Dynamic route selection in integrated access and backhaul system
A method including receiving, by at least one integrated access and backhaul node and donor distributed unit, routing information and preference information to reach at least one mobile terminal and the at least one donor in an integrated access and backhaul node topology. The method further includes transmitting at least one link event notification, and receiving at least one link event notification. The method also includes adapting at least one of an uplink route and a downlink route based on the preference information and the at least one link event notification.
1 . An apparatus comprising
at least one processor; and
at least one memory storing instructions that, when executed with the at least one processor, cause the apparatus at least to:
receive routing information to reach at least one of at least one mobile terminal, or at least one donor distributed unit, in an integrated access and backhaul node topology;
receive preference information indicating at least an adaptable preferred route to reach the at least one of the at least one mobile terminal, or the at least one donor distributed unit, in the integrated access and backhaul node topology, wherein the preference information comprises at least a route identifier identifying the adaptable preferred route within the routing information, wherein the adaptable preferred route comprises a route preferred by a donor central unit, wherein the adaptable preferred route comprises a route for transmission of downlink traffic for at least one integrated access and backhaul node;
transmit and/or receive at least one link event notification; and
adapt the adaptable preferred route based on the preference information, the routing information and the at least one link event notification.
2 . The apparatus according to claim 1 , wherein the apparatus comprises, or is comprised in, another integrated access and backhaul node or the at least one donor distributed unit.
3 . The apparatus according to claim 1 , wherein the at least one link event notification is transmitted and/or received via an adaptation layer header, wherein the at least one link event notification is transmitted and/or received in response to at least one of:
throughput characteristics of a link changing significantly, a number of hybrid automatic repeat request retransmissions on a link reaching a first number,
a number of radio link control automatic repeat request retransmissions reaching a second number, or
a radio link availability or route availability is changed.
4 . The apparatus according to claim 1 , wherein transmitting the at least one link event notification comprises the instructions, when executed with the at least one processor, cause the apparatus to:
transmit the at least one link event notification to at least one of
at least one downstream integrated access and backhaul node,
at least one upstream integrated access and backhaul node, or
the at least one donor distributed unit; and/or
wherein receiving the at least one link event notification comprises the instructions, when executed with the at least one processor, cause the apparatus to:
receive the at least one link event notification from at least one of
the at least one downstream integrated access and backhaul node,
the at least one upstream integrated access and backhaul node, or
the at least one donor distributed unit.
5 . The apparatus according to claim 1 , wherein the at least one link event notification is associated with at least part of the adaptable preferred route, wherein the at least one link event notification comprises an indication of at least one of:
a binary indication of a radio link availability, or a route availability, or a link is resumed after declaring no route available; or
several levels indicating radio link quality.
6 . The apparatus according to claim 1 , wherein the routing information is comprised in at least one front haul application protocol signaling message and the preference information is comprised in an adaptation header of a downlink data packet.
7 . The apparatus according to claim 1 , wherein receiving the routing information and the preference information comprises the instructions, when executed with the at least one processor, cause the apparatus to:
receive the routing information via C-plane signalling using at least one of radio resource control or front haul application protocol; and/or
receive the preference information via U-plane signalling, wherein at least one adaptation header comprises the preference information.
8 . The apparatus according to claim 1 , wherein the instructions, when executed with the at least one processor, cause the apparatus to:
propagate the at least one link event notification to at least one next-hop route.
9 . A method comprising:
receiving routing information to reach at least one of at least one mobile terminal, or at least one donor distributed unit, in an integrated access and backhaul node topology;
receiving preference information indicating at least an adaptable preferred route to reach the at least one of the at least one mobile terminal, or the at least one donor distributed unit, in the integrated access and backhaul node topology, wherein the preference information comprises at least a route identifier identifying the adaptable preferred route within the routing information, wherein the adaptable preferred route comprises a route preferred by a donor central unit, wherein the adaptable preferred route comprises a route for transmission of downlink traffic for at least one integrated access and backhaul node;
transmitting and/or receiving at least one link event notification; and
adapting the adaptable preferred route based on the preference information, the routing information and the at least one link event notification.
10 . The method according to claim 9 , wherein the at least one link event notification is transmitted and/or received in response to at least one of:
throughput characteristics of a link changing significantly,
a number of hybrid automatic repeat request retransmissions on a link reaching a first number,
a number of radio link control automatic repeat request retransmissions reaching a second number, or
a radio link availability or route availability is changed.
11 . The method according to claim 9 , wherein transmitting the at least one link event notification comprises
transmitting the at least one link event notification to at least one of
at least one downstream integrated access and backhaul node,
at least one upstream integrated access and backhaul node, or
the at least one donor distributed unit; and/or
wherein receiving the at least one link event notification comprises
receiving the at least one link event notification from at least one of
the at least one downstream integrated access and backhaul node,
the at least one upstream integrated access and backhaul node, or
the at least one donor distributed unit.
12 . The method according to claim 9 , wherein the at least one link event notification comprises an indication of at least one of:
a binary indication of a radio link availability, or a route availability, or a link is resumed after declaring no route available; or
several levels indicating radio link quality.
13 . The method according to claim 9 , wherein the routing information is comprised in at least one front haul application protocol signaling message and the preference information is comprised in an adaptation header of a downlink data packet.
14 . The method according to claim 9 , wherein the receiving of the routing information and the preference information comprises:
receiving the routing information via C-plane signalling using at least one of radio resource control or front haul application protocol; and/or
receiving the preference information via U-plane signalling, wherein at least one adaptation header comprises the preference information.
15 . A non-transitory computer-readable medium comprising instructions stored thereon for performing at least the following:
causing receiving of routing information to reach at least one of at least one mobile terminal, or at least one donor distributed unit, in an integrated access and backhaul node topology;
causing receiving of preference information indicating at least an adaptable preferred route to reach the at least one of the at least one mobile terminal, or the at least one donor distributed unit, in the integrated access and backhaul node topology, wherein the preference information comprises at least a route identifier identifying the adaptable preferred route within the routing information, wherein the adaptable preferred route comprises a route preferred by a donor central unit, wherein the adaptable preferred route comprises a route for transmission of downlink traffic for at least one integrated access and backhaul node;
causing transmitting and/or receiving at least one link event notification; and
adapting the adaptable preferred route based on the preference information, the routing information and the at least one link event notification.
16 . The non-transitory computer-readable medium of claim 15 , wherein the at least one link event notification is caused to be transmitted and/or received in response to at least one of:
throughput characteristics of a link changing significantly,
a number of hybrid automatic repeat request retransmissions on a link reaching a first number,
a number of radio link control automatic repeat request retransmissions reaching a second number, or
a radio link availability or route availability is changed.
17 . The non-transitory computer-readable medium of claim 15 , wherein causing transmitting of the at least one link event notification comprises
causing transmitting of the at least one link event notification to at least one of
at least one downstream integrated access and backhaul node,
at least one upstream integrated access and backhaul node, or
the at least one donor distributed unit; and/or
wherein causing receiving of the at least one link event notification comprises
causing receiving of the at least one link event notification from at least one of
the at least one downstream integrated access and backhaul node,
the at least one upstream integrated access and backhaul node, or
the at least one donor distributed unit.
18 . The non-transitory computer-readable medium of claim 15 , wherein the at least one link event notification comprises an indication of at least one of:
a binary indication of a radio link availability, or a route availability, or a link is resumed after declaring no route available; or
several levels indicating radio link quality.
19 . The non-transitory computer-readable medium of claim 15 , wherein the routing information is comprised in at least one front haul application protocol signaling message and the preference information is comprised in an adaptation header of a downlink data packet.