Wireless Base Station Pilot Signal Interference Control
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Solution Overview
Problem
Existing wireless communication systems face interference issues due to the continuous transmission of pilot signals by wireless base stations, especially when multiple base stations using the same frequency are nearby, leading to decreased throughput.
Innovation Solution
A wireless base station equipped with a determining unit to assess potential interference and a pilot signal transmission control unit that either stops or reduces pilot signal transmission in user data areas during high-traffic periods to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless base station continuously transmits the pilot signal for channel estimation and synchronization, then the channel estimation and synchronization performance is improved, but the interference with downlink signals from other base stations increases
Solution Approach 1:
The patent applies periodic action by transmitting the pilot signal only during specific time periods (first and second periods) rather than continuously. The base station transmits the pilot signal in the first period, then stops transmission during the second period when other base stations are transmitting downlink signals, thereby reducing interference while maintaining necessary channel estimation and synchronization functionality.
2Measurement precision
If the wireless base station transmits the pilot signal during high-traffic time periods, then the channel estimation accuracy is improved, but the throughput of the wireless system decreases
Solution Approach 1:
The patent applies dynamics by adaptively adjusting the pilot signal transmission based on traffic conditions. During high-traffic time periods, the base station stops transmitting the pilot signal to improve throughput, while maintaining pilot transmission during low-traffic periods to ensure channel estimation accuracy. This dynamic adjustment allows the system to optimize between measurement precision and productivity based on real-time conditions.
3Productivity
If multiple wireless base stations use the same frequency channel, then the frequency utilization efficiency is improved, but the interference between base stations increases
Solution Approach 1:
The patent resolves the interference issue between multiple base stations using the same frequency by implementing periodic action. Each base station transmits its pilot signal during designated time periods and remains silent during other periods when neighboring base stations are transmitting. This time-division approach allows multiple base stations to share the same frequency channel efficiently while preventing simultaneous transmissions that would cause harmful interference.
Data Source
AI summary
When time at present is included in a high-traffic time period, an interference determining unit (37) determines that there is a possibility that a downlink signal to be received by any wireless terminal has interference with a pilot signal transmitted from a wireless base station. A pilot signal transmission control unit (40) controls the transmission of the pilot signal, which is included in an OFDMA frame or an OFDM frame. When it is determined that there is the possibility of interference, the pilot signal transmission control unit (40) stops the transmission of the pilot signal or reduces power of the pilot signal in a whole or a portion of a user data area.