Smart RAT Selection for Marginal Coverage Power
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Solution Overview
Problem
Mobile communication devices in marginal coverage areas face power consumption issues and connectivity lapses when they drop registration with a selected RAN using one RAT and fail to reconnect using another, often missing mobile terminated calls due to excessive attempts to connect via less capable RATs.
Innovation Solution
A communication device with a smart RAT selection module learns from past successes and failures to delay reconnect attempts using another RAT only when deemed unlikely to succeed, maintaining downlink communication and reducing power consumption by not attempting unsuccessful uplink connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile communication device attempts to reconnect using a less capable RAT after dropping registration with the currently selected RAN, then the device may eventually establish communication services, but the device consumes excessive power and may miss mobile terminated calls during unsuccessful reconnection attempts
Solution Approach 1:
The device monitors uplink communication quality and uses this feedback to determine when to switch RATs or delay reconnection attempts. The system continuously evaluates communication conditions and adjusts reconnection strategy based on real-time feedback about signal quality and network responsiveness.
Solution Approach 2:
The reconnection strategy dynamically adapts based on current communication conditions. The device transitions from attempting reconnection on the current RAT to delaying attempts and monitoring downlink only, based on real-time assessment of uplink quality thresholds. This dynamic adjustment optimizes power consumption while maintaining connectivity reliability.
2Adaptability or versatility
If the mobile communication device switches from the currently selected RAN using the first RAT to connect using the second RAT, then the device may establish communication services, but the device may be unable to reconnect if the first RAT was the only available option in the marginal coverage area
Solution Approach 1:
The device uses feedback from past communication successes and failures with different RATs to inform future selection decisions. By learning from historical performance data, the system can identify patterns about which RATs are likely to succeed in specific geographic locations and conditions, improving both adaptability and reconnection reliability.
Solution Approach 2:
The device performs preliminary assessment of available RATs before attempting reconnection, using stored communication information to predict which RAT is most likely to succeed. This preliminary action prevents futile reconnection attempts and ensures the device switches to a RAT that has demonstrated reliability in similar conditions.
3Measurement precision
If the mobile communication device monitors both uplink and downlink communication quality continuously, then the device can make informed decisions about RAT selection, but the device increases power consumption due to continuous monitoring
Solution Approach 1:
The device performs partial monitoring by focusing only on downlink communication quality when uplink quality is insufficient, rather than continuously monitoring both uplink and downlink. This partial action reduces power consumption while still providing sufficient information for informed RAT selection decisions in marginal coverage areas.
Solution Approach 2:
The monitoring strategy dynamically adjusts based on current communication conditions. When uplink quality falls below the threshold, the device transitions from monitoring both uplink and downlink to monitoring only downlink, reducing power consumption while maintaining adequate measurement precision for decision-making.
Data Source
AI summary
A communication device mitigates power consumption and communication connectivity lapses in a marginal coverage area with unsatisfactory transmit communication quality and satisfactory receive communication quality of respective uplink and downlinks with a radio access network (RAN) using a first radio access technology (RAT). Based on information of past communication success and failure, a controller of the communication device determines whether communication services can be successfully obtained from the RAN using a second RAT. In response to determining that communication services cannot be successfully obtained using the second RAT, the communication device monitors the downlink with the first RAN using the first RAT to receive any mobile terminated calls. In addition, the communication delays, for a preset period of time, any attempt to establish uplink communication using one of the first and second RATs that are expected to be unsuccessful in the marginal coverage area.