Terminal Cross-Cell Resource Triggering for Low-Overhead NR Measurements
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Solution Overview
Problem
Current NR technical specifications are not optimized for discontinuous transmission and reception in a short period of time, leading to high time overhead and inefficient frequency utilization, particularly in high frequency bands, which increases power consumption and activation delays.
Innovation Solution
A terminal and base station configuration that allows for the triggering of channel state information reference signals, tracking reference signals, and sounding reference signals without explicit indication in control information, enabling low time overhead and efficient frequency utilization by allowing the terminal to perform only radio resource management measurements when not actively transmitting or receiving data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If channel mapping and operations are optimized for continuous transmission in current NR technical specifications, then system stability is maintained, but time overhead increases and frequency utilization efficiency deteriorates during discontinuous transmission/reception
Solution Approach 1:
The patent applies dynamics by making the terminal's operation mode adaptable - switching between continuous monitoring mode and selective triggering mode based on whether data transmission/reception is active. This dynamic adjustment allows the system to optimize between stability and efficiency depending on the operational state, reducing time overhead during discontinuous operations while maintaining system stability.
Solution Approach 2:
The patent changes the operational parameters of reference signal measurements by transitioning from periodic measurements to event-triggered measurements. When data transmission/reception occurs, the terminal triggers CSI-RS, TRS, SRS, or PRACH measurements; otherwise, it performs only RRM measurements. This parameter change reduces the frequency and quantity of measurements, thereby reducing time overhead and improving frequency utilization efficiency.
2Measurement precision
If the terminal performs frequent channel measurements and reference signal transmissions, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by performing only the necessary measurements based on operational needs. Instead of continuously performing all types of measurements (CSI-RS, TRS, SRS, PRACH), the terminal performs only RRM measurements during discontinuous periods and triggers specific measurements only when data transmission/reception occurs. This partial action maintains measurement precision when needed while significantly reducing power consumption during idle periods.
3Reliability
If the terminal activates all measurement functions for high frequency band usage, then reliability is improved, but activation delay increases
Solution Approach 1:
The patent applies preliminary action by maintaining the terminal in a ready state with basic RRM measurement capabilities during discontinuous periods, rather than fully activating all measurement functions. When data transmission/reception is detected, the terminal can quickly trigger the necessary channel measurements and reference signals. This preliminary preparation reduces activation delay while maintaining reliability, as the essential measurement infrastructure is already in place but not fully activated until needed.
4Reliability
If the terminal continuously monitors and performs measurements, then system reliability is maintained, but frequency utilization efficiency deteriorates
Solution Approach 1:
The patent applies periodic action by structuring measurements around data transmission/reception events rather than continuous monitoring. The terminal performs RRM measurements periodically during discontinuous periods and triggers channel-specific measurements (CSI-RS, TRS, SRS, PRACH) periodically when data activity is detected. This event-driven periodic approach maintains system reliability by ensuring measurements occur at appropriate intervals while improving frequency utilization efficiency by avoiding unnecessary continuous monitoring.
Data Source
AI summary
A terminal includes a receiving unit that receives control information transmitted on a second cell, the control information including information used to assign a resource for a downlink shared channel reception or a resource for an uplink shared channel transmission in a first cell; and a control unit that determines at least one of a measurement of a channel state information reference signal (CSI-RS), a measurement of a tracking reference signal (TRS), a transmission of a sounding reference signal (SRS), or a transmission of a physical random access channel (PRACH) is triggered, regardless of a content of information other than the information used to assign the resource included in the control information.