Relay UE Resource Selection Using Remaining Packet Delay Budget
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Solution Overview
Problem
The challenge in wireless communication systems is to ensure that the entire packet delay budget (PDB) is met in UE-to-UE relay operations, particularly in scenarios requiring ultra-reliable and low-latency communications.
Innovation Solution
A method and apparatus for a relay UE that determines a remaining PDB based on an end-to-end PDB and timestamp, selects a resource for transmission to another UE, and transmits the message accordingly, ensuring the remaining PDB is satisfied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay UE transmits messages without considering remaining PDB, then transmission simplicity is maintained, but QoS requirements cannot be met
Solution Approach 1:
The relay UE calculates the remaining PDB in advance before transmission decision-making. By pre-computing the time budget available for transmission based on the end-to-end PDB and current timestamp, the system enables proactive QoS compliance rather than reactive adjustment, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The transmission resource selection is dynamically adjusted based on the remaining PDB value. The relay UE adapts its transmission timing and resource allocation in real-time according to the calculated remaining budget, enabling flexible QoS compliance without requiring complex static configurations.
2Reliability
If relay UE waits for split PDB to be satisfied, then transmission timing is optimized, but transmission delay increases
Solution Approach 1:
The system performs preliminary calculation of the remaining PDB at the time of transmission decision. By using the current timestamp to compute how much time budget remains, the relay UE can immediately identify suitable transmission resources without waiting for the split PDB to naturally expire, thus avoiding unnecessary delays.
Solution Approach 2:
The relay UE continuously monitors the remaining PDB and uses this feedback information to make real-time transmission decisions. This feedback mechanism allows the system to adjust transmission timing dynamically, ensuring PDB satisfaction while minimizing delay by transmitting as soon as appropriate resources become available.
3Productivity
If relay UE selects transmission resources without considering remaining PDB, then resource selection is simplified, but latency performance deteriorates
Solution Approach 1:
The relay UE changes the parameter of resource selection criteria by incorporating the remaining PDB as a filtering condition. Instead of selecting resources based solely on availability or priority, the system now evaluates resources against the remaining time budget parameter, enabling latency optimization through a straightforward parameter-based approach rather than complex algorithms.
Data Source
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AI summary
TECHNICAL FIELD An operation method of a first relay user equipment (UE) related to a packet delay budget (PDB) in UE-to-UE relay in a wireless communication system includes receiving, by the first relay UE, a message including an end-to-end PDB and a timestamp, transmitted by a first UE, determining, by the first relay UE, a remaining PDB relative based on the end-to-end PDB, using the end-to-end PDB and the timestamp, selecting, by the first relay UE, a resource to be transmitted to a second UE based on the remaining PDB and a split PDB, and transmitting, by the first relay UE, the message to a second UE on the resource.