PDCCH Initialization for Low-Complexity MTC Devices
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Solution Overview
Problem
Low-complexity MTC devices in LTE systems face challenges in initializing the physical downlink control channel due to limited bandwidth, as existing procedures rely on PDCCH, which they cannot receive.
Innovation Solution
The method involves transmitting a system information block or random access response configured for low-complexity UEs, providing frequency and time-domain configurations for the physical downlink control channel, allowing these devices to initialize and operate the channel effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing PDCCH initialization procedures are used, then regular UEs can initialize the physical downlink control channel, but low-complexity MTC devices cannot receive PDCCH due to limited bandwidth
Solution Approach 1:
The patent segments the initialization procedure into two distinct paths: one for regular UEs using traditional PDCCH, and another for low-complexity MTC devices using system information blocks or random access responses. This segmentation allows each device type to receive appropriate initialization information through channels suitable for their capabilities.
Solution Approach 2:
The patent introduces system information blocks and random access responses as intermediary carriers to deliver PDCCH configuration information to low-complexity MTC devices. These intermediaries bridge the gap between legacy LTE infrastructure and devices with limited bandwidth capabilities, enabling initialization without direct PDCCH reception.
2Reliability
If system information blocks are transmitted to provide frequency and time-domain configurations, then low-complexity UEs can initialize the physical downlink control channel, but network complexity increases
Solution Approach 1:
The patent makes system information blocks serve multiple functions: they provide both general system information and specific PDCCH configuration parameters for low-complexity MTC devices. By embedding initialization parameters within existing system information structures, the network avoids creating entirely new signaling mechanisms, thereby limiting complexity growth.
3Productivity
If dedicated random access responses are configured for low-complexity UEs, then initialization performance is improved, but signaling overhead increases
Solution Approach 1:
The patent merges PDCCH configuration information with random access response messages. By combining initialization parameters with the existing random access procedure, the system delivers configuration data without requiring separate dedicated signaling exchanges, thereby improving initialization speed while controlling signaling overhead through efficient message packing.
Data Source
AI summary
The present disclosure concerns radio communication. More particularly, the present disclosure inter alia introduces techniques to allow low-complexity UEs 120a-j, e.g. Rel-3 MTC devices, to operate in a legacy LTE system with maintained, or improved, performance.