Wireless Relay Station Handover Coordination for Mobile Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless portable Internet systems, simultaneous handovers by multiple subscriber stations moving together, such as on buses or trains, lead to increased bandwidth inefficiency and latency due to increased message transmission and higher collision probabilities during random access to base stations.
Innovation Solution
A wireless relay station coordinates handovers for multiple subscriber stations moving along the same path by receiving neighboring base station information, performing scanning, determining handover conditions, and requesting handovers as a single unit, thereby reducing signaling load and allocating dedicated ranging regions to minimize collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple subscriber stations perform handover simultaneously, then mobility service is maintained, but bandwidth efficiency deteriorates and latency increases
Solution Approach 1:
The patent merges multiple individual handover requests from subscriber stations into a single batched handover request. The relay station collects handover information from multiple subscriber stations and sends a unified handover request to the target base station, consolidating what would otherwise be multiple separate signaling exchanges. This reduces the total bandwidth consumption and processing overhead while maintaining the mobility service for all affected subscriber stations.
Solution Approach 2:
The patent implements preliminary action by having the relay station collect and prepare handover information from multiple subscriber stations before actually executing the handover. The relay station gathers neighboring base station information, subscriber station locations, and handover requirements in advance, then coordinates the handover execution at the optimal time. This preparation phase reduces the complexity and bandwidth requirements during the actual handover transmission.
2Reliability
If multiple subscriber stations perform random access to target base station, then connection is established, but collision probability increases and latency increases
Solution Approach 1:
The relay station serves as an intermediary between the subscriber stations and the target base station during the handover process. Instead of subscriber stations performing direct random access to the target base station (which causes collisions), the relay station coordinates the connection establishment by transmitting prepared handover information and receiving confirmation messages. This intermediary role eliminates simultaneous random access collisions and reduces handover latency.
Solution Approach 2:
The relay station performs preliminary action by pre-preparing handover information packets containing all necessary connection parameters, timing information, and coordination data before the actual connection establishment. This preparation allows the target base station to allocate resources in advance and confirms connection status before full data transmission begins, reducing the time subscriber stations would otherwise spend in random access and collision resolution.
Data Source
AI summary
A handover method according to an embodiment of the present invention includes: receiving neighboring base station information at a wireless relay station providing a wireless communication service moving together with a plurality of subscriber stations that move along the same moving path; performing scanning to check a wireless environment state of a neighboring base station using the received neighboring base station information; performing handover of the plurality of subscriber stations to a target base station as a single handover unit, when a handover condition is met during the scanning; and notifying the subscriber station of completion of handover preparation with the target base station.