Grant-Free Transmission Device Using Orthogonal Identification Signals
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Solution Overview
Problem
In contention-based radio communication technologies, a large number of terminal apparatuses sharing a frequency resource experience significant interference due to non-orthogonal multiplexing in the spatial domain, degrading transmission performance as the number of terminal apparatuses increases.
Innovation Solution
A transmission device and method that transmit data signals without receiving control information, using identification signals multiplexed on orthogonal resources, and receiving transmission parameters in advance to indicate the use of continuous or discontinuous frequency resources, allowing for efficient data transmission based on these parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large number of terminal apparatuses share a frequency resource using contention-based radio communication technology, then the control information overhead is reduced and data transmission speed is improved, but the interference among non-orthogonally multiplexed signals increases and transmission performance degrades
Solution Approach 1:
The frequency resource is segmented into multiple frequency bands, and terminal apparatuses are assigned to different frequency bands for data transmission. This segmentation reduces the number of terminals sharing the same frequency resource, thereby reducing interference among non-orthogonally multiplexed signals while maintaining efficient data transmission.
2Reliability
If control information is transmitted and received before data transmission in conventional radio communication technology, then transmission authorization is properly managed, but the control information overhead increases significantly especially for small data transmissions
Solution Approach 1:
The essential control function is extracted from the conventional SR-UL Grant procedure. Instead of requiring separate control information exchange, the invention uses pre-configured frequency band assignments and simple uplink grant-free transmission, removing the overhead of control information while maintaining transmission authorization through resource pre-allocation.
Solution Approach 2:
Frequency band assignments and transmission parameters are predetermined and configured in advance for terminal apparatuses. This preliminary action eliminates the need for real-time control information exchange before each data transmission, reducing overhead while ensuring proper resource management.
3Productivity
If multiple terminal apparatuses transmit data signals simultaneously on the same frequency resource, then the data transmission efficiency is improved, but the residual interference after reception processing degrades transmission performance
Solution Approach 1:
The system segments the frequency resource into multiple bands and assigns different terminal apparatuses to different segments. This reduces the number of simultaneous transmissions on any single frequency resource, minimizing residual interference while maintaining overall system throughput and transmission efficiency.
Data Source
AI summary
In a case that a large number of terminal apparatuses accommodated in a contention based radio communication technology share a frequency resource, the number of data signals of the terminal apparatuses which are non-orthogonally multiplexed in the spatial domain increases. Therefore, in a case that the number of non-orthogonally multiplexed data signals of the terminals is considerably large, residual interference after removing interference in the reception processing degrades transmission performance. A transmission device for transmitting a data signal to a reception device includes a transmission processing unit configured to transmit the data signal without receiving SR transmission and control information for transmission authorization transmitted by the reception device, an identification signal multiplexing unit configured to multiplex an identification signal on an orthogonal resource, and a control information receiving unit configured to receive in advance a transmission parameter associated with the data signal transmission. The transmission parameter includes any of a first data transmission to transmit the data signal by using a continuous frequency resource and a second data transmission to transmit the data by using a discontinuous and equal interval frequency resource.