Inter-Frequency Handoff Signaling for Single-Receiver UE
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Solution Overview
Problem
Current mobile communication systems, particularly 3G+, face challenges in enabling handovers across frequency bands without data loss, especially with single receiver subscriber stations, due to the packet-oriented nature of 3G+ and the lack of dedicated channels for measurements in existing systems.
Innovation Solution
A method for intra-system, inter-frequency, and inter-system monitoring that allows subscriber stations with a single receiver to perform measurements by signaling the need for measurement opportunities to the access device, which then coordinates data packet transmission with sufficient time intervals and increased power to prevent data loss, using techniques like measurement signaling, time gaps, and frequency switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single receiver subscriber station performs measurements on other frequency bands, then measurement capability is improved, but data packet loss occurs due to receiver unavailability
Solution Approach 1:
The system performs preliminary actions by scheduling measurement opportunities in advance through measurement signaling that indicates specific time intervals when data transmission is suspended. This allows the subscriber station to know beforehand when measurements will occur and prepare accordingly, preventing data loss through proactive scheduling rather than reactive compensation
Solution Approach 2:
Measurement signaling acts as an intermediary mechanism between the access device and subscriber station, coordinating the suspension of data transmission and the initiation of measurements. The signaling provides a structured framework that mediates the conflict between continuous data reception and measurement activities, enabling seamless transitions without data loss
2Measurement precision
If dual receivers are used in subscriber stations, then continuous data reception and measurement capability are both improved, but device complexity and cost increase
Solution Approach 1:
The system implements periodic measurement opportunities through measurement signaling that schedules specific time intervals for measurements. This periodic structure allows a single receiver to alternate between data reception and measurement tasks in a regular pattern, eliminating the need for dual receivers while maintaining measurement capability through time-division multiplexing
Solution Approach 2:
The single receiver is designed to be multi-functional, performing both data reception and measurement tasks at different time intervals. The measurement signaling framework enables the receiver to universally handle both functions by coordinating its activities, making dual receivers unnecessary while maintaining full functionality
3Productivity
If data transmission continues during measurements, then productivity is improved, but measurement accuracy deteriorates due to data loss
Solution Approach 1:
The measurement signaling provides feedback mechanisms that inform the subscriber station about upcoming measurement intervals, allowing it to suspend data reception temporarily. This feedback loop ensures that measurements can be performed accurately without data loss, while the system compensates for the temporary suspension through rescheduling or error correction protocols
Data Source
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AI summary
The invention relates to a handoff preparation method in a wireless communication system in which signals within a connection (V) on a wireless interface are transmitted exclusively in a packet-switched manner between a user station (UE) and an access device (NB) located on the network side. According to said method, the user station (UE) signals a need to measure signals to the access device (NB) located on the network side, the access device (NB) located on the network side sends measurement signaling (s*) to the user station (UE), and the user station (UE) measures signals of at least one additional access device (NB*) located on the network side at a second frequency range (f2) while receiving data packets (d) within the connection (V) at a first frequency range (f1) based on the received measurement signaling (s*), the second frequency range (f2) being disjunct from the first frequency range (f1).