HARQ-ACK Codebook Construction for Cross-Carrier PUCCH Switching
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Solution Overview
Problem
Existing technologies face challenges in constructing a semi-static hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook, particularly when semi-static physical uplink control channel (PUCCH) carrier switching is configured, especially across cells with different slot lengths.
Innovation Solution
The proposed solution involves determining the position of overlapping time slots between cells and using these positions, along with a set of values associated with the primary cell, to construct a type1 HARQ-ACK codebook. This includes concatenating HARQ-ACK information from multiple cells based on ascending carrier indexes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semi-static PUCCH carrier switching is configured across cells with different slot lengths, then communication flexibility is improved, but HARQ-ACK codebook construction complexity increases
Solution Approach 1:
The patent segments the HARQ-ACK codebook construction process into distinct steps: identifying overlapping time slots between cells, determining slot associations based on carrier indexes, and separately handling HARQ-ACK information from different cells. This segmentation simplifies the overall complexity by breaking down the complex codebook construction into manageable sub-tasks that can be processed systematically.
Solution Approach 2:
The patent performs preliminary actions by pre-identifying and storing the set of values (K1 set) associated with the first cell before constructing the HARQ-ACK codebook. The overlapping time slot positions are determined in advance, and the association between time slots and carrier indexes is pre-established. This preliminary preparation reduces the computational burden during actual codebook construction and improves processing efficiency.
2Reliability
If HARQ-ACK information from multiple cells with different slot lengths is aggregated, then communication reliability is improved, but processing time increases
Solution Approach 1:
The patent changes the parameter representation by using a unified time slot identification mechanism that works across cells with different slot lengths. By referencing overlapping time slot positions and using carrier index-based association, the system transforms the problem from handling variable slot structures to managing a standardized set of time slot references, thereby reducing processing time while maintaining reliability.
3Manufacturing precision
If time slot overlap positions are determined between cells, then codebook construction accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent creates equipotentiality by establishing a common reference framework for time slot identification across different cells. By determining overlapping time slot positions and using carrier index associations, the system creates an equivalent reference system that allows accurate codebook construction without requiring complex cell-specific calculations, thereby improving accuracy while controlling computational complexity.
Data Source
AI summary
Techniques are described to construct a semi-static hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook. An example wireless communication method includes determining, by a communication device that is configured to communicate with a first cell and a second cell, a position of a first time slot associated with the first cell that overlaps with a second time slot associated with the second cell, where the second time slot is configured for a transmission of a hybrid automatic repeat request (HARQ) acknowledgement (ACK) information; determining, for the HARQ-ACK information, a plurality of time slots associated with the first cell and the second cell based on the position of the first time slot and a set of values associated with the first cell; and transmitting, by the communication device, the HARQ-ACK information for the plurality of time slots in the second time slot to the second cell.