MTC Uplink PUCCH PUSCH Overlap Handling
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Solution Overview
Problem
Machine Type Communication (MTC) User Equipment (UE) faces challenges in reliably and efficiently transmitting Uplink Control Information (UCI) and user data, particularly in scenarios where UCI is transmitted periodically or aperiodically, due to overlapping Physical Uplink Control Channels (PUCCH) and Physical Uplink Shared Channels (PUSCH), which affects transmission power and channel allocation.
Innovation Solution
A method is introduced where the MTC UE determines overlap between PUCCH and PUSCH in subframes and multiplexes UCI with PUSCH, increasing transmission power based on the number of subframes and Resource Elements (REs) allocated, and allocates UCI positions adjacent to reference signals, ensuring reliable uplink transmission by piggybacking UCI with user data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UCI is transmitted on separate PUCCH resources, then control information reliability is improved, but uplink transmission efficiency deteriorates due to resource overlap and power allocation complexity
Solution Approach 1:
The patent combines control information (UCI) and user data transmission by multiplexing UCI onto PUSCH resources. Instead of transmitting UCI and user data on separate channels (PUCCH and PUSCH), the control information is embedded within the uplink shared channel, eliminating resource conflicts and simplifying power allocation while maintaining transmission reliability.
2Reliability
If transmission power is increased for UCI, then control information reliability is improved, but overall power efficiency deteriorates
Solution Approach 1:
By merging UCI transmission with user data transmission on the same PUSCH channel, the patent eliminates the need for separate high-power control channel transmission. The power allocation is unified and optimized for the combined data stream, reducing overall power consumption while ensuring control information is transmitted with sufficient reliability through the shared channel.
3Productivity
If PUCCH and PUSCH are transmitted simultaneously, then control information and user data are transmitted in parallel, but resource allocation complexity increases
Solution Approach 1:
The patent extracts the control information transmission function from the separate PUCCH channel and integrates it into the PUSCH channel. This eliminates the need for complex resource allocation and coordination between two separate uplink channels, simplifying the system while maintaining the ability to transmit both control information and user data in the same uplink transmission.
Data Source
AI summary
A method for performing uplink transmission by a Machine Type Communication (MTC) User Equipment (UE) in a wireless access system supporting an MTC is discussed. The method performed by the MTC UE includes repeatedly transmitting a Physical Uplink Control Channel (PUCCH) N1 times during N1 subframes, where N1 is an integer larger than 1, and repeatedly transmitting a Physical Uplink Shared Channel (PUSCH) N2 times during N2 subframes, where N2 is an integer larger than 1, wherein if at least one of the N2 subframes is overlapped with at least one of the N1 subframes, the MTC UE transmits only the at least one of the N1 PUCCHs at the at least one overlapped subframe.