Base Station Beacon Signals for Inter-Frequency Handover
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Solution Overview
Problem
Wireless communication networks face interference issues due to overlapping base station signals, which degrade performance and hinder efficient load balancing across different cell types in heterogeneous networks, making it difficult to effectively manage inter-frequency handovers and traffic offloading.
Innovation Solution
A method where a base station transmits beacon signals on a frequency used by neighboring base stations, selecting a cell identity that causes common reference signals to collide, allowing user equipment to detect and hand over to the transmitting base station, thereby reducing load on serving base stations and improving network resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If base stations transmit on the same frequency, then network coverage and resource utilization improve, but interference between base stations increases and performance degrades
Solution Approach 1:
The patent changes the cell identity parameter to enable CRS collision on the second frequency while maintaining normal operation on the first frequency. This parameter modification allows the system to transmit on the same frequency without causing harmful interference, as the colliding CRSs are designed to cancel out or be recognizable as interference patterns that UEs can handle.
Solution Approach 2:
The patent segments the network operation into two distinct frequency domains: a first frequency for normal communication and a second frequency for load balancing and handover signaling. This segmentation allows interference management by separating traffic-bearing signals from load-balancing signals, enabling base stations to transmit on the same frequency at different times or with different signal characteristics.
2Object-affected harmful factors
If base stations use different frequencies, then interference is reduced, but network loading balance and traffic offloading efficiency worsen
Solution Approach 1:
The patent introduces a frequency dimension for load balancing operations by transmitting beacon signals and CRSs on a second frequency that is different from the primary communication frequency. This dimensional addition enables UEs to discover alternative base stations and perform inter-frequency handovers, improving load balancing efficiency without compromising the primary communication quality on the first frequency.
3Adaptability or versatility
If cell ID is selected to cause CRS collision, then inter-frequency handover is enabled, but signal quality and detection precision may worsen
Solution Approach 1:
The patent converts the harmful effect of CRS collision into a beneficial mechanism for load balancing. By deliberately selecting cell IDs that cause CRS collision on the second frequency, the system creates recognizable interference patterns that signal to UEs the availability of alternative base stations. The collision itself becomes a handover trigger, transforming what would normally be a degradation into a useful load-balancing mechanism.
Data Source
AI summary
Certain aspects of the present disclosure provide methods, apparatus, and computer-program products for improving network loading (e.g., by enabling inter-frequency handover and/or traffic offloading between neighboring base stations). In aspects, the proposed methods may include transmitting a beacon signal on a frequency (e.g., carrier frequency) other than the frequency currently used by a base station. The base station may select a cell identity (ID) and transmit one or more beacon signals on the frequency using the selected cell ID. The beacon signal may be used to decide whether or not to perform an inter-frequency handover.