Method for transmission of measurement information from connected components to a central station in a point to multipoint communication system

0001In a point-to-multipoint communication system - for example, in wireless radio systems or fiber optic communications networks - Communicate the communication terminals - For example, wirelessly through DECT or CDMA communication terminals - With central facilities - at wireless connection, for example, radio base stations. The Transmission path is in wireless connection usually under the standardized DECT or CDMA transmission and access methods realized. In the DECT standard are as access methods the TDMA (Time Division Multiple Access) - and the FDMA (Frequency Division Multiple Access) method is provided, wherein a wirelessly connected communication terminal in each case at least one time slot within a is assigned to a plurality of frequency ranges. In CDMA (Code Division Multiple Access) is within -Zugriffsverfahren establish a connection each wirelessly connected communication terminal within one of possibly. several frequency ranges at least one orthogonal transmission code allocated. The TDMA, FDMA and CDMA transmission or access method come adapted well using fiber optics or in wired point-to-multipoint communication networks for use.

0002In order for CDMA and TDMA, the synchronicity of the transmitted Signals - the TDMA method in the synchronicity of the central facility received time slots with each other and the CDMA method, the synchronicity of the at central facility received signals - to ensure, are measuring-method or methods used, with their Help a Einmeßinformation of the components to the central transmitted component and in this correction information determined and transferred to the decentralized components will. For this purpose, for example, the TDMA method certain kept free time slots at periodic time intervals, on of the communication terminals calibration data - For example, wirelessly - transmitted to the central device will. In the central facility maturities are the transmission path - for example, the air interface - Determined and a corresponding correction information transmitted to the affected communication terminal. The information to be useful information is by means the correction information in such a manner in the respective time slot sent that they timeslot justice central to the Means arrive.

0003It is also known that Einmeßinformationen via data channels transmit, with respect to the frequency of the data channels separated for transmission of the payload information are. Here, for the transmission of Einmeßinformationen a pilot channel is provided, which in a separate frequency range is realized. In both described previously Einmeßverfahren is an additional transmission capacity the transmission line required that only through a significant additional terms of circuitry and Programmatic Expenditure can be provided.

0004The the object underlying the invention is to provide the Calibration of devices connected to a central facility - especially wireless - improving components. The task is achieved by the features of claim 1.

0005The essential aspect of the inventive method to see that the calibration of the connected communication terminals during operation of the transmission path without affecting the used transmission channels can be carried out. This is achieved in that the Einmeßinformationen with respect to the for the transmission of lower provided payload transmission level Transmission level and a party for the transmission of provided payload transmission speed lower transfer speed of the components are transmitted to the central facility. Furthermore is due to the significantly lower data rate the cost of an implementation of the invention Process considerably compared to the known method reduced. Another advantage of the present invention Method is that for different transmission paths - Eg CDMA or TDMA air interface - or Transmission media can be used.

0006According to an advantageous embodiment of the invention Method of transmission level is chosen so small that the Nutz-noise signal distance remains unimpaired - claim 2. This means that the level of the emitted Einmeßinformationen is chosen so small that this of the noise level Level of the budget for the transmission of content Transmission signals, ie, the useful noise signal distance of the transmission of content intended transmission signal is.

0007According to another embodiment of the inventive method be the information to be useful information (ni) scrambled - claim 3. By the Verscrambelung Payload are the disturbances causing continuous layers - Particular binary one or zero duration layers - avoided and thus the information to be Einmeßinformationen low disturbed.

0008In wireless communication systems or wireless communication networks are the components of the point to multipoint communications system wirelessly using radio equipment connected to the central device - claim 4, wherein the transmission or access method for connecting advantageously ACCORDING to the DECT or CDMA transmission method are configured - claim. 5

0009The inventive method is also for optical wireline communication networks is provided, wherein the components using optical or wired transmission equipment optical or wired to the central Means are connected - to claim. 6 and 7 Here, the reduced level and transmission speeds in optical realization on the optical level and the optical transmission speed based.

0010The method of the invention by means of a will explained the block diagram in detail.

0011The block diagram shows a point-to-multipoint communications network, the example, by a radio communications network FKN is realized. The central apparatus of the radio communication network FKN provides for one radio cell a base station BS is, to the communication terminal KE .. are connected wirelessly. In exemplified a communication terminal KE, and in the base station BS are responsible for explaining the inventive method prerequisites specified.

0012In communication terminal KE is a clock generator TG to Education of clock signals ts with the transmission speed c and of further clock signals ts' at a transmission speed / X disposed of c. With the clock signals ts (c) are formed in the communications terminal KE and in a buffer ZSP stored useful information ni read and via a switch S to a radio / transmitter unit FSE in the sense of a wireless transmitting to the base station BS transmitted. The transmission level of the payload sp ni in this case corresponds to the level of from the intermediate storage ZSP read useful information ni.

0013In a memory SP which Einmeßinformationen stored simp. This Einmeßinformationen be simp using the other clock signal ts read 'and an attenuator DG and the switch S also to the radio / transmitter unit FSE controlled. According to the invention, the transmission speed c / x of the further clock signals ts' significantly low, which in the exemplary embodiment, the transmission speed c / x, = x, for example, 100 voted. This results in a 100-fold lower transmission rate c / x with respect to the transmission speed c of the payload ni. With the help of the attenuator DG, the level is read from the memory SP Einmeßinformation simp lowered for example by a factor of 10 or 20 dB. With the help of the switch S, the Einmeßinformation is simp during the calibration phase, ie, for example, when establishing a connection connected to the RF / transmission unit FSE.

0014The attenuator DG may also in the radio / transmitter unit to reduce the transmission level of emitted radio signals fs be arranged - not shown. This realization is particularly important in a predominantly digital configuration the above described components provided.

0015In the base station BS, the received radio signals are fs received wirelessly by means of non-illustrated components and the useful or Einmeßinformationen contained therein ni, amplified by an amplifier V simp. The separation the two information ni, simp is using a Einmeßfilters FE and a data filter FD causes the Remove the transmission speeds c, c / x the payload Voted ni or Einmeßinformation simp are. The filtered payload ni and due the large bandwidth of the data filter FD low filtered Einmeßinformation simp low level sp 'is in a Discriminator DIS in terms of their level for recognizing Payload ni rated. The thus detected payload ni is at the other components - not shown - The base station BS forwarded. The low Shares Nutzinformationssignale n arrive via another Einmeßfilter FE 'to an input E' of a subtractor SUB, at whose other input the output of the E Einmeßfilters FE is connected. The output A of the subtracter SUB is a further discriminator DIS 'on further, assessing Einmeßinformation simp performing Components - not shown - of the base station BS out. By subtracter SUB, the disturbing influence the low-frequency content of the message information signal by subtracting it eliminated from Einmeßsignal, ie it is the disturbing influence simultaneously transmitted payload ni in operation in the receive path on the Einmeßinformationen reduced simp. Subsequently, the further discriminator DIS 'the Einmeßinformation simp to Evaluation as regards the level of Einmeßinformations-level supplied. Here, by comparison with Pegelschwellwerten the existence of Einmeßinformation detected simp. The determined Einmeßinformation is simp particular for Determining correction information to the not shown Components of the base station BS forwarded. at a realization according to the standardized DECT transmission and access method, for example by determined correction information, the transmission timing of a Time slot within one affected by the communication terminal communicated shared transmission channel.

0016According to the invention due to the low transmission rate the Einmeßinformation simp in the receiving branch in the base station BS noise or are the noise signals more suppressed, so that the Eimmeßinformationen simp or calibration data can be securely evaluated.

0017The inventive method is in all wired, optical and radio communications systems used, wherein the level attenuation in digital processing of livestock and Einmeßinformation ni simp in the transmission or transmission facilities and for analog processing of livestock and performed Einmeßinformation ni simp to this self becomes.