Terminal Device Transmission Power Control Timing
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Solution Overview
Problem
There is a lack of specific procedures for efficiently performing transmission power processing in wireless communication systems, particularly for transmission power control in LTE systems, which affects the efficient management of uplink and downlink resources.
Innovation Solution
A terminal device and base station device that utilize a reception unit to receive downlink control information format, with a transmission power control unit that applies transmission power control commands based on specific uplink-downlink configurations indicated by scrambled cyclic redundancy check parity bits and radio network temporary identifiers, allowing for efficient power control management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If transmission power control commands are transmitted using downlink control information format 3 with CRC scrambled by RNTI, then power control management can be achieved, but specific procedures for efficient processing are not disclosed
Solution Approach 1:
The patent segments the transmission power control procedure into distinct steps: receiving DCI format 3 with TPC commands, determining application timing based on UL-DL configuration, and applying power control at the appropriate uplink subframe. This segmentation provides the previously missing specific procedures for efficient processing.
Solution Approach 2:
The patent establishes preliminary rules for determining application timing of TPC commands based on UL-DL configuration before actual power control execution. By pre-defining the timing relationship between downlink TPC commands and uplink power application, the system enables efficient processing without requiring complex real-time decisions.
2Productivity
If dynamic TDD configuration is used to adapt to traffic conditions, then resource allocation efficiency is improved, but complexity of power control timing determination increases
Solution Approach 1:
The patent uses parameter changes by introducing UL-DL configuration as a key parameter that determines TPC command application timing. By linking timing determination to the configured UL-DL pattern rather than fixed timing, the system adapts to dynamic TDD while maintaining manageable complexity through parameter-based control.
Solution Approach 2:
The patent implements dynamics by making TPC application timing adaptive to the configured UL-DL pattern. Instead of fixed timing, the system dynamically determines when to apply power control commands based on the current uplink-downlink configuration, enabling efficient resource allocation while maintaining clear procedural rules.
3Object-affected harmful factors
If TPC commands are applied based on UL-DL configuration, then interference management is optimized, but processing complexity for timing determination increases
Solution Approach 1:
The patent implements feedback by using the UL-DL configuration (which reflects actual traffic and interference conditions) to determine TPC application timing. This creates a feedback loop where the system adapts power control timing to current network conditions, optimizing interference management while keeping processing complexity manageable through configuration-based rules.
Data Source
AI summary
A terminal device controls transmission power using a TPC command that is included in a DCI format 3. In the terminal device, in a case where CRC parity bits that are attached to the DCI format 3 are scrambled with a first RNTI, timing when the TPC command is applied is based on a first uplink-downlink configuration, and in a case where the CRC parity bits that are attached to the DCI format 3 are scrambled with a second RNTI, timing when the TPC command is applied is based on a second uplink-downlink configuration.