HARQ-ACK and SR PUCCH Overlap Handling in 5G
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Solution Overview
Problem
The existing wireless communication technologies face challenges in handling full or partial overlapping between Physical Uplink Control Channel (PUCCH) resources carrying Hybrid Automatic Repeat Request-Acknowledge (HARQ-ACK) and Scheduling Request (SR) transmissions, particularly in 5G communication, where resource allocation is flexible and collisions frequently occur, leading to unclear prioritization of SR configurations.
Innovation Solution
A method is introduced to configure separate PUCCH resources for HARQ-ACK and SR transmissions, determining overlaps in the time domain, and dropping the overlapped parts of either transmission to resolve collisions, which may involve dropping the whole or partial SR transmission, appending SR information to HARQ-ACK, or adjusting transmission start positions to manage overlapping scenarios effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible PUCCH resource allocation is introduced to allow PUCCH format 0 and 2 transmission to start from any symbol 0-13 and PUCCH format 1, 3 and 4 transmission to start from any symbol 0-11, then resource allocation flexibility and adaptability are improved, but overlapping between PUCCH resources carrying HARQ-ACK and SR occurs frequently, causing transmission conflicts
Solution Approach 1:
The patent segments the PUCCH resource allocation by introducing separate configuration parameters for HARQ-ACK and SR transmissions. Specifically, it divides the time-domain resources into distinct starting symbol positions and length parameters for different PUCCH formats, allowing independent configuration of HARQ-ACK and SR resources to avoid overlapping while maintaining overall flexibility
Solution Approach 2:
The patent implements dynamic resource allocation by allowing the network to flexibly configure PUCCH resources based on actual traffic conditions. The configuration includes dynamic adjustment of starting symbols, resource lengths, and PUCCH formats according to the specific requirements of HARQ-ACK and SR transmissions, enabling the system to adapt to varying channel conditions and traffic patterns without fixed resource assignments
2Reliability
If basic agreements are made to address full overlapping between PUCCH resources carrying HARQ-ACK and SR, then some collision scenarios are resolved, but further issues remain unsolved such as prioritization among multiple SR configurations and partial overlapping scenarios
Solution Approach 1:
The patent applies local quality by introducing configuration-specific prioritization rules for different SR configurations. Each SR configuration can be assigned different priority levels and handling rules based on local requirements, allowing the system to differentiate between various SR types (e.g., periodic SR, event-triggered SR) and apply appropriate prioritization strategies without requiring complex global arbitration mechanisms
Solution Approach 2:
The patent implements preliminary action by pre-configuring prioritization rules and resource allocation parameters before transmissions occur. The network configures multiple SR configurations with predefined priorities, offsets, and resource associations in advance, so that when overlaps occur, the UE can automatically apply the pre-established rules without requiring complex real-time decision-making or additional signaling
3Reliability
If separate PUCCH resources are configured for HARQ-ACK and SR transmissions with flexible time-domain allocation, then transmission reliability is improved, but determining and managing overlapping scenarios requires additional complexity in resource configuration and collision handling
Solution Approach 1:
The patent manages complexity through parameter changes by introducing a set of configurable parameters including starting symbol positions, resource lengths, PUCCH formats, and priority levels. These parameters can be adjusted based on traffic conditions, channel quality, and network requirements, allowing the system to optimize resource allocation and simplify collision handling by changing parameters rather than redesigning the entire resource management framework
Data Source
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AI summary
The present disclosure is directed to a method and apparatus for HARQ-ACK and SR transmission. According to an embodiment of the present disclosure, a method may include: configuring a first PUCCH resource for a HARQ-ACK transmission and a second PUCCH resource for a SR transmission; determining whether the HARQ-ACK transmission in the first PUCCH resource overlaps with the SR transmission in the second PUCCH resource in time domain; and in response to that the HARQ-ACK transmission in the first PUCCH resource overlaps with the SR transmission in the second PUCCH resource, at least dropping the exactly overlapped part of one of the HARQ-ACK transmission in the first PUCCH resource and the SR transmission in the second PUCCH resource.