Adaptive Measurement Gap Configuration for Low Latency Cellular Systems
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Solution Overview
Problem
Current cellular communication systems face challenges in meeting low latency and high reliability requirements for mission-critical machine type communication devices, as existing measurement gap configurations disrupt ongoing communication and are not suitable for inter-RAT and inter-frequency measurements.
Innovation Solution
The method involves configuring measurement gaps with shorter lengths and specific periodicities to allow for efficient inter-RAT and inter-frequency measurements, enabling the wireless communication device to perform cell search and monitoring without violating low latency requirements, by adapting the measurement gap configuration based on signals from the wireless communication device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional measurement gap configurations are used for inter-RAT and inter-frequency measurements, then measurement capability is improved, but communication interruption time increases and latency requirements are violated
Solution Approach 1:
The patent applies dynamics by making the measurement gap configuration adaptive rather than static. The network node determines measurement gap configurations dynamically based on device capability information and current communication conditions. This allows the system to optimize the balance between measurement capability and communication interruption by adjusting gap length and periodicity according to actual needs, thereby resolving the contradiction between reliable measurements and minimal latency.
Solution Approach 2:
The patent changes key parameters of the measurement gap configuration, specifically the gap length and periodicity, to resolve the technical contradiction. By shortening the measurement gap length and optimizing periodicity based on device capabilities, the system enables inter-RAT and inter-frequency measurements while reducing communication interruption time below the maximum latency threshold, thus maintaining both measurement reliability and low latency.
2Measurement precision
If measurement gaps are extended to perform comprehensive cell search and monitoring, then measurement precision is improved, but message delay increases
Solution Approach 1:
The patent applies partial action by performing measurements in a optimized subset of opportunities rather than exhaustive searching. The network node configures measurement gaps that target specific frequencies and RATs based on device capability and network conditions, achieving sufficient measurement precision for handover decisions without requiring exhaustive cell search that would exceed latency constraints.
Solution Approach 2:
The patent applies preliminary action by having the wireless communication device indicate its capability to support short measurement gaps before actual measurements are performed. This capability indication allows the network node to pre-configure appropriate measurement gap parameters that will achieve necessary measurement precision within the device's latency constraints, avoiding the need for extended measurement periods.
3Loss of time
If strict latency requirements are enforced to meet low delay targets, then message delay is reduced, but measurement opportunities are limited
Solution Approach 1:
The patent applies universality by designing a measurement gap configuration system that serves multiple functions simultaneously. The configured measurement gaps enable inter-RAT measurements, inter-frequency measurements, and cell monitoring all within the same shortened gap structure, allowing the system to maintain comprehensive measurement capability while adhering to strict latency requirements through multi-functional optimization.
Solution Approach 2:
The patent applies feedback through the capability indication mechanism where the wireless communication device provides information about its measurement capabilities to the network node. This feedback loop enables the network node to configure measurement gaps that are optimized for the specific device, ensuring that measurement opportunities are maximized within the latency constraints imposed by the device's processing and transmission capabilities.
Data Source
AI summary
A method a wireless communication device and a corresponding method for a network node of a cellular communication system are disclosed. The network node and the wireless communication device are configured to communicate with each other according to an automatic repeat request (ARQ) protocol having a requirement that a number of time units between reception of an ARQ packet and transmission of an associated response message is smaller than a maximum response time. According to the methods, the wireless communication device transmits at least one measurement gap adaptation signal to the network node. The network node determines a measurement gap configuration of the wireless communication device based on the measurement gap adaptation signal, wherein measurement gaps of the measurement gap configuration have a length smaller than the maximum response time. The network node transmits an indication of the measurement gap configuration to the wireless communication device, which uses the measurement gap configuration to perform measurements. Corresponding computer program product, arrangements, network node and wireless communication device are also disclosed.