DAI Counter Ordering for Consistent HARQ-ACK Codebooks
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Solution Overview
Problem
In the 5G NR system, determining the order of HARQ-ACKs for multiple PDCCHs transmitted within one monitoring occasion is challenging, especially when these PDCCHs schedule multiple PDSCHs across different component carriers, leading to inconsistencies in HARQ-ACK codebooks between base stations and terminals.
Innovation Solution
An information counting method and apparatus that determine the order of values for DAI counter fields in PDCCHs based on the indexes of serving cells to which the PDSCHs belong, ensuring consistent HARQ-ACK codebook ordering across multiple component carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PDCCHs are transmitted within one monitoring occasion to schedule multiple PDSCHs across different component carriers, then the scheduling efficiency and resource utilization are improved, but the inconsistency in HARQ-ACK codebook ordering between base station and terminal occurs
Solution Approach 1:
The patent changes the ordering parameter from time-domain based to serving cell index based. Specifically, when multiple PDCCHs are transmitted within one monitoring occasion, the HARQ-ACKs are ordered according to the serving cell indexes rather than transmission time order, ensuring consistent ordering between base station and terminal while maintaining high scheduling efficiency
Solution Approach 2:
The patent establishes predetermined rules for DAI counter field value assignment before actual HARQ-ACK transmission. The base station and terminal agree in advance on the ordering rule (based on serving cell indexes), so that both sides can independently generate consistent HARQ-ACK codebooks without real-time coordination, preventing ordering inconsistencies
2Quantity of substance
If HARQ-ACKs of multiple PDSCHs scheduled by multiple PDCCHs within one monitoring occasion are placed in one HARQ-ACK codebook, then the feedback overhead is reduced, but the problem of determining the order of DAI counter field values arises
Solution Approach 1:
The patent changes the ordering criterion from complex multi-dimensional parameters (time, frequency, carrier) to a simple single parameter (serving cell index). This allows HARQ-ACKs to be efficiently ordered in a single codebook while keeping the DAI counter assignment rule simple and deterministic, avoiding ordering conflicts
Solution Approach 2:
Instead of ordering PDCCHs by their transmission time or frequency position and assigning DAI counters sequentially, the patent inverts the approach by ordering according to serving cell indexes first, then assigning DAI counter values based on this inverted order. This ensures that even if PDCCHs are transmitted in different time/frequency positions, the HARQ-ACK ordering remains consistent
Data Source
AI summary
Disclosed in the present application are an information counting method, an information counting apparatus, a base station, and a computer storage medium. The information counting method includes: determining multiple PDCCHs which are transmitted within one MO of a serving cell and used for scheduling multiple PDSCHs, where HARQ-ACKs of the multiple PDSCHs are transmitted in one HARQ-ACK codebook; and determining, according to an order of indexes of serving cells to which the multiple PDSCHs belong, an order of values assigned to DAI counter fields in the multiple PDCCHs corresponding to the multiple PDSCHs.