# Summary of S4-260059: Considerations on Work Topic 4 - Ubiquitous Access

## Document Overview

This contribution from Qualcomm introduces initial considerations for Work Topic #4 (WT#4) "Media for Ubiquitous Access" in the FS_6G_MED study (TR 26.870). The document serves as a starting point for discussions on media services support in ubiquitous networks, particularly Non-Terrestrial Networks (NTN) and low bit-rate/low power scenarios beyond speech.

## Main Technical Contributions

### Work Topic Scope and Objectives

The document clarifies the primary focus of WT#4:
- Study aspects and opportunities for media services on ubiquitous networks including NTN
- Address low bit-rate/low power scenarios beyond speech
- Identify supported bitrates, functionalities, delays, power consumption and other design vectors
- Take into account information collected in the FS_ULBC study

### Study Methodology

The contribution proposes a structured approach with the following elements:

1. **Documentation of work topics** in detail, particularly their relation to media delivery
2. **Identification of dependencies** with other working groups and collection of relevant developments within 3GPP and externally
3. **Mapping to basic functions** based on existing media delivery architectures (5GMS, 5G RTC) and SA2 architectures
4. **Gap analysis** to identify potential solutions requiring further study or normative work
5. **Coordination** with other 3GPP groups (SA1, SA2, SA3, SA5, SA6, RAN) and external organizations (SVTA, CTA WAVE, ISO/IEC JTC1 SC29, 5G-MAG, MSF, Khronos, IETF)

### References Section Updates

The CR adds relevant normative and informative references:
- TR 22.870 (SA1 6G use cases and service requirements)
- TR 23.801-01 (SA2 6G architecture study)
- TS 26.501 (5GMS architecture)
- TS 26.506 (5G RTC architecture)
- Multiple existing SA4 specifications (TS 26.114, 26.117, 26.502, 26.510, 26.511, 26.512, 26.517)
- ULBC study reference

### Technical Content Structure

#### High-level Description
Focuses on studying aspects and opportunities for media services on ubiquitous networks, with emphasis on:
- Non-Terrestrial Networks
- Low bit-rate/low power scenarios beyond speech
- Identification of supported bitrates, functionalities, delays, power consumption
- Leveraging FS_ULBC study findings

#### Potentially Relevant Use Cases and Requirements
Placeholder for SA1 use cases (to be completed)

#### Potentially Relevant 6G Architecture Key Issues
Identifies three key issues from TR 23.801-01:
- **Key Issue #4**: User Plane Architecture
- **Key Issue #23**: Support of 6G NTN
- **Key Issue #24**: Analyse 5GS IoT features and solutions

#### Initial Key Issues for Study

The document proposes two initial key issues as starting points:

1. **Channel Characteristics**: What are bitrate ranges, latencies and loss characteristics of relevant 3GPP Non-Terrestrial Networks?

2. **Service Performance**: How would existing services and applications perform under such channel conditions?

## Editorial Notes

The document includes several editor's notes indicating:
- More content to be added to the key issues section
- Need to complete use cases and requirements by checking SA1 work
- The subsection ordering may be adapted as appropriate for specific content

## Dependencies and Coordination

The study explicitly requires coordination with:
- **3GPP groups**: SA1 (TR 22.870), SA2 (TR 23.801-01), RAN (TR 38.960), SA3, SA5, SA6
- **External organizations**: SVTA, CTA WAVE, ISO/IEC JTC1 SC 29, 5G-MAG, Metaverse Standards Forum, Khronos, IETF