Base Station Subframe Allocation via UL-DL Segmentation
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Solution Overview
Problem
The existing resource allocation methods in LTE-Advanced systems for mobile stations with Single Rx/Tx capability supporting dual connectivity are inflexible, particularly due to consecutive UL subframes being allocated to the same eNB, leading to inefficient subframe assignment.
Innovation Solution
The proposed solution involves breaking down UL-DL configurations into DL/Sp/UL sets, allowing for flexible allocation of subframes to base stations in set units, correlating downlink subframes with uplink subframes and special subframes to improve resource utilization and switching efficiency between MeNB and SeNB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If consecutive UL subframes are allocated to the same eNB, then resource allocation is simplified, but flexibility in resource allocation deteriorates
Solution Approach 1:
The patent segments the UL-DL configuration into multiple sets, where each set contains specific downlink subframes and uplink subframes. This segmentation allows different sets to be allocated to different eNBs (MeNB and SeNB), enabling flexible resource allocation while maintaining manageable complexity through structured organization of subframe assignments.
2Reliability
If subframes are allocated in set units with correlations, then communication integrity is maintained, but resource allocation flexibility is reduced
Solution Approach 1:
The configuration is divided into multiple sets, each containing correlated downlink and uplink subframes. This segmentation maintains communication integrity within each set while allowing flexible assignment of different sets to different eNBs, thus resolving the contradiction between reliability and flexibility.
Solution Approach 2:
The patent enables dynamic selection and assignment of different sets to MeNB and SeNB based on communication conditions and requirements. This dynamic approach allows the system to adapt resource allocation while maintaining the internal correlations within each set, achieving both reliability and flexibility.
3Adaptability or versatility
If multiple UL subframes are assigned to different base stations, then resource allocation flexibility is improved, but risk of communication errors during switching increases
Solution Approach 1:
By segmenting the configuration into sets with clearly defined downlink and uplink subframe correlations, the patent ensures that switching between eNBs occurs at well-defined boundaries. This reduces the risk of communication errors during switching while maintaining the flexibility to assign different sets to different base stations.
Data Source
AI summary
Base stations in a system where a mobile station communicates with one of multiple base stations at each subframe using one of multiple UL-DL configurations include: a signal assigner and a separator. The signal assigner assigns signals to be transmitted to the mobile station, based on assignment information, the assignment information indicating assignment of subframes included in a UL-DL configuration that is configured to the mobile station, for each of the multiple base stations. Multiple subframes included in a UL-DL configuration are assigned to each of the multiple base station devices, for each DL/Sp/UL set made up of subframes correlated by a UL grant-PUSCH timing and a DL assignment(PDSCH)-HARQ ACK timing.