IAB Relay Transmission Points Multiplexing
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Solution Overview
Problem
Current wireless communication systems face challenges in integrating wireless backhaul communications and access communications efficiently, particularly in 5G networks, which require high capacity, low latency, and massive connectivity, while existing technologies struggle with interference and resource management.
Innovation Solution
The integration of wireless backhaul and access communications using relay transmission points (rTPs) that employ multiplexing schemes such as time division multiplexing (TDM), frequency division multiplexing (FDM), and hybrid FDM/TDM, along with phased array transmissions, to enable efficient resource management and fast route switching, allowing for ultra-dense deployment of mmWave transmission points without increasing wired transport nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless backhaul and access communications are integrated using relay transmission points, then network capacity and scalability are improved, but interference management and resource allocation become more complex
Solution Approach 1:
The patent segments the wireless communication resources by dividing them into access links (between UE and rTP) and backhaul links (between rTP and donor gNB). This segmentation allows independent resource management and allocation strategies for each link type, reducing the overall complexity while enabling integrated operation. The time-frequency resources are partitioned into separate access and backhaul portions, allowing targeted optimization for each function.
Solution Approach 2:
The patent introduces spatial dimensionality through the use of relay transmission points positioned in the network to provide both access and backhaul functions. By utilizing the spatial dimension with multiple rTPs distributed across the network, the system achieves enhanced capacity and coverage while managing interference through spatial separation. This dimensional approach allows simultaneous access and backhaul operations without direct interference.
2Adaptability or versatility
If relay transmission points are deployed to provide both access and backhaul functions, then network scalability is improved, but latency increases due to additional relay hops
Solution Approach 1:
The patent implements preliminary action by pre-configuring relay transmission points with both access and backhaul capabilities before deployment. The rTPs are pre-synchronized with the donor gNB and pre-allocated resource configurations are established in advance. This preliminary setup enables direct routing of data through pre-established paths, reducing the need for dynamic routing decisions and associated latency during actual communication.
Solution Approach 2:
The patent introduces dynamic resource allocation and adaptive routing mechanisms that allow the network to dynamically adjust the number and positioning of relay hops based on traffic conditions. When low latency is required, the system can dynamically select direct access paths or reduce the number of relay hops. The resource allocation between access and backhaul links is dynamically adjusted to optimize for latency-sensitive applications.
3Object-affected harmful factors
If time division multiplexing is used to separate access and backhaul communications, then interference is reduced, but resource utilization efficiency decreases
Solution Approach 1:
The patent implements periodic time division multiplexing where access and backhaul communications are allocated specific time slots in a periodic pattern. This periodic structure allows predictable interference management while maintaining efficient resource utilization. The periodic switching between access and backhaul modes at rTPs creates structured opportunities for both functions to operate with guaranteed resource allocation, balancing interference reduction with efficient spectrum usage.
4Ease of operation
If frequency division multiplexing is used to separate access and backhaul communications, then simultaneous operations are enabled, but spectrum requirements increase
Solution Approach 1:
The patent implements frequency division multiplexing where the same frequency spectrum is universally used for both access and backhaul communications through different spatial paths. The rTPs transmit and receive both access signals (to UEs) and backhaul signals (to donor gNB) on overlapping frequency resources. This universal spectrum usage enables simultaneous operations without requiring additional spectrum, as the spatial separation at rTPs provides the necessary isolation.
Data Source
AI summary
Establishment of integrated links comprising integrated wireless backhaul communications links and access communications links is facilitated by transmitting multiplexed sync signals to enable synchronization between the relay transmission point devices, and using a random access channel procedure to complete the establishment. The integrated wireless backhaul communications links and access communications links can be maintained by measuring channel characteristics of the backhaul communications links using a measurement reference signal.