LTE Base Station Wireless Resource Scheduling for MTC Congestion
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Solution Overview
Problem
The rapid increase in Machine Type Communication (MTC) devices in LTE networks leads to congestion in the random access channel due to high collision probabilities and time delays, as conventional mechanisms rely on contention-based resource requests, which are inefficient for large numbers of devices.
Innovation Solution
An LTE base station with a transceiver and processor that schedules wireless resources in advance by determining transmission time instants based on transmission periods, tolerable time shifts, and required resource amounts, allowing MTC devices to transmit data without contention-based random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If contention-based random access procedure is used for resource request, then MTC apparatuses can request resources independently, but collision probability increases and time delay occurs when large amounts of MTC apparatuses transmit simultaneously
Solution Approach 1:
The base station performs preliminary scheduling of transmission time instants for multiple MTC apparatuses before they actually transmit data. By pre-allocating specific time slots to different apparatuses based on their transmission periods and tolerable time shifts, the system eliminates collisions that would occur with contention-based access, while still allowing each apparatus to operate independently within its allocated time window
2Adaptability or versatility
If contention-based random access procedure is used for resource request, then MTC apparatuses can request resources flexibly, but time delay increases due to multiple preambles needed for successful acceptance
Solution Approach 1:
The base station determines and notifies MTC apparatuses of their designated transmission time instants in advance, before the actual data transmission occurs. This preliminary scheduling action eliminates the iterative preamble exchange process, reducing time delay while maintaining flexibility through the tolerable time shift parameter that allows apparatuses to adapt their transmissions within acceptable bounds
Solution Approach 2:
Each MTC apparatus autonomously determines its transmission time instant based on the scheduling information received from the base station, its own transmission period, and tolerable time shift. This self-service mechanism allows flexible resource utilization without requiring continuous base station intervention, reducing time delay while maintaining adaptability
3Adaptability or versatility
If conventional transmission mechanisms are used for MTC apparatuses, then system compatibility is maintained, but high collision probability and too many random access channel instructions occur when numerous MTC apparatuses are served
Solution Approach 1:
The base station implements preliminary scheduling that determines specific transmission time instants for each MTC apparatus within scheduling intervals. This approach maintains LTE system compatibility by operating within the existing random access framework, while dramatically improving productivity by eliminating the need for multiple preamble transmissions and reducing random access channel congestion through coordinated time slot allocation
Data Source
AI summary
A long term evolution (LTE) base station and wireless resource scheduling method thereof are provided. The LTE base station receives a transmission period, a tolerable time shift, a start transmission time instant, and a required resource amount from each of a plurality of machine type communication apparatuses. The LTE base station decides a scheduling time length according to the transmission periods, decides a scheduling interval according to a start scheduling time instant and the scheduling time length, decides at least one transmission time instant for each machine type communication apparatus according to the transmission periods, the tolerable time shifts, the start transmission time instants, and the required resource amounts, and transmits each of the at least one transmission time instant to the corresponding machine type communication apparatus so that each of the machine type communication apparatus transmits data according to the corresponding at least one transmission time instant.