Uplink Power Control Timing Adjustment for 5G Latency Reduction
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Solution Overview
Problem
In wireless communication systems, particularly in latency reduction modes, there is a challenge in efficiently managing power control for uplink transmission signals to prevent signal collisions and ensure timely data transmission across heterogeneous services like eMBB, URLLC, and mMTC, which require different latency and reliability standards.
Innovation Solution
A method and apparatus for power control in user equipment (UE) and base stations that adjust transmission timing to prevent signal collisions by configuring terminals in latency reduction modes, allowing for efficient coexistence of heterogeneous services by modifying the timing of HARQ-ACK and PUSCH transmissions based on search spaces and DCI formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If latency reduction mode is configured for terminals, then transmission speed and responsiveness are improved, but signal collision risk increases due to adjusted timing of HARQ-ACK and PUSCH transmissions
Solution Approach 1:
The patent implements dynamic timing adjustment for HARQ-ACK and PUSCH transmissions based on the configured latency reduction mode. The terminal adapts its transmission timing dynamically by applying different timing offsets (e.g., k1 values from a configured set) depending on the DCI format and search space, allowing the system to optimize for low latency while managing collision risks through adaptive timing selection rather than fixed timing.
Solution Approach 2:
The patent changes the timing parameter (k1 offset) based on the latency reduction mode configuration. The network configures a set of k1 values and the terminal selects appropriate values based on the DCI format (fallback vs. non-fallback) and search space (common vs. UE-specific), effectively using parameter variation to resolve the contradiction between speed improvement and collision prevention.
2Loss of time
If timing adjustment is applied for latency reduction, then transmission latency is reduced, but complexity of power control management increases due to heterogeneous service requirements
Solution Approach 1:
The patent segments the power control management by separating handling of different service types (eMBB, URLLC, mMTC) and different DCI formats (fallback, non-fallback). The terminal applies different timing adjustments and power control procedures based on the service type and DCI format detected in specific search spaces, dividing the complex power control task into manageable segments rather than using a unified approach.
Solution Approach 2:
The patent applies local quality by configuring different timing offsets and power control parameters for different search spaces and DCI formats. The terminal uses specific k1 values from the configured set depending on whether it detects DCI in common search space or UE-specific search space, and whether it's fallback or non-fallback format, tailoring the power control behavior to local conditions rather than using uniform parameters globally.
3Adaptability or versatility
If heterogeneous services (eMBB, URLLC, mMTC) are supported simultaneously, then service versatility is improved, but difficulty in managing power control timing increases
Solution Approach 1:
The patent implements a universal power control mechanism that handles multiple service types (eMBB, URLLC, mMTC) through a unified framework. The network configures a set of k1 values that can be applied across different service types, and the terminal uses the same basic procedure of detecting DCI format and search space to determine timing adjustment, making the power control system multi-functional rather than requiring separate mechanisms for each service.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the set of k1 values through higher-layer signaling before actual data transmission. The terminal receives and stores the configured k1 values in advance, so when latency reduction mode is activated and DCI is received, the terminal can immediately select the appropriate pre-configured timing offset without complex real-time calculations, simplifying the detection and measurement process for heterogeneous services.
Data Source
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AI summary
This disclosure relates to a communication technique and a system thereof that fuses a 5G communication system with IoT technology so as to support higher data transmission rates than 4G systems. This disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, services related to healthcare, digital education, retail, security, and safety, or the like) on the basis of 5G communication technology and IoT related technology. The present invention relates to a wireless communication system, and relates to a method and an apparatus that control the power of an uplink transmission signal. More specifically, disclosed is a method in which power in uplink transmission is controlled by a terminal that has received delay reduction mode settings.