HARQ-ACK Feedback Routing Across Multiple 5G Transmission Points
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting Hybrid Automatic Repeat request Acknowledgement (HARQ-ACK) feedback information to multiple transmission points or beams for network coordination, particularly in 5G communication systems supporting IoT applications, which require improved uplink data transmission schemes.
Innovation Solution
A method and apparatus for a User Equipment (UE) to transmit HARQ-ACK feedback information to multiple transmission points or beams through an uplink, utilizing physical downlink control channels and physical uplink control channels based on control resource sets and search space sets, enabling efficient network coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If HARQ-ACK feedback is transmitted to multiple transmission points using existing wireless communication systems, then network coordination capability is improved, but system complexity and resource overhead increase significantly
Solution Approach 1:
The patent segments the HARQ-ACK feedback transmission by introducing separate PUCCH resources for different transmission points. Each transmission point is assigned a specific PUCCH resource identifier, allowing the UE to transmit feedback to multiple transmission points independently without overwhelming system complexity. This segmentation enables scalable network coordination while maintaining manageable system architecture.
Solution Approach 2:
The patent adds a new dimension to HARQ-ACK feedback by introducing a PUCCH resource indicator field in DCI format 1_1 and 1_2. This additional dimension allows the system to distinguish between different transmission points without fundamentally redesigning the existing feedback mechanism, thereby improving versatility while controlling complexity.
2Reliability
If multiple PUCCH resources are allocated for HARQ-ACK feedback to different transmission points, then feedback reliability is improved, but uplink resource overhead increases
Solution Approach 1:
The patent makes the PUCCH resource configuration universal by using a common PUCCH resource indicator field in multiple DCI formats (1_1 and 1_2). This multi-functional approach allows the same mechanism to serve multiple transmission points, improving feedback reliability while avoiding the need for separate dedicated resources for each transmission point, thus controlling resource overhead.
Solution Approach 2:
The patent changes the parameter structure by introducing a 3-bit PUCCH resource indicator field that can dynamically select from multiple configured PUCCH resources. This parameter change enables flexible resource allocation, allowing the system to provide reliable feedback to multiple transmission points while efficiently managing uplink resource usage through dynamic selection rather than static allocation.
3Stability of the object's composition
If the PUCCH resource is determined based on the search space set with the lowest index, then resource allocation consistency is improved, but flexibility in resource selection is reduced
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple PUCCH resources and their associated search space sets before actual HARQ-ACK transmission. The UE and gNB both know the mapping between PUCCH resources and search space sets in advance, ensuring consistent resource allocation while maintaining flexibility through the pre-established mapping relationships that can be dynamically selected based on transmission conditions.
Data Source
AI summary
The disclosure relates to a communication technique that converges a 5th generation (5G) communication system for supporting a higher data rate after a 4th generation (4G) system with Internet of things (IoT) technology, and a system thereof. The disclosure can be applied to intelligent services (e.g., smart home, smart building, smart city, smart or connected car, healthcare, digital education, retail, security and safety related services, etc.) based on 5G communication technology and IoT-related technology. The disclosure relates to a wireless communication system and, more particularly, to a method and an apparatus wherein a User Equipment (UE) transmits Hybrid Automatic Repeat request Acknowledgement (HARQ-ACK) information to multiple transmission points, panels, or beams through an uplink for cooperative communication between multiple transmission points, panels, or beams.