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Roaming is a wireless telecommunication term typically used with mobile devices (like mobile phones). It refers to the mobile phone being used outside the range of its home network and connects to another available cell network.

Technical definition

In more technical terms, roaming refers to the ability for a cellular customer to automatically make and receive voice calls, send and receive data, or access other services, including home data services, when travelling outside the geographical coverage area of the home network, by means of using a visited network. For example: should a subscriber travel beyond their cell phone company's transmitter range, their cell phone would automatically hop onto another phone company's service, if available.

The process is supported by the Telecommunication processes of mobility management, authentication, authorization and accounting billing procedures (known as AAA or 'triple A').

Roaming in general

An SMS welcome to Proximus (Belgium) customers who have roamed onto T-Mobile in the UK

Roaming is divided into "SIM-based roaming" and "username/password-based roaming", whereby the technical term "roaming" also encompasses roaming between networks of different network standards, e.g. WLAN (wireless local area network) or GSM. Device equipment and functionality, such as SIM card capability, antenna and network interfaces, and power management, determine the access possibilities.^[1]

Using the example of WLAN/GSM roaming, the following scenarios can be differentiated (cf. GSM Association Permanent Reference Document AA.39):

• SIM-based (roaming): GSM subscriber roams onto a public WLAN operated by:
  
  
  
  • their GSM operator, or
  
  
  • another operator who has a roaming agreement with their GSM operator.
  
  
  
  


• Username/password based roaming: GSM subscriber roams onto a public WLAN operated by:
  
  
  
  • their GSM operator, or
  
  
  • another operator who has a roaming agreement with their GSM operator.
  
  
  
  

Although these user/network scenarios focus on roaming from GSM network operator's networks, clearly roaming can be bi-directional, i.e. from public WLAN operators to GSM networks. Traditional roaming in networks of the same standard, e.g. from a WLAN to a WLAN or a GSM network to a GSM network, has already been described above and is likewise defined by the foreignness of the network based on the type of subscriber entry in the home subscriber register.

In the case of session continuity, seamless access to these services across different access types is provided.

Home and visited networks

"Home network" refers to the network the subscriber is registered with.

"Visitor network" refers to the network a subscriber roams temporarily and is outside the bounds of the "home network".

Roaming agreements

The legal roaming business aspects negotiated between the roaming partners for billing of the services obtained are usually stipulated in so called roaming agreements. The GSM Association broadly outlines the content of such roaming agreements in standardized form for its members. For the legal aspects of authentication, authorization and billing of the visiting subscriber, the roaming agreements typically can comprise minimal safety standards, as e.g. location update procedures or financial security or warranty procedures.

The roaming process

The details of the roaming process differ among types of cellular networks, but in general, the process resembles the following:

Location update

Location updating is the mechanism that is used to determine the location of an MS in the idle state (connected to the network, but with no active call).

1. When the mobile device is turned on or is transferred via a handover to the network, this new "visited" network sees the device, notices that it is not registered with its own system, and attempts to identify its home network. If there is no roaming agreement between the two networks, maintenance of service is impossible, and service is denied by the visited network.


2. The visited network contacts the home network and requests service information (including whether or not the mobile should be allowed to roam) about the roaming device using the IMSI number.


3. If successful, the visited network begins to maintain a temporary subscriber record for the device. Likewise, the home network updates its information to indicate that the cell phone is on the visited network so that any information sent to that device can be correctly routed.

Mobile terminated call

It occurs for example when a call is made to a roaming cell phone.

Signaling process:

1. The calling subscriber (from within the public telephone network) dials the mobile subscriber's MSISDN (the telephone number) of the roaming cell phone.


2. Based on the information contained in the MSISDN (national destination code and the country code), the call is routed to the mobile network gateway MSC (GMSC). It's done with an ISUP IAM message.


3. To locate the MS, the GMSC sends to the HLR a MAP SRI (Send Routing Information) message. The MAP SRI message contains the MSISDN number and with this MSISDN the HLR will obtain the IMSI.


4. Because of past location updates, the HLR already knows the VLR that currently serves the subscriber. The HLR will send to the VLR a MAP PRN (Provide Roaming Number) message to obtain the MSRN of the roaming cell phone. Like that the HLR will be able to route the call to the correct MSC.


5. With the IMSI contained in the MAP PRN message, the VLR assigns a temporary number known as the mobile station roaming number (MSRN) to the roaming cell phone. This MSRN number is sent back to the HLR in a MAP RIA (Routing Information Acknowledgement) message.


6. Now with the MSRN number, the GMSC knows how to route the call to reach the roaming cell phone. Then, the call is made using ISUP (or TUP) signaling between the GMSC and the visited MSC. The GMSC will generate an ISUP IAM message with the MSRN as the called party number (and NOT the MSISDN as the called party number).


7. When the MSC of the visitor network receives the IAM, it recognizes the MSRN and knows the IMSI for which the MSRN was allocated. The MSC then returns the MSRN to the pool for future use on another call. Afterwards, the MSC sends to the VLR a MAP SI (Send Information) message to request information like the called MS's capabilities, services subscribed to, and so on. If the called MS is authorized and capable of taking the call, the VLR sends a MAP CC (Complete Call) message back to the MSC.

In order that a subscriber is able to register on to a visited network, a roaming agreement needs to be in place between the visited network and the home network. This agreement is established after a series of testing processes called IREG (International Roaming Expert Group) and TADIG (Transferred Account Data Interchange Group). While the IREG testing is to test the proper functioning of the established communication links, the TADIG testing is to check the billability of the calls.

The usage by a subscriber in a visited network is captured in a file called the TAP (Transferred Account Procedure) for GSM / CIBER (Cellular Intercarrier Billing Exchange Record) for CDMA, AMPS etc... file and is transferred to the home network. A TAP/CIBER file contains details of the calls made by the subscriber viz. location, calling party, called party, time of call and duration, etc. The TAP/CIBER files are rated as per the tariffs charged by the visited operator. The home operator then bills these calls to its subscribers and may charge a mark-up/tax applicable locally.
As recently many carriers launched own retail rate plans and bundles for Roaming, TAP records are generally used for wholesale Inter-Operators settlements only

Tariffs

Roaming fees are charged on a per-minute basis for wireless voice service, per text message and per megabyte per second^{[citation needed]} for data service, and they are typically determined by the service provider's pricing plan.

Several carriers in both the United States and India have eliminated these fees in their nationwide pricing plans. All of the major carriers^{[citation needed]} now offer pricing plans that allow consumers to purchase nationwide roaming-free minutes. However, carriers define "nationwide" in different ways. For example, some carriers define "nationwide" as anywhere in the U.S., whereas others define it as anywhere within the carrier's network.^[2]

In the UK, the main network providers generally send text alerts to advise users that they will now be charged international rates so it is clear when this will apply. UK data roaming charges abroad vary depending on the nature of the phone agreement (either pay as you go or monthly contracts). Some carriers, including T-Mobile and Virgin Mobile, do not allow pay as you go customers to use international roaming without pre-purchase of an international "add on" or "bolt on."^[3]

An operator intending to provide roaming services to visitors publishes the tariffs that would be charged in their network at least sixty days prior to its implementation under normal situations. The visited operator tariffs may include tax, discounts etc. and would be based on duration in case of voice calls. For data calls, the charging may be based on the data volume sent and received. Some operators also charge a separate fee for call setup i.e. for the establishment of a call. This charge is called a flagfall charge.

Roaming between European countries

In the European Union, the regulation on roaming charges has been in force since 30 June 2007, forcing service providers to lower their roaming fees across the 28-member bloc. It later also included EEA member states. The regulation sets a price cap of €0.39 (€0.49 in 2007, €0.46 in 2008, €0.43 in 2009) per minute for outgoing calls, and €0.15 (€0.24 in 2007, €0.22 in 2008, €0.19 in 2009) per minute for incoming calls - excluding tax.^[4] If the Commission is satisfied that competition will continue to keep prices at this level, or lower, the regulation will expire in mid-2012. Since mid-2009 there is also an €0.11 (excluding tax) maximum price for SMS text message included into this regulation.

On 11 June 2013, the European Commission voted to end mobile roaming charges. It is expected to come into force on 1 July 2014.^[5]

If everything goes according to the plan, as of December 15, 2015, there will be no roaming charges within the European Union. While the European Commission (EC) believes that ending roaming charges will stimulate entrepreneurship and trade, mobile operators have their doubts about the changes.^[6]

Here is a list of operators that started to renounce roaming charges before 15 December 2015:

On 15 June 2017 a bill dubbed "Roam like at Home" signed by the European Parliament and Commission earlier in May of the same year came into force that abolished all roaming charges within the EU, Iceland, Liechtenstein and Norway.^[7]

Roaming between other countries

Countries that do not share a supra-national authority have also begun examining the provision of international roaming services. In April 2011, Singapore and Malaysia announced that they had agreed with operators to reduce voice and SMS rates for roaming between their two countries.^[8] In August 2012, Australia and New Zealand published a draft report proposing coordinated action on roaming services.^[9] This was followed by a final report in February 2013 recommending that the two countries equip their telecommunications regulators with an extended palette of regulatory remedies, when they investigate international roaming.^[10] The Australian and New Zealand prime ministers subsequently announced that they would introduce legislation to effect the recommendations of the final report.^[11]

Other types of roaming

Roaming sign shown in notification bar on an Android powered smartphone.

Regional or internal roaming

This type refers to the ability of moving from one region to another region inside national coverage of the mobile operator ("internal roaming"). Initially, operators may have provided commercial offers restricted to a region (sometimes to a town). Due to the success of GSM and the decrease in cost, regional roaming is rarely offered to clients except in nations with wide geographic areas like the US, Russia, India, etc., in which there are a number of regional operators.

In Russia even country-wide operators charge different tariffs depending on whether the users are within or outside of their "home region". A number of legislative attempts to remove the "internal roaming" failed due to opposition from operators.^[12] Following the annexation of Crimea in 2014 the Russian operators are facing significant criticism as they do not offer their services inside Crimea directly, even though formally it's recognized as a regular federal subject inside Russia.^[13]

National roaming

This type refers to the ability to move from one mobile operator to another in the same country. For example, a subscriber of T-Mobile USA who is allowed to roam on AT&T Mobility's service would have national roaming rights.
For commercial and license reasons, this type of roaming is not allowed unless under very specific circumstances and under regulatory scrutiny. This has often taken place when a new company is assigned a mobile telephony license, to create a more competitive market by allowing the new entrant to offer coverage comparable to that of established operators (by requiring the existing operators to allow roaming while the new entrant has time to build up its own network).

In a country like India, where the number of regional operators is high and the country is divided into telecom circles, this type of roaming is common. Following the launch of the Pebble Network in the UK on 15 July 2015, national roaming has been possible across the major UK networks at no additional cost using a Pebble Network SIM card.

International roaming

This type of roaming refers to the ability to move to a foreign service provider's network. It is, consequently, of particular interest to international tourists and business travellers. Broadly speaking, international roaming is easiest^{[according to whom?]} using the GSM standard, as it is used by over 80% of the world's mobile operators. However, even then, there may be problems, since countries have allocated different frequency bands for GSM communications (there are two groups of countries: most GSM countries use 900/1800 MHz, but the United States and some other countries in the Americas have allocated 850/1900 MHz): for a phone to work in a country with a different frequency allocation, it must support one or both of that country's frequencies, and thus be tri or quad band. If international roaming allows the traveller to stay connected during their trip, it can also generate significant costs for users. In fact, the use of mobile networks outside its original country can lead to significant billing by its original mobile data operator.^[14]

Inter-standards roaming

This type refers to roaming between two standards. This term is now widely used in mobile communications where especially CDMA customers want to use their phone in areas where there is no CDMA network or there is no roaming agreement in place to support roaming on the used standard. In Europe there are hardly any CDMA networks. Most CDMA customers originate from the Americas or the Far East. In order to enable them to roam in Europe inter-standard roaming is the solution. The CDMA customers arriving in Europe can register on the available GSM networks.

Since mobile communication technologies have evolved independently across continents, there is significant challenge in achieving seamless roaming across these technologies. Typically, these technologies were implemented in accordance with technological standards laid down by different industry bodies and hence the name. A number of the standards making industry bodies have come together to define and achieve interoperability between the technologies as a means to achieve inter-standards roaming. This is currently an ongoing effort.

Mobile Signature Roaming

Mobile signature Roaming allows an access point to get a Mobile Signature from any end-user, even if the AP and the end-user have not contracted a commercial relationship with the same MSSP. Otherwise, an AP would have to build commercial terms with as many MSSPs as possible, and this might be a cost burden. This means that a Mobile Signature transaction issued by an Application Provider should be able to reach the appropriate MSSP, and this should be transparent for the AP.^[15]

Inter MSC Roaming

Network elements belonging to the same Operator but located in different areas (a typical situation where assignment of local licenses is a common practice) pair depends on the switch and its location. Hence, software changes and a greater processing capability are required, but furthermore this situation could introduce the fairly new concept of roaming on a per MSC basis instead of per Operator basis. But this is actually a burden, so it is avoided.^[16]

Permanent roaming

This type refers to customers who purchase service with a mobile phone operator intending to permanently roaming, or be off-network. This becomes possible because of the increasing popularity and availability of "free roaming" service plan, where there is no cost difference between on and off network usage. The benefits of getting service from a mobile phone operator that is not local to a user can include cheaper rates, or features and phones that are not available on their local mobile phone operator, or to get to a particular mobile phone operator's network to get free calls to other customers of that mobile phone operator through a free unlimited mobile to mobile feature.

Most mobile phone operators will require the customer's living or billing address be inside their coverage area or less often inside the government issued radio frequency license of the mobile phone operator, this is usually determined by a computer estimate because it is impossible to guarantee coverage. If a potential customer's address is not within the requirements of that mobile phone operator, they will be denied service. In order to permanently roam customers may use a false address and online billing, or a relative or friend's address which is in the required area, and a 3rd party billing option.

Most mobile phone operator discourage or prohibit permanent roaming since they must pay per minute rates to the network operator their customer is roaming onto to. This is because they can not pass that extra cost onto customers ("free roaming").

Trombone roaming

Roaming calls within a local tariff area, when at least one of the phones belong outside that area. Usually implemented with trombone routing also known as tromboning.^[17]

See also

• GSM frequency bands


• Handoff


• Home Location Register


• 
  IEEE 802.11
  
  
  
  • IEEE 802.11f
  
  
  • IEEE 802.11r
  
  
  
  


• Mobile IP


• Mobile phone


• Mobile phones on aircraft


• Mobility management


• Regulation on roaming charges in the European Union


• Roaming sim


• TADIG codes


• UMTS frequency bands


• Vertical handoff


• Visitor Location Register

References

External links

Look up roaming in Wiktionary, the free dictionary.

• 
  Roaming - Using my mobile abroad: are prices dropping ? - European Commission
  


• Intra MSC Roaming


• Mobile Europe describes how the roaming industry will cope with pending EU legislation and the arrival of mobile VoIP


• 
  GSM operators and their roaming agreements - Index of GSM operators in a country, and their roaming partners indexed by country. Maintained by GSM Alliance