2.2 Details of Typical 3G Services

2.1.1  CAMEL Phase 3 Intelligent Service

CAMEL Phase 2 is implemented in GSM, mainly providing the prepaid service. CAMEL Phase 3 needs to be implemented in UMTS. Phase 2 supports services such as CS, USSD (Unstructured Supplementary Service Data), SS (Supplementary Service) and CF (Call Forwarding). On this base, Phase 3 has added support for GPRS, SMS, MM and LCS (optional).
Service category:
l   CAMEL control service of basic circuit switch calls: It implements authentication and accounting of voice calls.
l   CAMEL control service of GPRS: It implements authentication and accounting of GPRS bearers.
l   CAMEL control service of SMS: It implements authentication, accounting and transfer of SMS.
l   CAMEL control service of USSD.
l   CAMEL control service of mobility management.
l   CAMEL control service of location information.

2.1.2  Location Services

It is widely accepted in the industry that the LCS has a promising market and commercial prospect. LCS has been commercialized in GSM and GPRS networks in China and other countries. In the 3G field, because of improvement of location precision and application of the open system structure, LCS is very attractive. It may become one of the main killer services in 3G. There are the following types of LCS:
l   Public security service
In the United States, October 1, 2001 started the provisioning of the Enhanced Emergency Services. The FCC (Federal Communications Commission) stipulated that wireless operators should provide an estimated value of longitude and latitude of the caller. The precision should be within 125 meters (67% of the estimated value) or lower than the result by root mean square. Mainly driven by national laws, this kind of service is provided by operators for the public interest. It is available without user’s application. To operators, it is a non-profitable service but can promote operator’s image. And this service is an inevitable development result of mobile communication technologies.
Besides emergency calls, there is also vehicle rescues: If a vehicle is broken on the road, a fault locating automatic report is available. If there is an accident, the detection device will detect it and auto report the related information such as location of the accident.
l   Location Based Charging
Specific user charging: Some location areas (LAs) can be set as discount areas. In these LAs, calling and answering will be discounted.
Close location charging: If the caller and the called are in the same LA or close LAs, they will get a discount.
Specific area charging: If one or both of the caller and called are in a specific location, such as shopping area, a discount will be given. It is to encourage the user to enter this area.
l   Enhanced Call Routing (ECR)
The ECR enables user’s calls to be routed to the nearest service point according to the location. The user can implement corresponding tasks with specific access numbers. For example, the user can input 427 to have access to the nearest gas station. This service is available for chain companies, such as Caltex and KFC. The companies can apply for specific access numbers or preferential access number that will be preferred for access among the counterparts (such as gas stations). To bank services, the user can get the latest bank information or ATM information through ECR.
l   Location Based Information Services

 Following are examples of service applications:
City sightseeing: Providing direction navigation between touring sites, or indicating touring sites nearby, and finding the nearest hotel, bank, airport, bus station or relaxation place.
Location-based content broadcast: It can deliver messages to users in a specific area. It is mainly used in advertisement services, for example, delivering advertisements to users in or near a shopping center to attract customers. It can also filter users. For example, the administration of a port can deliver dispatch messages to the staff within the port area. In addition, activities schedules can also be delivered to tourists in the sightseeing area.
l   Mobile yellow page
Mobile yellow page is similar to ECR. It provides contact information of the nearest service point according to user’s needs. For example, the customer can input an entry “restaurant” or more conditions such as “Chinese food” and “within 3 kilometers” to search. The output result can be phone numbers or addresses.
l   Network Enhancing Services
This service is still yet to be defined. At present lawful interception service is available. Lawful interception is the ability to intercept Content of Communication (CC) and Intercept Related Information (IRI) of an MS by the 3G system for Law Enforcement Agency (LEA). The mobile target can be local subscribers, or subscribers roaming from other 3G systems, or roaming subscribers that can use the 3G system from other mobile networks, such as GSM subscribers.

2.1.3  Multimedia Service

In 3G, distributed multimedia service is the first to be developed. With a little bandwidth, voice service is the first to be developed, especially with the wide use of high-compression-ratio MP3. The first application of video service is unidirectional video application based on low bit rate and small image MPEG4 mode, such as real-time advertising service, or movie clips.
Details of service types:
l   Circuit real-time multimedia service: The implementation of multimedia service in the circuit domain mainly uses H.324/M protocol.
l   Packet real-time multimedia service
Multimedia service in the packet domain is mainly implemented via the SIP protocol. The major applications include 384 Kbps Video On Demand (VOD) and mobile teleconference. An example of VOD service is illustrated in Figure 2-2.
l   Non real-time multimedia message service
This service is called MMS (Multimedia Message Service), a natural development of SMS. Technically speaking, SMS delivers text format messages through signaling, only able to deliver or receive text-only messages with a capacity of a little bit more than one hundred bytes. MMS, with rich service supporting capabilities, can deliver multi-functional message containing text, images, video, audio and data.

2.1.4  Other Typical Services

1. PUSH Service

PUSH service is kind of push technology. It means the network side (mainly the web sites) initially pushes messages to subscribers, such as weather broadcast, stock information, news, adverting service, traffic information and other customized messages. 
To the research and discussion of PUSH service, 3GPP proposes series of implementation schemes. These schemes include: PUSH service implemented by using network-initiated PDP context activation process; PUSH service implemented by using network-initiated PDP context activation process triggered by DNS query; PUSH service implemented by using SMS; PUSH service implemented by using “on line for ever”, PUSH service implemented based on the SIP protocol, and PUSH service using the HTTP protocol.

2. PORTAL service

PORTAL service is a kind of service based on PUSH service.
When the user accesses the Internet, the network will push portal pages. To the network operators, they can get advertising fees from the pages. To the subscribers, they can access the Internet in a foolproof way, and get public information such as weather, traffic and stock for free.

To enhance this service, mobile subscribers can click the page to select each ISP, or access an enterprise network without fussy inputs. 

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