User Terminal MCS Table Segmentation for URLLC eMBB Collision
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Solution Overview
Problem
Current radio communication systems, such as LTE, fail to effectively avoid multiplexing between PUCCH/PUSCH in eMBB and PUCCH/PUSCH in URLLC, leading to collisions that compromise the unique performance requirements of ultra-reliable and low-latency communications.
Innovation Solution
A user terminal is designed with a transmitting section using multiple modulation and coding scheme (MCS) tables, including a second MCS table with a lower code rate, to manage collisions between uplink transmissions, allowing for appropriate collision processing between PUCCH/PUSCH in eMBB and PUCCH/PUSCH in URLLC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PUCCH/PUSCH in eMBB and PUCCH/PUSCH in URLLC are multiplexed on the same resource, then resource utilization is improved, but collision occurs between transmissions with different performance requirements
Solution Approach 1:
The patent segments the MCS table into multiple versions (first MCS table for eMBB, second MCS table for URLLC) with different code rate characteristics. This segmentation allows independent optimization of each service type's transmission parameters, enabling collision processing where URLLC transmissions using the second MCS table can be prioritized over eMBB transmissions using the first MCS table, thus maintaining reliability while allowing resource sharing.
2Device complexity
If a single MCS table is used for all uplink transmissions, then device complexity is reduced, but collision processing between eMBB and URLLC cannot be appropriately controlled
Solution Approach 1:
The patent applies local quality by assigning different MCS table characteristics to different service types. The first MCS table is optimized for eMBB with higher code rates, while the second MCS table is optimized for URLLC with lower code rates. This localized optimization allows each service to use transmission parameters tailored to its specific requirements, enabling appropriate collision processing while maintaining clear distinctions between service types.
Solution Approach 2:
The patent changes the code rate parameter of the MCS table to create distinct transmission characteristics. By defining a second MCS table with a code rate lower than the minimum code rate of the first MCS table, the system creates a clear parameter distinction that enables identification and prioritization of URLLC transmissions during collision scenarios, providing adaptability without requiring complex multi-dimensional parameter management.
3Reliability
If URLLC transmissions are prioritized during collision, then URLLC reliability is improved, but eMBB transmission performance may deteriorate
Solution Approach 1:
The patent implements preliminary action by pre-defining the code rate relationship between the two MCS tables before collisions occur. The second MCS table for URLLC is configured with a code rate lower than the minimum code rate of the first MCS table for eMBB. This preliminary configuration enables automatic identification and prioritization of URLLC transmissions during collisions through simple code rate comparison, ensuring URLLC reliability while providing clear rules for eMBB transmission handling without requiring complex real-time decisions.
Data Source
AI summary
In order to appropriately control collision processing between PUCCH/PUSCH in eMBB and PUCCH/PUSCH in URLLC in the future radio communication systems, a user terminal according to one aspect of the present invention includes: a transmitting section configured to perform uplink transmission by using at least one of a first modulation and coding scheme (MCS) table and a second MCS table having a code rate lower than a minimum code rate defined in the first MCS table; and a control section configured to control collision processing in a case where the uplink transmission with the first MCS table and the uplink transmission with the second MCS table collide with each other.