Wireless Device Mobility State Configuration for Power Conservation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mobility procedures for wireless communication systems are inefficient for devices in low or no mobility states, leading to unnecessary resource consumption and power wastage, particularly in Machine Type Communication (MTC) devices that are often power-constrained and deployed in remote locations.
Innovation Solution
Defining new mobility states and optimizing mobility procedures for low or no mobility states, including reduced measurement frequencies, scaled-down timers, and configuration parameters to conserve power and network resources, with the wireless transmit/receive unit (WTRU) determining and transitioning between these states based on signal quality and network parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If standard mobility procedures are implemented for all devices, then network coverage and connectivity are maintained, but power consumption and signaling overhead increase unnecessarily for low mobility devices
Solution Approach 1:
The patent implements dynamic mobility procedures by introducing multiple mobility states (normal mobility state and low mobility state) that allow devices to transition between different operational modes based on their actual movement characteristics. In the low mobility state, devices perform reduced measurements and use extended timers, dynamically adapting the mobility procedure intensity to match the device's actual mobility level, thereby reducing power consumption while maintaining adequate network connectivity.
Solution Approach 2:
The patent changes key mobility parameters based on the device's mobility state. In the low mobility state, measurement frequencies are reduced, timers are extended, and cell reselection criteria are modified. These parameter changes allow the device to operate with lower power consumption while the network maintains appropriate connectivity through state-aware handling of these modified parameters.
2Reliability
If frequent cell reselection and mobility procedures are performed, then network connectivity is maintained, but signaling overhead and network resource consumption increase
Solution Approach 1:
The patent applies partial action by implementing reduced mobility procedures for devices in the low mobility state. Instead of performing full measurement and reporting procedures, devices in this state perform only essential connectivity-maintaining actions with reduced frequency. This partial execution of mobility procedures suffices to maintain network connectivity for low mobility devices while significantly reducing signaling overhead.
Solution Approach 2:
The patent segments mobility procedures into different levels based on device state. The normal mobility state includes complete measurement and reporting procedures, while the low mobility state includes a simplified subset of these procedures. This segmentation allows the network to handle different device types appropriately, maintaining connectivity where needed while reducing unnecessary signaling for low mobility devices.
3Measurement precision
If standard mobility measurement frequencies are used, then accurate location tracking is achieved, but power consumption increases for stationary or slow-moving devices
Solution Approach 1:
The patent makes measurement frequencies dynamic based on the device's mobility state. Devices in the low mobility state use extended measurement periods and reduced measurement frequencies, while still performing measurements sufficient to detect when mobility conditions change. This dynamic adjustment maintains adequate location tracking accuracy for the device's actual mobility level while significantly reducing power consumption compared to standard high-frequency measurements.
Data Source
AI summary
Mobility states are defined in order to prevent excess signaling overhead and to conserve power on a wireless transmit/receive unit (WTRU) in a wireless network. The WTRU may determine that is operating in a low mobility state based on triggers related to the frequency of movement of the WTRU between network cells. The WTRU may change cells less frequently in a low or no mobility state than in a normal mobility state. Upon determining that the WTRU is in the low or no mobility state, the WTRU may configure mobility procedures associated with the low or no mobility state in order to conserve power and other network resources. The WTRU may coordinate its mobility state with the network.