Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
1998-02-23
2001-01-30
Nguyen, Lee (Department: 2746)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S450000, C455S517000, C370S336000, C370S345000, C370S350000, C370S352000, C370S354000
Reexamination Certificate
active
06181947
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a system for the wireless transmission of a frame-synchronized signal between a base radio station and at least one mobile terminal, which base radio station is provided for defining, prior to the transmission of data of a synchronous service, the periodically occurring frames which are to be used and a constant number of synchronous channels for the duration of the connection.
2. Description of Related Art
Such a system is, for example, a radio transmission system operating according to the GSM standard and for which embodiments of the GSM system are discussed in the publication “Daten{umlaut over (u)}bertragung mit GSM”, Funkschau, no. 3, 1997, pp. 68 to 70. In this article is described, more particularly, the data exchange between data networks (for example Internet, X.25) and mobile terminals. For example time slots or channels for a service are then combined to reach higher transmission rates.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a system for the wireless transmission of a frame-synchronized signal between a base radio station and at least one mobile terminal, which system has a higher flexibility.
The object of the invention is achieved by a system of the type defined in the opening paragraph in that the base radio station and at least one mobile terminal are provided for transmitting packets containing data of an asynchronous service in the frame-synchronized signal and in that the base radio station is provided for defining for each respective frame a number of asynchronous channels used for transmitting the packets.
Such a wireless system may be, for example, a radio transmission system, an infrared or an ultrasound system. A base radio station generally comprises at least a base radio station which controls, for example, the radio traffic with the mobile terminals and may also include, for example, mobile switching centers. Service data are transmitted between the base radio station and the mobile terminals. A distinction is then to be made between data of a synchronous and of an asynchronous service. Synchronous service data are, for example, speech data, that is, data of a conversation between at least two participants, in which a continuous data flow without long delay times is necessary. Asynchronous service data are packets produced by a packet transmission system. They may be, for example, cells in the asynchronous transfer mode (ATM). It is also possible for the base radio station or a mobile terminal to combine data to packets and transmit the packets.
The base radio station defines the synchronous channels for the duration of a connection, which channels are used for receiving synchronous data. Such a synchronous channel need not be rendered available to each successive frame, but may also be used periodically, for example, every third frame. If a connection is set up for a synchronous service, respective synchronous channels are then to be rendered available for the whole duration of the connection. But this does not exclude that different channels with different time frames are used for this connection. For example, a synchronous service may use the channels referenced
4
,
6
and
7
during a first frame, and the channels referenced
5
,
6
and
8
during a second frame.
The range of the frame that is not needed by the synchronous services is used for receiving packets or data of an asynchronous service. The seizure of the asynchronous channels is renewed for each frame by the base radio station. For example, an asynchronous service may use the asynchronous channels
4
,
8
,
9
and
11
during a first frame, the asynchronous channels
4
and
7
during a second frame, no asynchronous channel during a third frame and the asynchronous channels
1
,
2
and
4
during a fourth frame. As a result of the measures according to the invention, the system can react to load changes much more flexibly than the known systems.
A mobile terminal announces the respective service requirements to the base radio station over at least one control channel of the frame-synchronized signal. The base radio station is provided for defining the channels for the transmission between the radio base station and at least one mobile terminal and, over a control channel of the frame-synchronized signal, for informing at least one mobile terminal of the channels that have been allocated. In addition to the synchronous and asynchronous channel, the frame-synchronized signal includes control channels over which the radio links are set up and cleared and over which control data are exchanged between base radio station and mobile terminal. It is also possible that the number of control channels and the number of bits of one control channel are varied. The control channels and the synchronous and asynchronous channels may optionally be divided in the frame. The simplest realization is found when the control channels, the synchronous channels and the asynchronous channels are combined.
A mobile terminal and a base radio station include an insertion-cum-extraction device working under the control of a MAC control circuit for the insertion or extraction of data of a synchronous service into or from at least one synchronous channel and inserting or extracting packets into or from at least one asynchronous channel. The base radio station is provided for allocating the available asynchronous channels per frame in dependence on the number and priority of packets in a buffer device of the base radio station or of a mobile terminal.
The base radio station or a mobile terminal insert a word into a synchronous channel and a packet into an asynchronous channel. The base radio station additionally defines the number of the synchronous and asynchronous channels per frame.
The invention further relates to a base radio station and a mobile terminal.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
REFERENCES:
patent: 4987571 (1991-01-01), Haymond et al.
patent: 5392280 (1995-02-01), Zheng
patent: 5533019 (1996-07-01), Jayapalan
patent: 5570355 (1996-10-01), Dail et al.
patent: 5825770 (1998-10-01), Coady et al.
patent: 5933426 (1999-08-01), Motoori
“WATMnet: A Prototype Wireless ATM System for Multimedia Personal Communication”, Dipankar Raychaudhuri, Leslie J. French, Robert J. Siracusa, Subir K. Biswas, Ruizi Yuan, Parthasarathy Narasimhan and Cesar A. Johnston, Journal on Selected Areas in Communications, vol. 15, No. 1, Jan. 1997, pp. 83-95.
Du Yonggang
Kraemer Rolf
Halajian Dicran
Nguyen Lee
Nguyen Simon
U.S. Philips Corporation
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