Default Beam Determination for FeMIMO Wireless Networks
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Solution Overview
Problem
The existing 5G-NR specification's default beam behavior for PDSCH and PDCCH is inapplicable for enhanced multi-transmit-receive point (mTRP) scenarios, necessitating a new method to determine default beam behavior for further enhanced multiple input multiple output (FeMIMO) in wireless networks.
Innovation Solution
A method and user equipment (UE) for determining default beam behavior of PDSCH and PDCCH in FeMIMO wireless networks, which involves receiving PDCCH information, determining the absence of a transmission configuration indication (TCI) state, and using quasi-co-location (QCL) information to define default beam behavior based on CORESET IDs and scheduling offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing 5G-NR specification's default beam behavior is used for PDSCH and PDCCH, then the system maintains compatibility with standard specifications, but the behavior becomes inapplicable for enhanced multi-transmit-receive point (mTRP) scenarios in FeMIMO
Solution Approach 1:
The patent segments the default beam behavior determination into multiple scenarios based on the presence or absence of TCI states in DCI formats. Different determination methods are applied to different scenario types (e.g., when TCI is present vs. when TCI is absent), allowing the system to adapt to enhanced mTRP configurations while maintaining standard compliance for conventional cases
Solution Approach 2:
The patent introduces dynamic adaptability by enabling the UE to switch between different default beam behavior determination methods based on received DCI formats and TCI state configurations. This dynamic adjustment allows the system to optimize for enhanced mTRP scenarios when needed while falling back to standard behavior when appropriate
2Reliability
If TCI states are always included in DCI formats for PDSCH scheduling, then the beam information is always available for accurate reception, but the overhead and complexity of the control channel increases
Solution Approach 1:
The patent applies partial action by including TCI states in DCI formats only when necessary for enhanced mTRP operations rather than always including them. This allows the system to provide accurate beam information when needed while avoiding unnecessary overhead and processing complexity for standard single-TRP scenarios
Solution Approach 2:
The patent changes the parameter configuration dynamically by adjusting whether TCI states are present in DCI formats based on the operational scenario. This parameter change allows the system to optimize between reliability (having TCI information) and complexity (processing overhead) depending on the specific FeMIMO configuration being used
3Adaptability or versatility
If multiple CORESETs are configured for different TRPs, then the system can support enhanced mTRP PDCCH transmissions, but determining the default beam behavior becomes more complex
Solution Approach 1:
The patent segments the CORESET configuration into multiple distinct CORESETs, each associated with a specific TRP and having its own TCI state configuration. This segmentation allows the UE to determine default beam behavior by selecting the appropriate CORESET based on which TRP is transmitting, thereby supporting enhanced mTRP PDCCH while managing determination complexity through structured organization
Solution Approach 2:
The patent introduces CORESET as an intermediary layer between the physical TRPs and the UE's beam determination process. Each CORESET acts as a mediator that carries TCI state information from a specific TRP, simplifying the UE's task of determining default beam behavior by providing a structured interface rather than requiring direct processing of multiple TRP signals
Data Source
AI summary
The disclosure relates to a pre-5G or 5G communication system to be provided for supporting higher data rates beyond a 4G communication system, such as LTE. A method includes receiving, in a first search space and a second search space that are linked for PDCCH repetition, at least one PDCCH including DCI; and receiving a PDSCH scheduled by the DCI based on QCL information of a CORESET with a lower ID among a first CORESET associated with the first search space and a second CORESET associated with the second search space, in case that the DCI does not include a TCI field and a time offset between a reception of the DCI and the PDSCH is greater than or equal to a threshold.