Inter-frequency Cell Selection Data Distribution for Multi-carrier Wireless Networks
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Solution Overview
Problem
In heterogeneous wireless network deployments, mobile terminals face challenges in maintaining signal quality and efficiency due to the need to tune between different carrier frequencies, leading to measurement gaps and increased battery consumption, especially when accessing subscriber-deployed base stations like Femto cells.
Innovation Solution
The method involves obtaining and transmitting cell selection data between base stations operating on different carrier frequencies, allowing mobile terminals to make handover decisions without tuning away from the serving carrier, thereby reducing the need for frequent frequency changes and maintaining signal measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mobile terminals tune between different carrier frequencies to access base stations, then network access capability is improved, but measurement gaps and battery consumption increase
Solution Approach 1:
The system performs preliminary actions by having the serving base station obtain and transmit cell selection data for non-serving carriers in advance. This allows mobile terminals to make handover decisions without needing to tune to non-serving carriers to gather information, thereby eliminating the need for frequent frequency changes and reducing battery consumption while maintaining network access capability
2Adaptability or versatility
If mobile terminals tune between different carrier frequencies, then access to subscriber-deployed base stations is improved, but signal measurement continuity deteriorates
Solution Approach 1:
The serving base station acts as an intermediary by obtaining cell selection data for non-serving carriers and transmitting it to mobile terminals. This mediator approach allows terminals to access information about subscriber-deployed base stations without directly tuning to their frequencies, thus maintaining continuous signal measurements on the serving carrier while still enabling access to heterogeneous network nodes
3Measurement precision
If mobile terminals perform inter-carrier handover determinations by tuning to non-serving carriers, then handover accuracy is improved, but measurement gaps increase
Solution Approach 1:
The system performs preliminary actions by having the serving base station obtain cell selection data for non-serving carriers in advance and transmit it to mobile terminals. This allows terminals to make accurate handover determinations using pre-gathered information without needing to tune to non-serving carriers at the moment of decision, thereby eliminating measurement gaps while maintaining handover accuracy
Data Source
AI summary
Providing for user equipment mobility in a multi-carrier wireless network deployment is described herein. By way of example, data pertinent to mobile cell selection can be shared among base stations operating on different carrier frequencies either over-the-air or via a wired backhaul, and distributed by a base station to mobile terminals served by the base station. In one aspect, the data can be distributed over a wireless channel reserved for inter-carrier association data, whereas in other aspects, the data can be unicast to particular mobile terminals served by the base station. This can reduce or avoid a need for individual mobile terminals to tune away to a non-serving carrier for inter-carrier association or handover determinations. Accordingly, gaps in signal analysis on a serving carrier can be reduced or avoided, improving overall quality of wireless communication in a multi-carrier environment.