Relay Node Broadcast Information Update via Dedicated Signaling
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Solution Overview
Problem
In conventional mobile communication systems, relay nodes cannot immediately receive broadcast information from radio base stations due to time-sharing requirements in subframes, leading to delays in information updates.
Innovation Solution
A mobile communication system where a radio base station and relay node are connected via a first interface, allowing the relay node to time-share transmission and reception periods, and the radio base station transmits broadcast information to the relay node via individual signaling, using specific scheduling signals and channels to ensure reliable information delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay node time-shares subframes for Un interface and Uu interface transmission and reception, then backward compatibility for mobile stations is guaranteed, but the relay node cannot immediately receive changed broadcast information from the radio base station
Solution Approach 1:
The patent segments broadcast information transmission into two separate paths: (1) general broadcast information transmitted via MBSFN subframes to mobile stations, and (2) relay node-specific broadcast information transmitted via dedicated downlink subframes. This segmentation allows the relay node to receive updated broadcast information directly from the donor eNB without waiting for MBSFN subframe opportunities, thereby resolving the time delay issue while maintaining backward compatibility for mobile stations.
Solution Approach 2:
The patent implements preliminary action by transmitting broadcast information to the relay node in advance through dedicated downlink subframes before the relay node needs to forward it to mobile stations. The donor eNB proactively sends updated system information, capability information, and other broadcast data to the relay node via individual signaling, ensuring the relay node has current information ready for immediate forwarding when needed.
2Adaptability or versatility
If the relay node uses MBSFN subframes for receiving downlink signals from the radio base station, then mobile station compatibility is maintained, but broadcast information cannot be received immediately when changed
Solution Approach 1:
The patent introduces an intermediary mechanism where the donor eNB directly transmits broadcast information to the relay node via dedicated downlink subframes and individual signaling. This intermediary path bypasses the limitation of MBSFN subframe timing, allowing rapid information delivery to the relay node while the relay node continues to use MBSFN subframes for mobile station communication, thus maintaining compatibility without sacrificing speed.
Solution Approach 2:
The patent implements dynamic subframe allocation where certain downlink subframes are dynamically designated for relay node-specific broadcast information transmission. The donor eNB can flexibly assign these subframes based on when broadcast information needs to be updated, allowing the system to adapt to changing information requirements while maintaining the MBSFN structure for mobile stations.
Data Source
AI summary
A mobile communication system according to the present invention is configured such that a relay node RN is configured to time-share a subframe for transmission and reception in a Un interface and a subframe for transmission and reception in a Uu interface, and a radio base station DeNB is configured to transmit SI, which is to be transmitted in a subordinate cell, to the relay node RN via individual signaling.