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Probability calculation of rat candidate

A probability estimation, probability technology, applied in the field of improving the selection of wireless access technology, can solve problems such as difficulty in determining the correct communication mode of the operation mode

Inactive Publication Date: 2014-03-19
ST ERICSSON SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] When different modes of operation have power spectral density signatures similar to each other, it may still be difficult to determine which mode of operation is the correct mode of communication since more than one mode of operation seems to be possible

Method used

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  • Probability calculation of rat candidate
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  • Probability calculation of rat candidate

Examples

Experimental program
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Effect test

example 1

[0103] Example 1 – Difference between WCDMA and LTE5MHz

[0104] Figure 8Two frequency plots are shown. The graph above shows the energy of a radio signal 800 received at frequencies between 21 MHz and 36 MHz (at Figure 8 , the x-axis is represented at a distance of 15kHz). The lower graph shows the probabilities 840a-840b for the two candidate signals found in the upper graph. Figure 8 The above picture is with Figure 7 same graph. Figure 8 Shown is a situation where there are two cells; 1WCDMA (2114.6MHz) and 1LTE5MHz (2122.8MHz). Two candidates or cells have been identified as possible WCDMA and marked with asterisks 810a-b. Assuming that the RATs of the two candidates are WCDMA, a transmission band 820a and a transmission band 820b as well as a guard band 830a and a guard band 830b (marked with dotted lines) are determined. The probabilities 840a and 840b for the two candidates 840a and 840b are calculated and plotted in the figure below. Computing the proba...

example 2

[0105] Example 2 - GSM cell with low power compared to GSM detection of high power errors

[0106] Figure 9 Two frequency plots are shown. The upper graph shows the energy of a radio signal 900 received at frequencies between 0 MHz and 52.5 MHz. The lower graph shows the probabilities for the candidate signals identified in the upper graph. Figure 9 Shows the situation where there are three cells; 1GSM (in Figure 9 The carrier frequency in 2107MHz), 1WCDMA (in Figure 9 The carrier frequency in 2114.6MHz) and 1LTE5MHz (in Figure 9 The carrier frequency in 2122.8MHz). In this example 9, candidate 910 is identified as GSM (asterisk). The probabilities 940 for each candidate are plotted in the lower graph. For the leftmost candidate, calculation of the GSM probability will give P 1 = 0.65, and, for the rest of the detected candidates, is a probability between approximately 0 and 0.25, thus, also clearly seen from the figure below, the true GSM is classified as the m...

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Abstract

An apparatus (200) for use in a telecommunications system. The apparatus (200) comprising a memory (240) and a controller (210). The controller (210) is configured to receive a radio frequency bandwidth and identify a first candidate carrier frequency (710) from the received a radio frequency bandwidth. The controller is further configured to, for a first potential radio access technology determine a probability estimate (Prob) for the first candidate carrier frequency (710) being a carrier frequency of the first potential radio access technology, where in the probability estimate is based on a received power in a transmission band of the first potential radio access technology having the candidate carrier frequency (710) and on a received power in a guard band of the first potential radio access technology having the candidate carrier frequency and from this select a radio access technology based on the probability estimate (Prob) for the candidate carrier frequency (710).

Description

technical field [0001] The present invention relates to methods, devices and computer program products for improving selection of radio access technologies, and more particularly to methods, devices and computer program products for improving selection of radio access technologies by spectrum-based probability calculations. Background technique [0002] Mobile communications (eg, mobile telephony) is a technology that continues to gain an increasing user base. Similarly, when new technologies emerge, they will co-exist with older standards. Furthermore, different geographic regions have different communication standards and spectrum plans. When a user equipment (UE) (eg, a mobile phone) is switched on, the user equipment searches for available network operators based on a stored radio access technology (RAT) and a history list of operators. List information is available about which RAT is available and what carrier frequency it is, which makes it easy for the UE to quickly...

Claims

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Application Information

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IPC IPC(8): H04W48/18H04W88/06
CPCH04W48/18H04W88/06
Inventor 比约恩·恩斯特龙
Owner ST ERICSSON SA
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