Mobile Communication System Relay Node Bearer Configuration
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Solution Overview
Problem
Conventional mobile communication systems fail to effectively configure bearer channels and protocol stacks for sending control signals when relay nodes are employed, as they do not allow control signals to be sent and received via multiple devices with the functions of a radio base station.
Innovation Solution
A mobile communication system is configured to send and receive control signals between a mobile station and a mobile switching center via a first radio bearer set between the mobile station and a relay node, a second radio bearer set between the relay node and a radio base station, and a wired bearer set between the radio base station and the mobile switching center, utilizing specific layer functions at each node for signal processing and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If relay nodes are employed in LTE-Advanced scheme, then communication coverage and capacity are improved, but the bearer configuration and protocol stack for control signals cannot be applied because there is no intention for mobile station to send and receive control signals via multiple devices
Solution Approach 1:
The patent segments the control signal transmission path by introducing separate signaling radio bearers (SRB0, SRB1, SRB2) for different control purposes, and divides the protocol stack into distinct layers (RRC, PDCP, RLC, MAC, PHY) with specific functions at each layer. This segmentation allows relay nodes to be integrated without requiring complete redesign of the entire control signal mechanism.
Solution Approach 2:
The patent introduces relay nodes as intermediary devices between the mobile station and the radio base station. The relay node contains protocol stack functions (RRC, PDCP, RLC, MAC, PHY) that enable it to forward control signals while maintaining the existing bearer configuration structure. This intermediary approach allows control signals to traverse multiple devices without fundamentally changing the protocol architecture.
2Adaptability or versatility
If control signals are sent via multiple devices including relay nodes, then communication flexibility is improved, but session management and security processing become more complex
Solution Approach 1:
The patent implements universal session management mechanisms where the RRC layer handles session establishment, maintenance, and release across both direct and relayed connections. The SCTP layer provides universal session keep-alive functionality, and the IP layer with IPSec provides unified security processing. These multi-functional layers manage diverse communication paths without requiring separate mechanisms for each path type.
Solution Approach 2:
The patent incorporates feedback mechanisms through session keep-alive procedures where the mobile station and network exchange signaling to confirm active sessions. The protocol stack includes acknowledgment and status reporting functions that provide continuous feedback on session state, enabling reliable session management across multiple devices with relay nodes.
Data Source
AI summary
A radio base station includes a mobile communication system that sends and receives control signals between a mobile station and a mobile switching center via a first radio bearer, a second radio bearer, and a wired bearer. The relay node includes a first radio bearer function, a second radio bearer function, an IP layer function, an SCTP layer function, and an application layer function. The radio base station includes a second radio bearer function, a wired bearer function, and an IP layer function. The mobile switching center includes a wired bearer function, IP layer function, SCTP layer function, and an application layer function. Keep-alive processing is performed between the SCTP layer function of the relay node and the SCTP layer function of the mobile switching center. Security processing is performed between the IP layer function of the relay node and the IP layer function of the mobile switching center.