PUCCH Format 0 HARQ Feedback Reliability via Preconfigured Sequences
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Solution Overview
Problem
In mobile communication systems, particularly in 5G applications, the reliability of identifying high-priority HARQ feedback bits on PUCCH format 0 sequences is compromised when downlink control information (DCI) is missed, leading to increased false detection rates and latency due to ambiguity in the number of HARQ feedback bits.
Innovation Solution
A method where user equipment processes and transmits PUCCH format 0 sequences based on a preconfigured mode, allowing network devices to determine the number and values of HARQ feedback bits, thereby identifying high-priority HARQ feedback bits reliably without additional resource overhead, even when DCI is missed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple HARQ feedback bits are multiplexed on the same PUCCH format 0 sequence, then resource utilization efficiency is improved, but reliability of identifying high-priority HARQ feedback bits deteriorates when DCI is missed
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with multiple PUCCH format 0 sequences through higher layer signaling before the actual HARQ feedback transmission. This allows the UE to prepare and select appropriate sequences in advance, ensuring reliable identification of high-priority HARQ feedback bits even when DCI is missed, while maintaining efficient resource utilization through multiplexing.
2Loss of time
If PUCCH format 0 sequence is used for HARQ feedback, then latency is reduced, but false detection rate increases due to ambiguity in number of HARQ feedback bits
Solution Approach 1:
The patent applies segmentation by dividing the HARQ feedback transmission into distinct components: multiple PUCCH format 0 sequences are allocated for different HARQ feedback bit combinations. This segmentation allows the network to clearly identify which sequence was transmitted and interpret the HARQ feedback bits unambiguously, reducing false detection rates while maintaining the low latency advantage of PUCCH format 0.
Solution Approach 2:
The patent uses color changes (sequence differentiation) by assigning different PUCCH format 0 sequences with distinct characteristics to represent different HARQ feedback scenarios. This allows the network to distinguish between various feedback conditions through sequence identification, eliminating ambiguity in detection while preserving the fast feedback mechanism.
3Reliability
If additional PUCCH sequences are configured for HARQ feedback, then reliability of feedback identification is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by making the PUCCH format 0 sequence serve multiple functions: the same sequence type is used for both normal HARQ feedback and for indicating missed DCI conditions. The sequences are configured to carry both HARQ feedback information and transmission status information, eliminating the need for separate dedicated sequences and reducing overall device complexity while maintaining high reliability.
Data Source
AI summary
A method for feeding back a hybrid automatic repeat request (HARQ), includes: when a first HARQ feedback bit for first DCI and a second HARQ feedback bit for second DCI issued by a network device need to be carried on a same PUCCH format 0 sequence, user equipment processes the PUCCH format 0 sequence based on a pre-configured mode, and transmits a processed PUCCH format 0 sequence to the network device.