Multiplex communications – Communication over free space – Repeater
Patent
1995-09-20
1998-06-02
Chin, Wellington
Multiplex communications
Communication over free space
Repeater
370321, 370337, 370347, 455404, 455524, H04B 714, H04J 110, H04J 308
Patent
active
057611947
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an arrangement for producing an improved/extended range between the mobile units and the base station in a mobile digital communication system which includes base stations operating with time frames and mobile units operating with low transmitting power.
PRIOR ART
In digital radio systems which operate with time frames and are used in the general mobile telephone network, the coverage between a mobile unit included in a system and a normal base station is limited to the transmission power/output power of the mobile unit. When the mobile unit is located within the coverage area of the normal base station affected and transmits in uplink, it is not certain that the transmitting power/output power of the mobile unit will be sufficient for establishing a connection to the normal base station. In general public relay systems, it is previously known, from Patent Specification EPA-2092237, to use a repeating function for improving the effective coverage area. The repeating function repeats a first sequence of descending time slots in a first time frame from the first to the second station as a second sequence of descending time slots in a second time frame. Furthermore, the repeating function sends a first sequence of ascending time slots to the first station which responds to a second sequence of ascending time slots received from the second station. In cellular mobile telephone systems, it is previously known, from U.S. Pat. No. 4,972,456, to increase the coverage area by utilizing a number of satellite cells, the object of which is to transfer signals between the base station and the user who is located in one of the said satellite cells. Communication between the satellite cell and the base station occurs wirelessly via radio communication. The communication which takes place in both uplink and downlink is consequently carried out via the satellite cell. In mobile radio networks intended for data communication, it is previously known, from U.S. Pat. No. 4,882,765, to utilise a repeater. The repeater listens to the communication between mobile unit and base station and decides itself if a message needs to be repeated or not. The transmission time does not therefore need to be taken up by unnecessary repetitions. The communication is repeated by the repeater both in uplink and downlink.
In connection with digital mobile radio systems belonging to this category and having limited range for the mobile units, a number of methods have been proposed for improving the coverage between the mobile units and the base station by means of a repeating function, among others. The existing proposals, however, have entailed repeating functions with, among others, high power consumption and fixed placements within the coverage area of the normal base station. No known technique for improving the range between the mobile units and the base station in general mobile telephone networks (for example the GSM network) which entails minimum power consumption in the repeating function when no call is in progress, fast transfer of random access information to the normal base station, little time delay for speech during a call and a call channel with high transmission capacity has previously been found.
DESCRIPTION OF THE INVENTION
TECHNICAL PROBLEM
Current modern digital mobile telecommunication systems presuppose the widest possible effective coverage between a normal base station and mobile units in the network at the same time as being able to give the greatest possible consideration to the low output power that hand-portable mobile units are arranged to operate with. Furthermore, it is desirable, in present-day mobile telecommunication systems, to be able to introduce repeating units/functions, which repeating units/functions should be possible to place optionally within the coverage area of the normal base station without access to power or fixed connections from the remaining network. It should be possible to increase the coverage areas considerably at locations with low
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Carman Melissa Kay
Chin Wellington
Telia AB
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