Event-Based Random Access Preambles for Lower-Latency Sidelink Data
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing latency during data transmission, particularly in scenarios where user equipment (UEs) communicate directly over sidelinks without base station assistance, leading to inefficiencies in resource allocation and contention resolution.
Innovation Solution
The solution involves associating specific random access preambles with transmission information, such as event-based data, to enhance data-centric communication. This includes devices selecting preambles based on transmission information like device identity, message priority, or event triggers, allowing for synchronized and unsynchronized wireless signals to optimize contention resolution and timing alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional random access procedures are used for data transmission, then device compatibility and standard compliance are maintained, but transmission latency increases and resource allocation efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-associating specific random access preambles with particular transmission information types (event-based data). This allows devices to directly select the appropriate preamble based on the event type without going through traditional contention-based random access procedures, thereby reducing transmission latency while maintaining resource allocation efficiency
Solution Approach 2:
The patent changes the parameter of preamble selection from random selection to information-based selection. By mapping transmission information (event type, priority, device identity) to specific preamble indices, the system transforms the random access procedure into a deterministic process that reduces latency and improves resource allocation efficiency
2Productivity
If preambles are selected based on transmission information, then resource allocation efficiency and latency are improved, but system complexity increases due to additional association mappings
Solution Approach 1:
The patent reduces device complexity by performing preliminary configuration at the network side, where the base station provides the association mapping between transmission information and preambles. Devices simply follow the pre-configured mapping rules without needing complex decision-making algorithms, thus maintaining low device complexity while achieving efficient resource allocation
Solution Approach 2:
The patent replaces complex mechanical decision-making processes in devices with a simpler information-based selection mechanism. Instead of devices performing complex analysis to determine which preamble to use, the system uses direct mapping from transmission information to preamble indices, substituting complex device-side processing with simpler lookup-based selection
3Measurement precision
If synchronized signals are used for contention resolution, then timing alignment is improved, but latency increases due to additional synchronization steps
Solution Approach 1:
The patent applies preliminary action by performing timing alignment through preamble selection before the actual data transmission. The associated preamble carries timing information that allows the receiving device to align its timing with the transmitting device in advance, eliminating the need for additional synchronization steps during contention resolution and thus reducing latency while maintaining precision
Data Source
AI summary
A device for communicating in a wireless communication network to transmit transmission information by transmitting a wireless signal in a random access channel of wireless communication network includes a wireless interface configured for transmitting the wireless signal and a control unit configured for providing the wireless signals so as to include a random access preamble. The control unit is configured for selecting the random access preamble/that the random access preamble is associated with the transmission information.