5G Downlink BWP Allocation Using CORESET#0-Based DCI Sizing
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing communication in fifth-generation cellular systems, particularly in scenarios like enhanced Mobile BroadBand (eMBB), Ultra-Reliable and Low Latency Communication (URLLC), and massive Machine Type Communication (mMTC), due to issues with DCI format sizes and interpretations in the context of initial and active BWPs.
Innovation Solution
A terminal apparatus and base station apparatus are designed to efficiently manage communication by utilizing advanced methods for DCI format interpretation and BWP management, including beamforming and QCL settings, to enhance communication efficiency in scenarios like eMBB, URLLC, and mMTC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal device camps on a cell with a large reference signal received power (RSRP) difference between SSB and CSI-RS, then the terminal can camp on the cell, but the terminal may select an incorrect downlink reference signal for channel quality estimation, leading to incorrect PUCCH resource indication
Solution Approach 1:
The base station pre-configures multiple downlink reference signals (SSB and/or CSI-RS) with different Ql2 values and indicates them to the terminal in advance through RRC signaling. This preliminary configuration allows the terminal to have multiple reference signal options available before actual channel quality estimation is needed, enabling it to select the most appropriate reference signal based on current channel conditions without complex real-time decision-making.
Solution Approach 2:
The patent introduces dynamic selection of downlink reference signals based on channel conditions. The terminal can dynamically choose between SSB and CSI-RS for channel quality estimation by comparing their respective Ql2 values and RSRP measurements. This dynamic approach adapts to varying channel conditions, ensuring accurate PUCCH resource indication while maintaining manageable complexity through clear selection criteria.
2Measurement precision
If the base station indicates multiple downlink reference signals with different Ql2 values, then the PUCCH resource indication accuracy is improved, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent segments the downlink reference signal configuration into multiple distinct SSB and CSI-RS resources, each with its own Ql2 value. Instead of using a single reference signal for all PUCCH resource indications, the system divides the reference signal space into multiple segments that can be selectively applied. This segmentation allows precise PUCCH resource indication for different channel conditions while managing signaling overhead by only activating necessary reference signal pairs.
Solution Approach 2:
The patent changes the Ql2 parameter values associated with different downlink reference signals to reflect their suitability for various channel conditions. By adjusting Ql2 values for SSB and CSI-RS differently, the system enables accurate PUCCH resource indication without requiring excessive signaling. The terminal uses these Ql2 parameter differences to intelligently select the appropriate reference signal, reducing the need for explicit base station instructions.
3Ease of operation
If the terminal uses a single downlink reference signal for channel quality estimation, then the processing is simple, but the accuracy of PUCCH resource indication deteriorates when channel conditions vary
Solution Approach 1:
The base station pre-configures multiple downlink reference signals with different Ql2 values and indicates them to the terminal in advance through RRC signaling. This preliminary configuration allows the terminal to have multiple reference signal options available before actual channel quality estimation is needed, enabling it to select the most appropriate reference signal based on current channel conditions without complex real-time decision-making.
Solution Approach 2:
The patent introduces different Ql2 parameter values for multiple downlink reference signals (SSB and CSI-RS). The terminal compares these Ql2 values along with RSRP measurements to determine the most suitable reference signal for channel quality estimation. This parameter-based differentiation simplifies terminal processing by providing clear selection criteria while improving PUCCH resource indication reliability through adaptive reference signal selection.
Data Source
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AI summary
A terminal apparatus of the present invention receives setting of an initial DL BWP by using an RRC message, the setting of the initial DL BWP comprises setting a first parameter and a second parameter of a CORESET#0, a value of an identifier of the CORESET#0 is 0, the first parameter represents the size of the CORESET#0, and the second parameter represents the size of the initial DL BWP. The terminal apparatus of the present invention receives a DCI format that schedules a PDSCH in an active DL BWP, and identifies, based on a field in the DCI format, a resource block set to which the PDSCH is allocated. A value of the field is determined based on the size of the DL BWP, the start resource block, and the number of consecutively allocated resource blocks. The size of the DCI format in a USS is determined based on the size of the CORESET#0, and when the field is applied to the active DL BWP, the size of the DL BWP is the size of the CORESET#0.