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Mission Critical Video over LTE

Summary based on the input provided by Huawei in SP-170767.

720053	Mission Critical Video over LTE	MCImp-MCVideo	2		SP-150849
670006	Study on Mission Critical Video over LTE	FS_MCVideo	3	S1	SP-150048
700030	Stage 1 of MCVideo	MCImp-MCVideo	3	S1	SP-150849
720051	Stage 2 for MCVideo	MCImp-MCVideo	3	S6	SP-160491
750018	MCVideo codecs and media handling	MCImp-MCVideo	3	S4	SP-170020
740033	Stage 3 of MCVideo	MCImp-MCVIDEO-CT	3	CT	CP-160827
740034	CT1 aspects 3 of MCVideo	MCImp-MCVIDEO-CT	4	C1	CP-160827
740035	CT3 aspects 3 of MCVideo	MCImp-MCVIDEO-CT	4	C3	CP-160827
740036	CT4 aspects 3 of MCVideo	MCImp-MCVIDEO-CT	4	C4	CP-160827
740037	CT6 aspects 3 of MCVideo	MCImp-MCVIDEO-CT	4	C6	CP-160827

Introduction

Clause 6.1 above explains the relationship in Rel-14 between TS 22.179 (MCPTT), TS 22.280 (MCCoRe), TS 22.281 (MCVideo) and TS 22.282 (MCData).

This clause deals more specifically with TS 22.281, which provides the MCPTT requirements applicable to MC Video, and the corresponding Stage 2 in 23.281.

The MCImp-MCVideo work item specifies the MCVideo service communications to support on-network and off-network operations. It defines the identities, procedures, information flows and related configurations corresponding to UE, user profile, group and service.

It specifies video media communication between several users (i.e. group call or private call), where each user has the ability to gain access to the permission to stream video in an arbitrated manner for on-network and off-network operations.

The Stage 2 (Architecture) for MCVideo is organized as the Stage 1, i.e.:

- TS 23.280 specifies the common functional architecture aspects service including the common services core and the generic mechanisms like UE-to-network relay, affiliation and emergency alerts. These common aspects applies to MCVideo; and

- TS 23.281, specifically dedicated to MCVideo. It specifies the MCVideo service functional architecture, procedures, information flows and related configuration information .

Overview of TS 22.281 on MCPTT Video

The MCVideo service capabilities specified for on-network operations are:

- MCVideo group affiliation, MCVideo group de-affiliation and remote change of affiliation to MCVideo groups.

- Group call setup, group call release, late entry to group call and re-joining a group call enabled for pre-arranged groups. Group call setup up, group call release, joining a group call and re-joining a group call enabled for chat groups. Exiting a group call due to de-affiliation is applicable for pre-arranged and chat group calls.

- Emergency group call commencement, emergency group call cancel and upgrade of a group call to emergency group call.

- Imminent peril group call commencement, imminent peril group call cancel and upgrade of a group call to imminent peril group call.

- Emergency alert initiation and emergency state cancel (applicable for group calls)

- Private call setup in automatic and manual commencement mode.

- Transmission initiation and control, remotely initiated transmission, transmission revoke, transmission cancel, transmission queued, user or server initiated transmission cancel from queue and user or remote authorized user or server initiated transmission end.

- Reception initiation and control, user or server initiated reception and mandatory or negotiated reception override.

- Configurations for MCVideo service pertaining to UE, user profile, service and group.

- User authentication (see TS 24.482) and MCVideo service authorization.

The MCVideo service capabilities specified for off-network operations are:

- Group communication setup, active join to group communication, passive join to group communication and group communication release due to inactivity.

- Emergency group communication commencement, emergency group communication cancel and upgrade of a group communication to emergency group communication.

- Imminent peril group communication commencement, imminent peril group communication cancel and upgrade of a group communication to imminent peril group communication.

- Emergency alert initiation and emergency state cancel (applicable for group calls).

- Private call setup in automatic and manual commencement mode.

- Granting a transmission, rejecting a transmission, releasing a transmission, overriding a transmission due to limit of maximum simultaneous transmissions reached and handling simultaneous transmissions.

- Transmission control in single arbitration or self-arbitration modes, overriding a transmission of a single arbitrator and assignment of a new transmission arbitrator, releasing a transmission arbitrator and delegating a new transmission arbitrator when releasing.

- Configurations for MCVideo service pertaining to UE, user profile, service and group. (see TS 24.481, TS 24.483 and TS 24.484)

The MCVideo service communications uses H.264 (AVC) codec as specified in TS 26.281. Based on operator or MCVideo service provider policy, the MCVideo service may optionally and additionally support the H.265 (HEVC) codec as specified in TS 26.281. If MCVideo service supports combined or separate handling of video and audio streams, then MCPTT audio codecs may be supported as specified in TS 26.179. The media transport protocols supported for MCVideo service are RTP and SRTP as specified in TS 26.281.

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