Frequency Range Allocation for Mobile Radio Uplink Downlink
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Solution Overview
Problem
Conventional mobile radio networks face inefficiencies due to the need for separate frequency or time ranges for uplink and downlink transmissions, leading to poor spectral efficiency and limited capacity, despite attempts to reduce interference through frequency reuse factors like 3 and 7.
Innovation Solution
The solution involves using identical frequency ranges for both uplink and downlink transmissions between mobile radio terminals and neighboring base stations, doubling the reuse of frequency ranges and employing filters to manage increased interference, thereby enhancing spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate frequency ranges are used for uplink and downlink transmissions, then interference between directions is reduced, but spectral efficiency deteriorates and network capacity is limited
Solution Approach 1:
The patent merges the frequency ranges used for uplink and downlink transmissions by allowing identical frequency ranges to be reused in opposite transmission directions. Specifically, frequency ranges used for downlink transmission in one radio cell are assigned for uplink transmission in neighboring radio cells, and vice versa. This combining approach eliminates the need for separate frequency allocation for each direction, thereby doubling spectral efficiency while maintaining interference reduction through spatial separation.
2Reliability
If frequency reuse factor of 3 or 7 is used to reduce interference, then interference between radio cells is reduced, but the number of frequency ranges required increases
Solution Approach 1:
The patent inverts the conventional frequency allocation approach by allowing the same frequency ranges to be used in opposite transmission directions (uplink vs downlink) in neighboring radio cells. Instead of allocating different frequency ranges for uplink and downlink, the system reuses identical frequency ranges bidirectionally, thereby reducing the total number of frequency ranges needed from 6 (with reuse factor 3) or 14 (with reuse factor 7) down to just 3 or 7 frequency ranges respectively, while maintaining interference reduction.
3Productivity
If identical frequency ranges are reused in neighboring radio cells for opposite transmission directions, then spectral efficiency doubles, but interference management becomes more challenging
Solution Approach 1:
The patent applies local quality by implementing direction-specific frequency allocation where each radio cell has differentiated frequency range assignments based on transmission direction. Specifically, downlink frequency ranges in one cell are assigned for uplink in neighboring cells, creating a localized frequency structure that exploits spatial and directional separation. This local differentiation enables efficient interference management while achieving doubled spectral efficiency through systematic frequency reuse patterns.
Data Source
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AI summary
The invention relates to methods for a mobile radio network (10) and to a mobile radio network (10). The mobile radio network comprises at least two base stations (14) which each have at least one antenna for receiving and/or sending uplink and/or downlink transmissions (26, 28), the coverage area of a base station (14) forming at least one radio cell (16). The radio cell (16) has separate frequency and/or time ranges for the uplink transmission (26) and the downlink transmission (28). For the respective downlink transmission (28) between the mobile radio terminal (20, 22, 24) and the base station (14), identical frequency ranges are allocated to the uplink transmission (26) of an adjacent radio cell (16), or vice versa.