Reducing radio transmissions in pico-cellular wireless communications

Pikozellulare, wireless communication systems are überwie quietly in accordance with the DECT (Digital European Cordless transmission) standard realized. In this in the document after directed engineering Electronics 42 (1992) Jan./Feb., no. 1, "Struk ture of the DECT standard ", page 23 to 29 described the DECT standard are the on the bidirectional radio transmission link between egg a base station and the wireless communication connected tion end devices transmission protocol used and the physical properties of the radio transmission link realizing transmitting and receiving devices set. The radio signals are in this case via the radio transmission route at a transmission frequency of 1.9 GHz, that is in transmitted microwave range. Such pikozellulare wire wireless communication systems with a limited Reich wide up to 200 meters are predominantly in private communi tions systems such as telephone branch equipment or telephone terminals used. Furthermore, known from the German DE 94 13 743 U1, instead of radio transmission routes realized transmitting / Empfangseinrichtun gen each an infrared transmission link realized provide transmitting and receiving devices. In wireless Communication systems with infrared transmission links only small transmission ranges achievable and the applica applications are designed for enclosed spaces.

For some of the users of pikozellularen, wireless Communication systems, negative influences of the Transmitting devices emitted, are in the microwave range the radio signals during the radio links to the user feared.

The the object underlying the invention is to provide a procedural reindeer and a communication system for reducing the radio links Extracts in pikozellularen, wireless communication systems Stalten. The object is in terms of the method by the features of patent entitlement 1 and the terms of the communication system by the features Claim 7 dissolved.

Advantageous embodiments of the invention are subject of Subclaims.

The essential aspect of the method according to claim 1 to see that in pikozellularen, wireless communication tion systems respectively in addition to the bidirectional radio transmission path bidirectional infrared transmission track is provided and the exchange of information, the Transmission quality of bidirectional Infrarotübertra transmission link is continuously verified. Dependent on of the verification result is the exchange of information via the bidirectional infrared transmission path or the bidirectional radio link control, wherein in an exchange of information on the infrared transmission Track-at least the imple the radio transmission link -generating radio-transmitting devices are disabled.

At the current exchange of information on bidirek tional radio link is at the same time over transmission quality of the two bidirectional directed part radio transmission links the infrared transmission path kon continuously verified and with sufficient transfer quality of one or both part infrared transmission links is the exchange of information via the bidirectional Infra controlled rotübertragungsstrecke and at least the radio-Sen deeinrichtungen the bidirectional radio link disabled - Claim 2. In a recent information exchange via the bidirectional infrared transmission link the transmission quality of the two bidirectional ge taught part infrared transmission links the infrared About transmission link continuously verified and made with non reaching transmission quality for at least one of the at the part of infrared transmission links is the information exchange via the bidirectional radio link ge controls, the transmission quality of bi-directional Infrared transmission path is further verified - At claim. 3

According to a further advantageous embodiment of the inventions to the invention process, the following receipt of more than Radio link transmitted radio signals of Infor mation controlled via the radio transmission link - Claim 4. By this measure it is ensured that for a recognition of an insufficient transfer quality of infrared transmission path and a switchover tion on the radio transmission path in each communication tion terminal or in the respective Kommunikationseinrich device by transmitting the radio signals to the wireless ver Thematic communication terminal and the communication input direction in this also a reversal on the radio transmission path occurs.

The inventive method is an especially before Advantageous control of pikozellularen in a wireless Communication system implemented radio transmission link achieved with an additional infrared transmission path, wherein through the continuous review of the transfer quality of infrared transmission link the Funkübertra transmission link is only activated if the transmis transmission quality of infrared transmission path no longer secure transmission of digitized Fernsprechsi signals sufficient. Analogously, the infrared transmission trackside reactivated unless the transmission quality of Infrared transmission link is sufficient again. This means, that in enclosed spaces such as in offices or Living rooms the wireless transmission of digitized Telephony signals via infrared transmission links and the Outdoors or in other, not with infrared transmission means equipped rooms wireless transmission automatically is controlled via a radio transmission link. By the The method according to the invention are the exchange of information by in pikozellularen, wireless communication systems switching to additionally arranged Infrarotübertra equalizing sections, the radio links and significantly reduced possible interference by the radio links with the formed in the microwave range radio signals to the user verrin of pikozellularen, wireless communication system siege. Another advantage of the process of the invention is to be seen in that with a reduction in the spark-over transfers due to lower transmission powers of Infra rotübertragungstrecke over the radio transmission link the average power consumption in the communication end devices is smaller and hence smaller energy storage are eingesetzbar or a longer operation time with unverän dertem energy storage is achieved. Smaller or loadable not chargeable power storage also decrease, taking into account the additional, the bidirectional infrared About transmission path realizing the weight components and the size of the communication terminal.

In the further claims 8 to 18 are particularly advantageous embodiments of a communication system to reduce Radio transmissions in a pikozellularen, wireless commu tion system is disclosed wherein for the realization of In frarotübertragungsstrecke infrared transmitting / Empfangseinrichtun gene and for the verification of the transmission quality of the Infrared transmission path as well as the reversal of the Informa tion exchange from the infrared to the radio transmission track and vice versa priority means are provided.

The method of the invention by means of a will Block diagram and a flow diagram illustrated in more detail. show case

<b>Fig.</b> 1 a realized method of the invention picocellular, wireless communication system and

<b>Fig.</b> 2 is a flowchart showing the in the components of pikozellularen, the wireless communication system according to <b>Fig.</b> 1 realized process of the invention.

The block diagram shows a communication terminal KE, which wirelessly to one of the communication devices to K closable. The communication terminal KE is repre tively shown for multiple communication terminals, which one of the communication devices illustrated fed K can be arranged. A communication device K by another communication terminal KEE, a base sta- station BS of a wireless telephone system, a communication tion system KA - in particular a telephone private branch Lenan location - or realized by a conversion device UE. The more communication terminal KEE example - by dashed lines indicated - with the communication system KA connected. The other communication terminal provides KEE For example, a telephone terminal of a public or private telecommunications network is, in which the further communica onsendgerät KEE on a public or private communication tion system or telephone system is connected.

The base station BS depicted example also connectable to the communications system KA - by dot broken lines indicated. At the base station BS are wire los communication terminals connected.

For the exemplary embodiment, it is assumed that the Darge presented communication terminal KE wirelessly to other Kom munikationsendgerät KEE associated wirelessly. Hereinafter are for realizing the method according to the invention in Communication terminal KE and the further communication terminal KEE device required components explained. Both the Communication terminal KE and the other commu onsendgerät KEE each have an antenna A, which on the bidirectional radio link FUS wirelessly ver connected are. The radio link is FUS by two bidirectionally directed partial radio transmission links (TFUs) - in <b>Fig.</b> 1 indicated by bracketed name. Over the radio link between the FUS and commu nikationsendgerät KE and the other communication terminal KEE be radio signals fs, for example according to the DECT Stan dard transmitted bidirectionally. According to the DECT standard have fs in the radio signals depending on the transmission Rich tion and the transmission channel used a frequency of 1835-1932 MHz. Furthermore, the digitized Voice signals in a time division structured power a together and to the wirelessly connected Kommunikationseinrich tions K transmitted. To implement the radio transmission trackside FUS is the antenna A with a transmission / Empfangsein direction SE-FU connected. In this, the incoming digital, time-division multiplex-oriented according to the DECT standard Voice signals sp fs in DECT-compliant radio signals and vice versa implemented. Implementations of such transmission / Empfangseinrich tions SU-FU are in the publication NTZ, Vol 46, 1993, Issue 10, pp 754-757 "architectures for a DECT transmitter and receiver: A comparison described ". Alternatively, the radio receiving device SE-FU and the antenna A is not in accordance with DECT Standard but according to other, picocellular a Kom munications coordinated transmission protocols and physical properties are realized.

Furthermore, both in the communication terminal device KE egg and in the other communication terminal KEE ne reali bidirectional infrared transmission path IUS Infrared-organizing transceiver unit provided ISE. A Infrared transmission path IUS is bidirectional by two directed partial infrared transmission links (TIUS) formed - in <b>Fig.</b> 1 angedeu by a bracketed name tet. An infrared transceiver unit ISE is known, by an infra-red transmitter and an infrared receiver diode rea lisiert. The infrared transceiver unit ISE's alternative as an independent, ie K from the communication device remote infrared transceiver unit ISEA realized - in <b>Fig.</b> 1 indicated by dashed blocks. The remote Infrared transceiver unit ISEA is advantageous in commu tions systems used, in which the communication device K and the communication terminal KE in below different rooms or buildings are located. Both the integrated as well as the remote Infrarotsendeempfangsein ISE unit, ISEA is each with an infrared receiving end university SE-IN connected. In this infrared receiving end university SE-IN are via the infrared transmission path IUS transferable infrared signals through the digital, ge according to time division structured with the DECT standard formed Voice signals modulated sp or on Infrarotübertra transmission link IUS transmitted infrared signals is demodulate lines.

Both transceiver devices SE-FU, SE-IN respectively via a bidirectional connection with a priority V control PST connected. This priority control PST On the one hand, the reversal of the incoming or leave the digitized, formed in accordance with the DECT standard Voice signals sp via the infrared transmission path IUS or radio transmission link FUS and together with the Infrared transceiver device SE-IN transfer Quali veri ity of the bidirectional infrared transmission path IUS fied. This is for example effected by the Level of the received infrared signals is in the Infrarotsen deempfangseinrichtung SE-IN measured and the measurement result on another connection L to the priority control PST is received and evaluated there. With or exceeded Falls below a predetermined level of infrared signals is is the current exchange of information either on the Infrared transmission path IUS or radio transmission trackside FUS controlled. Alternatively, the measurement of Nutz-noise signal interval of the received infrared signals is consulted for the measurement of the transmission quality. In this case, the measurement result also on the further Compound L transmitted to the scheduler and PST evaluated there. is With sufficient useful signal to noise ratio the exchange of information on the infrared transmission Track-IUS and nichtausreichendem distance of aktu elle exchange of information via the radio transmission link FUS controlled. For this purpose, in the priority control PST a Switching - not shown - provided. Deswei direct is monitored in the priority control PST, whether through the radio transmission link FUS radio signals received fs who the. If this is the case, then the outgoing digital, formed in accordance with the DECT standard voice signals fs also controlled via the radio transmission link FUS. This order circuit is required, since upon reception of Funksi nals fs is assumed that verbun wirelessly in which communication device K or the communication terminal KE gets insufficient transmission quality of Infra rotübertragungsstrecke IUS present and Informationsaus exchange was controlled in the radio transmission path FUS.

The communications system KA, the base station BS and the order setting device UE are with respect to the United invention procedure similar as the other communication terminal KEE constructed, ie A with an antenna, a Infrarotsen deempfangseinheit ISE, an infrared transceiver device SE-IN, a radio transceiver device SE-FU and a Scheduler PST.

In the conversion device UE is the priority control with a conversion unit connected UH. In this implementation unit UH for example, those formed in accordance with the DECT standard Voice signals sp in formed according to the GSM standard Sprachsi converted signals spg, said digitized speech signals remain unchanged in itself and only of a case example standardized transmission frames taken in another example standardized transmission frame to be inserted. The essential characteristics of the GSM standards are in the publication computer science spectrum <b>14</b> described (1991) June, No. 3, pp. 137-152, "The GSM standard". According to the GSM standard, the digitized speech signals precisely if multiplex structure inserted into the transmission frame, wherein the frame length on the transmission speed 890 is tuned to 960 MHz. Advantageously, this is in order releasing unit UH realized by a microprocessor unit, since digital DECT voice signals sp in digital GSM voice signals spg be implemented. The conversion unit UH is a realized according to the GSM standard transceiver SE-GSM connected. In this transceiver SE-GSM the digital, according to the GSM standard time multi plexstrukturierten voice signals into high-frequency sp Funksi signals fsg converted according to the GSM standard, and a space provided antenna AG not illustrated to a presented, wirelessly with the conversion device UE connected, further communication device a according to the GSM Stan dard realized communication system transmitted. Analogous For this purpose, according to the GSM standard received radio signals fsg spg in digital, GSM-standard speech signals converted puts. The conversion device is particularly advantageous in Motor vehicles used by more than one according to the DECT Stan dard realiliertes communication terminal to access a wireless, macrocellular communication system example as implemented in accordance with the GSM standard to be obtained; the wireless, macrocellular communication system respects Lich of transmission powers and procedures to meet the requirements the mobile vehicle (z. B. handover at a Fahrge speed is adjusted from 200 km / h). Here, the Exchange of information independently within the motor vehi ges about the low impact on the user engaged in frarotübertragungsstrecke IUS and at close range outside the gesteu motor vehicle via the radio transmission link FUS ert. Furthermore, is the reduction of the spark transfers, as previously explained, the average Reduces energy consumption, thereby lighter and smaller Communication terminal are designable, or longer Be operating times or longer talk times in the battery or Accumulators operation can be achieved. The Informationsaus exchange is used to simultaneously via the wireless connection realized according to the GSM standard communication system via the conversion unit UH and the GSM Sendeempfangseinrich tion SE GSM accomplished. The antenna A of the GSM Sendeemp fang device SE-GSM and the antenna AG of Sendeemp fang device SE-FU are outside the motor vehicle at are rated. Through the use of conversion device UE in addition to the possible influence of in Funkübertragungsein units formed radio signals - in the microwave range - at in addition the user of the influence on the Kraftfahrzeugelek significantly reduced tronics (z. B. the airbag). Alternatively, Conversion devices UE with a conversion unit and a Sen deempfangseinrichtung realized that according to another of those standards and communication protocols and other About transmission properties acting, wireless Kommunikationssy systems are coordinated. For the implementation of GSM or al ternativer transceiver devices SE-GSM are those described in respective wireless communication systems used of circuitry and programmatic components provided. For the implementation of the digital DECT voice signals sp is in GSM or alternative, digital voice signals spg advantageously a microprocessor system used.

<b>Fig.</b> 2 is an explanatory themselves substantially from running chart, which in the example by a micropro processor implemented priority controls PST and partially implemented in the infrared transceiver equipment IUS is. The illustrated advantageous reali, programmatically catalyzed process is at the beginning of an information exchange, ie at the start of a voice connection in each of the data subject NEN communication terminals KE or Kommunikationseinrichtun gen K started and cyclically in terms of a sampling of the Transmission quality of the infrared transmission path at IUS displayed measured values ​​to the end of the information exchange repeated. Alternatively - not shown - are interrupt controlled, programmatic realizations possible, Here the flow or part flow through a pre-admit NEN value falling below or exceeding measured in Ab dependence gestar from a current exchange of information tet is, and ends after the expiration.