Wireless Terminal Handover via Path Loss Comparison
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems performing multi-base-station cooperative transmission, handover between base stations is hindered by equal signal quality, leading to reduced uplink throughput and increased power consumption, as the difference in signal quality between serving and neighboring base stations becomes negligible, preventing effective handover even when uplink signals reach better conditions at neighboring base stations.
Innovation Solution
A wireless terminal equipped with path-loss and distance comparison means to determine if handover from the current serving base station to a neighboring base station should occur when the path loss or distance to the neighboring base station is superior, allowing for improved uplink throughput or reduced power consumption by switching to a base station with better signal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-base-station cooperative transmission is performed, then downlink throughput at cell edges is improved, but handover is hindered because signal quality difference between base stations becomes negligible
Solution Approach 1:
The invention changes the handover decision parameter from signal quality (SINR/CINR) to path loss comparison. By using path loss as the new parameter, the system can identify when a terminal is closer to a neighboring base station even under CoMP conditions, enabling handover execution based on distance rather than signal quality equality.
Solution Approach 2:
The invention introduces path loss as an intermediary metric that bridges the gap between physical distance and signal quality. The terminal calculates path loss from received signal strength and transmits power information, creating a new decision-making basis that allows handover to proceed despite equal signal qualities from multiple base stations.
2Reliability
If handover is prevented under multi-base-station cooperative transmission, then downlink signal quality is maintained, but uplink throughput deteriorates and power consumption increases
Solution Approach 1:
The invention changes the handover evaluation parameter from downlink signal quality to path loss comparison. This allows the system to maintain downlink CoMP benefits while enabling uplink handover when the terminal is physically closer to a neighboring base station, thereby improving uplink throughput without sacrificing downlink quality.
3Reliability
If handover is prevented under multi-base-station cooperative transmission, then signal quality is maintained, but terminal power consumption increases
Solution Approach 1:
The invention introduces path loss comparison as a new handover parameter that is independent of signal quality under CoMP. This enables the terminal to handover to a closer base station based on distance metrics, reducing transmission power requirements and overall energy consumption while maintaining signal quality through the CoMP framework.
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
In a wireless communication system including a wireless terminal configured to communicate with the current serving base station and a neighboring base station which are capable of performing coordinated multi point transmission, it is made possible to achieve at least either improvement in uplink throughput or reduction in power consumption at the wireless terminal. The wireless terminal comprises a path-loss comparison means for comparing a first path loss which comprises a path loss between the wireless terminal and the current serving base station with a second path loss which comprises a path loss between the wireless terminal and the neighboring base station; a distance comparison means for comparing a first distance which comprises a distance between the wireless terminal and the current serving base station with a second distance which comprises a distance between the wireless terminal and the neighboring base station; and a control means for performing handover from the current serving base station to the neighboring base station, if at least either a first condition that the second path loss is smaller than the first path loss or a second condition that the second distance is shorter than the first distance is satisfied.