MCVideo pull is enabled in both on-network and off-network mode.
For on-network MCVideo pull is supported between MCVideo clients, or between a MCVideo client and a MCVideo server.
For off-network MCVideo pull is supported between MCVideo clients only.
The procedure describes the case where an MCVideo user is initiating an MCVideo private call to pull video from called MCVideo user in an automatic or manual commencement mode. Only the called party is allowed to transmit video.
Procedures in Figure 22.214.171.124.2-1 are the basic signalling control plane procedures for the MCVideo client initiating establishment of MCVideo private call with the chosen MCVideo user for video pull.
Optionally, MCVideo client 1 may have a functional alias activated to be used.
The MCVideo server may have subscribed to the MCVideo functional alias controlling server within the MC system for functional alias activation/de-activation updates.
MCVideo user on MCVideo client 1 initiates video pull from MCVideo client 2, by sending a private call request to the MCVideo server using a service identifier as defined in TS 23.228 for MCVideo, for establishing a private call with the chosen MCVideo user for video pull. The MCVideo private call request contains MCVideo ID of invited user, an SDP offer containing one or more media types and the video pull indication to indicate that invited user is requested to transmit video to the requester. The MCVideo user at MCVideo client 1 may include a functional alias used within the MCVideo private call request.
MCVideo server checks whether the MCVideo user at MCVideo client 1 is authorized to initiate the private call for video pull, and that MCVideo user at MCVideo client 2 is authorized to receive the private call for video pull. MCVideo server verifies whether the provided functional alias, if present, can be used and has been activated for the user.
If authorized, MCVideo server includes information that it communicates using MCVideo service, offers the same media types or a subset of the media types contained in the initial received request, includes the requested automatic commencement mode indication based on a requested commencement mode by the calling user or based upon the setting of the called MCVideo client and sends the corresponding MCVideo private call request towards the MCVideo client 2, including the MCVideo ID, and, if available the functional alias of the calling MCVideo user 1. If the called MCVideo user has registered to the MCVideo service with multiple MCVideo UEs and has designated the MCVideo UE for receiving the private calls, then the incoming MCVideo private call request is delivered only to the designated MCVideo UE.
Upon receiving the MCVideo private call response from MCVideo client 2 accepting the private call request for video pull, the MCVideo server informs the MCVideo client 1 about successful call establishment via a private call response message.
One-from-server video pull is a private call between the calling party and the MCVideo server that allows the calling party to request streaming of a video from the server where it is stored in a file. The one-from-server video pull ends typically when the end of the video file has been reached or when the transmission is stopped by the calling user or by the MCVideo server.
MCVideo user on MCVideo client 1 initiates the pull of a video from the server and sends an MCVideo pull from server request to the MCVideo server. The request contains the URL of the video file and an SDP offer with media description.
A MCVideo client pulls a video from another MCVideo client directly, i.e. without involving the network.
Off-network video pull communications are based on ProSe capabilities as described in clause 7.18.
Figure 126.96.36.199.2-1 describes procedures for an off-network MCVideo video pull, inititated by MCVideo user A at MCVideo client A with another MCVideo client B, to pull a video to MCVideo client A.
MCVideo client B can be an autonomous MCVideo client or can be a human controlled MCVideo client. In either case, following procedure should be followed.
MCVideo user A has initiated MCVideo video pull with MCVideo user B.
MCVideo client A and MCVideo client B are members of the same ProSe Discovery group and are ProSe 1:1 direct communication capable.
MCVideo client A has discovered MCVideo client B in proximity, associated with MCVideo user B, using ProSe Discovery procedures.
The MCVideo client A sends a Private communication request towards the MCVideo client B. The Private communication request includes a video pull request and indicates MCVideo client A as the intended recipient of the video pull. Private communication request contains the SDP offer.
The MCVideo client B automatically accepts the video pull request, and sends a Private communication answer response indicating the acceptance of the video pull request. The Private communication answer response contains SDP answer.