Logical Channel Prioritization With High-Reliability MCS Tables
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication systems face challenges in achieving high-reliability and low-latency data transmission due to limitations in resource configuration and transmission restrictions, particularly in supporting ultra-reliable low latency communications (URLLC) services.
Innovation Solution
The implementation of a high-reliability modulation coding scheme (MCS) and logical channel prioritization (LCP) configuration, where a base station configures allowable MCS tables for low spectral efficiencies and indicates these in the LCP configuration, allowing UEs to verify the MCS of uplink grants before transmission, ensuring alignment with configured settings to enhance communication efficiency and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resource configurations and transmission restrictions are applied to support multiple wireless communication services, then system capacity and service diversity are improved, but the ability to achieve high-reliability and low-latency targets (URLLC) deteriorates
Solution Approach 1:
The patent segments the MCS selection process by creating separate MCS tables (first MCS table for eMBB, second MCS table for URLLC) and associating each logical channel with specific MCS tables through LCP configuration. This segmentation allows different service types to use optimized MCS settings independently, resolving the conflict between service diversity and URLLC reliability requirements.
Solution Approach 2:
The patent applies local quality by configuring different MCS tables for different logical channels based on their specific service requirements. The LCP configuration enables each logical channel to have customized allowable MCS tables, ensuring that URLLC traffic receives appropriate low-latency optimized MCS settings while eMBB traffic uses high-throughput optimized settings.
2Adaptability or versatility
If multiple MCS tables are configured for different logical channels to support diverse services, then service-specific optimization is improved, but configuration complexity and coordination overhead increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple MCS tables and pre-associating them with logical channels through LCP configuration during connection establishment. The base station and UE both store the configured MCS tables and their associations beforehand, so that during actual transmission, the UE can quickly determine the appropriate MCS table based on the logical channel of the received uplink grant without complex real-time decision-making.
3Reliability
If the UE verifies MCS alignment between uplink grant and LCP configuration before transmission, then transmission reliability is improved, but processing time and latency may increase
Solution Approach 1:
The patent resolves this contradiction by performing the MCS verification action in advance during the connection setup phase. The LCP configuration pre-establishes the mapping between logical channels and allowable MCS tables, so that during actual transmission, the UE only needs to perform a simple lookup and comparison operation rather than complex real-time analysis, minimizing the time loss while ensuring reliability.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station in a wireless communications system may perform a connection procedure (e.g. radio resource control (RRC) procedure) with a user equipment (UE), during which the base station may configure the UE with logical channel prioritization (LCP) configuration for each logical channel of a set of logical channels. The LCP configuration may indicate allowable modulation coding schemes (MCSs) for each logical channel of the set of logical channels. Following the communication procedure, the UE may receive an uplink grant for transmitting data using a corresponding logical channel of the set of logical channels. The UE may identify an MCS used by the uplink grant and may transmit the data using the corresponding logical channel with the identified MCS, based on the identified MCS of the uplink grant matching an MCS of the logical channel.