Sidelink Relay Timing Control for Two-Hop Packet Delay Budgets
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing varying Quality of Service (QoS) requirements across different application scenarios, particularly in relay transmissions, where assigning a target Packet Delay Budget for two-hop transmissions is not adequately addressed, leading to inefficiencies and increased packet loss rates.
Innovation Solution
A method involving a first node that measures and reports the transmission state of a channel, receives configuration information based on this state, and adjusts transmission times to ensure compliance with the target Packet Delay Budget, while a second node dynamically adjusts remaining transmission times to optimize resource allocation and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If relay transmission is used to extend coverage and improve cell-edge throughput, then transmission reach is improved, but transmission delay increases due to the additional hop
Solution Approach 1:
The transmitting node pre-calculates and assigns a target packet delay budget to the relay transmission before actual data transmission occurs. This preliminary action allows the relay node to optimize its transmission timing and resource allocation in advance, ensuring that the additional hop does not excessively increase overall transmission delay.
Solution Approach 2:
The system dynamically adjusts the target packet delay budget parameter based on channel conditions, relay node capabilities, and traffic requirements. By changing this parameter adaptively, the system optimizes the trade-off between extended coverage and transmission delay for different operating scenarios.
2Reliability
If packet delay budget is strictly enforced to meet QoS requirements, then service quality is improved, but packet loss rate increases due to discarded packets exceeding the budget
Solution Approach 1:
The relay node continuously monitors actual transmission delay and provides feedback to the transmitting node. Based on this feedback, the transmitting node dynamically adjusts the target packet delay budget and retransmission strategies, balancing QoS compliance with packet loss reduction through closed-loop control.
Solution Approach 2:
The target packet delay budget is not fixed but dynamically adjusted based on real-time channel conditions, traffic priority, and relay node status. This dynamic approach allows the system to adapt to changing conditions and reduce unnecessary packet discards while maintaining QoS requirements.
3Reliability
If transmission resources are allocated conservatively to ensure delay compliance, then QoS reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The system allocates transmission resources based on partial fulfillment of delay requirements for different packet types. High-priority packets receive stricter delay guarantees with dedicated resources, while lower-priority packets use available resources more flexibly, improving overall resource utilization while maintaining essential QoS compliance.
Data Source
AI summary
The present application provides a method and a device for sidelink relay wireless communications. A first node transmits first assistance information, the first assistance information indicating a transmission state of a first channel; and receives first configuration information, the first configuration information indicating a first time length; and receives a first MAC PDU, the first MAC PDU comprising a first MAC SDU; and selects a first time unit from a first time resource pool; and transmits a second MAC PDU in the first time unit; herein, the first assistance information is used for generating the first configuration information, and the second MAC PDU comprises at least partial bits in the first MAC SDU; the first channel connects the first node to a target receiver receiving the second MAC PDU. The present application addresses the delay coordination of relay transmission.