Terminal HARQ Codebook Determination via DAI
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Solution Overview
Problem
The existing methods for transmitting multiplexed HARQ feedback in NR-V2X systems are unclear regarding the method of counting the Downlink Assignment Indicator (DAI) included in the downlink control information that schedules the resource for transmission.
Innovation Solution
A terminal is configured to receive multiple DL control information items for scheduling DL, UL, and SL resources, and to multiplex HARQ responses corresponding to DL and SL data. The terminal determines a HARQ codebook based on the DAI included in the DL control information that schedules the UL resource, allowing for the transmission of multiplexed HARQ feedback to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple DL control information items schedule both DL and SL resources, then the terminal can transmit multiplexed HARQ feedback efficiently, but the method for counting DAI becomes unclear
Solution Approach 1:
The patent segments the DAI counting process into separate components: one DAI counter for DL data and another for SL data. This segmentation allows each type of data to be counted independently, resolving the ambiguity that arises when trying to count both types together in a single DAI value.
Solution Approach 2:
The patent introduces an intermediary mechanism where the terminal determines the total number of DL control information items based on the DAI value, and uses this information to separately identify how many items scheduled DL data versus SL data. This intermediary step clarifies the counting process without losing information.
2Adaptability or versatility
If the terminal multiplexes HARQ responses for both DL and SL data, then resource utilization improves, but the complexity of determining the HARQ codebook increases
Solution Approach 1:
The patent applies preliminary action by having the terminal determine the total number of DL control information items before constructing the HARQ codebook. The terminal uses the DAI value to pre-calculate how many DL and SL data items need to be acknowledged, which simplifies the subsequent codebook construction process.
Solution Approach 2:
The patent changes the parameter representation by using the DAI value not just as a simple counter but as a structured indicator that encodes information about the number of DL and SL resources. This parameter transformation allows the terminal to derive multiple pieces of information from a single DAI value, reducing overall complexity.
Data Source
AI summary
A terminal includes a reception unit that receives, from a base station, a plurality of DCIs for scheduling a DL resource, an UL resource, and an SL resource, and DL data transmitted in a DL resource scheduled by the DCI, a transmission unit that multiplexes a HARQ response corresponding to the DL data, and a HARQ response corresponding to at least one of the SL resource or SL data that is transmitted in the SL resource, and transmits the multiplexed HARQ response to the base station via a UL shared channel in the UL resource scheduled by the DCI, and a control unit that determines a HARQ codebook, based on a DAI included in the DCI that schedules the UL resource, among the plurality of DCIs, and the DAI is assumed to be determined based on specific DCI among the plurality of DCIs.