The proliferation of video services, ad-hoc multicast/broadcast streams, software delivery over wireless, group communications and broadcast/multicast IoT applications have created a need for a flexible and dynamic allocation of radio resources between unicast and multicast services within the network as well as support for a stand-alone deployment of multicast/broadcast network. Moreover, enabling such a service over a network for a wide range of inter-site distances between the radio base stations will enable a more efficient and effective delivery system for real-time and streaming multicast/broadcast content over wide geographic areas as well as in specific geographic areas spanning a limited number of base stations. A flexible multicast/broadcast service will allow the 5G system to efficiently deliver such services.
The following set of requirements complement the requirements listed in 3GPP TS 22.146
, TS 22.246
and TS 22.101, clause 32
The 5G system shall support operation of downlink only broadcast/multicast over a specific geographic area (e.g. a cell sector, a cell or a group of cells).
The 5G system shall support operation of a downlink only broadcast/multicast system over a wide geographic area in a spectrally efficient manner for stationary and mobile UEs.
The 5G system shall enable the operator to reserve 0% to 100% of radio resources of one or more radio carriers for the delivery of broadcast/multicast content.
The 5G network shall allow the UE to receive content via a broadcast/multicast radio carrier while a concurrent data session is ongoing over another radio carrier.
The 5G system shall be able to support broadcast/multicast of UHD streaming video (e.g. 4K/8K UHD).
Taking into account the bandwidth needs for different streaming video resolution.
The 5G network shall allow the operator to configure and broadcast multiple quality levels (i.e. video resolutions) of broadcast/multicast content for the same user service in a stand-alone 3GPP based broadcast/multicast system.
The 5G network shall support parallel transfer of multiple quality levels (i.e. video resolutions) of broadcast/multicast content for the same user service to the same UE taking into account e.g. UE capability, radio characteristics, application information.
The 5G system shall support parallel transfer of multiple multicast/broadcast user services to a UE.
The 5G system shall support a stand-alone multicast/broadcast network comprising of multiple cells with inter-site distances of up to 200 km.
The 5G system shall support multicast/broadcast via a 5G satellite access network, or via a combination of a 5G satellite access network and other 5G access networks.
The 5G system shall be able to setup or modify a broadcast/multicast service area within [1s].
The 5G system shall be able to apply QoS, priority and pre-emption to a broadcast/multicast service area.
The 5G system shall support downlink parallel transfer of the same content, via broadcast/multicast and/or unicast, such that all receiver group members in a given area receive the media at the same time according to user perception.
In this context user perception refers to a difference in delay of typically less than 20 ms.
The 5G system shall support a mechanism to inform a media source of relevant changes in conditions in the system (e.g. capacity, failures).
The 5G system shall provide means for a media source to provide QoS requirement requests to the broadcast/multicast service.
The 5G system shall provide means for the broadcast/multicast service to inform the media source of the available QoS, including modification of available QoS characteristics and availability of the broadcast/multicast service.
The 5G system shall be able to support broadcast/multicast of voice, data and video group communication, allowing at least 800 concurrently operating groups per geographic area.
In this context "concurrently operating groups" means that the associated media streams are delivered concurrently.