Telecommunications – Transmitter and receiver at separate stations – With control signal
Patent
1996-08-19
1999-07-27
Olms, Douglas W.
Telecommunications
Transmitter and receiver at separate stations
With control signal
455 134, 455522, 455453, H04B 100, H04B 700, H04B 7185
Patent
active
059306840
DESCRIPTION:
BRIEF SUMMARY
1. Field of the Invention
The invention relates to a method for transmitting calls of different priorities in a cellular network which comprises in each cell at least one base station communicating with subscriber terminals within its area, and in which network the base station transmits power control information to the terminal equipments, which may adjust their transmit power on the basis of the power control messages from the base station, the calls of the network having different levels of priority.
2. Background
In conventional data transmission systems where call establishment is guaranteed, all calls are of equal value. In transmission systems, such as in cellular networks, where a terminal equipment must compete to have a channel for itself, there is often a need to guarantee a greater chance for important calls to have a connection than for so-called normal calls. This is realized in such a way that some call types or some users have been granted a higher priority in receiving a channel than others. Such prioritized calls or users may be emergency calls, the police, other authorities or a subscriber who has acquired a right to priority.
In present mobile phone systems, prioritized calls are indicated by means of information connected to signaling. When a user has wanted to make a prioritized call, he has indicated it in some manner enabled by the user interface of the terminal equipment, for example by means of a code or by calling some number, such as the general emergency number, the calls intended for which may have been automatically classified as prioritized calls in the mobile phone system.
In the call-establishment stage, the terminal equipment signals to the base station that the call is prioritized, and the base station treats the call after that in a manner defined separately in each system. In the present system, prioritized calls do not have, however, any priorities over the other calls with respect to the power control.
Especially in mobile phone systems applying the CDMA multiple access method, the transmit power of the terminal equipments is controlled from the base station in such a way that the base station receives the signals from the different terminal equipments with the same strength as accurately as possible. The purpose of this is to maximize the capacity of the system. In a case of overloading, the quality of all calls deteriorates in the same way, and the probability that calls near the cell border are disconnected increases, and so does the likelihood of incoming calls being blocked. Prioritized calls realized with the present methods have the same probability of being disconnected as normal calls.
SUMMARY OF THE INVENTION
The purpose of the present invention is to maintain a better quality and reliability for prioritized calls than what has previously been possible and to improve the probability of their call establishment also in cases of overloading.
This is achieved with the method disclosed in the preamble which is characterized in that calls with a high priority use a higher transmit power than what is allowed for calls with a lower priority.
Accordingly, in one aspect, this invention is a method for transmitting calls of different priorities in a cellular network which comprises in each cell at least one base station communicating with subscriber terminals within its area, and in which network the base station transmits power control information messages to the terminals, which may adjust their transmit power on the basis of the power control information messages from the base station, the calls of the network having different levels of priority. The invention is characterized in that calls with a high priority use a higher transmit power than what is allowed for calls with a lower priority.
In some embodiments, the power control information messages transmitted by the base station to the terminal equipment take into account the priority level of the call in such a way that a higher transmit power is used in calls with a high priority than in calls with a lower
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Jolma Petri
Keskitalo Ilkka
Kiema Arto
Sarkioja Juha
Savusalo Jari
Nokia Telecommunications Oy
Olms Douglas W.
Vincent David R
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