LAA Unlicensed Carrier Contention Mechanism
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Solution Overview
Problem
The deployment of LTE in unlicensed carriers faces challenges due to the lack of a suitable contention withdrawal mechanism and procedure for Licensed Assisted Access (LAA) systems, leading to interference among wireless systems and inefficient resource management.
Innovation Solution
An unlicensed carrier contention method that involves Clear Channel Assessment (CCA) or evolution Clear Channel Assessment (eCCA) to determine channel availability, with dynamic decrement operations based on data priority, ensuring fair access and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple wireless access technologies are deployed in unlicensed carriers, then carrier efficiency and resource sharing are improved, but interference among wireless systems increases and coordination becomes difficult
Solution Approach 1:
The patent applies listening-before-talking mechanism where devices perform Clear Channel Assessment (CCA) before transmitting on unlicensed carriers. This preliminary action of checking channel availability prevents simultaneous transmissions that cause interference, while still enabling multiple technologies to share the carrier efficiently.
Solution Approach 2:
The patent introduces a contention withdrawal mechanism as an intermediary layer between multiple wireless systems. By implementing standardized contention procedures and withdrawal protocols, different wireless technologies can coexist on unlicensed carriers with reduced interference through coordinated access control.
2Object-affected harmful factors
If listening-before-talking mechanism is implemented in unlicensed carriers, then interference from neighboring systems is avoided, but access complexity and procedure requirements increase
Solution Approach 1:
The patent develops a universal contention mechanism that serves multiple functions: it implements listening-before-talking for interference avoidance, provides standardized access procedures for different wireless technologies, and enables contention withdrawal for coordinated access. This multi-functional approach reduces overall system complexity despite the added listening procedures.
3Object-affected harmful factors
If contention withdrawal mechanism is introduced for same-system neighboring transmission nodes, then interference is avoided, but device coordination requirements and management overhead increase
Solution Approach 1:
The patent implements contention withdrawal mechanism where transmission nodes autonomously monitor channel conditions and withdraw from contention when detecting potential conflicts with same-system neighbors. This self-service approach reduces centralized management overhead while effectively avoiding interference through distributed coordination.
Data Source
AI summary
An unlicensed carrier contention method and apparatus are provided. The method comprises that: a Licensed Assisted Access (LAA) device implements a Clear Channel Assessment (CCA) or an Evolution Clear Channel Assessment (eCCA) on a channel; if the result of the assessment is `idle`, the LAA device decrement N and determines whether or not the decremented N is greater than 0, wherein N is a natural number; and if the result of the determination indicates that the decremented N is not greater than 0, the LAA device uses an unlicensed carrier for data transmission. The disclosure addresses the problem that no contention withdrawal mechanism or procedure suitable for an LAA system is provided in the conventional art.