Wireless Device Secondary RAT Measurement Timing
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Solution Overview
Problem
Current wireless communication devices face performance issues due to insufficient measurement gaps for secondary radio access technologies, leading to erroneous signals and increased handoff latency when switching between primary and secondary RATs.
Innovation Solution
The implementation of a wireless communication device with a measurement module that allows for efficient measurement of secondary RATs by overlapping measurements with existing communication or performing high-priority measurements outside allocated gaps, minimizing interference and reducing handoff latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement gaps are allocated for secondary RAT measurements, then measurement capability is improved, but measurement duration exceeds available gap time causing packet loss and retransmission
Solution Approach 1:
The device performs secondary RAT measurements during uplink transmission periods before the measurement gap begins. By completing measurements in advance during periods when the primary RAT is transmitting uplink signals, the device ensures measurements are finished before the measurement gap starts, eliminating the need to ignore incoming packets and avoiding retransmission delays.
Solution Approach 2:
The measurement timing is dynamically adjusted to utilize uplink transmission periods. The device adapts its measurement schedule to match the dynamic timing of uplink transmissions, performing measurements during these variable time windows rather than relying on fixed measurement gap allocations.
2Reliability
If measurements are performed during allocated measurement gaps, then interference with primary RAT communication is reduced, but handoff latency increases due to post-communication measurement acquisition
Solution Approach 1:
The device performs secondary RAT measurements during uplink transmission periods before handoff is initiated. By completing measurements in advance during ongoing primary RAT communication, the device prepares handoff information beforehand, significantly reducing handoff latency when the actual handoff occurs.
Solution Approach 2:
The measurement process continues during uplink transmission periods without interrupting primary RAT communication. The device maintains continuous measurement capability by utilizing otherwise idle uplink transmission time, ensuring measurements are always available when needed for handoff decisions.
3Measurement precision
If measurement duration is extended to complete secondary RAT measurements, then measurement accuracy is improved, but incoming packets are ignored causing erroneous signals and retransmission
Solution Approach 1:
The device completes secondary RAT measurements during uplink transmission periods before the measurement gap begins. By finishing measurements in advance, the device avoids the need to ignore incoming packets during the measurement gap, eliminating erroneous signals and retransmission requirements while maintaining measurement accuracy.
Data Source
AI summary
A wireless communication device is disclosed that is capable of performing efficient measurements of secondary radio access technologies (RATs). The device includes multiple receiver chains. While operating in a first RAT, the device receives a measurement gap in order to perform measurements. Even though the measurement gap may be too small to adequately measure the other RAT, the device controls one of the receiver chains to measure the other RAT during a time period that overlaps with the measurement gap. In addition, when preparing for an inter-RAT handoff, the device controls one of the receiver chains to perform measurements regardless of whether a measurement gap has been received. In this manner, measurements of alternative RATs are efficiently performed, and handoff latency is significantly reduced.