MCCH Beam-Sweeping Reception Using PDCCH-SSB Mapping
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Solution Overview
Problem
In the NR system, determining how a terminal device correctly receives MCCH signaling transmitted via beam sweeping for multicast and broadcast services is challenging, especially in RRC idle, inactive, or connected states.
Innovation Solution
A method is provided where a terminal device determines a correspondence between PDCCH occasions and SSB indexes to receive MCCH PDCCH, utilizing a new SIB for configuring MCCH, which includes information for correctly receiving MCCH signaling and associated MTCH data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MCCH signaling is transmitted via beam sweeping, then coverage and reliability are improved, but the complexity of determining correct reception increases
Solution Approach 1:
The network device pre-configures the correspondence between PDCCH occasions and SSB indexes, and pre-transmits indication information about this correspondence to terminal devices. This allows terminal devices to determine the correct PDCCH occasion for receiving MCCH signaling in advance, without complex real-time beam alignment procedures, thus improving reliability while reducing device complexity.
Solution Approach 2:
The patent introduces an intermediary mechanism (indication information carrying the PDCCH occasion-SSB index correspondence) that mediates between the beam sweeping transmission and the terminal device's reception process. This intermediary provides a clear mapping relationship that simplifies the terminal device's task of identifying the correct reception occasion, resolving the contradiction between reliable beam-based transmission and simple device operation.
2Area of stationary object
If beam sweeping is used for MCCH transmission, then signal coverage is improved, but the difficulty of detecting and measuring correct reception occasions increases
Solution Approach 1:
The network device pre-determines and signals the correspondence between PDCCH occasions and SSB indexes before MCCH transmission. Terminal devices use this pre-provided mapping information to directly identify which PDCCH occasion corresponds to their received SSB, eliminating the need for complex detection and measurement procedures, thus maintaining wide coverage while simplifying occasion detection.
Solution Approach 2:
The indication information serving as an intermediary provides a direct mapping between SSB reception and PDCCH monitoring occasions. This intermediary eliminates the detection difficulty by providing explicit guidance on which PDCCH occasion to monitor based on the received SSB index, while the beam sweeping maintains extensive coverage.
3Adaptability or versatility
If MCCH signaling is broadcast to terminal devices in various RRC states, then service accessibility is improved, but the complexity of configuration and management increases
Solution Approach 1:
The patent implements a universal configuration mechanism where the same PDCCH occasion-SSB index correspondence and indication information are used for terminal devices in all RRC states (idle, inactive, and connected). This multi-functional approach allows a single configuration scheme to serve multiple RRC states, improving service accessibility across different states while avoiding the need for separate complex configurations for each state.
Data Source
AI summary
Provided are an MCCH scheduling transmission method, a terminal device and a storage medium. The method comprises: a terminal device determining the correspondence between PDCCH occasions and SSB indexes, wherein a PDCCH occasion is used for transmitting an MCCH PDCCH; and the terminal device receiving the MCCH PDCCH on the basis of the correspondence between the PDCCH occasions and the SSB indexes.