Sidelink Carrier Aggregation HARQ-ACK Codebook Collision Handling
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Solution Overview
Problem
The existing 3GPP sidelink communication systems face challenges in handling collisions and prioritization of transmissions and receptions across multiple carriers, particularly in scenarios involving uplink and sidelink communications, which can lead to inefficiencies and reduced performance in next-generation networks.
Innovation Solution
Implementing mechanisms for Type 1 and Type 2 sidelink HARQ-ACK codebook generation for carrier aggregation, along with prioritization rules to manage collisions and overlapping transmissions and receptions across multiple sidelink carriers, ensuring efficient resource allocation and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented for sidelink communications, then data rates and throughput are improved, but collision handling complexity and transmission prioritization difficulty increase
Solution Approach 1:
The patent segments the HARQ-ACK codebook into different types (Type 1 and Type 2) with distinct generation methods. Type 1 codebook includes HARQ-ACK information for dynamic grants, while Type 2 codebook includes HARQ-ACK information for configured grants. This segmentation allows the system to manage complexity by handling different transmission types separately, enabling carrier aggregation without overwhelming collision handling complexity.
Solution Approach 2:
The patent introduces dynamic prioritization rules that adapt to different transmission scenarios. The UE dynamically determines which transmission (sidelink or uplink) to perform based on configured priorities and collision detection. This dynamic approach allows the system to maintain high data rates through carrier aggregation while managing complexity through adaptive, scenario-based decision making rather than static complex rules.
2Productivity
If multiple sidelink carriers are used simultaneously, then spectral efficiency is improved, but transmission prioritization and collision resolution difficulty increase
Solution Approach 1:
The patent establishes preliminary prioritization rules before collisions occur. The UE is configured with priority values for different transmission types (sidelink transmission, sidelink reception, uplink transmission). When collisions are detected across multiple carriers, the UE already has the prioritization framework in place to immediately determine which transmission should proceed, eliminating the need for complex real-time decision making and improving ease of operation while maintaining high spectral efficiency.
Solution Approach 2:
The patent introduces the HARQ-ACK codebook as an intermediary mechanism that mediates between multiple carriers and transmission types. By generating and maintaining a comprehensive HARQ-ACK codebook that includes information from all active carriers, the system creates a centralized structure that simplifies collision detection and prioritization decisions, enabling simultaneous use of multiple carriers without proportionally increasing operational complexity.
3Reliability
If HARQ-ACK feedback is transmitted on PUCCH, then reliability is improved, but power consumption and resource usage increase
Solution Approach 1:
The patent applies partial action by selectively generating and transmitting HARQ-ACK information based on actual transmission conditions. The UE determines which carriers and transmission types require HARQ-ACK feedback based on whether collisions occurred and whether retransmissions are needed. This partial approach ensures reliability for critical transmissions while avoiding unnecessary power consumption by not generating feedback for all possible transmission combinations, only for those that are actually needed.
Data Source
AI summary
An apparatus and system of supporting sidelink carrier aggregation are described. Mechanisms for Type 1 and Type 2 sidelink hybrid automatic repeat request-acknowledgement (HARQ-ACK) codebook generation for carrier aggregation are described. A sidelink carrier index is included in downlink control information (DCI) format 3 0 received by a user equipment. The sidelink carrier index indicates the sidelink carrier used for resource allocation of a physical sidelink shared channel (PSSCH) and physical sidelink control channel (PSCCH). The HARQ-ACK for a sidelink serving cell is generated and the sidelink HARQ-ACK information bits are concatenated in accordance with ascending order of sidelink serving cell index. Collision handling and prioritization among sidelink transmissions and reception, as well as uplink transmissions during sidelink carrier aggregation are described.