MCS Table Selection for Multi-Priority CSI Feedback
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently supporting multiple services with varying priority levels in 5G/NR mobile communications, particularly in managing channel state information (CSI) feedback from user equipment (UE) to a serving base station, which affects the reliability and efficiency of data transmission.
Innovation Solution
The system includes a UE and a base station equipped with a transceiver and processor configured to receive and transmit DCI formats containing a priority indicator field, modulation and coding scheme (MCS) fields, enabling the determination of MCS tables and modulation orders for efficient CSI feedback and HARQ-ACK prioritization, allowing for separate and simultaneous transmission of CSI reports with different priorities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single MCS table is used for all services, then the system complexity is reduced, but the ability to support multiple services with different priority levels and reliability requirements deteriorates
Solution Approach 1:
The patent segments the single MCS table into multiple service-specific MCS tables (first MCS table for first service type, second MCS table for second service type). Each MCS table is optimized for specific service requirements, allowing the system to support multiple services with different priority levels and reliability targets while maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent implements dynamic selection of MCS tables based on service type and priority indicator fields in DCI formats. The UE dynamically switches between different MCS tables depending on the scheduled service, enabling adaptive optimization for each service type while maintaining a unified system framework.
2Reliability
If separate MCS tables are used for different service types, then the reliability and efficiency for each service type is improved, but the device complexity increases
Solution Approach 1:
The patent creates a universal MCS table structure that serves multiple service types through configuration parameters. Each MCS table follows the same format and selection mechanism, allowing the system to handle multiple services with different requirements using a unified management approach, thereby reducing the perceived complexity despite supporting multiple services.
Solution Approach 2:
The patent uses parameter changes in the priority indicator field of DCI formats to switch between different MCS tables. By encoding service type and priority information in standardized field parameters, the system achieves service-specific optimization without requiring complex manual configuration or management of multiple tables.
3Measurement precision
If CSI reports are transmitted separately for different priorities, then the measurement precision for each service is improved, but the overhead and resource consumption increase
Solution Approach 1:
The patent merges multiple priority-specific CSI reports into a single uplink transmission when possible. The UE combines CSI feedback for different service types and priorities into unified PUCCH or PUSCH transmissions, reducing the number of separate transmissions required while maintaining the precision of individual service measurements through proper resource allocation.
Solution Approach 2:
The patent resolves the overhead issue by transitioning from time-separated transmissions to frequency/resource-separated transmissions within the same time slot. Different priority CSI reports are multiplexed in the frequency domain or through code division, allowing simultaneous transmission of multiple CSI reports with different priorities without increasing time overhead.
4Productivity
If multiple CSI reports with different priorities are transmitted simultaneously, then the productivity of the system is improved, but the resource allocation complexity increases
Solution Approach 1:
The patent applies local quality optimization by allocating specific uplink resources (PUCCH resources, PUSCH opportunities) tailored to each service type and priority level. High-priority services receive dedicated resources with guaranteed timing, while lower-priority services utilize available resources, enabling simultaneous transmissions with optimized resource usage for each service type.
Solution Approach 2:
The patent implements feedback mechanisms where the gNB monitors the successful reception of high-priority CSI reports and adjusts resource allocation for subsequent transmissions. The system uses HARQ-ACK feedback and scheduling decisions to dynamically manage resources for simultaneous multi-priority CSI transmissions, reducing allocation complexity through adaptive control.
Data Source
AI summary
Methods and apparatuses for transmitting and receiving information of different priorities. A method of operating a UE includes receiving a first PDCCH providing a first DCI format. The first DCI format schedules a reception of a PDSCH, includes an MCS field, and includes a priority indicator field. The method further includes determining an MCS table, from a first predetermined MCS table or a second predetermined MCS table, based on a value of the priority indicator field in the first DCI format; determining a modulation order and a code rate from the MCS table based on a value of the MCS field; receiving a TB in the PDSCH according to the modulation order and the code rate; and determining a priority of HARQ-ACK information in response to the TB reception based on the value of the priority indicator field in the first DCI format.