PDCCH Random Access Signaling for Different UE Types
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Solution Overview
Problem
The existing 4G and 5G NR cellular mobile communication systems struggle to meet the low-cost, low-complexity, and power-saving requirements of reduced capability UEs, particularly in scenarios requiring mid-range data rates and low latency, such as video surveillance and industrial sensor monitoring, due to limitations in PDCCH signaling flexibility for different types of UEs.
Innovation Solution
The method involves sending and receiving PDCCH signaling tailored to the specific type of UE, using distinct PDCCH signalings for different types of UEs, including different CORESETs, search spaces, CCE resources, and random access response windows, to accommodate varying data transmission and reception capabilities, thereby improving flexibility and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the current 5G NR system is used for high-end terminals, then high-speed and low-latency requirements are met, but it cannot meet the requirements for reduced capability UE with low cost, low complexity, and power saving
Solution Approach 1:
The patent segments the random access response transmission by introducing separate PDCCH search spaces for different UE types. Reduced capability UEs use a first PDCCH search space while other UEs use a second PDCCH search space, allowing the system to serve multiple UE types without increasing overall complexity through modular separation of control channels.
Solution Approach 2:
The patent applies local quality by configuring UE-specific parameters including different search space sets, monitoring occasions, and aggregation levels tailored to each UE type's capabilities. This allows each UE type to receive optimized control information locally adapted to its requirements without affecting other UEs.
2Reliability
If different PDCCH signalings are sent to different UE types, then transmission flexibility and success rate are improved, but coupling between different UE types increases
Solution Approach 1:
The patent reduces coupling by segmenting the control information into UE-type-specific PDCCH search spaces. Each search space contains only the control information relevant to its target UE type, eliminating the need for other UEs to process irrelevant control information and thereby reducing inter-UE coupling while improving reliability through dedicated optimization.
Data Source
AI summary
An information transmission method is applied to a base station, and includes: sending a physical downlink control channel (PDCCH) signaling corresponding to a type of a user equipment (UE) according to the type of the UE; wherein the PDCCH signaling carries random access response control information for the UE; wherein different types of UEs correspond to different PDCCH signalings, and the random access response control information is configured to indicate scheduling information associated with a random access response.