EP0789979A1 - Procede de transfert de cellule a cellule d'une communication etablie avec un mobile, dans un reseau cellulaire de radiocommunications - Google Patents
Procede de transfert de cellule a cellule d'une communication etablie avec un mobile, dans un reseau cellulaire de radiocommunicationsInfo
- Publication number
- EP0789979A1 EP0789979A1 EP95936601A EP95936601A EP0789979A1 EP 0789979 A1 EP0789979 A1 EP 0789979A1 EP 95936601 A EP95936601 A EP 95936601A EP 95936601 A EP95936601 A EP 95936601A EP 0789979 A1 EP0789979 A1 EP 0789979A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- current
- base station
- channel
- communication
- mobile
- Prior art date
- Legal status (The legal status 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 status listed.)
- Ceased
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000001413 cellular effect Effects 0.000 title description 4
- 238000004891 communication Methods 0.000 claims description 53
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 5
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 238000010200 validation analysis Methods 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
Definitions
- the present invention relates generally to a cell-to-cell transfer method of a communication established with a mobile in a digital cellular radiocommunication network with mobiles. Such a transfer is designated by "handover" in
- the invention relates to a method for the secure transfer, in a transport network, of a communication established with a mobile from a current channel associated with a current base station to a next channel associated with a communication station.
- This method is implemented along a path of the mobile which is deterministically associated with successive base stations of a radiocommunication network with mobiles.
- the network is synchronized, which means that the base stations
- the momentary synchronization break typically having a duration substantially equal to 20 ms in the G.S.M, originates from the synchronization of the mobile. This last,
- the communication is temporarily interrupted.
- the power failure results for its part from the fact that the mobile at the time of cell change is at maximum admissible distances from the current and next base stations.
- the power of the data received by the mobile in this area from each of the current and next base stations therefore has a minimum power. It can therefore occur, due to radio propagation phenomena, that the mobile no longer temporarily receives the communication data.
- the prior art provides for remedying the causes of communication synchronization breakdown by providing a synchronized network in which the current and next channels involved in a transfer of a communication are identical. This identity of the current and next channels in the G.S.M results in the same time interval and the same frequency. On the other hand, it does not provide for remedying the breaks, said to be of power, of an established communication.
- a main objective of the invention is to provide a method for secure channel-to-channel transfer of a communication established with a mobile in a radiocommunication network with mobile, effectively remedying these power breaks in a communication.
- a method for the secure transfer, in a transport network, of a communication established with a mobile from a current channel associated with a current base station to a next channel associated with a following base station, along a path of said mobile which is deterministically associated with successive base stations of a radiocommunication network with mobile is characterized according to the invention in that said current and next channels are identical, and in that said method comprises the cyclic steps of:
- the given duration is a predetermined fixed duration.
- the given duration expires as soon as the difference in time is greater than a second predetermined threshold.
- two paths in opposite directions are defined for a section of the transport network in which the invention is intended to be implemented. So he is provided for the selection of a channel to which the unsecured transfer of the communication to the target base station is carried out, in one of two sets of channels according to said path.
- the successive base stations of the radiocommunication network which are deterministically associated with the path of the mobile include all the base stations included between the target base station to which the transfer from channel to channel is carried out unsecured and a last base station associated with a node or at one end of the transport network.
- FIG. 1 shows successive base station cells covering a portion of a transport network on which mobiles move
- FIG. 3 is a Cartesian diagram of a time path difference between data received by two neighboring base stations from a mobile, as a function of the position of the mobile.
- FIG. 1 represents a part of a rail transport network, typically TGV (High Speed Train).
- the network portion shown comprises a node C and three ends A, B and D, which are in practice associated with railway stations.
- Two opposite directions CD and DC connect stations C and D to each other, two opposite directions CB and BC connect stations C and B to each other and two opposite directions CA and AC connect stations to each other C and A.
- the difference between the respective dimensions of two cells is limited by a tolerance fixed by the equalization filtering technique in the mobile terminal.
- the equalization tolerance is defined by a maximum admissible time difference between two identical signals received by the terminal.
- the purpose of equalization is to absorb said temporal path difference and thus, according to the prior art, to remedy the problem resulting from propagation by multipath. It is typically 20 microseconds for GSM terminals.
- the definition of a path on which the method according to the invention can be applied is now specified. Either a given train, equipped with a mobile, leaving from the node station C bound for the end station D. There is established, from the train, a communication with the mobile in a channel carried by a station source base associated with C100 source coverage.
- the destination of the train is not known a priori from the mobile network and, as a result of the movement of the train, the first transfer of the communication from cell C100 towards the target cell C30 is operated in a conventional manner, that is to say not secure.
- such an unsecured transfer results from the transmission by the mobile of respective power levels of beacon frequency signals transmitted by the neighboring base stations.
- the infrastructure of the radiocommunication network, or mobile network typically base station controller or switch of the mobile service, receiving such measured power levels makes a decision to transfer the communication to the target base station C30 whose signal beacon frequency is received with maximum power by the mobile.
- the infrastructure of the mobile network stores the chaining, or succession, of the base stations for each of the links A from / to C, B from / to C and D from / to C.
- the chaining, or succession, of the base stations for each of the links A from / to C, B from / to C and D from / to C can be deduced in the infrastructure of the mobile network, successive cells C31 to C34 crossed by the mobile since it is known, on the one hand, according to the transfer not secure the direction of the mobile, and, on the other hand, from the memorized chaining, the successive base stations in this direction.
- the path of the mobile which can be deterministically associated with successive base stations of the radiocommunication network begins from a location of the mobile in cell C30, and this after the unsecured transfer and ends at the C34 end station.
- the path of the mobile which can be deterministically associated with successive base stations of the radiocommunication network begins from a location of the mobile in cell C33 , and this after the non-secure transfer from cell C34 to said cell C33, and ends for locating the mobile in the cell associated with station A.
- the stations of successive bases of the radiocommunication network which are deterministically associated with said path of the mobile include all the base stations included between the target base station to which a first transfer from channel to channel is made unsecured, or conventional, from a source base station through which communication is established, and a last base station associated with a node or at one end of the transport network.
- a next base station Apart from the case of the next target base station to which an insecure cell-to-cell transfer is carried out from a first source base station through which communication is established, a next base station, or several Following base stations in the case of a node station, can be determined in the infrastructure as a function of the current base station, of the direction of the mobile defined by the source and target base stations between which said transfer of cell to cell not secure, and the chaining of base stations stored in the infrastructure of the radiocommunication network. This possibility of determining the following base station or stations as a function of the current base station allows the implementation of the method according to the invention, now described with reference to FIG. 2.
- step ET1 data upwards, sent from mobile M to 1 • infrastructure 1, and downwards, sent from infrastructure 1 to mobile M, from the COM communication carried in a current channel CHl, pass through a current base station B (nl), of rank (n-1).
- step ET2 as soon as this communication COM is conveyed through the base station B (nl), the infrastructure 1 activates ACT in reception on a next channel CH2, identical to said current channel CHl, the next base station B (n) of rank n.
- the identity of the channels CHl and CH2 is expressed in a digital network by frequencies, or sequences of frequencies in technique of frequency hopping, and identical time intervals.
- the next base station B (n) is determined by the infrastructure, as described above.
- step ET3 the communication is always conveyed in the channel CHl through the base station B (nl), and, in addition, the uplink data DM of the communication which are transmitted by the mobile M are received by the next base station B (n) activated on reception. Due to the difference between the two distances separating the mobile M respectively from the current base stations B (nl) and following B (n), the uplink data of the COM communication received by the infrastructure 1 through the current base station B (nl) and these same uplink data DM of the COM communication received by the infrastructure 1 through the following base station B (n) present between them a time course difference TA.
- This time course difference TA is equal to the difference in propagation times between the mobile on the one hand, and the two base stations B (nl) and B (n) on the other hand.
- step ET4 it is determined in the infrastructure 1 whether this measured time difference TA measured is less than a predetermined threshold S. As soon as said time difference TA is less than the predetermined threshold, provision is made for the simultaneous transmission, for a given duration T, of the downlink data from the communication to the mobile M in said current channels CHl and according to CH2 respectively by said current and next base stations (step ET5), the transmission of the downlink data in the channel CHl is already effective.
- Power measurements and quality measurements of the signals received by the current base stations B (nl) and next B (n) respectively in the current channels CHl and according to CH2, can also be provided to validate the transmission step. simultaneous.
- a transmission diversity technique is implemented by the base stations B (nl) and B (n), which guarantees a better quality of reception of the communication by the mobile M.
- this diversity in transmission is effective only during the given duration T in order to avoid interference between the data transmitted in the current and next channels.
- this given duration T is such that the difference in the respective propagation times between the mobile M and the base station B (nl) on the one hand, and the mobile M and the base station B (n) d ' on the other hand, during said given duration T is not too high.
- the given duration T is a predetermined fixed duration defined in the infrastructure 1.
- this given duration T expires as soon as the difference of time step TA again becomes less than a predetermined threshold which may be identical to the predetermined threshold S triggering the simultaneous transmission.
- Figure 4 illustrates this second variant. It shows, in the form of a Cartesian diagram, the value taken by the time course difference TA as a function of the position x of the mobile M relative to the current and next base stations B (nl) and B (n).
- the simultaneous transmission is triggered as soon as the time course difference TA is greater than the threshold S, for a position xl of the mobile, and is interrupted as soon as this time course difference TA becomes again above this threshold S, for a position x2 of the mobile M.
- the infrastructure releases LIB the current channel CHl associated with the base station B (nl), and the communication COM is validated in the next channel CH2 associated with the base station B (not).
- the COM communication in the next channel CH2 must only be validated by the infrastructure 1, since this channel CH2 conveys the uplink data DM from the mobile to the infrastructure 1 (step ET3) and the downlink data sent from the infrastructure to mobile M (step ET5).
- the method according to the invention has an iterative nature, as shown by the step ET7 of incrementing a unit of the index n, the base station which follows the base station B (n), which itself has become a new current base station, namely the base station B (n + 1), is activated on reception according to a new secure transfer cycle starting at step ET2.
- step ET2 only the uplink data of the COM communication received by infrastructure 1 through the current base station B (nl) are retained, or used, for the communication established between the mobile M and a remote station, the uplink data DM of the COM communication received by the infrastructure 1 through the following base station B (n) being only used, in combination with the uplink data of the COM communication received by the infrastructure 1 through the current base station B (nl), to determine a time difference TA.
- a single next base station B (n) is activated.
- several following base stations are activated according to the invention.
- a power measurement is then carried out in each activated base station following in order to release at the expiration of a predetermined duration the next channel of one of the following base stations which does not receive the call established with sufficient power. , or the base station associated with CIO coverage in the above example.
- Each section of the transport network between node station (s) C and / or end station (s) A, B and D defines two paths in opposite directions which are carried by two tracks 11
- the method of the invention requires the availability of a next channel in the station of following base which is identical to the current channel conveying the communication with the mobile.
- a next channel in the station of following base which is identical to the current channel conveying the communication with the mobile.
- the invention remedies this by proposing that in all the base stations of a section of the transport network, a respective set of channels is allocated to each of the two directions of movement of the trains.
- the channel to which the non-secure transfer, or first transfer, is operated from a source base station for communication establishment to a target base station is selected in a respective one of two sets of channels according to the direction of the mobile.
- This direction is known to the infrastructure as a function, on the one hand, of the source base station through which the communication is established and, on the other hand, of the target base station to which the channel transfer is required .
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9412820A FR2726425B1 (fr) | 1994-10-26 | 1994-10-26 | Procede de transfert de cellule d'une communication etablie avec un mobile, dans un reseau cellulaire de radiocommunications avec des mobiles |
FR9412820 | 1994-10-26 | ||
PCT/FR1995/001407 WO1996013953A1 (fr) | 1994-10-26 | 1995-10-24 | Procede de transfert de cellule a cellule d'une communication etablie avec un mobile, dans un reseau cellulaire de radiocommunications |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0789979A1 true EP0789979A1 (fr) | 1997-08-20 |
Family
ID=9468242
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95936601A Ceased EP0789979A1 (fr) | 1994-10-26 | 1995-10-24 | Procede de transfert de cellule a cellule d'une communication etablie avec un mobile, dans un reseau cellulaire de radiocommunications |
Country Status (7)
Country | Link |
---|---|
US (1) | US5995835A (fr) |
EP (1) | EP0789979A1 (fr) |
AU (1) | AU701162B2 (fr) |
CA (1) | CA2202929A1 (fr) |
FR (1) | FR2726425B1 (fr) |
NZ (1) | NZ280225A (fr) |
WO (1) | WO1996013953A1 (fr) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19505780A1 (de) * | 1995-02-20 | 1996-08-29 | Philips Patentverwaltung | Mobilfunksystem mit verbessertem "Handover" |
US6275697B1 (en) * | 1996-06-25 | 2001-08-14 | Siemens Information And Communication Networks, Inc. | Method for coordinating the operation of mobile equipment |
GB2337180B (en) * | 1997-02-11 | 2001-05-23 | Nokia Telecommunications Oy | Radio telephone systems and methods of operation |
GB9702790D0 (en) * | 1997-02-11 | 1997-04-02 | Nokia Telecommunications Oy | Radio telephone systems and methods of operation |
US6728540B1 (en) * | 1998-03-09 | 2004-04-27 | Avaya Technology Corp. | Assisted handover in a wireless communication system |
US7548787B2 (en) | 2005-08-03 | 2009-06-16 | Kamilo Feher | Medical diagnostic and communication system |
JP3356707B2 (ja) * | 1999-01-14 | 2002-12-16 | 株式会社東芝 | 移動通信端末装置 |
JP2000217138A (ja) * | 1999-01-25 | 2000-08-04 | Nec Corp | Cdma移動通信システムにおけるパス接続制御方式 |
US7260369B2 (en) | 2005-08-03 | 2007-08-21 | Kamilo Feher | Location finder, tracker, communication and remote control system |
US9813270B2 (en) | 1999-08-09 | 2017-11-07 | Kamilo Feher | Heart rate sensor and medical diagnostics wireless devices |
KR100364368B1 (ko) * | 2000-10-18 | 2002-12-12 | 엘지전자 주식회사 | 블루투스 기술을 이용한 사설 네트워크 및 이를 이용한통신 방법 |
US7305238B2 (en) * | 2002-05-01 | 2007-12-04 | Agere Systems Inc. | Position-based capacity reservation in a mobile wireless system |
US20040058678A1 (en) * | 2002-09-23 | 2004-03-25 | Detorbal Rene Fernand Emile | Method and apparatus for facilitating handovers for a group of mobile radios |
JP4648405B2 (ja) * | 2004-12-22 | 2011-03-09 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | 分散ピコセルモビリティ |
US10009956B1 (en) | 2017-09-02 | 2018-06-26 | Kamilo Feher | OFDM, 3G and 4G cellular multimode systems and wireless mobile networks |
US7907571B2 (en) * | 2009-06-30 | 2011-03-15 | Airvana, Corp. | Mobile aware beacon |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5101501A (en) * | 1989-11-07 | 1992-03-31 | Qualcomm Incorporated | Method and system for providing a soft handoff in communications in a cdma cellular telephone system |
US5268933A (en) * | 1991-09-27 | 1993-12-07 | Motorola, Inc. | Data packet alignment in a communication system |
US5309503A (en) * | 1991-12-06 | 1994-05-03 | Motorola, Inc. | Dynamic channel assignment in a communication system |
US5327575A (en) * | 1992-03-23 | 1994-07-05 | Motorola, Inc. | Directional handover control in digital mobile radio systems employing MAHO |
US5260943A (en) * | 1992-06-16 | 1993-11-09 | Motorola, Inc. | TDM hand-off technique using time differences |
US5513380A (en) * | 1992-09-23 | 1996-04-30 | Siemens Aktiengesellschaft | Mobile speed dependent handover techniques in hierarchical mobile radio networks |
GB2273424A (en) * | 1992-12-14 | 1994-06-15 | Motorola Ltd | A cellular communications system and method for hand-off |
FR2705514B1 (fr) * | 1993-05-14 | 1995-06-23 | Alcatel Mobile Comm France | Procédé de transfert intercellulaire, ou handover, entre deux cellules d'un réseau GSM. |
US6088590A (en) * | 1993-11-01 | 2000-07-11 | Omnipoint Corporation | Method and system for mobile controlled handoff and link maintenance in spread spectrum communication |
US5663957A (en) * | 1995-07-12 | 1997-09-02 | Ericsson Inc. | Dual mode satellite/cellular terminal |
US5924033A (en) * | 1996-05-03 | 1999-07-13 | Telefonaktiebolaget L/M Ericsson (Publ) | Communication control circuitry and method for a group of commonly-moving mobile transceiver units |
-
1994
- 1994-10-26 FR FR9412820A patent/FR2726425B1/fr not_active Expired - Fee Related
-
1995
- 1995-10-11 AU AU33170/95A patent/AU701162B2/en not_active Ceased
- 1995-10-12 NZ NZ280225A patent/NZ280225A/en unknown
- 1995-10-24 CA CA002202929A patent/CA2202929A1/fr not_active Abandoned
- 1995-10-24 US US08/817,764 patent/US5995835A/en not_active Expired - Fee Related
- 1995-10-24 WO PCT/FR1995/001407 patent/WO1996013953A1/fr not_active Application Discontinuation
- 1995-10-24 EP EP95936601A patent/EP0789979A1/fr not_active Ceased
Non-Patent Citations (1)
Title |
---|
See references of WO9613953A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU701162B2 (en) | 1999-01-21 |
NZ280225A (en) | 1997-03-24 |
CA2202929A1 (fr) | 1996-05-09 |
WO1996013953A1 (fr) | 1996-05-09 |
AU3317095A (en) | 1996-05-09 |
US5995835A (en) | 1999-11-30 |
FR2726425B1 (fr) | 1996-12-20 |
FR2726425A1 (fr) | 1996-05-03 |
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