HARQ-ACK Codeword Determination via DAI Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing high mobile data traffic and supporting new applications due to limitations in radio interface efficiency and coverage, particularly in carrier aggregation operations.
Innovation Solution
The method involves determining a codeword of acknowledgement information through the reception and transmission of control signaling that conveys downlink control information, using counter and total Downlink Assignment Indicator (DAI) fields to efficiently schedule and acknowledge physical downlink shared channel receptions or releases across multiple cells and transmission time intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation operation is used to support high mobile data traffic, then network capacity and data rate are improved, but radio interface efficiency and coverage management become more complex
Solution Approach 1:
The patent segments the acknowledgement information into multiple codebooks, with each codebook corresponding to a specific cell or carrier. This segmentation allows the system to manage multiple cells independently, reducing the complexity of radio interface efficiency management while maintaining high network capacity through carrier aggregation.
Solution Approach 2:
The patent introduces a new dimension for organizing acknowledgement information by using codebook indices that correspond to specific cells or carriers. This dimensional organization allows the system to efficiently manage radio interface resources across multiple cells without linearly increasing complexity, as the codebook structure provides a systematic way to handle the additional dimensions introduced by carrier aggregation.
2Adaptability or versatility
If multiple DCI formats are used to schedule PDSCH receptions across multiple cells and TTIs, then scheduling flexibility is improved, but the complexity of tracking and acknowledging receptions increases
Solution Approach 1:
The patent segments the scheduling and acknowledgement process by associating each DCI format with a specific codebook and codebook index. This segmentation allows the UE to track PDSCH receptions across multiple cells and TTIs by maintaining separate codebooks for different cell groups, reducing the overall tracking complexity while preserving scheduling flexibility.
Solution Approach 2:
The patent introduces codebook indices as intermediaries between DCI formats and acknowledgement information. These indices serve as a mapping mechanism that simplifies the tracking process by providing a direct reference from each DCI format to its corresponding codebook entry, reducing the complexity of managing multiple scheduled receptions across different cells and time intervals.
3Measurement precision
If counter DAI and total DAI fields are implemented to count DCI formats, then acknowledgement accuracy is improved, but the overhead of control signaling increases
Solution Approach 1:
The patent segments the DAI counting mechanism by implementing separate counter DAI and total DAI fields within the DCI format structure. This segmentation allows for precise tracking of DCI formats across multiple cells and TTIs while organizing the overhead in a structured manner that minimizes redundancy and optimizes the use of control signaling resources.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method performed by a terminal in a communication system, the method comprising: receiving, from a base station, information on a threshold value associated with a physical uplink control channel, PUCCH; receiving, from the base station, one or more downlink control information, DCI, formats for scheduling respective one or more downlink data, wherein each of the one or more DCI format include at least one downlink assignment index, DAI; receiving, from the base station, the respective one or more downlink data; identifying a payload of hybrid automatic repeat request acknowledgement, HARQ-ACK, information corresponding to the one or more downlink data based on the at least one DAI of the one or more DCI formats; identifying a PUCCH resource based on the payload of the HARQ-ACK information payload and the threshold value; and transmitting, to the base station, the HARQ-ACK information on the identified PUCCH resource.