Radio Base Station Uplink Interference Control
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Solution Overview
Problem
In radio communications networks, particularly in scenarios with Femto radio base stations, there is significant uplink interference between user equipment and neighboring radio base stations, especially when frequencies are reused, leading to performance degradation and coverage issues.
Innovation Solution
A method and arrangement in a radio base station that estimates uplink interference and calculates a maximum allowed user equipment transmission power, which is signaled to the user equipment to limit transmission power, thereby minimizing interference. This involves receiving data associated with neighboring radio base stations, estimating interference, and calculating the maximum allowed transmission power based on pathloss measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency reuse is implemented between Femto and Macro radio base stations, then spectrum efficiency is improved, but uplink interference increases
Solution Approach 1:
The system dynamically changes transmission power parameters based on interference conditions. The Femto radio base station receives interference indicators from the Macro radio base station, estimates the interference level, and adjusts the maximum allowed transmission power of user equipment accordingly. This parameter adaptation allows frequency reuse while controlling interference through real-time power management.
2Area of stationary object
If maximum transmission power is increased for user equipment, then coverage is improved, but interference towards neighboring base stations increases
Solution Approach 1:
The system applies different transmission power limits to different user equipment based on their local interference conditions. Each user equipment receives a customized maximum allowed transmission power value from its serving Femto radio base station, which is determined by the local interference situation towards neighboring Macro radio base stations. This localized power control maintains coverage while minimizing interference.
Solution Approach 2:
The maximum allowed transmission power is not a fixed value but dynamically adjusted based on real-time interference conditions. The Femto radio base station continuously monitors interference indicators from neighboring Macro radio base stations and updates the transmission power limits for user equipment accordingly. This dynamic adaptation allows the system to respond to changing radio conditions and maintain optimal performance.
Data Source
AI summary
The invention relates to an arrangement (900) in a first radio base station (20) for decreasing interference of a user equipment (10) present in a first cell (25) towards a second radio base station (21, 40, 140), which first radio base station (20) and the second radio base station (21, 40, 140) are comprised in a radio communications network and the first radio base station (20) serves the first cell (25) and the second radio base station (21, 40, 140) serves a second cell (26, 42, 142). The arrangement (900) comprises a receiving unit (901) configured to receive data, which data is associated with the second radio base station (21, 40, 140). Furthermore, the arrangement (900) comprises an estimating unit (902) arranged to estimate uplink interference of the user equipment (10) towards the second radio base station (21, 40,140) based on the received data, a calculating unit (903) arranged to calculate a maximum allowed user equipment transmission power of the user equipment (10) from the estimated uplink interference, and a signalling unit (904) configured to signal the maximum allowed user equipment transmission power to the user equipment (10), which maximum allowed user equipment transmission power is arranged to limit a transmission power used by the user equipment (10).