MTC UE PUCCH Frequency Hopping for Retuning Gaps
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Solution Overview
Problem
Machine-type communication (MTC) user equipment (UE) in wireless communication systems faces challenges in efficiently handling frequency retuning, especially when switching between narrowbands, which affects the reliability of transmissions and coverage, particularly in environments with limited coverage.
Innovation Solution
A method and apparatus for MTC UE that determines a physical uplink control channel (PUCCH) resource across multiple subframes, subject to frequency hopping, regardless of the number of repetitions and starting subframe, to manage frequency retuning gaps effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping is utilized for MTC UE transmissions, then transmission reliability and coverage are improved, but frequency retuning gaps cause transmission interruptions and reduce efficiency
Solution Approach 1:
The patent applies preliminary action by determining PUCCH resources subject to frequency hopping in advance across multiple subframes, regardless of the number of repetitions and starting subframe. This pre-determination allows the MTC UE to plan frequency retuning gaps beforehand, avoiding transmission interruptions and maintaining both reliability and efficiency.
2Use of energy by moving object
If the operating frequency bandwidth of MTC UE is reduced to lower cost and battery consumption, then device cost and energy usage are improved, but frequency retuning becomes more critical and complex
Solution Approach 1:
The patent applies parameter changes by making the PUCCH resource allocation dependent on frequency hopping parameters across multiple subframes. The resource determination incorporates the number of repetitions and starting subframe as variables, allowing the system to adapt to different bandwidth configurations without increasing hardware complexity.
3Use of energy by moving object
If MTC UE goes into sleep mode after data transmission to conserve energy, then battery consumption is improved, but channel estimation and frequency synchronization become less effective
Solution Approach 1:
The patent applies periodic action by scheduling PUCCH transmissions with frequency hopping across multiple subframes. This periodic transmission pattern ensures that the MTC UE maintains channel estimation and frequency synchronization at regular intervals without requiring continuous operation, allowing the device to enter sleep mode between transmissions while maintaining communication reliability.
Data Source
AI summary
A method and apparatus for transmitting a physical uplink control channel (PUCCH) in a wireless communication system is provided. A machine-type communication (MTC) user equipment (UE) determines a PUCCH resource in a plurality of subframes. The PUCCH resource is subject to frequency hopping across the plurality of subframes regardless of a number of repetition of PUCCH transmission and a starting subframe of the PUCCH transmission. The UE transmits the PUCCH by using the PUCCH resource to a network.