retour en haut
  • Accueil
  • Publications
  • Thematic files
  • Licensed Shared Access (LSA)

Licensed Shared Access (LSA)



Towards more dynamic spectrum sharing: /Licensed Shared Access




France wishes to keep an option that leaves space for high speed security network communications (“PPDR”), because the band seems specially suitable for personal portable devices.  Several possibilities are under study, of which some could be combined with the use of additional frequency blocks to provide downwards capacity to commercial networks (SDL technology, “supplemental downward link”). The other options under study at the European level are wireless microphones that currently use blank television space in the 470-790 MHz band and the commercial networks for M2M applications.   

Border coordination

In France, the perspective of the assignment of the band to mobile operators starting from 2015 brought the Agency, supported by the countries with the same ambitions such as Germany, to launch thought processes aiming to revise the border agreements with neighbouring countries in order to be able to transfer television below 694 MHz in the calendars being considered.  

When the 800 MHz band was reassigned, these negotiations took over three years. If the geography of our borders with Italy and Spain make coordination easier, the situation is much more complicated in northern France considering the number of countries involved (Belgium, Luxembourg, Netherlands, Germany, United Kingdom) and a more unfavourable topography encouraging long distance radio routes. 

The informal WEDDIP group (Western Europe Digital Dividend Implementation Group) that gathers together these countries now has a key role in preparing the scenarios for the fast migration of television out of the 700 MHz band. An inventory has been made: all the WEDDIP administrations, except for Switzerland, now want to sign most of the required agreements by 2016. 

The next step will be to propose concrete solutions to our neighbours based on the national frequency plan drawn up by the CSA. Transitory plans will probably also be implemented to take into account the calendar to free up the 700 MHz band which will remain specific to each of our neighbours. 

Other possible uses of the 700 band 

At this stage, harmonisation is limited to the 2x30 MHz blocks, leaving 36 MHz of spectrum available for other applications. Currently the CEPT is looking into several options: wireless microphones, security networks (PPDR), additional mobile component (communication to mobile terminals or SDL), machine to machine communications (or M2M) that could be chosen by each country depending on its own needs as part of bespoke “national” harmonisation (figure 1). The work will continue until the summer of 2015. 

700 MHz band channelling and the “national” options being studied

The major increase in mobile traffic is certain: from now until 2030 the most conservative forecasts show traffic multiplied by 30 and the least conservative by 300. Therefore, it is probable that new spectrum needs will appear.

In order to fulfil this demand, the State can, as it has done until now, release new frequency bands and exclusively assign them to very high speed mobile. Considering the increasing cost of this method, it must be combined with new spectrum management modes, in particular the use of dynamic frequency band sharing. 

The possibility of sharing frequency bands already exists: for example, the regulator can issue separate, static licences for separate geographical zones. Open frequencies, such as Wifi, are usually shared by type. However, between these two extremes, dynamic frequency sharing mechanisms can also be designed. This is how the LSA (Licensed Shared Access) appeared. The RSPG defined it in its November 2013 opinion: to facilitate the introduction of radiocommunications systems operated by a limited number of licence holders (“licensees”), the LSA allows them to use a band that has already been assigned “under an exclusive licence scheme” to one or more initial users (“incumbents”). In brief, new users are assigned authorisations on frequencies that remain assigned to someone else, subject to the explicit condition of not creating interference for them: the new arrival must comply with the precise rules that guarantee that the initial occupant’s services are not deteriorated. 

This peaceful coexistence can be adjusted over time. The LSA can, in fact, be implemented dynamically: for example, using a geolocated database, the holders of an LSA authorisation will only use the band in the areas that will not interfere with the initial user. Limitations can also be in time and modulate station power. The originality of the LSA is in the fact that these restrictions must first be accurately defined by the administrations and recorded in written form.  The services previously deployed in the band thus obtain guarantees as to their operational continuity, whereas the new arrivals have sufficient legal security to justify their investments in the band.  

In Europe, the 2.3 GHz band quickly became the main candidate band for LSA experimentation as the RSPG had underlined in its 2013 opinion on wireless high speed. This is a band that had already been identified in 2007 in the radiocommunications regulations for possible use by mobile systems benefiting from standardisation (3GPP). LTE TDD equipment therefore exists for this range of frequencies. It is already used as an exclusive LTE TDD mobile band, in particular in Australia, Hong King, India, Russia, South Africa or China. Since 2013, a CEPT work group (FM52) chaired by the ANFR has been studying the implementation of the LSA in the 2.3 GHz band and an ECC decision in the same vein was adopted in 2014. The ETSI has developed an SRD (System Reference Document) for mobile services using the LSA in the 2.3 GHz band to supplement the CEPT initiatives.. 

In France, this band is currently used by the Ministry of Defence for certain applications, in particular remote aeronautical measurements. The transfer of these applications to another frequency band in the near future cannot be envisaged. The ARCEP also uses the 2,290 2,310 MHz band for video reporting links. These two types of use are specific in that they do not cover the entire territory and are not permanent. Prior studies have been started at the national level under the ANFR’s control to contribute to European work.  

Currently, French businesses such as Alcatel-Lucent alongside start-ups such as Red Technologies are at the cutting edge of LSA. The French public authorities support this innovating regulatory solution which has also been the subject of preparatory European work.  

Sharing this band would make it possible for the Ministry of Defence to carry on using it wherever it is essential to its activities and where it cannot be freed up at a reasonable cost. The LSA approach applied to this band would then provide mobile operators additional capacity for very high speed services on most of the territory. 

The implementation of the LSA system approach will require the regulator to precisely define the conditions for sharing and coordination of the initial and additional uses, by completing the conditions defined in the ECC decision. 

Following the proposals by the ministerial report “A dynamic spectrum management for innovation and growth” by Joêlle Toledano, the work of the Agency’s Electromagnetic compatibility commission (CCE) has made it possible to look deeper into the compatibility between the different envisaged uses for the 2.3 GHz band. At the request of the minister Axel Lemaire, the National frequency agency, in collaboration with the ARCEP, the Business department and the Ministry of Defence, will now indicate the technical conditions that would make it possible to initiate experimentation of the LSA in this band. This initiative will open up the route to a more dense spectrum use while increasing capacity open to mobile high speed.

ANFR a Retweeté

Rassemblés avec les directeurs d’administration et les correspondants #FrenchTech pour faire le point sur l’accompagnement des startups dans leur développement, dont bénéficient celles du #Next40 et bientôt du #FT120. Merci aux agents du @servicepublicfr pour leur travail.

ANFR a Retweeté

🔴 L’@Arcep présente ce matin ses actions, son calendrier et sa vision concernant la #5G auprès des #CollTerr au petit-déjeuner des assises du #THD, organisé par @fil_Aromates à l’@AssembleeNat

Présentation ce matin des multiples bandes de fréquences qui seront progressivement ouvertes à la #5G lors du petit-déjeuner des assises du #THD, organisé par @fil_Aromates à l’@AssembleeNat

L’équipe du service régional @anfr de Lyon en action par tous les temps, pour résoudre les problèmes de #brouillages.

📶Première inauguration ce vendredi de 6 sites multi-opérateurs #4G dans le département de la #Meuse pour étendre l’accès à l'internet mobile.
Le service régional @anfr de Nancy était présent aux côtés des représentants de l’État, des élus et des opérateurs.

L’@anfr a reçu les étudiants du master droit des activités spatiales et des télécommunications pour une journée de cours sur la gestion nationale et internationale des #fréquences. La réglementation des réseaux à satellites est au programme de la semaine prochaine.

#LesEnquêtesANFR 🧐

Savez-vous que les écrans publicitaires peuvent produire des perturbations sur les stations 4G ? Un cas de brouillage s’est présenté dans la ville de Rennes. Découvrez l'intervention de nos agents.


🎁 #JeuConcoursANFR 🎁
Tentez de gagner la version de luxe du jeu des fréquences.
Pour participer :
▶️ RT + Follow @anfr
Et n’hésitez pas à vous inscrire à notre newsletter 🗞️
Tirage au sort le 20 déc.
10 boîtes de jeu à gagner.
Bonne chance 🤞

En novembre, 15 nouvelles stations #5G ont été autorisées par l’@anfr dans le cadre des expérimentations organisées par l’@Arcep : 437 #stations 5G en France sont en test dans la bande 3,5 GHz au 1er décembre.



Le bilan des sites 4G mis en service en métropole au 1er décembre:

▶️ @orange (20 646 sites, + 245 en novembre 2019)
▶️ @SFR (18 218 sites, + 127)
▶️ @bouyguestelecom (17 729 sites, + 45)
▶️ @free (14205 sites, +218).


[#ObservatoireANFR] 📱📊

Au 1er décembre 2019, 49 496 sites #4G sont autorisés par l' @ANFR , en France : découvrez l’étude complète sur l’évolution du déploiement des réseaux #mobiles en métropole et Outre-Mer.

. @michel_sauvade anime un échange sur le bilan 2019 et les perspectives 2020 du Comité national de dialogue et remercie tous les intervenants de leurs contributions qui ont permis des débats riches et constructifs durant cette année.

L’@anfr présente la campagne des mesures en cours sur les sites pilotes #5G dans plusieurs villes en France.

Ce matin, lancement du 5ème Comité national de dialogue à l’@anfr sur l’exposition du public aux #ondes.

Quel est le rôle du département contrôles techniques de l’ @anfr?
Plongez au cœur des fréquences en découvrant le parcours de M. DUMAY chef du contrôles techniques au service régional de Villejuif.


[#newsletter] 🗞️

Découvrez notre dernière lettre d'information!

#Recrutement 🧐

L' @anfr recrute un(e): 👨‍💼👩‍💼

Un(e) Expert (e) en radiocommunications au sein du département Ingénierie du Spectre à Brest.


Nous avons un problème

Une erreur est survenue, merci de contacter un administrateur

Recevez l'actualité de l'anfr

> Modifier votre profil