PDCCH Over PDSCH Resources for 5G RACH Coverage
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Solution Overview
Problem
The limited coverage of message 2 (msg2) PDCCH in millimeter wave 5G systems restricts the coverage area due to its transmission in control resource sets (CORESET) with limited energy and time, necessitating an improvement in PDCCH coverage during random access channel (RACH) procedures.
Innovation Solution
Configuring the random access response (RAR) message to comprise physical downlink control channel (PDCCH) over physical downlink shared channel (PDSCH) resources, allowing for increased energy transmission and extended time for PDCCH transmission, thereby enhancing coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If PDCCH is transmitted in CORESET resources, then control channel functionality is maintained, but coverage area is limited due to restricted energy and time resources
Solution Approach 1:
The patent extracts the PDCCH transmission from the constrained CORESET resource structure and relocates it to PDSCH resources. This extraction allows the PDCCH to utilize the more abundant energy and time resources available in PDSCH, thereby resolving the contradiction between maintaining control channel functionality and expanding coverage area.
Solution Approach 2:
The patent changes the resource allocation parameters for PDCCH transmission by moving it from CORESET to PDSCH. This parameter change enables increased energy transmission and extended time duration for PDCCH, directly addressing the coverage limitation while maintaining the control channel's operational integrity.
2Area of stationary object
If PDCCH transmission time is limited in CORESET, then control channel structure is maintained, but coverage extension is restricted
Solution Approach 1:
The patent extracts PDCCH from the time-constrained CORESET structure and places it in PDSCH resources, which provide extended time duration for transmission. This extraction resolves the contradiction between maintaining control channel structure and achieving coverage extension through longer transmission time.
Solution Approach 2:
The patent introduces dynamic flexibility in PDCCH transmission timing by utilizing PDSCH resources that can accommodate variable time durations. This dynamic approach allows the system to extend transmission time for coverage enhancement while adapting to different traffic conditions and resource availability.
Data Source
AI summary
A configuration to allow a base station to improve coverage for PDCCH during a RACH procedure. The apparatus receives, from a UE, a preamble to initiate a RACH procedure. The apparatus transmits a RAR to the UE in response to receiving the preamble. The RAR comprises a PDCCH over PDSCH resources.