Dynamic Frequency Block Allocation for LTE and P25 Bearer Interference
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Solution Overview
Problem
Existing multi-bearer radio systems face challenges in efficiently utilizing available frequency spectrum when combining wideband LTE with narrowband bearers like P25, leading to interference and limited resource allocation for critical communications.
Innovation Solution
A method that allocates frequency blocks for both LTE and P25 bearers, allowing for efficient spectrum use by grouping and separating blocks, prioritizing critical communications, and dynamically reallocating resources to minimize interference, using a controller to manage the allocation and selection of bearers for transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency spectrum is allocated for wideband LTE bearer, then broadband data connectivity is improved, but narrowband P25 bearer resources are reduced
Solution Approach 1:
The available frequency spectrum is segmented into multiple frequency blocks that can be dynamically allocated to different bearers. The system divides the spectrum into discrete units (frequency blocks) that can be assigned to LTE or P25 bearers based on demand, allowing flexible resource management without permanent allocation to either bearer type.
Solution Approach 2:
The frequency block allocation is dynamic rather than static. The system continuously monitors bearer usage and reallocates frequency blocks between LTE and P25 bearers based on current traffic demands. When LTE traffic decreases, frequency blocks are released for P25 use, and vice versa, enabling adaptive spectrum utilization.
2Productivity
If frequency blocks are allocated for both LTE and P25 bearers, then spectrum utilization is improved, but interference between bearers increases
Solution Approach 1:
The system segments the frequency spectrum into distinct frequency blocks that are separately allocated to different bearers. By assigning specific frequency blocks to LTE and other blocks to P25, the system spatially separates the bearers in the frequency domain, reducing mutual interference while maintaining high spectrum utilization through efficient block assignment.
Solution Approach 2:
Different frequency blocks are allocated with different quality characteristics suitable for their intended bearer type. The system assigns frequency blocks based on their spectral properties and the specific requirements of each bearer, optimizing local frequency resource allocation to minimize interference while maximizing overall system performance.
3Reliability
If critical P25 communications are prioritized, then reliability of critical communications is improved, but LTE data transmission efficiency is reduced
Solution Approach 1:
The system dynamically adjusts frequency block allocation between LTE and P25 bearers based on real-time traffic conditions and priority requirements. When critical P25 communications are detected, the system reallocates frequency blocks to prioritize P25, ensuring reliable critical communications. When P25 traffic decreases, frequency blocks are released for LTE data transmission, maintaining LTE efficiency through adaptive resource management.
Solution Approach 2:
The system implements feedback mechanisms to monitor bearer usage and traffic conditions continuously. Based on this feedback, the controller makes real-time decisions about frequency block allocation, adjusting resources to prioritize critical P25 communications when needed while maximizing LTE data transmission efficiency during normal operations.
Data Source
AI summary
A communication system having multiple bearers overlays a relatively narrowband bearer such as P25 on a relatively wideband bearer such as LTE, for transmission of both uplink and downlink signals. The wideband bearer uses a spectrum of subcarriers which form a set of radio frequency blocks. One or more blocks or other related parts of the spectrum may be allocated to the narrowband bearer. In some cases the narrowband bearer may push through the wideband allocation using a relatively high power to dominate signals transmitted by the wideband bearer. Voice calls such as emergency calls using the narrowband bearer may be prioritized.