Nonstandard Bandwidth Central Frequency Shift for Asymmetric PRB Blocking
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Solution Overview
Problem
Network operators face challenges in implementing nonstandard bandwidths in LTE carrier configurations, as existing solutions often result in reduced spectral efficiency due to symmetrical blocking of physical resource blocks (PRBs), particularly when an odd number of PRBs needs to be blocked, leading to wasted resources.
Innovation Solution
A method and apparatus that determine a central frequency shift for nonstandard bandwidths relative to standard bandwidths by calculating the difference in available PRBs and adjusting the central frequency to allow for asymmetric blocking of PRBs, thereby optimizing spectral efficiency by enabling the selection of any number of PRBs, including odd numbers, to be blocked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If symmetrical blocking of PRBs is used to implement nonstandard bandwidth, then the implementation is simple and standardized, but spectral efficiency is reduced due to wasted resources when odd number of PRBs need to be blocked
Solution Approach 1:
The patent introduces an asymmetric frequency shift parameter (deltaF) that shifts the center frequency of the nonstandard bandwidth relative to the standard bandwidth. This asymmetry allows the blocking of PRBs to be unevenly distributed around the center frequency, enabling optimal spectral utilization when an odd number of PRBs need to be blocked, thereby resolving the contradiction between implementation simplicity and spectral efficiency.
2Adaptability or versatility
If standard carrier bandwidth is chosen narrower to fit nonstandard spectrum, then spectrum fitting is achieved, but resource utilization is wasted
Solution Approach 1:
The patent changes the frequency parameter by introducing a configurable frequency shift (deltaF) that allows the system to adapt to nonstandard bandwidths while maintaining optimal PRB utilization. This parameter change enables the system to fit nonstandard spectra without wasting resources by allowing asymmetric PRB blocking patterns that fully utilize the available spectrum.
3Loss of energy
If central frequency is shifted asymmetrically for nonstandard bandwidth, then spectral efficiency is improved by enabling optimal PRB blocking, but calculation complexity increases
Solution Approach 1:
The patent performs preliminary calculation of the frequency shift parameter (deltaF) based on the relationship between standard and nonstandard bandwidths. By pre-calculating this shift parameter, the system establishes a clear reference point for PRB blocking decisions, which simplifies the overall calculation process despite the asymmetric nature of the solution, thus resolving the contradiction between spectral efficiency improvement and calculation complexity.
Data Source
AI summary
Method and apparatus are disclosed for implementing a nonstandard bandwidth at a network device. According to an embodiment, a first amount of physical resource blocks (PRBs) available in the nonstandard bandwidth is determined. A second amount of PRBs available in a standard bandwidth corresponding to the nonstandard bandwidth is determined. A central frequency shift of the nonstandard bandwidth relative to the standard bandwidth is determined based at least on the first amount of PRBs and second amount of PRBs. A network device comprising the apparatus is also disclosed.