Segmented NR Random Access Resources for Unlicensed Channel Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In New Radio (NR) Release 15, random access resources in unlicensed frequency bands are not efficiently utilized due to the need for channel detection before transmission, leading to resource waste and increased latency.
Innovation Solution
A method for configuring random access resources with time gaps and channel access indications to ensure efficient use of resources, allowing channel detection and transmission at different starting positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If random access resources are configured neighboring in time domain, then resource utilization efficiency is improved, but channel detection capability is degraded
Solution Approach 1:
The random access resources are segmented into multiple groups with different time domain starting positions. Each group can be independently selected based on channel detection results, allowing the system to maintain both high resource utilization and reliable channel detection by choosing appropriate segments.
Solution Approach 2:
The system dynamically selects which random access resource group to use based on real-time channel detection outcomes. This dynamic adaptation allows the system to optimize between resource efficiency and detection reliability depending on current channel conditions.
2Reliability
If channel detection is performed before transmission, then transmission reliability is improved, but random access latency is increased
Solution Approach 1:
Channel detection is performed in advance before actual data transmission on the random access resource. This preliminary action ensures that when transmission occurs, the channel is confirmed to be available, improving reliability while the time loss is minimized through efficient detection procedures.
3Productivity
If multiple terminal equipments use the same random access resources, then spectral efficiency is improved, but resource collision probability is increased
Solution Approach 1:
Different terminal equipments are assigned different time domain starting positions for their random access resources. This local differentiation allows multiple devices to share the same frequency resources while maintaining temporal separation, improving spectral efficiency while reducing collision probability through localized resource allocation.
Data Source
AI summary
A random access configuration method, a signal transmission method, apparatuses thereof and a system. The random access configuration method includes: a network device transmits first indication information, the first indication information including at least one of the following information: random access channel configuration index (first index); time gap between random access resources which are neighboring to each other in time domain; invalid random access resource(s); at least two time-domain starting positions of a random access resource; time-domain ending position of a random access resource; number of channel access attempts; and type of channel access. Hence, sufficient time gaps or more opportunities between neighboring random access resources may be guaranteed by the random access configuration method for performing channel detection, and the terminal equipment may perform channel detection accordingly and transmit msg.1 on a random access resource.