RRC Connection Initiation for V2X Sidelink Communication
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Solution Overview
Problem
Current sidelink communication systems face challenges in efficiently initiating RRC connections for UEs in RRC_IDLE/INACTIVE states, particularly when mode 1 dedicated resources are required for latency-sensitive V2X use cases. Additionally, there are issues with resource allocation for HARQ retransmissions and the efficient inclusion of source layer-2 IDs in sidelink MAC headers.
Innovation Solution
The proposed solution involves enhancing the trigger for initiating RRC connections, allowing UEs to initiate connections even when mode 2 resources are configured, and providing mechanisms for UEs to request mode 1 resources. Additionally, the solution addresses HARQ retransmission resource allocation by configuring scheduling request resources and includes methods to determine whether to include source layer-2 IDs in sidelink MAC headers based on communication type and HARQ feedback status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If UEs in RRC_IDLE/INACTIVE states use mode 2 resources for V2X sidelink communication, then resource allocation is simplified and coverage is extended, but latency increases and connection establishment efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring UEs with V2X communication parameters and resource pools before RRC connection establishment. UEs can perform sensing and resource selection in advance while in RRC_IDLE state, then quickly transition to transmission without requiring full connection setup, thereby reducing latency while maintaining simplified operation.
Solution Approach 2:
The patent implements dynamics by enabling flexible switching between mode 1 and mode 2 resource allocation based on real-time conditions. UEs can dynamically select the appropriate mode depending on network availability, traffic conditions, and latency requirements, optimizing the balance between connection efficiency and operational simplicity.
2Reliability
If UEs initiate RRC connection for mode 1 dedicated resources, then latency-sensitive V2X use cases are supported, but connection establishment time increases and system complexity increases
Solution Approach 1:
The patent applies preliminary action by having UEs pre-configure V2X parameters and perform sensing procedures before actual transmission. This allows the UE to have ready-to-use resource information when initiating RRC connection, reducing the establishment time while ensuring reliable dedicated resource allocation for mode 1 communication.
Solution Approach 2:
The patent implements feedback mechanisms where the network provides system information blocks containing V2X resource pool configurations and network conditions. UEs use this feedback to make informed decisions about mode selection and resource allocation, improving connection reliability while optimizing establishment time through better-informed rapid decisions.
3Adaptability or versatility
If system information includes transmission resources for all frequencies, then UE autonomous resource selection is enhanced, but system information size increases and processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the comprehensive resource allocation information into separate components: frequency-specific resource pools, priority indicators, and configuration parameters. Instead of providing a monolithic system information block, the network segments the information allowing UEs to process only relevant portions based on their operational frequency and requirements, reducing processing complexity while maintaining flexibility.
Solution Approach 2:
The patent implements local quality by providing frequency-specific resource pool configurations tailored to each operating frequency. Each frequency has its own dedicated resource pool information with localized parameters, allowing UEs to selectively process only the relevant frequency-specific information rather than analyzing all frequency data uniformly, thereby reducing overall processing complexity.
4Measurement precision
If source layer-2 IDs are always included in sidelink MAC headers, then identification accuracy is improved, but header size increases and processing overhead increases
Solution Approach 1:
The patent applies partial action by selectively including source layer-2 IDs in sidelink MAC headers based on communication requirements rather than universally including them. The patent determines inclusion based on factors such as communication type, HARQ feedback requirements, and network configuration, providing identification accuracy only when needed while avoiding unnecessary processing overhead in cases where full identification is not required.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the header structure based on communication conditions. The inclusion of source layer-2 IDs is controlled by configurable parameters such as communication type indicators and HARQ feedback status, allowing the system to adapt the header composition to match actual processing requirements and optimize the balance between identification accuracy and processing efficiency.
Data Source
AI summary
A communication method and system for converging a 5th generation (5G) communication system for supporting higher data rates beyond a 4th generation (4G) system with a technology for Internet of things (IoT) are provided. The communication method and system include intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method of a user equipment (UE) for performing a vehicle-to-everything (V2X) sidelink communication is provided.