Downlink Transport Block Mapping for URLLC Signaling Reduction
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Solution Overview
Problem
In 5G communications systems, improving downlink data transmission reliability without increasing latency or signaling overheads is a challenge, particularly for URLLC services, as diversity transmission methods often lead to increased latency or resource indication signaling overheads.
Innovation Solution
The method involves encoding information into multiple transport blocks, mapping them to time-frequency resources, and using a base station to send downlink resource indication information that specifies only the location of one transport block, allowing user equipment to determine the others based on pre-obtained parameters, thereby reducing the need for repeated resource indication and enhancing diversity transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diversity transmission is performed on downlink data to improve reliability, then downlink data transmission reliability is improved, but latency increases or downlink resource indication signaling overheads increase
Solution Approach 1:
The downlink data is segmented into multiple transport blocks that are transmitted on different time-frequency resources. The resource indication signal is segmented to indicate only the first transport block location, while other transport block locations are determined by pre-configured rules. This segmentation allows diversity transmission to improve reliability while minimizing the signaling overhead and latency associated with indicating all transport block locations.
Solution Approach 2:
The network pre-configures the user equipment with rules for determining the time-frequency resources of transport blocks before actual data transmission. These preliminary configurations include parameters such as resource offsets, spacing, and mapping patterns. When diversity transmission is performed, the user equipment can automatically determine the locations of subsequent transport blocks based on these pre-configured rules, eliminating the need for real-time signaling and thus reducing latency and signaling overhead.
2Reliability
If diversity transmission is performed on downlink data to improve reliability, then downlink data transmission reliability is improved, but downlink resource indication signaling overheads increase
Solution Approach 1:
The invention extracts only the essential information needed for resource indication - specifically, the location of the first transport block - from the complete set of transport block location information. The user equipment uses pre-configured rules to derive the locations of remaining transport blocks. This extraction approach significantly reduces the downlink resource indication signaling overhead while maintaining the ability to support diversity transmission for improved reliability.
3Reliability
If multiple transport blocks are transmitted with full resource indication to ensure reliability, then downlink data transmission reliability is improved, but signaling overheads increase
Solution Approach 1:
The pre-configured resource determination rules serve multiple functions: they enable the user equipment to determine locations of multiple transport blocks, support diversity transmission schemes, and reduce signaling overhead simultaneously. This multi-functionality allows the system to maintain high reliability through comprehensive transport block indication while keeping the signaling overhead low, as the same configuration framework serves all these purposes.
Data Source
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AI summary
This application provides a downlink information transmission method and apparatus, and a device. The method includes: encoding information into a plurality of transport blocks; determining a time-frequency resource used to send each transport block; sending downlink resource indication information to user equipment, where the downlink resource indication information indicates a time-frequency resource location occupied by an Mth transport block; and sending corresponding transport blocks on the time-frequency resources. The user equipment receives the transport blocks based on the downlink resource indication information and decodes the transport blocks to obtain the information, where the downlink resource indication information indicates a resource of only one transport block. A terminal device may determine a time-frequency resource location of another transport block based on a location parameter of the another transport block, and receive and decode the another transport block. Same information bits are carried in a plurality of transport blocks, so that transmission reliability can be effectively improved. There is no need to notify a time-frequency resource of each transport block, so that downlink control signaling overheads are effectively reduced.