Uplink Transmission on Unlicensed Carrier via Network Contention
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Solution Overview
Problem
Current wireless communication systems lack an effective method for transmitting uplink information on unlicensed frequency bands, leading to variability in transmission time due to differing detection results among terminal equipment and complexity in maintaining time sequence relationships for acknowledgement feedback.
Innovation Solution
A method where terminal equipment determines a present time resource set for data transmission on an unlicensed carrier, allowing it to send uplink information without contending for resources, based on time resource sets obtained by network equipment through contention, which are continuously distributed and have intervals, corresponding to previous time resource sets used for downlink information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal equipment performs LBT detection before sending uplink information on unlicensed carrier, then channel access is achieved, but transmission time varies greatly among different terminal equipment
Solution Approach 1:
The network equipment performs LBT detection and contends for channel resources in advance, obtaining a time resource set before terminal equipment needs to transmit. This preliminary action by the network eliminates the need for each terminal to perform independent LBT detection, thereby ensuring reliable channel access while eliminating transmission time variability among different terminals.
2Ease of operation
If terminal equipment performs LBT detection before sending uplink information, then channel access is possible, but network complexity increases due to maintaining time sequence relationships
Solution Approach 1:
Instead of having terminal equipment perform LBT detection and the network maintaining time sequence relationships for multiple terminals, the approach is inverted: the network equipment performs LBT detection once and allocates a time resource set to all terminals. This inversion simplifies network complexity while maintaining ease of channel access for terminals.
3Adaptability or versatility
If terminal equipment contends for transmission resources on unlicensed carrier, then resource access is achieved, but transmission process becomes complex
Solution Approach 1:
The contention mechanism is extracted from the terminal equipment and relocated to the network equipment. The network equipment performs the complex contention process once and obtains a time resource set, which is then allocated to terminal equipment. This extraction eliminates the need for terminals to engage in complex contention procedures while maintaining resource access flexibility.
Data Source
AI summary
The invention discloses a method and a device for transmitting uplink information on an unlicensed carrier, and implementing uplink information transmission on the unlicensed carrier. The method comprises: a terminal device determines a current time resource set for performing data transmission on an unlicensed carrier with respect to network equipment, wherein the network equipment uses a time resource set obtained by means of competition to perform data transmission on an unlicensed carrier, each time resource set comprises continuously distributed time resources, and time resources in different time resource sets are separated by an interval; and the terminal device transmits, to the network equipment, on the unlicensed carrier using a first time resource in the current time resource set, the uplink information, wherein the uplink information corresponds to downlink information transmitted by the network equipment using at least one previous time resource set in the current time resource set.