Method and device for processing control signals in a mobile station of a mobile telecommunications system

p0001description

p0002Method and apparatus for processing of control signals in a mobile station of a system Mobilfun

p0003The present invention relates to a method for processing of control signals in a mobile station of a mobile radio system according to the preambles of claim 1 and of claim 4 and an apparatus for processing of control signals in a mobile station of a mobile radio system according to the upper clauses of claims 8 and 11. FIG.

p0004Such a method and such an apparatus are known from the prior art. In mobile radio systems, such as the GSM (Global System for Mobile Communications), the PCN (Personal Communication Network), the PCS (Personal Communication System), the DECT (Digital European Cordless Telephone) system, etc. from the mobile stations, for example, when they are in idle state, receive control signals from the base station of the cell in which they are in, and base stations from other, usually adjacent cells at regular intervals. In the GSM system, for example, from an in Idlezustand located ends mobile station is regularly receiving field strength or the

p0005Reception level of the BCCH channels (Broadcast Control Channels) from up to 32 different base stations measured. In the active call state the receiving strength of the BCCH channels of up to 16 base stations is regularly measured in the GSM system from a mobile station. The results of the six most transmitting base stations are transmitted every 0.48 seconds by the SACCH (Slow Associated Control Channel) to the current base station.

p0006The BCCH channel is unidirectional from the respective base stations to the mobile station. Each cell of a Cellular network is associated with a base station serving the area of ​​the cell with BCCH information. If a mobile station, such as a mobile phone, booked into the mobile network, it receives in addition to the BCCH information Additional information relating to whether a call for the mobile station is present. The better the reception quality, the better the mobile station can decode this information and the higher is thus the accessibility of the mobile station.

p0007In the GSM system, it is, for example, the object of the respective mobile station, just the cell or base station to listen, from which it is the best reception quality expected. The best criterion for the reception quality, the reception level of the received signals. Therefore, the mobile station measures the times at which it receives no BCCH information of the current base station, in whose cell it is located, the reception levels of control signals, such as from BCCH signals of the neighboring base stations. Thereafter, the mobile station compares the receiving levels of the control signals of the adjacent other base stations with the reception levels of the control signals or BCCH signals from the current base station. The mobile station determines that the reception level of the control signals of another base station is greater than the receiving level of the control signals of the current base station, it changes to the other base station, the control signals have a higher level. The faster the base station detects this different level, the better accessibility.

p0008So one hand is desirable, the reception level of the control signals of the other base stations as often as possible to measure, on the other hand it costs every power in the mobile station to receive or to measure its reception level, the control signals of the other base station, since the Reception apparatus of the mobile station must be switched on during this period. The two aspirations for a low power consumption and an optimal reception quality or accessibility of the mobile station are thus actually each other in opposition. As already mentioned above, the receiving levels of the control signals of the current base station to the receiving levels of the control signals from other adjacent base stations are carried out in conventional mobile stations at regular intervals comparisons. These comparisons are also performed when the mobile station is not moving or if the data received from the current base station signals are received with sufficient quality, whereby unnecessary power consumption in the mobile station arises. This is particularly disadvantageous when the mobile station battery or battery powered.

p0009The object of the present invention is therefore to provide a method for processing of control signals in a mobile station of a mobile radio system according to the preambles of claims 1 and 4 and an apparatus for processing of control signals in a mobile station of a mobile radio system according to the preambles of claims 8 and 11, enabling a reduction in power consumption while ensuring an optimal reception quality.

p0010This object is achieved by a method for processing of control signals in a mobile station of a mobile radio system with the features of claim 1 or 4 and by a device for processing of control signals in a

p0011Mobile station of a mobile radio system with the features of claim 8 or 11 is released.

p0012Advantageous embodiments of the present invention are given in the respective subclaims. In a first variant of the inventive method for processing of control signals in a mobile station of a mobile radio system, in which control signals from a current base station and from other base stations received at the mobile station, the movement of the mobile station is measured and generates a movement of the mobile station characteristic measurement signal, wherein a decision is made in regard to the frequency of the reception and / or the measurement of the reception level of control signals from other base stations on the basis of this measurement signal. It can be measured in determining the amount of movement of the mobile station either the speed of the mobile station or the acceleration of the mobile station.

p0013In a second alternative of the inventive method for processing of control signals in a mobile station of a mobile radio system, in which control signals from a current base station and from other base stations received, the drift of the received from the current base station control signals gemssen and the drift of the control signals characterizing the measurement signal generated, on the basis of this detection signal a decision is made in regard to the frequency of the reception and / or the measurement of the reception level of control signals from other base stations. Here, in measuring the drift, either the

p0014Frequency drift, or the phase drift of the data received from the current base station control signals are measured.

p0015In both variants of the method according to the invention the measuring signal is advantageously compared with a predetermined threshold and decreases the frequency of the reception and / or the measurement of the reception level of control signals from other base stations, when the measurement signal is less than the predetermined threshold value. A first variant of the device according to the invention for processing of control signals in a mobile station of a mobile radio system comprising a receiving means for receiving control signals from a current base station and from other base stations, measuring means for measuring the movement of the mobile station and for generating a movement of the mobile station characterizing the measurement signal, and decision means that a decision regarding the frequency of reception and / or the measurement of the reception level of the measurement signal on the basis of this

p0016Control signals from other base stations meets. In this case, the measuring device is either a speed sensor which measures the speed of the mobile station, or an acceleration sensor that measures the acceleration of the mobile station.

p0017A second variant of the device according to the invention for processing of control signals in a mobile station of a mobile radio system comprising a receiving means for receiving control signals from a current base station and from other base stations, measuring means for measuring the drift of the received from the current base station control signals and for generating a drift said control signals characterizing the measurement signal, and a decision means for a decision regarding the frequency of reception and / or the measurement of the reception level of control signals incident on the basis of this measurement signal of other base stations. In this case, the measuring device either the frequency drift, or the phase drift of the data received from the current base station control signals can be measured.

p0018In both variants of the device according to the invention for processing of control signals in a mobile station of a mobile radio system, the decision means comparing the measured signal with a predetermined threshold and the frequency of reception and / or the measurement of reduce reception level of control signals from other base stations, when the measurement signal is less than the predetermined threshold value.

p0019can be obtained by the present invention thus in an advantageous manner, the power consumption can be reduced in a mobile station when the mobile station does not move. In this case it is not necessary to receive periodically the control signals from neighboring base stations or evaluate their reception level, as it can be considered generally from the fact that the contact and connection quality to the current base station remain unchanged. Even if the moving base station, by measuring the frequency drift or drift of the phase of the control signals from the current base station of the

p0020Energy consumption in the mobile station can be reduced since it is not necessary to receive and analyze the reception level when the signal quality of the control signals from the current base station remains the same, the control signals of adjacent base stations.

p0021The present invention is explained in detail below with reference to the accompanying single figure 1 in which a device according to the invention for processing of control signals in a mobile station of a mobile radio system is shown schematically.

p0022Fig. 1 schematically shows a receiving device 1, a measuring device 2 and a third decision means to the receiving means 1, an antenna 4 is connected, which receives the signals from the base stations and relays it to the receiving means 1. The control signals received by the antenna 4 from a base station are received and Enhancement in the receiving device the first The measuring means 2 measures, in a first variant of the device according to the invention the movement of the mobile station and produces a movement of the mobile station characteristic measurement signal. It can be either the measuring device 2, a speed sensor for measuring the speed of the mobile station or an acceleration sensor for measuring acceleration of the mobile station.

p0023In a second variant of the device according to the invention the measuring means measures the drift of the two received from the current base station control signals and produces a drift of the control signals characterizing the measurement signal. The two measuring means measures either the frequency drift, or the phase drift of the data received from the current base station control signals.

p0024In both variants of the device according to the invention the measuring signal generated is forwarded by the measuring device 2 to a decision device 3, a decision regarding the frequency of reception and / or the measurement of the reception level of control signals incident on the basis of this measurement signal from other base stations, and signals corresponding to outputs to the receiving device. the mobile station is not moving, for example, so the judging means 3, to reduce the frequency of receipt and / or the measurement of the reception level of control signals from other base stations or in whole. If the mobile station is placed in motion again, so the measuring device 2 are a corresponding signal, and the decision means 3, in turn, increases the frequency of the reception and / or the measurement of the reception level of control signals from other base stations.

p0025Likewise 3 reduces the decision means, the frequency of reception and / or the measurement of the reception level of control signals from other base stations, when the frequency drift, or the drift of the phase of the current base station received control signals is zero or is very low. Since in this case the control signals from the current base station is received with adequate quality from the mobile station, the frequency of the reception and / or the measurement of the reception level of

p0026Steursignalen be reduced or suspended from other base stations.

p0027In both variants of the device according to the invention the measuring signal from the measuring device 2, in the

p0028comparing decision means 3 with a stored, for example in the decider 3 predetermined threshold. If the comparison shows that the measured signal is less than the predetermined threshold value, the decision means decreases the frequency of the reception and / or the measurement of the reception level of control signals from other base stations. The decision means 3 are in this as in the above cases, a corresponding signal to the receiving equipment 1 further through which the

p0029is caused to receiving device 1, to increase the frequency of reception and / or the measurement of the reception level of control signals from other base stations corresponding or decrease.

p0030In a further variant of the device according to the invention a measuring device for measuring the movement of the mobile station and for generating a movement of the mobile station measuring signal characterizing and measuring means may for measuring the drift of the current of the

p0031Base station control signals received and combined to produce a drift of the control signals characterizing measurement signal. The two measurement signals can then be combined depending on the desired application, after which the decision means 3 on the basis of this combined measurement signal, a decision with respect to the frequency of Reception and / or the measurement of the reception level of control signals from other base stations meets. Furthermore, it is conceivable to use the measuring device for measuring the movement of the mobile station to enable the mobile station in a quick movement, or the mobile station at a rapid deceleration, such as to turn off for a table, when placing.