LTE-A Relay Bearer Mapping for QoS Assurance
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Solution Overview
Problem
The existing LTE network's traffic bearer mapping mechanism cannot ensure quality of service (QoS) for multi-service transmission in LTE-A networks after the introduction of a relay node, as it fails to effectively manage the traffic data flow through the relay node.
Innovation Solution
A traffic bearer mapping method that involves obtaining attribute information of the traffic data flow and selecting a relay transmission tunnel, including a Un RB or a bearer with a Un RB, to map and de-map the traffic data flow for transmission, ensuring proper routing and quality of service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing LTE network's traffic bearer mapping mechanism is used, then the network structure is simple and easy to manage, but it cannot ensure quality of service (QoS) for multi-service transmission in LTE-A networks after introducing relay nodes
Solution Approach 1:
The patent segments the bearer mapping process into distinct stages: establishing Un bearers between relay nodes and base stations, mapping Uu bearers to Un bearers at the relay node, and managing the correspondence between these bearers. This segmentation allows complex QoS requirements to be handled systematically at each stage rather than requiring a completely new complex mapping mechanism.
Solution Approach 2:
The relay node acts as an intermediary in the bearer mapping process, receiving Uu bearers from user equipment and mapping them to Un bearers for transmission to the base station. This intermediary role enables the existing LTE bearer mapping mechanism to be extended to LTE-A networks without requiring fundamental changes to the core network architecture.
2Adaptability or versatility
If relay nodes are introduced to enable multi-hop transmission, then network coverage and service capability are improved, but the traffic bearer mapping mechanism becomes insufficient for managing traffic data flow
Solution Approach 1:
The patent establishes Un bearers between relay nodes and base stations in advance, before actual traffic flow needs to be routed. This preliminary setup of the relay transmission tunnel allows traffic data flow to be efficiently mapped and managed once relay nodes are deployed, avoiding the need for complex real-time bearer establishment during traffic routing.
Solution Approach 2:
The bearer mapping mechanism described in the patent provides universal functionality that works for both direct base station connections and relay node connections. The same fundamental mapping principles apply whether traffic flows directly from user equipment to base station or through relay nodes, simplifying operation and management across different network configurations.
3Device complexity
If a one-to-one mapping relationship is maintained between bearers as in existing LTE networks, then the mapping is simple and straightforward, but it cannot implement the transmission of traffic data flow through relay nodes in LTE-A networks
Solution Approach 1:
The patent implements a nested mapping structure where Uu bearers (user equipment to relay node) are mapped to Un bearers (relay node to base station), which are themselves part of the broader EPS bearer structure. This nested approach maintains the simplicity of one-to-one mapping at each level while enabling complex multi-hop transmission paths through the relay node infrastructure.
Data Source
AI summary
A traffic bearer mapping method includes: obtaining attribute information of a traffic data flow of a user; selecting a relay transmission tunnel according to the attribute information of the traffic data flow of the user; and mapping the received traffic data flow to the relay transmission tunnel for transmission, where the relay transmission tunnel includes a relay link radio bearer Un RB or a bearer including the Un RB. Transmission of a traffic data flow in an LTE-A network after a relay node is introduced into is implemented, thereby ensuring quality of service of multi-service.