HARQ Feedback Determination via DAI in 5G Multi-Time Unit Scheduling
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Solution Overview
Problem
In the context of 5G wireless communications, the introduction of network slicing and multi-time-unit scheduling in NR technology poses a challenge in designing HARQ feedback information to ensure understanding consistency between the transmit end and the receive end, especially when dealing with a flexible quantity of aggregated time units.
Innovation Solution
A method for determining feedback information is provided, where a receive end device obtains control information from a transmit end device, including time unit aggregation information and DAI indication information. Based on this information, the receive end device determines the feedback information for at least one transport block and sends it back to the transmit end device, ensuring consistent bit quantities and decoding results across aggregated time units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-time-unit scheduling is introduced to reduce control overheads, then scheduling efficiency is improved, but understanding consistency between transmit end and receive end deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining the codebook structure and bit quantity rules before multi-time-unit scheduling occurs. The receive end device uses pre-configured rules to determine feedback information bit quantities based on DAI values, ensuring both transmit and receive ends understand the feedback structure in advance, thus maintaining consistency while enabling flexible scheduling.
Solution Approach 2:
The patent uses parameter changes by dynamically adjusting the feedback information bit quantity based on the DAI (Downlink Assignment Index) value. When the DAI value changes, the bit quantity of feedback information is adjusted accordingly, allowing the system to adapt to different scheduling scenarios while maintaining a consistent determination mechanism between transmit and receive ends.
2Adaptability or versatility
If flexible quantity of aggregated time units is supported, then adaptability is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by creating a unified feedback determination mechanism that works across different numbers of aggregated time units. The same codebook structure and DAI-based bit quantity determination rules are used regardless of whether 1, 2, or more time units are aggregated, eliminating the need for separate handling logic for each scenario and reducing overall system complexity.
Solution Approach 2:
The patent implements dynamics by allowing the feedback information bit quantity to dynamically adjust based on the actual number of aggregated time units through the DAI parameter. This dynamic adjustment mechanism provides flexibility to support variable numbers of aggregated time units while maintaining a consistent and manageable system structure through a single adaptive rule set.
3Measurement precision
If DAI indication information is used to determine feedback bit quantity, then measurement precision is improved, but information overhead increases
Solution Approach 1:
The patent uses DAI (Downlink Assignment Index) as an intermediary parameter that indirectly controls the feedback bit quantity. Instead of directly signaling the bit quantity, the system uses the DAI value as a mediator that both transmit and receive ends use to independently determine the appropriate feedback size, reducing direct overhead while maintaining precise control through the intermediary DAI parameter.
Data Source
AI summary
Embodiments of this application provide a method for processing information bits in a wireless communication network. A communication device receives a radio resource control (RRC) signaling, wherein the RRC signaling comprises time window information and time unit format information, wherein the time window information comprises a hybrid automatic repeat request (HARQ) time sequence K1 set, wherein K1 is a time relationship between a time unit of a physical downlink shared channel (PDSCH) and a time unit of a physical uplink control channel (PUCCH), or wherein the K1 is a time relationship between a time unit of a (PDSCH) and a time unit of a physical uplink shared channel (PUSCH). The device determines HARQ feedback information based on the time window information and the time unit format information and sends the HARQ feedback information.