Source eNodeB Handover Control Using Pre-Measured Radio Quality
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Solution Overview
Problem
In mobile communication systems, particularly in LTE, the current handover process often results in suboptimal radio resource allocation and the 'ping-pong phenomenon' due to a lack of radio quality information between the Target eNodeB and the UE, leading to inefficient channel allocation and frequent handovers.
Innovation Solution
The method involves transmitting radio quality information from the mobile station to the radio base station as the handover source, which then shares this information with the radio base station as the handover target, allowing for accurate channel allocation and determining whether to accept a handover based on this information, thereby preventing the ping-pong phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the Target eNodeB allocates channels without receiving radio quality information from the Source eNodeB, then the handover process is simpler and faster, but the channel allocation correctness deteriorates and ping-pong phenomenon occurs
Solution Approach 1:
The Source eNodeB performs preliminary action by measuring and storing radio quality information (RSCP and RQI) before handover occurs. When handover is triggered, this pre-measured information is immediately transferred to the Target eNodeB, enabling accurate channel allocation without delaying the handover process. This resolves the contradiction by preparing data in advance rather than requiring real-time measurement at the target side.
Solution Approach 2:
The Source eNodeB acts as an intermediary that bridges the measurement gap between UE and Target eNodeB. It measures the radio quality of the target cell on behalf of the Target eNodeB and transfers this information during handover preparation. This intermediary role eliminates the need for Target eNodeB to perform independent real-time measurements, maintaining handover speed while ensuring allocation accuracy.
2Reliability
If the mobile station measures and reports radio quality information to the source base station, then the source base station can make informed handover decisions, but the system complexity increases due to additional measurement and reporting mechanisms
Solution Approach 1:
The invention leverages the existing universal measurement capability of the UE, which is already designed to measure radio quality for handover purposes. The same measurement results are reused for both Source eNodeB decision-making and Target eNodeB channel allocation, eliminating the need for separate measurement systems. This multi-use approach maintains reliability while avoiding additional complexity.
Solution Approach 2:
The UE performs self-service by autonomously measuring radio quality parameters (RSCP and RQI) and reporting them to the network. This self-measured information is then utilized by both Source and Target eNodeBs, reducing the need for network-side measurement infrastructure and simplifying the overall system architecture while maintaining high decision accuracy.
3Productivity
If the source base station transfers radio quality information to the target base station before handover, then optimal channel allocation is achieved, but the information transfer overhead increases
Solution Approach 1:
The invention extracts only the essential radio quality parameters (RSCP and RQI) needed for channel allocation from the comprehensive measurement data. By selecting and transferring only these critical parameters rather than all available measurement information, the system achieves optimal resource allocation while minimizing information transfer overhead. This extraction principle filters out unnecessary data while preserving allocation-critical information.
Solution Approach 2:
The invention changes the parameter representation by using compact, standardized measurements (RSCP for signal strength and RQI for quality) that convey maximum information with minimum bits. These parameter transformations enable efficient encoding and transmission of radio quality information, improving allocation efficiency while reducing the overhead burden on the handover signaling channel.
Data Source
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AI summary
The present application relates to a radio base station as a handover source in a mobile communication system, and to a handover control method for a radio base station as a handover source, wherein a measurement report message is received from a mobile station wherein the measurement report message includes information on a received power of a reference signal between the mobile station and a radio base station as the handover target which is measured by the mobile station; it is decided whether the mobile station is to be handed over from the radio base station as the handover source to the radio base station as the handover target, based on the measurement report message from the mobile station, and context information necessary for communication with the mobile station is transmitted to the radio base station as the handover target after the decision that the mobile station is to be handed over from the radio base station as the handover source to the radio base station as the handover target, wherein the context information includes the information on the received power of a reference signal.