Access Control Method for 5G Unlicensed Band Priority Differentiation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, particularly in the context of 5G and unlicensed bands, face challenges in differentiating message priorities carried on the same logical channel, leading to inefficient channel access and potential collisions during transmission.
Innovation Solution
The implementation of a method that selects access information based on access type, determines Channel Access Priority Class (CAPC), and performs a Listen-Before-Talk (LBT) procedure scaled by CAPC to prioritize access requests and control messages, ensuring successful transmissions in unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Channel Access Priority Class (CAPC) applies only for a logical channel, then the system structure remains simple, but it cannot distinguish different messages having different priorities carried on the same logical channel
Solution Approach 1:
The patent segments the access priority differentiation into two distinct parts: access information (access class and cause value) for message-level priority, and CAPC for logical channel-level priority. This segmentation allows different messages on the same logical channel to have different priorities without complicating the overall CAPC structure.
Solution Approach 2:
The patent adds a new dimension to priority differentiation by introducing access information (access class and cause value) as a separate layer above the existing CAPC mechanism. This dimensional addition enables fine-grained message priority differentiation while preserving the original CAPC structure for logical channel management.
2Reliability
If Listen-Before-Talk (LBT) procedure is applied in unlicensed bands, then channel collision is reduced, but transmission delay increases due to channel sensing and backoff
Solution Approach 1:
The patent changes the LBT parameters (carrier sensing duration and backoff time) dynamically based on the determined CAPC. Higher priority messages use shorter sensing durations and smaller backoff values, while lower priority messages use longer durations and larger backoff values. This parameter adjustment reduces access delay for urgent messages while maintaining collision avoidance through LBT.
3Productivity
If multiple access requests are transmitted simultaneously in unlicensed bands, then channel utilization improves, but collision probability increases
Solution Approach 1:
The patent adjusts LBT parameters based on message priority to create differentiated access patterns. High-priority messages use aggressive parameters (shorter sensing, smaller backoff) to secure channel access quickly, while low-priority messages use conservative parameters (longer sensing, larger backoff) to yield to higher priority traffic. This dynamic parameter adjustment enables efficient channel utilization while reducing collisions through priority-based access control.
Data Source
AI summary
Provided are a method of access control and a device supporting the method. According to an embodiment of the present disclosure, the method includes: selecting access information for an access to a cell; determining channel access priority class (CAPC) mapped to the selected access information; performing a listen-before-talk (LBT) procedure based on the CAPC; and transmitting an access request to the cell, when a result of the LBT is successful. According to another embodiment of the present disclosure, the method includes: determining channel access priority class (CAPC) mapped to a control message; performing a listen-before-talk (LBT) procedure based on the CAPC; and transmitting the control message, when a result of the LBT is successful.