3GPP TR 26.942 Change Request Summary

Document Information

• CR Number: 0023 rev 1
• Version: 19.0.0 → 20.0.0
• Category: B (addition of feature)
• Release: Rel-20
• Work Item: FS_Energy_Ph2_MED
• Source: BBC, Orange

Purpose

This CR proposes normative work and potential further study following the Feasibility Study on energy-related enhancements for media services (5GMS and RTC systems).

Main Technical Contributions

1. General Structure Changes

• Added new normative references:
• TS 26.512: 5G Media Streaming Protocols
• TS 26.113: Real-Time Media Communication Protocols and APIs
• Restructured Clause 9 from "Proposed next steps" to "Recommendations" with multiple subclauses

2. Recommendations from Version 19 (Clause 9.2)

Key Findings

The study identified that normative work on Key Issue #1 (Energy-related information exposure) is premature because:
- The Energy Information Function (EIF) defined in TS 23.501 is not yet fully specified
- Capabilities and interfaces of EIF need complete definition first

Outstanding Questions Identified

1. Provisioning mechanisms: How Application Service Providers provision Information Exposure Specifications in the Energy Information AF (may require PCF/EIF interaction)
2. Energy Policy concept: Whether an Energy Policy is needed for ASPs to specify 5GMS System reactions to energy-related information
3. System reactions: How 5GMS AS/Client and RTC System functions should react to energy-related information, including:
4. Notification/renegotiation with PCF
5. Modifications to 5GMS AS and Media Stream Handler behavior
6. Dynamic Policy re-instantiation

Recommended Approach

A phased approach is recommended:
1. Wait for complete EIF definition and TR 22.883 completion
2. Update the TR with:
- Detailed EIF interaction specifications
- New Key Issues for unaddressed questions
- New Key Issues from TR 22.883 use cases
3. Then initiate normative work

TR 22.883 Integration

The study will address new use cases on:
- Information exposure of network energy characteristics (consumption, supply mix, carbon footprint, capacity, availability)
- Dynamic service adjustments based on energy characteristics
- Security, charging, and privacy aspects

3. Recommendations from Version 20 (Clause 9.3)

Core Recommendation

Normative definition and specification of an energy architecture based on Solution #5, instantiated in both 5GMS and RTC Systems.

Detailed Normative Work Specifications

3.1 New Stage 2 Technical Specification

Define generic architecture and procedures for Energy Information AF and Energy Information Collector, covering:
- E1 reference point: Provisioning the Energy Information AF
- E3 reference point: AS Energy Reports subscription/exposure from Application Servers to Energy Information AF (with baseline parameters)
- E5 reference point: Aggregated network energy information exposure from Energy Information AF to Energy Information Collector in UE (with baseline parameters)
- E6 reference point: Aggregated energy information exposure from Energy Information Collector to UE Application (with baseline parameters)

3.2 New Stage 3 Technical Specification

Specify network APIs for:
- Energy Information AF and Energy Information Collector at E1, E3, E5
- Client API exposed by Energy Information Collector to Application at E6

3.3 TS 26.501 Enhancements (5GMS)

New clauses defining:
- Architecture instantiation in 5G Media Streaming System
- Collaboration scenarios extending generic procedures for 5GMS-specific Use Cases

3.4 TS 26.506 Enhancements (RTC)

New clauses defining:
- Architecture instantiation in RTC System
- Collaboration scenarios for RTC-specific Use Cases
- Note: Generic scenarios from TS 26.501 may be referenced

3.5 TS 26.512 Extensions (5GMS Protocols)

Specify:
- Procedure and interface extensions at E1, E3, E5 for 5GMS System
- Example: 5GMS AS extracting/exposing energy information from DASH media segments
- Client API extensions at M6 reference point (Energy Information Collector in Media Session Handler to 5GMS-Aware Application)

3.6 TS 26.113 Extensions (RTC Protocols)

Specify:
- Procedure and interface extensions at E1, E3, E5 for RTC System
- Example: RTC AS extracting/exposing energy information from RTP header extensions
- Client API extensions at RTC-6 reference point (Energy Information Collector in Media Session Handler to RTC-Aware Application)

Key Architectural Elements

New Entities

• Energy Information AF: Network function for aggregating and exposing energy information
• Energy Information Collector: UE-side function for collecting and exposing energy information to applications

Reference Points

• E1: Provisioning interface to Energy Information AF
• E3: AS to Energy Information AF interface
• E5: Energy Information AF to Energy Information Collector interface
• E6: Energy Information Collector to Application interface
• M6: 5GMS-specific interface (Media Session Handler to Application)
• RTC-6: RTC-specific interface (Media Session Handler to Application)

Work Item Scope

The CR establishes a comprehensive framework for energy-aware media services spanning:
- Generic architecture applicable to multiple systems
- System-specific instantiations (5GMS and RTC)
- Protocol-level specifications
- Client-side API definitions