Enforcing packet delay budgets associated with multi-hop IAB
A device may transmit data to a first parent node via a first link and to a second parent node via a second link. The device may receive configuration information indicating at least one of: a first buffer threshold associated with a first remaining packet delay budget (PDB), a second buffer threshold associated with a second remaining PDB, or a remaining PDB threshold. The device may receive a packet and may determine a remaining PDB. The device may select a buffer threshold based on the configuration information and the determined remaining PDB. If an amount of data in an uplink (UL) buffer is equal to or above the selected buffer threshold, the device may transmit the packet via a first available link. If the determined remaining PDB is less than the remaining PDB threshold, the device may transmit the packet via both the first link and the second link.
1 . A device, comprising:
a processor configured to:
transmit data to a first parent node via a first link and to a second parent node via a second link;
receive configuration information associated with a bearer or a backhaul radio link control (BH RLC) channel, wherein:
the configuration information indicates a first buffer threshold and a second buffer threshold,
the first buffer threshold is associated with a first remaining packet delay budget (PDB) range and the first link, and
the second buffer threshold is associated with a second remaining PDB range and the second link;
receive a packet and determine a remaining PDB associated with the packet;
select a buffer threshold based on the configuration information and the determined remaining PDB associated with the packet, wherein the selected buffer threshold is the first buffer threshold or the second buffer threshold; and
transmit the packet, wherein the packet is transmitted:
via the first link if the selected buffer threshold is the first buffer threshold, or
via the second link if the selected buffer threshold is the second buffer threshold.
2 . The device of claim 1 , wherein the device is an integrated access and backhaul (IAB) node.
3 . The device of claim 2 , wherein the device is a mobile termination (MT) part of the IAB node or a distributed unit (DU) part of the IAB node.
4 . The device of claim 1 , wherein the device is a wireless transmit/receive unit (WTRU).
5 . The device of claim 4 , wherein the WTRU is comprised in a multi-hop IAB node.
6 . The device of claim 1 , wherein the first link is a default link and the second link is a secondary link.
7 . The device of claim 1 , wherein the first remaining PDB range is below a value and the second remaining PDB range is above the value.
8 . A method implemented within a device, the method comprising:
transmitting data to a first parent node via a first link and to a second parent node via a second link;
receiving configuration information associated with a bearer or a backhaul radio link control (BH RLC) channel, wherein:
the configuration information indicates a first buffer threshold and a second buffer threshold,
the first buffer threshold is associated with a first remaining packet delay budget (PDB) range and the first link, and
the second buffer threshold is associated with a second remaining PDB range and the second link;
receiving a packet and determine a remaining PDB associated with the packet;
selecting a buffer threshold based on the configuration information and the determined remaining PDB associated with the packet, wherein the selected buffer threshold is the first buffer threshold or the second buffer threshold; and
transmitting the packet, wherein the packet is transmitted:
via the first link if the selected buffer threshold is the first buffer threshold, or
via the second link if the selected buffer threshold is the second buffer threshold.
9 . The method of claim 8 , wherein the device is an integrated access and backhaul (IAB) node.
10 . The method of claim 9 , wherein the device is a mobile termination (MT) part of the IAB node or a distributed unit (DU) part of the IAB node.
11 . The method of claim 8 , wherein the device is a wireless transmit/receive unit (WTRU).
12 . The method of claim 11 , wherein the WTRU is operating in a multi-hop IAB node.
13 . The method of claim 8 , wherein the first link is a default link and the second link is a secondary link.
14 . The method of claim 8 , wherein the first remaining PDB range is below a value and the second remaining PDB range is above the value.
15 . A device, comprising:
a processor configured to:
transmit data to a first parent node via a first link and to a second parent node via a second link;
receive configuration information associated with a bearer or a backhaul radio link control (BH RLC) channel, wherein the configuration information indicates a remaining packet delay budget (PDB) threshold;
receive a packet and determine a remaining PDB associated with the packet; and
based on the determined remaining PDB associated with the packet being less than the remaining PDB threshold,
duplicate the packet, and
transmit the packet to the first parent node via-both the first link and the duplicated packet to the second parent node via the second link.
16 . The device of claim 15 , wherein the processor is further configured to:
send a scheduling request (SR) or buffer status report (BSR) to the first parent node if resources are not available on the first link; and
send an SR or a BSR to the second parent node if resources are not available on the second link.
17 . The device of claim 15 , wherein the device is an integrated access and backhaul (IAB) node.
18 . The device of claim 17 , wherein the device is a mobile termination (MT) part of the IAB node or a distributed unit (DU) part of the IAB node.
19 . The device of claim 15 , wherein the device is a wireless transmit/receive unit (WTRU).
20 . The device of claim 19 , wherein the WTRU is operating in a multi-hop IAB node.