eNodeB Uplink Downlink Ratio Configuration via PDCCH Signaling
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Solution Overview
Problem
Current 3GPP LTE-Advanced systems do not support flexible adjustment of uplink and downlink ratio configurations in eNodeBs, leading to suboptimal performance when uplink and downlink transmission loads are mismatched with the predefined configurations.
Innovation Solution
Implementing a dynamic or semi-static adjustment mechanism where eNodeBs can change uplink-downlink ratio configurations based on traffic patterns by using a special PDCCH with a DU-RNTI, allowing for flexible configuration updates within predetermined time periods, monitoring periods, or adjustment periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If eNodeBs use predefined uplink-downlink configurations, then system stability and simplicity are maintained, but adaptability to varying traffic patterns deteriorates
Solution Approach 1:
The patent implements dynamic uplink-downlink configuration adjustment by enabling eNodeBs to change their UL/DL configurations based on real-time traffic patterns and by coordinating with neighboring eNodeBs through X2 interface signaling. This transforms the static, predefined configuration system into a dynamic one that adapts to varying traffic demands while maintaining network-wide consistency.
2Adaptability or versatility
If eNodeBs dynamically adjust uplink-downlink configurations, then adaptability to traffic demands improves, but control channel detection reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by providing advance notification to user equipment about upcoming configuration changes through dedicated PDCCH signaling. The network signals the upcoming UL/DL configuration and the time at which it will become effective, allowing UEs to prepare for the change in advance. This prevents detection reliability issues by ensuring UEs are aware of configuration changes before they occur.
Solution Approach 2:
The patent implements feedback mechanisms where eNodeBs monitor traffic patterns and configuration effectiveness, then use this information to make informed configuration adjustment decisions. The system continuously adapts based on feedback from the network state and traffic conditions while maintaining coordination with neighboring eNodeBs to ensure reliable operation.
3Productivity
If eNodeBs frequently update configurations, then traffic pattern matching improves, but system stability and latency deteriorate
Solution Approach 1:
The patent implements periodic action by establishing monitoring periods and adjustment periods for configuration changes. eNodeBs monitor traffic patterns over defined periods and adjust configurations at predetermined intervals rather than continuously. This periodic approach balances the need for adaptability with the requirement for system stability, preventing excessive configuration changes that would cause latency and instability.
Data Source
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AI summary
An apparatus of an enhanced Node B, the apparatus comprising: a memory; and processing circuit comprising: means for decoding an overload indication and a first uplink/downlink (UL/DL) configuration received from a neighboring eNB; means for adapting a second UL/DL configuration for at least one user equipment (UE) responsive to the received overload indication and first UL/DL configuration; means for encoding the adapted second UL/DL configuration in downlink control information (DCI) of a physical downlink control channel (PDCCH); meas for masking a cyclic redundancy check (CRC) for the PDCCH with a radio network temporary identifier (RNTI) reserved for signaling UL/DL configurations; a means for encoding the PDCCH for transmission to the at least one UE; wherein the memory is configured to store the adapted second UL/DL configuration.