Delayed reconfiguration in wireless systems
Methods, systems, and devices for wireless communications are described that support delaying the application of reconfiguration messages. An integrated access and backhaul (IAB) node transmit or receive, along a first signaling path, a reconfiguration message indicating the first IAB node to postpone applying a reconfiguration message until a second signaling path becomes available. The first IAB node may send a reconfiguration complete message to a first IAB donor node along the first path and wait to perform a procedure with the first IAB donor node. When the second path becomes available, the first IAB node and the second IAB node may then perform the procedure. In some cases, delaying the reconfiguration may involve postponing the forwarding of messages received at the first IAB node.
1. A first node for wireless communication, comprising:
a memory; and
a processor coupled to the memory, wherein the processor is configured to cause the first node to:
receive, from a second node and via a first signaling path between the first node and a first donor node, a reconfiguration message that indicates a reconfiguration of the first node for a second signaling path via a third node, wherein the reconfiguration message comprises an indication to delay application of a portion of the reconfiguration message, wherein the reconfiguration message indicates updated uplink mapping information or Internet Protocol address information for the first node for communications via the second signaling path;
utilize, before communication via the second signaling path, initial uplink mapping information or Internet Protocol address information different from the updated uplink mapping information or Internet Protocol address information for the first node for communications via the first signaling path; and
communicate via the second signaling path in accordance with the reconfiguration message based at least in part on a trigger for reconfiguration of the first node for the second signaling path via the third node.
2. The first node of claim 1 , wherein the processor is configured to cause the first node to:
delay application of the portion of the reconfiguration message based at least in part on the second signaling path being unavailable and the indication to delay application of the portion of the reconfiguration message;
determine that the second signaling path is available; and
apply the portion of the reconfiguration message based at least in part on the determination.
3. The first node of claim 1 , wherein the processor is configured to cause the first node to:
establish a connection with the first donor node via the second node.
4. The first node of claim 3 , wherein the processor is configured to cause the first node to:
establish a second connection with one of the first donor node or a second donor node as part of the reconfiguration of the first node; and
determine that the second signaling path is available based at least in part on the establishment of the second connection.
5. The first node of claim 1 , wherein the indication to delay application of the portion of the reconfiguration message comprises:
an indication to postpone one or more procedures triggered by the reconfiguration message.
6. The first node of claim 1 , wherein, to utilize the initial uplink mapping information or Internet Protocol address information different from the updated uplink mapping information or Internet Protocol address information for the first node for communications via the first signaling path, the processor is configured to cause the first node to:
transmit a reconfiguration complete message to the first donor node via the first signaling path in accordance with the initial uplink mapping information or Internet Protocol address information.
7. The first node of claim 1 , wherein the processor is configured to cause the first node to:
transmit an acknowledgement of the reconfiguration message via the second signaling path in accordance with the updated uplink mapping information or Internet Protocol address information as part of communication via the second signaling path.
8. The first node of claim 1 , wherein the processor is configured to cause the first node to:
initiate a security handshake via the second signaling path in accordance with the updated uplink mapping information or Internet Protocol address information as part of communication via the second signaling path.
9. The first node of claim 1 , wherein the trigger for reconfiguration of the first node for the second signaling path via the third node comprises an expiration of a timer, an absolute time, reception of a first indication from the first donor node, reception of a second indication from a parent node of the first node, or any combination thereof.
10. The first node of claim 1 , wherein the indication to delay application of the portion of the reconfiguration message comprises:
an indication to postpone forwarding of an upstream message to the third node, wherein the upstream message is from a child node of the first node.
11. The first node of claim 1 , wherein the processor is configured to cause the first node to:
perform a random access procedure, a security handshake, or a handover procedure from the second node to the third node.
12. The first node of claim 1 , wherein the processor is configured to cause the first node to:
configure, based at least in part on the reconfiguration message, a new or existing stream control transmission protocol (SCTP) connection, a new or existing F1 control plane (F1-C) connection, an additional signaling path of an existing SCTP connection, or one or more new or existing F1 user plane (F1-U) data tunnels for the first node.
13. The first node of claim 1 , wherein the processor is configured to cause the first node to:
discard one or more portions of the reconfiguration message based at least in part on a failure of establishment of the second signaling path.
14. The first node of claim 13 , wherein the processor is configured to cause the first node to:
determine the failure of establishment of the second signaling path based at least in part on an indication from the first donor node, a parent node of the first node, or a lack of receipt of a configuration message from the parent node prior to expiration of a timer.
15. The first node of claim 1 , wherein the second signaling path is between the first node and the first donor node or between the first node and a second donor node.
16. A first node for wireless communication, comprising:
a memory; and
a processor coupled to the memory, wherein the processor is configured to cause the first node to:
receive, from a second node and via a first signaling path between the first node and a first donor node, a reconfiguration message that indicates a reconfiguration of the first node for a second signaling path, wherein the reconfiguration message indicates updated uplink mapping information or Internet Protocol address information for the first node for communications via the second signaling path;
utilize, before communication via the second signaling path, initial uplink mapping information or Internet Protocol address information different from the updated uplink mapping information or Internet Protocol address information for the first node for communications via the first signaling path; and
communicate via the second signaling path in accordance with the reconfiguration message.
17. The first node of claim 16 , wherein at least one of:
to utilize the initial uplink mapping information or Internet Protocol address information different from the updated uplink mapping information or Internet Protocol address information for the first node for communications via the first signaling path, the processor is configured to cause the first node to transmit a reconfiguration complete message to the first donor node via the first signaling path in accordance with the initial uplink mapping information or Internet Protocol address information;
the processor is configured to cause the first node to transmit an acknowledgement of the reconfiguration message via the second signaling path in accordance with the updated uplink mapping information or Internet Protocol address information as part of communication via the second signaling path; or
the processor is configured to cause the first node to initiate a security handshake via the second signaling path in accordance with the updated uplink mapping information or Internet Protocol address information as part of communication via the second signaling path.
18. The first node of claim 16 , wherein, to utilize the initial uplink mapping information or Internet Protocol address information different from the updated uplink mapping information or Internet Protocol address information for the first node for communications via the first signaling path, the processor is configured to cause the first node to transmit a reconfiguration complete message to the first donor node via the first signaling path in accordance with the initial uplink mapping information or Internet Protocol address information.
19. The first node of claim 16 , wherein the processor is configured to cause the first node to transmit an acknowledgement of the reconfiguration message via the second signaling path in accordance with the updated uplink mapping information or Internet Protocol address information as part of communication via the second signaling path.
20. The first node of claim 16 , wherein the processor is configured to cause the first node to initiate a security handshake via the second signaling path in accordance with the updated uplink mapping information or Internet Protocol address information as part of communication via the second signaling path.
21. A method of wireless communication performed by a first node, the method comprising:
receiving, from a second node and via a first signaling path between the first node and a first donor node, a reconfiguration message that indicates a reconfiguration of the first node for a second signaling path, wherein the reconfiguration message indicates updated uplink mapping information or Internet Protocol address information for the first node for communications via the second signaling path;
utilizing, before communication via the second signaling path, initial uplink mapping information or Internet Protocol address information different from the updated uplink mapping information or Internet Protocol address information for the first node for communications via the first signaling path; and
communicating via the second signaling path in accordance with the reconfiguration message.
22. The method of claim 21 , wherein at least one of:
the utilizing comprises transmitting a reconfiguration complete message to the first donor node via the first signaling path in accordance with the initial uplink mapping information or Internet Protocol address information;
the method further comprises transmitting an acknowledgement of the reconfiguration message via the second signaling path in accordance with the updated uplink mapping information or Internet Protocol address information as part of communication via the second signaling path; or
the method further comprises initiating a security handshake via the second signaling path in accordance with the updated uplink mapping information or Internet Protocol address information as part of communication via the second signaling path.
23. The method of claim 21 , wherein the utilizing comprises transmitting a reconfiguration complete message to the first donor node via the first signaling path in accordance with the initial uplink mapping information or Internet Protocol address information.
24. The method of claim 21 , wherein the method further comprises transmitting an acknowledgement of the reconfiguration message via the second signaling path in accordance with the updated uplink mapping information or Internet Protocol address information as part of communication via the second signaling path.
25. The method of claim 21 , wherein the method further comprises initiating a security handshake via the second signaling path in accordance with the updated uplink mapping information or Internet Protocol address information as part of communication via the second signaling path.