PDSCH Scheduling Assignment Handling for HARQ Process Ambiguity
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Solution Overview
Problem
In the context of 3GPP New Radio (NR) communication, there is an ambiguity in how a User Equipment (UE) should handle receiving two Physical Downlink Shared Channels (PDSCH) with the same Hybrid Automatic Repeat Request (HARQ) process identifier, leading to issues in determining which PDSCH to store in the HARQ buffer and which Physical Uplink Control Channel (PUCCH) resource to use for feedback.
Innovation Solution
The proposed solution provides rules and configurations for the UE to prioritize and manage multiple PDSCH scheduling assignments with the same HARQ process, allowing it to select the appropriate PUCCH resource for HARQ feedback based on declared capabilities and RRC configuration, thereby resolving ambiguities and enhancing transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network schedules both group (PTM) and point-to-point (PTP) transmissions with the same HARQ process identifier, then transmission reliability is improved through redundancy, but the UE complexity increases due to ambiguity in handling multiple PDSCH scheduling assignments
Solution Approach 1:
The patent segments the PDSCH scheduling assignments into different types (first PDSCH scheduling assignment and second PDSCH scheduling assignment) based on their source and characteristics. This segmentation allows the UE to distinguish between group and point-to-point transmissions and apply appropriate processing rules for each type, resolving the ambiguity in handling multiple assignments with the same HARQ process identifier.
Solution Approach 2:
The patent applies different processing rules and priorities to different PDSCH scheduling assignments based on their local characteristics. The first PDSCH scheduling assignment (group transmission) and second PDSCH scheduling assignment (point-to-point transmission) are treated differently in terms of HARQ buffer allocation and feedback mechanisms, allowing optimized processing for each specific case rather than uniform treatment.
2Reliability
If the UE processes multiple PDSCH scheduling assignments with the same HARQ process identifier, then transmission reliability is enhanced through combining multiple transmissions, but the ambiguity in determining which PDSCH to store in HARQ buffer increases processing difficulty
Solution Approach 1:
The patent establishes preliminary rules and configurations before the UE receives multiple PDSCH scheduling assignments. The network configures the UE with identification information and processing rules in advance, enabling the UE to automatically determine which PDSCH to store in the HARQ buffer and which PUCCH resource to use for feedback without experiencing ambiguity during real-time processing.
3Reliability
If the network schedules multiple repetitions of transmission over consecutive slots with the same HARQ process, then reliability is improved through combining, but the scheduling complexity increases when assigning redundancy versions to multiple PDSCH
Solution Approach 1:
The patent creates a universal HARQ process identifier that can be used across different PDSCH scheduling assignments (both group and point-to-point transmissions). This multi-functional approach allows the same HARQ process identifier to manage multiple transmissions with different characteristics, simplifying the scheduling complexity while maintaining reliability through combining multiple repetitions over consecutive slots.
Data Source
AI summary
Methods of operating a User Equipment, UE, in a communication network are provided. Operations according to such methods include receiving a first physical downlink shared channel, PDSCH, scheduling assignment including a first hybrid automatic repeat request, HARQ, process identifier and a second PDSCH scheduling assignment that includes the first HARQ process identifier. Operations further include determining which of the first PDSCH scheduling assignment and the second PDSCH scheduling assignment to process.