Uplink Scheduling-Free Resource Pool Segmentation for Inter-Cell Interference
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Solution Overview
Problem
In massive Machine Type Communications (mMTC) scenarios, non-orthogonal uplink scheduling-free transmission schemes face challenges in reducing inter-cell interference, which increases due to simultaneous data transmission from a large number of User Equipments (UEs) and cannot be effectively mitigated by interference coordination.
Innovation Solution
Dividing Multiple Access (MA) resources into groups of MA resource pools, allowing User Equipments to select from these pools based on signal quality measurements, thereby reducing inter-cell interference without decreasing available resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large quantity of User Equipments perform data transmission simultaneously using random MA resource selection, then the connection capacity and coverage are improved, but the inter-cell interference increases dramatically
Solution Approach 1:
The patent divides MA resources into multiple groups (first group and second group) with different properties. UEs in different cells are directed to select from different resource groups, thereby segmenting the overall resource pool into cell-specific subsets. This segmentation reduces the probability of resource collision and inter-cell interference while maintaining overall connection capacity.
Solution Approach 2:
The patent assigns different MA resource groups to different cells, creating local resource quality differences. Each cell has its own preferred resource group characteristics, and UEs within each cell select resources from their local group. This local quality differentiation ensures that UEs in different cells use different resources, reducing inter-cell interference while preserving connection capacity.
2Object-generated harmful factors
If MA resources are divided into groups and configured to obtain multiple MA resource pools, then the inter-cell interference is reduced, but the device complexity increases
Solution Approach 1:
The base station divides MA resources into multiple groups and configures different MA resource pools for different cells. This segmentation approach reduces inter-cell interference by ensuring that UEs in different cells select from different resource groups, thereby minimizing resource collisions and interference while managing complexity through structured organization.
3Reliability
If advanced receiver is adopted to eliminate inter-cell interference, then the reception performance is improved, but the device complexity and cost increase
Solution Approach 1:
Instead of using complex advanced receivers to eliminate inter-cell interference at the reception side, the patent inverts the approach by preventing interference generation at the transmission side through differentiated MA resource group configuration. UEs in different cells are directed to use different resource groups, so interference is avoided before it occurs, eliminating the need for complex interference cancellation receivers.
Data Source
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AI summary
An uplink scheduling-free transmission method and an uplink scheduling-free transmission device are provided. The uplink scheduling-free transmission method includes: dividing, by a base station, MA resources into groups of MA resources, and configuring, by the base station, the groups of MA resources to obtain at least two groups of MA resource pools, wherein at least parts of respective MA resources in the at least two groups of MA resource pools are different from each other; and notifying, by the base station, a UE of the at least two groups of MA resource pools, to enable the UE to select an MA resource pool from the at least two groups of MA resource pools, wherein the selected MA resource pool is to be used by the UE.