System Information Scheduling for MTC Devices
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Solution Overview
Problem
Current LTE systems face challenges in efficiently transmitting and receiving system information, particularly for Machine-Type Communications (MTC) devices, which leads to increased power consumption and network load due to repetitive transmissions and unnecessary data reception.
Innovation Solution
The proposed solution involves transmitting system information configuration information that indicates the location of system information in predetermined subframes, using a bitmap with bits representing whether system information is present in each subframe, allowing MTC devices to receive system information only in designated subframes and reducing unnecessary receptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information is transmitted repetitively in all subframes, then system information availability is improved, but power consumption in MTC devices increases
Solution Approach 1:
The patent segments the subframes into two categories: MTC subframes where system information is transmitted, and non-MTC subframes where it is not. This segmentation allows MTC devices to selectively receive system information only in designated subframes, reducing power consumption while maintaining information availability.
Solution Approach 2:
The patent implements periodic transmission of system information in predetermined MTC subframes rather than continuous transmission in all subframes. This periodic approach reduces the overall transmission load and allows MTC devices to enter sleep modes between designated subframes, thereby reducing power consumption.
2Reliability
If system information is transmitted in all subframes, then system information reception reliability is improved, but network load increases
Solution Approach 1:
The patent extracts system information transmission from all subframes and concentrates it only in designated MTC subframes. This extraction reduces the quantity of transmitted data across the network while ensuring that MTC devices can still reliably receive the information in the designated subframes.
3Measurement precision
If MTC devices perform blind decoding in all subframes, then system information detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent provides preliminary information to MTC devices about which subframes are designated for MTC communication and system information transmission. This preliminary knowledge allows devices to skip blind decoding in non-MTC subframes, reducing power consumption while maintaining detection accuracy in the designated MTC subframes.
Data Source
AI summary
The present disclosure relates to an apparatus for receiving system information in a wireless communication system including a receiver that receives system information configuration information and receives system information in predetermined subframes of a radio interface, and a controller that determines the predetermined subframes according to the received system information configuration information and controls the receiver to receive the system information in the predetermined subframes, wherein the system information configuration information includes a subframe scheduling field with a plurality of bits, each bit being associated with a subframe and representing whether or not system information is to be received in that subframe. The present disclosure further relates to a corresponding apparatus for transmitting system information and to the respective receiving and transmitting methods.