PDSCH Reception in Bandwidth Parts via QCL Grouping
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Solution Overview
Problem
In LTE and LTE-Advanced systems, user equipment (UE) may face challenges in receiving physical downlink shared channels (PDSCHs) in bandwidth parts (BWPs) due to differing transmission configuration indications (TCI) states, leading to inconsistent reception of PDSCHs.
Innovation Solution
A communication device determines a quasi-colocation (QCL) assumption based on an indication and receives PDSCHs in multiple BWPs according to this assumption, ensuring consistent reception by using the same channel characteristics for all PDSCHs and signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the eNB transmits PDSCHs in BWPs via different TCI states (different beams), then the system can support high-frequency scenario transmissions with diverse beam directions, but the UE cannot receive all PDSCHs simultaneously due to UE ability limitations
Solution Approach 1:
The patent segments the reception of PDSCHs by grouping them according to QCL assumptions. Instead of attempting to receive all PDSCHs from different TCI states simultaneously, the UE divides them into separate groups based on their QCL relationships, making the reception process manageable within UE capabilities while maintaining support for diverse beam transmissions.
Solution Approach 2:
The patent applies preliminary action by determining QCL assumptions before receiving PDSCHs. The UE proactively identifies and groups PDSCHs with the same QCL assumption in advance, preparing the reception strategy beforehand. This allows the UE to systematically handle multiple PDSCHs across different BWPs by establishing reception rules prior to actual data reception.
2Quantity of substance
If the UE attempts to receive multiple PDSCHs in different BWPs with different TCI states simultaneously, then complete data reception is possible, but the UE ability to handle simultaneous receptions is exceeded
Solution Approach 1:
The patent segments the complex task of receiving multiple PDSCHs with different TCI states by grouping them according to QCL assumptions. This division reduces the instantaneous processing complexity by handling groups of PDSCHs with identical QCL characteristics together, rather than managing each PDSCH individually across multiple simultaneous reception chains.
Solution Approach 2:
The patent applies universality by using a single QCL assumption to handle multiple PDSCHs across different BWPs. Instead of requiring separate reception mechanisms for each PDSCH-TCI state combination, the UE uses the QCL assumption as a universal grouping criterion that applies across all BWPs and TCI states, simplifying the overall reception architecture.
3Reliability
If different QCL assumptions are used for different PDSCHs in BWPs, then each PDSCH can be optimized for its specific transmission conditions, but inconsistent reception occurs across the UE
Solution Approach 1:
The patent applies preliminary action by determining QCL assumptions before PDSCH reception. This advance determination ensures that the UE establishes consistent reception parameters for groups of PDSCHs before actual transmission occurs, maintaining both optimization for specific transmission conditions and consistency in reception handling across different BWPs.
Data Source
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AI summary
A communication device for handling a plurality of physical DL shared channels (PDSCHs) in a plurality of bandwidth parts (BWPs) comprises at least one storage device and at least one processing circuit coupled to the at least one storage device. The at least one storage device stores instructions, and the at least one processing circuit is configured to execute the instructions of: determining a quasi-colocation (QCL) assumption according to an indication; and receiving at least one PDSCH of a plurality of PDSCHs in a plurality of BWPs in a time interval according to the QCL assumption from a network.