Base Station MBS Transmission Mode Selection
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing multicast and unicast data transmission for multicast and broadcast services (MBS) in 5G New Radio (NR) networks, particularly in determining the optimal transmission method between unicast and multicast for multiple UEs and configuring radio resources effectively.
Innovation Solution
The system employs a method where a base station communicates MBS traffic with the core network using shared tunnels and determines whether to transmit MBS data packets to UEs via unicast or multicast based on tunnel configurations, using Internet Protocol (IP) addresses and Tunnel Endpoint Identifiers (TEIDs), and maps traffic to radio bearers configured as MBS Traffic Channels (MTCHs) or Dedicated Traffic Channels (DTCHs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multicast transmission is used for MBS data packets, then network efficiency is improved by transmitting single copy to multiple UEs, but transmission reliability deteriorates when UE mobility or session management is involved
Solution Approach 1:
The system dynamically switches between multicast and unicast transmission modes based on UE mobility state, session duration, and network conditions. The base station determines the optimal transmission method for each MBS data packet by evaluating current system state, allowing the transmission mode to adapt dynamically rather than being fixed, thus resolving the contradiction between efficiency and reliability
Solution Approach 2:
The system changes transmission parameters (multicast group ID, radio bearer configuration, QoS parameters) based on UE state and network conditions. By modifying these parameters dynamically, the system can transition from multicast to unicast when reliability is compromised, or from unicast to multicast when efficiency is prioritized, resolving the contradiction through parameter adjustment
2Reliability
If unicast transmission is used for MBS data packets, then transmission reliability is improved for individual UEs, but network resource efficiency deteriorates due to multiple copies being transmitted
Solution Approach 1:
The system dynamically selects between unicast and multicast modes based on the number of active UEs, their mobility patterns, and QoS requirements. When few UEs are active or mobility is high, unicast is selected for reliability; when many UEs are stationary, multicast is selected for efficiency, thus resolving the contradiction through dynamic mode selection
Solution Approach 2:
The base station autonomously determines the optimal transmission mode for each MBS data packet by evaluating current system state without requiring explicit UE requests. This self-service mechanism allows the network to automatically balance reliability and efficiency based on real-time conditions, resolving the contradiction through autonomous decision-making
3Productivity
If shared tunnels are used for MBS traffic between base station and core network, then resource utilization is improved, but complexity increases in managing tunnel configurations and mappings
Solution Approach 1:
The base station implements a universal MBS data packet generation mechanism that handles multiple MBS sessions through a unified process. The same packet generation logic applies regardless of which MBS session or how many UEs are involved, reducing the complexity increase that would otherwise result from managing multiple separate tunnel configurations
Solution Approach 2:
The base station acts as an intermediary between the core network and multiple UEs, consolidating MBS traffic from multiple sessions into unified multicast or unicast transmissions. This intermediary function simplifies tunnel management by handling the complexity of session-to-UE mappings internally while presenting a simplified interface to the core network
4Reliability
If flexible transmission method selection is implemented, then quality of service is improved for MBS scenarios, but system complexity increases in determining optimal transmission methods
Solution Approach 1:
The base station autonomously determines the optimal transmission mode for each MBS data packet by evaluating current system state including UE mobility, session duration, and network load. This self-service decision-making process improves QoS by adapting to conditions in real-time while managing complexity through automated algorithms rather than manual configuration
Solution Approach 2:
The system changes transmission parameters (mode selection, radio bearer configuration, QoS parameters) based on evaluated system state. By systematically adjusting these parameters according to defined criteria, the system improves QoS through adaptive optimization while managing complexity through structured parameter management rather than uncontrolled system complexity
Data Source
AI summary
To manage multicast and unicast data transmissions. a base station receives. from a core network (CN), a multicast and/or broadcast services (MBS) downlink data packet via a downlink tunnel (602). The base station determines whether to transmit the MBS downlink data packet to a plurality of UEs via unicast or multicast. Then the base station transmits the MBS downlink data packet to a plurality of first UEs via a multicast data transmission (606), and/or transmits the MBS downlink data packet to a plurality of second UEs via a plurality of unicast data transmissions (608).