CN1206543A - Handover method and cellular radio network - Google Patents
Handover method and cellular radio network Download PDFInfo
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- CN1206543A CN1206543A CN 97191536 CN97191536A CN1206543A CN 1206543 A CN1206543 A CN 1206543A CN 97191536 CN97191536 CN 97191536 CN 97191536 A CN97191536 A CN 97191536A CN 1206543 A CN1206543 A CN 1206543A
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- base station
- travelling carriage
- neighbor cell
- serving cell
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Abstract
The invention relates to a handover method and a cellular radio network. In a handover when a mobile station (120) moves from a serving cell (110) to a neighbouring cell (112), a two-way radio connection (130) between a base station (102) of a serving cell (110) and the mobile station (120) is changed into a two-way radio connection (132) between the base station (104) of the neighbouring cell (112) and the mobile station (120). In accordance with the invention, the base station (104) of the neighbouring cell (112) emulates the base station (102) of the serving cell (110) in the handover by sending a handover command to the mobile station as if it was sent by the base station (102) of the serving cell (110). A method is also presented for calculating the correct transmission time.
Description
Invention field
The present invention relates in cellular radio, guarantee the method for the handover of travelling carriage, this cellular radio comprises at least one base station system and at least one travelling carriage, base station system comprises at least two base stations and at least one base station controller, and there are the area of coverage, i.e. a sub-district in the base station.In handover, when travelling carriage when a Serving cell moves to neighbor cell, the base station of Serving cell and the double-direction radio between the travelling carriage connect the base station and the double-direction radio between the travelling carriage that become neighbor cell and connect.
Technical background
In handover, under the situation that the user does not discover, base station and the double-direction radio between the travelling carriage that the wireless connections that exist between the base station of Serving cell and the travelling carriage become adjacent cell on certain other channel (being neighbor cell) connect, and just will keep minimum by what handover caused to the possible at least interference of wireless connections.Yet, always can under situation about not noted, not realize handover, because under the environment of operation that travelling carriage moves relative to the base station, because genuine, bridge or building, the radio wave propagation is prevented from, wireless connections will be lost.Yet because travelling carriage is got back to the area of coverage of certain base station in addition, it is possible continuing to connect in very short time.
Therefore, in theory, be possible on continuing to connect after handover is temporarily lost and connected.A this major reason of losing is exactly the border that travelling carriage is crossed the minizone very fast, does not have time enough correctly to realize handover.
Wireless connections of having lost are attempted the function that the reconstruction by prior art connects and are recovered.Under the sort of situation, travelling carriage is selected the strongest channel of signal from its known channel, and sends a connection reconstruction request to the base station of this sub-district.If it is destroyed on network level connecting, then problem is just serious, in this case, connects and has lost inevitably.This is because when connection was lost, in mobile switching centre, a timer will be started.If mobile switching centre did not receive the relevant information requested of rebuilding before timer stops, this will destroy all information relevant with the connection of losing.Even free the reconstruction connects before timer stops, seem to be interrupted and interrupt continuing oversize owing to connect, the opposing party that may occur calling out turn-offs the situation of connection.Gsm mobile communication system (Michel Mouly and Marie-Bernadette Pautet, 1992, ISDN:2-9507190-0-0-7) the 412nd page to the 415th page call re-establishment function and relevant with it various uncertainties have been discussed.In this, people wish can solve in better mode in system in future.
Inventive features
The objective of the invention is to eliminate the problem relevant with known arrangement.
This can be used in method as described in the preamble and obtain, and it is characterized in that, the base station of Serving cell has been imitated in the base station of neighbor cell in handover.
The present invention relates to a cellular radio that comprises at least one base station system and at least one travelling carriage simultaneously, and base station system comprises at least two base stations and at least one base station controller, and there are the area of coverage, i.e. a sub-district in the base station.In handover, when travelling carriage when a Serving cell moves to neighbor cell, the base station of Serving cell and the double-direction radio between the travelling carriage connect the base station and the double-direction radio between the travelling carriage that become neighbor cell and connect.
Native system is characterised in that, arranges the base station of the base station imitation Serving cell of neighbor cell in handover.
Can obtain some advantages with the method described in the present invention.The most tangible advantage is that the present invention guarantees a handover, under the sort of situation, needn't use the reconstruction function of uncertain connection.Like this, temporary transient interrupted connection can more properly be preserved.Network user is regarded this raising of service quality as, because under this situation that originally may lose connection, that has avoided connecting loses.
System of the present invention has the advantage identical with said method.Preferred embodiment and other more detailed embodiment have emphasized advantage of the present invention.Obviously, preferred embodiment can be merged into the technique effect that different combinations obtains to expect mutually with other more detailed embodiment.
The accompanying drawing summary
Below, will be with reference to more detailed ground explain the present invention of example of subsequently accompanying drawing.Wherein,
Fig. 1 has shown the requisite part of the present invention in the cellular radio of the present invention,
Fig. 2 shows schematically illustrating of Time Calculation in the invention.In time, the base station of neighbor cell sends the base station that signal imitates Serving cell to travelling carriage.
The description of preferred embodiment
Study Fig. 1 earlier.Method and system of the present invention can be used in any cellular radio, to guarantee the handover of travelling carriage 120.Below, describe the present invention with reference to gsm system, but the present invention is not limited to this.Cellular radio typically is made up of base station system.Base station system comprises at least two base stations 102,104 and at least one base station controller 100.Base station 102,104 comprises an area of coverage, and promptly the sub-district 110,112.Travelling carriage 120 moves in sub-district 110,112.Travelling carriage 120 also can move the border 114 of crossing between sub-district 110 and 112.Between the base station 102 of Serving cell 110 and travelling carriage 120, there is a double-direction radio to connect 130.A handover is meant, when travelling carriage 120 when Serving cell 110 moves to neighbor cell 112, the base station 102 of Serving cell 110 and the double-direction radio between the travelling carriage 120 connect 130 base station 104 and the double-direction radios between the travelling carriage 120 that become neighbor cell 112 and connect 132.
Abide by the present invention, in handover, the base station 102 of Serving cell 110 has been imitated in the base station 104 of neighbor cell 112.In imitation, a handoff command is sent to travelling carriage 120 in the base station 104 of neighbor cell 112, seems that this order is to be sent by the base station 102 of Serving cell 110.
In first-selected embodiment of the present invention, this method realizes in the following manner.At first, set up one with normal mode and connect 130, be i.e. the base station 102 of base station controller 100 starting Serving cells 110 and the connection 130 between the travelling carriage 120.Then, base station controller 100 is by providing the standard parameter of employed wireless connections 130, and at least one base station 104 of the neighbor cell 112 of starting Serving cell 110 enters stand-by state.Travelling carriage 120 moves to certain neighbor cell 112, and whether base station 104 monitoring that is made as the neighbor cell 112 of stand-by state detects travelling carriage 120 in its sub-district 112.When travelling carriage 120 moved the border 114 of crossing between Serving cell 110 and the neighbor cell 112, the base station 104 of neighbor cell 112 was given base station controller 100 this event notice.Rely on this situation, base station controller 100 is known: the base station 102 of Serving cell 110 and the connection 130 between the travelling carriage 120 have been interrupted, or passed through a normal handover of base station 102 impossible realizations of Serving cell 110, or the handover of a success will more may be realized by the base station 104 of neighbor cell 112.In this case, base station controller 100 recovers relevant and connects all information of 130 and this information is sent to the base station 104 of neighbor cell 112 from the base station 102 of Serving cell 110, and all relevant business of 102 places, base station that finish Serving cell 110 and connection 130.Afterwards, a correct timing advance is calculated in the base station 104 of neighbor cell 112.Base station controller 100 by use base station 102 from original Serving cell 110 that obtain with connect 130 relevant information, the base station 104 of order neighbor cell 112 continues to connect 132, seems that it is the base station 102 of original Serving cell 110.104 1 handoff command in base station that base station controller 100 is given neighbor cell 112, afterwards, a normal handover step is realized in the base station 104 of neighbor cell 112, and its sub-district becomes the Serving cell 112 of connection 132.At last, base station controller 100 is cancelled to be connected to from the base station 102 of original Serving cell 110 and is connected 130 resource.
In order to reduce the load of base station 104, can be optimized this function and make base station controller 100 that such base station 104 only is set to enter stand-by state, in such base station 104, travelling carriage 120 may fast moving passes the border 114 between sub-district 110 and 112.
Because the validity of the inventive method, the boundary 140 of handover area, the zone of just realizing handover, littler than common.
The another kind of method that reduces the load of base station 104 by optimization is in the very little cellular radio of cell size, do not calculate the value of regularly mentioning and correct the propagation delay that causes by distance between base station 104 and the travelling carriage 120, because propagation delay in this case is also very little.
If can not use the optimization method of proposition, calculating can realize by the described following mode of Fig. 2.The base station 102 of Serving cell 110 is sent a signal in time T to travelling carriage 120.Travelling carriage 120 receives the signal of being sent by the base station 102 of Serving cell 110 in time T 1.Travelling carriage 120 has wherein been considered timing advance TA in the base station 102 that time T 2 is given Serving cell 110 this signal.The base station 104 of neighbor cell 112 knows that from the base station 104 of neighbor cell 112 to the distance D 1 of the base station 102 of Serving cell 110, D1 is expressed as signal propagation delays.The base station 104 of neighbor cell 112 has received the base station 102 of Serving cell 110 in time T in time T ' send to the signal of travelling carriage 120.The base station 102 of the 104 calculation services sub-districts 110, base station of neighbor cell 112 sends the time of signal, and promptly time T deducts D1 and obtains from T '.The time T 2 of travelling carriage 120 to the base station of Serving cell 110 102 transmission signals calculated in the base station 104 of neighbor cell 112, deducts half of TA from time T, and promptly TA/2 obtains.The base station 104 of neighbor cell 112 receives the signal that travelling carriage 120 sends to the base station 102 of Serving cell 110 at moment T2 '.The base station 104 of neighbor cell 112 calculates the distance D 2 of travelling carriage 120, and D2 is expressed as signal propagation delays, deducts T2 and try to achieve from time T 2 '.At last, the base station 104 operation parameter T1 and the D2 of neighbor cell 112 deduct D2 from T1, calculate the time T 3 of the base station 104 of neighbor cell 112 to travelling carriage 120 transmission signals, seem that it is the base station 102 of Serving cell 110.
This method is used for cellular radio, and wherein required variation is in handover to the method for prior art, and the base station 104 of neighbor cell 112 is used to imitate the base station 102 of Serving cell 110.Under the sort of situation, the new function of system is: the base station 104 of neighbor cell 112 is arranged at least one travelling carriage 120 of Monitoring Service sub-district 110.And the base station 104 of neighbor cell 112 and/or base station controller 100 prepare to receive the information of the relevant wireless connections 130 of being sent by the base station 102 of Serving cell 110, and calculate the time of the base station 104 of neighbor cell to travelling carriage 120 transmission signals.Monitoring is realized by base station 104 existing measuring receivers, for example passes through a normal receiver or a tester's receiver.With the parameter of prior art handle the same, realization in the base station that is received in neighbor cell 112 104 of the information relevant and/or the base station controller 100 with wireless connections 130.The information relevant with wireless connections 130 comprises: the description of wireless channel, a training sequence, a timing advance and an encrypting key.The calculating in transmission time realizes in the base station 104 of neighbor cell 112 and/or base station controller 100 in the above described manner.The most simply, the present invention can be used as a software and realizes.Software can deposit in the memory of base station 104 and/or base station controller 100, and processed in the processor that comprises in equipment.Should be with also realizing by general processor or signal processor or an independent logic.
Although example has above with reference to the accompanying drawings been done explanation to the present invention, clearly, the present invention not only is confined to this, in the scope of disclosed inventive concept set forth, can change in every way in claim subsequently.
Claims (11)
1, a kind of method that in cellular radio, guarantees the handover of travelling carriage, this cellular radio comprises at least one base station system and at least one travelling carriage (120), base station system comprises at least two base stations (102,104) and at least one base station controller (100), and base station (102,104) area of coverage is arranged, it is sub-district (110,112), in handover, when travelling carriage (120) when a Serving cell (110) moves to neighbor cell (112), base station (102) and the double-direction radio between the travelling carriage (120) in Serving cell (110) connect base station (104) and the connection of the double-direction radio between the travelling carriage (120) (132) that (130) become neighbor cell (112), it is characterized in that: in handover, the base station (102) of Serving cell (110) has been imitated in the base station (104) of neighbor cell (112).
2, according to the method for claim 1, it is characterized in that: in imitation, the base station (104) of neighbor cell (112) sends a handoff command to travelling carriage (120), seems that it is to be sent by the base station (102) of Serving cell (110).
3, according to the method for claim 1, it is characterized in that:
The base station (102) of base station controller (100) starting Serving cell (110) and the connection between the travelling carriage (120);
Base station controller (100) makes it to enter stand-by state by at least one base station (104) that the standard parameter that employed wireless connections (130) are provided starts neighbor cell (112);
Travelling carriage (120) is shifted to certain neighbor cell (112), and whether base station (104) monitoring in its sub-district (112) that is set to the neighbor cell (112) of stand-by state detects travelling carriage (120);
When travelling carriage (120) passed border (114) between Serving cell (110) and the neighbor cell (112), the base station (104) of neighbor cell (112) was just given base station controller (100) this event notice;
Base station controller (100) is known: the base station (102) of Serving cell (110) and the connection (130) between the travelling carriage (120) have been interrupted, or by a normal handover of the impossible realization in the base station (102) of Serving cell (110), or the handover of a success will more may be realized by the base station (104) of neighbor cell (112);
Base station controller (100) recovers relevant all information that connect (130) from the base station (102) of Serving cell (110), and this information sent to the base station (104) of neighbor cell (112), and all business relevant with connecting (130) are located in the base station (102) of finishing Serving cell (110);
A correct timing advance is calculated in the base station (104) of neighbor cell (112);
Base station controller (100) by use obtain from the base station (102) of original Serving cell (110) with connect (130) relevant information, the base station (104) of order neighbor cell (112) continue to connect (132), seems that it is the base station (102) of original Serving cell (110);
Base station controller (100) is given (104) handoff command in base station of neighbor cell (112), afterwards, a normal handover step is realized in the base station (104) of neighbor cell (112), and its sub-district becomes the Serving cell (112) of connection (132);
At last, base station controller (100) is cancelled the resource that is connected to connection (130) from the base station (102) of original Serving cell (110).
4, according to the method for claim 3, it is characterized in that: Serving cell (110) that travelling carriage (120) passes and the border (114) between the neighbor cell (112) are detected on the wireless field density based measurement to travelling carriage (120) by the base station (104) of neighbor cell (112).
5, according to the method for claim 3, it is characterized in that: base station controller (100) only is provided with such base station (104) and enters stand-by state, in such base station (104), travelling carriage (120) possibility fast moving is passed the border (114) between the sub-district (110,112).
6, according to the method for claim 3, it is characterized in that: the boundary of handover area (140) is littler than common.
7, according to the method for claim 3, it is characterized in that: in the very little cellular radio of cell size, do not calculate the value of timing advance and correct the propagation delay that causes by distance between base station (102,104) and the travelling carriage (120), because propagation delay in this case is very little.
8, according to the method for claim 3, it is characterized in that:
The base station (102) of Serving cell (110) is sent a signal in time T to travelling carriage (120);
Travelling carriage (120) receives the signal of being sent by the base station (102) of Serving cell (110) in time T 1;
Travelling carriage (120) send a signal to give the base station (102) of Serving cell (110) in time T 2, has wherein considered timing advance TA;
The base station (104) of neighbor cell (112) knows that from the base station (104) of neighbor cell (112) to the distance D 1 of the base station (102) of Serving cell (110), D1 is represented as signal propagation delays;
The base station (104) of neighbor cell (112) in base station (102) that time T has received Serving cell (110) in time T ' send to the signal of travelling carriage (120);
The base station (104) of neighbor cell (112) deducts D1 by operation parameter T ' and D1 from T ', the base station (102) of calculation services sub-district (110) sends the time of signal, i.e. time T;
The base station (104) of neighbor cell (112) thus operation parameter T and TA deduct half of TA from time T, i.e. TA/2 calculates the time T 2 that travelling carriage (120) sends a signal to the base station (102) of Serving cell (110);
The base station (104) of neighbor cell (112) receives the signal that travelling carriage (120) sends to the base station (102) of Serving cell (110) in time T 2 ';
The base station (104) of neighbor cell (112) promptly deducts T2 by operation parameter T2 and T2 ' from T2 ', calculate the distance D 2 of travelling carriage (120), and D2 is represented as signal propagation delays;
Base station (104) the operation parameter T1 and the D2 of neighbor cell (112) promptly deduct D2 from T1, calculate the time T 3 of the base station (104) of neighbor cell (112) to travelling carriage (120) transmission signal, seem that it is the base station (102) of Serving cell (110).
9, a cellular radio, comprise at least one base station system and at least one travelling carriage (120), base station system comprises at least two base stations (102,104) and at least one base station controller (100), and base station (102,104) area of coverage is arranged, it is sub-district (110,112), in handover, when travelling carriage (120) when a Serving cell (110) moves to neighbor cell (112), base station (102) and the double-direction radio between the travelling carriage (120) in Serving cell (110) connect base station (104) and the connection of the double-direction radio between the travelling carriage (120) (132) that (130) become neighbor cell (112), it is characterized in that: in handover, the base station (104) of neighbor cell (112) is arranged to imitate the base station (102) of Serving cell (110).
10, according to the system of claim 9, it is characterized in that: the base station (104) of neighbor cell (112) is arranged monitoring at least one travelling carriage (120) at Serving cell (110).
11, according to the system of claim 9, it is characterized in that: the base station (104) and/or the base station controller (100) of neighbor cell (112) are arranged
The information of the relevant wireless connections (130) that reception is sent by the base station (102) of Serving cell (110), and
The base station (104) of calculating neighbor cell (112) sends the time of signal to travelling carriage (120).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97191536 CN1206543A (en) | 1996-10-30 | 1997-10-23 | Handover method and cellular radio network |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI964382 | 1996-10-30 | ||
| CN 97191536 CN1206543A (en) | 1996-10-30 | 1997-10-23 | Handover method and cellular radio network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1206543A true CN1206543A (en) | 1999-01-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97191536 Pending CN1206543A (en) | 1996-10-30 | 1997-10-23 | Handover method and cellular radio network |
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| Country | Link |
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| CN (1) | CN1206543A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101036410B (en) * | 2004-08-02 | 2010-12-29 | Lg电子株式会社 | Method of performing handover in a broadband wireless access system |
| CN101379855B (en) * | 2007-04-28 | 2012-06-27 | 华为技术有限公司 | Method and system for switching from a source district to a target district in honeycomb communication system |
| CN101395952B (en) * | 2006-04-14 | 2014-05-07 | 高通股份有限公司 | Pseudo wires for mobility management |
-
1997
- 1997-10-23 CN CN 97191536 patent/CN1206543A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101036410B (en) * | 2004-08-02 | 2010-12-29 | Lg电子株式会社 | Method of performing handover in a broadband wireless access system |
| CN101395952B (en) * | 2006-04-14 | 2014-05-07 | 高通股份有限公司 | Pseudo wires for mobility management |
| CN101379855B (en) * | 2007-04-28 | 2012-06-27 | 华为技术有限公司 | Method and system for switching from a source district to a target district in honeycomb communication system |
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