Downlink Control Channel Decoding via PRB Bundling
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Solution Overview
Problem
In wireless communication systems, existing methods face challenges in efficiently receiving downlink control channels, particularly in managing different transmission time intervals (TTIs) and power efficiency, which affects latency and data transmission reliability.
Innovation Solution
A method that allows terminals to decode downlink control channels by receiving information on PRB bundling, using terminal-specific reference signals, and adjusting TTI lengths, while applying the same precoder across PRB bundles, enabling efficient data transmission and reception across various TTI lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRB bundling is configured for downlink control channels, then decoding reliability is improved through same precoder application, but system complexity increases due to multiple TTI length management
Solution Approach 1:
The patent applies parameter changes by configuring PRB bundling size and TTI length as adjustable parameters. The base station can dynamically set the PRB bundling size (e.g., 2, 4, or 8 PRBs) and TTI length (e.g., 1ms, 2ms, or 4ms) to optimize between decoding reliability and system complexity based on channel conditions and service requirements.
Solution Approach 2:
The patent implements dynamics by enabling flexible TTI length adaptation and PRB bundling configuration. The system can dynamically switch between different TTI lengths (short TTI for low latency, long TTI for power efficiency) and adjust PRB bundling size according to varying channel conditions and traffic patterns, resolving the contradiction between reliability and complexity.
2Speed
If short TTI is used for latency-sensitive services, then transmission speed is improved, but power efficiency deteriorates due to increased transmission frequency
Solution Approach 1:
The patent applies dynamics by enabling flexible TTI length adaptation. The system can dynamically switch between short TTI (e.g., 0.5ms or 1ms) for latency-sensitive services requiring high transmission speed, and long TTI (e.g., 2ms or 4ms) for power-efficient transmission of bulk data, allowing optimal balance between speed and power efficiency based on service requirements.
Solution Approach 2:
The patent uses parameter changes by adjusting TTI length as a controllable parameter. The base station can configure different TTI lengths (e.g., 1ms, 2ms, 4ms) based on service type, allowing short TTI for latency-sensitive traffic to improve transmission speed while using long TTI for other traffic to maintain power efficiency.
3Use of energy by moving object
If long TTI is used for power-efficient transmission, then energy consumption is reduced, but latency increases
Solution Approach 1:
The patent implements dynamics through flexible TTI length adaptation, allowing the system to switch between long TTI (e.g., 2ms or 4ms) for power-efficient bulk data transmission and short TTI (e.g., 0.5ms or 1ms) for latency-sensitive services, thereby resolving the contradiction between energy consumption and latency based on real-time service requirements.
Solution Approach 2:
The patent applies parameter changes by configuring TTI length as an adjustable parameter. The base station can set long TTI (e.g., 2ms, 4ms) for power-efficient transmission scenarios and short TTI (e.g., 0.5ms, 1ms) for latency-critical services, optimizing the balance between energy consumption and latency according to service type and channel conditions.
4Use of energy by moving object
If terminal-specific reference signals are reused across TTIs, then power efficiency is improved, but measurement precision deteriorates due to channel variations
Solution Approach 1:
The patent applies parameter changes by adjusting the TTI window size and reference signal update frequency. The base station can configure a TTI window (e.g., spanning 1, 2, or 4 TTIs) within which terminal-specific reference signals are reused, balancing power efficiency with channel variation tolerance to maintain adequate measurement precision.
Data Source
AI summary
According to one embodiment of the present invention, a method by which a terminal decodes a downlink control channel for a terminal configured so as to support a multi transmission time interval (TTI) length in a wireless communication system can comprise the steps of: receiving information on whether physical resource block (PRB) bundling occurs for a downlink control channel or on bundling size thereof; and decoding downlink control channels at a first TTI on the basis of the assumption that the same precoder has been applied to downlink control channels within the same PRB bundling, when the PRB bundling is configured for the downlink control channel.