FR3081664A1 - A METHOD OF CREATING LSRA INFORMATION (LSA SPECTRUM RESOURCE AVAILABILITY INFORMATION) - Google Patents

Abstract

The present invention claims to go beyond the state of the art of LSA by describing not only a method of creating LSRAI information (LSA Spectrum Resource Availability Information) according to the use of the spectrum requested by a priority user ( called primary user) to the detriment of the current user (called secondary user); but, this method also allows the automation of the preemption process from end to end and in real time to allow a preemption of dynamic spectrum and without latency by a primary user.

Description

A method for creating LSA Spectrum Resource Availability Information (LSRAI) DESCRIPTION OF THE INVENTION

Description of the figures

Figure 1 shows an example of state-of-the-art LSA architecture.

Figure 2 shows an example of spectrum preemption according to the state of the art of the LSA.

FIG. 3 describes an example of a sequence of messages making it possible to perform spectrum preemption in accordance with the state of the art of the LSA illustrated by FIGS. 1 and 2.

Figure 4 shows an example of an LSA architecture to which is added a primary user deploying a tactical cellular telecommunications network.

FIG. 5 represents an example of a sequence of messages making it possible to perform spectrum preemption from end to end and in accordance with the invention illustrated by FIG. 4.

Description of the state of the art of a radio environment map (REM)

A radio environment map or REM (Radio Environment Map), representing a dynamic, multi-dimensional, real-time radio environment, can be used to help the decision-making process in many telecommunications applications such as as the configuration, optimization, repair of radio networks, dynamic radio planning, or even the sharing of radio spectrum for civil, security and defense telecommunications.

The radio environment map or REM can be designed as a database containing information on the radio environment, par. eg, the power received from a radio frequency (RF) signal, the weakening of a radio frequency (RF) signal related to its propagation in the surrounding physical environment, or a level of radio frequency (RF) interference ) aggregated and represented in spatial, temporal and frequency dimensions.

The information that will make up the radio environment map is calculated for the spatial, temporal and frequency dimensions using advanced RF propagation models. These complex RF propagation models take into account a multitude of physical phenomena linked to the propagation of RF signals (see FR3020530).

The radio environment map or REM is constructed using information on the deployment topology of radio transmitters and receivers, using their technical characteristics and RF configurations, using data on the surrounding environment such as digital terrain models, land cover models or above-ground dimensions, digital building models, static models of climate, soil refractivity, air permittivity, and general, of any data that interferes with the propagation of RF signals (see FR3020529).

In addition, the radio or REM environment map is enriched with punctual RF measurements measured in the field; these real measurements can be used to calibrate the RF propagation models, continuously and in real time (see FR3039961).

The radio or REM environment map can be viewed, for example, using a GIS (Geographic Information System) interface, to show information in spatial, temporal and frequency dimensions.

The concept of the radio environment map or REM has been the subject for many years of mainly academic work with no industrialization objective.

However to be usable in an industrial field, such as the field of civil telecommunications, security and defense, the radio environment map or REM needs to obtain reliable results.

Page 2 representing a radio environment close to reality.

Description of the state of the art of Licensed Shared Access (LSA)

In order to maximize the use of the spectrum, new models allowing the spectrum to be shared between different users have been defined.

For example, the LSA makes it possible to share the spectrum between primary and secondary users.

Primary users have access to priority spectrum over secondary users.

When primary users use spectrum in a given geographical area, the transmitters of secondary users, (for example radio base stations, in the case of a mobile operator) likely to interfere in this geographical area are reconfigured so as to do not generate interference on primary users.

Alternatively and when the primary user uses the same radio technology as the secondary user, it may be advantageous to reuse the secondary user network for the benefit of the primary user

Figure 1 shows an example of state-of-the-art LSA architecture.

In this figure, a primary user is connected to an LR ("LSA Repository").

The LR is connected to LCs ("LSA Controller"). Each LC is responsible for processing preemption requests from the LR and identifying the network elements to be reconfigured so as not to generate interference on the primary user; this LC task can also be partially performed by the NM ("Network Manager"), depending on the functional breakdown chosen by the operator.

The NM, radio base stations (eg eNodeBs or "eNBs"), are the elements of the secondary user network. This network can for example be a 3GPP LTE network.

The NM is the entity used to reconfigure radio base stations.

For more information on the LSA see the following ETSI standards:

- ETSI TS 103 154 “System requirements for operation of Mobile Broadband Systems in the 2300 MHz -2400 MHz band under LSA”, TS 103 235 “System Architecture and High-Level Procedures for operation of LSA in the 2300 MHz-2400 MHz band” ,

- ETSI TS 103 235 “System Architecture and High-Level Procedures for operation of LSA in the 2300 MHz-2400 MHz band”,

ETSI TS 103 379 VI. 1.1 “Information elements and protocols for the interface between LSA Controller (LC) and LSA Repository (LR) for operation of Licensed Shared Access (LSA) in the 2300 MHz-2400 MHz band”,

ETSI TS 128 301 V14.0.0 “LTE; Telecommunication management; Licensed Shared Access (LSA) Controller (LC) Integration Reference Point (IRP); Requirements (3GPP TS 28.301 version 14.0.0 Release 14) ”,

ETSI TS 128 302 V14.0.0 “TE; Telecommunication management; Licensed Shared Access (LSA) Controller (LC) Integration Reference Point (IRP); Information Service (IS) (3GPP TS 28.302 version 14.0.0 Release 14) ”,

ETSI TS 128 303 V14.0.0 “LTE; Telecommunication management; Licensed Shared Access (LSA) Controller (LC) Integration Reference Point (IRP); Solution Set (SS) definitions (3GPP TS 28.303 version 14.0.0 Release 14) ”.

Page 3

Figure 2 shows an example of spectrum preemption according to the state of the art of the LSA.

The left side of Figure 2 shows the network status of a secondary user when there is no spectrum preemption.

The circles around the radio base stations indicate their respective radio coverage.

In this figure, a radio base station is colored white if it is used by the secondary user's network. A radio base station is colored gray if it is switched off.

The dotted rectangle indicates a pre-emption geographic area, over which the primary user wishes to have access to the spectrum.

On the left side of Figure 2, the preemption request has not yet been processed. As a result, all radio base stations can be used by the secondary user network.

The right side of Figure 2 shows the network status after the preemption request has been processed.

The radio base stations 1, 2, and 3 are switched off so as not to generate interference on the pre-emption geographical area illustrated in dotted lines.

Radio base stations 4 and 5 are still authorized to transmit, but their transmission power has been reduced in order not to generate interference in the geographic area of preemption.

FIG. 3 describes an example of a sequence of messages making it possible to carry out the network reconfiguration illustrated by FIGS. 1 and 2, in an LSA architecture.

A primary user sends a spectrum preemption request to the LR. The LR spectrum preemption request details spectrum preemption with information such as geographic area, maximum interference level tolerated by the primary user.

The LR sends LSA Spectrum Resource Availability Information (LSRAI) to LC describing information about resources that can either be used by the secondary user or restricted for secondary use. The message transmitted by the LR to the LC can for example correspond to the “LSRAI Notification” message as defined in the document ETSI TS 103 379.

The secondary user, the LC in the case of the LSA, identifies the new parameters of the secondary user network based on the new LSRAI information received.

The parameters of the secondary user network which can be modified by the LC or via the NM may consist, for example, for a given radio base station of the network, by:

A modification of the transmission power,

A modification of the antenna parameters,

A modification of the access priority parameters,

A modification of the neighbor cell list (or “neighbor cell list”),

A modification of the "hand over" parameters,

A change in the identifier of a cell associated with this radio base station.

The identification by the secondary user, the LC in the case of the LSA, of these new parameters of the network of the secondary user may have in particular the objective:

Page 4 to modify the radio coverage of a radio base station so that it covers all or part of the pre-emption geographic area, and thus be able to serve the users of the primary user's network, when that station radio base is located in or near the pre-emption geographic area.

- to modify the coverage of a radio base station in order to limit the interference of this radio base station on the geographic preemption area, when this radio base station is identified as being too far from the geographic preemption area to be able to be useful to the primary user.

to modify the access of the terminals to the cells of a radio base station in order to favor the users of the primary user, when this radio base station is located in or near the preemption zone.

In step 3, the secondary user, the LC in the case of the LSA, transmits these new parameters to the NM. When the NM is as defined in a 3GPP architecture, these parameters of the secondary user network can be supplied to the NM through the message "cellsConstraintsUpdate" as defined in the document ETSI TS 128.302.

The NM then reconfigures the radio base stations of the secondary user network according to these parameters.

Once the reconfiguration of the secondary user network has been carried out, a confirmation is transmitted to the primary user, via the LC and the LR (steps 4 to 6).

The primary user can then connect to the radio base stations that cover the preemption area, without receiving interference from the secondary user.

In an alternative to step 3 of the diagram illustrated in FIG. 3, the spectrum preemption request is transmitted from LC to NM through the message "notifyZoneCreation" or the message "notifyZoneModifîcation" as defined in the document ETSI TS 128.302. In this alternative, the new parameters of the secondary user network are identified by the NM.

However, the state of the art of LSA including the ETSI standards cited above does not describe a method of creating LSRAI (LSA Spectrum Resource Availability Information) information.

Description of the invention

The present invention goes beyond the state of the art of LSA by describing not only a method of creating LSRAI information (LSA Spectrum Resource Availability Information) according to the use of the spectrum requested by a priority user (called primary user) to the detriment of the current user (called secondary user); however, this method also allows end-to-end, real-time automation of the preemption process to allow dynamic and latency-free spectrum preemption by a primary user.

This method is characterized by the following operations:

1. acquisition, preferably automatic, of the actual deployment data of the radio network of the primary user consisting of information from the radio base stations (for example eNBs in the case of a 3GPP / LTE network) as follows:

at. the transmission powers, and

b. the parameters of the following antenna elements: latitude, longitude, antenna height, azimuth, "downtilt", horizontal and vertical radiation patterns, if applicable "beamforming" parameters, and

vs. Access priority parameters for cells associated with radio base stations such as ARP

Page 5 or "Allocation and Retention Priority", ACB or "Access Class Barring", and

d. lists of neighboring cells or "neighbor cell list", and

e. the “hand over” parameters of the cells associated with the radio base stations, and

f. the identifiers of the radio base stations and of the associated cells.

2. from the actual data collected in the previous step, an outline of the radio coverage to be protected (or protection zone) of said network is determined as follows:

at. for each radio base station, 360 radials separated by a degree are defined where each radial corresponds to the line which extends up to 40 km from the location of the base station, and

b. along each radial, the strength of the radio signal received from the radio base station is calculated at points regularly spaced 30 meters apart using RF propagation models, and

vs. along each radial, a vertex is defined at the distance which corresponds to the power of the received radio signal greater than or equal to -106 dBm / MHz, and

d. a first contour is defined by connecting the 360 vertices, and

e. the contour is smoothed using a “Hamming” filter of order 15, and

f. once the contours have been calculated for each radio base station, the union of all contours is achieved; this union corresponds to the outline of the radio coverage to be protected; the union result can be disjoint contours when the individual boundaries per radio base station do not overlap.

3. the radio coverage to be protected is then validated according to the prerogatives of the primary user to be able to pre-empt access to the spectrum on said coverage area recorded in the LR, and

4. the radio covers to be protected are finally formatted in the form of standardized information elements of the LSRAI object (LSA Spectrum Resource Availability Information) as defined by the ETSITS standard 103 379 and then sent via the LSA-1 interface at LC;

The radio coverage to be protected from said network is calculated using RF propagation models, digital terrain models, land cover or above-ground congestion models, digital building models, static climate models, ground refractivity, air permittivity, and in general, any data that interferes with the propagation of RF signals.

The radio coverage to be protected from said network will be protected from co-channel radio transmissions from the secondary user's radio base stations located within 40 km of a particular point in the protection zone, including full protection against interference at this point. point is equal to or greater than the protection level of -90 dBm / MHz.

The standardized information elements of the LSA Spectrum Resource Availability Information (LSRAI) object relevant to the method are defined as follows:

the object contains one or more geographic zones corresponding to the radio coverage to be protected calculated by the above method, each zone of the object is of "protection" type, each zone contains:

o a contour in the form of a polygon, and o the frequencies used by the primary user in said area, and o the level of protection of said area and set at -90 dBm / MHz, and o the interval (s) of time during which said area must be protected.

Figures 4 and 5 illustrate the method of the present invention.

Figure 4 shows the example of an LSA architecture corresponding to the state of the art to which has been added, as

Page 6 primary user, a cellular and tactical radio communications network.

It should be noted that the REMs of FIG. 4 represent a choice of deployment where the REM function for calculating the radio coverage of the cellular network newly deployed by the primary user and to protect and the REM function for validating the radio coverage to protect according to the prerogatives of the primary user to preempt access to the spectrum on said coverage area are hosted respectively in the network of the primary user and in the LR.

Another deployment choice not shown in FIG. 4 is to group together the REM function for calculating the radio coverage of the cellular network newly deployed by the primary user and to be protected and the REM function for validating the radio coverage to be protected as a function prerogatives of the primary user to pre-empt access to the spectrum on said coverage area in the LR.

Another deployment choice not shown in FIG. 4 is to have as many REM functions for calculating the radio coverage to be protected as there are radio base stations and to host this function directly on each radio base station; in this case, the REM function for validating the radio coverage to be protected and hosted in the LR will have the task of achieving the union of the individual radio covers to form the radio coverage to be protected corresponding to the entire network deployed.

Page 7

A method for creating LSA Spectrum Resource Availability Information (LSRAI)

Claims (4)

CLAIMS (CLAIM 1) A method of creating LSA Spectrum Resource Availability Information (LSRAI) characterized by the following operations: 1. acquisition of the actual deployment data of the primary user's radio network consisting of information from the following radio base stations: at. the transmission powers, and b. the parameters of the following antenna elements: latitude, longitude, antenna height, azimuth, "downtilt", horizontal and vertical radiation patterns, if applicable "beamforming" parameters, and vs. The access priority parameters of the cells associated with the radio base stations, and d. lists of neighboring cells, and e. the “hand over” parameters of the cells associated with the radio base stations, and f. the identifiers of the radio base stations and of the associated cells. 2. from the actual data collected in the previous step, an outline of the radio coverage to be protected (or protection zone) of said network is determined as follows: at. for each radio base station, 360 radials separated by a degree are defined where each radial corresponds to the line which extends up to 40 km from the location of the base station, and b. along each radial, the strength of the radio signal received from the radio base station is calculated at points regularly spaced 30 meters apart using RF propagation models, and vs. along each radial, a vertex is defined at the distance which corresponds to the power of the received radio signal greater than or equal to -106 dBm / MHz, and d. a first contour is defined by connecting the 360 vertices, and e. the contour is smoothed using a “Hamming” filter of order 15, and f. once the contours have been calculated for each radio base station, the union of all contours is achieved; this union corresponds to the outline of the radio coverage to be protected; the union result can be disjoint contours when the individual boundaries per radio base station do not overlap. 3. the radio coverage to be protected is then validated according to the prerogatives of the primary user to be able to pre-empt access to the spectrum on said coverage area recorded in the LR, and 4. the radio covers to be protected are finally formatted in the form of standardized information elements of the LSRAI object (LSA Spectrum Resource Availability Information) as defined by the ETSI standard TS 103 379 and then sent via the LSA interface 1 at LC; (CLAIM 2) The method according to claim 1, in which said radio coverage to be protected from said network is calculated using RF propagation models, digital terrain models, land use or footprint models, digital radio models. built, static models of climate, ground refractivity, air permittivity, and in general, any data that interferes with the propagation of RF signals. (CLAIM 3) The method according to claim 1 wherein said radio coverage to be protected from said network will be protected from co-channel radio transmissions from the radio base stations of the secondary user located within 40 km Page 8 of a particular point in the protection zone for which the total protection against interference at that point is equal to or greater than the protection level of -90 dBm / MHz. (CLAIM 4) The method according to claim 1 wherein said standardized information elements of the LSA Spectrum Resource Availability Information (LSRAI) object are defined as follows: the object contains one or more geographic zones corresponding to the radio coverage to be protected, each zone of the object is of "protection" type, each zone contains: o o o o an outline in the form of a polygon, and the frequencies used by the primary user over said area, and the level of protection of said area and set at -90 dBm / MHz, and the time interval or intervals during which said area must be protected. (CLAIM 5) The method according to claim 1 in which said steps 1,2 are performed by an REM hosted in the network of the primary user and said steps 3 and 4 are carried out by an REM hosted in the LR, or alternatively said steps 1,2a to 2e are carried out by a REM hosted in each radio base station of the network of the primary user and said steps 2f, 3 and 4 are carried out by a REM hosted in the LR, or alternatively said steps 1, 2, 3 and 4 are carried out by a REM hosted in the LR