Wireless Subframe Classification for Interference Management
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing radio resources and minimizing interference across different subframes in a multi-user environment, particularly in relay-based networks where self-interference and congestion can occur.
Innovation Solution
The method involves classifying subframes into three types based on interference levels: unicast, contention-based, and relay node subframes, where specific subframes are allocated for restricted or no communication to manage interference and optimize radio resource usage, allowing for efficient signal transmission and reception according to the radio environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If subframes are allocated for relay node communication, then relay node communication efficiency is improved, but interference with other network nodes increases
Solution Approach 1:
The patent segments the radio frame into three distinct subframe types (first type, second type, third type) with different interference characteristics. This segmentation allows relay nodes to communicate during third type subframes with restricted transmissions from other nodes, while other subframe types serve different communication needs, thereby resolving the interference problem while maintaining relay communication efficiency
Solution Approach 2:
Different subframe types are assigned different quality characteristics in terms of interference levels. Third type subframes are specifically designed with restricted transmissions from second network nodes to provide a low-interference environment for relay node communications, while first and second type subframes have different transmission restrictions suited for their respective communication purposes
2Object-affected harmful factors
If transmissions from second network node are restricted on first type subframe, then interference is reduced, but radio resource utilization decreases
Solution Approach 1:
The patent implements periodic transmission restrictions where second network nodes are allowed to transmit on first and second type subframes but restricted on third type subframes. This periodic pattern of restricted and unrestricted transmissions reduces interference during critical relay communications while maintaining resource utilization during other subframe types, resolving the contradiction between interference reduction and resource utilization
3Object-affected harmful factors
If three types of subframes are implemented, then interference management is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring and signaling the three subframe types to relay nodes and other network nodes before communication occurs. The first network node provides information about the three subframe types in advance, allowing all nodes to prepare their transmission and reception patterns accordingly, which simplifies the management complexity despite the multi-type subframe structure
Data Source
AI summary
A method of communicating with a first network node by an user equipment (UE) in a wireless communication system using three types of subframes is disclosed. The present invention comprises receiving information on the three types of subframes from the first network node; communicating with the first network node on a first type subframe, wherein a transmission of signals in a second network node is restricted; and communicating with the first network node on a second type subframe, wherein the transmission of signals in the second network node is not restricted, wherein no communication is performed with the first network node on a third type subframe.