Terminal Device SSB Multiplexing Mode Determination
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Solution Overview
Problem
In the New Radio (NR) system, there is a need to enable SSB (Synchronization Signal Block) to multiplex with downlink signals while serving as a QCL (Quasi-Co-location) reference signal, particularly in multi-TRP (Transmission/Reception Point) scenarios where SSB from different cells is involved, to support efficient downlink transmission.
Innovation Solution
The method determines the multiplexing mode of SSB and downlink signals based on the PCID (Physical Cell Identification) carried by the SSB, allowing for the multiplexing of SSB from different cells with other downlink signals, such as those from neighboring cells, by identifying whether the SSB comes from the serving or neighboring cell and determining appropriate multiplexing modes within the same OFDM symbol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SSB from different cells is multiplexed with downlink signals in the same OFDM symbol, then the multi-TRP transmission capability is improved, but the signal reception reliability deteriorates due to potential interference between signals from different cells
Solution Approach 1:
The patent segments the SSB resources from different cells by assigning them different time positions within the OFDM symbol structure. Specifically, SSB from the serving cell and SSB from neighboring cells are placed in different OFDM symbols or different time slots, allowing the terminal to receive them separately without interference, thus maintaining signal reception reliability while enabling multi-TRP transmission capability
Solution Approach 2:
The patent introduces an intermediary mechanism through the use of TCI (Transmission Configuration Indicator) states and QCL (Quasi-Co-Location) relationships to manage the multiplexing of SSB from different cells. The network configures different TCI states that indicate different QCL reference signals, allowing the terminal to distinguish and properly process SSB from different cells, thereby resolving the interference issue while supporting multi-TRP operations
2Device complexity
If SSB and downlink signals are multiplexed using PCID-based identification, then the device complexity for signal management is reduced, but the measurement precision for signal differentiation may deteriorate
Solution Approach 1:
The patent applies PCID (Physical Cell ID) as a universal identifier that serves multiple functions simultaneously: it identifies the cell source of the SSB, determines the multiplexing mode, and guides the terminal in selecting appropriate reception parameters. This multi-functional use of PCID simplifies the overall signal management complexity while maintaining adequate differentiation capability through the combination of PCID with other signal characteristics
Solution Approach 2:
The patent changes the parameter of using PCID as the basis for determining multiplexing mode, which simplifies the terminal's signal management compared to more complex identification schemes. By configuring different multiplexing modes based on PCID values, the system achieves a balance between simplifying device complexity and maintaining sufficient signal differentiation precision through the structured use of available parameters
Data Source
AI summary
This disclosure relates to a downlink transmission method and a terminal device. The downlink transmission method includes: the terminal device determines the multiplexing mode of the first SSB and the downlink signal according to the PCID carried by the first SSB; the terminal device receives the first SSB and/or the downlink signal according to the multiplexing mode. By determining the multiplexing mode of the first SSB and the downlink signal through the PCID carried by the first SSB, it is possible to support the multiplexing of the SSB from different cells and other downlink signals, thus better supporting multi-TRP transmission between cells.