Terminal Device HARQ Transmission Subframe Configuration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current radio communication systems, particularly in LTE, lack a detailed description of the procedure for efficiently transmitting and receiving downlink data using Physical Downlink Shared Channel (PDSCH) between base stations and terminal apparatuses.
Innovation Solution
The implementation of a method that allows terminal apparatuses to efficiently transmit and receive downlink data by configuring multiple cells using cell aggregation or carrier aggregation, applying time division duplex (TDD) schemes, and utilizing specific physical channels and reference signals to manage subframes for effective data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple cells are configured using cell aggregation or carrier aggregation, then data transmission capacity is improved, but system complexity increases
Solution Approach 1:
The patent divides the data transmission system into multiple independent cells that can be aggregated. Each cell operates with its own subframe configuration and data transmission parameters, allowing the system to handle larger data volumes by combining multiple segmented cells while maintaining manageable complexity through modular organization
Solution Approach 2:
The patent creates a universal subframe configuration framework that can be applied across multiple aggregated cells. The base station and terminal apparatus use common procedures for determining subframe types and data transmission parameters, enabling the system to scale to multiple cells without proportionally increasing operational complexity
2Adaptability or versatility
If flexible subframes are used for traffic adaptation, then resource allocation efficiency is improved, but timing determination complexity increases
Solution Approach 1:
The patent implements dynamic subframe configuration where subframes can be flexibly assigned as uplink or downlink based on traffic conditions. The base station transmits indication information to dynamically adjust subframe directions, allowing the system to adapt to varying traffic patterns while maintaining clear timing relationships through standardized determination procedures
Solution Approach 2:
The patent establishes feedback mechanisms where the base station monitors traffic conditions and sends indication information to adjust subframe configurations. This feedback loop enables traffic adaptation by allowing the system to respond to changing conditions while maintaining deterministic timing through structured indication and response procedures
3Reliability
If HARQ timing is determined based on UL-DL configuration, then data transmission reliability is improved, but processing complexity increases
Solution Approach 1:
The patent uses UL-DL configuration parameters to systematically determine HARQ timing relationships. By changing and adjusting configuration parameters rather than using fixed timing, the system can optimize reliability for different traffic patterns while managing complexity through parameter-based control rather than complex logic
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In a terminal apparatus communicating with a base station apparatus, first information and second information are received and third information is received on a physical downlink control channel, and when the physical downlink control channel is detected and when downlink control information format 1A to which CRC parity bits scrambled by a C-RNTI are added is detected in a subframe indicated as a special subframe based on a UL-DL configuration provided in accordance with the first information and indicated as a downlink subframe based on a UL-DL configuration provided in accordance with the third information, a downlink subframe is assumed based on the UL-DL configuration provided in accordance with the third information in the subframe and a corresponding physical downlink shared channel is detected.