WO1996007284A1 - Systeme et reseau cellulaire de telecommunications - Google Patents

Systeme et reseau cellulaire de telecommunications Download PDF

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Publication number
WO1996007284A1
WO1996007284A1 PCT/AU1995/000561 AU9500561W WO9607284A1 WO 1996007284 A1 WO1996007284 A1 WO 1996007284A1 AU 9500561 W AU9500561 W AU 9500561W WO 9607284 A1 WO9607284 A1 WO 9607284A1
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WIPO (PCT)
Prior art keywords
channels
frequencies
cellular telecommunications
cell
cells
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PCT/AU1995/000561
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English (en)
Inventor
Maxim Vladimirovich Gitlits
Original Assignee
Telstra Corporation Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Telstra Corporation Limited filed Critical Telstra Corporation Limited
Priority to AU33761/95A priority Critical patent/AU3376195A/en
Publication of WO1996007284A1 publication Critical patent/WO1996007284A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/12—Fixed resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • This invention relates to a cellular telecommunications method and network, and, in particular, a method for dynamically allocating communication channels in a cellular network.
  • co-channel interference refers to interference between signals from different cells which may be transmitting on the same carrier frequency.
  • Co-channel interference is a function of the distance between the interfering cells and the transmission power and direction of transmission from those cells. Clearly, if every cell in a cellular network were to use all available carrier frequencies then a large amount of co-channel interference would result, particularly between signals from adjacent cells.
  • a cellular network can be arranged into clusters of adjoining cells, such that the cells in a particular cluster each transmit on different carrier frequencies.
  • Each cell can be allocated a subset of carrier frequencies from the total number of available frequencies.
  • the cells in a single cluster may therefore collectively utilise all of the available frequencies, but since the adjoining cells within the cluster each use different carrier frequencies they do not interfere with each other.
  • the allocation of frequencies within a cluster can be arranged so that the frequencies in a cell of one cluster which is adjacent to a cell of another cluster do not interfere.
  • propagation conditions for the radio frequency signals are dependent upon the transmission frequency, and vary substantially from one carrier frequency to another.
  • a technique known as frequency hopping can be used to reduce the effects of frequency dependent phenomena, by periodically changing the transmission frequency for a channel in a particular cell. For example, if a cell has an allocation of three carrier frequencies then the transmitting base station can periodically switch between frequencies during transmission of a particular signal. Therefore, if one of the carriers is subject to poor propagation conditions during transmission of the signal then the signal quality for the channel is only affected one third of the time on average.
  • frequency hopping facilitates signal processing and diminishes the error probability after error correction decoding. It has been found that the signal quality which can be achieved increases if more frequencies are available for frequency hopping. Unfortunately, the total number of frequencies available in a cluster, and therefore in the network as a whole, is limited and the number of frequencies allocated to a given cell can only be a fraction of this amount.
  • a cellular telecommunications method for use in a cellular telecommunications network having at least one cluster of adjoining cells including: allocating respective control channel frequencies to said cells for transmitting a control channel in a cell; allocating at least one other different frequency to each cell; swapping between the frequencies allocated to said cells, except the control channel frequencies, for at least one traffic channel.
  • the present invention also provides a cellular telecommunications network having at least one cluster of adjoining cells, said cells each including: a first transceiver for transmitting a control channel in a respective control channel frequency; a second transceiver for transmitting at least one traffic channel at a different frequency allocated to the cell; and control means for controlling said second transceiver to swap between the frequencies allocated to said cells, except the control channel frequencies, for said at least one traffic channel.
  • the present invention further provides a a cellular telecommunications method having signals for transmission within a cell organised in time division multiplexed channels, said method including transmitting first channels utilising a first number of transmission frequencies, and transmitting second channels using a second number of transmission frequencies.
  • the present invention also provides a cellular telecommunications network including: a cluster of cells having a set of transmission frequencies; and a base station in each cell of said cluster adapted for transmission of signals on first channels within the cell using a first number of said frequencies and on second channels within the cell using a second number of said frequencies.
  • the present invention further a cellular telecommunications method for use in a cellular telecommunications network having at least one cluster of adjoining cells, said cells being allocated different respective sets of different transmission frequencies, said method including: intracell frequency hopping by swapping the allocated frequencies within said cells; and intercell frequency allocation swapping by swapping said sets of frequencies - 4 - between the cells.
  • the present invention also provides a cellular telecommunications network including at least one cluster having adjoining cells provided by corresponding base stations, said cells being allocated different respective sets of different transmission frequencies and the base stations having control means for controlling intracell frequency hopping by swapping the allocated frequencies within said cells, and controlling intercell frequency allocation swapping by swapping said sets of frequencies between the cells.
  • Figure 1 is a schematic diagram of a cellular telecommunications network
  • Figure 2 is a schematic diagram of a cluster of cells of the cellular network
  • Figures 3 A to 3C are tables showing transmission frequency allocation in a conventional cellular network cluster with equal number of frequencies in each cell;
  • Figures 4A to 4C are tables showing transmission frequency allocation in a conventional cellular network employing a cyclic slow frequency hopping (SFH) strategy;
  • Figures 5A to 5C are tables showing transmission frequency allocation according to a preferred embodiment for the case of equal number of frequencies in each cell and cyclic slow frequency hopping;
  • Figure 6 is a diagram of transmissions in a GSM digital cellular network
  • Figure 7 illustrates mapping of logical channels to physical channels in a GSM network using neither SFH nor frequency allocation swapping (FAS);
  • Figure 8 illustrates mapping of logical channels to physical channels in a GSM network using cyclic SFH but not FAS;
  • Figure 9 illustrates an example of mapping of logical channels to physical channels in a network employing cyclic SFH together with cyclic FAS according to a preferred embodiment
  • Figures 10A and 10B show two clusters in a GSM network to illustrate the swapping of carrier frequencies between cells in accordance with a frequency allocation swapping scheme
  • Figure 11 is a table of carrier frequency allocations in cell A of the network in Figure 10A using SFH;
  • Figure 12 is a table of carrier frequency allocations in the network of Figure 10A utilising frequency allocation swapping amongst cells in a cluster according to a preferred embodiment
  • Figure 13 illustrates channel distribution in TDMA frames for three carriers in a cell with various combinations of SFH and FAS according to another preferred embodiment
  • Figure 14 is a table of transmission characteristics for various combinations of
  • Figure 15 is a graph of quality of service against distance for various combinations of SFH and FAS.
  • Figure 16 is a diagram of SFH and FAS for the consecutive frames generated by three transceivers of a base station.
  • FIG. 1 there is shown a diagrammatic representation of the geographical layout of a cellular telecommunications network 2 which comprises nine cells 6 organised into three clusters 4 of three cells each.
  • each cell is considered to have a regular hexagonal shape, and the three cell clusters 4 each comprise three adjoining cells in a cloverleaf shape.
  • each cell in the network would be provided with one or more carrier frequencies exclusively for use in that cell.
  • only a limited bandwidth in the electromagnetic spectrum is allocated by regulatory bodies for use in cellular telecommunications. Therefore, to allow for growth, both in terms of geographical area and the number of cells in a network, to cope with increasing communications traffic and to take advantage of the limited transmission power of cellular base stations, frequency reuse strategies are often employed.
  • a frequency reuse strategy involves allocating the same transmission frequencies to a plurality of cells in the network. An important consideration then becomes the minimisation of co-channel interference brought about by transmissions from different cells on the same frequency interfering with each other.
  • the simplest way to reduce co-channel interference is to ensure that the distance between cells using the same carrier frequencies (the "reuse distance") is as large as possible.
  • reuse distance the distance between cells using the same carrier frequencies
  • the idea of reuse clusters can be applied, wherein a cluster comprises a group of adjoining cells in which no two cells in the group are allocated the same carrier frequencies.
  • a reuse cluster topography it is assured that the closest cell utilising the same carrier frequencies is at least as far away as the next cluster.
  • cells with omnidirectional base station antennas were deployed, typically in reuse clusters of 12 cells.
  • each of the nine cells 1-1 to 3-3 shown in Figure 1 would be allocated only one of the available carrier frequencies fi to fo. This scheme would result in no co-channel interference since each frequency is used only once in the network, but certain cells may experience detrimental multipath fading or other frequency dependent effects, whilst other cells may not.
  • the network 2 is divided into clusters 4 of cells 6, resulting in three clusters of three cells each.
  • the cluster 4 shown in Figure 2 illustrates one way in which the available frequencies f j to o could be allocated in the cluster, with each cell allocated three separate carrier frequencies. In general, the number of frequencies in each cell may not be equal. Each frequency would then be used by one cell in each cluster, with the frequency allocations within the clusters being arranged so that the cells of neighbouring clusters using the same frequencies are as spatially distant as possible.
  • Figures 3A, 3B and 3C are tables of allocation of carrier frequencies to three communications channels in each of the cells 1 to 3 in Figure 2. As can be seen, each channel is allocated a single transmission frequency for the duration of the channel signal.
  • 4A, 4B and 4C show a way in which slow frequency hopping could be implemented in the cluster of Figure 2, wherein each channel is transmitted on each of the carrier frequencies available in that cell, in a sequential manner.
  • the advantages gained by swapping carrier frequencies during transmission thereof are greater if more frequencies are used for each channel.
  • the frequency allocation scheme of the invention provides for intercell frequency swapping as well as, or in place of, intra cell frequency swapping.
  • frequencies can be swapped between cells within a cluster in addition to between channels within a cell. In this way each channel may in fact be transmitted, in sequential portions, using all of the available network carrier frequencies, rather than only a fraction of them depending on the frequency reuse cluster size.
  • Tables 5A, 5B and 5C show an example of how frequency allocation swapping can be achieved, based on the example network described previously.
  • cell 1 of the cluster under consideration is initially allocated frequencies f,, f 2 and f 3 , as in the examples shown in Tables 3 A and 4 A.
  • the channels are swapped between the three frequencies during the course of a cyclic slow frequency hopping period.
  • the frequency allocation of cell 1 is swapped with another of the cells in the cluster.
  • frequencies f 4 , f 3 and f 6 are swapped from cell 2 to cell 1
  • frequencies f 7 , f 8 and f 9 are allocated to cell 2
  • the frequencies f 1( f 2 and f 3 are swapped from cell 1 to cell 3.
  • the FAS cyclic period (number of SFH periods) of the frequency allocation swapping scheme corresponds to the number of cells in the cluster.
  • the frequency allocation swapping as between cells within a cluster is quite separate from the slow frequency hopping within a cell, and therefore there is no requirement for frequency allocation swapping to be linked to the cyclic frequency hopping period. Indeed it is possible to implement the present invention without the provision of intracell frequency swapping as well as vice versa as shown in Tables 4A to 4C. It will also be appreciated that the frequency allocation swapping method can be used in conjunction with other techniques used in cellular networks such as time division multiplexing of channels on a single carrier, or sectored cells utilising directional antennas to reduce co-channel interference for different number of allocated cell frequencies and different number of frequencies swapped in one time.
  • GSM Global System for Mobile communications
  • BS base station
  • MS mobile station
  • TDMA time division multiple access
  • the TDMA frames are transmitted on a carrier, the frequency of which is dependant upon the frequencies allocated to the particular cell in which transmission takes place, as well as whether a frequency hopping scheme is used between frequencies within the cell and whether frequency allocation swapping is used amongst cells within a cluster.
  • Logical channels refer to channels of communication on a point-to-point basis, i.e. from the base station 10 to one mobile station 12, such as traffic channels (TCH), or on a point-to-multipoint basis, i.e. from the base station 10 to several mobile stations 12, such as a broadcast control channel (BCCH).
  • Logical channels are multiplexed on the carriers in a cell by mapping them onto the physical channels of the TDMA frames.
  • the slow frequency hopping schemes described hereinabove can be thought of as a mapping of TDMA frame structures onto the RF carriers for the cell, whereas the frequency allocation swapping scheme of the invention can represent a mapping of carriers for each cell onto the various frequencies available within the cluster.
  • GSM base stations 10 and mobile stations 12 are further described in the applicant's co-pending International Patent Application No. PCT/AU94/00561, which is herein incorporated by reference.
  • the method of the preferred embodiment is executed by base stations 10 of the cells which have their controlling hardware and/or software adjusted to facilitate cyclic FAS and cyclic SFH as described hereinafter.
  • Figure 7 is a diagrammatic illustration of data for transmission in a cell having four carriers 18a, 18b, 18c and 18d allocated frequencies f lf f 2 , f 3 and f 4 , respectively, and which employs neither frequency hopping nor frequency allocation swapping.
  • the mapping of three logical channels (channel 1, channel 2 and channel 3) onto the physical channels represented by the timeslots 16 of the frames 14 for the carriers in the cell is illustrated by the shading of timeslots.
  • channel 1 is allocated timeslot number T 2 on carrier 18a which transmits on frequency f
  • each timeslot number T 2 in the TDMA frames transmitted on carrier 18a carries data from logical channel 1.
  • logical channels 2 and 3 are allocated timeslots on carriers 18b and 18c (carrier frequencies f 2 and f 3 respectively) although they could as easily be allocated to physical channels corresponding to other timeslots on the carrier 18a to take advantage of the time division multiplexing of the TDMA frames.
  • Figure 8 is a diagrammatic illustration of data for transmission in a cell which employs slow frequency hopping over carrier frequencies f j , f 2 and f 3 .
  • the frequency hopping is cyclic, with a cycle period of three TDMA frames. It can be seen, therefore, that in the first TDMA frame logical channel 1 is transmitted on frequency f t , in the second TDMA frame using carrier frequency f 2 , and in the third TDMA frame on frequency f 3 . In the fourth TDMA frame, logical channel 1 is again transmitted on the carrier utilising frequency f j .
  • Figure 9 shows one way of representing a cellular communications system in which both cyclic slow frequency hopping and frequency allocation swapping is employed by mapping logical channels onto physical channels.
  • the cyclic period for the SFH is three TDMA frames, whilst the cyclic period for the FAS scheme is three
  • carrier frequency allocations by GSM protocols. For example, in each cell in GSM there is one reserved carrier frequency in each cell, which is defined as the broadcast channel frequency (BCHF) and is the frequency on which the BCCH data are transmitted. On this carrier time slot T 0 is always used for the BCCH, and slow frequency hopping for this time slot is not permitted. The reason for this is that the mobile stations monitor the broadcast channels in surrounding cells and BCCH channel must be easily found. Also, a base transceiver station must transmit a burst in every time slot of every time frame in the downlink on the BCHF to allow mobiles to make power measurements of the radio frequency channels supporting the BCCH.
  • BCHF broadcast channel frequency
  • the broadcast channel frequency should be excluded from the frequency allocation swapping and the time slot T 0 on this carrier should be excluded from the slow frequency hopping.
  • Figure 10A represents two three-cell clusters in a GSM network, one cluster comprising cells A, B and C and the other cluster comprising cells A', B' and C.
  • the broadcast channel frequency for cells A and A' is frequency fo
  • for cells B and B' the BCHF is f 3
  • for cells C and C the BCHF is f ⁇ . Therefore, in order to comply with the GSM requirement for a broadcast channel in timeslot T 0 in each TDMA frame, the broadcast channel frequency must be available for use of the first timeslot of every frame.
  • the remaining available frequencies may be swapped at will between carriers within a cell and between cells within a cluster, and indeed the BCHF can be swapped as well so long as it is available at T 0 for each TDMA frame. This means that the various physical channels corresponding to different timeslots on the carriers in a cell may have different frequency hopping and frequency allocation swapping characteristics.
  • the arrows between cells A, B and C in Figure 10A show one way in which frequencies can be swapped within the cluster.
  • the BCHFs f ⁇ , f 3 and fg remain allocated in their respective cells whilst frequency fj is swapped from cell A to cell C, frequency f 7 passes from cell C to cell B, and frequency f 4 is swapped from cell B to cell A.
  • Figure 10B shows the next round of frequency swapping where the frequencies f 2 , f g and f 5 are swapped amongst the cells A, C and B.
  • the table shown in Figure 11 sets forth a scheme for slow frequency hopping in cell A of the GSM network shown in Figure 10A, wherein frequency f-, is the BCHF and frequencies f j and f 2 are the other two frequencies available for carriers in the cell.
  • frequency f- is the BCHF
  • frequencies f j and f 2 are the other two frequencies available for carriers in the cell.
  • At timeslot T 0 in each TDMA frame only frequencies f j and f 2 are available for slow frequency hopping for traffic channels since ⁇ is required for the broadcast control channel.
  • all three frequencies fn, f j and f 3 can be used for SFH of traffic channels to achieve better performance.
  • traffic channels which occupy time slots from T j to T 7 can have SFH over three carriers, while traffic channels which occupy time slot T 0 can have SFH over the two carriers f j and f 2 only, the BCHF frequency f f , being used to transmit BCCH data.
  • the BCHF frequency f f being used to transmit BCCH data.
  • the table shown in Figure 12 sets forth one way in which frequencies can be allocated amongst the cells in a cluster over the course of eight TDMA frames.
  • time slots from T 0 to T 7 can be allocated frequencies f detox f 2 , f 4 , f 5 , f 7 and f g and time slots from Tj to T 7 can also be allocated frequencies f ⁇ , f 3 and f ⁇ for traffic channels.
  • FIG. 13 An example of channel distribution in a cell with three carriers 18a, 18b and 18c is shown in Figure 13.
  • the broadcast channel frequency is f ⁇ , and in timeslots T 0 to T 4 the other two carriers 18b and 18c swap from f j and f 2 to fa, f 5 , f 7 and fg in consecutive order, as in Table 12.
  • Time slot T 0 at the frequency f ⁇ is used for the broadcast channel. Because every TDMA frame consists of eight time slots, 23 traffic channels can be organised in the cell with three carrier frequencies. Four out of seven traffic channels, which occupy time slots T] to T 4 at carrier fo, are arranged without frequency hopping.
  • For the transceiver for the carrier operating at frequency f o that BCHF will be present in every time frame for time slots T 0 to T 4 .
  • Figure 16 shows frames 50, 52 and 54 generated by the three carriers 18a, 18b and 18c, respectively, at four different time instants, t j , t 2 , t 3 and t 4 .
  • the first portions 56 of the frames 50 to 54 represent time slots T 0 to T 4 and the carrier frequencies allocated thereto, and the second portions 58 of the frames 50 to 54 represent the time slots T j to T 7 and the frequencies allocated thereto.
  • the time slots T 0 to T 4 of the first carrier 18a are always transmitted at the broadcast channel frequency f f ,.
  • Time slots T 0 to T 4 of the second and third carriers 18b and 18c cycle through the six available frequencies of a cluster, excluding the broadcast channel frequencies.
  • Time slots T 5 to T 7 also use the broadcast channel frequency of a cell, fg, and when one carrier is using f o , the other two carriers respectively use the other two carrier frequencies available in the cell at that time.
  • the swapping method is such that for one carrier, time slots T 5 to T 7 will use f o every third frame. Therefore although the time slots T 3 to T 7 are able to use seven frequencies in the cluster, effectively the benefit gained is the same as that gained by performing SFH over three frequencies because the broadcast channel frequency fo is used every third time frame.
  • channels 30 which remain at one carrier frequency (the BCHF), of which there are shown four traffic channels as well as the BCCH;
  • channels 32 which swap over six frequencies within the cluster (excluding the BCHFs for the cluster), of which there are shown ten traffic channels;
  • channels 34 which swap over three frequencies within the cell (including the BCHF for that cell), of which there are shown nine traffic channels.
  • the sets of channels in the cell under consideration for networks without FAS and with FAS is shown in the table of Figure 14.
  • the quantity Ec No relates to the ratio of the energy of an incoming signal to the power spectral density of noise in the signal, and is preferred in digital radio applications to a signal-to-noise ratio (SNR) measurement, since Ec/No values are independent of the receiver characteristics. It can be seen that by including frequency allocation swapping greater versatility is possible as compared with permanent channels allocation.
  • FAS provides the network with a set of channels with different demands of the signal-to-noise ratio (or the actual reference sensitivity level) for equal quality of service. Because the mobile stations are distributed over the cell at different distances from the base station and the propagation conditions for mobiles are highly different too, by providing a number of channels with different characteristics it is possible to assign a MS to an appropriate channel, giving channels with lower required Ec/No values to those MS that are situated in worse conditions.
  • the existence of a set of channels with different features creates some new possibilities in the intracell hand-over, with adaptive channel allocation depending on the change of traffic, MS positioning, propagation conditions, etc.
  • the channels distribution is not established permanently but can be changed dynamically, at every time frame.
  • the graph of Figure 15 shows a comparison between the quality of service available at various distances from the base station of a cell in the cases of no slow frequency hopping and no frequency allocation swapping, SFH without FAS, and with both SFH and FAS.
  • the minimum quality of service (QoS) for communications within the cell is also indicated.
  • the physical channel for each MS can be allocated dynamically according to the QoS required. For example, referring to Figure 15, a MS which is within a distance d j of the BS can be allocated a channel without SFH and without FAS and still obtain a QoS greater than the required minimum.
  • T j to T 4 of carrier £-, shown in Figure 13 is appropriate for such a MS, although any of the other timeslots 32 and 34 could also be used since they all provide a better QoS.
  • a mobile station at a distance between d j and d 2 will require at least one of timeslots 34, using SFH over three frequencies, for a minimum QoS although one of timeslots 32 could alternatively be employed if available.
  • Mobile stations further than a distance d 2 from the BS will generally require the best quality channel available, i.e. one of timeslots 32 using SFH and FAS to hop over six frequencies, in order to achieve the minimum QoS.
  • the quality of transmissions on a particular channel will depend not only upon the distance of the mobile station from the base station, but also upon propagation losses of another nature, such as shadowing by buildings, diffraction of carriers, etc.
  • the QoS (as indicated by the SNR or Ec/No) may be low even for a mobile station which is quite close to the base station. Therefore, the QoS can only be considered as a pure function of the distance from the base station ( Figure 15) in the case of radio wave propagation over free space.
  • the selection of a channel for communication with a particular mobile station be based on some measurement of signal quality characteristics between the mobile station and base station, rather than a measurement of the separation distance itself.
  • the base station measures every 480 msec a transmission parameter called "Received Signal Quality" (RXQUAL) which is expressed in terms of bit error rate (BER). Therefore, in implementing a system for channel allocation according to the present invention it is preferred to utilise the RXQUAL quantity in a threshold comparison to determine which class of channel should be allocated. If the BER of RXQUAL is higher than a given threshold then the mobile station should be allocated a channel with a lower required SNR value. Conversely, if the measured BER is lower than a given threshold then a channel with a higher required SNR is acceptable.
  • the number of channels of every class will depend on the number of carrier frequencies in a cluster (N). If the number of traffic channels utilising only one frequency in a cell is "n", then it can be shown that: the number of channels with SFH over all carriers available for swapping in the cluster is
  • n ⁇ 7. Changing "n”, it is possible to obtain the desired number of channels with better quality than in a network without frequency swapping.
  • signals transmitted from a base station to a mobile station utilise a different frequency band than signals transmitted from a mobile station to a base station (uplink).
  • Frequencies in each block are paired to form duplex carriers.
  • a system for swapping frequencies using SFH and/or FAS would involve both carriers in the duplex to comply with GSM protocols, however, it will be recognised that the above communications method is applicable also to the case where the duplex carriers frequencies are swapped independently and/or individually and that one of the uplink or downlink can employ SFH and/or FAS whilst the other does not.
  • SFH and FAS can also be implemented in a random manner as for random SFH.

Abstract

Système cellulaire de télécommunications destiné à être utilisé dans un réseau cellulaire comportant au moins un groupe de cellules contiguës. Le système est ainsi constitué: à chaque cellule est attribuée une fréquence de canal de commande propre afin d'émettre un canal de commande dans une cellule; un ensemble de fréquences est attribué au groupe, pour être utilisé par les cellules, chacune de ces dernières disposant d'un sous-ensemble correspondant de l'ensemble précité; le système consiste ensuite à naviguer entre les fréquences d'un sous-ensemble, à la recherche des premiers canaux de trafic d'une cellule (34) puis à naviguer entre les ensembles de fréquences à l'intérieur d'un groupe, à la recherche des deuxièmes canaux de trafic de la cellule (32). La fréquence de canal de commande est attribuée aux troisièmes canaux de trafic de la cellule (30). Les appels sont attribués sélectivement à l'un des canaux de trafic, sur la base des caractéristiques d'émission de l'appel. La qualité de service fournie par les deuxièmes canaux est supérieure à celle des premiers canaux, laquelle est à son tour supérieure à celle des troisièmes canaux. L'invention porte également sur un réseau cellulaire, en particulier sur un réseau GSM, comportant des stations de base conçues pour fournir un premier, un deuxième et un troisième canal de trafic par sauts de fréquence lents à l'intérieur d'une cellule et par échanges d'attribution de fréquences entre les cellules.
PCT/AU1995/000561 1994-08-31 1995-08-31 Systeme et reseau cellulaire de telecommunications WO1996007284A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU33761/95A AU3376195A (en) 1994-08-31 1995-08-31 A cellular telecommunications method and network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPM7809A AUPM780994A0 (en) 1994-08-31 1994-08-31 A method and apparatus for channel allocation in a cellular telecommunications network
AUPM7809 1994-08-31

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WO1999011084A1 (fr) * 1997-08-23 1999-03-04 Motorola Limited Dispositif et procede pour la transmission de donnees
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WO2001037454A1 (fr) * 1999-11-19 2001-05-25 Telefonaktiebolaget Lm Ericsson (Publ) Saut de frequence dans un systeme de communication compact gprs/gsm
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WO2003107702A1 (fr) * 2002-06-14 2003-12-24 Siemens Aktiengesellschaft Procede d'attribution de canaux pour une transmission de donnees utiles par l'intermediaire d'une interface radio entre une station radio emettrice et une station radio receptrice
WO2007051389A1 (fr) * 2005-11-04 2007-05-10 Huawei Technologies Co., Ltd. Procede et appareil reseau destines a ajuster les resssources de communication dans une communaute
WO2008054272A1 (fr) * 2006-10-30 2008-05-08 Telefonaktiebolaget Lm Ericsson (Publ) Agrégation accrue pour amélioration de positionnement
US8315632B2 (en) 2005-10-07 2012-11-20 Telefonaktiebolaget Lm Ericsson (Publ) Adaptive enhanced cell identity positioning
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