Uplink Interference Identification via Random Access Preamble Signaling
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Solution Overview
Problem
Current wireless communication systems face challenges in identifying and managing interfering User Equipment (UE) that affect pico Base Stations (BS) within the coverage of macro BS, particularly in efficiently controlling uplink interference.
Innovation Solution
A method involving the macro BS receiving an uplink interference control request from the pico BS, signaling random access preambles to candidate interfering UEs, and determining interfering UEs based on received signal strength, with specific transmission power settings for the preambles to control interference effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If random access preambles are signaled to candidate interfering UEs for interference control, then interfering UEs can be identified, but the complexity of the system increases due to additional signaling and coordination between macro BS and pico BS
Solution Approach 1:
The system segments the interference identification process into distinct phases: macro BS signals random access preambles to candidate interfering UEs, UEs transmit these preambles, pico BS measures received signal strength, and the system determines interfering UEs based on measurements. This segmentation allows each component to perform its specific function efficiently while maintaining overall system manageability despite the increased complexity.
2Object-affected harmful factors
If specific transmission power is set for random access preambles to control interference, then interference control effectiveness is improved, but the difficulty of configuring and managing power settings increases
Solution Approach 1:
The system changes the power parameter specifically for random access preambles used in interference control, distinguishing it from normal data transmission power. By adjusting and optimizing the transmission power of these specific preambles, the system effectively controls interference levels from candidate UEs to the pico BS while maintaining manageable power configuration through targeted parameter adjustment rather than system-wide changes.
3Measurement precision
If multiple candidate interfering UEs are monitored through random access procedure, then interference source identification is improved, but the time required for identification increases
Solution Approach 1:
The system employs periodic random access procedures where candidate interfering UEs transmit preambles at scheduled intervals. This periodic action allows the pico BS to measure received signal strength from multiple UEs systematically, identifying interference sources with high accuracy while managing the time required through structured, repeated measurement cycles rather than continuous monitoring.
Data Source
AI summary
One embodiment of the present invention discloses a method for identifying the interference of a user equipment(s) on a pico base station located within the coverage of a macro base station in a wireless communication system, and the method comprises the steps: enabling the macro base station to receive an uplink (UL) interference control request message from the pico base station; signaling a random access preamble for the UL interference control to each of a plurality of interference candidate user equipments served by the macro base station; receiving, from the pico base station, received signal strength information of the random access preamble transmitted by the plurality of interference candidate user equipments; and determining the interference of user equipment on the pico base station on the basis of the received signal strength information, wherein transmission power of the random access preamble can be set in a random access preamble-specific manner.