Type-1 HARQ-ACK Codebook Construction with Relative SLIV
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Solution Overview
Problem
The current 3GPP NR specification does not adequately account for varying PDCCH monitoring occasions across slots when constructing Type-1 HARQ-ACK codebooks, leading to inefficiencies in resource allocation and feedback mechanisms.
Innovation Solution
Configuring a wireless device with a new reference for the start and length indicator (SLIV) to derive a common set of time-domain resource allocation entries for Type-1 HARQ-ACK codebooks, allowing for flexible and slot-dependent PDCCH monitoring occasions, thereby optimizing HARQ-ACK feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a common set of time-domain resource allocation entries is used for Type-1 HARQ-ACK codebooks across all slots, then the codebook construction is simplified, but it cannot accommodate varying PDCCH monitoring occasions in different slots
Solution Approach 1:
The patent applies dynamics by making the set of time-domain resource allocation entries slot-dependent rather than static across all slots. Each slot can have its own customized set of entries that matches its specific PDCCH monitoring occasions, allowing the system to adapt dynamically to different slot configurations while maintaining systematic construction procedures.
Solution Approach 2:
The patent applies local quality by allowing different sets of time-domain resource allocation entries for different slots based on their specific monitoring occasion patterns. Instead of using a uniform common set everywhere, each slot receives locally optimized entries that match its particular configuration, improving adaptability without sacrificing overall system coherence.
2Manufacturing precision
If Type-1 HARQ-ACK codebook construction accounts for varying PDCCH monitoring occasions per slot, then resource allocation accuracy improves, but the complexity of codebook construction increases
Solution Approach 1:
The patent applies segmentation by dividing the codebook construction process into slot-specific segments. Each slot's HARQ-ACK codebook is constructed using its own dedicated set of time-domain resource allocation entries, which are tailored to that slot's monitoring occasions. This segmentation improves precision by matching resources to specific slot configurations while managing complexity through modular, independent construction for each slot.
Solution Approach 2:
The patent applies parameter changes by varying the set of time-domain resource allocation entries based on slot-specific parameters such as monitoring occasion patterns and slot types. By changing the parameters (different entry sets for different slots) rather than using fixed parameters, the system achieves higher resource allocation accuracy while the systematic approach to parameter variation keeps construction complexity manageable.
3Adaptability or versatility
If relative SLIV is used to indicate PDSCH time domain resources, then flexibility in scheduling is improved, but the existing Type-1 HARQ-ACK codebook construction cannot properly handle varying starting symbols
Solution Approach 1:
The patent applies dynamics by making the Type-1 HARQ-ACK codebook construction adaptive to the varying starting symbols indicated by relative SLIV. Instead of assuming fixed starting symbols, the construction process dynamically adjusts to accommodate different starting symbols based on the slot's specific PDCCH monitoring occasions, maintaining both scheduling flexibility and codebook construction reliability.
Solution Approach 2:
The patent applies local quality by allowing different codebook construction approaches for different slots based on their specific relative SLIV configurations. Each slot's codebook is constructed with local awareness of its starting symbol variations, ensuring reliable construction that respects the scheduling flexibility provided by relative SLIV while maintaining overall system consistency.
Data Source
AI summary
According to some embodiments, a method is performed by a wireless device capable of operating in a wireless network where physical downlink control channel (PDCCH) monitoring occasions vary by slot. The method comprises: obtaining a starting symbol S of a physical downlink shared channel (PDSCH), wherein S is relative to a reference symbol related to a PDCCH monitoring occasion where the PDSCH is scheduled; deriving a Type-1 hybrid automatic repeat request (HARQ) acknowledgement (ACK) codebook based on the starting symbol S; and transmitting to a network node one or more HARQ-ACKs based on the HARQ-ACK codebook.