Soft Time Reuse in Wireless Systems for Interference Management
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Solution Overview
Problem
Current CDMA techniques face challenges in meeting the requirements of wideband wireless communications due to self-interference and limited system capacity and spectrum efficiency, particularly in next-generation mobile communication systems that need to support multiple services with high data transmission rates and quality of service guarantees.
Innovation Solution
Implementing a soft time reuse method in wireless communication systems by selecting non-overlapping primary and secondary time slots with different transmit power thresholds for different areas within a cell or sector, allowing for a time reuse factor of 3 at the border and 1 in the inner zone to reduce inter-cell interference and optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CDMA technique is used to support multiple services, then system capacity and spectrum efficiency are improved, but self-interference increases and orthogonality between spread spectrum codes becomes impossible
Solution Approach 1:
The patent segments the time domain into different time slots with different reuse factors. By dividing time into distinct intervals (first time slot with reuse factor 1, second time slot with reuse factor 3), the system can simultaneously support multiple services while managing self-interference through temporal separation and differentiated resource allocation.
Solution Approach 2:
The patent applies different time reuse factors to different spatial locations within the cell. Users in the first area (closer to base station) use time slot 1 with reuse factor 1, while users in the second area (cell edge) use time slot 2 with reuse factor 3. This local differentiation optimizes performance for specific spatial zones while managing interference locally.
2Object-affected harmful factors
If time reuse factor of 3 is used at cell border, then inter-cell interference is reduced, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies different time reuse factors to different spatial locations within the cell. Users in the first area (closer to base station) use time slot 1 with reuse factor 1, while users in the second area (cell edge) use time slot 2 with reuse factor 3. This local differentiation optimizes performance for specific spatial zones while managing interference locally.
Solution Approach 2:
The patent dynamically assigns different time slots and reuse factors based on user location and service requirements. The system can adaptively switch between reuse factor 1 and 3 depending on whether the user is in the first or second area, optimizing the balance between interference reduction and resource utilization for each user context.
3Speed
If different time slots are allocated to different areas, then communication rate at border is improved, but system complexity increases
Solution Approach 1:
The patent segments the time domain into different time slots with different reuse factors. By dividing time into distinct intervals (first time slot with reuse factor 1, second time slot with reuse factor 3), the system can simultaneously support multiple services while managing self-interference through temporal separation and differentiated resource allocation.
Solution Approach 2:
The patent changes the time reuse factor parameter based on spatial location and service type. By adjusting the reuse factor from 1 to 3 depending on whether users are in the first or second area, the system optimizes communication rates while managing complexity through parameter differentiation rather than structural complexity.
Data Source
AI summary
A method for implementing soft time reuse includes: selecting for a cell or sector at least one time slot as a primary time slot and at least another one time slot as a secondary time slot; using the primary time slot at the border of the cell or sector; setting a first transmit power threshold for the primary time slot; setting a second transmit power threshold for the secondary time slot; the primary time slot selected for the cell or sector and a primary time slot selected for another cell or sector adjacent to the cell or sector are non-overlapped, and the first transmit power threshold is higher than the second transmit power threshold. A system is also provided by the embodiments of the present invention. The system and method reduce the interference between cells or sectors effectively and improve the resource utilization.