than the intended TDD configuration for the parent node.