Relay Station QoS Mapping for Cellular Networks
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Solution Overview
Problem
In cellular mobile communication systems, ensuring consistent Quality of Service (QoS) between the user apparatus and the base station via a relay station is challenging due to different protocol stacks on the Uu and Un interfaces, with no clear method to match parameters and maintain service quality when the relay station transfers or generates packets.
Innovation Solution
A relay station equipped with a quality class identifying unit, mapping unit, and transmission unit to associate and transmit signals based on quality indicators, ensuring consistent QoS by mapping Uu-QCI to Un-QCI using a predetermined correspondence relationship, and setting appropriate quality indicators for signals generated by the relay station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate protocol stacks are used for Uu and Un interfaces, then communication flexibility and independence are improved, but parameter consistency and QoS matching between interfaces deteriorate
Solution Approach 1:
The patent introduces a correspondence relationship table as an intermediary mechanism that maps QCI values between Uu and Un interfaces. This table acts as a mediator that translates quality indicators from one interface protocol to another, enabling parameter consistency while maintaining separate protocol stacks. The mapping table stores predetermined correspondence relationships between QCI values of different protocol stacks, allowing the relay station to automatically select appropriate mappings based on the specific communication scenario.
Solution Approach 2:
The patent dynamically changes the QCI parameter values based on the interface being used. The relay station selects different QCI mappings from the correspondence relationship table depending on whether the communication is occurring on the Uu interface or the Un interface. This parameter transformation approach allows each interface to maintain its own protocol characteristics while ensuring that the quality of service semantics are preserved across the interface boundary through coordinated parameter changes.
2Area of stationary object
If the relay station transfers packets, then network coverage is extended, but QoS management complexity increases due to protocol stack differences
Solution Approach 1:
The patent establishes predetermined correspondence relationships between QCI values of different protocol stacks in advance and stores them in a mapping table. This preliminary configuration eliminates the need for complex real-time QoS management decisions during packet transfer. When the relay station receives a packet, it simply looks up the appropriate QCI mapping from the pre-configured table based on the source and destination interfaces, significantly reducing the management complexity while maintaining comprehensive QoS support across extended network coverage.
3Adaptability or versatility
If the relay station generates and transmits packets, then service functionality is enhanced, but service quality assurance becomes uncertain without clear parameter matching methods
Solution Approach 1:
The correspondence relationship table serves as an intermediary that provides deterministic QCI mapping for packets generated by the relay station. When the relay station generates a packet, it can consult the mapping table to select appropriate QCI values for both Uu and Un interfaces, ensuring that the service quality is properly assured from the moment of packet generation. This intermediary mechanism provides a systematic approach to QoS management for relay-generated traffic, enhancing service functionality with reliable quality assurance.
Data Source
AI summary
A relay station for relaying radio communication from a first communication station to a second communication station, including: a quality class identifying unit configured to identify a first quality indicator indicating a quality expected for the radio communication based on a received signal from the first communication station; a mapping unit configured to associate the received signal with a radio bearer having a quality indicated by a second quality indicator corresponding to the first quality indicator in a correspondence relationship between quality indicators in communication between the first communication station and the relay station, and quality indicators in communication between the relay station and the second communication station; and a transmission unit configured to transmit the received signal to the second communication station using the radio bearer.