UMTS Relay Gateways for Transparent Multihop Signaling
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Solution Overview
Problem
The integration of relays in wireless networks, particularly in UMTS systems, poses challenges such as requiring modifications to mobile devices, base stations, and network interfaces, and complicates Quality of Service (QoS) management due to differences in air-interface protocols and backhaul links.
Innovation Solution
The implementation of Remote NodeB Relay, Super-Light Router Relay, and IP Relay architectures, which allow for minimal modifications to mobile devices and network elements, using strategic Relay Gateways to manage signaling and data flow transparently across intermediary network elements, and employing specific air-interface protocol stacks for self-backhaul and access links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If relays are deployed in wireless networks to achieve coverage extension and capacity increases, then network coverage and capacity are improved, but device complexity and modification requirements increase
Solution Approach 1:
The patent introduces Relay Nodes as intermediary elements between mobile devices and base stations. These relays operate in relay mode where they receive signals from one base station and forward them to mobile devices, effectively extending network coverage without requiring direct line-of-sight connections. The relay node architecture allows existing base stations to serve as both direct serving nodes and relay nodes, maintaining network simplicity while enabling coverage extension.
Solution Approach 2:
The patent implements a universal relay node design that can function in multiple roles: serving as a relay for coverage extension, operating as a traditional base station for direct service, or functioning as a mobile device. The air interface protocol is designed to be universally applicable across all these functions, allowing the same protocol stack to handle both relay-to-base station communication and relay-to-mobile-device communication, thereby reducing overall system complexity.
2Adaptability or versatility
If air-interface protocols are modified to support multihop relaying, then relay functionality is enabled, but compatibility with existing single-hop networks deteriorates
Solution Approach 1:
The patent segments the air interface protocol into distinct functional layers: a relay control plane for managing relay functionality and a data plane for actual signal transmission. The relay control plane includes separate protocols for relay-to-base-station communication and relay-to-mobile-device communication. This segmentation allows the system to support both single-hop and multihop operations independently, maintaining protocol stability while enabling relay functionality through optional activation.
Solution Approach 2:
The patent implements dynamic protocol selection where mobile devices and base stations can dynamically determine whether to operate in single-hop or multihop mode based on network conditions. The relay nodes can be dynamically activated or deactivated without requiring protocol changes in existing network elements. This dynamic approach allows the network to adapt between single-hop and multihop operations seamlessly, maintaining backward compatibility while enabling advanced relay functionality when needed.
3Adaptability or versatility
If modifications are made to mobile devices and network elements to support relays, then relay functionality is achieved, but implementation cost increases
Solution Approach 1:
The patent implements self-service relay nodes that can autonomously select suitable base stations for relaying, dynamically adjust relay parameters, and manage their own operations without requiring manual configuration or extensive network element modifications. The relay nodes use standardized protocols to self-organize into the network and automatically adapt to changing conditions, significantly reducing implementation complexity and cost compared to traditional relay deployments requiring extensive customization.
4Ease of operation
If QoS management is simplified for relays, then implementation ease increases, but performance optimization capability deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where relay nodes continuously monitor QoS parameters such as signal strength, interference levels, and data transmission quality. Based on this feedback, relay nodes automatically adjust their operating parameters including transmission power, selection of serving base stations, and relay mode activation. This feedback-driven approach enables simple automated QoS management that maintains high performance without requiring complex manual configuration or sophisticated optimization algorithms.
Data Source
AI summary
Aspects relate to a Remote NodeB Relay that appears similar to a NodeB, a Radio Network Controller (RNC), and served mobile devices. Also provided is a Super-Light Router Relay that can provide better performance and QoS to served mobile devices while mitigating modifications to mobile devices, NodeBs, or interfaces between RNC and intermediary NodeBs. Aspects also relate to an Internet Protocol (IP) Relay that requires few, if any, modifications to mobile devices, NodeBs, or interfaces between RNC and intermediary NodeBs. Further, changes to an RNC and/or a core network can be mitigated though utilization of a strategic Relay Gateway.