NTN Configured Grant and SPS Scheduling for HARQ Separation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing hybrid automatic repeat request (HARQ) processes and configured grants in non-terrestrial networks (NTNs), leading to potential interference and reduced communication quality due to overlapping timers and delayed HARQ feedback.
Innovation Solution
The proposed solution involves a method where user equipment (UE) and network nodes use configured grants and semi-persistent scheduling (SPS) indices with HARQ process identifiers, allowing for the reservation of specific HARQ process identifiers for periodic communication configurations. This approach enables the use of separate timers and indices to avoid interference, even when communications have the same HARQ process identifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ process identifiers are reused across different periodic communication configurations, then resource utilization is improved, but interference between HARQ processes occurs due to overlapping timers
Solution Approach 1:
The patent segments the HARQ process identifier space by introducing configured grant indices and SPS indices that associate specific HARQ process identifiers with specific periodic communication configurations. This segmentation prevents interference by ensuring that HARQ processes from different configurations do not overlap, while still allowing efficient reuse of HARQ identifiers within each segmented configuration.
2Device complexity
If timers are overlapped for different periodic communication configurations, then device complexity is reduced, but interference occurs between communications with same HARQ process identifier
Solution Approach 1:
The patent introduces configured grant indices and SPS indices as intermediary parameters that mediate between the HARQ process identifier and the timer management. These indices act as additional layers of identification that allow the system to distinguish between different periodic communication configurations, enabling separate timer management without increasing overall system complexity.
3Area of stationary object
If HARQ feedback is delayed in non-terrestrial networks, then coverage area is improved, but retransmission efficiency is reduced
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple periodic communication configurations with distinct configured grant indices and SPS indices before communication occurs. This pre-configuration allows the system to immediately identify and manage separate HARQ processes for different configurations, reducing retransmission delays by avoiding timer overlaps and interference, while still maintaining the extended coverage area benefits of NTN.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication to transmit a communication associated with a configured grant in a non-terrestrial network (NTN), the indication indicating a hybrid automatic repeat request (HARQ) process identifier and a configured grant index of the communication. The UE may perform a transmission of the communication based at least in part on the HARQ process identifier and the configured grant index. Numerous other aspects are described.