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:
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CAMEL control service of basic circuit switch calls: It
implements authentication and accounting of voice calls.
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CAMEL control service of GPRS: It implements authentication
and accounting of GPRS bearers.
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CAMEL control service of SMS: It implements authentication,
accounting and transfer of SMS.
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CAMEL control service of USSD.
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CAMEL control service of mobility management.
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
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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.
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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.
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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.
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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.
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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.
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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:
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Circuit real-time multimedia service: The implementation of
multimedia service in the circuit domain mainly uses H.324/M protocol.
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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.
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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.
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