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Work item:
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J.ibs-sa
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Subject/title:
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System architecture for IP broadcast services in cable television by using multiple-input-multiple-output (MIMO) in IMT-2020 radio system
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Status:
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Under study
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Approval process:
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AAP
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Type of work item:
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Recommendation
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Version:
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New
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Equivalent number:
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-
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Timing:
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2027-04 (Medium priority)
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Liaison:
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ITU-R SG6, JCA-IMT2020, and ITU-T SG15.
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Supporting members:
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NEC Corporation, Japan Cable Laboratories, Ministry of Internal Affairs and Communications (Japan)
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Summary:
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The IMT-2020 radio system is expected to replace wiring inside apartment buildings in urban areas and cable television systems in rural areas. However, certain system architecture requirements shall be met for the IMT-2020 radio system to serve as an alternative to cable television, including limitations on bandwidth usage. This Recommendation outlines the system architecture for IP broadcast services in cable television utilizing MIMO technology as a feature of the IMT-2020 radio system, to meet the functional requirements specified in the draft Recommendation J.ibs-req. The objective of this Recommendation on system architecture is to ensure both high reliability in IP broadcasting of television services and high efficiency in data communication.
ITU-T J.152 and ITU-T J.153 already cover IP broadcast services, facilitating the connection of transmitted TV signals via hybrid fibre-coaxial (HFC) or fibre to the IMT-2020 radio system. This Recommendation further specifies the system architecture for the dynamic control of MIMO within the IMT-2020 framework. Figure 1 shows the position of this Recommendation in relation to cable television systems, existing IP broadcasting Recommendations (J.152 and J.153), and IMT-2020 radio systems. The MIMO function itself is included in the IMT-2020 systems. Note that both J.ibs-req and J.ibs-sa cover MIMO control; however, they specify functional requirements and system architecture, respectively.
The key difference is that pure IPTV operators utilize a one-to-one communication model, whereas the target IP broadcast systems utilize multicast and broadcast services (MBS), a feature of IMT-2020, for one-to-many communication.
The term IP broadcasting, as intended in this Recommendation, refers to the distribution of cable multi-channel programming based on MBS and is positioned equivalently to IPTV.
- IP broadcasting employs single-stream MIMO, prioritizing picture quality.
- Data communication utilizes multi-stream MIMO, focusing on transmission efficiency.
The use of MIMO facilitates IP broadcasting with reduced bandwidth usage, thereby freeing more bandwidth for data communication, considering the limitations on bandwidth availability.
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Comment:
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In collaboration with Q14/21
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Reference(s):
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Historic references:
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Contact(s):
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First registration in the WP:
2025-11-18 15:11:32
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Last update:
2025-11-21 17:24:52
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