Telecommunications – Carrier wave repeater or relay system – Monitoring
Patent
1996-09-12
2000-04-18
Nguyen, Lee
Telecommunications
Carrier wave repeater or relay system
Monitoring
455 7, 455 111, 370337, 370347, 370445, 370461, H04B 1702
Patent
active
060525576
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for using repeaters in a mobile radio system comprising a first repeater operating as a repeater, and a second repeater which does not at first operate as a repeater.
BACKGROUND OF THE INVENTION
The invention relates to the field of mobile phone systems. A subscriber in a mobile phone system, i.e. a subscriber station, for instance a mobile phone or a mobile station, may be registered in a radio network or system, whereby it communicates with the radio network via system channels comprised of control and traffic channels maintained by the base stations of the radio network.
In addition to the system channels in mobile phone systems, so-called direct mode channels can also be used in connection with a radio system, i.e. direct mode operation is applied. Subscriber stations using direct mode operation do not communicate directly with the radio network or its base stations. Direct mode channels are frequencies on which mobile phones or other means of communication are able to communicate directly with each other without the system, or via repeater stations either with the base stations of the system or with other mobile stations.
Direct mode channels are typically used in situations where, for instance, a group of portable mobile phones are communicating with each other at such a long distance from the base station that system channels cannot be used.
Another important way of using direct mode channels is to increase the capacity when the traffic in the system increases rapidly in some part of the service area of the system, for instance in some point-like part of the radio network.
A direct mode channel is referred to with the terms direct or simplex channel, or a simplex connection. A direct mode channel is a channel which is typically not at all used by the system. For example, it may be a channel with the same channel spacing as the channels of the system, for instance 12.5 kHz or 25 kHz. Among the mobile phones operating on a direct mode channel, the transmitting station has tuned its transmitter to the channel and transmits speech or data information. The other mobile phones set to direct mode operation have tuned their receivers to the same channel, whereby they are able to directly hear the transmission.
Operation on a direct mode channel may take place on the analog or digital modulation principle. A mobile phone transmitting on the channel may also transmit signalling information, such as information on rights of use and priorities or on the group operating on the channel. On the direct mode channel, an encryption may be carried out or plain speech can be transmitted.
Subscriber stations using direct mode operation communicate with other subscriber stations on a direct mode channel without necessarily being in direct contact with the base stations of the radio network. However, the subscriber stations using direct mode operation can also communicate with the radio network via repeater stations. A repeater station is a piece of equipment comprising two radio apparatuses connected to each other. The repeater stations typically comprise two transceivers. The repeater station transmits the information messages transmitted on the direct mode channel to desired network elements, for instance to the base stations of the radio network, these base stations transmitting the information messages further to the switching centres of the radio network. The information messages transmitted by the repeater station may, for example, be speech or consist of data or signalling messages. When a repeater is used, the direct mode channel employs, for example, a semiduplex mode of operation. It should be noted that the repeater station may also be a repeater repeating traffic between mobile stations communicating on the direct mode channel.
It should be noted that, in direct mode operation, the repeaters/repeater stations may also repeat traffic between two mobile stations located within the coverage area of each respective repeater, but not necessarily
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Kinnunen Kimmo
Schroderus Osmo
Nguyen Lee
Nokia Telecommunication Oy
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