Terminal Blind Decoding for URLLC Priority in eMBB Systems
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Solution Overview
Problem
Current communication systems face challenges in supporting heterogeneous services like enhanced mobile broadband (eMBB) and ultra-reliable low-latency communication (URLLC) simultaneously, particularly in managing resource allocation and prioritization of data transmission to ensure ultra-reliability and low-latency requirements.
Innovation Solution
The method involves a terminal and base station operation where the terminal performs blind decoding of downlink control information (DCI) to differentiate between eMBB and URLLC data, using distinct radio network temporary identifiers (RNTIs) and DCI formats, and configures control resource sets (CORESETS) to prioritize URLLC data transmission during eMBB data transmission, allowing for resource sharing and efficient data reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the system allocates resources for eMBB data transmission, then the data transmission capacity is improved, but the latency and reliability for URLLC data deteriorates
Solution Approach 1:
The patent segments the resource allocation by introducing separate RNTI identifiers (first RNTI for eMBB, second RNTI for URLLC) and separate DCI formats to distinguish between different service types. This allows the system to allocate resources for eMBB while maintaining dedicated resource access paths for URLLC, ensuring that URLLC data can be transmitted reliably without being blocked by eMBB traffic.
Solution Approach 2:
The patent implements dynamic resource allocation where the terminal performs blind decoding to adaptively determine whether URLLC data is present in the downlink control channel. When URLLC data is detected, the system dynamically adjusts resource allocation to prioritize URLLC transmission over eMBB, allowing flexible switching between service priorities based on real-time conditions.
2Loss of time
If the system prioritizes URLLC data transmission, then the latency is reduced, but the overall resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies partial action by having the terminal perform blind decoding only when specific conditions are met (when PDCCH candidates are present and resource allocation indicates potential URLLC traffic). This avoids continuously prioritizing URLLC when there is no actual URLLC data, thereby reducing unnecessary resource consumption while still achieving low latency when needed.
Solution Approach 2:
The patent changes the parameter of resource allocation by using different RNTI values and DCI formats to indicate different service priorities. When URLLC is prioritized, specific parameter combinations (second RNTI, second DCI format) are used, allowing the system to switch between priority modes without permanently dedicating resources, thus maintaining efficiency while achieving low latency when required.
3Reliability
If the terminal performs blind decoding operation, then the URLLC data detection capability is improved, but the processing complexity increases
Solution Approach 1:
The patent applies preliminary action by configuring the terminal with predefined RNTI values and DCI format structures before actual data transmission. The terminal is pre-configured with the first RNTI for eMBB and second RNTI for URLLC, along with their respective DCI formats. This preliminary configuration reduces the complexity of blind decoding during operation, as the terminal only needs to check for specific pre-defined parameter patterns rather than analyzing all possible configurations.
Data Source
AI summary
A method for transmitting and receiving signals for ultra reliable low latency communication. A method of operating a terminal includes: receiving, from a base station, first DCI including resource allocation information of a first PDSCH; performing a blind decoding operation on a PDCCH candidate when a resource region of the first PDSCH indicated by the first DCI overlaps with a resource region of the PDCCH candidate; and performing a receiving operation of a downlink channel on the basis of a result of the blind decoding operation. Therefore, the performance of a communication system can be improved.