Beam Scheduling Method for Uplink MPE Constraint Management
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Solution Overview
Problem
The limitation on Maximum Permissible Exposure (MPE) in uplink communication systems leads to reduced uplink transmission power, causing performance degradation and potential failure due to the need to reduce transmission power when beams selected based on downlink Reference Signal Received Power (RSRP) are used for uplink transmission.
Innovation Solution
A beam scheduling method that sends indication information to terminals to measure Reference Signal Received Power (RSRP) considering the uplink MPE limitation, allowing for dynamic or semi-static consideration of MPE influence, and reports measurement results to perform flexible beam scheduling, using high-layer or physical layer signaling, and differential reporting to differentiate between MPE-affected and unaffected measurement values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam selection is based on maximization of downlink RSRP, then downlink performance is improved, but uplink transmission power is reduced due to MPE limitation
Solution Approach 1:
The patent implements dynamic beam measurement and reporting mechanisms where the terminal can switch between measuring RSRP with and without MPE consideration based on network configuration. The network can dynamically adjust the measurement configuration through RRC signaling or MAC CE commands, allowing the system to adapt beam selection criteria according to whether uplink power is constrained by MPE limitations.
Solution Approach 2:
The patent changes the measurement parameter by introducing two distinct RSRP measurement modes: one that considers MPE limitations and one that does not. The terminal can be configured to report different measurement results (with or without MPE backoff) allowing the network to select appropriate beams based on the current operational requirements, effectively changing the measurement parameter to resolve the contradiction.
2Object-affected harmful factors
If transmission power is reduced to meet MPE limitation, then safety compliance is improved, but uplink transmission performance is degraded
Solution Approach 1:
The patent applies preliminary action by having the terminal pre-calculate and report RSRP measurements that account for MPE limitations before actual uplink transmission occurs. The network receives these pre-computed measurements and uses them for beam selection, ensuring that beams suitable for uplink transmission under MPE constraints are identified in advance, thus maintaining both safety compliance and transmission performance.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal reports measurement results including MPE-related information to the network. The network uses this feedback to make informed beam selection decisions that balance MPE compliance with uplink performance requirements, creating a closed-loop system that continuously optimizes the trade-off between safety and performance.
3Reliability
If flexible beam scheduling is implemented considering MPE, then uplink performance is improved, but system complexity increases
Solution Approach 1:
The patent segments the beam measurement and reporting process into distinct configurations: one for measurements considering MPE and one for measurements not considering MPE. The network can independently configure and activate different measurement configurations through RRC signaling or MAC CE commands, allowing flexible beam scheduling without requiring complete redesign of the entire measurement system, thus managing complexity through segmentation.
Data Source
AI summary
A beam scheduling method, including: when determining that a terminal has a specified capability, sending indication information to the terminal, the indication information being used to indicate whether the terminal measures RSRP on the basis of the restriction of an uplink MPE, and the specified capability being used to express that the terminal has the capability to measure the RSRP according to the restriction of the MPE; receiving a measurement result for each beam as reported by the terminal on the basis of the indication information; and performing beam scheduling on the basis of the measurement results.