CN101296486B - synchronous switching method and system - Google Patents
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- CN101296486B CN101296486B CN2007100972681A CN200710097268A CN101296486B CN 101296486 B CN101296486 B CN 101296486B CN 2007100972681 A CN2007100972681 A CN 2007100972681A CN 200710097268 A CN200710097268 A CN 200710097268A CN 101296486 B CN101296486 B CN 101296486B
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Abstract
The invention discloses a synchronous switching method and a synchronous switching system; wherein, the synchronous switching method comprises the following steps: (S302) when a source base station determines to switch a terminal to a target base station, the target base station is requested for switching; (S304) the target base station responds to the request of the source base station and sends a switching command and the dispatching information of a random access channel to the source base station; (S306) the source base station calculates the starting time of switching according to system frame difference information and the dispatching information of the random access channel and sends the switching command and the starting time of switching to the terminal; and (S308) the terminal cuts the communication with the source base station and begins to switch to the target base station when the starting time of switching arrives. The method and the system can solve the problem that the source base station can not obtain the dispatching information of the random access channel and avoid the trouble that the source base station opens a transparent protocol unit, thus lowering the processing complexity of the system.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of method for synchronously switching and system.
Background technology
As shown in Figure 1, the distributed cellular wireless telecommunication system mainly is made up of terminal, base station and core net.Wherein, the connection of logic or physics can be arranged between the base station as required, the network that the base station is formed is called wireless access network (Radio Access Network, be called for short RAN), (for example be responsible for the Access Layer affairs, the management of Radio Resource), the Radio Resource of up-downgoing is responsible for scheduling according to the mode of shared channel by the base station.Each base station can connect with one or more core net node (Core Network is called for short CN).Core net is responsible for Non-Access Stratum affairs (for example, mobile management etc.).Terminal is meant the equipment (for example, mobile phone or notebook computer etc.) that can carry out communication with network.Each terminal can only be connected to one of them base station in the network on up direction.
Because a variety of causes need be when source base station switches to a target BS, communication that terminal needs earlier and source base station breaks according to the handover information (being commonly referred to as switching command message) that obtains from source base station, is linked into target BS then when terminal.That is to say that this is a direct-cut operation.So in handoff procedure in order to allow the step of base station and terminal keep always, source base station can add in switching command message one " time started ", terminal was left source base station and is begun to insert target BS in this time started, and this definite in advance switching mode of switching the time started is called synchronous switching.For convenience, the sub-district of terminal before switching called the cell-of-origin, the cell-of-origin is on source base station; Call Target cell switching later sub-district, Target cell is on target BS.
Source base station is when determining this time started, and need to know the parameter of two keys at least: one is the system-frame time of Target cell on the target BS; Another one is the schedule information of Radio Resource (being called for short the incision Radio Resource) on time domain that target BS offers the terminal access.
If the system-frame time that allows target BS directly transmit a Target cell to source base station is then because the process of transmitting itself need expend the regular hour, so in fact source base station can only receive a legacy system frame time.But as long as the clock of base station can reach the required precision on the engineering, time difference between the base station just can remain unchanged substantially, so usual way is a source base station at first obtains system-frame time difference between cell-of-origin and the Target cell, obtain the system-frame time of Target cell then according to system-frame time itself.Because in handoff procedure, have only terminal can obtain system-frame time difference of cell-of-origin and Target cell simultaneously, thus usually by terminal when the reporting measurement reports, report this system-frame time difference information.
The incision radio resource scheduling information be meant the incision Radio Resource on the time domain of Target cell, occur sometime or the rule that on time domain, occurs.In present long evolving system (LTE), the Random Access Channel of Target cell is used as the incision Radio Resource.For terminal, need know the schedule information of the Random Access Channel that will insert like this.This schedule information can be the gap periods (for example, 20 milliseconds) of random access time slot.The length of system-frame is 10 milliseconds, that is to say that a random access time slot will appear in per two system-frame.Can stipulate the position of all random access time slots on system-frame in advance simply.Such as, when the gap periods of random access time slot was 20 milliseconds, regulation had only odd-numbered frame that random access time slot is just arranged.In order to simplify processing, first subframe of regulation odd-numbered frame is a random access time slot in advance.Subframe is the chronomere of the littler one-level in the system-frame, for example may be prescribed as 1 millisecond.
With reference to figure 2, the flow process of the existing changing method among the LTE is described.As shown in Figure 2, existing changing method may further comprise the steps:
S202, terminal sends measurement report to source base station.Source base station judges that according to measurement report and switching control strategy needs switch, and the selected target BS that switches.The system-frame difference temporal information that may comprise cell-of-origin and Target cell in the measurement report.
S204, source base station send handoff request to target BS.Target BS is prepared the incision Radio Resource after judging that permission is switched.
S206, target BS sends Handover Request Acknowledge to source base station, comprises a transparent container in the message, comprises in this container that target BS sends to the switching command message of terminal, comprising incision radio resource parameter, for example descriptor of Random Access Channel etc.
S208, source base station send switching command to terminal, can increase by one in the switching command message and switch the time started.
S210, after receiving switching command, the communication of terminal maintenance and source base station begins to insert target BS then up to the time started.
S212, target BS send to terminal and switch access confirmation message.
S214, terminal sends handoff completion message to target BS.
In above-mentioned handoff procedure, in step S206, the descriptor of incision Radio Resource is enclosed in the transparent container, that is to say that source base station can't see the information in the container.Like this, source base station just can't obtain the schedule information of Random Access Channel.According to above-mentioned synchronous switching principle, when the gap periods of Random Access Channel during, if source base station does not know that the schedule information of Random Access Channel just can't calculate the needed time started of synchronous switching greater than 20 milliseconds.If source base station obtains corresponding information by this transparent container of decoding, can increase the processing complexity of source base station so, and run counter to the original intention that switching command message is designed to transparent vessel, just want the process of target BS design switching command message and the process of presumable design update are all shielded outside source base station.
Summary of the invention
One or more problems in view of the above the invention provides a kind of new method for synchronously switching and system.
Method for synchronously switching according to the present invention may further comprise the steps: S302, and determine and terminal need be switched under the situation of target BS at source base station, switch to target base station requests; S304, target BS send switching command and Random Access Channel schedule information in response to the request of source base station to source base station; S306, source base station calculates the switching time started according to system-frame difference information and Random Access Channel schedule information, and switching command and switching time started are sent to terminal; And S308, when terminal reached in the switching time started, the communication of disconnection and source base station, and beginning is switched to target BS.
Wherein, step S302 may further comprise the steps: S3022, source base station judge whether and terminal need be switched to target BS; And S3024, be under the situation that is in judged result, source base station sends handoff request information to target BS.
Wherein, system-frame difference information is given source base station by terminal to report.Target BS is added on the Random Access Channel schedule information in the transparent vessel information unit in addition that comprises switching command.Source base station will switch the time started in same air interface messages and switching command is issued terminal.
Wherein, system-frame difference information is cell-of-origin on the source base station and the system-frame difference information between the Target cell on the target BS.Switching the time started is the position of access slot on the Target cell system time on the target BS of Random Access Channel.Method for synchronously switching according to the present invention is used for the distributed cellular wireless telecommunication system.
Synchronous switched system according to the present invention comprises: the handoff request device, be positioned at the source base station side, and be used for switching to target base station requests determining and terminal need being switched under the situation of target BS; Information transmitting apparatus is positioned at the target BS side, is used for the request in response to the handoff request device, sends switching command and Random Access Channel schedule information to source base station; Time computing device is positioned at the source base station side, is used for calculating the switching time started according to system-frame difference information and Random Access Channel schedule information, and switching command and switching time started are sent to terminal; And the switching finishing device, be positioned at end side, be used for when the switching time started reaches, the communication between disconnected end and the source base station, and begin terminal is switched to target BS.
Wherein, the handoff request device comprises: the switching judging unit is used to judge whether and terminal need be switched to target BS; The handoff request unit, being used in judged result is under the situation that is, sends handoff request information to target BS.
Wherein, system-frame difference information is given described source base station by terminal to report.Target BS is added on the Random Access Channel schedule information in the transparent vessel information unit in addition that comprises switching command.Source base station will switch the time started in same air interface messages and switching command is issued terminal.
Wherein, system-frame difference information is cell-of-origin on the source base station and the system-frame difference information between the Target cell on the target BS.Switching the time started is the position of access slot on the Target cell system time on the target BS of Random Access Channel.Synchronous switched system according to the present invention is used for the distributed cellular wireless telecommunication system.
In order to allow source base station calculate the time started of switching synchronously, target BS needs the schedule information of clear and definite notification source base station Random Access Channel.This information is added in the handover request ack message, but in the outside of transparent vessel, that is to say that newly-increased information is visible information between target BS and the source base station.The present invention is by increasing the schedule information content of Random Access Channel in switching request acknowledgement message, overcome the problem that source base station can't obtain the Random Access Channel schedule information, avoid source base station to open the trouble of transparent protocol unit, thereby reduced the processing complexity of system.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of distributed cellular wireless telecommunication system of the prior art;
Fig. 2 is the schematic flow sheet of method for synchronously switching of the prior art;
Fig. 3 is the flow chart according to the method for synchronously switching of the embodiment of the invention;
Fig. 4 is the schematic flow sheet of method for synchronously switching according to another embodiment of the present invention;
Fig. 5 is the schematic diagram of the switching time started computational process among Fig. 3, the embodiment shown in Figure 4; And
Fig. 6 is the block diagram according to the synchronous switched system of the embodiment of the invention.
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
With reference to figure 3, the method for synchronously switching according to the embodiment of the invention is described.As shown in Figure 3, this method for synchronously switching may further comprise the steps: S302, and determine and terminal need be switched under the situation of target BS at source base station, switch to target base station requests; S304, target BS send switching command and Random Access Channel schedule information in response to the request of source base station to source base station; S306, source base station calculates the switching time started according to system-frame difference information and Random Access Channel schedule information, and switching command and switching time started are sent to terminal; And S308, when terminal reached in the switching time started, the communication of disconnection and source base station, and beginning is switched to target BS.
Wherein, step S302 may further comprise the steps: S3022, source base station judge whether and terminal need be switched to target BS; And S3024, be under the situation that is in judged result, source base station sends handoff request information to target BS.
Wherein, system-frame difference information is given source base station by terminal to report.Target BS is added on the Random Access Channel schedule information in the transparent vessel information unit in addition that comprises switching command.Source base station will switch the time started in same air interface messages and switching command is issued terminal.
Wherein, system-frame difference information is cell-of-origin on the source base station and the system-frame difference information between the Target cell on the target BS.Switching the time started is the position of access slot on the Target cell system time on the target BS of Random Access Channel.Method for synchronously switching according to the present invention is used for the distributed cellular wireless telecommunication system.
With reference to figure 4, method for synchronously switching according to another embodiment of the present invention is described.As shown in Figure 4, this method for synchronously switching may further comprise the steps:
S402, terminal sends measurement report to source base station.Source base station judges that according to measurement report and switching control strategy needs switch, and the selected target BS that switches.Comprised the system-frame difference information between cell-of-origin and the Target cell in the measurement report.
S404, source base station send handoff request to target BS.Target BS is prepared the incision Radio Resource after judging that permission is switched.
S406, target BS sends Handover Request Acknowledge to source base station, comprises a transparent container in the message, comprises in this container that target BS sends to the switching command message of terminal, comprising the incision radio resource parameter, such as the descriptor of Random Access Channel etc.Outside transparent vessel, also comprised the schedule information of Random Access Channel, such as the gap periods of random access time slot.
S408, the schedule information of the Random Access Channel that source base station obtains according to the system-frame difference information of terminal to report and from target BS calculates the time started of synchronous switching, and this time started is included in source base station sends in the switching command of terminal.
S410, after receiving switching command, the communication of terminal maintenance and source base station begins to insert target BS then up to the time started.
S412, target BS send to terminal and switch access confirmation message.
S414, terminal sends handoff completion message to target BS.
With reference to figure 5, the switching time started computational process among key diagram 3, the embodiment shown in Figure 4.As shown in Figure 5, suppose: the cycle of system-frame is 2048 frames.The access slot cycle of the Random Access Channel of system can be above 40 milliseconds.The access slot gap periods of the Random Access Channel that Target cell is used for switching is 20 milliseconds.Random access time slot is distributed in odd-numbered frame.System-frame difference framing difference and subframe differ from two parts between cell-of-origin and the Target cell.The frame number that the frame difference is defined as the cell-of-origin present frame and the absolute difference of the frame number of the frame of corresponding Target cell and 4 mould.The subframe difference is defined as the number of sub frames that the cell-of-origin present frame falls behind the frame of corresponding Target cell in time, and scope is 0～9.
System-frame differs and is 2 frames+1 subframe between cell-of-origin that terminal measures and the Target cell.Measurement report is received at 103 frames in the cell-of-origin.Source base station sends switching command message at 106 frames.Source base station can calculate with the frame number of the Target cell of 103 frame correspondences being that the position in cycle frame cycle is 1 with 4, so be odd-numbered frame, be meant No. 37 frames of Target cell in the drawings.Frame with 106 frame correspondences is an even frame so, is 0 in the position that is cycle period with 4 frames, is meant No. 40 frames of Target cell in the drawings.Source base station is by transmitting time, the processing time of terminal and the factors such as lock in time that terminal turns to Target cell of estimation switching command message, and the time started that decision is switched is position 1.Because receiving the position of the frame of switching command is 0, the implication of time started is meant that terminal should receive that the later next random access time slot of switching command inserts Target cell, just Target cell No. 41 frames in the drawings.
With reference to figure 6, the synchronous switched system according to the embodiment of the invention is described.As shown in Figure 6, this synchronous switched system comprises: handoff request device 602, be positioned at the source base station side, and be used for switching to target base station requests determining and terminal need being switched under the situation of target BS; Information transmitting apparatus 604 is positioned at the target BS side, is used for the request in response to the handoff request device, sends switching command and Random Access Channel schedule information to source base station; Time computing device 606 is positioned at the source base station side, is used for calculating the switching time started according to system-frame difference information and Random Access Channel schedule information, and switching command and switching time started are sent to terminal; And switch finishing device 608, and be positioned at end side, be used for when the switching time started reaches, the communication between disconnected end and the source base station, and begin terminal is switched to target BS.
Wherein, handoff request device 602 comprises: switching judging unit 6022 is used to judge whether and terminal need be switched to target BS; Handoff request unit 6024, being used in judged result is under the situation that is, sends handoff request information to target BS.
Wherein, system-frame difference information is given described source base station by terminal to report.Target BS is added on the Random Access Channel schedule information in the transparent vessel information unit in addition that comprises switching command.Source base station will switch the time started in same air interface messages and switching command is issued terminal.
Wherein, system-frame difference information is cell-of-origin on the source base station and the system-frame difference information between the Target cell on the target BS.Switching the time started is the position of access slot on the Target cell system time on the target BS of Random Access Channel.Synchronous switched system according to the present invention is used for the distributed cellular wireless telecommunication system.
In sum, source base station need know that the schedule information of the Random Access Channel of system-frame difference information between cell-of-origin and the Target cell and incision can calculate the time started of synchronous switching.In order to allow source base station calculate the time started of switching synchronously, target BS needs the schedule information of clear and definite notification source base station Random Access Channel.This information is added in the handover request ack message, but in the outside of transparent vessel, that is to say that newly-increased information is visible information between target BS and the source base station.
The present invention is by increasing the schedule information content of Random Access Channel in switching request acknowledgement message, overcome the problem that source base station can't obtain the Random Access Channel schedule information, avoid source base station to open the trouble of transparent protocol unit, thereby reduced the processing complexity of system.
The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (14)
1. a method for synchronously switching is characterized in that, may further comprise the steps:
S302 determines and terminal need be switched under the situation of target BS at source base station, switches to described target base station requests;
S304, described target BS is in response to the request of described source base station, send switching command and Random Access Channel schedule information to described source base station, wherein, described target BS is added on described Random Access Channel schedule information in the transparent vessel information unit in addition that comprises described switching command;
S306, described source base station calculates the switching time started according to system-frame difference information and described Random Access Channel schedule information, and described switching command and described switching time started are sent to described terminal; And
S308, when described terminal reached in the described switching time started, the communication of disconnection and described source base station, and beginning is switched to described target BS.
2. method for synchronously switching according to claim 1 is characterized in that, described step S302 may further comprise the steps:
S3022, described source base station judge whether and described terminal need be switched to described target BS; And
S3024 is under the situation that is in judged result, and described source base station sends handoff request information to described target BS.
3. method for synchronously switching according to claim 2 is characterized in that, described system-frame difference information is given described source base station by described terminal to report.
4. method for synchronously switching according to claim 3 is characterized in that, described source base station is issued described terminal with described switching time started and described switching command in same air interface messages.
5. method for synchronously switching according to claim 4 is characterized in that, described system-frame difference information is cell-of-origin on the described source base station and the system-frame difference information between the Target cell on the described target BS.
6. method for synchronously switching according to claim 5 is characterized in that, the described switching time started is the position of access slot on the Target cell system time on the described target BS of described Random Access Channel.
7. method for synchronously switching according to claim 6 is characterized in that described method is used for the distributed cellular wireless telecommunication system.
8. a synchronous switched system is characterized in that, comprising:
The handoff request device is positioned at the source base station side, is used for switching to described target base station requests determining and terminal need being switched under the situation of target BS;
Information transmitting apparatus, be positioned at described target BS side, be used for request in response to described handoff request device, send switching command and Random Access Channel schedule information to described source base station, wherein, described target BS is added on described Random Access Channel schedule information in the transparent vessel information unit in addition that comprises described switching command;
Time computing device is positioned at described source base station side, is used for calculating the switching time started according to system-frame difference information and described Random Access Channel schedule information, and described switching command and described switching time started are sent to described terminal; And
Switch finishing device, be positioned at described end side, be used for when the described switching time started reaches, disconnect the communication between described terminal and the described source base station, and begin described terminal is switched to described target BS.
9. synchronous switched system according to claim 8 is characterized in that, described handoff request device comprises:
The switching judging unit is used to judge whether and described terminal need be switched to described target BS;
The handoff request unit, being used in judged result is under the situation that is, sends handoff request information to described target BS.
10. synchronous switched system according to claim 9 is characterized in that, described system-frame difference information is given described source base station by described terminal to report.
11. synchronous switched system according to claim 10 is characterized in that, described source base station is issued described terminal with described switching time started and described switching command in same air interface messages.
12. synchronous switched system according to claim 11 is characterized in that, described system-frame difference information is cell-of-origin on the described source base station and the system-frame difference information between the Target cell on the described target BS.
13. synchronous switched system according to claim 12 is characterized in that, the described switching time started is the position of access slot on the Target cell system time on the described target BS of described Random Access Channel.
14. synchronous switched system according to claim 13 is characterized in that described system is used for the distributed cellular wireless telecommunication system.
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| CN2007100972681A CN101296486B (en) | 2007-04-28 | 2007-04-28 | synchronous switching method and system |
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| CN104202779B (en) * | 2014-09-05 | 2018-01-02 | 中国电子科技集团公司第七研究所 | Cell switching method and system in communication system |
| EP3337237B1 (en) * | 2015-12-31 | 2021-06-16 | Huawei Technologies Co., Ltd. | Switching method and device in ultra-dense network |
| CN108605258B (en) * | 2016-11-30 | 2021-02-12 | 华为技术有限公司 | Mobility management method, base station and wearable device |
| CN108347749B (en) * | 2017-01-24 | 2021-01-15 | 中国移动通信有限公司研究院 | Switching method, user equipment and base station |
| CN108882259B (en) * | 2017-05-16 | 2020-10-27 | 维沃移动通信有限公司 | Random access method, terminal, source base station and target base station |
| CN113099495B (en) * | 2020-01-09 | 2022-04-15 | 大唐移动通信设备有限公司 | Gateway station conversion method, device, terminal and gateway station |
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| CN1363154A (en) * | 2000-02-01 | 2002-08-07 | 三星电子株式会社 | Scheduling apparatus and method for packet data service in wireless communication system |
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| CN1363154A (en) * | 2000-02-01 | 2002-08-07 | 三星电子株式会社 | Scheduling apparatus and method for packet data service in wireless communication system |
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