Grant-Free Transmission Sequence Mapping for Resource Utilization
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Solution Overview
Problem
In wireless communications systems, particularly in LTE, determining an effective time-frequency resource for grant-free access is challenging due to the lack of dynamic scheduling instructions, leading to inefficient use of radio transmission resources.
Innovation Solution
A method where a terminal device determines a target time-frequency resource for grant-free transmission by selecting a sequence corresponding to the resource, allowing the network device to identify the resource used for grant-free access without additional signaling, thereby simplifying the transmission process and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If user equipment performs uplink transmission access independently without dynamic scheduling instructions in grant-free access mode, then transmission access speed is improved, but radio transmission resource utilization deteriorates
Solution Approach 1:
The terminal device independently selects time-frequency resources and sequences for grant-free transmission without requiring dynamic scheduling instructions from the base station. The terminal autonomously determines transmission parameters based on pre-configured resource pools and mapping relationships, enabling self-service access while maintaining resource efficiency through structured resource allocation frameworks
Solution Approach 2:
The base station pre- configures multiple time-frequency resource pools and establishes mapping relationships between sequences and resources before grant-free transmission occurs. Terminal devices select from these pre-prepared resources based on transmission needs, allowing rapid access while ensuring resource allocation follows network-defined patterns that optimize overall utilization
2Adaptability or versatility
If multiple time-frequency resources are allocated for grant-free transmission, then resource flexibility is improved, but device complexity for resource management deteriorates
Solution Approach 1:
The available time-frequency resources are divided into multiple distinct resource pools, each potentially optimized for different transmission scenarios. Sequence resources are also segmented and mapped to specific resource pools through defined mapping relationships. This segmentation allows terminal devices to select appropriate resources based on transmission requirements while following simple selection rules, maintaining low complexity despite resource diversity
Solution Approach 2:
The mapping relationship between sequences and time-frequency resources serves multiple functions: it enables resource indication, facilitates base station detection, and supports resource allocation management. This multi-functional mapping mechanism reduces the need for separate signaling and management procedures, thereby reducing device complexity while maintaining resource flexibility
Data Source
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AI summary
Embodiments of this application provide a grant-free transmission method, a terminal device, and a network device. The method includes: determining, by a terminal device, a target time-frequency resource used for grant-free transmission from a plurality of time-frequency resources; determining, by the terminal device based on information about the target time-frequency resource and a correspondence between a time-frequency resource and a sequence, a sequence corresponding to the target time-frequency resource; and performing, by the terminal device, the grant-free transmission with the network device on the target time-frequency resource based on the sequence corresponding to the target time-frequency resource. In this way, the network device can effectively determine, based on the sequence sent by the terminal device, a time-frequency resource used by the terminal device for the grant-free transmission.