Grant-Free Resource Collision Avoidance via Identification Segmentation
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Solution Overview
Problem
Current communication systems using grant-free resources for data transmission face collisions and demodulation failures due to contention among multiple terminal devices, leading to poor system performance and high overhead in scheduling requests.
Innovation Solution
A method where terminal devices transmit identification information on a separate resource to indicate data availability on a grant-free resource, allowing network devices to demodulate identification and allocate resources efficiently, reducing collisions and improving system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple terminal devices share grant-free resources for data transmission, then resource utilization is improved, but collision probability increases
Solution Approach 1:
The patent segments the transmission resources into two distinct parts: identification information resources and data transmission resources. Terminal devices first transmit identification information on dedicated resources, allowing the network device to detect which terminals have data to send. This segmentation enables the network to manage multiple terminals on grant-free resources without direct collisions, as the identification phase separates the contention resolution from the actual data transmission phase.
2Quantity of substance
If identification information is transmitted together with data on the same resource, then transmission overhead is reduced, but demodulation accuracy deteriorates
Solution Approach 1:
The patent divides the transmission into separate segments: identification information is transmitted on one resource while data is transmitted on another resource. This segmentation allows the network device to first demodulate identification information to determine which terminals have data, and then separately demodulate the data from those identified terminals. This approach maintains demodulation accuracy by preventing interference between identification signals and data signals, while the overall overhead is managed through efficient resource allocation.
Solution Approach 2:
The identification information acts as an intermediary that mediates between multiple terminal devices and the network device. By first transmitting identification information that indicates data availability, terminals enable the network to selectively demodulate data only from terminals that have data to send. This intermediary mechanism improves demodulation accuracy by preventing the network from attempting to demodulate data from terminals that have no data, thereby avoiding wasted resources and potential interference.
3Reliability
If dynamic scheduling is used for each terminal device, then transmission reliability is improved, but scheduling latency increases
Solution Approach 1:
The patent implements preliminary action by having terminal devices transmit identification information in advance before actual data transmission. This identification information indicates whether the terminal has data to send. The network device uses this advance information to prepare for selective demodulation, determining which terminals have data before the data transmission phase begins. This preliminary identification step enables efficient resource allocation and reduces scheduling latency while maintaining reliability through selective demodulation.
Data Source
AI summary
A method for transmitting data comprises: determining, by a first terminal device, that there are first data to be transmitted; transmitting, by the first terminal device, identification information of the first terminal device on a second resource, wherein the identification information of the first terminal device indicates that the first terminal device has data to be transmitted on a first resource which is a grant-free resource dedicated to transmitting data of a plurality of terminal devices including the first terminal device, wherein the second resource is a resource for transmitting identification information of each of at least one terminal device including the first terminal device, wherein the second resource does not overlap with the first resource; transmitting, by the first terminal device, the first data on the first resource.