Study on XR (Extended Reality) and media services
The Technical Report studies key issues, solutions and conclusions on the support of advanced media services, e.g. High Data Rate Low Latency (HDRLL) services, AR/VR/XR services, and tactile/multi-modality communication services. The objectives include:
Enhancements for supporting multi-modality service:
- Study whether and how to enable delivery of related tactile and multi-modal data (e.g. audio, video and haptic data related to a specific time) with an application to the user at a similar time, focusing on the need for policy control enhancements (e.g. QoS policy coordination).
Enhancements of network exposure to support interaction between 5GS and application:
- Study whether and how interaction between AF and 5GS is needed for application synchronization and QoS policy coordination among multiple UEs or between multiple QoS flows per UE.
- Study exposure of 5GS QoS information (e.g. QoS capabilities) and network conditions to the Application to enable quick codec/rate adaptation help to provide desired QoE (e.g. such as assist in alleviating 5GS congestion).
Study whether and how the following QoS and policy enhancements for XR service and media service transmission are performed:
- Study the traffic characteristics of media service enabling improved network resources usage and QoE.
- Enhance QoS framework to support PDU Set granularity (e.g. video/audio frame/tile, Application Data Unit, control information), where a PDU Set consists of PDUs that have the same QoS requirements.
- Support differentiated QoS handling considering different importance of PDU Sets. e.g. eligible drop packets belong to a less important PDU Set to reduce the resource wasting.
- Whether and how to support uplink-downlink transmission coordination to meet RTT (Round-Trip Time) latency requirements between UE and N6 termination point at the UPF.
- Potential policy enhancements to minimize the jitter, focusing on i.e. requirement provisioning from AF, extension of PCC rule.
Study potential enhancements of power management considering traffic pattern of media services:
- Power saving enhancement e.g. support trade-off of throughput/latency/reliability considering device battery life, whether and how to enhance CDRX, considering XR/media traffic pattern.
NOTE: Whether to define a network slice type supporting media services can be determined during normative phase.