DCI TBS Scaling for Redcap UE Coverage
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Solution Overview
Problem
Current MTC and NB-IOT technologies in LTE systems are inadequate for supporting high-rate and low-latency IoT services, such as video monitoring and industrial sensing, due to limitations in data rate and latency requirements, necessitating the development of new user equipment like Redcap UE for 5G NR-lite, which faces challenges in coverage enhancement and power saving.
Innovation Solution
Incorporating TBS scaling indication information in downlink control information (DCI) to indicate scaling factors for Transport Block Size (TBS) scaling, allowing base stations to adjust transmission parameters to enhance coverage and reduce encoding bit rates, while multiplexing bits originally used for power control or MCS indication to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MTC and NB-IOT technologies are used in LTE systems, then low-rate and high-latency scenarios are supported, but high-rate and low-latency IoT services cannot be supported
Solution Approach 1:
The patent introduces TBS scaling indication information in DCI to dynamically adjust the transport block size scaling factor, enabling flexible adaptation of data transmission parameters. This allows the system to optimize data rates and latency performance for different service requirements, transitioning from fixed-parameter MTC/NB-IOT to dynamic parameter adjustment in 5G NR-Redcap
2Reliability
If TBS scaling indication information is added to DCI, then coverage enhancement and reception effects are improved, but DCI structure complexity increases
Solution Approach 1:
The patent designs the TBS scaling indication information to serve multiple functions: it indicates the scaling factor for transport block size, enables coverage enhancement through dynamic adaptation, and maintains backward compatibility with existing DCI structures. The indication can be integrated with existing DCI formats without requiring completely new message structures
Solution Approach 2:
The patent introduces dynamic TBS scaling factors that can be adjusted in real-time based on channel conditions and service requirements. The scaling indication information allows the base station to dynamically select from multiple scaling factors (e.g., 1, 1/2, 1/4, 1/8), enabling flexible adaptation rather than fixed parameter configurations
3Productivity
If bits originally used for power control or MCS indication are multiplexed for TBS scaling indication, then resource utilization is optimized, but flexibility in power control and MCS indication is reduced
Solution Approach 1:
The patent combines multiple control functions into the DCI structure by multiplexing TBS scaling indication with existing power control or MCS indication fields. This merging approach allows efficient use of limited DCI resources while maintaining the essential control functions through integrated rather than separate message structures
Data Source
AI summary
A method for sending a downlink transmission is provided. The method includes sending the downlink transmission to a user equipment (UE). A downlink control information (DCI) in the downlink transmission includes transport block size (TBS) scaling indication information, and the TBS scaling indication information is used for indicating a scaling factor used in performing TBS scaling.