TDD Base Station and Terminal Guard Bands for Carrier Coexistence
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Solution Overview
Problem
In wireless communication systems, particularly in coexistence environments of carrier networks and local networks, there is a challenge in effectively suppressing interference between different networks, especially when local networks with lower priority interfere with carrier networks of higher priority.
Innovation Solution
The proposed solution involves a base station apparatus and terminal apparatus in a local network that operate using Time Division Duplex (TDD) in a frequency band different from that of a carrier network. These devices detect the presence of radio waves from the carrier network and, upon detection, instruct the terminal apparatus to set a guard band in the frequency band used by the carrier network to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If local networks deploy communication in frequency bands adjacent to carrier networks, then spectrum utilization is improved, but interference between networks increases
Solution Approach 1:
The patent introduces a guard band as an intermediary frequency region between the local network's uplink band and the carrier network's downlink band. This guard band acts as a buffer that absorbs interference, allowing both networks to operate simultaneously without severe mutual disruption. The terminal apparatus in the local network is instructed to set this guard band based on notifications from the base station, effectively creating a protective zone that resolves the interference issue while maintaining spectrum efficiency.
2Productivity
If local networks operate without guard bands to maximize bandwidth usage, then communication efficiency is improved, but interference with carrier networks worsens
Solution Approach 1:
The patent implements dynamic guard band configuration where the base station apparatus notifies terminal apparatuses whether to set a guard band based on detected carrier network radio waves. When carrier networks are detected, guard bands are activated; when not detected, communication can proceed without guard bands. This dynamic adjustment optimizes communication efficiency while preventing interference only when necessary, resolving the contradiction between efficiency and interference control.
3Reliability
If terminal apparatuses continuously monitor for carrier network radio waves, then interference suppression is improved, but device complexity increases
Solution Approach 1:
The patent enables terminal apparatuses to autonomously detect carrier network radio waves and receive simple binary notifications from the base station about whether to set guard bands. The terminal apparatus independently makes the decision to configure the guard band based on this simple notification, without requiring complex centralized control. This self-service approach maintains reliable interference suppression while minimizing device complexity by distributing the detection and decision-making functions to individual terminals.
Data Source
AI summary
A base station apparatus of a second network in which communication is performed using time division duplex (TDD) in a frequency band different from a frequency band of a predetermined first network receives, from a terminal apparatus currently connected to the base station apparatus, a first notification indicating whether the terminal apparatus has detected a radio wave of a network different from the second network, and transmits, if it is specified based on the first notification that the terminal apparatus has detected a radio wave of the first network, to the terminal apparatus, a second notification for instructing to perform communication by setting a guard band for the frequency band used in the first network.