Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W36/00—Hand-off or reselection arrangements
  • H04W36/16—Performing reselection for specific purposes
  • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Definitions

• Telecommunication systems with wireless telecommunication between mobile and / or stationary transceivers are special message systems with a message transmission link between a message source and a message sink, in which for example base stations and mobile parts for message processing and transmission are used as transceivers and in which 1) the message processing and message transmission can take place in a preferred transmission direction (simplex mode) or in both transmission directions (duplex mode), 2) the message processing is preferably digital, 3) the message transmission over the long-distance transmission path is wireless based on various Message transmission method for multiple use of the 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
• FDMA Frequency Division Multiple Access
• TDMA Time Division Multiple Access
• CDMA Code Division Multiple Access
• GSM Groupe Speciale Mobile or Global System for Mobile Communication; see. Informatik Spektrum 14 (1991) June, No. 3, Berlin, DE; A.Mann: "The GSM standard - the basis for digital European mobile radio networks", pages 137 to 152 in connection with the publication telekom praxis 4/1993, P. Smolka n GSM radio interface - elements and functions ", 2 pages 17 to 24],
• Baier "Sp ad-spectrum technology and CDMA - an originally military technology conquered the civilian sector”; (6): IEEE Personal Communications, February 1995, pages 48 to 53; PGAndermo, LM Ewerbring: "An CDMA-Based Radio Access Design for UMTS”; (7): ITG fraberichte 124 (1993), Berlin, Offenbach: VDE Verlag ISBN 3-8007-1965-7, pages 61 to 15; Dr. T.Zimmermann, Siemens AG: "Application of CDMA in mobile communication”; (8): telcom report 16, (1993), volume 1, pages 38 to 41; Dr. T. Ketseoglou, Siemens AG and Dr.
• the transmission according to (1) ... (3) is normally characterized by continuous (analog) signals, currency ⁇ rend in the transmission according to (4) is usually discontinuous signals (eg, pulses, digital signals) occur.
• FIGURES 1 to 7 show:
• FIGURE 1 "three-level structure" of a WCDMA / FDD air interface in the "downlink",
• FIGURE 2 "three-level structure" of a WCDMA / FDD air interface in the "uplink",
• FIGURE 3 "three-layer structure" steep a TDCDMA / TDD air interface ⁇
• FIGURE 4 radio scenario with multiple channel utilization after frequency, / time, / code multiplex
• FIG. 5 shows the basic structure of a base station designed as a transceiver
• FIG. 6 shows the basic structure of a mobile station which is also designed as a transceiver
• FIGURE 7 shows a DECT transmission time frame.
• the licensed coordinated mobile radio is based on WCDMA technology (Wideband Code Division Multiple Access) and, as with GSM, is operated in FDD mode (Frequency Division Duplex), while in a second sub-scenario the unlicensed uncoded ordinated mobile radio based on TD-CDMA technology (Time Division-Code Division Multiple Access) and, as with DECT, operated in TDD mode (Frequency Division Duplex).
• the air interface of the telecommunication system in the up and down direction of the telecommunication contains: " UTRA Physical Layer Descripti on FDD Parts "Vers. 0.
• the respective multi-time frame MZR contains, for example, 72 time frames ZR, while each time frame ZR, for example, again has 16 time slots ZS1 ... ZS16.
• the individual time slot ZS, ZS1 ... ZS16 (burst) has a pilot sequence PS with Npnot bits for channel estimation, a TPC sequence TPCS with N TPC bits for traffic control (Traffic Power Control). and a TFCI sequence TFCIS with N TFC ⁇ bits for the transport format information (Traffic Format Channel Indication) and with regard to the 5 second physical channel DPDCH a user data sequence NDS with N data bits.
• WCDMA / FDD Systems from ETSI or ARIB - FIGURE 1 the first physical channel ["Dedicated Physical Control Channel (DPCCH)] and the second physical channel [" Dedicated Physical Data Channel (DPDCH)] are time-multiplexed, while in the "uplink "(Upward direction of telecommunications; radio connection from the mobile station to the base station) - FIGURE 2 - an I / Q multiplex takes place, in which the second physical channel DPDCH is transmitted in the I channel and the first physical channel DPCCH in the Q channel.
• DPCCH Direct Physical Control Channel
• DPDCH Dedicated Physical Data Channel
• the air interface of the telecommunications system the document TSG RAN WG1 based in up and down direction of telecommunications according to (S1. 21): "3 rd Generation Partnership Project (3GPP) "Vers. 0. 0. 0. 1, 1999-01 again on the "three-level structure", consisting of the multi-time frame MZR, the time frame ZR and the time slots ZS, for all physical channels, which is shown in FIG. 3.
• the respective multi-time frame MZR again contains, for example, 72 time frames ZR, while each time frame ZR, for example, again has the 16 time slots ZS1 ... ZS16.
• ZS16 (burst) has either according impact ARIB forward a first time slot structure (burst structure) ZSS1 consisting frequency in the order of a first Nutzschulse- NDS1 with N Da tai bits, the pilot -Sequence PS with N P ii ot bits for channel estimation, the TPC sequence TPCS with N TPC bits for power control, the TFCI sequence TFCIS with N TFC ⁇ bits for specifying the transport format, a second user data sequence NDS2 and a guard time zone SZZ (guard period ) with N Gua rd bits, or according to the ETSI proposal, a second time slot structure (burst structure) ZSS2, in the order consisting of the first user data sequence NDS1, a first TFCI sequence 6 TFCIS1, a midamble sequence MIS for channel estimation, a second TFCI sequence TFCIS2, the second user data sequence NDS2 and the protection time zone SZZ.
• FIGURE 4 shows e.g. based on a GSM radio scenario with e.g. two radio cells and base stations arranged therein (base transceiver station), a first base station BTS1 (transceiver) a first radio cell FZ1 and a second base station BTS2 (transceiver) omnidirectionally "illuminating" a second radio cell FZ2, and starting from the FIGURES 1 and 2 show a radio scenario with multiple use of channels according to frequency / time / code multiplex, in which the base stations BTS1, BTS2 have an air interface designed for the radio scenario with a plurality of mobile stations MSI ... located in the radio cells FZ1, FZ2.
• MS5 transmitting / receiving device
• wireless unidirectional or bidirectional - upward direction UL (up link) and / or downward direction DL (down link) - telecommunication are connected or connectable to corresponding transmission channels TRC (transmission channel).
• the base stations BTS1, BTS2 are connected in a known manner (cf. GSM telecommunications system) to a base station controller BSC (BaseStation Controller) which takes over the frequency management and switching functions as part of the control of the base stations.
• the base station controller BSC in turn is via a mobile switching center MSC
• the mobile switching center MSC Mobile Switching Center with the higher-level telecommunications network, e.g. the PSTN (Public Switched Telecommunication Network).
• the mobile switching center MSC is the administrative center for the telecommunications system shown. It takes over the complete call management and, with associated registers (not shown), the authentication of the telecommunications subscribers and the location monitoring in the network.
• FIG. 5 shows the basic structure of the base station BTS1, BTS2 designed as a transceiver
• FIG. 6 shows the basic structure of the base station, also as a 7 / Receiving device trained mobile station MS1 ... MS5 shows.
• the base station BTS1, BTS2 takes over the sending and receiving of radio messages from and to the mobile station MS1..MS5, while the mobile station MS1 ... MS5 takes over the sending and receiving of radio messages from and to the base station BTS1, BTS2.
• the base station has a transmitting antenna SAN and a receiving antenna EAN
• the mobile station MS1 ... MS5 has an antenna ANT that can be controlled by an antenna switchover AU and is common for transmitting and receiving.
• the base station BTS1, BTS2 receives, for example, at least one radio message FN with a frequency / time / code component from at least one of the mobile stations MS1 ... MS5 via the receive antenna EAN, while the mobile station MS1 ... MS5 in the downward direction (reception path) receives, for example, at least one radio message FN with a frequency / time / code component from at least one base station BTS1, BTS2 via the common antenna ANT.
• the radio message FN consists of a broadband spread carrier signal with information modulated onto data symbols.
• the received carrier signal is filtered in a radio receiving device FEE (receiver) and mixed down to an intermediate frequency, which in turn is subsequently sampled and quantized.
• FEE radio receiving device
• the signal After an analog / digital conversion, the signal, which has been distorted on the radio path by multipath propagation, is fed to an equalizer EQL, which largely compensates for the distortions (Stw.: Synchronization).
• a channel estimator KS to estimate the transmission properties of the transmission channel TRC on which the radio message FN has been transmitted.
• the transmission properties of the channel are specified in the time domain by the channel impulse response. So that the channel impulse response can be estimated, the radio FN sends or assigns special information in the form of a so-called midambel on the transmission side (in the present case from the mobile station MS1 ... MS5 or the base station BTS1, BTS2), which is designed as a training information sequence.
• a subsequent data detector DD common to all received signals, the individual mobile station-specific signal components contained in the common signal are equalized and separated in a known manner. After equalization and separation, the previously existing data symbols are converted into binary data in a symbol-to-data converter SDW. The original bit stream is then obtained from the intermediate frequency in a demodulator DMOD before the individual time slots are assigned to the correct logical channels and thus also to the different mobile stations in a demultiplexer DMUX.
• the bit sequence obtained is decoded channel by channel in a channel codec KC.
• the bit information is assigned to the control and signaling time slot or a voice time slot and - in the case of the base station (FIGURE 5) - the control and signaling data and the voice data for transmission to the base station controller BSC together for signaling and voice coding / decoding (Voice codec) handover the responsible interface SS, while - in the case of the mobile station (FIGURE 6) - the control and signaling data of a control and signaling unit STSE responsible for complete signaling and control of the mobile station and the voice data one for voice input and - output speech codec SPC are passed.
• the speech data are stored in a predetermined data stream (for example 64 kbit / s stream in the network direction or 13 kbit / s stream from the network direction).
• a predetermined data stream for example 64 kbit / s stream in the network direction or 13 kbit / s stream from the network direction.
• the base station BTS1, BTS2 sends, for example, at least one radio message FN with a frequency / time / code component to at least one of the mobile stations MS1 ... MS5 via the transmitting antenna SAN, while the mobile station MS1 ... MS5 in the upward direction (transmission path) via the common antenna ANT, for example, sends at least one radio message FN with a frequency / time / code component to at least one base station BTS1, BTS2.
• the transmission path begins at the base station BTS1, BTS2 in
• FIGURE 5 with the fact that in the channel codec KC control and signaling data as well as voice data received from the base station controller BSC via the interface SS are assigned to a control and signaling time slot or a voice time slot and these are coded channel by channel into a bit sequence.
• the transmission path begins at the mobile station MS1 ... MS5 in FIGURE 6 with the fact that in the channel codec KC speech data received from the speech codec SPC and control and signaling data received from the control and signaling unit STSE a control and signaling time slot or are assigned to a speech time slot and these are coded channel-wise into a bit sequence.
• the bit sequence obtained in the base station BTS1, BTS2 and in the mobile station MS1 ... MS5 is in each case converted into data symbols in a data-to-symbol converter DSW. Subsequently, the data symbols are each in a spreading device SPE with a subscriber-specific one
• the burst generator BG consisting of a burst composer BZS and a multiplexer MUX
• BG consisting of a burst composer BZS and a multiplexer MUX
• FSE transmitter
• TDD Time Division Duplex
• a TDD telecommunication system which has such a transmission time frame is e.g. the well-known DECT system [Digital Enhanced (formerly: European) Cordless Telecommunication; see. Telecommunications Electronics 42 (1992) Jan. / Feb. No. 1, Berlin, DE; U. Pilger "Structure of the DECT standard", pages 23 to 29 in connection with the ETSI publication ETS 3001 15-1... 9, October 1992 and the DECT publication of the DECT Forum, February 1991, pages 1 to 16].
• DECT system Digital Enhanced (formerly: European) Cordless Telecommunication; see. Telecommunications Electronics 42 (1992) Jan. / Feb. No. 1, Berlin, DE; U. Pilger "Structure of the DECT standard", pages 23 to 29 in connection with the ETSI publication ETS 3001 15-1... 9, October 1992 and the DECT publication of the DECT Forum, February 1991, pages 1 to 16].
• FIGURE 7 shows a DECT transmission time frame with a duration of 10 ms, consisting of 12 "downlink , N time slots and 12" uplink w time slots.
• Time slot ZS D0WN and the "uplink" time slot ZS UP also 11 according to the DECT standard is half the length (5 ms) of the DECT transmission time frame.
• FDD (Frequency Division Duplex) telecommunication systems are telecommunication systems in which the time frame, consisting of several time slots, is transmitted in a first frequency band for the downlink direction and in a second frequency band for the uplink direction.
• An FDD telecommunications system that transmits the time frame in this way is, for example, the well-known GSM system [Groupe Speciale Mobile or Global System for Mobile Communication; see. Informatik Spektrum 14 (1991) June, No. 3, Berlin, DE; A.Mann: "The GSM standard - the basis for digital European of specific mobile unknetze f" th Be 131-152 in connection with the publication telecom practice 4/1993, P. Smolka "GSM radio interface '- elements and Functions", Pages 11 to 24].
• the air interface for the GSM system knows a variety of logical channels called bearer services, e.g. an AGCH channel (Access Grant CHannel), a BCCH channel (BroadCast CHannel), a FACCH channel (Fast Associated Control CHannel), a PCH channel (Paging CHhannel), an RACH channel (Random Access CHannel) and a TCH channel (Traffic CHannel), whose respective function in the air interface, for example in the publication Informatik Spektrum 14 (1991) June, No.
• AGCH channel Access Grant CHannel
• BCCH channel BroadCast CHannel
• FACCH channel Fest Associated Control CHannel
• PCH channel Paging CHhannel
• RACH channel Random Access CHannel
• TCH channel Traffic CHannel
• the biggest difference between the GSM system, which has a frequency and time level and is operated in a coordinated, licensed mode, and the DECT system, which also has a frequency and time level, which operates in a 12 nem uncoordinated, unlicensed mode is the way in which the physical resource "channel" is assigned to the respective system subscriber or telecommunications subscriber.
• the channel allocation is controlled by a central entity, the network operator. This is possible because all the mobile stations within a radio area of a base station use the same time base, that is, they are operated synchronously. The synchronous operation allows a clear definition of time slot boundaries and thus a clear separation from different telecommunication participants. Adjacent base stations do not need to be operated synchronously, since the channels which are used in adjacent radio cells are generally separated by frequency planning in the frequency level. This type of channel allocation is referred to as "Fixed Channel Allocation (FCA)".
• FCA Fixed Channel Allocation
• the channels are first selected dynamically - "Dynamic Channel Selection (DCS)" - and then allocated.
• the frequency / time level serves both for “Dynamic Channel Selection (DCS)” and for channel allocation as a platform or “pool".
• DCS Dynamic Channel Selection
• the handset regularly monitors the frequency / time level and finally selects the frequency / time slot combination in which the transmission channel is least disturbed by interference.
• neighboring, uncoordinated operating base stations and mobile parts are always asynchronous and therefore the time bases run into one another or drift into one another, a situation often arises where the degree of interference reaches an unacceptable value.
• a forwarding of the telecommunications connection - a handover - to another channel, ie a different frequency / time slot combination, 13 leads or is initiated. In such a case one speaks of an "intra cell handover".
• the WCDMA / FDD operation and the TDCDMA / TDD operation should be used together in the context of the UMTS scenario (3rd mobile radio generation or IMT-2000), in addition to efficient handling of the logical channels and the transmission path services ( bearer handling) especially for the above reasons, the implementation of a suitable "handover" procedure for telecommunication systems with wireless, based on code and time division multiplex telecommunication between mobile and / or stationary transceivers is indispensable.
• the object on which the invention is based is to provide a secure "handover" procedure for telecommunication systems with wireless telecommunications based on code and time division multiplexing between mobile and / or stationary transceivers after the display of a "handover".
• the idea underlying the invention is that - according to claim 1 - for telecommunications systems with wireless, based on code and time division multiplex telecommunications between mobile and / or stationary transceivers, both in the TDD mode and in the FDD mode 1) during a first phase of a "handover" procedure, the display of a "handover", a "handover” time slot pair is determined by a stationary transceiver, 2) during a second phase of the "handover M -Procedure, the initiation of a "handover", the stationary transceiver sends a first message "handover request" to the stationary transceiver associated mobile transceiver, with which the stationary 14 ordinary transceivers notify the mobile transceivers of the "handover” time slot pair, and the stationary transceiver sends the first message "handover request" to the mobile transceivers until all of the stationary ones Mobile transceivers assigned to the transceiver have confirmed the initiation of the "handover” by the first message, 3) during
• FIGS. 8 to 10. show:
• FIG. 8 shows a comparison with the time frames in FIGS. 1 to 3 and the DECT transmission time frame in FIG. 7 with regard to the number of time slots (modified) TDD time-division multiplex frames,
• FIG. 9 on the basis of the time-division multiplex frame according to FIG. 8, a channel allocation table for channels with a frequency, code and time-division multiplex component,
• FIGURE 10 is a message flow diagram of a "handover" procedure.
• FIGURE 8 shows, starting from the time frames in FIGS. 1 to 3 and the DECT transmission time frame in FIGURE 7, a (modified) TDD time-division multiplex frame ZMR with eight time slots ZS ⁇ 1 ... ZS ⁇ 8, the first four time slots ZS ⁇ 1 ... ZS for the downward transmission direction DL and the second four time slots ZS 5 ... ZS ⁇ 8 for the upward transmission direction UL are provided.
• the number of time slots is from "16" according to FIGURES 1 and 3 to "8" only for reasons of illustration for the channel allocation table. 15 le has been reduced in FIGURE 9 and has no restrictive, limiting influence on the invention. On the contrary - the number of time slots - like the other physical resources (eg code, frequency, etc.) - can be varied to a greater or lesser extent depending on the telecommunications system.
• FIGURE 9 shows, based on the time-division multiplex frame according to FIGURE 8, a channel allocation table for channels with a frequency, code and time-division multiplex component.
• the time division multiplex component of this table comprises the time slots ZS 1 ... ZS ⁇ 8 with the TDD division according to FIG. 8.
• the frequency ultiplex component comprises 12 frequencies FR1 ... FR12, while the code multiplex component 8 codes (pseudo Random signals) C1 ... C8 contains.
• RACH channel, the TCH channel and / or the FACCH channel, which are required in the telecommunication system in the downward direction and / or upward direction, are bundled in a code level spanned by the codes C1 ... C8.
• This bundling has proven to be expedient for the above-mentioned telecommunication systems because it avoids unnecessary occupancy of time slots, that is to say the resource “time”.
• FIGURE 9 shows a preferred embodiment according to which on the first frequency FR1 in the downward transmission direction in a first time slot ZS ⁇ 1 as a fixedly specified (agreed) first selection time slot and in the upward transmission direction in a fifth time slot ZS ⁇ 5 as a fixedly specified (agreed) second selection time slot, preferably all codes C1 ... C8 are used to bundle the above-mentioned transmission path services.
• all codes C1 ... C8 are used to bundle the above-mentioned transmission path services.
• time slot ZS 2 six codes - a first code Cl, a second code C2, a third code C3, a fourth code C4, a fifth code C5 and a sixth code C6 - and in the upward transmission direction in a sixth time slot ZS ⁇ 6 again the six Codes C1 ... C6, while the second group of telecommunication connections G2 on the second frequency FR2 in the downward transmission direction occupies the first code Cl in a fourth time slot ZSM and in the upward transmission direction in an eighth time slot ZS ⁇ 8.
• the fourth time slot ZS and the second time slot ZS ⁇ 2 are “downlink” time slots ZSDOWN, while the sixth time slot ZS ⁇ 6 and the eighth time slot ZS ⁇ 8 are “uplink” time slots ZSU P.
• a first distance AS1 between the "downlink" time slot ZSDOWN and the "uplink” time slot ZSU P - according to the prior art (cf. FIG. 7) - is as long as half
• Time division frame ZMR The distance AS1 is thus a fraction of the length of the time-division multiplex frame ZMR, the fraction having the value 0.5.
• the fourth time slot ZSM and the second time slot ZS X 2 are “downlink” time slots ZSDOWN, while the seventh time slot ZS ⁇ 7 and the fifth time slot ZS 5 are “uplink” time slots ZSup.
• a second distance AS2 between the "downlink" time slot ZSDOWN and the "uplink" time slot ZSup is as long as a fraction (distance) of the length of the time-division multiplex frame ZMR, the fraction being dimensioned and larger or smaller than the value 0.5 such that the second distance AS2 is fixed.
• the first group of telecommunication connections Gl occupies the four codes C1 ... C4 in the downward transmission direction on a sixth frequency FR6 in the second time slot ZS 2 and in the upward transmission direction on a fifth frequency FR5 in the eighth time slot ZS ⁇ 8 the six codes C1 ... C6 as well as a seventh code C7 and an eighth code C8, while the second group of telecommunication connections G2 in the downward transmission direction on the sixth frequency FR6 in a third time slot ZS ⁇ 3 the codes C1 ... C3 and in the upward direction - Direction of transmission on the fifth frequency FR5 in the fifth time slot ZS ⁇ 5 occupies the codes C1 ... C4.
• the second time slot ZS ⁇ 2 and the third time slot ZS ⁇ 3 are “downlink” time slots ZSDOWN, while the eighth time slot ZS ⁇ 8 and the fifth time slot ZS ⁇ 5 are “uplink” time slots ZSup.
• a third distance AS3 between the "downlink" time slot ZS D OWN and the "uplink” time slot ZSup is a fractional distance of the length of the time-division multiplex frame ZMR, the fraction in each case is dimensioned such that the third distance AS3 is variable.
• the first group of telecommunications connections Gl occupies the first code C1 in the downward transmission direction on an eighth frequency FR8 in the fourth time slot ZSM and in the upward transmission direction on a ninth frequency FR9 in the sixth time slot ZS ⁇ 6 the seven codes C1 ... C7, while the second group of telecommunication connections G2 in the downward transmission direction on the eighth frequency FR8 in the third time slot ZS ⁇ 3 the first code Cl and in the upward transmission direction on the ninth frequency FR9 in the fifth time slot ZS ⁇ 5 the first Code C1 occupied.
• the fourth time slot ZSM and the third time slot ZS 3 are “downlink” time slots ZS DOWN , while the sixth time slot ZS ⁇ 6 and the fifth time slot ZS'5 are “uplink” time slots ZSup.
• a fourth distance AS4 between the "downlink" time slot ZS DO W N and the "uplink” time slot ZS UP is a fraction (distance) of the length of the time-division multiplex frame ZMR, the Fraction is dimensioned so that the fourth distance AS4 is fixed.
• the first group of telecommunication connections G1 on an eleventh frequency FR11 in the downward transmission direction in the fourth time slot ZSM occupies the first code Cl and the second code C2 and in the upward transmission direction in the fifth time slot ZS ⁇ 5 the first code Cl and the second code C2, while the second group of telecommunication connections G2 on the eleventh frequency FR11 in the downward transmission direction in the first time slot ZS 1 occupies the codes C1 ... C5 and in the upward transmission direction in the eighth time slot ZS ⁇ 8 the codes C1 ... C3.
• the fourth time slot ZSM and the first time slot ZS ⁇ 1 are “downlink” time slots ZS D OWN, while the fifth time slot ZS ⁇ 5 and the eighth time slot ZS ⁇ 8 are “uplink” time slots ZSU P.
• a fifth distance AS5 between the "downlink" time slot ZSDOWN and the "uplink” time slot ZS UP is as long as a fraction (distance) of the length of the time-division multiplex frame ZMR , the fraction being dimensioned such that the second distance AS2 is variable.
• the "handover" procedure basically consists of three phases, a first phase, which is referred to as the indication of a "handover” (handover indication), a second phase, which is called the initiation or initiation of a “handover” (handover initiation) is referred to, and a third phase, which is referred to as the execution of a "handover” (handover execution), which take place in the order given.
• a “handover” is displayed by a base station BS, that is to say a first phase of the “handover” procedure is started.
• the deterioration in the quality of the service to be transmitted [Quality of Service (QoS)] can alternatively also be determined by a mobile part, a first mobile part MT1, a second mobile part MT2 or an nth mobile part MTn, which then causes this deterioration in the base station BS , for example via the FACCH channel.
• the base station BS is the "master” with respect to the "handover” procedure, while the mobile part MTl ... MTn is the "slave”.
• the handset it is also possible for the handset to be the "handover” procedure "Master” and the base station is the "slave”.
• the mobile parts MTl ... MTn connected to the base station BS change, if the affected mobile parts MTl ... MTn still have to transmit current data, immediately after receiving the first message Ml from the telecommunication time slot pair to the "handover" time slot pair In this case, the data transmission in the pair of telecommunication slots is ended and in the “handover” slot pair continues seamlessly.
• the respective mobile part MT1 ... MTn transmits a second message "Handover Confirm" M2 on a signaling channel to the base station BS.
• the base station BS thus receives data simultaneously in the pair of telecommunications timeslots and the "handover" pair of timeslots and, on the other hand, receives the second message M2
• Initiation of the "handover" by the first message Ml is ultimately regarded as confirmed by the base station BS if - in the former case - those transmitted by the respective handset MTl ... MTn on the "uplink" time slot of the "handover" time slot pair Data are received from the base station BS without errors or if - in the second case - the base station BS receives the second message M2.

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• 1999
  • 1999-03-01 RU RU2000124529/09A patent/RU2214070C2/ru not_active IP Right Cessation
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