Idle Channel EVM Calculation Using Reference Symbols
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Solution Overview
Problem
Conventional methods for calculating error vector magnitude (EVM) require user data transmission, making it impossible to assess radio frequency channel quality before user data transmission or synchronization, limiting pre-user communication health checks in eNodeB equipment.
Innovation Solution
The method involves calculating EVM using reference symbols or synchronization symbols transmitted during idle channel states, allowing for channel quality assessment without user or control channel data, utilizing a network equipment test device to perform channel estimation and EVM calculation alternately with reference symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional EVM calculation relying on user data is used, then EVM can be calculated during data transmission, but pre-user communication health check of eNodeB is impossible
Solution Approach 1:
The patent applies preliminary action by using reference symbols transmitted before user data to perform channel quality measurement in advance. The eNodeB transmits reference symbols during idle channel states, allowing the UE to calculate EVM before actual user data transmission begins, thus enabling pre-health checks of the eNodeB.
Solution Approach 2:
The patent uses reference symbols as an intermediary element to enable channel quality measurement without requiring user data transmission. These reference symbols act as a mediator between the eNodeB and UE, allowing EVM calculation to be performed independently of user data communication.
2Reliability
If reference symbols are transmitted during idle channel states, then pre-user communication health check becomes possible, but user data transmission capability is reduced
Solution Approach 1:
The patent applies segmentation by dividing the channel into different states: idle channel states for reference symbol transmission and active channel states for user data transmission. This allows the system to perform health checks during idle periods without interfering with user data transmission during active periods.
Solution Approach 2:
The patent implements periodic action by transmitting reference symbols during idle channel states in a periodic manner. This allows continuous monitoring of channel quality without requiring constant user data transmission, maintaining system reliability while preserving productivity during active periods.
Data Source
AI summary
Methods, systems, and computer readable media for determining a metric of radio frequency channel quality for idle channels are disclosed. One method includes receiving a plurality of reference symbols transmitted by a transmitter for an idle channel state when user data and control channel data are not transmitted over the radio frequency channel. The method further includes computing a metric of channel quality using at least one of the reference symbols.