Terminal Device Early Termination for Coverage Extension
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Solution Overview
Problem
The use of repeated message transmission for coverage extension in narrowband transmitters and receivers in mobile communications systems is problematic, as it can lead to inefficiencies and increased power consumption, particularly for low-power, low-complexity devices like those used in machine-type communications.
Innovation Solution
A terminal device and infrastructure equipment system where a first radio signal is repeatedly transmitted during consecutive time periods, with a second radio signal indicating whether to continue or terminate transmission, and having a measurable characteristic to adjust the reference radio frequency offset, allowing the terminal device to synchronize with the infrastructure equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If repeated message transmission is used for coverage extension, then radio coverage is extended, but power consumption increases
Solution Approach 1:
The infrastructure equipment provides feedback to the terminal device through downlink control information indicating whether the transmitted message was successfully received. This allows the terminal device to stop repetition transmissions early when the message is successfully received, avoiding unnecessary power consumption while maintaining extended coverage capability.
Solution Approach 2:
Instead of transmitting the maximum number of repeated messages regardless of reception status, the system performs partial action by allowing early termination of transmissions when the message is successfully received. This reduces the excessive power consumption associated with completing all planned repetitions.
2Reliability
If repeated message transmission is used for coverage extension, then communication reliability is improved, but transmission efficiency decreases
Solution Approach 1:
The infrastructure equipment sends acknowledgment feedback to the terminal device after successfully receiving a message. This feedback mechanism maintains high transmission reliability by ensuring messages are received correctly, while simultaneously improving efficiency by allowing the terminal device to terminate unnecessary repetition transmissions.
Solution Approach 2:
The transmission process is made dynamic through early termination capability. The number of repetitions is not fixed but adapts based on reception status, allowing the system to maintain reliability through sufficient repetitions while improving efficiency by stopping when success is achieved.
3Area of stationary object
If repeated message transmission is used, then coverage extension is achieved, but device complexity increases
Solution Approach 1:
The feedback mechanism from infrastructure equipment provides clear termination signals to the terminal device, simplifying the control logic needed for coverage extension. The terminal device only needs to monitor for termination indications and stop transmissions accordingly, reducing the complexity of managing repeated transmissions for coverage extension.
4Reliability
If repeated message transmission is used, then signal reception reliability is improved, but time consumption increases
Solution Approach 1:
The feedback system allows the terminal device to receive confirmation of successful message reception and terminate repetitions early. This maintains signal reception reliability through multiple transmission opportunities while reducing time consumption by avoiding unnecessary continued transmissions after successful reception.
Solution Approach 2:
The system performs partial repetitions rather than completing all planned repetitions when the message is successfully received. This reduces time consumption by performing only the necessary number of transmissions to achieve reliable delivery.
Data Source
AI summary
A terminal device comprises a transmitter, a receiver and a controller. The transmitter is configured to transmit a first radio signal to infrastructure equipment of a wireless telecommunications system, the first radio signal being repeatedly transmitted a predetermined number of times during each of a plurality of consecutive time periods, each of the consecutive time periods being separated by a separation time period. The receiver is configured to receive, from the infrastructure equipment during one of the separation time periods, a second radio signal that comprises an indicator indicating that transmission of the first radio signal should continue or that transmission of the first radio signal should be terminated and the second radio signal having a measurable characteristic on the basis of which the terminal device reduces an offset of a reference radio frequency of the terminal device relative to a transmission radio frequency of the infrastructure equipment.