Multicast Broadcast Service Data Reception BWP Switching
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Solution Overview
Problem
The next-generation wireless communication systems, such as 5G NR, lack support for broadcast/multicast features, which are essential for efficient resource utilization and user experience, particularly in scenarios like massive Machine-Type Communication (mMTC) and Ultra-Reliable and Low-Latency Communication (URLLC), where traditional LTE systems fall short in dynamically managing multicast and unicast delivery modes.
Innovation Solution
A method and User Equipment (UE) implementation for Multicast/Broadcast Service (MBS) data reception, involving the reception of MBS-related control information from a Base Station (BS) to configure Bandwidth Parts (BWP) for dynamic switching between multicast (PTM) and unicast (PTP) delivery modes, enabling flexible resource allocation and improved service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional LTE systems are used for multicast and unicast delivery, then basic service coverage is maintained, but dynamic switching between multicast and unicast delivery modes is not supported, leading to inefficient resource utilization
Solution Approach 1:
The patent introduces dynamic BWP switching mechanisms that allow the system to transition between multicast and unicast delivery modes based on real-time network conditions and service requirements. The UE can be configured with multiple BWPs where different BWPs are optimized for different delivery modes, enabling flexible adaptation without static limitations.
Solution Approach 2:
The patent utilizes parameter changes by modifying BWP configuration parameters (such as bandwidth, subcarrier spacing, and cyclic prefix length) to optimize performance for different delivery modes. By changing these parameters dynamically, the system can efficiently switch between multicast and unicast operations.
2Quantity of substance
If 5G NR system is deployed without broadcast/multicast features, then network flexibility for other services is improved, but resource utilization and user experience in scenarios like mMTC and URLLC deteriorate
Solution Approach 1:
The patent makes the 5G NR system universal by integrating both unicast and multicast/broadcast capabilities within the same framework. The BWP configuration mechanism serves multiple purposes: it supports unicast data transmission, multicast service delivery, and dynamic mode switching, thereby achieving multi-functionality without requiring separate systems.
Solution Approach 2:
The patent segments the overall service delivery into different BWPs, where specific BWPs are dedicated to multicast/broadcast services while others handle unicast traffic. This segmentation allows independent optimization of each delivery mode while maintaining overall system flexibility and resource efficiency.
3Reliability
If static BWP configuration is used, then system complexity is reduced, but service continuity and QoS requirements cannot be met in dynamic 5G scenarios
Solution Approach 1:
The patent implements feedback mechanisms where the network monitors UE reception status and service quality metrics, then dynamically adjusts BWP configurations to maintain service continuity. The gNB receives feedback about MBS reception conditions and uses this information to trigger appropriate BWP switches, ensuring QoS requirements are met while managing complexity through intelligent control.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple BWPs with different parameters optimized for specific service types before actual transmission begins. This allows the system to quickly switch to the appropriate BWP when service requirements change, maintaining service continuity without real-time complex calculations.
Data Source
AI summary
A method for multicast service data reception is provided. The method determines whether a first PDCCH addressed to a first RNTI is received on a first BWP. When a BWP inactivity timer is configured, a default BWP is configured, and the first BWP is not the default BWP, the method (re)starts the BWP inactivity timer after determining that the first PDCCH is received on the first BWP, and switches to the default BWP when the BWP inactivity timer expires. When the BWP inactivity timer is configured, the default BWP is not configured, and the first BWP is not an initial BWP, the method (re)starts the BWP inactivity timer after determining that the first PDCCH is received on the first BWP, and switches to the initial BWP when the BWP inactivity timer expires.