Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W36/00—Hand-off or reselection arrangements
  • H04W36/06—Reselecting a communication resource in the serving access point
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W36/00—Hand-off or reselection arrangements
  • H04W36/24—Reselection being triggered by specific parameters
  • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data

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 transmitters and receivers 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 methods Multiple use of the message transmission link FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access) and / or CDMA (Code Division Multiple Access) - e.g. B. according to radio standards such as
• FDMA Frequency Division Multiple Access
• TDMA Time Division Multiple Access
• CDMA Code Division Multiple Access
• GSM Global System for Mobile Communication
• 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 "GSM radio interface - elements and functions ", 2 pages 17 to 24],
• the type of transmission according to (1) ... (3) is usually characterized by continuous (analog) signals, while the type of transmission according to (4) usually produces discontinuous signals (e.g. pulses, digital signals).
• 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-level structure" of 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 transmitting / receiving device
• 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 (ideband 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 Description 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 with respect to the first physi ⁇ rule channel DPCCH as a burst structure of a pilot sequence PS with püot bits for channel estimation, a TPC sequence TPCS with N T PC bits for power control (Traffic Power Control) and a TFCI sequence TFCIS with N TFC ⁇ bits for specifying the transport format (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 document TSG RAN is based of the telecommunication system in upward and downward direction of the telecommunications according WG1 (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) either has a first time slot structure (burst structure) ZSS1, in accordance with the ARIB proposal, in the sequence consisting of a first user data sequence NDS1 with N data ⁇ bits, the pilot Sequence PS with Npii 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 useful data sequence NDS2 and a guard time zone SZZ (guard period) with N Gu ard _ 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.
• a first time slot structure (burst structure) ZSS1 in accordance
• 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 (transmitter / receiver) a first radio cell FZ1 and a second base station BTS2 (transceiver) "illuminating" a second radio cell FZ2 omnidirectionally, and starting from the FIGURES 1 and 2 show a radio scenario with multiple channel utilization according to frequency / time / code multiplex, in which the base stations BTS1, BTS2 have an air interface designed for the radio scenario and have a plurality of mobile stations MSI ... MS5 located in the radio cells FZ1, FZ2 ( Send-
• the base stations BTS1, BTS2 are known
• the base station controller BSC BaseStation Controller
• the base station controller BSC 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 connected via a mobile switching center MSC (Mobile Switching Center) to the higher-level telecommunications network, e.g. the PSTN (Public Switched Telecommunications Network).
• the mobile switching center MSC is the administration center for the telecommunications system shown. It takes over the complete call management and, with associated registers (not shown), the authentication of the telecommunication participants 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).
• Ka ⁇ can be estimated nalimpulsantwort which is Funknach- 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.
• DSW data-to-symbol converter
• 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 telecommunications system that 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 75-1... 9, October 1992 and the DECT publication of the DECT forum, February 1997, 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 75-1... 9, October 1992 and the DECT publication of the DECT forum, February 1997, pages 1 to 16].
• FIGURE 7 shows a DECT transmission time frame with a time duration of 10 ms, consisting of 12 “downlink” time slots and 12 “uplink” time slots.
• a free time slot pair with a "downlink” time slot ZSDO N and an "uplink” is used in accordance with the DECT standard.
• - Time slot ZSUP selected, in which the distance between the "downlink” -
• Time slot ZS DO W N 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.
• GSM Global System for Mobile Communication
• 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 "GSM radio interface - elements and functions" , Pages 17 to 24].
• the air interface for the GSM system knows a variety of logical channels called bearer services, such as 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), their respective functions in the air interface, for example in the publication 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.
• bearer services such as an AGCH channel (Access Grant CHannel), a BCCH channel (BroadCast CHannel, a FACCH channel (Fast Associated Control CHannel) ), a PCH channel (Paging CHhannel), an
• the GSM system also has a frame structure in which the 13th time frame in the multi-frame as" Idle "Frame is formed. In this" Idie "Ra If no user data is transmitted, the mobile stations in the GSM system 12 Ability to carry out various measurements, in particular measurements for pre-synchronization for possible “handover” procedures.
• 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 Kanalzutei ⁇ development is called "Fixed Channel Allocation (FCA)".
• the channels are first selected dynamically - "Dynamic Channel Selection (DCS)" - and then allocated .
• the frequency / time plane serves both the “Dynamic Channel Selection (DCS)” and for the Kanalzu ⁇ distribution 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 likely to occur 13 interference is disturbed.
• the fact that 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 often creates a situation where the degree of interference reaches an unacceptable value.
• a forwarding of the telecommunication connection - a handover "- must be initiated or initiated on another channel, that is to say a different frequency / time slot combination. 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 UMTS scenario (3rd generation of mobile telephony or IMT-2000), in addition to efficient handling of the logical channels and the Transmission path services (bearer handling), in particular 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 method for telecommunication systems with wireless, based on code and time multiplex based telecommunication between mobile and / or stationary transceivers within the scope of a "handover" procedure that indicates the display of a "handover.” "(Handover Indication) for different operating modes of the transceivers.
• 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 frame in FIGURES 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 ⁇ l ... ZS ⁇ 8, wherein the first four time slots ZS ⁇ l ... ZS for the downward transmission direction DL and the second four time slots ZS X 5 ... ZS X 8 for the upward transmission direction UL are provided.
• the number of time 15 slots has been reduced from "16" according to FIGURES 1 and 3 to "8" only for the sake of illustration for the channel assignment table in FIGURE 9 and has no restrictive, limiting influence on the invention.
• 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 on the basis of the time-division multiplex frame
• FIGURE 8 is a channel allocation table for channels with a frequency, code and time division multiplexing component.
• the time division multiplex component of this table comprises the time slots ZS ⁇ 1 .-. ZS ⁇ ⁇ with the TDD division according to FIGURE 8.
• the frequency division multiplex component comprises 12 frequencies FR1 ... FR12, while the code division multiplex component 8 codes (pseudo Random signals) C1 ... C8 contains.
• transmission services such as logical channels of the telecommunications system such as the control channel for Signalisie ⁇ are called "bearer services" rung, the AGCH channel, the BCCH channel, the PCH channel, the 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, in one by the codes
• 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'l as a fixed (agreed) first selection time slot and in the upward transmission direction in a fifth time slot ZS ⁇ 5 as a predetermined (agreed) second selection time slot preferably all codes C1 ... C8 for each 16 bundling of the aforementioned transmission path services can be used. It is of course also possible to use less or, if more than these eight codes are available, also more codes.
• the codes C1 ... C8 in the first time slot ZS ⁇ l are divided so that one code for the control channel for signaling and the AGCH channel, another code for the BCCH channel and the PCH channel and the remaining six codes for the
• TCH channel reserved or assigned, while the codes C1 ... C8 in the fifth time slot ZS 5 are divided so that a code for the RACH channel, another code for the FACCH channel for handover indication and remaining six codes are reserved or assigned for the TCH channel.
• connection scenario VSZ1 a first connection scenario VSZ1, a second connection scenario VSZ2, a third connection scenario VSZ3, a fourth connection scenario VSZ4 and a fifth connection scenario VSZ5, in each case a plurality of bidirectional TDD telecommunication connections, for which the physical resource “code, frequency, time” in the downward and upward transmission direction are assigned in part equally and in part unequally.
• connection scenario VSZ1 a connection scenario VSZ1 ..
• .VSZ5 belongs, for example, to a first group of telecommunication connections G1, which is marked with an ascending and descending hatching, and a second group of telecommunication connections G2, which is marked with a descending hatching, each group containing at least one bidirectional Telecommunications connection. 17
• the first group of telecommunications connections G1 on a second frequency FR2 in the downward transmission direction occupies six codes in a second time slot ZS x 2 - a first code C1, 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 telecommunications connections G2 on the second frequency FR2 in the downward transmission direction in a fourth time slot ZS the first code C1 and in the upward transmission direction in an eighth time slot ZS'8 again the first code C1.
• the fourth time slot ZSM and the second time slot ZS ⁇ 2 are “downlink” time slots ZS DO N , while the sixth time slot ZS ⁇ 6 and the eighth time slot ZS 8 are “uplink” time slots ZSup.
• a first distance AS1 between the "downlink" time slot ZS DO and the "uplink" time slot ZSup - according to the prior art (cf. FIG. 7) - is as long as half the time division multiplex frame ZMR.
• the distance AS1 is therefore a fraction of the length of the time-division multiplex frame ZMR, the fraction having the value 0.5.
• the first group of telecommunication connections G1 occupies the six codes C1... C6 on a fourth frequency FR4 in the downward transmission direction in the fourth time slot ZS and again the six codes C1 in a seventh time slot ZS ⁇ 6 in the upward transmission direction. ..C6, while the second group of telecommunication connections G2 on the fourth frequency FR4 in downlink direction in a second time slot ZS ⁇ ⁇ 2, the codes C1 ... C4 and in Auf thoughübertragungs- 18 direction in the fifth time slot ZS 5 occupies the first code C1 and the second code C2.
• the fourth time slot ZSM and the second time slot ZS 2 are “downlink” time slots ZS DO WN, while the seventh time slot ZS 7 and the fifth time slot ZS 5 are “uplink” time slots ZS UP .
• a second distance AS2 between the "downlink" time slot ZS D ON and the "uplink" time slot ZS UP SO is as long as a fraction (distance) of the length of the time-division multiplex frame ZMR , the fraction being so dimensioned and greater or smaller than the value 0.5 that the second distance AS2 is fixed.
• the first group of telecommunication connections G1 in the downward transmission direction on a sixth frequency FR6 in the second time slot ZS 2 occupies the four codes C1 ... C4 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 transmission direction 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 ZS DOWN, during the eighth time slot ZS ⁇ 8 and the fifth time slot ZS X 5" Uplink "-Time slots are Z SUP.
• a third distance AS3 between the "downlink" time slot ZS D0WN and the "uplink” time slot ZS UP is a fraction. 19 part (fractional distance) of the length of the time-division multiplex frame ZMR, the fraction being dimensioned such that the third distance AS3 is variable.
• the fourth time slot ZSM and the third time slot ZS ⁇ 3 are “downlink” time slots ZS D OW N , 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 D0WN and the "uplink” time slot ZS UP is a fractional distance of the length of the time division multiplex frame ZMR, the fraction in each case 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 l the codes 20 C1 ... C5 and in the upward transmission direction in the eighth time slot ZS ⁇ 8 the codes C1 ... C3 are occupied.
• the fourth time slot ZSM and the first time slot ZS ⁇ 1 are “downlink” time slots ZS D0WN , while the fifth time slot ZS ⁇ 5 and the eighth time slot ZS ⁇ 8 are “uplink” time slots ZS UP .
• a fifth distance AS5 between the "downlink" time slot ZS D ON 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 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 indicated 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 Quality of Service
• a mobile part a first mobile part MT1, a second mobile part MT2 or an nth mobile part MTn
• the base station BS is the "master” with regard to the "handover” procedure
• the mobile part MT1 ... MTn is the "slave”.
• the 21 handset with regard to the "handover” procedure is the "master” and the base station is the "slave”.
• the base station BS uses a channel selection list to select a “handover” time slot pair in which the quality of the service to be transmitted is better than the existing telecommunications time slot pair.
• the display of the "handover”, the "handover” time slot pair is already established.
• the channel selection list is created using the dynamic channel selection method "Dynamic Channel Selection (DCS)".
• DCS Dynamic Channel Selection
• the base station BS switches off the signaling on the BCCH channel, detects the interference situation in the GSM-specific “idle” frame by determining the interference power, for example by measuring the signal field strength, in the pair of telecommunications timeslots and stores the measured results (
• a threshold value is defined which lies between the currently detected interference value and an interference value which belongs to the "quietest" time slot pair. The base station BS should then not make an entry in the channel selection list and / or not display and initiate a "handover” if the predetermined threshold value is not exceeded by the interference value detected in each case.
• the second phase of the "handover" procedure begins with the base station BS establishing a BCCH channel in the "downlink" time slot of the "handover” time slot pair. On this "downlink” time slot the "handover" time slot pair are in traffic mode
• the base station BS After the successful establishment of the BCCH channel in the "downlink" time slot of the "handover” time slot pair, the base station BS transmits a first message "handover request" MI via the BCCH channel in the downlink "time slot of the telecommunication time slot pair to the mobile parts MTl ... MTn connected to the base station BS via this channel. With this first message Ml, the position of the "handover" time slot pair is communicated to the mobile parts MTl.-.MTn.
• the base station BS After the transmission of the first message Ml, the base station BS continues the simultaneous transmission of the information (data services) in the downlink "time slots of the telecommunication time slot pair and the" handover "time slot pair and also transmits the first message Ml on the BCCH channel "slot-pair until all ver with the base station BS-bound ⁇ handsets MTl ... MTn initiating the -Zeitschlitzen of Wegmunikationszeit-" have confirmed handover "by the first message Ml in the downlink.
• the problems associated with the base station BS handsets MTl.-.MTn change if the handsets concerned MTl ... MTn have to transmit nor lau ⁇ Fende data after receiving the first message Ml directly from the Wegmunikationszeitschlitz- couple to the "handover"
• the data transmission in the telecommunication time slot pair is terminated and continued seamlessly in the “handover” time slot pair.
• the respective handset MTl ... MTn transmits a second message "Handover Confirm" M2 23 on a signaling channel to the base station BS.
• the base station BS thus simultaneously receives data in the telecommunication time slot pair and the "handover" time slot pair and, on the other hand, the second message M2.
• the initiation of the "handover” by the first message M1 is ultimately regarded as confirmed by the base station BS if - in the former Case - the data transmitted by the respective mobile part MTl ... MTn on the "uplink" time slot of the "handover" time slot pair are received by 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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