Synchronized Shared Channel Interference Control
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Solution Overview
Problem
In wireless communication networks, the coexistence of nearby LTE systems using shared spectrum resources leads to interference issues due to unsynchronized transmission, particularly when user equipment (UE) devices are closer to neighboring cells than their connected ones, causing disturbances in uplink transmissions and poor downlink quality.
Innovation Solution
The implementation of an apparatus and method that utilize a synchronized shared channel with a frame structure, where devices measure interference during a given number of symbol periods at the beginning of each frame or subframe to decide whether to transmit during the remaining symbol periods, and select a specific number of symbol periods for each frame or subframe for efficient resource allocation, taking into account path loss and Quality of Service (QoS) requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If devices transmit on shared unlicensed frequency bands without interference measurement, then data transmission efficiency is improved, but channel contention and interference increase
Solution Approach 1:
The patent applies preliminary action by requiring devices to measure interference on the shared channel before transmission. Devices perform interference measurement during designated measurement periods and only transmit when interference levels are acceptable, preventing transmission conflicts before they occur.
Solution Approach 2:
The patent implements feedback mechanisms where network elements provide interference measurement configurations and transmission decisions to devices. Devices continuously monitor channel conditions and adjust their transmission behavior based on feedback about interference levels, creating a closed-loop control system.
2Measurement precision
If interference measurement is performed during more symbol periods, then interference detection accuracy is improved, but available transmission time is reduced
Solution Approach 1:
The patent applies dynamics by making the interference measurement duration configurable and adaptable. Network elements can dynamically adjust the number of symbol periods allocated for measurement based on current channel conditions, traffic requirements, and QoS parameters, optimizing the balance between measurement accuracy and transmission opportunities.
Solution Approach 2:
The patent changes parameters by allowing flexible configuration of measurement timing and duration. Different QoS levels, path loss conditions, and traffic patterns can be associated with different measurement period configurations, enabling parameter optimization for various operational scenarios.
3Ease of operation
If path loss compensation is applied to balance received signal powers, then fairness between cells is improved, but uplink interference increases
Solution Approach 1:
The patent applies preliminary action by performing path loss compensation calculations before uplink transmission. Devices receive path loss compensation values from network elements and adjust their transmit power accordingly before transmitting on the shared channel, ensuring fair received signal levels while controlling interference.
Data Source
AI summary
Apparatus and method for communication are provided. The solution comprises communicating on a synchronized shared channel having a frame structure comprising symbols; receiving from a network element a given number for each frame or sub frame, and during the given number of symbol periods in the beginning of a frame or sub frame measuring interference and making a decision whether to transmit or not during the rest of the symbol periods of the frame or sub frame.