Adaptive eDRX Cell Search for Power Savings
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving power savings during high priority cell searches with extended discontinuous reception (eDRX), especially when the eDRX cycle length is longer than the measurement periodicity of high priority cells.
Innovation Solution
The implementation of a method where a user equipment (UE) receives system information indicating the total number of high priority carrier frequencies and an eDRX configuration specifying the eDRX cycle length, allowing the UE to perform measurements for high priority frequency layers based on a time period determined by the total number of high priority carrier frequencies and the eDRX cycle length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs measurements for high priority frequency layers with a fixed measurement periodicity, then the cell search reliability is maintained, but the power consumption increases due to frequent wake-ups during eDRX cycle
Solution Approach 1:
The patent applies dynamics by making the measurement periodicity adaptive rather than fixed. The UE dynamically adjusts the measurement periodicity based on the eDRX cycle length and the number of high priority carrier frequencies. When eDRX cycle length increases, the measurement periodicity is extended accordingly, allowing the UE to remain in sleep mode longer while maintaining reliable cell search through calculated wake-up intervals that balance reliability requirements with power savings.
Solution Approach 2:
The patent changes the parameter of measurement periodicity based on system conditions. Specifically, the measurement periodicity is calculated as a function of the eDRX cycle length and the number of high priority carrier frequencies. This parameter change allows the UE to extend the time between measurements when fewer high priority frequencies are present or when eDRX cycle length is longer, thereby reducing wake-up frequency and power consumption while maintaining adequate search reliability.
2Use of energy by moving object
If the UE extends the measurement periodicity to reduce wake-ups, then power savings are achieved, but the cell search reliability may deteriorate
Solution Approach 1:
The patent applies preliminary action by having the UE calculate and prepare the appropriate measurement periodicity in advance based on the eDRX cycle length and number of high priority carrier frequencies. This pre-calculation allows the UE to set up an optimized wake-up schedule before actually performing measurements, ensuring that reliability requirements are met from the start without unnecessary wake-ups. The UE proactively determines the correct periodicity rather than reacting to reliability needs after the fact.
3Measurement precision
If the UE performs measurements for all high priority carrier frequencies simultaneously, then the measurement completeness is improved, but the time required for measurements increases
Solution Approach 1:
The patent applies segmentation by dividing the measurement task across multiple time periods rather than concentrating all measurements simultaneously. The UE segments the measurement process into periodic intervals, where each interval focuses on specific carrier frequencies or measurement tasks. This segmentation allows the UE to complete measurements for all high priority carrier frequencies systematically over time, reducing the time required in each individual measurement cycle while maintaining measurement completeness.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive system information that indicates a total number of high priority carrier frequencies. The UE may receive an extended discontinuous reception (eDRX) configuration that indicates an eDRX cycle length. The UE may perform, during a high priority cell search with eDRX, measurements for high priority frequency layers in accordance with a time period, wherein the time period is based at least in part on the total number of high priority carrier frequencies and the eDRX cycle length. Numerous other aspects are described.