PUCCH Resource Determination for MTC Uplink Control
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Solution Overview
Problem
Machine Type Communication (MTC) devices in LTE-A networks face challenges in receiving physical channels and transmitting uplink control channels due to extended cell coverage, leading to performance issues and increased costs, as they struggle to decode PDCCH, EPDCCH, PDSCH, and PUCCH signals effectively.
Innovation Solution
A method for MTC devices to repeatedly transmit PUCCH on determined resources over multiple subframes, using explicit configuration information from higher-layer signaling, based on PDCCH, EPDCCH, and terminal ID, to enhance reception and decoding performance by scheduling PDSCH and including ACK/NACK information, and maintaining consistent PUCCH resources during transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If MTC devices use general transmission methods for PUCCH and PUSCH, then device complexity is reduced, but base station reception performance deteriorates in coverage enhancement regions
Solution Approach 1:
The patent changes transmission parameters including PUCCH resource allocation, repetition factors, and power control parameters to optimize uplink transmission for MTC devices in coverage enhancement regions, thereby improving base station reception performance without significantly increasing device complexity
Solution Approach 2:
The patent implements periodic repetition of PUCCH transmissions across multiple subframes with configured repetition factors, allowing base stations to accumulate and combine signals from MTC devices, thereby improving reception reliability while maintaining manageable device complexity through standardized periodic patterns
2Device complexity
If base station transmits channels using general methods, then transmission complexity is reduced, but MTC device reception performance deteriorates in coverage enhancement regions
Solution Approach 1:
The patent modifies downlink transmission parameters including PDCCH/EPDCCH aggregation levels, PDSCH modulation and coding schemes, and reference signal configurations to enhance signal detectability for MTC devices in coverage enhancement regions, improving reception performance while keeping base station transmission complexity manageable through parameter optimization
Solution Approach 2:
The patent configures MTC devices with advance knowledge of PUCCH resources, repetition factors, and transmission parameters through higher-layer signaling before actual transmission, allowing devices to prepare appropriate reception and transmission settings, thereby improving reception performance without requiring complex real-time processing at the base station
3Reliability
If PUCCH is repeatedly transmitted over multiple subframes, then reception reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The patent establishes universal resource allocation rules and formulas that can be applied across different MTC devices and scenarios, where PUCCH resources are systematically determined based on downlink grant indices and configured parameters, thereby improving transmission reliability through repetition while keeping resource allocation complexity manageable through standardized multi-device applicable rules
Data Source
AI summary
A disclosure of the present specification provides a method for transmitting a physical uplink control channel (PUCCH) by a terminal. The method may comprise the steps of: receiving multiple pieces of explicit configuration information on a PUCCH resource through higher layer signaling when a PUCCH should be repeatedly transmitted on a plurality of sub-frames; determining a PUCCH resource to which the PUCCH is transmitted, on the basis of the multiple pieces of the explicit configuration information; and repeatedly transmitting, onto the determined PUCCH resource, the PUCCH on the plurality of sub-frames, wherein the PUCCH resource to which the PUCCH is transmitted is determined on the basis of one of a PDCCH, an EPDCCH, and an identification (ID) of the terminal, which have been received previously.