LTE Relay Handover Optimization via Cell Status-Aware Measurement
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Solution Overview
Problem
In LTE-Advanced systems with inband relays, existing cell selection and handover procedures are inadequate due to interference issues and limitations in mapping RSRP/RSRQ measurements to data rates, leading to suboptimal connections and reduced throughput.
Innovation Solution
The implementation of a system that includes a user equipment with a receiver, power meter, and measurement controller to receive measurement configuration orders, measure reference signal received powers, and transmit reports, while a Node B processes cell status information to create measurement configuration orders and perform handover operations based on whether neighboring cells are of a different type, optimizing cell selection and handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If RSRP and RSRQ measurements are used for cell selection in systems with inband relays, then the measurement process is simple and consistent with existing procedures, but the measurements cannot be directly mapped to expected data rates leading to suboptimal cell selection
Solution Approach 1:
The patent introduces new measurement parameters (backhaul link quality indicators, relay-specific measurement quantities) alongside existing RSRP/RSRQ measurements. This allows the system to maintain simple measurement procedures while adding parameters that accurately reflect the end-to-end data rate potential through relay nodes, resolving the contradiction between measurement simplicity and prediction accuracy.
Solution Approach 2:
The patent introduces intermediary measurement parameters that capture the quality of the backhaul link between relay and donor eNB. These intermediary measurements serve as a bridge between the simple RSRP/RSRQ measurements and the complex end-to-end data rate prediction, enabling accurate cell selection without complicating the basic measurement process.
2Adaptability or versatility
If existing handover algorithms are used in relay-based deployments, then the system maintains compatibility with standard procedures, but the algorithms are insufficient for optimized cell selection in relay scenarios
Solution Approach 1:
The patent segments the handover decision process into separate evaluation stages: one for direct eNB connections using existing algorithms, and another for relay connections using new relay-aware measurement parameters. This segmentation allows the system to maintain compatibility with standard procedures for direct connections while implementing optimized algorithms for relay scenarios, thereby improving overall system throughput.
Solution Approach 2:
The patent implements dynamic handover algorithms that adaptively select between different measurement and decision-making approaches based on the current cell type (direct eNB or relay). The system dynamically adjusts which parameters are used for handover decisions, enabling optimized cell selection for relay scenarios while maintaining standard procedure compatibility, thus improving productivity without sacrificing adaptability.
Data Source
AI summary
A method for power measurements in a cellular communication system comprises receiving measurement configuration orders. Operation of a power meter is controlled in dependence on the measurement configuration orders. Reference signal received powers are measured. A measurement report is compiled and transmitted. The measurement configuration orders comprise cell status information associated with neighboring cells and measurement instructions that are dependent of the cell status of respective cell. The cell status information comprises information about whether the neighboring cell is of a different type than the serving cell. Controlling of the operation of the power meter and/or compiling of the measurement report is performed in dependence on the cell status of the neighboring cell. A method for handover based on such measurement reports is also disclosed as well as Node Bs and user equipments configured to perform such methods.