Hierarchical Signature Assignment for NoMA Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing inter-beam and intra-beam interference in non-orthogonal multiple access (NoMA) technologies, which affect data communication quality and channel diversity exploitation.
Innovation Solution
The method involves classifying user equipment (UEs) into groups based on communication conditions and assigning device-based and group-based signatures to each UE, which are then used to generate wireless signals that mitigate interference and exploit channel diversity by embedding these signatures into the signals transmitted between UEs and base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-orthogonal multiple access (NoMA) technologies are used to share physical resources efficiently, then resource utilization improves, but inter-beam and intra-beam interference increases
Solution Approach 1:
The patent segments the signature assignment into two independent levels: group-based signatures (assigned to groups of UEs sharing the same beam) and device-based signatures (assigned to individual UEs). This segmentation allows separate optimization of interference mitigation at group level and user level, resolving the contradiction by enabling NoMA resource sharing while controlling interference through hierarchical signature management.
Solution Approach 2:
The patent applies different signature characteristics to different spatial groups (beams). Each beam group can be configured with signatures optimized for its specific interference environment, while individual UEs within groups use device-specific signatures. This local quality approach allows the system to maintain high resource utilization in each beam while mitigating both inter-beam and intra-beam interference through tailored signature assignments.
2Measurement precision
If device-based signatures are used for signal differentiation, then user-specific signal identification improves, but intra-beam multi-user interference increases
Solution Approach 1:
The group-based signature acts as an intermediary layer between the device-based signature and the physical channel. By first applying group-based signatures to differentiate between beam groups, then applying device-based signatures within each group, the system reduces intra-beam interference by ensuring that device-specific signatures only need to differentiate users within the same beam group, rather than across all beams.
3Object-generated harmful factors
If group-based signatures are assigned to UE groups, then inter-beam interference mitigation improves, but device complexity increases
Solution Approach 1:
The patent segments the signature management function into network-side operations (group formation, group-based signature assignment) and device-side operations (device-based signature assignment, signal generation). This segmentation reduces device complexity by offloading the complex group management tasks to the network, while devices only need to implement relatively simple device-based signature assignments and signal processing.
4Object-generated harmful factors
If multiple signature pools are used for different beam groups, then interference mitigation effectiveness improves, but system complexity increases
Solution Approach 1:
The patent designs the signature pools to be universal across different beam groups, where each pool contains signatures that can be applied to any group. The system selects appropriate signatures from these universal pools based on the specific interference conditions of each beam group, rather than maintaining separate dedicated pools for each group. This universality reduces system configuration complexity while maintaining interference mitigation effectiveness.
Data Source
AI summary
In a wireless communications having a base station in communication with a plurality of user equipments (UEs), the UEs are classified into a plurality of UE groups based on the communication conditions thereof. Each UE is assigned with a device-based signature for the UE and a group-based signature for a group having the UE as a member thereof. Then, a wireless signal is generated based on the first and second signatures and transmitted between the base station and the UE.