MCS Table Selection via RNTI in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing latency, particularly in next-generation mobile communication systems like new radio access technology (NRAT) and long-term evolution (LTE), where efficient signal transmission and reception methods are needed to improve user equipment (UE) state reporting and data channel scheduling.
Innovation Solution
The method involves configuring a radio network temporary identity (RNTI) related to the modulation and coding scheme (MCS) and using it to determine the appropriate MCS tables for scheduling uplink and downlink data channels, based on information such as quadrature amplitude modulation (QAM) and block error rate (BLER), to efficiently manage channel state information (CSI) processes across different transmission time intervals (TTIs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single MCS table is used for all RNTI types, then the system complexity is reduced, but the transmission reliability and latency performance deteriorate due to inability to optimize for different service requirements
Solution Approach 1:
The patent segments the single MCS table into multiple MCS tables (first MCS table and second MCS table) that are selectively applied based on RNTI type. This segmentation allows different MCS tables to be optimized for different service requirements (e.g., low latency services vs. regular services), thereby improving transmission reliability without requiring the system to manage a single complex table that must accommodate all scenarios.
Solution Approach 2:
The patent implements dynamic selection of MCS tables based on the RNTI type associated with the scheduled channel. The UE determines which MCS table to use by checking the RNTI type, allowing the system to adaptively switch between different MCS configurations. This dynamic approach enables optimal performance for each service type while maintaining manageable system complexity through standardized selection rules.
2Reliability
If multiple MCS tables are configured for different RNTI types, then transmission reliability and latency are improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent implements dynamic selection of MCS tables based on the RNTI type associated with the scheduled channel. The UE determines which MCS table to use by checking the RNTI type, allowing the system to adaptively switch between different MCS configurations. This dynamic approach enables optimal performance for each service type while maintaining manageable system complexity through standardized selection rules.
Solution Approach 2:
The patent enables the UE to autonomously determine which MCS table to use based on the RNTI type without requiring complex network control or additional signaling. The UE self-manages the MCS table selection by comparing the RNTI type against predefined criteria (e.g., whether the RNTI is associated with low latency service), thereby reducing network overhead and simplifying the overall system architecture.
3Measurement precision
If MCS table selection is based on detailed RNTI analysis, then the transmission accuracy is improved, but the processing time and latency increase
Solution Approach 1:
The patent performs preliminary configuration of RNTI types and their associated service characteristics (e.g., low latency flag) during system setup or connection establishment. This preliminary action allows the UE to have pre-loaded knowledge about which RNTI types correspond to which MCS tables, eliminating the need for complex real-time analysis during actual data transmission. The UE can quickly match the current RNTI against pre-configured patterns and immediately select the appropriate MCS table.
Data Source
AI summary
A method and an apparatus for receiving a signal by a terminal in a wireless communication system according to an embodiment of the present invention comprises the steps of: establishing an RNTI associated with an MCS by a terminal; receiving a control channel for scheduling transmission of an uplink data channel or reception of a downlink data channel; and transmitting the uplink data channel or receiving the downlink data channel on the basis of one MCS table of a plurality of MCS tables, wherein the uplink data channel or the downlink data channel has been scheduled by the control channel and the one MCS table is determined on the basis of an RNTI associated with the MCS and an RNTI associated with the control channel.