Handover Initiation Using TDD Offset and Power Compensation
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Solution Overview
Problem
In wireless communication systems with dynamic Time Division Duplex (TDD) reconfiguration, existing handover methods fail to consider the TDD configuration difference and uplink-downlink traffic model of wireless devices, leading to performance degradation in UL or DL transmission after handover.
Innovation Solution
A method and device that calculate a power offset and a TDD offset based on the receiving power difference and TDD configuration difference between source and target base stations, considering the uplink-downlink traffic model, to determine when to initiate a handover by combining these offsets exceeding a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover decision is made based only on radio quality metrics (RSRP/RSRQ), then the handover procedure is simple and fast, but the wireless device experiences transmission performance degradation when TDD configuration differs between source and target cells
Solution Approach 1:
The patent modifies the handover decision parameters by introducing TDD configuration difference as a new parameter and calculating a compensated power offset that incorporates both radio quality metrics and TDD configuration differences. This allows the system to maintain simple handover execution while improving reliability by considering multiple factors in the decision-making process.
Solution Approach 2:
The patent introduces a compensated power offset as an intermediary parameter that mediates between the raw radio quality metrics and the final handover decision. This intermediary combines the power offset calculation with TDD configuration difference information, allowing the system to handle complex TDD scenarios without complicating the overall handover procedure.
2Adaptability or versatility
If dynamic TDD reconfiguration is implemented to adapt to traffic requirements, then the system can optimize resource allocation for different traffic patterns, but handover decisions become more difficult to make when source and target cells have different TDD configurations
Solution Approach 1:
The patent implements a feedback mechanism where the wireless device reports its traffic model information (uplink-downlink traffic ratio) to the network side. This feedback allows the system to use the reported traffic characteristics to calculate appropriate TDD offsets and make informed handover decisions, thereby reducing the difficulty of detecting suitable target cells with different TDD configurations.
Solution Approach 2:
The patent performs preliminary calculation of the TDD offset and compensated power offset before making the handover decision. By pre-calculating these values based on the reported traffic model and measured radio quality metrics, the system prepares all necessary information in advance, making the actual handover decision process simpler and more straightforward even when TDD configurations differ significantly.
Data Source
AI summary
The present disclosure provides a method in a wireless device for initiating a handover from a source base station to a target base station. The method includes calculating a power offset indicative of a difference between a receiving power from the target base station and a receiving power from the source base station. A Time Division Duplex (TDD) configuration difference is obtained between a TDD configuration of the target base station and a TDD configuration of the source base station. A TDD offset is calculated based on the TDD configuration difference and an uplink-downlink traffic model of the wireless device. The handover is initiated based on a combination of the power offset and the TDD offset exceeding a threshold. The present disclosure also provides a wireless device, a method in a base station and a base station.