MXPA99011032A - Methods and arrangements in a radio communications system - Google Patents

Abstract

The present invention relates to a method and an arrangement for synchronising communication of framed data via asynchronous base stations (BS1, BS2) in a cellular communications system, e.g. a CDMA system. The synchronisation method is performed continuously by sending out certain system frame counter states from a central node in the system to all its connected base stations (BS1, BS2). Each base station (BS1, BS2) comprises a local frame counter (LFCBS1;LFCBS2), which generates local frame counter states (t1(1)-t1(4);t2(1)-t2(4)) correlated to the the system frame counter states. Transmission of information via the base stations (BS1, BS2) is synchronised by assigning each data frame (DF(1)-DF(4)) a particular frame number, which is given by the local frame counter states (t1(1)-t1(4);t2(1)-t2(4)), so that data frames (DF(1)-DF(4)) having identical numbers contain copies of a certain data packet. Correct frame numbers are derived from common downlink channel offset measurements (CCO1;CCO2) carried out in the base stations (BS1, BS2), and timing advance values (TA2) and downlink channel offsets (DCO1;DCO2) calculated in the central node.

Description

METHODS AND ARRANGEMENTS IN A RADIOCOMMUNICATION SYSTEM TECHNICAL FIELD The present invention relates to a method for synchronizing data communication in frames through asynchronous base stations in a cellular communication system, for example, a CDMA system (Multiple Access per Division of Code). The synchronization method is carried out continuously, but particularly in the connection establishment and during the execution of a soft transfer. The invention also focuses on an arrangement for performing the aforementioned method. STATE OF THE ART Today there is a growing interest in the use of CDMA or extended spectrum systems in commercial applications. Some examples include radio or digital cellular systems, land mobile radio, satellite systems as well as personal communication networks for indoor and outdoor, collectively referred to herein as cellular systems. A CDMA system allows signals to be joined in both time and frequency. Thus, CDMA signals share the same frequency spectrum. In the frequency domain or the time domain, the multiple access signals appear on top of each other. There are several advantages associated with CDMA communication techniques. The capacity limits of cellular systems based on CDMA are high. This is a result of the properties of a broadband CDMA system, such as improved interference diversity, selection of voice activity, and reuse of the same spectrum in interference diversity. In principle, in a CDMA system, the information data stream has to transmit on a much higher velocity data stream which is known as a signature sequence. Typically, the signature sequence data is binary, providing a stream of bits. One way to generate this signature sequence is with a PN (pseudo-noise) process that looks random but can be replicated by an authorized receiver. The information data stream and the high bit rate signature sequence stream are combined by multiplying the two bit streams together, considering that the binary values of the two bit streams are represented by +1 or - 1. This combination of a higher bit rate signal with the lowest bit rate data stream is known as the extension of the information data stream signal. Each stream of information data or channel receives a unique extension code. The ratio between the bit rate of signature sequence and the bit rate of information is known as the extension ratio. ' Several encoded information signals modulate an I! carrier of radio frequencies, for example, by QPSK I (Manipulation by Displacement in Quadrature of Phase), and are jointly received as a composite signal in a receiver i. Each of the coded signals splices all i the other coded signals, as well as related I I signals with noise, both in frequency and time. If the receiver has authorization, then the composite signal is correlated with one of the unique codes and the corresponding I information signal can be isolated and decoded. CDMA, which is also known as DS-CDMA (Direct Sequence - CDMA) to distinguish it from FH-CDMA (Frequency Hopping - CDMA), the aforementioned "information bits" can also be encoded bits, where the code used is a block or convolutional code. One or several bits of information can form a data symbol. Also, the signature sequence or mask of the coding can be much larger than a single code sequence. In this case, a subsequence of the signature sequence or coding mask is added to the code sequence. In the CDMA cellular communication system, each cell has several units of modulator-demodulator or extended-spectrum modem. Each modem consists of a digital extended spectrum transmission modulator, at least one digital spread spectrum data receiver and a receiver scanner. Each modem in the base station BS can be assigned to a mobile station as required to facilitate communications with the assigned mobile station MF. In many cases, many modems are available for use while others can be active to communicate with respective mobile stations. A soft transfer scheme is used for a CDMA cellular communication system in which a new base station modem is assigned to a mobile station while the old base station modem continues to answer the call. When the mobile station is located in the transition region between the two base stations, it communicates with both base stations. Similarly, if a base station is responsible for more than one geographic sector, the transfer can be carried out between different sectors belonging to the same base station. When mobile station communications are established with a new base station or a new sector for example, the mobile station has good communications with the new cell or sector, the old base station / modem stops answering the call. This smooth transfer is essentially a switching function without interruption. The mobile station determines the best new base station, or sector, to which communications must be transferred from a base station or old sector. While it is preferable that the mobile station initiate the transfer request and determine the new base station, transfer process decisions can be carried out as in a conventional cellular telephone system where the base station determines when a transfer is appropriate and, through the system controller, it asks neighboring cells or neighboring sectors to look for the signal from the mobile station. The base station that receives the strongest signal in accordance with that determined by the system controller then accepts the transfer. In the CDMA cellular communication system, each base station normally transmits a pilot cut signal in each of its sectors. This pilot signal is used by the mobile stations to obtain an initial system synchronization and to provide a robust time, frequency and phase tracking of the signals transmitted by the base station during what is known as a synchronization phase of the system. Air interface chip. The RNC (Radio Network Control Node) maintains its synchronization with the PSTN (Public Switched Telephone Network). An active set for a specific mobile station is a list of sectors through which the mobile station communicates. The addition of sectors and / or the decrease of sectors of the active set is known as ASU (Active Set Update) as well, a regular transfer from a first base station (serving a first sector) to a second base station (which serves a second sector) can be defined as the active set that before the transfer contains only the first sector and after the transfer contains only the second sector. The transfer from the first base station to the second base station can, of course, also be defined as the active set originally containing several sectors, ie the first sector, but not the second sector, and after the transfer the active set contains several sectors, that is, the second sector, however not the first sector. In addition, a transfer can be carried out either between identical frequencies, which is known as an intra-radio frequency transfer (intra RF-HO) or between different frequencies, what is known as frequency transfer inter radio (inter RF-HO) The exact definition of the transfer is irrelevant to the current application since the invention refers only to the active set update and particularly to the addition of 1 or more sectors to the active set.

The active set may also be different for the uplink connection than for the downlink connection for a particular mobile station. For ele, it is possible that the active set contains many different sectors of the same base station for the uplink and only one of these sectors for the corresponding downlink connection. During macrodiversity, the active set contains sectors, which are served by more than one base station. Macrodiversity should be used during a smooth transfer, while a hard transfer implies that the active set never contains more than one sector during the procedure. Radio frequency synchronization is achieved through the detection and selection of a particular chip sequence, which is related to the strongest radio frequency carrier received by the mobile station. This allows the identification of the base station that gives "best service". Said chip sequence refers to a system time that is used, for ele, to set the air interface frame transmission time. In a CDMA system, the splicing of the time segments as in the TDMA (Time Division Multiple Access) systems is not a problem since a mobile station transmits continuously, and therefore does not require synchronization with other mobile stations. However, when a mobile station is connected to more than one base station in macrodiversity, there is a need to synchronize the base stations in the downlink (also known as the forward link). Macrodiversity in a CDMA system can be achieved with synchronized base stations. The base stations are usually synchronized with all the base station digital transmissions referred to a common CDMA system time scale using the GPS (Global Positioning System) time scale, which can be tracked and synchronized with UTC ( coordinated universal time). The signals of all the base stations are transmitted at the same time. In order to activate the macrodiversity, the base stations can be synchronized in accordance with what is described above through a common time reference; GPS. Accordingly, the signals transmitted from the base stations are synchronized over time however, due to different propagation delays in the links, the signals arrive at different times of time in the mobile station. Normally in CDMA systems, a rake receiver is used to handle the time dispersion and macrodiversity can be observed as a time dispersion from a receiver perspective. The principle of the rake receiver is to collect the energies of different ways and combine them before making a decision of bits. Methods for continuously monitoring the delay parameters between two nodes in a frame relay network or ATM are known from document US, A, 5 450 394. Special measurement cells contain a time stamp indicating the time when a cell is sent and a delay value, which indicates a difference between the reception time and the transmission time. US, A, 4 894 823 discloses an alternative method for stamping time on data packets, which are transmitted through a fixed communication network. The delays experienced by data packets in network nodes are measured by inserting a source time value into the header of each packet when registering a node and updating this time value in an output time marker function when the packet has been transported through the node. A method for time alignment of downlink transmissions in a CDMA system is disclosed in WO, Al, 94/30024. Signals for a specific cellular call connection are synchronized through, first of a mobile station which measures the time difference between the connected base station signal and the signal of a candidate base station of macrodiversity.

This measurement is then transmitted to the network, which finally compensates the difference and synchronizes the base stations in such a way that a transfer can be carried out in which no data is lost during the procedure. US Pat. No. 5,450,394 and US Pat. No. 4,894,823 offer solutions for estimating transmission delays in data communication systems in frames. However, the documents do not teach how to achieve synchronized communication between multiple base stations and a specific mobile station despite these delays. In accordance with WO Al 94/30024, a method for achieving time alignment of downlink transmissions in a CDMA system is known, however, there is no solution as to how these transmissions should be controlled when the delay differences between signals transmitted from different base stations exceed the duration of half a data frame PRESENTATION OF THE INVENTION An object of the present invention is therefore to minimize the synchronization error between information frames sent to a specific mobile station. Asynchronous we understand here that a phase difference between signals transmitted from at least two different base stations is allowed and that the clock units in different base stations do not they are synchronized between them. Another object of the present invention is to avoid having to nder of an external time reference receiver in each asynchronous base station in order to meet the synchronization requirement during the update of the active set for a mobile station. Another object of the present invention is to minimize the need for separation in asynchronous base stations that simultaneously receive information frames from a specific mobile station. A further object of the present invention is to relax the need for separation in mobile stations and thereby reduce the complexity of the mobile stations. Another additional object of the present invention is to minimize the average round trip delay experienced in a cellular radio communication system and in a CDMA communication system, particularly. For round trip delay we understand the total time that is required (on average) for a hypothetical message to be sent from one endpoint of a connection to the other point and back. These objects are achieved by means of the present invention through the generation of certain system table counter states at a central node in the system - a radio network control node - connected to one or more base stations. Corresponding local frame counter states are generated at each base station in the system. A current sample of the system box counter status is regularly sent from the radio network control node to its connected base stations in order to synchronize each local box counter with the system box counter state which functions as a frame number reference within the cellular radio communication system. In accordance with one aspect of the present invention there is provided a method for regularly sending a system box counter state from a central node to its connected base stations. Each of the base stations adjusts their local frame counter states in such a way that they are all aligned with the system frame counter status. The synchronization of the data packets that are communicating through the base stations is then achieved by sending a data packet per data box, which is numbered in accordance with a frame counter status. The frame counter states are in the uplink part of a locally generated connection in each base station and in the downlink part of the connection., the frame controller states are derived from the controller states of the system box in the central node, which is typically a radio network control node. The above method is characterized from claim 1. In accordance with another aspect of the present invention, there is provided a method for establishing a connection between a particular mobile station and at least one base station that is based on the synchronization method aforementioned. First, an active set, comprising at least one downlink channel and an uplink channel is defined for the mobile station. The base station (s) where said channels will be assigned is (are) determined by measurements of pilot signal strength performed by the mobile station. Generally, all sectors whose pilot signal strength value exceeds a preset limit are candidates for the active set. However, a downlink channel does not necessarily have to be assigned in all these sectors and no more than an uplink channel must be assigned. Second, a timing advance value is established for downlink channel in the active set. The timing advance value specifies a compensation between a common downlink control channel for the sector and the downlink channel in question, and is chosen as a value that results in the most uniform distribution of the transmission load in the network and radio resources in the system, in terms of connections already in progress. Each base station measures, at regular intervals, a common downlink control channel offset between its local frame counter states and the common downlink control channel for each of its sectors. The results of the measurements are reported to the central node. As a third step, a downlink channel offset is calculated by adding the common downlink control offset to the timing advance value. Finally, a specific frame number is assigned to each data frame in each respective downlink channel. The frame number indicates in which data frame a particular data packet that is received from the central node will be transmitted. The data frames are numbered according to the following, an initial data frame, starting from the value of downlink channel offset after the current state of the local box counter status receives a frame number equal to the state current of the local box counter. The local box counter, on average, is incremented at a tick speed and corresponds to a tick for the duration - of a data box. However, due to adjustments of the local box counter in accordance with updates from the system box counter state, the local box counter may temporarily have a tick speed that is either slightly higher or slightly less than a tick. for the duration of a data box. Subsequent data tables receive table number according to their order in relation to the initial data table. A method for establishing a connection in accordance with this aspect of the invention is characterized herein by what is apparent from claim 10. In accordance with a further aspect of the present invention, a method is provided for initiating a communication through a second sector _with a particular mobile station that is already communicating information through at least a first sector, by using the aforementioned synchronization method. First, a frame shift between the downlink channel in the active set and a common downlink control channel of a candidate sector for an ASU is measured by the mobile station. Second, the frame shift value is reported to a central node. Third, the second sector is added to the active set. Fourth, a timing advance value and a downlink channel offset value are calculated for a downlink channel in the second sector. Fifth, the offset between the data frames to be transmitted in the downlink channel in the second sector and the common downlink control channel for that sector is set to be equal to the timing advance value. Finally, a specific frame number is provided to each data frame in the downlink channel in the second sector. This is carried out by assigning an initial data frame, which starts from the local box counter state in the base station serving the second sector plus the downlink channel offset value, falls within of half the duration of a data frame a frame number equal to the next local frame state in the base station serving the second sector. Each subsequent data frame is then assigned an integer increment of the initial number, which is equal to the order of each respective data frame in relation to the initial data frame. A method for initiating communication through an additional sector, when communication is already going through a first sector, according to this aspect of the invention is therefore characterized by what is clear from claim 11. An arrangement of In accordance with the present invention for communicating information in communication frame in a cellular radio communication system comprises one or more central nodes plus one or more base stations. The central node, which is typically a radio network control node, comprises in turn a master timing unit, a master control unit and a diversity transfer unit. The master timing unit generates system box counter states that are sent to the base stations, which are connected to the central node. The master control is a general control unit for the central node. This unit, for example, determines when to perform an ASU. In addition, it calculates the timing advance values and the downlink channel offset values that are used when listing data frames in the downlink channels. The diversity transfer unit is responsible for the simultaneous management of communication with a mobile station, through more than one base station. The aforementioned arrangement of the invention is characterized by what is apparent from claim 22. The present invention therefore offers a solution for carrying out an active set update (in relation to soft transfer execution) in a system of cellular radiocommunication comprising asynchronous base stations, without requiring GPS receivers in any base station. The proposed solution also ensures synchronization during the establishment of a connection with an asynchronous base station. Such small synchronization errors result in low average round trip delays in the system and allow the transport connections between the radio control node and the base stations to be asynchronous, for example, ATM connections. It also guarantees that there will be no table gliding errors neither in the downlink nor in the uplink of a connection. In addition, the separation requirements can be relaxed in the base stations as well as in the mobile stations. As a consequence of the low separation requirement, the mobile stations can be less complex and can be equipped with simpler rake receivers. DESCRIPTION OF THE FIGURES Figure 1 shows a cellular radio communication system Previously known CDMA connected to a fixed communication network; Figure 2 illustrates a previously known method for air interface synchronization; Figure 3 elucidates a picture slip problem that may occur in the method displayed in Figure 2; Figure 4 illustrates a method for air interface synchronization in accordance with one embodiment of the invention; Figure 5 shows a flow chart in relation to the method of the present invention for synchronizing asynchronous base stations; Figure 6 shows a flowchart in accordance with an embodiment of the present invention for establishing a connection in a cellular radiocommunication system; Figure 7 shows a flowchart in accordance with an embodiment of the present invention for initiating communication through a second sector while communication is being carried out through a first sector in a cellular radio communication system; Figure 8 shows an arrangement in accordance with an embodiment of the invention. The invention will now be described in greater detail with regard to the preferred embodiments and with reference to the accompanying drawings. PREFERRED MODALITIES Figure 1 shows a previously known CDMA cellular radio communication system 100 connected to a fixed communication network 10, such as the PSTN. Naturally, the fixed communication network 10 can be any type of network adapted to the type of data that is being transmitted through the CDMA 100 cellular radio system. If, say, packet data is communicated in the CDMA 100 system, the network fixed 10 is preferably a network PSPDN (Public Data Network Switched Packet) a network operating in accordance with IP (Internet Protocol), an ADM network or a relay network of frames. An MSC node (Mobile Services Switg Center) connects the cellular radio communication system CDMA 100 with the fixed communication network 10. The MSC node can be, in particular, what is known as the Mobile Gateway Switg Center, if it has connection to a communication network outside the CDMA 100 cellular radio communication system. The MSC node is in additional contact, for example through ATM connections with radio network control nodes RNC1 and RNC2, each connected to a or several base stations BS1, BS2 and BS3-BS5, respectively, through separate ATM connections. A special connection 110 between the radio network control nodes RNC1 and RNC2 can also be provided, which makes it possible to synchronize one radio network control node of the other in master-slave form, for example RNC1 is the master and RNC2 It is the subordinate. Alternatively, all radio network control nodes RNC1, RNC2 can be synchronized from the node MSC. Each base station BS1-BS5 is responsible for radio communication in certain geographic areas that are known as sectors sll-sl6, s21-s26, s31-s36, s41-s46 and s51-s56, respectively.

A certain sector is identified by at least one common downlink control channel, which is distinguished from all other channels in the vicinity by either a specific sequence or a specific sequence in combination with a frequency particular. A mobile station MS1-MS4 communicates with one or more base stations BS1-BS5 in delicate channels. The downlink part of said connection is established through at least one downlink channel and the uplink part is established through an uplink channel. Each sector S11-S56 generally has its own set of downlink and uplink channels. However, the assembly can be adapted in such a way that the channels included can vary. When a mobile station communicates with base stations through * more than one sector, it must be tuned to more than one downlink channel to decode the received data. A first mobile station MSI initially communicates with a base station BS2 in a sector S24. The transmission of data packets between the mobile station MSI and the base station BS2 is synchronized by a first radio network control node RNC1. When the mobile station MSI approaches a different sector S23, the pilot signal measured for this sector S23 grows sufficiently strong in such a way that the sector S23 becomes a candidate for an ASU (Active Set Update). That is, the communication will start between the mobile station MSI and the base station BS2 through sector S23. The mobile station MSI measures a frame shift value between its current downlink channel in sector S24 and the common downlink control channel in sector S23. The result of this measurement is then, through the base station BS2, reported to the radio network control node RNC1, where a timing advance value is calculated. The timing advance value is used to synchronize a downlink channel in sector S23 with the downlink channel used by mobile station MSI in sector S24. After having synchronized the two downlink channels, the active set for the connection to the mobile station MSI is updated and communication with the base station BS2 is initiated through sector S23. Possibly, communication through sector S24 is disconnected before terminating communication through sector S23. However, this does not have to be the case if, for example, the mobile station MSI again approaches sector S24. Then, on the contrary, communication is more likely to be disconnected through sector S23 first. A second mobile station MS2 establishes a connection with a base station BSl in sector _S14. The second mobile station MS2 regularly carries out measurements of the frame shift and pilot force from neighboring sectors of the sector S14 and reports the result of these measurements to the radio network control node RNC1, through the base station BSl . When a pilot force measurement indicates that the communication can be performed more effectively through another sector S21, and therefore to proceed there, a downlink channel in sector S21 will be easily synchronized with the current station downlink channel. Mobile MS2 in sector S14. However, the sector S21 is served by a base station BS2 different from the base station BS1 serving the sector S14. The synchronization between the downlink channels in sectors S14 and S21 is also achieved by calculating a timing advance value in the radio network control node RNCl. The active set for the mobile station MS2 is updated from the radio network control node RNC1 and communication continues in the sector S21. The communication through sector S14 may or may not be maintained, depending on which pilot force value mobile station MS2 measures for sector S21 in relation to a predetermined limit value where an ASU is carried out. Obviously, a mobile station MS3 can similarly maintain simultaneous communication through more than 2 sectors, for example, S32, S45, S51 and S56, which receive service from more than two base stations BS3-BS5. In such a case, when all base stations BS3-BS5 are connected to the same radio network control node RNC2, the synchronization of the downlink channels used for communication can be achieved in accordance with the method described above. . The exact sequence in which the communication is initiated and terminated through each respective sector S32, S45, S51 and S56 is irrelevant to the way in which synchronization is carried out and is only a consequence of pilot force measurements in relation to the predetermined limit value to carry out an ASU. A) Yes, the mobile station MS3 may be communicating through all the sectors S32, S45, S51 and S56 during a part of the call, during the whole call or periodically through only one or several sectors in any combination of the same. If a pilot signal strength measurement reported by a mobile station MS4 indicates that the communication must be initiated through a base station BS3, which is connected to a radio network control node RNC2 different from the control node of radio network RNC1, to which the base station BSl currently employed is connected, then it is essential that the radio network control nodes RNC1, RNC2 involved are synchronized with each other in order to achieve a synchronization of the downlink channels . Said synchronization receives from a central time reference. This can be achieved in several alternative ways. One way is to locate a reference time generator in each of the radio network control nodes RNC1, RNC2, which is responsible for making the synchronization signals generated by all the radio network control nodes RNC1, RNC2 in the cellular radio communication system 100 are in phase between them. Another way is to have some (or all) radio network control nodes RNC1, RNC2, synchronized in master-slave form from a central node in the system 100, such as the mobile gate services switching center GMSC or a specific master-slave radio network control node. The reference time generator is preferably constituted by a GPS receiver, but obviously it can be any device for indicating the time provided it has sufficient precision, such as for example an atomic clock. Figure 2 illustrates a previously known method for air interface synchronization in relation to an ASU. A mobile station in a first sector is communicating data in frames in a first downlink channel DCH1, for example, receives packet data in data frames in a synchronized manner. The first downlink channel DCH1 has a first timing advance value TAI for a first common downlink control channel CDCH1. When a measured pilot signal effort value indicates that an ASU must be carried out, the mobile station receives instructions through the radio network control node in the sense of measuring an Ofi2 frame offset between its current downlink channel DCH1 and a second common downlink control channel CDCH2 for a second sector, which is a candidate for the active set. The measured frame displacement value Ofi2 is reported to the radio network control node which calculates a second timing advance value TA2 by subtracting the frame displacement value Ofi2 from the duration Tf of a data frame, i.e. TA2 = Tf - Ofi2. After this, a second timing advance value TA2 is established for communication in a second dedicated channel DCH2 in the second sector. Thus, having achieved synchronization, an ASU is performed. An ASU means, in this case, that the second sector is added to the active set after which the communication on the second dedicated channel DCH2 starts. Figure 3 shows timing aspects of a known solution, where a set of DP (1) -DP data packets (4) are sent from a radio network control node RNC to a first base station BS1 and a second base station BS2, respectively. A first set copy of data packets DP (1) -DP (4) arrives at the first base station BSl after a first transmission time ti and is subsequently sent on a first downlink channel DCH1 to a mobile station specific. A second copy of the data packet set DP (1) -DP (4) arrives at the second base station BS2 after a second transmission time t 2. However, the difference t 2 - t 1 in a transmission time exceeds the duration T f / 2 of half a data frame. Therefore, the base station BS2 having its signals more delayed than the other will erroneously send all the data packets DP (1) -DP (4) in data frames that have a time displacement of a data frame (or several, if t 2 is of longer duration than tf of several data frames) in a second downlink channel DCH2. What is known as frame slip occurs, resulting in a signal shredder combination in the mobile station. That is, the signals sent from the first base station BC1 and the signals sent from the second base station BC2 will contain, in the mobile station, in each given time case, data from different data packets containing typically contradictory information. Accordingly, the mobile station will not be able to decode an unambiguous signal by combining the data queue packets received in the dedicated channels DCH1 and DCH2. The problem of frame slip, illustrated in FIG. 3, is solved by the present invention by the generation of SFC system frame counter states in each radio network control node of the cellular radio communication system. The SFC system table counter states are preferably sent to the base stations in dedicated and separate connections, for example ATM connections, in order to ensure the most constant delay possible for these signals. Figure 4 illustrates the timing aspects in accordance with the present invention when data packets are sent in data box DF (1) -DF (4) from a radio network control node to a mobile station through of a first sector, served by a first base station BSl, which employs a first downlink channel DCH1, while the transmission is initiated to the mobile data frame station DF (1) -DF (4), through of a second sector, which receives service from a second base station BS2, employing a second dedicated channel DCH2. The first sector and the second sector are associated with a first downlink control channel CDCH1 and a second downlink control channel CDCH2 common, respectively. Both base stations BSl, BS2 measure a common downlink control channel offset CCOl; CC02 between its common downlink control channels CDCH1, CDCH2 and a respective local box counter LF Bs? LFC Bs2. Each base station BS1, BS2, regularly reports its common downlink control channel offset CCO1, CC02 to the radio network control node RNC. In order to maintain a high synchronization accuracy in the frame numbering, the first BSl station regularly receives system box counter states from the radio network control node and generates from there, through its counter local LFC BSI box, a first synchronized series of local box control states LFC Bs? (n) The state of local table counter LFC Bs? (n) is updated from the radio network control node with sufficient frequency to keep it less offset from the SFC system box counter state than a fraction of the duration Tf of a data box, for example one tenth of the duration Tf of a data box. As can be seen in Figure 4, there is a small phase shift between the first local frame counter LFC BSI and the second local frame counter LFC Bs2- However, the method of the present invention ensures that data frames that are relate to a particular connection that is communicating through the base stations BSl, BS2 are always synchronized with each other. The first downlink channel DCH1 has a first TAI timing advance value towards the first common downlink control channel CDCH1. The first timing advance value TAI is, in the connection setting set to a value which places the particular connection optimally in time for the purpose of distributing a transmission load in the network resources between the base station BSl and the node of radio network control as well as the radio interface as uniformly as possible in relation to the connections already underway within the system. A first downlink channel offset DCOl is calculated as the offset CCOl between the common downlink control channel CDCH1 in the first sector and a first local frame counter state tl (l) plus the first timing advance value TAI, that is, DCOl = CCOl + TAI. The first downlink channel offset DCOl is used when the data frames DF (1) -DF (4) are numbered. By compensating for the common downlink control channel offset CCO1, CC02, through the downlink channel offset DCO1, a synchronization of the precise frame number with the SFC system frame counter states is achieved in the base station BSl. In the first base station BSl each data frame DF (1) - DF (4) is associated with a particular frame number tl (l) -tl (4) from the first series of local box counter states LFC Bs? (n) This frame numbering is carried out by assigning a first frame number tl (l) equal to the current local frame counter state with a first data frame DF (1), within a time equal to the first displacement value DCOl. downlink channel of the current local box counter state LFC Bs? (n) from the first series. Subsequent data tables DF (2) -DF (4) are numbered ti (2) -ti (4) according to their order in relation to the first data table DF (1) by increasing the number of tables ti ( 2) -ti (4) once every T f seconds. When the radio network control node has indicated that the second sector must be included in the active set, the mobile station is instructed by the radio network control node to measure a frame displacement value O fi2 between its channel of the current downlink DCH1 and the second common downlink control channel CDCH2. The measured value 0 2 is then reported to the radio network control node which calculates a second timing advance value TA2 for the second downlink channel DCH2 as the duration T f of a data frame minus the offset value of O fi2 box, that is, TA2 = T f - 0 n2. Subsequently, a second downlink channel offset value DC02 is set for the common downlink control channel offset CC02 to the second downlink channel DCH2 plus the second timing advance value TA2 plus one factor and times the duration T f of a data box, that is, DC02 = CC02 + TA2 + i • T f, where i is a positive, negative, or equal to zero integer, which is chosen in a value_ that minimizes the modulus of the difference I DCOl - DC02 | min, between the first downlink channel offset DCOl and the second downlink channel offset DCOl. In addition, to improve the synchronization between the first downlink channel DCH1 and the second downlink channel DCH2, the first downlink channel offset value DCOl can now be calculated again as DCOl = CCOl + TAI, ie the sum of the last common downlink control channel shift value CCOl, reported from the first base station BSl to the radio control node RNC1, and the timing advance TAI value for the first downlink channel DCH1 . As the first base station BC1 receives system box counter states from the radio network control node, so does the second base station BS2, where a second series of LFC BS2 local box counter states is generated ( n). Likewise, in the second base station BS2 each data frame DF (1) -DF (4) is associated with a particular frame number t2 (l) -t2 (4), which is derived from the second series of states of local box counter LFC Bs? ín). A first data frame DF (1) within a time equal to the second downlink channel offset value DC02 of the current state of local frame counter LFC BS2 (n) of the second series receives a first frame number t2 ( l). Subsequent data tables DF (2) -DF (4) are numbered t2 (2) -t2 (4) in accordance with their order in relation to the first data table DF (1) by increasing the number of table t2 ( 2) -t2 (4) every Tf seconds. By setting the second downlink channel offset value DC02 in such a way that the modulus of the difference I DCOl-DC021 min, between the first downlink channel offset DCOl and the second channel offset DC02 is minimized, it is ensured that the current data frame number tl (l) of the first downlink channel DCH1 is optimally aligned with a corresponding data frame number t2 (l) of the second downlink channel DCH2. Once the data frame numbering in the second downlink channel DCH2 with the data frame numbering in the first downlink channel DCH1 is synchronized, it can start the transmission of data frames DF (1) -DF (4) to the mobile station in the second downlink channel DCH2. A corresponding synchronized numbering of frame data is evidently carried out at the base station to RNC connections in the uplink section, that is, when the data packets are transmitted from a mobile station in a link channel ascending, through one or several sectors and one or several base stations. Each base station then associates a frame number with each data frame transmitted from the base station to the radio network control node in the uplink section, which is equal to the frame number of a link channel corresponding descending for this particular connection. A separation unit in the radio network control node stores copies of the received data packets and carries out a procedure of diversity in data packets that have been transmitted in data boxes of identical designation. The exact measurements taken during this procedure will be described in more detail below in the disclosure, particularly with reference to FIGS. 7 and 8. FIG. 5 shows a flow chart in accordance with the method of the present invention for synchronizing all asynchronous base stations, connected to a specific central node. In a first step 500, a timer variable t is set to zero. A current SFC system box counter status is sent from the central node RNC to all its base stations BSs connected in a second step 510. In a next step 520 the local box counter state LFC is aligned in each of the base stations with the SFC system box counter status. Each base station connected to the central node RNC measures in the following step 530 a respective common downlink control channel shift CCOl between its local frame counter LFC Bs? LFC Bs2 state and its common downlink control channel CDCH1, CDCH2. The results of the measurements are reported to the central node RNC, where the downlink channel offsets are calculated. Then, in step 540, it is tested whether the timer variable P is equal to a predetermined value T, and if so, the flow returns to the first step 5O0. Otherwise, the flow remains in step 540 until the timer variable T is equal to the predetermined value T. Therefore the predetermined value T establishes the frequency at which the LFC local box counter states will be updated from of the SFC system box counter status. Figure 6 shows a flowchart in accordance with an embodiment of the present invention for establishing a connection between the stationary part of the cellular radiocommunication system and a particular mobile station MS2. In a first step 600 it is asked if communication with a mobile station is requested within the area of responsibility of a given central node RNC, and if it is the case, the flow proceeds to the next step 610. Otherwise, the flow returns to the first step 600 again. An active set AS is defined for the mobile station MS2 in step 610. The active set specifies at least one uplink channel and a downlink channel for the mobile station MS2 within at least one sector, which is served by a base station connected to the central node RNC. In the next step 620 a TA timing advance value is established for the downlink channel or the downlink channels, which provides the most uniform time distribution of the network and channel resources, when the connections are already in progress within the system are taken into account. In step 630, below, for each downlink channel, in the active set AS, a downlink channel offset value DCO is calculated as the sum of the common control channel offset CCO and the time advance value TA . Finally, in step 640, a specific frame number FN is assigned to each data frame DF in the downlink channel or in the downlink channels in the following manner. An initial data frame DF, which starts the downlink channel offset value DCO after the current local box counter state receives a frame number equal to the next state of the local frame counter of the serving base station to the sector in question. The subsequent DF frame data receive FN frame numbers in accordance with their order in relation to the initial DF data frame by increasing the frame number once each Tf seconds. A flowchart in accordance with an embodiment of the present invention for initiating communication with a mobile station through a second sector, which is already communicating information through a first sector is shown in figure 7. Said conversation start through an additional sector is equivalent to adding a new sector to the non-empty active set for the mobile station MS. In a first step 700 a mobile station MS (for example, the second mobile station MS2 in Figure 1) is communicating data packets DPs in numbered data frames DF f, through at least one downlink channel and an uplink channel. The mobile station MS regularly measures the pilot signal strengths for sectors specified in the active set AS and for a neighboring sector and reports the results to the central node RNC (for example, the first radio network control node RNCl in figure 1). ). In the downlink section of the communication data packets DPs are separated in the service base station or in the service base stations, until the data packets DPs can be sent to the mobile station MS in a transmission channel. downlink in a data frame having a frame number indicated by the radio network control node RNC1 and in the uplink section of the connection there are separate data packets DPs in the central node RNC, after which is carried out a diversity procedure in data packets DPs that come in data boxes DFs with direct frame numbers. The separation limit in the base station or in the base stations depends on the downlink channel value DCO and a transmission timing from the radio network control node RNCl for the downlink channel or the link channels falling. A DP data packet, arriving too late to be sent in a data box DF, indicated by the radio network control node RNC1 is discarded at the base station. A similar separation restriction exists for the uplink channels in the central node RNC. The central node performs a diversity procedure _either when all copies of a particular data packet DP have arrived, or after a predetermined time tau. The determined time tau can be established by several different factors, for example, maximum available delay in the system, the characteristics of ATM containers used or the frame synchronization procedure. The diversity procedure in turn is carried out in accordance with one of two principles. Either it involves the selection of the DP data packet with the highest quality or it means the combination of signal energies of all the received copies of a DP data packet. The expiration of the predetermined time tau can obviously force the central node to carry out a macrodiversity in less than all of the copies of a DP data packet. In a step 710 it is investigated at regular intervals whether or not the active set AS must be updated, and if the answer is no, the flow returns to the first step 700. However, if the active set must be updated (for example, by adding sector S21 to the active set for the second mobile station MS in Figure 1), step 720 follows. In this step the mobile station MS receives instructions in the sense of measuring a frame shift value O fi2 between a downlink channel currently specified in the active set AS (for example DCH1) and the common downlink control channel for the ASU candidate sector (for example CDH2). The frame displacement value O fi2 is reported to the central node RNC. The active set AS is then updated with the new sector or the new sectors in the next step 730 and in the next step 740 a downlink channel is assigned in the new sector for transmission of information to the mobile station MS. In the next step 750, a timing advance value TA for the new downlink channel is calculated in the central node RNC as the duration of a data frame T f minus the displacement value of frame O fi2- The central node RNC also calculates a DCO downlink channel offset for the new downlink channel (i.e., as the DF data frames of the new downlink channel will be numbered in relation to the local frame counter states in the base station serving the new sector) as (1) the common downlink control channel offset between a series of local box counter states in the base station, which serves the second sector and the common downlink control channel in this sector plus (2) the timing advance value for the new downlink channel plus (3) an integer times the duration T f of the data frame DF where the integer is set to a value (positive, negative or zero), which minimizes the modulus of the difference between the link channel offset downstream of the DCOl channel in the active set AS and the downlink channel offset of the DC02 channel to be included in the active set AS (ie | DCOl - DC02 | mln.) The advance timing value TA c debug and downlink channel offset DCO are set for the new channel in the active set AS in the next step 760 and in the last step 770 is a specific frame number FN, assigned to each data frame DF of the new channel of downlink, giving an initial data frame DF in the new downlink channel within half the duration T f of a data frame DF, starting from the downlink channel offset value DCO after a current local box counter state, an initial frame number FN equal to the next local box counter state. Each subsequent data frame DF receives an integer increment of this initial frame number FN equal to the order of each respective data frame DF in relation to the initial data frame DF. The procedure then returns to the first step 700. A rule of conformance with an embodiment of the present invention for communicating an in-frame information in a cellular radio communication system appears in a block diagram in Figure 8. A central node in the form of a radio network control node RNC1 is here connected to a first base station BSl and a second base station BS2, through, for example, ATM connections. The radio network control node RNC1 comprises a clock unit 805, which generates a reference clock signal CK R that synchronizes all other units within the RNCl node. The clock unit 805 is in turn activated by a time reference signal TR from a reference time generator 860, which is a GPS-receiver or a similar device for indicating time with sufficient accuracy. A master timing unit 810 in the RNC1 node generates SFC system table counter states, which are sent through dedicated and separate connections 850, 890, as frame number references to the base stations BS1 and BS2. The base stations BS1, BS2, each include 1 clock unit 830, 860 to synchronize all other units within the base station BS1, BS2, via a clock signal CK1, CK2. Each base station BSl, BS2 also comprises a timing unit 835, 865 from which a first series of local frame counter states LFC Bs? and a second series of local frame counter states LFC BS2 to a transceiver unit 840, 870. In order to estimate a one-way delay D i, D 2 experienced by the DP data pays, when they are communicating between the central node RNC1 and the base stations BS1 and BS2, respectively, is supplied forward and backward with a round trip delay message RTD lr RTD 2 between the central node RNC1 and each specific base station BS1, BS2. An estimate of the one-way delay D i, D 2 is then calculated by subtracting an arrival time t a from the round trip message RTD i, RTD 2 of a corresponding sending time ts of the message RTD i, RTD2 and dividing the result by two, ie D i = (t a? - t s?) / 2; D i = (t a2 - t 32) = (t a2 - t a2) / 2. In order to obtain a more reliable estimate of the delay of a direction Di, D2, a number P (where, for example, P ** = 10) is made of calculations of this type, from which a delay of one sense D lr D2 average. Naturally, there are alternative forms of filtration which can be applied in order to estimate the delay of a direction Di, D2. The round trip delay message RTDi, RTD2 may also be combined or included in an SFC system table counter message from the central node RNCl. The RTDi, RTD2 round trip delay message may originate either at the base station BS1, BS2 or from the central node RNC1. If the round trip delay message RTDi, RTD2 is sent from one of the base stations BS1, BS2, a compensation for the one-way delay is also carried out in the base station BS1, BS2, by the adjustment of the state of the LFC frame controller Bs ?, LFC Bs2 in accordance with the state of the SFC system box counter plus the one-way delay Di, D2, that is, LFC Bs? = SFC + Dx; LFC Bs2 = SFC + D2. On the contrary, if the round trip delay message RTDi, RTD2 originates at the central node RNCi, the one-way delay Di, D2 is compensated in this mode, advancing the transmission of each SFCi, SFC2 status message in time from SFC system box counter to each respective base station BS1, BS2, a time equal to the delay of an estimated direction Di, D2, ie, such that SFCi = SFC-Dx; SFC 2 = SFC - Oz. A master control unit 815 is used to calculate the timing advance values TAI, TA2 and downlink channel offset values DCO1, DC02 to be used in the base stations BS1, BS2 while communicating data packets TPs in frames of numbered data in the downlink channels DCH1 (DPs); DCH2 (DPs). However, the master control unit 815 also determines when to update the active set for a particular mobile station MS2 either by adding or subtracting one or more sectors from the active set. A diversity transfer unit 820 handles information communication during transfer procedures as well as during normal communication, i.e., sends and receives DP data packets.

In case of real-time voice communication with a mobile station MS2, the information s is received from the central parts of the network through a voice coder / decoder and is sent to the central parts of the network through from the same voice encoder / decoder. If other types of data are communicated, the information passes either through an alternative encoder / decoder or communicates in an uncoded manner. Information divided in the form of data packets DPs is supplied from the diversity transfer unit 820 in a switching unit 825 to the base stations BS1, BS2 and data packets from the base stations BS1, BS2 are passed to the diversity transfer unit 820 through the switching unit 825 and a separation unit 880. The separation unit 880 is employed when a diversity procedure is performed on copies of data packets received DPs. The separation unit 880 stores data packets DPs up to a predetermined time, which is determined for example by means of a maximum allowable delay in the system, the characteristics of the ATM links used between the radio control node RNCÍ and the base stations BSl , BS2. After the expiration of the predetermined time, the diversity procedure is carried out on the currently available copies of a particular DP data packet. The diversity transfer unit 820 also receives frame shift values Ofi2, which are included in the DP data packets and reported from the mobile station MS2, through the base stations BS1. The frame shift values Ofi2 are passed to the master control unit 815 as an input to calculate the timing advance values TA2. The transceiver unit 840, 870 in the base station BS1, BS2 receives data packets DPs from the mobile station MS2 in an uplink channel UCH1 (DPs); UCH2 (DPs) and transmit DP data packets to the mobile station MS2 in a downlink channel DCH1, DCH2. The data packets DPs are sent to the radio network control node (RNCÍ through the switching unit 825 and data packets DPs are received from the radio network control node RNCÍ through the switching unit 825 and a "separation unit 855, 875. The separation unit 55, 875 stores the data packets DPs until a packet of data DP can be sent to the mobile station MS2 from the first base station BS1 and the second base station BS2 in a downlink channel DC1, DC2, in a data frame having a frame number indicated by a radio network control node RNCl A DP data packet arriving too late to a particular base station BS1, BS2 to meet this requirement is discarded In addition, the transceiver unit 840, 870 measures a common downlink control channel offset CCO1, CC02 between its local box counter LFC BSI, LFC Bs2 , and its common downlink control channel CDCH1, CDCH2. The results of the measurements are reported to the master control unit 815 at the central node RNCl, through the timing unit 835, 865 and the switching unit 825. A timing control unit 845, 885 at each base BS1, BS2 receives the timing advance value TAI, TA2, and the downlink channel offset value DCO1, DC02, from the master control unit 815 at the central node R? C1, through the switching unit 825. The timing control unit 845, 885 regulates the operation of the transceiver unit 840, 870 through a control signal Id z? such that each DP data packet received and transmitted through an air interface is associated with a correct frame number. The invention is primarily intended for use in a CDMA cellular radio communication system, but the method of the present invention and the arrays of the present invention can obviously be applied to any type of cellular radio communication system, regardless of how the radio resources are divided among the individual users of the system. The common downlink control channels, the downlink channels and the uplink channels can therefore be distinguished from each other through code division, a combination of code division and frequency, a code division combination and time, or a combination of code division, frequency and time of the radio spectrum.

Claims (1)

1. CLAIMS A method in a cellular radio communication system (100), arranged to communicate data frame information (DF) of a predetermined duration (Tf), comprising at least one central node (RNCÍ, RNC2), and at least one asynchronous base station (BS1-BS5), to synchronize all base stations (BS1, BS2), which are connected to a particular central node (RNCY), characterized in that it comprises the steps of: (510) sending a system table counter (SFC) status from central node (RNCÍ) to all its connected base stations (BSl, BS2), (520) align in each of the base stations (BSl, BS2) a respective local box counter state LFC BSI LFC BS2) with. the state of the system table counter (SFC), and because the status of the system table counter (SFC) is incremented by a tick after each course of a data frame (DF), and because each data frame ( DF) receives a frame number (ti (l) -tl (4); t2 (l) - t2 (4)) from a respective local frame counter (LFC BS ?, LFC Bs2) • A compliance method with claim 1, wherein each of the base stations (BS1-BS5) has at its disposal at least one common downlink control channel (CDCH1, CDCH2), characterized in that it comprises the steps of: (530) in each one of the base stations (BSl, BS2) measuring a common downlink control channel offset value (CCOl, CC02) between the local box counter states (LFC BS?; LFC BS2) and the channel of common downlink control (CDCH1, CDCH2), where the local box counter state (LFC Bs ?, LFC BSS) is incremented at a correlated speed with the tick speed of the system table counter (SFC), Y (530) reporting the common downlink control channel offset values (CCOl, CC02) to the central node (RNCÍ). A method according to claim 1 or according to claim 2, characterized in that an update of the system table counter (SFC) status is sent at regular time intervals (T). 4. A method according to any of claims 1-3, characterized in that a one-way delay (D i, D) is determined for each connection between the central node (RNCÍ) and all its connected base stations (BSl, BS2), and because the one-way delay (Di, D2) is compensated. A method according to claim 4, characterized in that the one-way delay (Di, D2) is calculated through a procedure comprising the consecutive steps of: sending a round trip delay (RTDi) message between the central node (RCNl) and a given base station (BSl), calculate a difference between a time of arrival (ta), and a corresponding delivery time (ts) of the round trip delay message (RTDi) and divide the result between two, repeat the two previous steps a predetermined number of times (p) and average the results (p) received in the previous step. A method according to claim 5, characterized in that a round trip delay message (RTDX) originates from a base station (BSl, BS2). A method according to claim 6, characterized in that the one-way delay (Di, D 2) is compensated in each of the base stations (BSl, BS2) by setting the local box counter status in accordance with: LFC BSX = SFC + DX where LFC BSX indicates a respective state of the LFCBs local box counter states? or LFCBs2, whose resolution is a fraction of a tick (preferably a tick / day) SFC refers to the "switchboard state of the system and Dz refers to the delay of a direction Di or D2. according to claim 5, characterized in that the round trip delay message (RTDi) originates from the central node (RNCÍ) 9. A method according to claim 8, characterized in that the one-way delay (Di , D2) is compensated at the central node (RNCÍ) by forwarding the transmission time of each system table counter (SFCX) status message to the connected base stations (BSl, BS2) in accordance with: SFCX = SFC - Dx where SFCX indicates a system table counter message sent to a particular base station (X = l; BSl, X = 2; BS2), SFC indicates the status of the system box counter and Dx indicates a delay of one direction Di or D2. A method in a cellular radio communication system (100) comprising at least one central node (RNCÍ, RNC2) connected to at least one asynchronous base station (iBSl-BS5), where each one serves at least one sector (S11-S56), each of which is associated with a certain common downlink control channel (CDCH1, CDCH2), where the base stations (BS1-BS5) communicate information with mobile stations (MS1-MS4) ), the information is divided into data packets (DP), which are transmitted in data frames (DF) in downlink channels (DCH1, DCH2) through one or several sectors (S23, S24) to a mobile station (MSl-MS4), ~ and in uplink channels (UCH2) from a mobile station (MS1-MS4) through one or more sectors (S23, S24), _ to establish a connection between the particular mobile station (MS2) and at least one base station (BS1), by using the synchronization method according to any of claims 2-8, characterized in that it comprises the steps of: (610) defining for the mobile station (MS2) an active set (AS) in which specifies at least one downlink channel (DCH1) and one uplink channel (UCH2), _ (620) for each downlink channel (DCH1) in the active set (AS) to set a timing advance value (TAI) ), which indicates a shift between the common downlink control channel (CDCH1) and the specific downlink channel (DCH1), (630) for each downlink channel (DCH1) in the active set (AS), calculate a downlink channel offset (DCOl) as a sum (CCOl + TAI) of the common downlink control channel offset (CCOl) and the timing advance value (TAI), (640) assign a specific frame number (tl (l) - tl (4)) to each table of data (DF (l) -DF (4)) in each of the downlink channels (DCH1), giving the initial data frame (DF (1)) a first number (t (l)) and each frame following data (DF (2) - DF (4)) an integer increment (ti (2), ti (3), t2 (4)) of this number (tl (l)) equal to the order of each corresponding data frame (DF (2) -DF (4)) in relation to the initial data table (DF (i)). A method in a cellular radio communication system (100) comprising at least one central node (RNCÍ, RNC2), connected to at least one asynchronous base station (BS1-BS5), each serving at least one geographic sector ( S11-S56) each of which is associated with a certain common downlink control channel CDCH1, CDCH2), where the base stations (BS1-BS5) communicate information with mobile stations (MS1-MS4), the information is divides into data packets (DP), which are transmitted in data frames (DF) on downlink channels ^ (DCH1, DCH2) through one or more sectors (S23, S24) to a mobile station (MS1-MS4) and uplink channels (UCH2) from a mobile station (MS1-MS4) through one or several sectors (s23, _s24), to initiate communication through at least a second sector (S21) with a particular mobile station (MS2), which is already communicating information through at least a first sector (S14), specified in an active set (AS) for the mobile station (MS2), by using the method according to any of the claim 2 -8, characterized in that it comprises the steps of: (720) measuring at least one frame shift value (Ofi2) between a downlink channel (DCH1) in the active set (AS) and a second common downlink control channel (CDCH2), associated with the second sector (s21), not included in the active set (AS) ), (720) report the value of frame shift (O £ - fi2) to a central node (RNCÍ), "^ (730) ^ update._ the active set__ (AS) through the;; - - "adding the second" sector "(s21), 5 (750) calculating a timing advance value (TA2) and a downlink channel offset value (DC02) for at least one second downlink channel (DCH2) in the second sector (s21), 2"(760) establish the., Shift between the 0 data frames (DFs) transmitted in the second downlink channel (DCH2) and the second link control channel -, descending cp aun. "(CDCH2) equal to the timing advance value (TA2)," .. "" * * * (770) assign a specific frame number (t2 (l) -5 t2 (4)) to each data frame ( DF (1) -DF (4)) in the second downlink channel (DCH2), providing a data frame (DF (1)) after a current local box counter state from the second series of Local frame counter states (LFC BS2 (n)), a frame number 0 (t2 (2)) equal to a following state of the local frame counter from this series and to each frame , '~ .. "data, subsequent. (DF _ (2) -DF (4)) a whole increment (t2 (2) -t2 (4)) "of this frame number. (t2 (1)) equal to the order of each respective data frame (DF (2) -DF (4)) in relation to the Initial data box (DF (1)). A method according to claim 11, characterized in that the calculation (750) was carried out in accordance with: TA2 = Tf - Ofi2 where TA2 refers to the timing advance value, Tf refers to the duration of a frame of data (DF) and O fi2 refers to the frame shift value Y DC02 = CC02 + TA2 + i • Tf where DC02 refers to a downlink channel offset for the second downlink channel (DCH2), that is, how data frame (DF) of the second downlink channel (DCH2) are numbered (t2 (l) -t2 (4)) in relation to the local frame counter states (LFCBS2 ( n) in the second sector (s21), CC02 refers to the value of the common downlink control channel offset between the second series of local frame counter states (LFC BS2 (n)) and the link control channel common descending (CDH2), TA2 refers to the timing advance value, i is an integer that is set to a value that minimizes the difference modulus (| DC01 - DC02 | m? n) between the frame number ( ti) given by the first downlink channel offset (DCOl) and the frame number (t2) given by the second downlink channel offset (DC02), and Tf refers to the duration of a data frame ( DF) 13. A method according to claim 12, characterized in that the displacement of the link channel The DLC1 for the first downlink channel (DCH1) is calculated again in accordance with: DCOl = COOl + TAI where CCOl is the last common downlink control channel offset value between the first series of downlink states. local frame counter (LFCBS? (n)) and the first common downlink control channel (CDCH1) reported from the first base station (BSl) to "the central node (RNC1 TAI is equal to the forward value for the first 'downlink' channel (DCH1). 14. A method according to any of claims 10-13, characterized in that during the information downlink communication, data packets (DP) are separated (B) in each of the base stations (BSl, BS2 ) until the frame number for the data frames transmitting each specific data packet (DP (1) - DP (4)) corresponds to a frame number (tl (l) - ti (4); t2 (1) ) - t2 (4)) in the respective downlink channel (DCH1, DCH2). A method according to claim 14, characterized in that the separation (B) maintains data packets (DP) up to a maximum number and because a data packet (DP) is discarded if it arrives too late at a base station (BSl, BS2), to comply with the frame number ^ in the respective downlink channel (DCH1, DCH2) indicated by the central node (RNCÍ). A method according to any of claims 10-15, characterized in that during the information uplink communication, data packets (DP) are received in the base stations (BS1, BS2) in data frames (DF), being numbered (ti (1) -ti (4), t2 (l) -t2 (4)) in relation to a frame numbering of the downlink channels (DCH1, DCH2) indicated by the central node (RNCÍ) and because a diversity procedure is carried out at the central node (RNCÍ) in data packets (DP), which are sent in data frames (DF) having identical numbers. A method according to claim 16, characterized in that the diversity procedure is carried out when all the copies of a given data packet (DP) have reached a central node (RNCÍ), but not later than a time ( tau) after the arrival of a first copy of the data packet (DP). . A method according to claim 17, characterized in that the diversity method is selective, that is, a data packet (DP) having the highest alt quality is selected to represent the reported data. . A method according to claim 17, characterized in that the diversity method is combination, that is, the contents of all data packets (DP) are combined to form a representation of the reported data. . A method according to any of claims 1-19, characterized in that the central node (RNCÍ, RNC2) is a radio network control node. . A method according to any of claims 1-20, characterized in that the common downlink control channels (CDCH1, CDCH2), downlink channels (DCH1, DCH2) and ascending channel (s) (UCH2) They are distinguished from each other through - either (A) a code division of the radio spectrum, (B) a division of code and frequency of the radio spectrum (C) _ a division of code and time of the radio spectrum, or (D) a combination of code division, frequency and time of the radio spectrum. 22. An arrangement method for communicating information in frame ^ in a cellular radio communication system (100) comprising at least one central node (RNCÍ), which is connected to at least one asynchronous base station (BSl, BS2) through which data packets (DPs) are transmitted in downlink channels (DCH1, DCH2) and uplink channels (UCH1, UCH2) with mobile stations (MS2) and where control signals are transmitted in link control channels common downstream (CCOl, CC02) to the mobile stations (MS2), characterized in that the central node (RNCÍ) comprises a master time-out unit (810) to generate system table counter (SFC) states sent to the stations of base (BS1, BS2), a master control unit (815) for i.a. calculate timing advance values (TA) and downlink channel offset values (DCOl, DC02) to be employed while communicating data packets (DPs) in numbered data frames (DF) in the downlink channels ( DCH1, DCH2), a diversity transfer unit (820) for executing simultaneous communication through more than one base station (BS1, BS2) with a particular mobile station (MS2) and because the respective base station (BSÍ, BS2) comprises a timing unit (835, 865) to receive the states of the system table counter (CFS) and to generate local frame counter states (LFC BS?; LFCBSS), said counter states of system box (SFC) are increased by a tick for each data box (DF), where each data frame (DF) receives a frame number (tl (l) - ti (4); t2 (1) -t2 (4)) from a respective local frame counter state ( LFC Bs ?; LFC BS2). An arrangement according to claim 22, characterized in that the central node (RNC) further comprises a clock generator (805) for synchronizing all other units included in the radio network control node (RNC), a generator of reference time (860) which provides an absolute time reference (TR) which is used by the master timing unit (810) and a switching unit (825) to alternately connect the diversity transfer unit (820) ) to, a ^ base station specified between the base stations (BS1, BS2). A jar according to claim 23, characterized in that the reference time generator (860) is a GPS receiver. An arrangement according to any of claims 22-24, characterized in that each of the base stations (BS1, BS2), comprises a clock generator (830, 860) for synchronizing all other units in the base station ( BSl, BS2), a transceiver unit (840,865) for communicating data packets (DPs) in numbered data frames (DF) and for measuring offset values (CCOl, CC02) between the local box counter states (LFC Bsi) / LFC Bs2) and the common downlink control channels (CDCH1, CDCH2), and a timing control unit (845,885) to receive the timing advance values (TAI, TA2) and channel shift values of downlink (DCOl, DC02) and to control (ll f I2) the I transceiver unit (840, 870). An arrangement according to any of claims 22-25 characterized in that at least one particular and separate connection (850, 890) is dedicated for the transmission of the system table counter (SFC) states from the central node (RNCÍ) ) to each of the base stations (BS1, BS2). A method according to claim 26, characterized in that each of the particular and separate connections (850, 890) is compensated by a one-way delay (Di, D2) between the central node (RNCÍ) and each respective base station. (BSl, BS2). A method according to any of claims 22-27, characterized in that each of the base stations (BS1, BS2), comprises a first "separation" unit (855, 875) for separating data packets (DPs), which have been transmitted from the central node (RNCÍ). ~~~ A method according to claim 28, characterized in that an output of the first separation unit (855, 875) is connected to the transceiver unit (840, 870). A method according to any of claims 22-29, characterized in that the central node (RNCÍ) comprises a second separation unit (880) for separating data packets (DPs), which have been transmitted from the stations base (BS1, BS2) A method according to claim 30, characterized in that an output of the second separation unit (880) is connected to the diversity transfer unit (820).