Time-Frequency Contention Resource Selection for Low-Latency Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing increased communication traffic and ensuring reliable, low-latency data transmission, particularly in scenarios like eMBB and URLLC, where contention for resources leads to collisions and delays, especially in IoT devices with limited power and coverage.
Innovation Solution
A method and apparatus for terminals to select contention resources using time and frequency information provided by a reader, allowing for efficient random access by distinguishing contention resources through frequency division multiplexing and dynamic slot length determination based on resource occupation and collision states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple terminals transmit data using random access scheme simultaneously, then communication traffic capacity increases, but collision probability increases and transmission reliability deteriorates
Solution Approach 1:
The patent segments the contention resources into multiple groups, where each group contains multiple contention resources. Terminals are assigned to specific groups based on their data priority or service type, and within each group, terminals select contention resources from dedicated resources. This segmentation reduces collision probability by distributing terminals across different groups and resources, thereby maintaining transmission reliability while supporting increased traffic capacity.
2Productivity
If contention resources are increased to support more terminals, then productivity improves, but resource management complexity increases
Solution Approach 1:
The patent employs dynamic slot length determination based on the occupation state and collision state of contention resources. When collisions are detected or resources are fully occupied, the system dynamically extends the slot length to provide additional transmission opportunities. This dynamic adjustment optimizes data transmission efficiency by adapting to real-time channel conditions without requiring a static increase in total resource quantity, thereby avoiding excessive resource management complexity.
3Reliability
If contention resolution is performed for each terminal individually, then transmission reliability improves, but processing time increases
Solution Approach 1:
The patent merges the contention resolution process by performing resolution at the group level rather than for each terminal individually. The reader identifies collisions within a group and sends group-based contention resolution information that allows all terminals in the group to resolve their conflicts simultaneously. This merging approach maintains reliable contention resolution while significantly reducing the time required compared to individual terminal processing.
Data Source
Figure 1~2
Figure 3A~3C
Figure 4~5
AI summary
Provided are a method and apparatus for selecting contention resources of a terminal in a wireless communication system. A terminal receives, from a reader, at least one contention resource information distinguished by time and frequency resources, select at least one contention resource based on the received at least one contention resource information. Then, the terminal transmits, to the reader, a first message on a first frequency resource in a time domain corresponding to the selected at least one contention resource. The first message includes information triggered by the received at least one contention resource information. Thereafter, the terminal receives, from the reader, a second message in response to the transmitted first message.