Multicast Control Channel Scheduling via Dedicated RNTI
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Solution Overview
Problem
Current 5G networks face challenges in providing efficient broadcast and multicast services within a single cell, particularly in maintaining low quality of service (QoS) for user equipment (UE) through a multicast control channel (MCCH) carried over a physical downlink shared channel (PDSCH), due to complexities arising from millimeter wave small cells and diverse service requirements.
Innovation Solution
The implementation of dedicated radio network temporary identifiers (RNTIs) for UE configuration, allowing for the transmission of multicast and unicast services simultaneously, with specific RNTIs like single cell RNTI (SC-RNTI) and SC-N-RNTI, to schedule the MCCH and PDSCH, enabling efficient broadcast reception configurations across different radio access network (RAN) modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dedicated RNTIs (SC-RNTI, SC-N-RNTI) are introduced for scheduling MCCH and PDSCH, then broadcast reception configuration and QoS management capability is improved, but system complexity increases
Solution Approach 1:
The patent segments the RNTI identification system into multiple dedicated identifiers (SC-RNTI for scheduling MCCH, SC-N-RNTI for notifying changes, and other RNTIs for PDSCH scheduling). This segmentation allows the system to manage different broadcast and multicast services with distinct QoS requirements through separate identification mechanisms, improving adaptability while organizing complexity into manageable categories.
Solution Approach 2:
The patent implements a universal RNTI-based scheduling mechanism that can handle multiple service types (unicast, multicast, broadcast) through a single framework. The MCCH and PDSCH scheduling system serves multiple functions including service configuration, QoS management, and change notification, reducing the need for entirely separate systems for each function.
2Productivity
If MCCH is carried over PDSCH with dedicated RNTI scheduling, then broadcast and multicast service delivery is improved, but control channel complexity increases
Solution Approach 1:
The patent merges the MCCH (multicast control channel) with the PDSCH (physical downlink shared channel) by scheduling the MCCH through the same RNTI-based mechanism used for PDSCH. This consolidation allows the system to deliver broadcast and multicast services efficiently while using a unified control channel architecture, avoiding the need for separate dedicated control channels.
Solution Approach 2:
The patent uses the RNTI (radio network temporary identifier) as an intermediary mechanism that mediates between the scheduler and the receiver. The RNTI carries scheduling information and control data that enables the UE to efficiently locate and decode the MCCH and PDSCH without requiring complex control channel structures.
3Adaptability or versatility
If multiple RNTIs are used for different service types, then service differentiation and QoS management is improved, but UE processing complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific RNTIs to specific service types and QoS requirements. Each RNTI (SC-RNTI, SC-N-RNTI, and other PDSCH RNTIs) is tailored to its specific function, allowing the UE to process different services with appropriate local characteristics. This enables service differentiation while keeping each individual processing path simple and well-defined.
Data Source
AI summary
The disclosure is directed to systems and methods for multicast and broadcast services (MBS) for a wireless network including transmitting to a user equipment (UE) a signaling configuration for reception by the UE of multicast and broadcast services (MBS) in a low quality of service (QOS) multicast or broadcast delivery using an multicast control channel (MCCH) carried over a physical downlink shared channel (PDSCH) scheduled by a downlink control information (DCI) holding a cyclic redundancy check (CRC) scrambled with a dedicated radio network temporary identifier (RNTI) identifying the low QoS or broadcast reception capability of the UE. The method includes monitoring by the UE a physical downlink control channel (PDCCH) cell specific search space (CSS) configured for MBS for the DCI scheduling, the PDSCH carrying the MCCH in the DCI. The PDCCH CSS is configured for a CORESET #0 for the UE in RRC_CONNECTED/IDLE mode, the monitoring in Type0 PDCCH CSS or Type0A PDCCH CSS configured as part of a PDCCH-ConfigCommon configuration.