Configured Grant PUSCH Timing and HARQ ID Mapping for XR Traffic
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Solution Overview
Problem
Existing wireless communication technologies struggle to efficiently handle large and variable packet sizes with stringent latency requirements, particularly in beyond 5G and 6G communications, such as extended reality (XR) services, where configured grants (CG) face challenges in managing quasi-periodic data with jitter impacts.
Innovation Solution
The method involves determining multiple CG physical uplink shared channel (PUSCH) occasions in a period by using control signaling to derive time locations and HARQ process identifiers based on first and second equations, incorporating parameters like resource location, periodicity, and scheduling information to optimize transmission occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple CG PUSCH occasions are used to handle large and variable packet sizes, then data transmission efficiency is improved, but HARQ process identifier management complexity increases
Solution Approach 1:
The patent segments the HARQ process identifiers into different sets based on the occasion index within a time duration. Specifically, it divides the HARQ process identifiers into a first set for first transmission occasions and a second set for second transmission occasions, where the sets are determined by modulo operations on the occasion index. This segmentation allows the system to manage multiple transmission occasions without requiring a single large pool of HARQ process identifiers, thereby reducing management complexity while maintaining transmission efficiency.
Solution Approach 2:
The patent changes the parameter of HARQ process identifier selection based on the occasion index within the time duration. By using modulo operations with different divisors (first modulus and second modulus) corresponding to different transmission occasions, the system dynamically selects appropriate HARQ process identifiers from different sets. This parameter change approach enables efficient handling of multiple transmission occasions while keeping the HARQ process identifier management systematic and organized.
2Loss of time
If multiple transmission occasions are configured in a period, then latency requirement is reduced, but control signaling complexity increases
Solution Approach 1:
The patent makes the control signaling multi-functional by using the same signaling structure to convey multiple types of information: time duration, number of transmission occasions, occasion indices, and HARQ process identifier set assignments. The control signaling simultaneously configures both the time domain resources and the HARQ process identifier management, eliminating the need for separate signaling mechanisms and thereby reducing overall control signaling complexity while supporting low latency transmission.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the HARQ process identifier sets and their assignment rules in the control signaling before the actual transmission occurs. The system pre-determines which HARQ process identifiers belong to which transmission occasions using modulo operations, so that during transmission, the terminal can directly retrieve the appropriate HARQ process identifiers without additional signaling or complex calculations, thereby reducing control signaling complexity while meeting latency requirements.
3Reliability
If HARQ process identifiers are assigned based on time locations, then transmission reliability is improved, but calculation complexity increases
Solution Approach 1:
The patent changes the parameter of HARQ process identifier assignment from arbitrary or complex time-based mapping to a systematic modulo-based approach. By using modulo operations with specific divisors (first modulus and second modulus) on the occasion index, the system achieves reliable HARQ process identifier assignment that is both time-location based and computationally simple. This parameter change maintains transmission reliability while significantly reducing calculation complexity compared to more complex time-based mapping approaches.
Data Source
AI summary
The present disclosure relates to method, systems and devices for wireless communication. The present disclosure relates to wireless communication method for use in a wireless terminal, the method comprising receiving, from a wireless network node, a control signaling, determining a plurality of time locations of a plurality of transmission occasions in a time duration based on a first equation using at least one first parameter indicated by the control signaling, and determining a plurality of hybrid automatic retransmission request (HARQ) process identifiers (IDs) for the transmission occasions in the time duration based on a second equation using at least one second parameter indicated by the control signaling.