PDSCH Timing Gap Control for SI Message Soft Combining
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In New Radio (NR) wireless communication networks, there is a challenge in ensuring sufficient timing gaps between consecutive Physical Downlink Shared Channel (PDSCH) transmissions for the same System Information (SI) message to allow user equipment (UE) enough time to process and perform soft combining, given the restrictions on HARQ process IDs and the absence of HARQ-ACK for SI message re-transmissions.
Innovation Solution
The proposed solution involves determining a timing gap between the first and second PDSCH transmissions and ignoring or decoding the second transmission based on whether this gap is greater than a predetermined processing time, which is defined according to UE capability and PDSCH configurations, to prevent decoding failure and allow for successful soft combining of SI messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If re-transmission of PDSCH for SI message is performed without HARQ-ACK feedback, then transmission reliability is improved, but timing gap between consecutive PDSCH transmissions becomes insufficient for UE processing
Solution Approach 1:
The patent changes the timing parameter by defining a minimum gap between consecutive PDSCH transmissions carrying the same SI message. This parameter adjustment ensures that UE has sufficient processing time between receptions while maintaining the re-transmission mechanism for improved reliability.
Solution Approach 2:
The patent applies preliminary action by having the network node proactively schedule PDSCH transmissions with pre-calculated timing gaps that account for UE processing requirements. This prevents timing conflicts before they occur, ensuring reliable SI message delivery without compromising processing time.
2Reliability
If consecutive PDSCH transmissions for same SI message are received, then transmission redundancy is improved, but UE processing capability is exceeded
Solution Approach 1:
The patent adjusts the timing parameter between consecutive PDSCH transmissions to match UE processing capabilities. By setting an appropriate minimum gap, the system maintains transmission redundancy while preventing the UE from being overwhelmed by consecutive transmissions it cannot process.
3Productivity
If PDSCH re-transmission is scheduled without considering UE processing time, then network resource utilization is improved, but decoding failure rate increases
Solution Approach 1:
The patent optimizes the timing parameter by establishing a minimum gap between PDSCH transmissions. This parameter change balances network resource utilization with successful decoding, preventing scheduling conflicts that would cause decoding failures while maintaining efficient resource usage.
Solution Approach 2:
The patent incorporates implicit feedback by monitoring decoding outcomes and adjusting PDSCH scheduling decisions. When decoding failures occur, the system responds by ensuring adequate timing gaps in subsequent transmissions, creating a feedback loop that improves overall decoding success rate.
Data Source
AI summary
Various solutions for re-transmission of system information (SI) message with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a first physical downlink shared channel (PDSCH) from a network node. The apparatus may receiving a second PDSCH from the network node. The apparatus may determine whether a timing gap between the first PDSCH and the second PDSCH is less than a predetermined processing time. The apparatus may ignore the second PDSCH in an event that the timing gap is less than the predetermined processing time.