PDCCH Random Access Signaling for Reduced-Capability 5G UEs
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Solution Overview
Problem
The existing 5G NR system is not designed to meet the requirements of reduced capability UEs, such as low cost, low complexity, and power saving, which are necessary for mid-end Internet of Things devices, and the current MTC and NB-IoT technologies in LTE cannot support the higher data rates and lower latency needed for services like video surveillance and industrial sensor monitoring.
Innovation Solution
The method involves sending PDCCH signaling specific to the type of UE, carrying random access response control information, to meet different transmission requirements and reduce coupling between UEs, improving communication efficiency and flexibility by using distinct PDCCH signalings for different types of UEs, including configuring different CORESETs, search spaces, CCE resources, and random access response windows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the current 5G NR system is used for high-end terminals, then high-speed and low-latency requirements are met, but reduced capability UE requirements (low cost, low complexity, power saving) cannot be satisfied
Solution Approach 1:
The patent segments the random access response transmission by introducing separate PDCCH signaling types (first type and second type) for different UE categories. Reduced capability UEs use the first type PDCCH signaling with simplified parameters, while other UEs use the second type, allowing each UE type to operate with appropriate complexity levels
Solution Approach 2:
The patent applies local quality by configuring different parameter sets for different UE types. The first PDCCH signaling uses first parameter sets optimized for reduced capability UEs (lower complexity), while the second PDCCH signaling uses second parameter sets for other UEs, allowing each UE to receive locally optimized transmission parameters matching its capabilities
2Use of energy by moving object
If MTC and NB-IoT technologies are used for low-speed scenarios, then low-cost and power-saving requirements are met, but higher data rates and lower latency requirements cannot be satisfied
Solution Approach 1:
The patent introduces dynamic parameter configuration where the base station can flexibly select and indicate different parameter sets (first or second) for random access response transmission based on UE type and service requirements. This dynamic adaptation allows the system to optimize between power consumption and data rate/latency performance
3Device complexity
If a unified PDCCH signaling is used for all UEs, then system complexity is reduced, but transmission flexibility and communication efficiency for different UE types deteriorate
Solution Approach 1:
The patent implements universality by designing a unified PDCCH signaling framework that can carry both first type and second type signaling. The same physical channel structure serves multiple UE types by dynamically indicating different parameter sets, achieving multi-functionality without requiring completely separate signaling paths
Data Source
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AI summary
The embodiments of the present disclosure relate to an information transmission method and apparatus, and a communication device and a storage medium. The method comprises: sending, according to the type of a user equipment (UE), physical downlink control channel (PDCCH) signaling corresponding to the type of the UE, wherein the PDCCH signaling carries random access response control information for the UE; different UE types correspond to different instances of PDCCH signaling transmission; and the random access response control information is used for indicating scheduling information associated with a random access response.