Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Patent
1997-10-27
2000-09-12
Pham, Chi H.
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
375220, 370231, 370235, H04L 2536, H04L 2540, H04L 700
Patent
active
061188344
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase of international application PCT/FI96/00654, filed Dec. 10, 1996 which designated the U.S.
FIELD OF THE INVENTION
The invention relates to a rate adaptation method and a rate adapter for a non-uniform non-transparent data transmission channel, especially in mobile systems having a non-standard transmission capacity at the radio interface
BACKGROUND OF THE INVENTION
Mobile systems generally refer to various telecommunication systems that enable private wireless data transmission for subscribers moving within the system. A typical mobile system is a public land mobile network (PLMN). The PLMN comprises fixed radio stations (base stations) located in the service area of the mobile network, the radio coverage areas (cells) of the base stations providing a uniform cellular network. A base station provides in the cell a radio interface (air interface) for communication between a mobile station and the PLMN. Since mobile stations can move in the network and they have access to the PLMN through any base station, the PLMNs are provided with complicated arrangements for subscriber data management, authentication and location management of mobile subscribers, for handovers (a change of a base station during a call) etc. The networks are also provided with services that support the transmission of information other than the usual speech calls (speech service), such as data, facsimile, video image, etc. These new services have required a considerable amount of developmental work and new arrangements in the networks.
Another area of mobile systems includes satellite-based mobile services. In a satellite system, radio coverage is obtained with satellites instead of terrestrial base stations. The satellites are located on an orbit circling the earth and transmitting radio signals between mobile stations (or user terminals UT) and land earth stations (LES). The beam of the satellite provides on the earth a coverage area, i.e. a cell. The coverage areas of individual satellites are arranged to form continuous coverage so that a mobile station is located at all times within the coverage area of at least one satellite. The number of the satellites needed depends on the desired coverage. Continuous coverage on the surface of the earth might require for example 10 satellites.
Subscriber mobility requires similar arrangements in satellite mobile systems as in the PLMNs, i.e. subscriber data management, authentication and location management of mobile subscribers, handovers, etc. The satellite systems should also support similar services as the PLMNs.
One way of implementing these requirements in satellite mobile systems is to use existing PLMN arrangements. In principle this alternative is very simple since a satellite system can be basically compared to a base station system of a mobile system having an incompatible radio interface. In other words, it is possible to use a conventional PLMN infrastructure where the base station system is a satellite system. In such a case, the same network infrastructure could in principle even contain both conventional PLMN base station systems and satellite "base station systems".
There are many practical problems related to the adaptation of the PLMN infrastructure and a satellite system, however. A problem apparent to the Applicant is that a PLMN traffic channel and a traffic channel of a "radio interface" in a satellite system differ considerably. Examine an example where the PLMN is the Pan-European digital mobile system GSM (Global System for Mobile Communication) and the satellite mobile system is the Inmarsat-P system that is currently under development.
A traffic channel in the GSM system supports data transmission at the user rates of 2400, 4800, 7200 and 9600 bit/s. In the future, high-speed data services (HSCSD=High speed circuit switched data) employing two or more traffic channels at the radio interface (multi-slot access) also support higher user rates (14400 bit/s, 19600 bit/s, . . . ). Non-transparent data services also utilize a rad
REFERENCES:
patent: 5367534 (1994-11-01), Chou et al.
Data Communication Over the Telephone Network, List of Definitions for Interchange Circuits Between Data Terminal Equipment (DTE) and Data Circuit Terminating Equipment (DCE), ITU-T Telecommunication Standardization Sector of ITU, ITU-T Recommendation V.24, Mar. 1993, pp. i-19.
Data Communication Over the Telephone Network, Support Data Terminal Equipments with V-Series Type Interfaces by an Integrated Services Digital Network, CCITT The International Telegraph and Telephone Consultative Committee, Recommendation V.110, Sep. 1992, pp. 1-58.
"European digital cellular telecommunications system (Phase 2); Radio Link Protocol (RLP) for data and telematic services on the Mobile Station--Base Station System (MS-BSS) interface and the Base Station System--Mobile-services Switching Centre (BSS-MSC) interface (GSM 04.22)", European Telecommunication Standard.
Source: ETSI TC-SMG Reference: GSM 04.22, ETS 300 563, UDC: 621.396.21, Sep. 1994, pp. 2-63.
European digital cellular telecommunications system (Phase 2): Terminal Adaptation Functions (TAF) for services using asynchronous bearer capabilities (GSM 07.02), European Telecommunication Standard, Source: ETSI TC-SMG Reference GSM 07.02, UDC: 621.396.21, Jul. 1994, pp. 2-21.
Corrielus Jean B
Nokia Telecommunications Oy
Pham Chi H.
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