5G NR MBS Configuration Signaling for Cell Reselection
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Solution Overview
Problem
The challenge in managing Multicast Broadcast Service (MBS) configuration and control information in New Radio (NR) wireless networks is the lack of standardized Single Frequency Network (SFN) area information, requiring new signaling methods for service availability and scheduling, especially in different Radio Resource Control (RRC) states, and ensuring cell reselection and service continuity.
Innovation Solution
A method and system are introduced to manage MBS services in NR networks through hierarchical, mixed-mode, and flat signaling, employing new Radio Network Temporary Identifiers (RNTIs) for MCCH reception and change notification, and specifying SIBs for frequency-service mapping, which support MBS service access and ensure cell reselection and service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If hierarchical signaling is used for MBS service information delivery, then service availability and scheduling information can be provided to UEs, but the signaling complexity and overhead increase
Solution Approach 1:
The patent segments MBS service information into multiple signaling types (hierarchical, mixed-mode, and flat signaling) delivered through different channels and messages. System information blocks (SIBs) carry scheduling information, while dedicated RRC messages provide service-specific configuration, dividing the information delivery task into manageable parts that reduce overall signaling complexity
Solution Approach 2:
The patent introduces multiple dimensions for information delivery including different RRC states (idle, inactive, connected), multiple message types (SIBs, RRC messages, MAC CE), and various signaling modes. This multi-dimensional approach allows flexible information delivery adapted to specific network conditions and UE states, optimizing the balance between information completeness and signaling overhead
2Reliability
If new RNTIs are introduced for MCCH reception and change notification, then MBS service access reliability is improved, but the identifier management complexity increases
Solution Approach 1:
The patent introduces new RNTI types (MBS-RNTI, MCCH-RNTI, G-RNTI) that serve multiple functions within the MBS framework. These RNTIs are used for PDCCH addressing, MCCH reception, change notifications, and service-specific data delivery, consolidating multiple identification needs into standardized identifier types that improve reliability while managing complexity through uniform treatment
Solution Approach 2:
The new RNTIs act as intermediaries between the physical layer and higher-layer MBS protocols. They provide a standardized interface for addressing and identification, mediating between radio resources and MBS service delivery, which simplifies the overall system by introducing a clear layering approach rather than direct complex mappings
3Reliability
If SIBs are used for frequency-service mapping, then cell reselection and service continuity are ensured, but the system information overhead increases
Solution Approach 1:
The patent applies local quality by providing frequency-service mapping information specifically in SIBs where it is most needed for cell reselection and service continuity. Rather than distributing this information uniformly across all signaling channels, it is concentrated in SIB structures that are already broadcast for system information, optimizing delivery efficiency and reducing redundant overhead
Solution Approach 2:
The patent performs preliminary action by pre-configuring frequency-service mapping relationships in SIBs before UEs need to perform cell reselection. This advance preparation ensures that when UEs encounter cell reselection scenarios, the necessary mapping information is already available, enabling seamless service continuity without requiring additional real-time signaling exchanges
4Adaptability or versatility
If support for multiple RRC states is implemented, then MBS service accessibility is improved, but the state management complexity increases
Solution Approach 1:
The patent implements dynamics by enabling MBS service information delivery adapted to different RRC states (idle, inactive, connected). The system dynamically adjusts the signaling approach based on UE state - using broadcast SIBs for idle/inactive states and dedicated RRC messages for connected states - allowing flexible service accessibility while managing complexity through state-aware protocol selection
Data Source
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AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. Embodiments herein provide a method for managing control information of MBS services in a wireless network. The method includes broadcasting, by a BS (200) in the wireless network, a first message with scheduling information of a second message to a plurality of UEs (100A) in the wireless network. The method includes receiving, by a UE (100) in the plurality of UEs (100A), the first message. The method includes broadcasting, by the BS (200), the second message includes the control information of the MBS services to the plurality of UEs (100A) based on the scheduling information. The method includes receiving, by the UE (100), the second message based on the scheduling information in the first message. The method includes accessing, by the UE (100), the interested MBS service from the BS (200) using the control information in the second message.