Uplink Control Information Transmission via HARQ-ACK Resource Mapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in LTE and NR, there is a challenge in accurately decoding HARQ-ACK information due to miss detection of PDCCH, leading to incorrect feedback and failure in receiving the second PDSCH, as existing mechanisms fail to distinguish between different HARQ-ACK states correctly.
Innovation Solution
The proposed method involves determining the channel resource corresponding to HARQ-ACK information based on a preconfigured or dynamically indicated mapping relationship, ensuring that the network device correctly interprets the HARQ-ACK feedback by associating specific channel resources with ACK and NACK states, thereby ensuring accurate retransmission of the second PDSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PUCCH transmission mechanism based on sequence selection is introduced to enhance receiving performance of 1-bit or 2-bit HARQ-ACK, then the receiving performance is improved, but it becomes difficult to distinguish between different HARQ-ACK states (ACK vs. NACK) when PDCCH miss detection occurs
Solution Approach 1:
The patent segments the HARQ-ACK feedback mechanism into two independent components: PUCCH resource selection (for reliability) and PDCCH detection status (for accuracy). By separately tracking whether PDCCH was detected and which PUCCH resource was selected, the system can distinguish between ACK and NACK even when using sequence selection, resolving the contradiction between receiving performance and decoding accuracy.
2Loss of time
If transmission time period of PUCCH is shortened from subframe level to slot level or symbol level to reduce latency, then the latency is reduced, but the PUCCH transmission mechanism becomes more complex requiring sequence selection
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple PUCCH resources with different time durations and sequence lengths before transmission. The terminal device selects the appropriate pre-configured resource based on the actual transmission needs, avoiding complex real-time decisions and reducing the complexity of the transmission mechanism while maintaining short latency.
3Quantity of substance
If NACK and {NACK, NACK} correspond to the same PUCCH resource to save reserved PUCCH resources, then resource overhead is reduced, but the network device cannot correctly decode HARQ-ACK information when PDCCH miss detection occurs
Solution Approach 1:
The patent introduces an intermediary mechanism: the PDCCH detection status indicator. This indicator acts as a mediator between the terminal device and network device, providing additional context about whether PDCCH was detected. Combined with PUCCH resource selection, this intermediary allows the network device to correctly interpret HARQ-ACK information even when multiple states share the same PUCCH resource, maintaining reliability while reducing resource overhead.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Embodiments of this application provide an uplink control information transmission method and an apparatus. A terminal device determines, based on HARQ-ACK information and a mapping relationship, a channel resource corresponding to the HARQ-ACK information, where a channel resource corresponding to an ACK and a channel resource corresponding to {ACK, NACK} in the mapping relationship are the same. The terminal device generates an uplink signal based on the channel resource corresponding to the HARQ-ACK information, and sends the uplink signal. When a first PDSCH is correctly received and detection of a second PDCCH is missed, the terminal device sends the uplink signal to a network device based on the channel resource corresponding to the ACK. Because the network device sends two PDCCHs to the terminal device, the network device may determine that a quantity of HARQ-ACK information bits corresponding to the channel resource is 2. In this way, the network device can determine, based on the channel resource corresponding to the ACK and the quantity of HARQ-ACK information bits corresponding to the channel resource, that the HARQ-ACK information fed back by the terminal device is the {ACK, NACK}, and then can retransmit a second PDSCH, thereby ensuring that the terminal device can correctly receive the second PDSCH.