CN104185207A

CN104185207A - Cell switchover method and device, service base station and terminal

Info

Publication number: CN104185207A
Application number: CN201410468856.1A
Authority: CN
Inventors: 李明菊; 朱亚军
Original assignee: Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
Current assignee: Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
Priority date: 2014-09-15
Filing date: 2014-09-15
Publication date: 2014-12-03
Anticipated expiration: 2034-09-15
Also published as: CN104185207B

Abstract

The invention provides a cell switchover method and device, a service base station and a terminal. The cell switchover method comprises the steps that the service base station obtains switch state information and switch time information, of a plurality of adjacent mini cells, in a measurement report after receiving the switchover triggered measurement report sent by the terminal; the service base station selects a target mini cell to which the terminal is to be switched from the adjacent mini cells according to the switch state information and the switch time information of the adjacent mini cells. According to the technical scheme, the terminal which has the cell switchover requirement can be switched into the target cell as soon as possible, and communication is recovered as soon as possible, so that switchover interruption time is shortened, and user experience is improved.

Description

Cell switching method, community switching device shifter, serving BS and terminal

Technical field

The present invention relates to community and select technical field, in particular to a kind of cell switching method, a kind of community switching device shifter, a kind of serving BS and a kind of terminal.

Background technology

In wireless network, for the continuity that ensures that mobile subscriber communicates by letter, very important effect has been played in user's mobile management.For the user of connection status who only has a Serving cell, the variation of any Serving cell, is all the process of once switching.The process of switching mainly comprises measurement, and switch decision and switching are carried out.And switch decision wherein refers to the measurement report according to user terminal, selects a suitable Target cell.

And in traditional mobile network, is all opening community, the community of not closing.So user is in moving process, when the signal strength signal intensity of Serving cell reduces, when the signal strength signal intensity of adjacent cell uprises, user terminal can strength of transmitted signals measurement report.And the signal strength measurement report that serving BS can send according to user terminal is come select target community, namely signal strength signal intensity Gao community.That is to say, the switching target small area selection criterion in existing network is mainly based on signal strength measurement.

In present small-cell network, semi-static or dynamic switch can be carried out according to situations such as interference or cell loads in small-cell.That is to say that certain small-cell opening at the moment, but may just close soon.Otherwise also is likely closing at the moment certain small-cell, and opened soon.Existing handover scheme is not considered the state of small-cell switch, and is mainly to decide Target cell according to signal strength signal intensity, may cause like this prolongation of user's HO-break duration.Such as, serving BS has been selected Target cell according to signal strength signal intensity, when access in, is prepared to switch in closed condition at user terminal in Dan Gai community, this user can not access this Target cell at once so, can not recover as soon as possible communication, can only wait until when this Target cell becomes opening from closed condition and could access this Target cell recovery communication.Like this, user's communication interruption time extends, and user experiences variation.

Therefore need a kind of new technical scheme, can make to need the terminal of switching cell can cut as soon as possible Target cell, recover as early as possible communication, thereby reduce HO-break duration, promote user's experience.

Summary of the invention

The present invention, just based on the problems referred to above, has proposed a kind of new technical scheme, can make to need the terminal of switching cell can cut as soon as possible Target cell, recovers as early as possible communication, thereby reduces HO-break duration, promotes user's experience.

In view of this, the present invention proposes a kind of cell switching method, comprise: serving BS is receiving after the measurement report of handover trigger that terminal sends, obtain in described measurement report the on off state information of each adjacent small-cell and switching time information in multiple adjacent small-cells; Described serving BS according to the on off state information of described each adjacent small-cell and switching time information, from described multiple adjacent small-cells, select described terminal be about to incision target small-cell.

Tradition changing method, because do not consider the on off state of community, so may choose a community of closing as Target cell, could access Target cell when user must wait Target cell to open like this, recovers communication, so make HO-break duration elongated.And in technical scheme of the present invention, serving BS, in the time of the Target cell of selecting to switch to terminal, is considered on off state and the switching time of adjacent small-cell, thereby is made this switching terminal can be cut into as soon as possible target small-cell, recover as early as possible communication, reduce HO-break duration.

In technique scheme, preferably, also comprise: described serving BS obtains in described measurement report the signal strength information of each adjacent small-cell in multiple adjacent small-cells; Described serving BS is according to the on off state information of described each adjacent small-cell, described switching time information and described signal strength information, selects described terminal and be about to the target small-cell of incision from described multiple adjacent small-cells.

In this technical scheme, can also consider on off state information, switching time information and signal strength information, select most suitable Target cell according to the on off state of adjacent small-cell, switching time and signal strength signal intensity.Such as, multiple adjacent small-cells are approximate aspect on off state and switching time, if two adjacent small-cells are all in opening, and residue opening time difference is little, now, can select adjacent small-cell that signal strength signal intensity is stronger as Target cell.

In technique scheme, preferably, described serving BS obtains in described measurement report the on off state information of each adjacent small-cell and switching time information in multiple adjacent small-cells, specifically comprise: terminal read each adjacent small-cell described on off state information and described switching time information, and by described on off state information and described switching time information be sent to described serving BS so that described serving BS get described on off state information and described switching time information; Or described serving BS sends handover request to the base station of described each adjacent small-cell, and the base station that receives described each adjacent small-cell by handover request answers described on off state information that signaling feeds back and described switching time information; Or described serving BS sends information acquisition request to the macro base station at the place, base station of described each adjacent small-cell, and receive described each adjacent small-cell that described macro base station sends described on off state information and described switching time information; Or described serving BS by downlink receiver read described each adjacent small-cell described on off state information and described switching time information.

In technique scheme, preferably, described terminal read or described serving BS by downlink receiver read described on off state information and described switching time information, specifically comprise: detect the cycle information of master sync signal information, auxiliary synchronous signals information and the CRS/CSI-RS of adjacent small-cell, with read described on off state information and described switching time information; And/or the Radio Resource control information of reading the macrocell at adjacent small-cell and/or place, adjacent small-cell, and/or reading media access control layer information and/or physical layer information, with read described on off state information and described switching time information.

In this technical scheme, serving BS obtain adjacent small-cell on off state and switching time information method include, but are not limited to following mode: 1, read the on off state of adjacent small-cell and the information of switching time by switching terminal, report to serving BS.This report can send together with signal strength measurement report.Wherein, terminal reading information comprises: PSS (the Primary Synchronization Signal that detects adjacent small-cell, master sync signal)/SSS (Secondary Synchronization Signal, auxiliary synchronous signals) and CRS (Cell-specific Reference Signal, cell reference signals) cycle of/CSI-RS (Channel State Information Reference Signal, channel state information reference signals); Detect RRC (the Radio Resource Control of adjacent small-cell or place, adjacent small-cell macrocell, Radio Resource control) information (comprising system information), MAC (Medium Access Control, media access control) layer information and/or physical layer information.When the system information that detects adjacent small-cell or its place macrocell when terminal obtains on off state and switching time, need adjacent small-cell or its place macrocell system information send its on off state and switching time information.2, serving BS by inter-base station interface obtain on off state information and switching time information, as serving BS send handover request to adjacent small-cell base station, adjacent small-cell base station by handover request answer signaling feed back its on off state and switching time information.3, serving BS by the macro base station at place, adjacent small-cell obtain on off state information and switching time information.If the switch of small-cell is all by macro base station control, so macro base station be have each small-cell on off state and switching time information, so macro base station can provide these information to serving BS.If the switch of small-cell also can oneself control, need so small-cell by the on off state of oneself and switching time information all inform macro base station, macro base station also can provide these information to serving BS like this.4, serving BS utilizes oneself downlink receiver, as terminal, go to read adjacent small-cell on off state and switching time information.Serving BS reading information comprises: the cycle of detecting PSS/SSS and the CRS/CSI-RS of adjacent small-cell; Detect rrc message (comprising system information), MAC layer information and/or the physical layer information of adjacent small-cell or place, adjacent small-cell macrocell.When the system information that detects adjacent small-cell or its place macrocell when serving BS obtains on off state and switching time, need adjacent small-cell or its place macrocell system information send its on off state and switching time information.

In technique scheme, preferably, described in described basis the on off state information of each adjacent small-cell and switching time information, from described multiple adjacent small-cells, select the target small-cell that described terminal is about to incision, specifically comprise: according to the on off state information of the expectation switching instant of described terminal and described each adjacent small-cell, described multiple adjacent small-cells are divided into the first adjacent small-cell and the second adjacent small-cell, wherein, described the first adjacent small-cell is the adjacent small-cell in opening at described expectation switching instant, described the second adjacent small-cell is the adjacent small-cell in closed condition at described expectation switching instant, information switching time of at least one adjacent small-cell in described the first adjacent small-cell is compared, from described at least one adjacent small-cell, select from described expectation switching instant and start to remain the longest first object small-cell of opening time, information switching time of at least one adjacent small-cell in described the second adjacent small-cell is compared, from described at least one adjacent small-cell, select the second the shortest target small-cell of following start-up time and described expectation switching instant interval, whether the residue opening time that judges described first object small-cell is greater than the default opening time, in judged result when being, select described first object small-cell as described target small-cell, otherwise, select described the second target small-cell as described target small-cell.

In this technical scheme, adjacent small-cell is divided into two classes according to the on off state of a certain particular moment, this particular moment refers at this switching terminal and receives after the switching command of serving BS, prepares the moment of the random access of carrying out Target cell, estimates switching instant.The adjacent small-cell of two classes mainly refers to: at this expectation switching instant, and the adjacent small-cell of the first kind in opening; At this expectation switching instant, the adjacent small-cell of Equations of The Second Kind in closed condition.Then from the adjacent small-cell of the first kind, select from estimating switching instant, the adjacent small-cell of first object that the residue opening time is the longest, and from Equations of The Second Kind small-cell, select its following start-up time and estimate the adjacent small-cell of the second the shortest target, switching instant interval, thereby guarantee terminal can be cut target small-cell fast, again adjacent two targets selecting small-cell is compared, if the residue opening time of first object small-cell is shorter, just select the second target small-cell to cut, if the residue opening time long enough of first object small-cell, can select this first object small-cell, thereby without wait, can directly cut, fast quick-recovery communication.

In technique scheme, preferably, the on off state information of each adjacent small-cell described in described basis, described switching time information and described signal strength information, from described multiple adjacent small-cells, select the target small-cell that described terminal is about to incision, specifically comprise: according to the on off state information of the expectation switching instant of described terminal and described each adjacent small-cell, described multiple adjacent small-cells are divided into the first adjacent small-cell and the second adjacent small-cell, wherein, described the first adjacent small-cell is the adjacent small-cell in opening at described expectation switching instant, described the second adjacent small-cell is the adjacent small-cell in closed condition at described expectation switching instant, by at least one adjacent small-cell in described the first adjacent small-cell switching time information and signal strength information compare, from described at least one adjacent small-cell, select from described expectation switching instant and start to remain the first object small-cell that the opening time is the longest and signal strength signal intensity is the strongest, by at least one adjacent small-cell in described the second adjacent small-cell switching time information and signal strength information compare, from described at least one adjacent small-cell, select following start-up time and described expectation switching instant interval is the shortest and signal strength signal intensity is the strongest the second target small-cell, whether the residue opening time that judges described first object small-cell is greater than the default opening time, in judged result when being, select described first object small-cell as described target small-cell, otherwise, select described the second target small-cell as described target small-cell.

In this technical scheme, carrying out can also considering when Target cell is selected on off state information, switching time information and signal strength information, select most suitable Target cell according to the on off state of adjacent small-cell, switching time and signal strength signal intensity.Such as, multiple adjacent small-cells are approximate aspect on off state and switching time, if two adjacent small-cells are all in opening, and residue opening time difference is little, now, can select adjacent small-cell that signal strength signal intensity is stronger as Target cell.Thereby make the Target cell of selecting both have stronger signal strength signal intensity, quick-recovery communication soon again, lifting user's experience.

According to a further aspect in the invention, a kind of community switching device shifter is also provided, for serving BS, comprise: acquiring unit, receiving after the measurement report of handover trigger that terminal sends, obtaining in described measurement report the on off state information of each adjacent small-cell and switching time information in multiple adjacent small-cells; Selected cell, according to the on off state information of described each adjacent small-cell and switching time information, from described multiple adjacent small-cells, select described terminal be about to incision target small-cell.

In technique scheme, preferably, described acquiring unit is also for the signal strength information that obtains each adjacent small-cell in the multiple adjacent small-cells of described measurement report; Described selected cell also for: according to the on off state information of described each adjacent small-cell, described switching time information and described signal strength information, from described multiple adjacent small-cells, select described terminal and be about to the target small-cell of incision.

In technique scheme, preferably, acquiring unit specifically for: receive each adjacent small-cell that described terminal reads described on off state information and described switching time information; Or send handover request to the base station of described each adjacent small-cell, and the base station that receives described each adjacent small-cell by handover request answers described on off state information that signaling feeds back and described switching time information; Or the macro base station to the place, base station of described each adjacent small-cell sends information acquisition request, and receive described each adjacent small-cell that described macro base station sends described on off state information and described switching time information; Or by downlink receiver read described each adjacent small-cell described on off state information and described switching time information.

In technique scheme, preferably, described acquiring unit also comprises: detecting unit, detect the cycle information of master sync signal information, auxiliary synchronous signals information and the CRS/CSI-RS of adjacent small-cell, with read described on off state information and described switching time information; And/or reading unit, the Radio Resource control information of reading the macrocell at adjacent small-cell and/or place, adjacent small-cell, and/or reading media access control layer information and/or physical layer information, with read described on off state information and described switching time information.

In this technical scheme, serving BS obtain adjacent small-cell on off state and switching time information method include, but are not limited to following mode: 1, read the on off state of adjacent small-cell and the information of switching time by switching terminal, report to serving BS.This report can send together with signal strength measurement report.Wherein, terminal reading information comprises: the cycle of detecting PSS/SSS and the CRS/CSI-RS of adjacent small-cell; Detect rrc message (comprising system information), MAC layer information and/or the physical layer information of adjacent small-cell or place, adjacent small-cell macrocell.When the system information that detects adjacent small-cell or its place macrocell when terminal obtains on off state and switching time, need adjacent small-cell or its place macrocell system information send its on off state and switching time information.2, serving BS by inter-base station interface obtain on off state information and switching time information, as serving BS send handover request to adjacent small-cell base station, adjacent small-cell base station by handover request answer signaling feed back its on off state and switching time information.3, serving BS by the macro base station at place, adjacent small-cell obtain on off state information and switching time information.If the switch of small-cell is all by macro base station control, so macro base station be have each small-cell on off state and switching time information, so macro base station can provide these information to serving BS.If the switch of small-cell also can oneself control, need so small-cell by the on off state of oneself and switching time information all inform macro base station, macro base station also can provide these information to serving BS like this.4, serving BS utilizes oneself downlink receiver, as terminal, go to read adjacent small-cell on off state and switching time information.Serving BS reading information comprises: the cycle of detecting PSS/SSS and the CRS/CSI-RS of adjacent small-cell; Detect rrc message (comprising system information), MAC layer information and/or the physical layer information of adjacent small-cell or place, adjacent small-cell macrocell.When the system information that detects adjacent small-cell or its place macrocell when serving BS obtains on off state and switching time, need adjacent small-cell or its place macrocell system information send its on off state and switching time information.

In technique scheme, preferably, described selected cell specifically comprises: division unit, according to the on off state information of the expectation switching instant of described terminal and described each adjacent small-cell, described multiple adjacent small-cells are divided into the first adjacent small-cell and the second adjacent small-cell, wherein, described the first adjacent small-cell is the adjacent small-cell in opening at described expectation switching instant, and described the second adjacent small-cell is the adjacent small-cell in closed condition at described expectation switching instant; The first comparing unit, compares information switching time of at least one adjacent small-cell in described the first adjacent small-cell, from described at least one adjacent small-cell, selects from described expectation switching instant and starts to remain the longest first object small-cell of opening time; The second comparing unit, compares information switching time of at least one adjacent small-cell in described the second adjacent small-cell, selects the second the shortest target small-cell of following start-up time and described expectation switching instant interval from described at least one adjacent small-cell; Community selected cell, whether the residue opening time that judges described first object small-cell is greater than the default opening time, when being, selects described first object small-cell as described target small-cell in judged result, otherwise, select described the second target small-cell as described target small-cell.

In technique scheme, preferably, described selected cell also comprises: division unit, according to the on off state information of the expectation switching instant of described terminal and described each adjacent small-cell, described multiple adjacent small-cells are divided into the first adjacent small-cell and the second adjacent small-cell, wherein, described the first adjacent small-cell is the adjacent small-cell in opening at described expectation switching instant, and described the second adjacent small-cell is the adjacent small-cell in closed condition at described expectation switching instant; The first comparing unit, by at least one adjacent small-cell in described the first adjacent small-cell switching time information and signal strength information compare, from described at least one adjacent small-cell, select from described expectation switching instant and start to remain the first object small-cell that the opening time is the longest and signal strength signal intensity is the strongest; The second comparing unit, by at least one adjacent small-cell in described the second adjacent small-cell switching time information and signal strength information compare, from described at least one adjacent small-cell, select following start-up time and described expectation switching instant interval is the shortest and signal strength signal intensity is the strongest the second target small-cell; Community selected cell, whether the residue opening time that judges described first object small-cell is greater than the default opening time, when being, selects described first object small-cell as described target small-cell in judged result, otherwise, select described the second target small-cell as described target small-cell.

In accordance with a further aspect of the present invention, also provide a kind of community switching device shifter, for terminal, having comprised: reading unit, read each adjacent small-cell in multiple adjacent small-cells on off state information and switching time information; Transmitting element, by described on off state information and described switching time information be sent to serving BS.

In this technical scheme, need to obtain the switching time of information and when on off state information at serving BS, terminal can read the on off state of adjacent small-cell and the information of switching time, reports to serving BS.This report can send together with signal strength measurement report.

In technique scheme, preferably, described reading unit specifically for: detect the cycle information of master sync signal information, auxiliary synchronous signals information and the CRS/CSI-RS of adjacent small-cell, with read described on off state information and described switching time information; And/or the Radio Resource control information of reading the macrocell at adjacent small-cell and/or place, adjacent small-cell, and/or reading media access control layer information and/or physical layer information, with read described on off state information and described switching time information.

In this technical scheme, terminal reading information comprises: the cycle of detecting PSS/SSS and the CRS/CSI-RS of adjacent small-cell; Detect rrc message (comprising system information), MAC layer information and/or the physical layer information of adjacent small-cell or place, adjacent small-cell macrocell.When the system information that detects adjacent small-cell or its place macrocell when terminal obtains on off state and switching time, need adjacent small-cell or its place macrocell system information send its on off state and switching time information.

In accordance with a further aspect of the present invention, also provide a kind of serving BS, having comprised: the community switching device shifter for serving BS described in any one in technique scheme.This serving BS has identical technique effect with the above-mentioned community switching device shifter for serving BS, does not repeat them here.

In accordance with a further aspect of the present invention, also provide a kind of terminal, having comprised: described in technique scheme for the community switching device shifter of terminal.This terminal has identical technique effect with the above-mentioned community switching device shifter for terminal, does not repeat them here.

By above technical scheme, can make to need the terminal of switching cell can cut as soon as possible Target cell, recover as early as possible communication, thereby reduce HO-break duration, promote user's experience.

Brief description of the drawings

Fig. 1 shows the flow chart of cell switching method according to an embodiment of the invention;

Fig. 2 shows the block diagram of community according to an embodiment of the invention switching device shifter;

Fig. 3 shows the block diagram of community switching device shifter according to another embodiment of the invention;

Fig. 4 shows the block diagram of serving BS according to an embodiment of the invention;

Fig. 5 shows the block diagram of terminal according to an embodiment of the invention;

Fig. 6 shows the particular flow sheet of cell switching method according to an embodiment of the invention;

Fig. 7 show adjacent small-cell according to an embodiment of the invention on off state and switching time schematic diagram;

Fig. 8 shows the schematic diagram of adjacent small-cell system of selection according to an embodiment of the invention;

Fig. 9 shows the schematic diagram of adjacent small-cell system of selection according to another embodiment of the invention;

Figure 10 show on off state information according to an embodiment of the invention and switching time information acquisition process schematic diagram.

Embodiment

In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine mutually.

A lot of details are set forth in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not subject to the restriction of following public specific embodiment.

Fig. 1 shows the flow chart of cell switching method according to an embodiment of the invention.

As shown in Figure 1, cell switching method according to an embodiment of the invention, comprise: step 102, serving BS is receiving after the measurement report of handover trigger that terminal sends, and obtains in described measurement report the on off state information of each adjacent small-cell and switching time information in multiple adjacent small-cells; Step 104, described serving BS according to the on off state information of described each adjacent small-cell and switching time information, from described multiple adjacent small-cells, select described terminal be about to incision target small-cell.

Fig. 2 shows the block diagram of community according to an embodiment of the invention switching device shifter.

As shown in Figure 2, community according to an embodiment of the invention switching device shifter 200, for serving BS, comprise: acquiring unit 202, receiving after the measurement report of handover trigger that terminal sends, obtaining in described measurement report the on off state information of each adjacent small-cell and switching time information in multiple adjacent small-cells; Selected cell 204, according to the on off state information of described each adjacent small-cell and switching time information, from described multiple adjacent small-cells, select described terminal be about to incision target small-cell.

In technique scheme, preferably, described acquiring unit 202 is also for the signal strength information that obtains each adjacent small-cell in the multiple adjacent small-cells of described measurement report; Described selected cell 204 also for: according to the on off state information of described each adjacent small-cell, described switching time information and described signal strength information, from described multiple adjacent small-cells, select described terminal and be about to the target small-cell of incision.

In technique scheme, preferably, acquiring unit 202 specifically for: receive each adjacent small-cell that described terminal reads described on off state information and described switching time information; Or send handover request to the base station of described each adjacent small-cell, and the base station that receives described each adjacent small-cell by handover request answers described on off state information that signaling feeds back and described switching time information; Or the macro base station to the place, base station of described each adjacent small-cell sends information acquisition request, and receive described each adjacent small-cell that described macro base station sends described on off state information and described switching time information; Or by downlink receiver read described each adjacent small-cell described on off state information and described switching time information.

In technique scheme, preferably, described acquiring unit 202 also comprises: detecting unit 2022, detect the cycle information of master sync signal information, auxiliary synchronous signals information and the CRS/CSI-RS of adjacent small-cell, with read described on off state information and described switching time information; And/or reading unit 2024, the Radio Resource control information of reading the macrocell at adjacent small-cell and/or place, adjacent small-cell, and/or reading media access control layer information and/or physical layer information, with read described on off state information and described switching time information.

In technique scheme, preferably, described selected cell 204 specifically comprises: division unit 2042, according to the on off state information of the expectation switching instant of described terminal and described each adjacent small-cell, described multiple adjacent small-cells are divided into the first adjacent small-cell and the second adjacent small-cell, wherein, described the first adjacent small-cell is the adjacent small-cell in opening at described expectation switching instant, and described the second adjacent small-cell is the adjacent small-cell in closed condition at described expectation switching instant; The first comparing unit 2044, information switching time of at least one adjacent small-cell in described the first adjacent small-cell is compared, from described at least one adjacent small-cell, select from described expectation switching instant and start to remain the longest first object small-cell of opening time; The second comparing unit 2046, information switching time of at least one adjacent small-cell in described the second adjacent small-cell is compared, from described at least one adjacent small-cell, select the second the shortest target small-cell of following start-up time and described expectation switching instant interval; Community selected cell 2048, whether the residue opening time that judges described first object small-cell is greater than the default opening time, when being, selects described first object small-cell as described target small-cell in judged result, otherwise, select described the second target small-cell as described target small-cell.

In technique scheme, preferably, described selected cell 204 also comprises: division unit 2042, according to the on off state information of the expectation switching instant of described terminal and described each adjacent small-cell, described multiple adjacent small-cells are divided into the first adjacent small-cell and the second adjacent small-cell, wherein, described the first adjacent small-cell is the adjacent small-cell in opening at described expectation switching instant, and described the second adjacent small-cell is the adjacent small-cell in closed condition at described expectation switching instant; The first comparing unit 2044, by at least one adjacent small-cell in described the first adjacent small-cell switching time information and signal strength information compare, from described at least one adjacent small-cell, select from described expectation switching instant and start to remain the first object small-cell that the opening time is the longest and signal strength signal intensity is the strongest; The second comparing unit 2046, by at least one adjacent small-cell in described the second adjacent small-cell switching time information and signal strength information compare, from described at least one adjacent small-cell, select following start-up time and described expectation switching instant interval is the shortest and signal strength signal intensity is the strongest the second target small-cell; Community selected cell 2048, whether the residue opening time that judges described first object small-cell is greater than the default opening time, when being, selects described first object small-cell as described target small-cell in judged result, otherwise, select described the second target small-cell as described target small-cell.

Fig. 3 shows the block diagram of community switching device shifter according to another embodiment of the invention.

As shown in Figure 3, community switching device shifter 300 according to another embodiment of the invention, for terminal, comprising: reading unit 302, read each adjacent small-cell in multiple adjacent small-cells on off state information and switching time information; Transmitting element 304, by described on off state information and described switching time information be sent to serving BS.

In technique scheme, preferably, described reading unit 302 specifically for: detect the cycle information of master sync signal information, auxiliary synchronous signals information and the CRS/CSI-RS of adjacent small-cell, with read described on off state information and described switching time information; And/or the Radio Resource control information of reading the macrocell at adjacent small-cell and/or place, adjacent small-cell, and/or reading media access control layer information and/or physical layer information, with read described on off state information and described switching time information.

Fig. 4 shows the block diagram of serving BS according to an embodiment of the invention.

As shown in Figure 4, serving BS 400 according to an embodiment of the invention, comprising: the community switching device shifter 200 for serving BS described in any one in technique scheme.This serving BS has identical technique effect with the above-mentioned community switching device shifter 200 for serving BS, does not repeat them here.

Fig. 5 shows the block diagram of terminal according to an embodiment of the invention.

As shown in Figure 5, terminal 500 according to an embodiment of the invention, comprising: described in technique scheme for the community switching device shifter 300 of terminal.This terminal has identical technique effect with the above-mentioned community switching device shifter 300 for terminal, does not repeat them here.

Describe technical scheme of the present invention in detail below in conjunction with Fig. 6 to Figure 10.

As shown in Figure 6, the idiographic flow of cell switching method comprises according to an embodiment of the invention:

Step 602, serving BS receives the signal strength measurement report that terminal sends.

Step 604, serving BS receiving after user's handover trigger measurement report, obtain the adjacent small-cell in measurement report on off state and switching time information.Serving BS is considered on off state and the switching time of adjacent small-cell, and/or the signal strength signal intensity of each adjacent small-cell in measurement report, for this switching user selects best target small-cell.

Serving BS considers the on off state of adjacent small-cell and switching time and the step of select target community comprises:

Step 606, is divided into first and second liang of classes by adjacent small-cell according to the on off state of a certain particular moment, and this particular moment refers to this switching user and receives after the switching command of serving BS, prepares the moment of the random access of carrying out Target cell, estimates switching instant.The adjacent small-cell of two classes mainly refers to: Class A (being the first kind) referred in this moment, in the adjacent small-cell of opening; Class B (being Equations of The Second Kind) referred in this moment, in the adjacent small-cell of closed condition.Wherein, as shown in Figure 7, when user's (being terminal) #1 is in the time that t2 is ready at all times to carry out random access, adjacent small-cell #1 is in opening on off state example, and so for user #1, adjacent small-cell #1 should be divided into Class A.When user #2 is in the time that t4 is ready at all times to carry out random access, adjacent small-cell #1 is in closed condition, and so for user #2, adjacent small-cell #1 should be divided into Class B.

Step 608, serving BS is selected best adjacent small-cell, Class A according to residue opening time length.Class A selection criterion: the adjacent small-cell of selecting enough this users of residue opening time to complete handoff procedure.Handoff procedure mainly refers to random access procedure, comprise based on competition random access procedure and the random access procedure based on non-competing.In these communities, further, select residue the longest adjacent small-cell of opening time.

Wherein, as shown in Figure 7, when user #1 is in the time that t2 is ready at all times to carry out random access, adjacent small-cell #1 is in opening for residue opening time example, and its residue opening time refers to this period of time of t3-t2, i.e. the following also time in continuous opening.Here suppose that each opening time continues 100ms, i.e. this period of time of t3-t1.

Step 610, serving BS is selected the best adjacent small-cell of Class B according to the length of distance following start-up time time.Class B selection criterion: the adjacent small-cell of the following start-up time shortest time of chosen distance.

Wherein, the following start-up time time example of distance as shown in Figure 7, when user #2 is in the time that t4 is ready at all times to carry out random access, adjacent small-cell #1 is in closed condition, it refers to this period of time of t5-t4 apart from the following start-up time time, be future how long after, this community will enter opening.Here suppose that each shut-in time continues 100ms, i.e. this period of time of t5-t3.(wherein, refer to residue opening time and/or following start-up time time of distance the switching time of indication of the present invention.) the further best adjacent small-cell of best adjacent small-cell, Class A and Class B relatively.

Step 612, serving BS is selected best adjacent small-cell as Target cell, after serving BS chooses Target cell, sends switching command to this switching terminal, and terminal is received switching command, starts handoff procedure, and completes handoff procedure, recovers communication.Particularly, if best adjacent small-cell, Class A completes after handoff procedure switching user, also have long time in opening, be convenient to the fast quick-recovery communication of user, select so best adjacent small-cell, Class A as Target cell; If the residue opening time of best adjacent small-cell, Class A completes the handoff procedure that switches user not, or can enter closed condition having completed after the handoff procedure that switches user at once; And the best adjacent small-cell of Class B can enter long opening at short notice, select so the best adjacent small-cell of Class B as Target cell.

Describe the system of selection of Target cell of the present invention in detail below in conjunction with two specific embodiments.

Embodiment 1: provide below an example 1 based on off state and select target switching time community:

When user is in the time that the time is prepared random access as shown in Figure 8, adjacent small-cell #1 and #2 are in opening, and adjacent small-cell #3 and #4 are in closed condition.

The adjacent small-cell classification of class AB situation is as follows so: Class A is #1 and #2, and Class B is #3 and #4.

Select best adjacent small-cell, Class A according to the residue opening time: the residue opening time of adjacent small-cell #2 is longer, so that adjacent small-cell #2 is chosen as Class A is best.

According to the distance best adjacent small-cell of following start-up time selection of time Class B: adjacent small-cell #3 is apart from following start-up time shortest time, so that adjacent small-cell #3 is chosen as Class B is best.

Relatively Class A preferably and Class B best, the residue opening time of the best adjacent small-cell #2 in Class A is enough long, so adjacent small-cell #2 is chosen as Target cell.

Embodiment 2: provide below an example 2 based on off state and select target switching time community.

When user is in the time that the time is prepared random access as shown in Figure 9, adjacent small-cell #1 and #2 are in opening, and adjacent small-cell #3 and #4 are in closed condition.

Relatively Class A is preferably best with Class B, and the residue opening time of the best adjacent small-cell #2 in Class A is too short, and the best adjacent small-cell #3 horse back of Class B just can enter the opening time of long period, so adjacent small-cell #3 is chosen as Target cell.

Carrying out Target cell while selecting, except above-mentioned according on off state information and switching time information select, serving BS can also be combined and considered the signal strength signal intensity of on off state and switching time and adjacent small-cell and select target community.Particularly, serving BS is combined and is considered the signal strength signal intensity of on off state and switching time and adjacent small-cell and the criterion of select target community is as follows: if multiple adjacent small-cell is approximate aspect on off state and switching time, such as two adjacent small-cells are all in opening, and residue opening time difference is little, select so adjacent small-cell that signal strength signal intensity is strong as Target cell.

Wherein, in above-mentioned steps 604, serving BS obtain adjacent small-cell on off state and switching time information method comprise:

1, switching terminal reads the on off state of adjacent small-cell and the information of switching time, reports to serving BS.This report can send together with signal strength measurement report.

Terminal reading information comprises: detect the PSS/SSS of adjacent small-cell or the cycle of CRS/CSI-RS acquisition on off state; The rrc message (comprising system information), MAC layer information and/or the physical layer information that detect adjacent small-cell or place, adjacent small-cell macrocell obtain switching time.Comprise various implicit expression and explicit indication information.Wherein, when the system information that detects adjacent small-cell or its place macrocell as user obtains on off state and switching time, need adjacent small-cell or its place macrocell system information send its on off state and switching time information.

2, serving BS obtains (as shown in figure 10) by inter-base station interface (X2), as serving BS send handover request to adjacent small-cell base station, adjacent small-cell base station by handover request answer signaling feed back its on off state and switching time information.

3, serving BS obtains by the macro base station at place, adjacent small-cell.If the switch of small-cell is all by macro base station control, so macro base station be have each small-cell on off state and switching time information, so macro base station can provide these information to serving BS.If the switch of small-cell also can oneself control, need so small-cell by the on off state of oneself and switching time information all inform macro base station, macro base station also can provide these information to serving BS like this.

4, serving BS utilizes oneself downlink receiver, as terminal, go to read adjacent small-cell on off state and switching time information.

Serving BS reading information comprises: detect the PSS/SSS of adjacent small-cell or the cycle of CRS/CSI-RS acquisition on off state; The rrc message (comprising system information), MAC layer information and/or the physical layer information that detect adjacent small-cell or place, adjacent small-cell macrocell obtain switching time.Comprise various implicit expression and explicit indication information.Wherein, when the system information that detects adjacent small-cell or its place macrocell when serving BS obtains on off state and switching time, need adjacent small-cell or its place macrocell system information send its on off state and switching time information.

More than be described with reference to the accompanying drawings technical scheme of the present invention, due in correlation technique, do not consider the on off state of community, so may choose a community of closing as Target cell, when user must wait Target cell to open like this, could access Target cell, recover communication, so make HO-break duration elongated.Serving BS in the present invention by user report, adjacent small-cell base station, adjacent small-cell place macro base station or by the receiver of self obtain adjacent small-cell on off state and switching time information.Further, based on adjacent small-cell, adjacent small-cell is divided into first and second liang of classes by the on off state in the time that user prepares to be linked into Target cell at random to serving BS, and select best adjacent small-cell, Class A according to residue opening time length, according to select the best adjacent small-cell of Class B from the length of following start-up time time, finally select in all adjacent small-cells best as Target cell.Thereby make to switch user and can access as soon as possible Target cell, recover as early as possible communication, thereby reduce HO-break duration, improve user and experience.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims

1. a cell switching method, is characterized in that, comprising:

Serving BS is receiving after the measurement report of handover trigger that terminal sends, and obtains in described measurement report the on off state information of each adjacent small-cell and switching time information in multiple adjacent small-cells;

Described serving BS according to the on off state information of described each adjacent small-cell and switching time information, from described multiple adjacent small-cells, select described terminal be about to incision target small-cell.

2. cell switching method according to claim 1, is characterized in that, also comprises:

Described serving BS obtains in described measurement report the signal strength information of each adjacent small-cell in multiple adjacent small-cells;

Described serving BS is according to the on off state information of described each adjacent small-cell, described switching time information and described signal strength information, selects described terminal and be about to the target small-cell of incision from described multiple adjacent small-cells.

3. cell switching method according to claim 1, is characterized in that, described serving BS obtains in described measurement report the on off state information of each adjacent small-cell and switching time information in multiple adjacent small-cells, specifically comprises:

Terminal read each adjacent small-cell described on off state information and described switching time information, and by described on off state information and described switching time information be sent to described serving BS so that described serving BS get described on off state information and described switching time information; Or

Described serving BS sends handover request to the base station of described each adjacent small-cell, and the base station that receives described each adjacent small-cell by handover request answers described on off state information that signaling feeds back and described switching time information; Or

Described serving BS sends information acquisition request to the macro base station at the place, base station of described each adjacent small-cell, and receive described each adjacent small-cell that described macro base station sends described on off state information and described switching time information; Or

Described serving BS by downlink receiver read described each adjacent small-cell described on off state information and described switching time information.

4. cell switching method according to claim 3, is characterized in that, described terminal read or described serving BS by downlink receiver read described on off state information and described switching time information, specifically comprise:

Detect the cycle information of master sync signal information, auxiliary synchronous signals information and cell reference signals or the channel state information reference signals of adjacent small-cell, with read described on off state information and described switching time information; And/or

Read the Radio Resource control information of the macrocell at adjacent small-cell and/or place, adjacent small-cell, and/or reading media access control layer information and/or physical layer information, with read described on off state information and described switching time information.

5. cell switching method according to claim 1, it is characterized in that, described in described basis the on off state information of each adjacent small-cell and switching time information, from described multiple adjacent small-cells, select described terminal be about to incision target small-cell, specifically comprise:

According to the on off state information of the expectation switching instant of described terminal and described each adjacent small-cell, described multiple adjacent small-cells are divided into the first adjacent small-cell and the second adjacent small-cell, wherein, described the first adjacent small-cell is the adjacent small-cell in opening at described expectation switching instant, and described the second adjacent small-cell is the adjacent small-cell in closed condition at described expectation switching instant;

Information switching time of at least one adjacent small-cell in described the first adjacent small-cell is compared, from described at least one adjacent small-cell, select from described expectation switching instant and start to remain the longest first object small-cell of opening time;

Information switching time of at least one adjacent small-cell in described the second adjacent small-cell is compared, from described at least one adjacent small-cell, select the second the shortest target small-cell of following start-up time and described expectation switching instant interval;

Whether the residue opening time that judges described first object small-cell is greater than the default opening time, in judged result when being, select described first object small-cell as described target small-cell, otherwise, select described the second target small-cell as described target small-cell.

6. cell switching method according to claim 2, it is characterized in that, the on off state information of each adjacent small-cell described in described basis, described switching time information and described signal strength information, from described multiple adjacent small-cells, select the target small-cell that described terminal is about to incision, specifically comprise:

By at least one adjacent small-cell in described the first adjacent small-cell switching time information and signal strength information compare, from described at least one adjacent small-cell, select from described expectation switching instant and start to remain the first object small-cell that the opening time is the longest and signal strength signal intensity is the strongest;

By at least one adjacent small-cell in described the second adjacent small-cell switching time information and signal strength information compare, from described at least one adjacent small-cell, select following start-up time and described expectation switching instant interval is the shortest and signal strength signal intensity is the strongest the second target small-cell;

7.Yi Zhong community switching device shifter, for serving BS, is characterized in that, comprising:

Acquiring unit, is receiving after the measurement report of handover trigger that terminal sends, and obtains in described measurement report the on off state information of each adjacent small-cell and switching time information in multiple adjacent small-cells;

Selected cell, according to the on off state information of described each adjacent small-cell and switching time information, from described multiple adjacent small-cells, select described terminal be about to incision target small-cell.

8. community according to claim 7 switching device shifter, is characterized in that, described acquiring unit also for:

Obtain in described measurement report the signal strength information of each adjacent small-cell in multiple adjacent small-cells;

Described selected cell also for:

According to the on off state information of described each adjacent small-cell, described switching time information and described signal strength information, from described multiple adjacent small-cells, select described terminal and be about to the target small-cell of incision.

9. community according to claim 7 switching device shifter, is characterized in that, acquiring unit specifically for:

Receive each adjacent small-cell that described terminal reads described on off state information and described switching time information; Or

Send handover request to the base station of described each adjacent small-cell, and the base station that receives described each adjacent small-cell by handover request answers described on off state information that signaling feeds back and described switching time information; Or

Macro base station to the place, base station of described each adjacent small-cell sends information acquisition request, and receive described each adjacent small-cell that described macro base station sends described on off state information and described switching time information; Or

By downlink receiver read described each adjacent small-cell described on off state information and described switching time information.

10. community according to claim 9 switching device shifter, is characterized in that, described acquiring unit also comprises:

Detecting unit, detects the cycle information of master sync signal information, auxiliary synchronous signals information and cell reference signals or the channel state information reference signals of adjacent small-cell, with read described on off state information and described switching time information; And/or

Reading unit, the Radio Resource control information of reading the macrocell at adjacent small-cell and/or place, adjacent small-cell, and/or reading media access control layer information and/or physical layer information, with read described on off state information and described switching time information.

11. community according to claim 7 switching device shifters, is characterized in that, described selected cell specifically comprises:

Division unit, according to the on off state information of the expectation switching instant of described terminal and described each adjacent small-cell, described multiple adjacent small-cells are divided into the first adjacent small-cell and the second adjacent small-cell, wherein, described the first adjacent small-cell is the adjacent small-cell in opening at described expectation switching instant, and described the second adjacent small-cell is the adjacent small-cell in closed condition at described expectation switching instant;

The first comparing unit, compares information switching time of at least one adjacent small-cell in described the first adjacent small-cell, from described at least one adjacent small-cell, selects from described expectation switching instant and starts to remain the longest first object small-cell of opening time;

The second comparing unit, compares information switching time of at least one adjacent small-cell in described the second adjacent small-cell, selects the second the shortest target small-cell of following start-up time and described expectation switching instant interval from described at least one adjacent small-cell;

Community selected cell, whether the residue opening time that judges described first object small-cell is greater than the default opening time, when being, selects described first object small-cell as described target small-cell in judged result, otherwise, select described the second target small-cell as described target small-cell.

12. community according to claim 8 switching device shifters, is characterized in that, described selected cell also comprises:

The first comparing unit, by at least one adjacent small-cell in described the first adjacent small-cell switching time information and signal strength information compare, from described at least one adjacent small-cell, select from described expectation switching instant and start to remain the first object small-cell that the opening time is the longest and signal strength signal intensity is the strongest;

The second comparing unit, by at least one adjacent small-cell in described the second adjacent small-cell switching time information and signal strength information compare, from described at least one adjacent small-cell, select following start-up time and described expectation switching instant interval is the shortest and signal strength signal intensity is the strongest the second target small-cell;

13.Yi Zhong community switching device shifter, for terminal, is characterized in that, comprising:

Reading unit, read each adjacent small-cell in multiple adjacent small-cells on off state information and switching time information;

Transmitting element, by described on off state information and described switching time information be sent to serving BS.

14. community according to claim 13 switching device shifters, is characterized in that, described reading unit specifically for:

15. 1 kinds of serving BSs, is characterized in that, comprising: the community switching device shifter as described in any one in claim 7 to 12.

16. 1 kinds of terminals, is characterized in that, comprising: the community switching device shifter as described in claim 13 and 14.