Terminal Device TDD-FDD Carrier Aggregation Delay Control
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Solution Overview
Problem
Carrier aggregation of TDD and FDD carriers in communication systems leads to increased processing delay, affecting communication efficiency.
Innovation Solution
A terminal device and method where the value of K PUSCH is specified based on the UL index, and a specific radio network temporary identifier (RNTI) is configured for at least one serving cell, allowing appropriate transmission power control by constituting downlink control information (DCI) format included in the PDCCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation of TDD and FDD carriers is performed, then communication capacity is improved, but processing delay is increased
Solution Approach 1:
The patent applies dynamics by making the uplink-downlink configuration flexible and adaptable. Specifically, the base station can dynamically adjust the UL/DL configuration for TDD carriers based on traffic conditions and system load, allowing the system to optimize between capacity and delay requirements in real-time. The configuration can be changed through reconfiguration messages sent to terminal devices, enabling the system to adapt its time-division pattern dynamically rather than being fixed.
Solution Approach 2:
The patent utilizes parameter changes by modifying the UL/DL configuration parameters of TDD carriers. The system can change parameters such as the number of uplink subframes, downlink subframes, and special subframes within the TDD carrier configuration. By adjusting these parameters, the system can optimize the balance between communication capacity (throughput) and processing delay, allowing flexible adaptation to different traffic conditions while maintaining carrier aggregation functionality.
2Adaptability or versatility
If TDD and FDD carriers are integrated, then spectrum utilization is improved, but communication reliability deteriorates due to processing delays
Solution Approach 1:
The patent applies segmentation by separating the configuration management of TDD and FDD carriers. The system independently configures and manages TDD carriers with flexible UL/DL patterns while maintaining FDD carriers with their traditional continuous uplink-downlink structure. This segmentation allows each carrier type to be optimized independently, preventing the processing delays in TDD from affecting FDD reliability, while still achieving improved spectrum utilization through carrier aggregation.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a configuration management module that coordinates between TDD and FDD carriers. This intermediary manages the interaction between the two carrier types, ensuring that processing delays in TDD carriers do not propagate to FDD carriers. The configuration module acts as a mediator that can adjust TDD-specific parameters without affecting FDD operation, thereby maintaining overall communication reliability while achieving versatile spectrum utilization.
Data Source
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AI summary
There is provided a terminal device (2) which communicates with a base station apparatus (1). In a case where a PDCCH for a serving cell of frame structure type 2 is monitored in a serving cell of frame structure type 1, a TPC command included in the PDCCH is received based on a predetermined value.