5G CQI and MCS Table Configuration for Variable BLER Targets
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Solution Overview
Problem
In 5G communication systems, the varying channel and interference characteristics across different frequency resources pose challenges in accurately measuring channel state information (CSI) and providing optimal data transmission, particularly for services like enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable and low-latency communications (URLLC), which require specific modulation and coding schemes based on target block error rates (BLERs).
Innovation Solution
The development of an apparatus and method for generating and configuring channel quality indicator (CQI) and modulation and coding scheme (MCS) tables, allowing for the transmission of CSI based on configured CQI tables with different transport block error probabilities, such as 0.1 and 0.00001, to support various target BLERs, enabling efficient communication between base stations (BS) and user equipment (UE).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single CQI table is used for all services, then the device complexity is reduced, but the measurement precision and transmission reliability deteriorate due to varying channel characteristics across different services
Solution Approach 1:
The patent divides the single CQI table into multiple service-specific CQI tables, each tailored to the channel characteristics of specific services (e.g., eMBB, mMTC, URLLC). This segmentation allows each table to be optimized for its specific service type, improving measurement precision without requiring a single complex universal table.
Solution Approach 2:
The patent applies local quality by configuring different CQI table properties for different services based on their specific channel characteristics. Each service receives a CQI table with parameters optimized for its local requirements, such as different target BLER values for different service types, rather than using a uniform table for all services.
2Reliability
If service-specific CQI tables are configured for different target BLERs, then the transmission reliability is improved, but the device complexity and configuration overhead increase
Solution Approach 1:
The patent changes key parameters of CQI and MCS tables, specifically the target block error rate (BLER) values, to match different service requirements. By adjusting these parameters rather than creating entirely separate tables, the system achieves service-specific optimization while maintaining a manageable configuration structure.
Solution Approach 2:
The patent creates a universal framework where a single configuration mechanism can select and apply appropriate CQI and MCS tables for different services. This multi-functional approach allows the same base station to handle multiple service types with different reliability requirements using a unified configuration system.
3Adaptability or versatility
If multiple CQI tables with different target BLERs are supported, then the adaptability to various services is improved, but the difficulty of detecting and measuring channel state increases
Solution Approach 1:
The patent implements feedback mechanisms where the base station receives channel state information from user equipment and uses this feedback to select the appropriate CQI table. The feedback loop includes transmitting configuration information about supported CQI tables and receiving measurements that indicate which table should be used for optimal performance.
Solution Approach 2:
The patent introduces dynamic selection of CQI tables based on current channel conditions and service requirements. Rather than static configuration, the system can dynamically switch between different CQI tables depending on the detected channel state and active service type, making the measurement process more adaptable.
Data Source
AI summary
The present disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting a higher data transmission rate than a 4th generation (4G) communication system such as long-term evolution (LTE). Disclosed is a method performed by a terminal that may comprise: receiving configuration information for a CSI report from a base station; acquiring a channel quality indicator (CQI) table on the basis of the configuration information for the CSI report; and transmitting CSI including a CQI according to the CQI table to the base station, wherein the CQI table is configured on the basis of a first CQI table of a case where transport block error probability is 0.1 and a second CQI table for a case where transport block error probability is 0.00001. The method performed by the terminal may further comprise: receiving configuration information relating to a physical uplink shared channel (PUSCH) or a physical downlink shared channel (PDSCH) from the base station; identifying a modulation and coding scheme (MCS) table on the basis of the configuration information relating to the PUSCH or PDSCH; and acquiring a transport block size (TBS) on the basis of the MCS table, wherein the MCS table is configured on the basis of a first MCS table configured by default and a second MCS table configured for low spectral efficiency (SE) in the base station.