CQI Reporting and TBS Indication for Lower BLER Targets
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Solution Overview
Problem
The existing CQI reporting framework in wireless communication systems is inadequate for ultra-reliable low-latency communications (URLLC) due to limitations in transport block size (TBS) determination and MCS selection, leading to inefficient resource allocation and increased BLER, particularly for lower BLER targets.
Innovation Solution
Improved TBS indication and CQI reporting mechanisms that allow user equipment to derive TBS based on explicit or implicit indications, bypassing traditional procedures, and adjust CQI reporting to optimize resource allocation for lower BLER targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional TBS determination and MCS selection procedures are used, then the existing CQI reporting framework operates, but resource allocation efficiency deteriorates and BLER increases for URLLC
Solution Approach 1:
The patent changes the parameters of TBS determination by introducing multiple TBS tables (first TBS table and second TBS table) with different structures and mappings. The network can select different TBS tables based on service requirements, enabling optimized resource allocation for URLLC with lower BLER targets while maintaining efficiency through explicit TBS indication rather than traditional MCS-based derivation
Solution Approach 2:
The patent segments the TBS determination process by dividing it into multiple independent TBS tables, each optimized for specific scenarios. The first TBS table is used for traditional services while the second TBS table is optimized for URLLC services with lower BLER targets. This segmentation allows the system to select the appropriate table based on service type, resolving the contradiction between reliability and productivity
2Measurement precision
If explicit TBS indication is used, then TBS determination accuracy improves, but signaling overhead increases
Solution Approach 1:
Instead of always using full explicit TBS indication which would maximize accuracy but also maximize overhead, the patent uses partial action by providing TBS indication only when necessary (e.g., when second TBS table is configured and applicable). The network can choose to use the indication field sparingly, achieving sufficient accuracy for URLLC without consistently incurring the overhead cost
Solution Approach 2:
The patent makes the indication field multi-functional by using it for both traditional MCS indication purposes and the new TBS indication purpose. The same indication field in DCI can point to different TBS tables depending on configuration, allowing the system to achieve improved accuracy without adding dedicated new signaling resources
3Adaptability or versatility
If multiple TBS tables are configured, then adaptability for different service types improves, but system complexity increases
Solution Approach 1:
The patent introduces dynamics by allowing the network to dynamically select which TBS table to use based on the service type and requirements. The UE is configured with multiple TBS tables but only needs to apply the appropriate one based on network indication or pre-agreed rules, making the system adaptable without requiring the UE to permanently maintain complex logic for all possible configurations
Data Source
AI summary
A method, apparatus, and a computer-readable storage medium are provided for improved transport block size (TBS) indication and channel quality indicator (CQI) reporting for lower target block error ratios (BLERs). In an example implementation, the method may include a user equipment configuring a plurality of transport block sizes, activating one or more transport block sizes of the plurality of transport block sizes, and determining a first transport block size from an indication received from a network node when more than one transport block sizes of the one or more transport block sizes are activated. The method may further include determining, a second transport block size, the second transport block size determined based at least on the one or more transport block sizes that are activated and the first transport block size, and receiving a downlink transmission from the network node with the second transport block size. In an additional example implementation, the method may include a user equipment determining a channel quality indicator based at least on a physical downlink shared channel received from a network node and transmitting the channel quality indicator to the network node.