Dynamic TDD Configuration for LTE Resource Allocation
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Solution Overview
Problem
Current LTE communication systems face inefficiencies in managing uplink and downlink resources, particularly in time division duplex (TDD) schemes, which affect communication efficiency between user equipment and base stations.
Innovation Solution
The implementation of a radio communication system that employs cell aggregation, dynamic TDD configurations, and flexible subframe allocation, allowing for efficient allocation of uplink and downlink resources through specific UL-DL configurations and reference configurations, enabling flexible scheduling of physical channels and signals across multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD configuration is implemented to adapt traffic patterns, then resource allocation efficiency is improved, but system complexity increases due to multiple UL-DL configurations and reference configurations
Solution Approach 1:
The patent implements dynamic TDD configuration by allowing the UL-DL configuration to change over time based on traffic conditions. The system transitions from static configuration to dynamic reconfiguration, enabling adaptive resource allocation between uplink and downlink directions to match varying traffic patterns while maintaining manageable complexity through standardized procedures
Solution Approach 2:
The patent changes the parameter of UL-DL configuration dynamically by introducing multiple configuration options (Configuration 0-6) and allowing switching between them based on traffic conditions. This parameter change enables the system to adapt resource allocation efficiency without requiring fundamental architectural changes
2Productivity
If flexible subframe allocation is used to optimize resource distribution, then communication efficiency is improved, but scheduling complexity increases due to multiple reference configurations
Solution Approach 1:
The patent segments the subframe allocation by introducing separate UL reference UL-DL configuration and DL reference UL-DL configuration. This segmentation allows independent optimization of uplink and downlink scheduling while reducing the complexity of managing all subframes uniformly, as each direction can be configured according to its specific traffic requirements
Solution Approach 2:
The patent creates universal reference configurations that can be applied across multiple cells in a carrier aggregation scenario. The UL reference and DL reference configurations serve multiple purposes: determining HARQ timing, PUSCH/PDSCH scheduling, and uplink-downlink assignment, thereby reducing overall scheduling complexity through multi-functional standardized procedures
3Adaptability or versatility
If cell aggregation with multiple UL-DL configurations is implemented, then resource flexibility is improved, but timing synchronization becomes more difficult across cells
Solution Approach 1:
The patent introduces reference configurations as intermediary elements that mediate timing relationships between cells with different UL-DL configurations. The UL reference UL-DL configuration and DL reference UL-DL configuration serve as common reference points that enable synchronized HARQ timing and resource allocation across aggregated cells, even when the cells have different actual UL-DL configurations
Data Source
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AI summary
There is provided user equipment that includes a reception unit. The reception unit receives first information indicating a radio network temporary identifier (RNTI), second information, plural pieces of third information, and fourth information. The second information indicates a subframe in which the user equipment monitors a physical downlink control channel with the RNTI. Each of the plural pieces of third information indicates an uplink-downlink configuration which is transmitted on the physical downlink control channel with the RNTI. The fourth information is used for determining an index of third information for a serving cell among the plural pieces of third information. In a case where the fourth information is configured for any of activated serving cells, the reception unit monitors the physical downlink control channel with the RNTI, in a common search space for a primary cell, in the subframe for monitoring the physical downlink control channel with the RNTI.