CN-115968567-B - Delay bound for scheduling priority and packet dropping in integrated access and backhaul networks

Abstract

A method, computer-readable medium, and apparatus for wireless communication at an Integrated Access and Backhaul (IAB) node are provided. The IAB node receives a first delay parameter associated with a packet and a second delay parameter associated with a discard determination for the packet and the second delay parameter associated with scheduling the packet for transmission. The IAB node performs a discard decision for the packet based on the associated first delay parameter or schedules the packet for transmission to a second IAB node or User Equipment (UE) using a second delay parameter associated with the packet. A Central Unit (CU) of the IAB network may indicate to the IAB node a second delay parameter for scheduling the packet and a first delay parameter for determining whether to drop the packet.

Inventors

• J.Luo
• K.G. Hampel
• N. Abedini
• N. Akler
• LUO TAO
• L. Blessant
• LI JUANYI

Assignees

• 高通股份有限公司

Dates

Publication Date

20260512

Application Date

20210805

Priority Date

20210804

Claims (20)

1. 1. An apparatus for wireless communication at a first Integrated Access and Backhaul (IAB) node acting as an intermediate node in a multi-hop path between a donor Central Unit (CU) and a serving IAB node providing an access Radio Link Channel (RLC) to a User Equipment (UE), comprising: Memory, and At least one processor coupled to the memory and configured to cause the apparatus to: Receiving, from the donor CU, a first Packet Delay Budget (PDB) parameter corresponding to an end-to-end PDB for a packet to the UE and a second PDB parameter corresponding to a one-hop PDB for the packet to the UE, the first PDB parameter for the packet being based on the end-to-end PDB between a user plane function and the UE, and the second PDB parameter indicating a single-hop backhaul Radio Link Control (RLC) PDB for the packet, the first PDB parameter being associated with a discard determination for the packet and the second PDB parameter being associated with scheduling the packet for transmission; At the first IAB node, performing a discard decision as to whether to discard the packet based on the first PDB parameter corresponding to the end-to-end PDB associated with the packet, and At the first IAB node, the packet is scheduled for transmission to a second IAB node using the second PDB parameter corresponding to the one-hop PDB associated with the packet.
2. 2. The apparatus of claim 1, wherein the at least one processor is configured to cause the apparatus to schedule the packet for transmission to the second IAB node using the second PDB parameter corresponding to the one-hop PDB associated with the packet, comprising prioritizing the transmission of the packet in relation to a plurality of Radio Link Control (RLC) channels when the discard decision indicates that the packet is not to be discarded based on the first PDB parameter corresponding to the end-to-end PDB.
3. 3. The apparatus of claim 2, wherein the plurality of RLC channels comprises one or more backhaul RLC channels and one or more access RLC channels.
4. 4. The apparatus of claim 1, wherein the discard decision is based on whether a delay of the packet exceeds the first PDB parameter corresponding to the end-to-end PDB.
5. 5. The apparatus of claim 4, wherein the latency corresponds to a latency between a Distributed Unit (DU) of the first IAB node and a child node scheduled by the first IAB node for the single hop.
6. 6. The apparatus of claim 4, wherein the delay comprises one or more hops before the first IAB node.
7. 7. The apparatus of claim 6, wherein the delay of the packet is based on a timestamp in a header of the packet.
8. 8. The apparatus of claim 7, wherein the timestamp is included in a Backhaul Adaptation Protocol (BAP) layer header.
9. 9. The apparatus of claim 7, wherein the delay is based on receipt of the packet at the first IAB node.
10. 10. The apparatus of claim 6, wherein the delay comprises a delay of a current hop provided by the first IAB node.
11. 11. The apparatus of claim 1, wherein the first PDB parameter is greater than the second PDB parameter.
12. 12. The apparatus of claim 1, wherein the first PDB parameter is based on the end-to-end PDB minus a core network PDB between the user plane function and the UE.
13. 13. The apparatus of claim 1, wherein the second PDB parameter is indicated in an F1-AP message.
14. 14. The apparatus of claim 1, wherein the at least one processor is configured to cause the apparatus to skip dropping of a second packet based on not receiving an indication of the first PDB parameter for the second packet.
15. 15. The apparatus of claim 1, wherein the first PDB parameter is indicated for a Radio Link Control (RLC) channel of an aggregate delay critical Guaranteed Bit Rate (GBR) flow.
16. 16. The apparatus of claim 1, further comprising: Antenna, and A transceiver coupled to the antenna and the at least one processor.
17. 17. The apparatus of claim 1, wherein the first PDB parameter is a multi-hop between the CU and the UE of the packet that includes a plurality of intermediate IAB nodes.
18. 18. The apparatus of claim 1, wherein the first and second PDB parameters are used for different determinations for a same packet, the different determinations including the discard decision and a scheduling decision.
19. 19. A method of wireless communication at a first Integrated Access and Backhaul (IAB) node acting as an intermediate node in a multi-hop path between a donor Central Unit (CU) and a serving IAB node providing access Radio Link Channels (RLC) to a User Equipment (UE), the method comprising: Receiving, from the donor CU, a first Packet Delay Budget (PDB) parameter corresponding to an end-to-end PDB for a packet to the UE and a second PDB parameter corresponding to a one-hop PDB for the packet to the UE, the first PDB parameter for the packet being based on the end-to-end PDB between a user plane function and the UE, and the second PDB parameter indicating a single-hop backhaul Radio Link Control (RLC) PDB for the packet, the first PDB parameter being associated with a discard determination for the packet and the second PDB parameter being associated with scheduling the packet for transmission; At the first IAB node, performing a discard decision as to whether to discard the packet based on the first PDB parameter corresponding to the end-to-end PDB associated with the packet, and At the first IAB node, the packet is scheduled for transmission to a second IAB node using the second PDB parameter corresponding to the one-hop PDB associated with the packet.
20. 20. An apparatus for wireless communication at a Central Unit (CU) of an Integrated Access and Backhaul (IAB) network, comprising: Memory, and At least one processor coupled to the memory and configured to cause the apparatus to: Indicating from the CU to an IAB node a first Packet Delay Budget (PDB) parameter corresponding to an end-to-end PDB for a packet and a second Packet Delay Budget (PDB) parameter corresponding to a one-hop PDB for the packet, the first PDB parameter for the packet being based on the end-to-end PDB between a user plane function and a User Equipment (UE), and the second PDB parameter indicating a one-hop backhaul Radio Link Control (RLC) PDB for the packet, the first PDB parameter for the IAB node to determine whether to drop the packet and the second PDB parameter for the IAB node to schedule the packet, and The packet is sent for transmission to the UE via one or more IAB nodes including the IAB node.

Description

Delay bound for scheduling priority and packet dropping in integrated access and backhaul networks Cross Reference to Related Applications The present application claims the benefit and priority of U.S. provisional application serial No.63/072,731, entitled "Delay Bounds for Scheduling Priority and Packet Discard in an Integrated Access and Backhaul Network", filed on even 31 at 8/2020, and U.S. patent application No.17/394,331, entitled "DELAY BOUNDS FOR SCHEDULING PRIORITY AND PACKET DISCARD IN AN INTEGRATED ACCESS AND BACKHAUL NETWORK", filed on even 4 at 8/2021, which are expressly incorporated herein by reference in their entirety. Technical Field The present disclosure relates generally to communication systems, and more particularly to wireless communications including Integrated Access and Backhaul (IAB) networks. Background Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may employ multiple-access techniques capable of supporting communication with multiple users by sharing the available system resources. Examples of such multiple-access techniques include Code Division Multiple Access (CDMA) systems, time Division Multiple Access (TDMA) systems, frequency Division Multiple Access (FDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems. These multiple access techniques have been employed in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate at the urban, national, regional, and even global levels. One example telecommunications standard is 5G New Radio (NR). The 5G NR is part of the continuous mobile broadband evolution promulgated by the third generation partnership project (3 GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., scalability with the internet of things (IoT)) and other requirements. The 5G NR includes services associated with enhanced mobile broadband (eMBB), large-scale machine type communications (mMTC), and ultra-reliable low-delay communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There is a need for further improvements in 5G NR technology. These improvements may also be applicable to other multiple access techniques and telecommunication standards employing these techniques. Disclosure of Invention The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. In an aspect of the disclosure, a method, computer-readable medium, and apparatus for wireless communication at an IAB node are provided. The IAB node apparatus receives a first delay parameter associated with a packet and a second delay parameter associated with a discard determination of the packet and the second delay parameter associated with scheduling the packet for transmission. The transmission of the packet may involve a period of time, e.g., with one or more retransmissions, such as hybrid automatic repeat request (HARQ) retransmissions or Radio Link Control (RLC) layer retransmissions. The IAB node discards the packet based on a first delay parameter associated with the packet or schedules the packet for transmission to a second IAB node or User Equipment (UE) using a second delay parameter associated with the packet. For example, if the delay exceeds the first delay parameter, the IAB node may discard the packet and stop transmitting in the middle of the transmission process. If the delay is less than the first delay parameter, the IAB node may schedule the packet for transmission based on the second delay parameter. In another aspect of the disclosure, a method, computer-readable medium, and apparatus for wireless communication of an IAB node are provided. The device receives a first delay parameter associated with a packet and a second delay parameter associated with a discard determination of the packet and the second delay parameter is associated with scheduling the packet for transmission. The apparatus performs a discard decision based on a first delay parameter associated with the packet and schedules the packet for transmission to a second IAB node or UE using a second delay parameter associated with the packet. In another aspect of the disclosure, a method, computer-readable medium, and apparatus for wireless comm