Early Termination of Repeated MTC Transmissions
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Solution Overview
Problem
Existing mobile broadband networks, designed for human communications, are inefficient for machine type communication (MTC) due to high resource usage and power consumption from repeated transmissions, which contradicts the goals of reduced cost and power consumption in MTC systems.
Innovation Solution
Implementing early termination of repeated transmissions in MTC systems using Downlink Control Information (DCI) and intermediate Hybrid Automatic Repeat Request (HARQ) acknowledgement (HARQ-ACK) communications to reduce unnecessary retransmissions, thereby saving resources and power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated transmissions are performed to ensure reliable data delivery in MTC systems, then reliability is improved, but power consumption and resource usage increase
Solution Approach 1:
The patent implements feedback mechanisms where the receiving device sends acknowledgment signals (ACK/NACK) to the transmitting device after each transmission attempt. This feedback allows the transmitting device to determine whether to continue retransmissions or terminate early, thereby avoiding unnecessary power consumption while ensuring reliable data delivery only when required.
Solution Approach 2:
The patent introduces dynamic adaptation of transmission parameters including variable retransmission counts, adjustable transmission power levels, and flexible timing configurations. These dynamic parameters allow the system to optimize between reliability and power consumption based on real-time channel conditions and device capabilities, preventing fixed repeated transmissions from causing excessive power drain.
2Reliability
If repeated transmissions are performed to ensure reliable data delivery, then reliability is improved, but system resource usage increases
Solution Approach 1:
Feedback mechanisms enable the system to terminate retransmissions early when data is successfully decoded, freeing up system resources (time slots, frequency resources, processing capacity) for other transmissions. This dynamic resource management based on feedback prevents wasteful occupation of system resources by already-successfully-delivered data.
Solution Approach 2:
The patent employs parameter changes including variable retransmission counts, adjustable modulation and coding schemes, and flexible resource allocation. By dynamically changing these parameters based on channel conditions and device status, the system optimizes resource efficiency while maintaining reliability, avoiding fixed resource allocation that would waste capacity on successful transmissions.
3Use of energy by moving object
If early termination of repeated transmissions is implemented, then power consumption and resource usage are reduced, but device complexity increases
Solution Approach 1:
The patent implements self-service mechanisms where devices autonomously determine transmission termination based on pre-configured parameters and received feedback, without requiring complex centralized control. Each device independently manages its transmission lifecycle by monitoring acknowledgments and comparing against configured thresholds, reducing protocol complexity while achieving power savings.
Solution Approach 2:
The patent applies preliminary action by pre-configuring transmission parameters including maximum retransmission counts, power levels, and timing settings before actual data transmission begins. This preliminary configuration simplifies the transmission process by eliminating the need for complex real-time decision-making, reducing device complexity while enabling early termination capabilities.
4Productivity
If early termination of repeated transmissions is implemented, then spectral efficiency is improved, but device complexity increases
Solution Approach 1:
Devices autonomously manage transmission termination based on feedback and pre-configured parameters, enabling efficient spectral utilization without complex centralized coordination. Each device independently decides when to terminate transmissions based on local observations, improving spectral efficiency while keeping protocol complexity manageable through decentralized self-service mechanisms.
Solution Approach 2:
By pre-configuring transmission parameters and termination criteria before data transmission, the system simplifies the protocol complexity required to achieve high spectral efficiency. The preliminary setup establishes clear rules for transmission behavior, allowing devices to efficiently utilize spectral resources without requiring complex real-time protocol negotiations or centralized control mechanisms.
Data Source
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AI summary
Systems, apparatus, user equipment (UE), evolved node B (eNB), and methods are described for machine-type communications (MTC) with early termination of repeated transmissions. In MTC implementations with narrow bandwidth, significant numbers of retransmissions may be scheduled based on channel quality measurements. If data is successfully decoded at a receiving device while a significant number of retransmissions remain, system resources are wasted. Embodiments described herein thus use downlink control messaging or intermediate hybrid automatic repeat request (HARQ) messaging for early termination of repeated messages.