Priority-Based Resource Allocation for Inter-Cell Interference Mitigation
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Solution Overview
Problem
In wireless communication systems, inter-cell interference occurs due to different traffic types having varying priorities, leading to undesirable performance in cells sharing the same band or sub-band, particularly affecting mission-critical communication which requires high reliability and low latency.
Innovation Solution
The system determines traffic priorities and assigns specific resource sets to each type of traffic, using a priority-based resource allocation scheme that divides the frequency band into sub-bands to mitigate interference, ensuring that high-priority traffic, such as mission-critical communication, is prioritized over lower-priority traffic, and coordinates resource allocation between adjacent cells to prevent overlap and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resources are shared between adjacent cells to improve spectral efficiency, then system capacity increases, but inter-cell interference increases causing performance degradation
Solution Approach 1:
The frequency spectrum is segmented into multiple sub-bands, and each sub-band is further divided into resource blocks. Different priority traffic types are allocated to different sub-bands or resource blocks, allowing simultaneous transmission while reducing inter-cell interference through frequency domain separation.
Solution Approach 2:
Different quality of service levels are applied locally to different traffic types within the same cell. High-priority traffic (e.g., mission-critical communications) receives preferential resource allocation and protection from interference, while low-priority traffic accepts lower quality levels, enabling differentiated service quality across the network.
2Object-affected harmful factors
If transmit power is reduced to yield to adjacent cell users, then inter-cell interference is reduced, but signal quality and data rate deteriorate
Solution Approach 1:
The solution moves from power control in the time domain to resource allocation in the frequency domain. By assigning different frequency resources to different priority traffic and coordinating between adjacent cells, the system achieves interference mitigation without requiring transmit power reduction, thereby maintaining signal quality.
3Reliability
If priority-based resource allocation is implemented to protect mission-critical traffic, then reliability of high-priority traffic improves, but system complexity increases
Solution Approach 1:
The resource allocation process is segmented into hierarchical levels: first dividing spectrum into sub-bands, then into resource blocks, and finally allocating specific resource blocks to different priority traffic types. This structured segmentation simplifies the allocation logic compared to exhaustive optimization methods.
Solution Approach 2:
The system changes the parameter of resource allocation from equal treatment to priority-based differential allocation. By introducing priority levels as a new parameter, the system can automatically differentiate resource distribution without requiring complex real-time negotiation between cells.
4Object-affected harmful factors
If frequency band is divided into sub-bands for priority traffic separation, then inter-cell interference is mitigated, but spectral efficiency decreases
Solution Approach 1:
Instead of completely isolating different priority traffic in separate frequency bands, the system applies partial separation by allocating specific resource blocks within sub-bands. This partial action approach maintains sufficient frequency diversity to reduce interference while utilizing most of the available spectrum, avoiding the excessive action of complete band separation that would waste spectral resources.
Data Source
AI summary
Traffic in a first cell may experience interference from or may cause interference to traffic in an adjacent cell, which may lead to undesirable performance in one or both of the first cell and the adjacent cell. For example, a user equipment (UE) near an edge of the first cell may experience appreciable interference based on the reuse of resources. Accordingly, for transmissions in adjacent cells over a same band or sub-band, one UE may need to reduce transmit power in order to yield to another UE in an adjacent cells. An apparatus may be configured to determine first traffic associated with a first priority and second traffic associated with a second priority. The apparatus may be further configured to assign, based on the first priority and second priority, a first set of resources to the first traffic and a second set of resources to the second traffic.