CA2304654A1 - Method for synchronizing a mobile component of a multiplex-operated mobile radiotelephone system - Google Patents
Method for synchronizing a mobile component of a multiplex-operated mobile radiotelephone system Download PDFInfo
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- CA2304654A1 CA2304654A1 CA002304654A CA2304654A CA2304654A1 CA 2304654 A1 CA2304654 A1 CA 2304654A1 CA 002304654 A CA002304654 A CA 002304654A CA 2304654 A CA2304654 A CA 2304654A CA 2304654 A1 CA2304654 A1 CA 2304654A1
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- base station
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- dummy bearer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/32—TPC of broadcast or control channels
- H04W52/325—Power control of control or pilot channels
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to a method for synchronizing a mobile component (PP1) of a multiplex-operated mobile radiotelephone system and to such a mobile radiotelephone system, in which at least one dummy bearer (DB1) having a given power output (P1) is sent by a base station (FP) and the mobile component (PP1) searches for a dummy bearer (DB1) until synchronization with the base station is achieved, wherein the mobile component constantly detects a measured value (RSSI) for the received field strength. The mobile component (PP1) sends a request (REQ) to the base station (FP) when a predetermined field strength measured value (RSSImax) is exceeded, whereupon the base station (FP) sends an additional dummy bearer (DB2) with reduced output power on another channel (Kb).
Description
MAR-20-00 12:56 3128760898 P.02 R-654 Job-122 03/20/00 MON 11:57 FAX 3128760898 HILL LAW FIRM 0 002 METHOD FOR SYNCHRONIZING A MOBILE COMPONENT OF A
MULTIPLEX-OPERATED MOBILE RADIOTELEPHONE SYSTEM
The invention is directed to a method for synchronizing a mobile part of a mobile radio telephone system working according to a multiplex method, whereby at least one dummy bearer having a specific power is transmitted from a base station and a dummy bearer is sought on the part of the mobile part until synchronization with the base station is achieved, whereby the mobile part constantly determines a measured value for the reception field strength.
Mobile radio telephone system that works according to a multiplex method, having at least one base station and at least one mobile part, whereby the base station is configured for transmitting at least one dummy bearer in a channel from a plurality of channels, and whereby each mobile part comprises a ItF part, a burst mode controller and a micro controller and is configured for seeking a dummy bearer with a suitable identity until it has synchronized to this dummy bearer. [sic]
The following description refers mainly to a DECT cordless telephone system; however, the invention can be equally employed to other mobile radio telephone systems that comprise the features assumed here.
The DECT system is a frequency division multiple access/time division multiple access system (FDMA/TDMA) with time division duplex (TDD) in a Pico-2 0 cellular structure, whereby the frequency band available is divided into 10 carrier frequence according to the standard currently in force. Each of these carriers offers 24 time slots, namely 12 for the radio path base station-mobile part and 12 for the radio path mobile part-base station. Further details about the DECT systexn are compiled in the article , "Struktur des DECT-Standards", U. Pilger, Nachrichtentech., Elektron., Berlin 42 (1992) 1, pages 23 through 29. Further details can be found in DECT-related ETS1 Standards, published by the European Telecommunications Standards Institute. The content of these recommendations is assumed to be known by a person skilled in the art.
MAR-20-00 12:56 3128760898 P.14 R-654 Job-122 03/20/00 MON 12:01 FAX 3128760898 HILL LAW FIRM f~014 Substitute Page After a mobile part is turned on, this must fast seek a synchronization with a base station. For this purpose, each base station transmits what is referred to as a dummy bearer that is composed of the date of a time slot, whereby, however, data are not yet transmitted in the B-field, the principal part of the data field (D-field). For seeking a dummy bearer, the mobile part in the prior art cyclically searches for a base station in the entire frequency band that must comprise a suitable identity (radio fixed part identification). Given a plurality of suitable base stations, that having the highest field strength is selected, this ensuing on the basis of what is referred to as the RS SI
value (radio signal strength indicator). The control of the search ensues via the burst mode controller that looks for even-numbered time slots on a first frequency for a specific time, for example 40 ms in what is referred to as "slow hopping", and then searches for base stations on odd-numbered time slots. In contrast thereto, the sweep is sequential in "fast hopping". The next frequency is then set and another search is carried out, first for even-numbered and then odd-numbered time slots, etc.
If, after sweeping all 10 frequencies, no basic [sic] was found, various algorithms can be activated, in accord wherewith the search procedure is repeated at certain time intervals that also potentially become longer and longer.
Given cordless telephone systems, mobile parts are often directly deposited and charged in a charging shell of the base station. Since the distance between the 2 0 antenna of the mobile part and the antenna of the base part often amounts to only a few cm, and since this distance, on the other hand, aunounts to 50 through 200 m at the limit of the cell, it is clear that high dynamic demands are made of the receiver in order to assure a faultless function in both limit cases. Meeting these demands, of course, leads to higher costs.
2 5 GB-2 29fi 628 A discloses a method for the synchronization of a mobile part of a mobile radiotelephone system working according to a multiplex method, whereby at least one carrier having a specific power is beamed out by various base stations, a.nd whereby the mobile part seeks a carrier until synchronization with the base station has been achieved, whereby the mobile part constantly determines a 3 0 measured value for the reception field strength.
MAR-20-00 12:56 3128760898 P.15 R-654 Job-122 03/20/00 MON 12:02 FAX 3128760898 HILL LAW FIRM I~]015 Substitute Page 2a GB-2 293 947 A discloses a mobile radiotelephone system, whereby each mobile station measures the field strength of received pilot or, respectively, synchronization signals of base stations and informs the base stations of the measured values. The base stations in torn measure the distance between the base station and the mobile station on the basis of the intensity field strengths sent from the mobile station to the base station, select a specific time slot pair from the plurality of time slot pairs with reference to the measured distance, and allocate the selected time slot pair to the mobile station.
1.0 US-5,528,623 discloses a cordless telephone system with an automatic control of the transmission power and transmission frequency, whereby the automatic control of the transmission power and of the transmission frequency ensues dependent on changed transmission conditions and is based on indicators about the quality of a communication connection between the remote mobile parts and the base station.
EP-0 682 417 A2 discloses a method for controlling the transmission power in a "spread spectrum" communication system, whereby the transmission power is determined dependent on the tra.asmission power sent with a control bit.
An object of the invention is to create a method that enables the use of receivers in mobile parts that work with less of a dynamic range in the radio-frequency 2 0 part and that are therefore less expensive.
This object is achieved with a method of the species initially cited wherein, inventively, the mobile part sends a request to the base station when a MAR-20-00 12:56 3128760898 P.04 R-654 Job-122 03/20/00 MON 11:58 FAX 3128760898 HILL LAW FIRM I~J004 prescribable field strength measured value is exceeded, and, following thereupon, the base station sends another dummy bearer of reduced power on a different channel.
For the implementation of this method, the software usually present in the mobile parts and base stations can be co-employed. Additional hardware is not required at all, so that the desired cost advantage can in fact be achieved.
In order to avoid or, respectively, to shorten search times, it is expedient when the channel on which the dummy bearer of reduced power is sent is determined by information exchange between mobile part and base station.
A simple solution is thereby comprised therein that the mobile part, together with the request, uses a message to reveal a new channel for the further dummy bearer of reduced power.
On the other hand, it is likewise possible that, after receiving the request, the base station defines a channel for the further dummy bearer and announces this channel with a message to the mobile part.
The method of the invention is particularly suited for a mobile radio telephone system that works according to a FDMA/TDMA method, particularly m the DECT standard.
A mobile radio telephone system of the aforementioned species is also suitable for achieving the object wherein, inventively, the mobile part is configured for 2 0 comparing the field strength measured value to a prescribable maximum value as well as for transmitting a request when the maximum value is exceeded, and the base station, after reception of the request, is configured for transmitting a further dummy bearer of reduced power on a different channel. As a result thereof, the advantages already cited in conjunction with the method derive.
2 5 In order to shorten search times, a development of the invention is characterized in that this is configured for determining the channel on which the first dummy bearer of reduced frequency is transmitted by information exchange between mobile part and base station.
MAR-20-00 12:56 3128160898 P.05 R-654 Job-122 03/20/00 MON 11:58 FAX 3128760898 HILL LAW FIRM _ ~ 005 It can thereby be advantageously provided that the mobile part is configured for revealing - together with the request - a new channel for the further dummy bearer of reduced power with a message, or that the base station is configured - ai~er receiving the request - for determining a channel for the further dummy bearer and informing the mobile part of this channel with a message.
The advantages of the invention particularly take effect given a mobile radio telephone system that is a FDMAJTDMA system, particularly a DECT system.
The invention, together with further advantage thereof, is explained in greater detail below with reference to an exemplary embodiment that is illustrated in the drawing. Shown therein are:
Figures la and lb a schematic base station that transmits dummy bearers, with two mobile parts;
Figure 2 a block circuit diagram of a mobile part o~ an inventive mobile radio telephone system; and Figures 3a and 3b the inventive method on the basis of flowcharts.
According to Figures 1 a and lb, a base station FP is provided that emits a dummy bearer DB 1 on, for example, a channel Ke. In the DECT system, which is a FDMA/TDMA system, this dummy bearer is beamed out on one of 10 frequencies and in one of 12 time slots therein; however, the invention is not limited to this system.
2 0 After searching for a suitable base station, let the mobile part PP 1 have found such a base station and be synchronized to the dummy bearer DB 1 on the channel Ka. Further conditions for such a synchronization such as the (partial) coincidence with an identification and the presence of a minimum field strength shall not be explained in greater detail here siace they are not critical to the invention.
2 5 According to Figure 1 a, two mobile parts PP 1 and PP2 are located at a greater distance from the base station FP, which, given a cordless telephone can, for example, mean 10 or 20 m. When the mobile part PP1 is then brought to the base station FP, particularly in order to be deposited in a charging shell thereat and in order MAR-20-00 12:56 3128760898 P.06 R-654 Job-122 03/20/00 MON 11:59 FAX 3128760898 HILL LAW FIRM ~ 006 to be charged, then the reception field strength increases greatly as the antenna of the mobile part approaches the antenna of th.e base station. This is felt in DECT
system, for example, on the basis of a rise in the RS SI value (radio signal strength indicator), and the mobile part sends a request REQ (see Figure 3a) to the base station RP
as 5 soon as this value exceeds a certain maximum value RSSIn,~ and, simultaneously or following thereafter, outputs a message CHA in accord wherewith a new dummy bearer is desired on a different channel with reduced power. Let the fundamental structure of a mobile part PPl be briefly discussed with reference to Figure 2, this containing a RF part HFT with an antenna ANT and, potentially, a frequency synthesizer S 1N, also containing a burst mode controller BMC, a micro controller MCR and a digital signal processor DSP for processing, for example, voice and other data. However, a software processor can also be contained in the micro controller in terms of software, nor need a synthesizer be necessarily present; rather, what is critical is a base band processing. Generally, a microphone MIC and an earphone LSP or loudspeaker is also provided. The data traffic within the mobile part essentially proceeds via a bus BUS, and the micro controller - in the present case -contains, for example a time slot memory SSB and a frequency memory FMP as well as a frequency scan FSC and a time slot scan SSC for its search mechanisms. A comparator VER
is provided for comparing the RSSI value to a maximum value RSSIm~, this being 2 0 symbolically shown here; in fact, however, a software-processing of the corresponding signals ensues. Further details such as, far example a power supply unit, a keyboard and a display, etc., that are at the command of a person skilled in the art are not shown.
After receiving the aforementioned message and request, the base station 2 5 then transmits a further dummy bearer DB2 on the channel Kb in addition to the dummy bearer DB 1 on the channel K" whereby the power P2 of the additional dummy bearer can be and should be substantially less than the power of the dummy bearer DB 1. The mobile part can now switch from the dummy bearer DB 1 onto the dummy bearer DB2 and can synchronize to this as Long as it is close to the base station or, MAR-20-00 12:56 3128760898 P.07 R-654 Job-122 03/20/00 MON 11:59 FAX 3128760898 HILL LAW FIRM ff1007 respectively, is located in the charging cell. Given a subsequent, greater distance from the base station, the synchronization on the dummy bearer DB2 is lost due to the lower field strength, and the mobile part can then re-synchronize to the dummy hearer DB 1 or to some other dummy bearer either with a systematic search or designationally.
Given the version shown in Figure 3b, only a request REQ to the base station for a further dummy bearer ensues when a maximum RSSI value is reached or, respectively, exceeded. The base station can now seek an available channel for the dummy bearer, for example the channel Kb here, and can send a message CCH to the mobile part, in accord wherewith the latter should change to the new channel fb [sic].
In this message as well as in other messages, an acknowledgment can be provided, whereupon the base station - just like in the example of Figure 2a - sends a dummy bearer DB2 on the channel Kb - sends a dummy bearer DB2 on the channel K,, in addition to the dummy bearer DB 1 on the channel K" and the power P2 of the additional dummy bearer here is again lower than that P 1 of the original dummy I5 bearer. The mobile part PP 1 now synchronizes to the dummy bearer DB2 on the channel FP [sic], at least as long as it is located in the immediate proximity of the base station. As outlined in Figure lb, a further mobile part PP2, by contrast, can be synchronized onto the dummy bearer DB 1 on the channel Ka.
MULTIPLEX-OPERATED MOBILE RADIOTELEPHONE SYSTEM
The invention is directed to a method for synchronizing a mobile part of a mobile radio telephone system working according to a multiplex method, whereby at least one dummy bearer having a specific power is transmitted from a base station and a dummy bearer is sought on the part of the mobile part until synchronization with the base station is achieved, whereby the mobile part constantly determines a measured value for the reception field strength.
Mobile radio telephone system that works according to a multiplex method, having at least one base station and at least one mobile part, whereby the base station is configured for transmitting at least one dummy bearer in a channel from a plurality of channels, and whereby each mobile part comprises a ItF part, a burst mode controller and a micro controller and is configured for seeking a dummy bearer with a suitable identity until it has synchronized to this dummy bearer. [sic]
The following description refers mainly to a DECT cordless telephone system; however, the invention can be equally employed to other mobile radio telephone systems that comprise the features assumed here.
The DECT system is a frequency division multiple access/time division multiple access system (FDMA/TDMA) with time division duplex (TDD) in a Pico-2 0 cellular structure, whereby the frequency band available is divided into 10 carrier frequence according to the standard currently in force. Each of these carriers offers 24 time slots, namely 12 for the radio path base station-mobile part and 12 for the radio path mobile part-base station. Further details about the DECT systexn are compiled in the article , "Struktur des DECT-Standards", U. Pilger, Nachrichtentech., Elektron., Berlin 42 (1992) 1, pages 23 through 29. Further details can be found in DECT-related ETS1 Standards, published by the European Telecommunications Standards Institute. The content of these recommendations is assumed to be known by a person skilled in the art.
MAR-20-00 12:56 3128760898 P.14 R-654 Job-122 03/20/00 MON 12:01 FAX 3128760898 HILL LAW FIRM f~014 Substitute Page After a mobile part is turned on, this must fast seek a synchronization with a base station. For this purpose, each base station transmits what is referred to as a dummy bearer that is composed of the date of a time slot, whereby, however, data are not yet transmitted in the B-field, the principal part of the data field (D-field). For seeking a dummy bearer, the mobile part in the prior art cyclically searches for a base station in the entire frequency band that must comprise a suitable identity (radio fixed part identification). Given a plurality of suitable base stations, that having the highest field strength is selected, this ensuing on the basis of what is referred to as the RS SI
value (radio signal strength indicator). The control of the search ensues via the burst mode controller that looks for even-numbered time slots on a first frequency for a specific time, for example 40 ms in what is referred to as "slow hopping", and then searches for base stations on odd-numbered time slots. In contrast thereto, the sweep is sequential in "fast hopping". The next frequency is then set and another search is carried out, first for even-numbered and then odd-numbered time slots, etc.
If, after sweeping all 10 frequencies, no basic [sic] was found, various algorithms can be activated, in accord wherewith the search procedure is repeated at certain time intervals that also potentially become longer and longer.
Given cordless telephone systems, mobile parts are often directly deposited and charged in a charging shell of the base station. Since the distance between the 2 0 antenna of the mobile part and the antenna of the base part often amounts to only a few cm, and since this distance, on the other hand, aunounts to 50 through 200 m at the limit of the cell, it is clear that high dynamic demands are made of the receiver in order to assure a faultless function in both limit cases. Meeting these demands, of course, leads to higher costs.
2 5 GB-2 29fi 628 A discloses a method for the synchronization of a mobile part of a mobile radiotelephone system working according to a multiplex method, whereby at least one carrier having a specific power is beamed out by various base stations, a.nd whereby the mobile part seeks a carrier until synchronization with the base station has been achieved, whereby the mobile part constantly determines a 3 0 measured value for the reception field strength.
MAR-20-00 12:56 3128760898 P.15 R-654 Job-122 03/20/00 MON 12:02 FAX 3128760898 HILL LAW FIRM I~]015 Substitute Page 2a GB-2 293 947 A discloses a mobile radiotelephone system, whereby each mobile station measures the field strength of received pilot or, respectively, synchronization signals of base stations and informs the base stations of the measured values. The base stations in torn measure the distance between the base station and the mobile station on the basis of the intensity field strengths sent from the mobile station to the base station, select a specific time slot pair from the plurality of time slot pairs with reference to the measured distance, and allocate the selected time slot pair to the mobile station.
1.0 US-5,528,623 discloses a cordless telephone system with an automatic control of the transmission power and transmission frequency, whereby the automatic control of the transmission power and of the transmission frequency ensues dependent on changed transmission conditions and is based on indicators about the quality of a communication connection between the remote mobile parts and the base station.
EP-0 682 417 A2 discloses a method for controlling the transmission power in a "spread spectrum" communication system, whereby the transmission power is determined dependent on the tra.asmission power sent with a control bit.
An object of the invention is to create a method that enables the use of receivers in mobile parts that work with less of a dynamic range in the radio-frequency 2 0 part and that are therefore less expensive.
This object is achieved with a method of the species initially cited wherein, inventively, the mobile part sends a request to the base station when a MAR-20-00 12:56 3128760898 P.04 R-654 Job-122 03/20/00 MON 11:58 FAX 3128760898 HILL LAW FIRM I~J004 prescribable field strength measured value is exceeded, and, following thereupon, the base station sends another dummy bearer of reduced power on a different channel.
For the implementation of this method, the software usually present in the mobile parts and base stations can be co-employed. Additional hardware is not required at all, so that the desired cost advantage can in fact be achieved.
In order to avoid or, respectively, to shorten search times, it is expedient when the channel on which the dummy bearer of reduced power is sent is determined by information exchange between mobile part and base station.
A simple solution is thereby comprised therein that the mobile part, together with the request, uses a message to reveal a new channel for the further dummy bearer of reduced power.
On the other hand, it is likewise possible that, after receiving the request, the base station defines a channel for the further dummy bearer and announces this channel with a message to the mobile part.
The method of the invention is particularly suited for a mobile radio telephone system that works according to a FDMA/TDMA method, particularly m the DECT standard.
A mobile radio telephone system of the aforementioned species is also suitable for achieving the object wherein, inventively, the mobile part is configured for 2 0 comparing the field strength measured value to a prescribable maximum value as well as for transmitting a request when the maximum value is exceeded, and the base station, after reception of the request, is configured for transmitting a further dummy bearer of reduced power on a different channel. As a result thereof, the advantages already cited in conjunction with the method derive.
2 5 In order to shorten search times, a development of the invention is characterized in that this is configured for determining the channel on which the first dummy bearer of reduced frequency is transmitted by information exchange between mobile part and base station.
MAR-20-00 12:56 3128160898 P.05 R-654 Job-122 03/20/00 MON 11:58 FAX 3128760898 HILL LAW FIRM _ ~ 005 It can thereby be advantageously provided that the mobile part is configured for revealing - together with the request - a new channel for the further dummy bearer of reduced power with a message, or that the base station is configured - ai~er receiving the request - for determining a channel for the further dummy bearer and informing the mobile part of this channel with a message.
The advantages of the invention particularly take effect given a mobile radio telephone system that is a FDMAJTDMA system, particularly a DECT system.
The invention, together with further advantage thereof, is explained in greater detail below with reference to an exemplary embodiment that is illustrated in the drawing. Shown therein are:
Figures la and lb a schematic base station that transmits dummy bearers, with two mobile parts;
Figure 2 a block circuit diagram of a mobile part o~ an inventive mobile radio telephone system; and Figures 3a and 3b the inventive method on the basis of flowcharts.
According to Figures 1 a and lb, a base station FP is provided that emits a dummy bearer DB 1 on, for example, a channel Ke. In the DECT system, which is a FDMA/TDMA system, this dummy bearer is beamed out on one of 10 frequencies and in one of 12 time slots therein; however, the invention is not limited to this system.
2 0 After searching for a suitable base station, let the mobile part PP 1 have found such a base station and be synchronized to the dummy bearer DB 1 on the channel Ka. Further conditions for such a synchronization such as the (partial) coincidence with an identification and the presence of a minimum field strength shall not be explained in greater detail here siace they are not critical to the invention.
2 5 According to Figure 1 a, two mobile parts PP 1 and PP2 are located at a greater distance from the base station FP, which, given a cordless telephone can, for example, mean 10 or 20 m. When the mobile part PP1 is then brought to the base station FP, particularly in order to be deposited in a charging shell thereat and in order MAR-20-00 12:56 3128760898 P.06 R-654 Job-122 03/20/00 MON 11:59 FAX 3128760898 HILL LAW FIRM ~ 006 to be charged, then the reception field strength increases greatly as the antenna of the mobile part approaches the antenna of th.e base station. This is felt in DECT
system, for example, on the basis of a rise in the RS SI value (radio signal strength indicator), and the mobile part sends a request REQ (see Figure 3a) to the base station RP
as 5 soon as this value exceeds a certain maximum value RSSIn,~ and, simultaneously or following thereafter, outputs a message CHA in accord wherewith a new dummy bearer is desired on a different channel with reduced power. Let the fundamental structure of a mobile part PPl be briefly discussed with reference to Figure 2, this containing a RF part HFT with an antenna ANT and, potentially, a frequency synthesizer S 1N, also containing a burst mode controller BMC, a micro controller MCR and a digital signal processor DSP for processing, for example, voice and other data. However, a software processor can also be contained in the micro controller in terms of software, nor need a synthesizer be necessarily present; rather, what is critical is a base band processing. Generally, a microphone MIC and an earphone LSP or loudspeaker is also provided. The data traffic within the mobile part essentially proceeds via a bus BUS, and the micro controller - in the present case -contains, for example a time slot memory SSB and a frequency memory FMP as well as a frequency scan FSC and a time slot scan SSC for its search mechanisms. A comparator VER
is provided for comparing the RSSI value to a maximum value RSSIm~, this being 2 0 symbolically shown here; in fact, however, a software-processing of the corresponding signals ensues. Further details such as, far example a power supply unit, a keyboard and a display, etc., that are at the command of a person skilled in the art are not shown.
After receiving the aforementioned message and request, the base station 2 5 then transmits a further dummy bearer DB2 on the channel Kb in addition to the dummy bearer DB 1 on the channel K" whereby the power P2 of the additional dummy bearer can be and should be substantially less than the power of the dummy bearer DB 1. The mobile part can now switch from the dummy bearer DB 1 onto the dummy bearer DB2 and can synchronize to this as Long as it is close to the base station or, MAR-20-00 12:56 3128760898 P.07 R-654 Job-122 03/20/00 MON 11:59 FAX 3128760898 HILL LAW FIRM ff1007 respectively, is located in the charging cell. Given a subsequent, greater distance from the base station, the synchronization on the dummy bearer DB2 is lost due to the lower field strength, and the mobile part can then re-synchronize to the dummy hearer DB 1 or to some other dummy bearer either with a systematic search or designationally.
Given the version shown in Figure 3b, only a request REQ to the base station for a further dummy bearer ensues when a maximum RSSI value is reached or, respectively, exceeded. The base station can now seek an available channel for the dummy bearer, for example the channel Kb here, and can send a message CCH to the mobile part, in accord wherewith the latter should change to the new channel fb [sic].
In this message as well as in other messages, an acknowledgment can be provided, whereupon the base station - just like in the example of Figure 2a - sends a dummy bearer DB2 on the channel Kb - sends a dummy bearer DB2 on the channel K,, in addition to the dummy bearer DB 1 on the channel K" and the power P2 of the additional dummy bearer here is again lower than that P 1 of the original dummy I5 bearer. The mobile part PP 1 now synchronizes to the dummy bearer DB2 on the channel FP [sic], at least as long as it is located in the immediate proximity of the base station. As outlined in Figure lb, a further mobile part PP2, by contrast, can be synchronized onto the dummy bearer DB 1 on the channel Ka.
Claims (10)
1. Method for synchronizing a mobile part (PP1) of a mobile radio telephone system working according to a multiplex method, whereby at least one dummy bearer (DB1) having a specific power (P1) is emitted by a base station (FP) and the mobile part (PP1) searches for a dummy bearer (DB1) until synchronization with the base station is achieved, whereby the mobile part constantly determines a measured value (RSSI) for the reception field strength, characterized in that, given upper transgression of a prescribable field strength measured value (RSSI max), the mobile part (PP1) sends a request (REQ) to the base station (FP), and, in response thereto, the base station (FP) emits a further dummy bearer (DB2) of reduced power (P2) on a different channel (K b).
2. Method according to claim 1, characterized in that the channel on which the further dummy bearer (DB2) of reduced power is sent is determined by information exchange between mobile part (PP) and base station (FP).
3. Method according to claim 2, characterized in that the mobile part (PP1) - together with the request (REQ) - announces a new channel (K b) for the further dummy bearer (DB2) of reduced power (P2) with a message (CHA).
4. Method according to claim 2, characterized in that the base station (FP) - after receiving the request (REQ) - determines a channel (K b) for the further dummy bearer (DB), and announces this channel to the mobile part (PP1) with a message (CCH).
5. Method according to one of the claims 1 through 4, whereby the mobile radio telephone system works according to a FDMA/TDMA method, particularly in the DECT standard.
6. Mobile radio telephone system that works according to a multiplex method, having at least one base station (FP) and at least one mobile part (PP1, PP2), wherein the base station is configured for transmitting at least one dummy bearer in a channel from a plurality of channels, and whereby each mobile part (PP1) comprises a RF part (HFT), a burst mode controller (BMC) and a micro controller (MCR) and is configured for seeking a dummy bearer (DB) having a suitable identity until it has been synchronized to this dummy bearer, characterized in that the mobile part (PP1) is configured for comparing the field strength measured value (RSSI) to a prescribable maximum value (RSSI max) as well as for emitting a request (REQ) given upper transgression of the maximum value; and the base station (FP) - after receiving the request (REQ) - is configured for transmitting a further dummy bearer (DB2) of reduced power (P2) on a different channel (K b).
7. Mobile radio telephone system according to claim 6, characterized in that said system is configured for determining the channel on which the further dummy bearer (DB2) of reduced frequency is transmitted by information exchange between mobile part (PP1) and base station (FP).
8. Mobile radio telephone system according to claim 6, characterized in that the mobile (PP1) is configured for announcing a new channel (K b) for the further dummy bearer (DB2) of reduced power with a message (CHA) together with the request (REQ).
9. Mobile radio telephone system according to claim 6, characterized in that the base station (FP) is configured - after receiving the request (REQ) - to determine a channel (K b) for the further dummy bearer (DB2) and to inform the mobile part (PP1) of this channel with a message (CCH).
10. Mobile radio telephone system according to one of the claims 6 through 8, characterized in that said system is a FDMA/TDMA system, particularly a DECT
system.
system.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742182.2 | 1997-09-24 | ||
| DE19742182A DE19742182C2 (en) | 1997-09-24 | 1997-09-24 | Method for synchronizing a mobile part of a mobile radio system operating according to a multiplex method |
| PCT/DE1998/002720 WO1999016184A1 (en) | 1997-09-24 | 1998-09-14 | Method for synchronizing a mobile component of a multiplex-operated mobile radiotelephone system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2304654A1 true CA2304654A1 (en) | 1999-04-01 |
Family
ID=7843493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002304654A Abandoned CA2304654A1 (en) | 1997-09-24 | 1998-09-14 | Method for synchronizing a mobile component of a multiplex-operated mobile radiotelephone system |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1018227B1 (en) |
| CA (1) | CA2304654A1 (en) |
| DE (2) | DE19742182C2 (en) |
| ES (1) | ES2160421T3 (en) |
| WO (1) | WO1999016184A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8295874B2 (en) | 2009-06-10 | 2012-10-23 | Motorola Mobility Llc | Femto-cell power control using idle-mode user equipment in a cellular communication system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10160493B4 (en) * | 2001-12-08 | 2014-07-10 | Harman Becker Automotive Systems Gmbh | Method and arrangement for synchronizing a data source and a data sink |
| WO2006049460A1 (en) * | 2004-11-04 | 2006-05-11 | Samsung Electronics Co., Ltd. | Apparatus and method for signal transmission and reception using downlink channel information in a sleep mode in a bwa communication system |
| DE102010001358B4 (en) * | 2010-01-29 | 2015-06-18 | Lantiq Deutschland Gmbh | Methods and apparatus for data transmission |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3302168B2 (en) * | 1994-04-05 | 2002-07-15 | 株式会社東芝 | Mobile radio communication system |
| JP2980156B2 (en) * | 1994-05-12 | 1999-11-22 | エヌ・ティ・ティ移動通信網株式会社 | Transmission power control method and spread spectrum communication apparatus using the control method |
| US5528623A (en) * | 1994-10-26 | 1996-06-18 | American Wireless Corporation | Cordless telephone system having automatic control of transmitter power and frequency in response to changing conditions |
| JP2647038B2 (en) * | 1994-12-21 | 1997-08-27 | 日本電気株式会社 | Mobile communication system and line control method therefor |
-
1997
- 1997-09-24 DE DE19742182A patent/DE19742182C2/en not_active Expired - Fee Related
-
1998
- 1998-09-14 CA CA002304654A patent/CA2304654A1/en not_active Abandoned
- 1998-09-14 ES ES98955322T patent/ES2160421T3/en not_active Expired - Lifetime
- 1998-09-14 WO PCT/DE1998/002720 patent/WO1999016184A1/en active IP Right Grant
- 1998-09-14 EP EP98955322A patent/EP1018227B1/en not_active Expired - Lifetime
- 1998-09-14 DE DE59800945T patent/DE59800945D1/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8295874B2 (en) | 2009-06-10 | 2012-10-23 | Motorola Mobility Llc | Femto-cell power control using idle-mode user equipment in a cellular communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2160421T3 (en) | 2001-11-01 |
| DE19742182A1 (en) | 1999-03-25 |
| EP1018227B1 (en) | 2001-06-27 |
| WO1999016184A1 (en) | 1999-04-01 |
| DE59800945D1 (en) | 2001-08-02 |
| DE19742182C2 (en) | 2000-05-11 |
| EP1018227A1 (en) | 2000-07-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |