LTE Channel Coordination in Shared Bands
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Solution Overview
Problem
Current LTE/LTE-A systems lack a solution for coordinating band sharing with WLAN systems to avoid severe interference or contention in shared frequency bands like the ISM 2.4 GHz band, leading to inefficient use of channels and potential collisions.
Innovation Solution
A method and apparatus that select a channel in a license-exempt frequency band, determine which user equipment sends request and clear messages, and compile a contend-prepare message to coordinate channel access, using a cluster head to manage user equipment in LTE systems, mimicking the CSMA/CA mechanism of WLAN systems to ensure fair and efficient use of shared bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE systems operate in shared frequency bands without coordination mechanisms, then spectrum utilization is improved, but interference and contention with WLAN systems increase
Solution Approach 1:
The patent introduces a coordination mechanism that acts as an intermediary between LTE and WLAN systems. The eNodeB (eNB) serves as a central coordinator that receives channel status information from WLAN access points, processes this information, and generates coordination decisions to prevent interference. This mediator approach allows both systems to coexist in shared bands by enabling the eNB to make informed decisions about resource allocation and interference avoidance based on real-time WLAN channel conditions.
2Object-affected harmful factors
If LTE systems implement coordination mechanisms with WLAN, then interference is reduced, but system complexity increases
Solution Approach 1:
The eNodeB acts as a centralized intermediary that consolidates the coordination functionality, avoiding the need for complex distributed coordination protocols between individual LTE devices and WLAN systems. The eNB collects channel status information from WLAN access points, processes this information centrally, and generates coordination decisions. This centralized approach reduces overall system complexity by creating a single point of control rather than requiring multiple devices to implement complex interaction protocols.
Solution Approach 2:
The coordination mechanism implements a feedback loop where the eNodeB continuously receives channel status information from WLAN access points, processes this feedback, and adjusts resource allocation decisions accordingly. The system monitors the shared spectrum conditions and dynamically adapts LTE resource allocation based on real-time WLAN activity, creating a closed-loop control system that optimizes coexistence while managing complexity through automated decision-making.
3Speed
If LTE systems use uncoordinated access in shared bands, then channel access speed is improved, but collision probability increases
Solution Approach 1:
The coordination mechanism performs preliminary actions by having the eNodeB proactively obtain channel status information from WLAN access points before LTE systems attempt channel access. The eNB receives and processes WLAN channel status reports in advance, allowing it to predict potential conflicts and prepare coordination decisions before collisions occur. This advance preparation enables faster and more reliable channel access by preventing collisions before they happen rather than reacting to them afterward.
Data Source
AI summary
The specification and drawings present a new method, apparatus and software related product (e.g., computer readable memory) for implementing a device-to-device communication of cellular, e.g., LTE, wireless devices on a shared band (e.g., ISM 2.4 GHz band), including the signaling and procedure design for contending or coordinating with the already existing radio systems (e.g., WLAN systems).