Scheduling Request Transmission for Low-Capability Devices
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Solution Overview
Problem
Current mobile communication technologies, such as 3GPP LTE, face challenges in efficiently managing scheduling requests (SR) from low-cost/low-capability devices, particularly in machine-type communication (MTC) scenarios where devices operate on reduced bandwidth, requiring innovative methods for SR transmission and resource allocation.
Innovation Solution
A method for a low-cost/low-capability device to receive higher-layer signals containing SR transmission periodicity and subframe offset information, determining subframes for SR transmission, and repeatedly transmitting SRs, with options for joint encoding with HARQ ACK/NACK and periodic CSI, optimizing SR transmission in reduced bandwidth conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If MTC devices operate on reduced bandwidth (e.g., 1.4 MHz sub-band), then device cost is reduced, but SR transmission efficiency deteriorates due to limited resource availability
Solution Approach 1:
The patent implements periodic SR transmission with configurable periods and subframe offsets. The LC device transmits SR at regular intervals determined by higher-layer signaling, allowing efficient utilization of limited bandwidth resources while maintaining reliable scheduling request delivery for MTC devices operating in reduced bandwidth scenarios
Solution Approach 2:
The patent pre-configures SR transmission parameters including periodicity, subframe offset, and repetition number through higher-layer signaling before actual SR transmission. This preliminary configuration allows the LC device to efficiently transmit SR without complex real-time decision-making, optimizing performance in reduced bandwidth conditions
2Reliability
If SR is repeatedly transmitted on multiple subframes, then SR reliability is improved, but uplink resource consumption increases
Solution Approach 1:
The patent dynamically adjusts SR transmission parameters including repetition number, periodicity, and subframe offset based on network conditions and device requirements. Higher-layer signaling configures these parameters to optimize the balance between SR transmission reliability and uplink resource consumption for LC devices
Solution Approach 2:
The patent implements dynamic SR transmission where the repetition number and periodicity can be adjusted based on whether HARQ ACK/NACK transmission is required. The system adapts SR transmission behavior to current communication needs, transmitting SR multiple times when reliability is critical and reducing repetitions when resources are constrained
3Productivity
If SR is joint-encoded with HARQ ACK/NACK and periodic CSI, then uplink control information efficiency is improved, but encoding complexity increases
Solution Approach 1:
The patent combines SR with HARQ ACK/NACK and/or periodic CSI into a single joint-encoded transmission when multiple uplink control information elements need to be sent simultaneously. This merging approach improves uplink control information efficiency by transmitting multiple messages in one opportunity, though it increases encoding complexity for LC devices
Data Source
AI summary
The present description provides a method for transmitting a scheduling request (SR) in a low-capability (LC) or low-cost (LC) device. The method can comprise a step for receiving an upper layer signal comprising an SR subframe offset and an SR transmission period. The upper layer signal can further comprise information about the number of repetitions. Also, the method can comprise the steps of: determining, on the basis of the SR transmission period and SR subframe offset, a subframe on which the SR is to be transmitted; determining the number of repeated transmissions of the SR on the basis of the information; and transmitting the SR on the determined subframe. The SR can repeatedly be transmitted on a plurality of subframes that begin from the determined subframe.