3GPP Node CEM Coordination for UE Connection Reliability
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Solution Overview
Problem
Coverage-challenged user equipment (UE) in LTE systems face difficulties in determining when a network node is in coverage enhancement mode, leading to wasted energy and unsuccessful connection attempts due to the lack of coordination between nodes and UEs.
Innovation Solution
Implementing a coordination mechanism between network nodes and UEs to schedule predetermined and dynamic coverage enhancement mode periods, allowing UEs to receive system information and connect only during scheduled CEM times, thereby reducing energy waste and improving connection success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network node operates in coverage enhancement mode continuously to help coverage-challenged UEs connect, then connection success rate for coverage-challenged UEs is improved, but bandwidth available for other UEs is reduced and energy consumption increases
Solution Approach 1:
The network node operates in coverage enhancement mode during periodic time intervals rather than continuously. The node enters CEM at predetermined reference times for each LTE frequency band and maintains it for specified durations, allowing other UEs to utilize bandwidth during non-CEM periods while ensuring coverage-challenged UEs can connect during scheduled CEM periods.
2Reliability
If the network node operates in coverage enhancement mode for extended periods to assist coverage-challenged UEs, then connection success rate is improved, but energy consumption of the network node increases
Solution Approach 1:
The network node activates coverage enhancement mode periodically at predetermined reference times rather than maintaining it continuously. Each CEM period is maintained for a specific duration sufficient for coverage-challenged UEs to connect, then the node exits CEM to conserve energy, creating a balanced operation between reliability and energy efficiency.
3Productivity
If the network node does not provide coverage enhancement mode to maintain bandwidth for other UEs, then bandwidth availability is improved, but coverage-challenged UEs cannot connect successfully
Solution Approach 1:
The network node schedules coverage enhancement mode operations periodically at predetermined reference times, ensuring that coverage-challenged UEs have guaranteed opportunities to connect while the node operates in normal mode during other periods to maintain maximum bandwidth availability for all UEs.
4Adaptability or versatility
If coverage-challenged UEs attempt to connect without knowing when CEM periods are scheduled, then connection flexibility is improved, but energy is wasted on unsuccessful connection attempts
Solution Approach 1:
The network node broadcasts system information messages in advance that contain dynamic CEM scheduling information, allowing coverage-challenged UEs to know when CEM periods are scheduled before attempting connections. This preliminary information provision enables UEs to plan their connection attempts efficiently, avoiding wasted energy on unsuccessful attempts during non-CEM periods.
Data Source
AI summary
Systems and methods provide coordination between a 3GPP node and user equipment (UE) for coverage enhancement modes (CEM). At predetermined reference times, the node enters CEM and broadcasts dynamic CEM scheduling information. A UE with CEM capability may attempt to connect to the node at the predetermined reference times and other times indicated in the dynamic CEM scheduling information.