# Summary of S4-260278: Performance and Metrics Evaluation for FS_QStream_MED

## Document Overview

This change request proposes a framework for performance and metrics evaluation as part of the FS_QStream_MED study item, which is commencing at SA4 Meeting #135.

## Background and Context

### Existing 3GPP Metrics Infrastructure

- 3GPP has defined metrics collection mechanisms for 5G Media Streaming through:
  - DASH metrics
  - CMCD (Common Media Client Data) client data
- These metrics are currently being extended within the 3GPP framework

### Current Implementation Status

- **DASH Players**: dash.js and Exo-Player have implemented these metrics
- **5G-MAG Reference Tools**: Include CMCD and DASH metrics collection implementations
- **Visualization**: DASHboards and other tools exist for metrics analysis
- **Data Correlation**: Metrics can be logged and correlated with emulator information

## Technical Proposal

### Proposed Metrics Collection Framework

The document proposes leveraging the existing metrics collection infrastructure with the following approach:

1. **Utilize Existing Metrics**: Use established metrics collection mechanisms already defined for 5G Media Streaming
2. **Event Framework Integration**: Log data in an event framework that maintains compatibility with existing 5G Media Streaming specifications
3. **Dual Purpose Approach**: 
   - Evaluate streaming session performance
   - Implement and validate the metrics themselves

### Key Principles

- **Consistency with 3GPP Standards**: Rely on QoE metrics as defined in 3GPP specifications
- **Standardized Reporting**: Use existing reporting frameworks for information collection
- **Meaningful Performance Data**: Create data suitable for comprehensive performance evaluation

## Benefits

- Avoids duplication of effort by reusing existing metrics infrastructure
- Ensures compatibility with established 5G Media Streaming frameworks
- Enables both performance evaluation and metrics validation in a unified approach