Overlapping Resource Repetition for IAB Node Latency
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in optimizing resource allocation and latency in multi-hop networks due to half-duplex constraints and varying channel conditions, leading to inefficiencies in data transmission and reception.
Innovation Solution
Implementing repetition transmissions with overlapping resources across integrated access and backhaul (IAB) nodes, where the second set of resources is allocated after an early termination instance or before successful decoding, allowing for dynamic scheduling and improved latency by overlapping with remaining unused resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repetition transmissions are used to ensure reliable data delivery in multi-hop networks, then reliability is improved, but resource utilization deteriorates due to half-duplex constraints and idle time slots
Solution Approach 1:
The patent applies preliminary action by allowing the forwarding entity to prepare and encode data packets for subsequent hops in advance, during time slots when the reception entity is still receiving repetitions. This enables the forwarding entity to have data ready for immediate transmission when resources become available, eliminating idle time and improving resource utilization while maintaining reliable multi-hop data delivery
Solution Approach 2:
The patent implements continuity of useful action by enabling overlapping operations where the forwarding entity continuously encodes and prepares data packets during the reception entity's decoding period, and the reception entity continuously receives and decodes packets during the forwarding entity's encoding period. This eliminates idle time slots and ensures continuous productive use of network resources, improving both reliability and resource utilization
2Measurement precision
If the reception entity waits for complete decoding before the forwarding entity transmits to the next hop, then decoding accuracy is improved, but latency increases
Solution Approach 1:
The patent applies preliminary action by having the forwarding entity begin encoding data packets for the next hop during the reception entity's decoding period, before the reception entity completes decoding. This preliminary preparation eliminates waiting time and reduces overall latency while the reception entity continues to decode with sufficient time to ensure accuracy
Solution Approach 2:
The patent implements dynamics by allowing flexible, overlapping timing relationships between reception and forwarding operations. The system dynamically adjusts the timing of encoding, decoding, and transmission operations to overlap them where possible, optimizing the balance between decoding accuracy and transmission latency based on actual channel conditions and data availability
Data Source
AI summary
Aspects presented herein relate to methods and devices for wireless communication including an apparatus, e.g., a node or a base station. In one aspect, the apparatus may receive, via a first set of resources, communication including at least one data packet, the first set of resources allocated for a reception entity of the node. The apparatus may also decode, at the reception entity, the at least one data packet during a decoding period, the decoding period including a decoding start time and a decoding completion time. Additionally, the apparatus may transmit, via a second set of resources, the communication including the at least one data packet to a next hop node, the second set of resources allocated for a forwarding entity of the node, at least one first resource overlapping with at least one second resource.