HARQ Codebook Retransmission Across PUCCH and PUSCH
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing hybrid automatic repeat request (HARQ) feedback retransmissions across different channel types, leading to inefficiencies and potential losses in data transmission quality.
Innovation Solution
Implementing methods and apparatuses for HARQ feedback retransmission that utilize HARQ codebooks based on the characteristics of both a first and a second channel type, allowing for optimized retransmission strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is transmitted using a single channel type, then the transmission process is simple, but the reliability is reduced due to channel-specific conditions causing feedback loss
Solution Approach 1:
The patent implements dynamic HARQ feedback retransmission where the UE adapts its feedback transmission strategy based on channel conditions. The network node can trigger retransmission on different channel types (PUCCH or PUSCH) depending on the initial transmission outcome, making the system flexible and adaptive to varying channel conditions rather than using a fixed single-channel approach
Solution Approach 2:
The patent introduces an intermediary indication mechanism from the network node to the UE. When the initial HARQ feedback transmission fails or is not acknowledged, the network node sends a retransmission indication that mediates the retransmission process, allowing the UE to retransmit on an alternative channel type without requiring complex autonomous decision-making at the UE side
2Reliability
If HARQ feedback retransmission is implemented without channel-specific adaptation, then the system operation is simple, but the data transmission quality deteriorates due to channel conditions
Solution Approach 1:
The patent applies local quality by adapting HARQ feedback transmission to channel-specific conditions. Different channel types (PUCCH for uplink control, PUSCH for uplink data) have different characteristics and reliability profiles. The system selects the appropriate channel type based on the specific transmission context and channel conditions, rather than using a uniform approach for all feedback transmissions
Solution Approach 2:
The system dynamically adjusts HARQ feedback behavior based on channel conditions and transmission outcomes. The network node monitors the initial feedback transmission and dynamically triggers retransmission on alternative channels when needed, allowing the system to respond to changing channel conditions without requiring complex autonomous operation at the UE side
3Productivity
If HARQ feedback is retransmitted on the same channel type, then the implementation is straightforward, but the efficiency is reduced due to potential channel congestion or poor conditions
Solution Approach 1:
The patent implements dynamic channel selection for HARQ feedback retransmission. Instead of fixed retransmission on the same channel type, the system dynamically switches between PUCCH and PUSCH based on initial transmission outcomes and channel conditions. This dynamic approach improves efficiency by avoiding retransmission on congested or poor-quality channels
Solution Approach 2:
The patent makes the HARQ feedback mechanism multi-functional by supporting transmission on multiple channel types (PUCCH and PUSCH). The same HARQ feedback information can be transmitted on different channel types depending on conditions, making the system universal and adaptable rather than limited to a single channel type
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication to retransmit hybrid automatic repeat request (HARQ) feedback associated with an initial transmission on a first channel. The UE may transmit a HARQ codebook associated with the HARQ feedback on a second channel, wherein the HARQ codebook is based at least in part on at least one of: a first channel type of the first channel, or a second channel type of the second channel. Numerous other aspects are described.