MBSFN Tracking Reference Signals for Idle UE Multicast Sync
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G NR, face challenges in enabling effective synchronization and tracking for user equipment (UE) in idle or inactive states for broadcast/multicast services, such as streaming video and gaming, due to insufficient tracking reference signals (TRS) in multicast broadcast single frequency network (MBSFN) areas.
Innovation Solution
A base station transmits TRS configuration information to UEs in MBSFN areas, including periodic, semi-persistent, and aperiodic TRS parameters, to facilitate synchronization and tracking for broadcast/multicast services, even for idle or inactive UEs, using system information or control channels like MCCH, MAC-CE, and DCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TRS is transmitted to idle or inactive UEs in MBSFN areas, then synchronization and tracking for broadcast/multicast services is improved, but system overhead and resource consumption increase
Solution Approach 1:
The patent changes the transmission parameters of TRS by introducing three transmission modes (periodic, semi-persistent, and aperiodic) with different periodicities and activation conditions. This allows the system to adapt TRS transmission density to actual service needs, reducing unnecessary transmissions while maintaining synchronization reliability for idle/inactive UEs in MBSFN areas.
Solution Approach 2:
The patent implements dynamic TRS transmission through semi-persistent and aperiodic modes where transmission is activated/deactivated based on service requirements. The gNB can dynamically control TRS transmission timing and frequency, allowing the system to balance between synchronization reliability and resource overhead according to real-time broadcast/multicast service demands.
2Duration of action of stationary object
If TRS transmission is activated for all UEs in MBSFN areas, then service continuity during mobility is improved, but network resource consumption increases
Solution Approach 1:
The patent configures TRS parameters in advance through system information or RRC signaling, including periodicity, time domain positions, and frequency domain positions. This preliminary configuration allows UEs to prepare for potential TRS reception without immediate transmission, enabling fast activation when needed while conserving energy during periods when TRS is not required, thus maintaining service continuity efficiently.
Solution Approach 2:
The patent implements periodic TRS transmission modes where TRS is transmitted at predetermined intervals configured by the network. This periodic action ensures that idle or inactive UEs receive synchronization signals at regular intervals to maintain service continuity during mobility, while the configurable period allows optimization of energy consumption by transmitting only when necessary for service continuity.
3Adaptability or versatility
If multiple TRS transmission modes are supported, then adaptability to different service scenarios is improved, but system complexity increases
Solution Approach 1:
The patent creates a universal TRS transmission framework that supports three different transmission modes (periodic, semi-persistent, and aperiodic) within a single system architecture. The same basic TRS structure and processing mechanisms are used across all modes, with differences only in activation and timing parameters. This multi-functional design allows the system to adapt to various service scenarios without requiring separate mechanisms for each mode, thus limiting the increase in system complexity.
Data Source
AI summary
A base station may transmit a broadcast/multicast service in a multicast broadcast single frequency network (MBSFN) area multicast communication. A method of wireless communication at a base station in accordance with an aspect of the present disclosure comprises determining a broadcast/multicast service to be provided to a user equipment (UE) in a multicast broadcast single frequency network (MBSFN) area, and transmitting a tracking reference signal (TRS) to the UE, the TRS indicating information associated with receiving the broadcast/multicast service by the UE.