Wireless Node Spectrum Sharing for IAB Backhaul Delay
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Solution Overview
Problem
In integrated access and backhaul (IAB) networks, the high load and end-to-end transmission delay of AP-AP backhaul links lead to increased buffering costs and scheduling delays, which are exacerbated by the sharing of radio resources between access and backhaul links, limiting the number of hops and CPEs that can be supported in delay-sensitive applications.
Innovation Solution
A node in the wireless communication system is adapted to communicate with other nodes by sharing spectrum resources, allowing for re-transmission of failed signals with tolerable interference and adapting transmission rates, thereby reducing backhauling load and end-to-end transmission delay, and utilizing available spectral resources to improve channel quality and reduce buffer requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radio resources are shared between access and backhaul links in IAB networks, then resource utilization efficiency is improved, but transmission reliability deteriorates due to interference and competition
Solution Approach 1:
The patent segments the shared radio resources into different resource pools: one pool for access links and another pool for backhaul links. This segmentation allows independent management and allocation of resources for each link type, reducing interference while maintaining overall resource utilization efficiency. The base station can allocate specific time-frequency resources to access and backhaul transmissions without excessive competition.
Solution Approach 2:
The patent applies local quality by allowing different quality-of-service parameters and resource allocation strategies for access and backhaul links within the same IAB network. Access links can prioritize latency-sensitive traffic while backhaul links can optimize for throughput, enabling each link type to operate with locally optimized parameters that enhance overall system reliability.
2Area of stationary object
If the number of hops in multi-hop IAB networks is increased to extend coverage, then network coverage is improved, but end-to-end transmission delay increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing optimal routing paths and resource allocations for multi-hop transmissions. When data needs to be transmitted through multiple hops, the base station has already prepared the forwarding paths and allocated resources in advance, significantly reducing the actual transmission delay while maintaining extended network coverage through multiple hops.
Solution Approach 2:
The patent applies dynamics by enabling dynamic route selection and resource allocation adjustments based on real-time network conditions. When channel conditions change or traffic patterns vary, the system can dynamically reroute transmissions through alternative hops or adjust resource allocation to minimize delay, allowing the network to maintain both extended coverage and acceptable latency.
3Reliability
If buffer size is increased to handle high load on backhaul links, then data loss is reduced, but device complexity and cost increase
Solution Approach 1:
The patent implements continuity of useful action by ensuring continuous resource allocation and prioritized scheduling for backhaul link transmissions. High-priority backhaul traffic is continuously served without unnecessary queuing delays, reducing the need for large buffers to prevent data loss. The system maintains continuous transmission flow through efficient resource management rather than relying on large buffer capacities.
4Productivity
If spectrum sharing between access and backhaul is implemented, then spectral efficiency is improved, but interference increases affecting signal quality
Solution Approach 1:
The patent segments the spectrum into distinct resource pools for access and backhaul links, with each pool operating in dedicated time-frequency slots. This segmentation reduces spectral overlap and interference between access and backhaul transmissions while maintaining high overall spectral efficiency through efficient utilization of the divided resources.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of intelligent resource allocation and interference coordination algorithms at the base station. These algorithms act as intermediaries that manage spectrum sharing by dynamically adjusting resource allocation to minimize interference between access and backhaul transmissions, enabling spectrum sharing while maintaining signal quality.
Data Source
AI summary
A first type node (AP0, AP1, AP2) in a wireless communication system (1), wherein the first type node (AP0, AP1, AP2) is adapted to: —communicate with at least one other first type node (AP0, AP1, AP2) in the wireless communication system (1) over a corresponding channel (hA01, hA12), and —transmit a first plurality of signals (x11, x1i, X1N, X21, X2i, X2N−1) to the other first type node (AP0, AP1, AP2). In the case of the other first type node (AP0, AP1, AP2) requesting re-transmission of a failed signal (x11) in the first plurality of signals (x11, x′1i, X1N, X21, X2i, X2N−1), the first type node (APo, AP1, AP2) is further adapted to: —receive a limit of tolerable interference from the other first type node (APo, APi, AP2), and —re-send the failed signal (xn) in a second plurality of signals (x11, x′2i x′1i, X′1N, X′21, X′2N−1, X′2N, X2N; X11, x′2i, x′1i, X′1N, x′21, x′2N−1, X2N) to the other first type node (AP0, AP1, AP2) while sharing the spectrum for the failed signal (x11) with an additional signal (x′2i) without exceeding the limit of tolerable interference.