Source: http://www.google.com/patents/US6400949?dq=6650327
Timestamp: 2014-03-12 09:07:33
Document Index: 15855570

Matched Legal Cases: ['art: 1', 'art 1', 'art 2', 'art 3', 'art 4', 'art 5', 'art 6', 'art 7', 'art 8', 'art 9', 'art 1', 'art 2', 'art 3', 'art 4', 'art 5', 'art 6', 'art 7', 'art 8', 'art 9']

Patent US6400949 - Process for establishing telecommunication connections between ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsIn order to set up telecommunication connections more quickly between a DECT fixed part and a DECT mobile part (portable part) of a DECT system, if no items of �blind slot� information relating to the telecommunication connections to be set up are present, and to increase the probability that a connection...http://www.google.com/patents/US6400949?utm_source=gb-gplus-sharePatent US6400949 - Process for establishing telecommunication connections between telecommunication apparatuses in wireless telecommunication systems, in particular between DECT-apparatuses of a DECT-systemAdvanced Patent SearchPublication numberUS6400949 B1Publication typeGrantApplication numberUS 09/230,493PCT numberPCT/DE1997/001648Publication dateJun 4, 2002Filing dateAug 5, 1997Priority dateAug 9, 1996Fee statusLapsedAlso published asCA2262568A1, CN1227684A, DE19632261A1, DE19632261C2, EP0947059A2, EP0947059B1, WO1998007245A2, WO1998007245A3Publication number09230493, 230493, PCT/1997/1648, PCT/DE/1997/001648, PCT/DE/1997/01648, PCT/DE/97/001648, PCT/DE/97/01648, PCT/DE1997/001648, PCT/DE1997/01648, PCT/DE1997001648, PCT/DE199701648, PCT/DE97/001648, PCT/DE97/01648, PCT/DE97001648, PCT/DE9701648, US 6400949 B1, US 6400949B1, US-B1-6400949, US6400949 B1, US6400949B1InventorsLudger Bielefeld, Christoph LenfortOriginal AssigneeSiemens AktiengesellschaftExport CitationBiBTeX, EndNote, RefManPatent Citations (8), Non-Patent Citations (23), Referenced by (8), Classifications (13), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetProcess for establishing telecommunication connections between telecommunication apparatuses in wireless telecommunication systems, in particular between DECT-apparatuses of a DECT-systemUS 6400949 B1Abstract In order to set up telecommunication connections more quickly between a DECT fixed part and a DECT mobile part (portable part) of a DECT system, if no items of �blind slot� information relating to the telecommunication connections to be set up are present, and to increase the probability that a connection setup takes place given these conditions, the DECT radio channels used in failed attempts at setting up the telecommunication connections are marked, at least temporarily, as unusable radio channels for further connection setup attempts.
7. The method according to claim 6, wherein the items of additional information (BSI, BCI) are DECT/GAP-specific items of �blind slot� information.
3) the message transmission takes place in wireless fashion on the basis of various message transmission methods FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access) and/or CDMA (Code Division Multiple Access)�e.g. according to radio standards such as DECT, GSM, WACS or PACS, IS-54, PHS, PDC, etc. [cf. IEEE Communications Magazine, January 1995, pages 50 to 57; D. D. Falconer et al.: �Time Division Multiple Access Methods for Wireless Personal Communications�] and/or in wire-bound fashion.
�Message� is a higher-order concept that stands both for the meaning content (information) and for the physical representation (signal). Despite identical meaning content of a message�i.e., identical information�different signal forms can occur. Thus, for example a message relating to a single subject matter can be transmitted in the following forms:
Telecommunication systems of the type defined above are for example DECT systems (Digital Enhanced (formerly: European) Cordless Telecommunication; cf. (1): Nachrichtentechnik Elektronik 42 (1992) Jan./Feb. no. 1, Berlin, DE; U. Pilger, �Struktur des DECT-Standards,� pp. 23 to 29, in connection with the ETSI publication ETS 300175-1 . . . 9, Oct. 1992; (2): Telcom Report 16 (1993), no. 1, J. H. Koch: �Digitaler Komfort f�r schnurlose Telekommunikation�DECT-Standard er�ffnet neue Nutzungsgebiete,� pp. 26 and 27; (3): tec 2/93�Das technische Magazin von Ascom �Wege zur universellen mobilen Telekommunikation,� pp. 35 to 42; (4): Philips Telecommunication Review, vol. 49, no. 3, Sep. 1991, R. J. Mulder: �DECT, a universal cordless access system�; (5): WO 93/21719 (FIGS. 1 to 3 with associated specification)) or GAP systems (Generic Access Profile; ETSI publication prETS 300444, April 1995, Final Draft, ETSI, FR), which can for example be constructed according to the representation in FIG. 1.
According to the DECT/GAP standard, according to the representation in FIG. 1 a maximum of 12 connections can be set up in parallel to DECT/GAP mobile parts MT1 . . . MT12 according to the TDMA/FDMA/TDD method (Time Division Multiple Access/Frequency Division Multiple Access/Time Division Duplex) via a DECT/GAP air interface designed for the frequency range between 1.88 and 1.90 GHz. The number 12 results from a number �k� of time slots or, respectively, telecommunication channels available for the duplex operation of a DECT/GAP system (k=12). The connections can thereby be internal and/or external. Given an internal connection, two mobile parts registered at the base station BS, e.g. the mobile part MT2 and the mobile part MT3, can communicate with one another. For the setup of an external connection, the base station BS is connected with a telecommunication network TKN, e.g. in wire-bound form via a telecommunication terminal unit TAE or, respectively, a private branch exchange NStA with a wire-bound telecommunication network or, according to WO 95/05040, in wireless form as a repeater station with a higher-level telecommunication network. Given the external connection, it is possible using a mobile part, e.g. the mobile part MT1, to communicate with a subscriber in the telecommunication network TKN via the base station BS, the telecommunication terminal unit TAE or, respectively, private branch exchange NStA. If�as in the case of the Gigaset 951 (Siemens cordless telephone; cf. telcom report 16, (1993), vol. 1, pages 26 and 27�the base station BS has only one terminal to the telecommunication terminal unit TAE or, respectively, to the private branch exchange NStA, only one external connection can be set up. If�as in the case of the Gigaset 952 (Siemens cordless telephone; cf. telcom report 16, (1993), vol. 1, pages 26 and 27�the base station has two terminals to the telecommunication network TKN, then in addition to the external connection with the mobile part MT1 a further external connection is possible from a wire-bound telecommunication terminal apparatus TKE connected to the base station BS. It is thereby also conceivable in principle that instead of the telecommunication terminal apparatus TKE a second mobile part, e.g. the mobile part MT12, uses the second terminal for an external connection. While the mobile parts MT1 . . . MT12 are operated with a battery or an accumulator, the base station, fashioned as a wireless small switching installation, is connected to a voltage network SPN via a network terminal apparatus NAG.
FIG. 2 shows, based on the reference Components 31 (1993), vol. 6, pp. 215 to 218; S. Althammer, D. Br�ckmann: �Hochoptimierte IC's f�r DECT-Schnurlostelefone,� the circuit design of the base station BS and of the mobile part MT. The base station BS and mobile part MT accordingly comprise a radio part FKT having an antenna ANT allocated for transmission and reception of radio signals, a signal processing means SVE and a central control unit ZST that are connected with one another in the manner shown. The radio part FKT essentially contains the known means such as transmitter SE, receiver EM and synthesizer SYN. In the signal processing means SVE, among other things there is a coding/decoding means CODEC. The central control unit ZST comprises, both for the base station BS and for the mobile part MT, a microprocessor μP with a program module PGM constructed according to the OSI/ISO layer model (cf. (1): Unterrichtsbl�tter�Deutsche Telekom, vol. 48, Febuary 1995, pp. 102 to 111; (2) ETSI publication ETS 300175-1 . . . 9, October 1992), a signal control part SST and a digital signal processor DSP that are connected with one another in the manner shown. Of the layers defined in the layer model, only the first four layers, immediately essential for the base station BS and the mobile part MT, are shown. The signal control part SST is fashioned in the base station BS as a time switch controller TSC and in the mobile part MT as a burst mode controller BMC. The essential difference between the two signal control parts TSC, BMC is that the base-station-specific signal control part TSC takes over additional switching functions in comparison with the mobile-part-specific signal control part BMC.
FIG. 3 shows, on the basis of the DECT system according to FIG. 1, a cellular DECT/GAP multisystem CMI (Cordless Multicell Integration), in which several of the above-described DECT/GAP systems TKS are present in concentrated fashion (in the sense of a �hot spot� arrangement), with a respective base station BS and one/several mobile part/s MT, at an arbitrary geographical location, e.g. in an administration building with spacious floor offices. However, instead of a �closed� geographical location, such as the management building, an �open� geographical location with strategic telecommunication significance, e.g. squares in large cities with high traffic volume, a large concentration of commercial units, and a large amount of movement of persons is possible for the installation of a cellular DECT/GAP multisystem CMI. A portion of the base stations BS arranged in the large-space office are thereby fashioned as antenna diversity base stations, in contrast to the base stations shown in FIGS. 1 and 2, according to WO 94/10764. The concentration of the DECT/GAP systems TKS is thereby so marked (gap-free radio coverage of the geographical location) that individual DECT/GAP systems TKS operate in the same environment through the overlapping cellular DECT/GAP radio areas FB.
According to the degree of overlap, �same environment� can thereby mean that
FIG. 4 shows, on the basis of the references �Nachrichtentechnik Elektronik, Berlin 45, (1995), vol. 1, pp. 21 to 23 and vol. 3, pp. 29 and 30,� as well as IEE Colloquium 1993, 173; (1993), pp. 29/1-29/7; W. Hing, F. Halsall: �Cordless access to the ISDN basic rate service,� on the basis of a DECT/ISDN Intermediate Systems DIIS according to the ETSI publication prETS 300xxx, version 1.10, September 1996, a �ISDN⇄DECT-specific RLL/WLL� Telecommunication System IDRW-TS (Integrated Services Digital Network⇄Radio in the Local Loop/Wireless in the Local Loop) with an ISDN Telecommunication Partial System I-TTS (cf. reference �Nachrichtentechnik Elektronik, Berlin 41-43, Part: 1 to 10, T1: (1991) vol. 3, pp. 99 to 102; T2: (1991) vol. 4, pp. 138 to 143; T3: (1991) vol. 5, pp. 179 to 182 and vol. 6, pp. 219 to 220; T4: (1991) vol. 6, pp. 220 to 222 and (1992) vol. 1, pp. 19 to 20; T5: (1992) vol. 2, pp. 59 to 62 and (1992) vol. 3, pp. 99 to 102; T6: (1992) vol. 4, pp. 150 to 153; T7: (1992) vol. 6, pp. 238 to 241; T8: (1993), vol. 1, pp. 29 to 33; T9: (1993) vol. 2, pp. 95 to 97 and (1993) vol. 3, pp. 129 to 135; T10: (1993) vol. 4, pp. 187 to 190;�) and a DECT-specific RLL/WLL Telecommunication Partial System RW-TTS.
The DECT/ISDN intermediate system DIIS or, respectively, the RLL/WLL telecommunication partial system RW-TTS can alternatively also be based on a GSM (Groupe Sp�ciale Mobile or Global System for Mobile Communication; cf. Informatik Spektrum 14 (1991) June, no. 3, Berlin, DE; A. Mann: �Der GSM-Standard �Grundlage f�r digitale europ�ische Mobilfunknetze,� pp. 137 to 152). Instead of this, in the context of a hybrid telecommunication system it is also possible for the ISDN telecommunication partial system I-TTS to be fashioned as a GSM system.
In the �ISDN⇄DECT-specific RLL/WLL� telecommunication system IDRW-TS according to FIG. 4, a telecommunication subscriber (user) TCU (TeleCommunication User) with his terminal apparatus TE (Terminal Endpoint; Terminal Equipment) is incorporated, e.g. via a standardized S-interface (S-BUS), the DECT/ISDN intermediate system DIIS (first telecommunication system), fashioned as a local message transmission loop (preferably DECT-specific and contained in the RLL/WLL telecommunication partial system RW-TTS), a further standardized S-interface (S-BUS), a network terminal NT (Network Termination) and a standardized U-interface of the ISDN telecommunication partial system I-TTS (second telecommunication partial system), into the ISDN world with the services available therein.
FIG. 5 shows, with reference to the publication �Nachrichtentechnik Elektronik 42 (1992) Jan./Feb., no. 1, Berlin, DE; U. Pilger: �Struktur des DECT-Standards,� pp. 23 to 29, in connection with ETS 300 175-1 . . . 9, October 1992,�the TDMA structure of the DECT/GAP system TKS. The DECT/GAP system is a hybrid system with respect to the multiple access methods, in which, according to the FDMA principle, transmission of radio messages according to the TDMA principle according to FIG. 5 can take place on ten frequencies in the frequency band between 1.88 and 1.9 GHz, in a predetermined chronological sequence from the base station BS to the mobile part MT and from the mobile part MT to the base station BS (Time Division Duplex operation). The chronological sequence is thereby determined by a multi-time slot MZR that occurs every 160 ms and that comprises 16 time slots ZR with a respective time duration of 10 ms. In these time slots ZR, items of information that relate to a C-, M-, N-, P-, Q-channel defined in the DECT standard are sent separately to the base station BS and the mobile part MT. If in a time slot ZR items of information for several of these channels are transmitted, the transmission takes place according to a priority list with M>C>N and P>N. Each of the 16 time slots ZR of the multi-time slot MZR is in turn divided into 24 time slots ZS with a respective time duration of 417 μs, of which 12 time slots ZS (time slots 0 . . . 11) are intended for the transmission direction �base station BS→mobile part MT� and a further 12 time slots ZS (time slots 12 . . . 23) are intended for the transmission direction �mobile part MT→base station BS.� In each of these time slots ZS, items of information are transmitted according to the DECT standard with a bit length of 480 bits. Of these 480 bits, 32 bits are transmitted as synchronization information in a SYNC field, and 388 bits are transmitted as useful information in a D-field. The remaining 60 bits are transmitted as additional items of information in a Z-field and as protective items of information in a field �guard time.� The 388 bits, transmitted as items of useful information, of the D-field are in turn divided into a 64-bit-long A-field, a 320-bit-long B-field and a 4-bit-long �X-CRC� word. The 64-bit-long A-field is composed of an 8-bit-long data head (header), a 40-bit-long data set with data for the C-, Q-, M-, N-, P-channels, and a 16-bit-long �A-CRC� word.
In addition, the items of system information contain additional items of information that inform the mobile part as to which TDMA time slots are available at the base station. This additional information is designated as �blind slot� information or �poor channel� information in the DECT standard (ETSI publication ETS 300175-3, October 1992, ch. 11.4.1, note 4) and in the GAP standard, which is a subset of the DECT standard and which has the task of ensuring the interoperability of the DECT air interface for telephone applications (cf. ETSI publication prETS 300444, April 1995, ch. 10.3.3). The transmission of the additional information rests on the blind slot effect that occurs in TDMA-specific telecommunication systems such as the DECT system. The blind slot effect occurs in particular when
b) base stations according to WO 94/10811 cannot send or receive in particular time slots, due to technical restrictions (e.g. DECT base stations with a �slow hopping� radio part).
If in the following the mobile part MT, RPP wishes to set up a telecommunication connection to the base station BS, RFP, it transmits a first message �ACCESS_REQUEST� to the base station BS, RFP as a SETUP request item of information, in one of the time slots ZS2n+1 that were communicated to it as being free, said transmission taking place according to the DECT standard (cf. ETSI publication ETS 300175-3, October 1992, ch. 10.5). After receiving this first message, the base station BS, RFP can for its part transmit further items of broadcast information BCI to the mobile part MT, RPP. The first message, sent by the mobile part MT,RPP, is responded to by the base station BS,RFP according to the DECT standard (cf. ETSI publication ETS 300175-3, October 1992, ch. 10.5) with a second message �BEARER_CONFIRM� (response information). After the transmission of the second message, according to the DECT standard further messages are exchanged between the base station BS, RFP and the mobile part MT, RPP, before the telecommunication connection desired by the mobile part MT with the base station BS, RFP is finally set up (Bearer Established).
Based on FIG. 6, FIG. 7 shows an event-state diagram for the setup of a telecommunication connection between a base station BS, RFP and a mobile part MT, RPP, without any additional information (�blind slot� information). In a time slot ZS2n, the base station BS, RFP sends an item of broadcast information BCI to the mobile part MT, RPP, without an additional item of information (blind slot information) BSI.
The mobile part MT, RPP, which in the following wishes to set up a telecommunication connection to the base station BS, RFP, again transmits, as an item of SETUP request information, the first message �ACCESS_REQUEST� to the base station BS, RFP (first attempt at a connection setup), according to the DECT standard (cf. ETSI publication ETS 300175-3, October 1992, ch. 10.5), this transmission taking place according to a time slot selected by means of the channel selection, e.g. on the basis of the disturbing signal level. In the present case, the time slot sought by the channel selection is however an odd time slot ZS2n+1, which is not available at the base station BS, RFP. However, alternatively it is also possible that the first message has not arrived at the base station BS, RFP, due to disturbances on the radio path. In both cases, the mobile part MT, RPP recognizes that the first attempt at setting up a connection to the base station BS, RFP has failed because it has not received the second message �BEARER_CONFIRM� from the base station BS, RFP, either intentionally (because the time slot used was an odd time slot) or unintentionally (because there was again a disturbance on the radio path).
Subsequently, the mobile part MT, RPP again transmits, according to the DECT standard (cf. ETSI publication ETS 300175-3, October 1992, ch. 10.5), the first message �ACCESS_REQUEST� to the base station BS, RFP (second attempt at a connection setup), after for example an item of broadcast information BCI has previously again been sent to the mobile part MT, RPP without an item of additional information (blind slot information) BSI, according to a time slot selected by the channel selection, e.g. on the basis of the disturbing signal level, which time slot can in some circumstances be the same as in the first attempt at a connection setup. This time slot sought by the channel selection is again also an odd time slot ZS2n+1 not available at the base station BS, RFP. However, alternatively it is also again possible that the first message has not arrived at the base station BS, RFP due to disturbances on the radio path. In both cases, the mobile part MT, RPP again recognizes that the second attempt at setting up a connection to the base station BS, RFP has likewise failed because it has not received the second message �BEARER_CONFIRM� from the base station BS, RFP, either intentionally (because the time slot used was an odd time slot) or unintentionally (because there was again a disturbance on the radio path).
However, according to the DECT standard it is provided to allow 10 attempts for a MAC layer construction (cf. ETSI publication ETS 300175-3, October 1992, ch. 10.2, in connection with annex A.2�Konstante N200) and 15 attempts for a bearer handover (cf. ETSI publication ETS 300175-3, October 1992, ch. 10.6, in connection with annex A.2�Konstante N202).
SUMMARY OF THE INVENTION The underlying object of the invention is on the one hand to set up telecommunication connections more quickly between first telecommunication apparatuses and second telecommunication apparatuses in wireless telecommunication systems, in particular between a DECT fixed part and a DECT mobile part (portable part) of a DECT system, if no items of additional information relating to the telecommunication connections to be set up are present, and on the other hand to increase the probability that a connection setup takes place at all given these conditions.
The items of additional information are DECT/GAP-specific items of �blind slot� information.
Items of additional information are DECT/GAP-specific items of �blind slot� information.
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 8 shows, on the basis of FIG. 7, an event-state diagram for the setting up of a telecommunication connection between a base station BS, RFP and a mobile part MTm, RPPm, modified in relation to the mobile part MT, RPP according to FIG. 7, without any additional information (blind slot information). In a time slot ZS2n, the base station BS, RFP transmits an item of broadcast information BCI to the mobile part MTm, RPPm without an additional item of information (blind slot information) BSI.
If in the following the mobile part MTm, RPPm wishes to set up a telecommunication connection to the base station BS, RFP, it transmits (as according to FIG. 7) the first message �ACCESS_REQUEST� as an item of SETUP request information to the base station BS, RFP (first attempt at a connection setup), according to a time slot selected by the channel selection, e.g. on the basis of the disturbing signal level, in accordance with the DECT standard (cf. ETSI publication ETS 300175-3, October 1992, ch. 10.5). In the present case, the time slot sought by the channel selection is however an odd time slot ZS2n+1, which is not available at the base station BS, RFP. Alternatively, it is again possible here as well that the first message did not arrive at the base station BS, RFP due to disturbances on the radio path. In both cases, the mobile part MTm, RPPm recognizes that the first attempt at setting up a connection to the base station BS, RFP has failed because it has not received the second message �BEARER_CONFIRM� from the base station BS, RFP, either intentionally (because the time slot used was an odd time slot) or unintentionally (because there was again a disturbance on the radio path).
Subsequently, the mobile part MTm, RPPm again transmits, according to the DECT standard (cf. ETSI publication ETS 300175-3, October 1992, ch. 10.5), the first message �ACCESS_REQUEST� to the base station BS, RFP (second attempt at a connection setup), after for example an item of broadcast information BCI has previously again been sent to the mobile part MTm, RPPm without an item of additional information (blind slot information) BSI, according to a time slot selected by the channel selection, e.g. on the basis of the disturbing signal level, which time slot can in some circumstances be the same as in the first attempt at a connection setup. This time slot sought by the channel selection is again also an odd time slot ZS2n+1 not available at the base station BS, RFP. However, alternatively it is also again possible that the first message has not arrived at the base station BS, RFP due to disturbances on the radio path. In both cases, the mobile part MTm, RPPm again recognizes that the second attempt at setting up a connection to the base station BS, RFP has likewise failed because it has not received the second message �BEARER_CONFIRM� from the base station BS, RFP, either intentionally (because the time slot used was an odd time slot) or unintentionally (because there was again a disturbance on the radio path).
The mobile part MTm, RPPm thereupon begins a third attempt. In the present case, this attempt is successful. This time, the mobile part MTm, RPPm has obtained an even time slot ZS2n that can be occupied (is free) for the setting up of telecommunication connections with the base station BS, RFP. However, the mobile part MTm, RPPm does not obtain certainty about this until it has received the second message �BEARER_CONFIRM.� Before the receipt of this message, the mobile part MTm, RPPm can (as shown in FIG. 8) receive for example another item of broadcast information BCI without an additional item of information.
(ii) has received the second message �BEARER_CONFIRM,� or
(iii) has respectively transmitted a predetermined number n of the first messages �ACCESS_REQUEST.�
Patent CitationsCited PatentFiling datePublication dateApplicantTitleDE4447243A1Dec 30, 1994Jul 4, 1996Siemens AgVerfahren zur Verbindungssteuerung in Kommunikationssystemen mit drahtloser Signal�bertragungEP0717578A2Nov 3, 1995Jun 19, 1996Siemens AktiengesellschaftMethod for linking subscriber stations to a mobile radio systemEP0722259A2Jan 9, 1996Jul 17, 1996Nokia Mobile Phones Ltd.Channel scanning method for portable radio telephonesGB2295944A Title not availableGB2297014A Title not availableWO1993021719A1Mar 25, 1993Oct 28, 1993Horst FlakeMethod of structuring a b-field format in a dect-standard systemWO1994010764A1Oct 12, 1993May 11, 1994Christoph EuscherMethod and installation for antenna-selection diversity in a wireless telephone receiverWO1995005040A1Aug 5, 1994Feb 16, 1995Pillekamp Klaus DieterUniversal mobile telecommunications systemNon-Patent CitationsReference1Components 31 (1993), No. 6, S. Althammer, D. Br�ckmann: Hochoptimierte IC's f�r DECT-Schnurlostelefone,pp. 215-218.2DECT/GAP standard (Digital European Cordless Telecommunication; cf. (1): Nachrichtentechnik Elekronik 42 (1992) Jan./Feb. No. 1, Berlin, DE; U. Pilger "Struktur des DECT-Standards," pp. 23-29.3ETSI-Publication prETS 300xxx, Version 1.10, Sep. (1996), pp. 1-117.4ETSI�Publication prETS 300xxx, Version 1.10, Sep. (1996), pp. 1-117.5ETSI-Publication, Apr. 1995, prETS 300444, Generic Access Profile, pp.1-129.6ETSI�Publication, Apr. 1995, prETS 300444, Generic Access Profile, pp.1-129.7ETSI-Publication, Oct. 1992, ETS 300175 1 . . . 9, Part 1: Overview, pp. 1-30; Part 2: Physical layer pp. 1-39; Part 3: Medium acces control layer, pp. 1-197; Part 4: Data link control layer, pp. 1-128; Part 5: Network layer, pp. 1-241; Part 6: Identities and addressing, pp. 1-41; Part 7: Security features, pp. 1-104; Part 8: Speech coding and transmission, pp. 1-39; Part 9: Public access profile, pp. 1-71.8ETSI�Publication, Oct. 1992, ETS 300175 1 . . . 9, Part 1: Overview, pp. 1-30; Part 2: Physical layer pp. 1-39; Part 3: Medium acces control layer, pp. 1-197; Part 4: Data link control layer, pp. 1-128; Part 5: Network layer, pp. 1-241; Part 6: Identities and addressing, pp. 1-41; Part 7: Security features, pp. 1-104; Part 8: Speech coding and transmission, pp. 1-39; Part 9: Public access profile, pp. 1-71.9IEE Colloquium 1993, 173; W. Hing et al, "Cordless Access to the ISDN Basic Rate Service", pp. 29/1-29/7.10IEEE Communications Magazine, Jan. 1995, David D. Falconer et al, Time Division Multiple Access Methods Personal Communications, pp. 50-57.11Informatik Spektrum 14, Jun. 1991, No. 3, Berlin, A. Mann, "Der GSM-Standard-Grundlage f�r dugutake europ�ische Mobilfunknetze", pp.137-152.12Informatik Spektrum 14, Jun. 1991, No. 3, Berlin, A. Mann, "Der GSM-Standard�Grundlage f�r dugutake europ�ische Mobilfunknetze", pp.137-152.13Nachrichtentec, Elektron, Berlin, vol. 45 (1995), Roland Geissler, Drahtlose ISDN-Kommunikation, pp. 21-23.14Nachrichtentech, Elektron, Berlin, vol. 41, (1991) Werner Baerwald, "Schnittstellen in der Tele-kommunikation Teil 1: Standardisierung in der Telekommunikation-ein �berlick", pp. 99-102; Teil 2: pp. 138-143; Teil 3: pp. 179-182; Teil 3 (Schluss): pp. 219-222; Teil 4: pp. 19-20; Teil 5: pp. 59-61; Teil 5 (Schluss): pp. 99-102; Teil 6: pp. 150-153; Teil 7: pp. 238-241; Teil 8: pp. 29-33; Teil 9: pp. 95-97; Teil 9: pp. 129-135; & Teil 10: pp. 187-190.15Nachrichtentech, Elektron, Berlin, vol. 41, (1991) Werner Baerwald, "Schnittstellen in der Tele-kommunikation Teil 1: Standardisierung in der Telekommunikation�ein �berlick", pp. 99-102; Teil 2: pp. 138-143; Teil 3: pp. 179-182; Teil 3 (Schluss): pp. 219-222; Teil 4: pp. 19-20; Teil 5: pp. 59-61; Teil 5 (Schluss): pp. 99-102; Teil 6: pp. 150-153; Teil 7: pp. 238-241; Teil 8: pp. 29-33; Teil 9: pp. 95-97; Teil 9: pp. 129-135; & Teil 10: pp. 187-190.16Nachrichtentech, Elektron, Berlin, vol. 45, (1995), Radio in the Local Loop, pp. 29-30.17Philips Telecommunication Review, R. J. Mulder, "DECT, a universal cordless access system", pp. 68-73.18tec 2/93-Das technische Magazin von Ascom "Wege zur universellen mobilen Telekommunikation", pp. 35 to 42.19tec 2/93�Das technische Magazin von Ascom "Wege zur universellen mobilen Telekommunikation", pp. 35 to 42.20Telcom Report 16 (1993), No. 1, J. H. Koch: "Digitaler Komfort f�r schnurlose Telekommunikation-DECT-Standard er�ffmet neue Nutzungsgebiete", pp. 26-27.21Telcom Report 16 (1993), No. 1, J. H. Koch: "Digitaler Komfort f�r schnurlose Telekommunikation�DECT-Standard er�ffmet neue Nutzungsgebiete", pp. 26-27.22Unterrichtsbl�tter-Deutsche Telekom Jg., 48 Feb.1995, Protokolle am Beispiel des OSI-Referenzmodells, pp. 102-111.23Unterrichtsbl�tter�Deutsche Telekom Jg., 48 Feb.1995, Protokolle am Beispiel des OSI-Referenzmodells, pp. 102-111.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS6625128 *Jun 28, 1999Sep 23, 2003Legerity, Inc.Method and apparatus for prioritizing packet data transmission and receptionUS6625443 *Aug 18, 1998Sep 23, 2003Siemens AktiengesellschaftMethod for the user-controlled release of wireless telecommunications connections in wireless telecommunications systems, especially DECT systemsUS6760586 *Sep 8, 2000Jul 6, 2004Lg Electronics Inc.System and method for processing a handover of digital enhanced cordless telecommunication (DECT) line cards in a switching systemUS6795410 *Jun 21, 1999Sep 21, 2004Trimble Navigation LimitedSlow hopping data transmitterUS6891816 *Jun 14, 2001May 10, 2005Intel CorporationSpread spectrum communication system using DECT protocolUS7120135 *Apr 9, 2001Oct 10, 2006Samsung Electronics Co., Ltd.Wire/wireless unified in-building communication method and systemUS7379981 *Jan 2, 2002May 27, 2008Kenneth W. GarrardWireless communication enabled meter and networkUS8502640Nov 21, 2008Aug 6, 2013Trilliant Networks, Inc.System and method for transmitting and receiving information on a neighborhood area network* Cited by examinerClassifications U.S. Classification455/434, 455/465International ClassificationH04W72/06Cooperative ClassificationH04W76/02, H04W28/04, H04W72/00, H04W72/06, H04L1/1607, H04W74/02, H04W48/08, H04M2250/08, H04W60/00European ClassificationH04W72/06Legal EventsDateCodeEventDescriptionAug 1, 2006FPExpired due to failure to pay maintenance feeEffective date: 20060604Jun 5, 2006LAPSLapse for failure to pay maintenance feesDec 21, 2005REMIMaintenance fee reminder mailedJan 22, 1999ASAssignmentOwner name: SIEMENS AKTIENGESELLSCHAFT, GERMANYFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BIELEFELD, LUDGER;LENFORT, CHRISTOPH;REEL/FRAME:010359/0420;SIGNING DATES FROM 19970807 TO 19970901RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google