CN102325353A - Method, equipment and system for selecting target cell during handover - Google Patents
Method, equipment and system for selecting target cell during handover Download PDFInfo
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- CN102325353A CN102325353A CN201110198666A CN201110198666A CN102325353A CN 102325353 A CN102325353 A CN 102325353A CN 201110198666 A CN201110198666 A CN 201110198666A CN 201110198666 A CN201110198666 A CN 201110198666A CN 102325353 A CN102325353 A CN 102325353A
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Abstract
The invention provides a method for selecting a target cell during handover. The target cell is selected according to the load and the signal quality of neighbor cells, the handover is not conducted according to an artificially set target cell and the quality of cell handover is improved. The method comprises the steps of: obtaining the reference signal received power (RSRP) information of the current neighbor cells and the serving cell of a terminal; and selecting the target cell for the terminal according to the obtained current load information of the neighbor cells of the terminal and the obtained RSRP information of the neighbor cells and the serving cell. The invention additionally provides corresponding equipment and a corresponding system, which can be used for making comparisons between the cell load and downlink signal quality to find out a high-quality cell for handover.
Description
Technical field
The present invention relates to the LTE communication technical field, relate in particular to a kind of in handoff procedure method of selecting target cell, equipment and system.
Background technology
In the LTE communication system, the S1 interface is the communication interface between base station and the packet-based core networks, and X2 is the communication interface between base station and the base station.S1 and X2 interface are two the most basic interfaces, carry out in the moving process at the terminal, two kinds of switching modes are generally arranged: switch through S1 interface or X2 interface.
In the prior art, select adjacent sub-district as Target cell according to the measurement and report of UE, handover triggering condition reasonable in design should avoid triggering unnecessary handoff procedure, avoids conversation loss again.When Target cell and the cell-of-origin selected belong to different base station; The certain determination methods of source base station judges that carrying out X2 port switching X2-based handover still is that the S1 port switches S1-based handover, promptly sends handoff request message to target BS and still sends handoff request message to MME.Switching mode mainly is to pass through the adjacent sub-district of the OMC of operation maintenance center manual configuration according to geography information at present, and through OMC parameters such as switching mode, affair, handoff threshold, switching delay time is set.
Referring to shown in Figure 1, the detailed process of switching through the terminal to report measurement report is following:
S101, measurement configuration message is sent to the terminal in the base station.
S102, the terminal is measured after receiving measurement configuration message, and the return measurement report is to the base station.
S103, the opening timing device.
S104 selects to prepare the collection sub-district according to measurement report before timer expiry.
S105, switching also is based on S1 port S1-based switching based on X2 port x 2-based in the base station judges initiation.
S106, the select target sub-district.
S107 is according to preparing Handover Request Acknowledge (HANDOVER REQUESTACK) the response message select target sub-district that reply the collection sub-district; As select success then to get into step 107; Like unsuccessful then process ends.
S108 sends the switching cell order.
Along with the expansion of sub-district in the network and number of base stations, quality of handoff is also more and more important.In existing method, be that S1 or X2 switch just, switch to the adjacent sub-district of the artificial setting of terminal to report, can not change according to actual conditions, thereby cause handover success rate not high through fixed configurations in the adjacent area.Manually according to the adjacent sub-district of geographical information configuration, the adjacent sub-district situation of can not the real reaction terminal measuring can not switch to the adjacent sub-district that is more suitable for switching, and also influences handover success rate.
Summary of the invention
The object of the present invention is to provide a kind of in handoff procedure method of selecting target cell, base station and terminal, in order to improve success rate for switching.
The invention provides a kind of in handoff procedure method of selecting target cell, this method comprises:
Obtain the RSRP information of current adjacent sub-district, terminal and Serving cell;
According to the adjacent sub-district present load information at this terminal that obtains, and the RSRP information of said adjacent sub-district and Serving cell, be this select target sub-district, terminal.
The invention provides a kind of in handoff procedure method of selecting target cell; This method comprises: the RSRP information of Serving cell and adjacent sub-district is measured at the terminal, and the RSRP information reporting of Serving cell that measures and adjacent sub-district is carried out the selection of Target cell to the base station.
A kind of in handoff procedure the equipment of select target sub-district, this equipment comprises:
Acquiring unit is used to obtain the RSRP information of current adjacent sub-district, terminal and Serving cell;
Selected cell is used for the adjacent sub-district present load information according to this terminal that obtains, and the RSRP information of said adjacent sub-district and Serving cell, is this select target sub-district, terminal.
A kind of in handoff procedure the equipment of select target sub-district, this equipment comprises:
Measuring unit is used to measure the RSRP information of Serving cell and adjacent sub-district, and the RSRP information reporting of Serving cell that measures and adjacent sub-district is carried out the selection of Target cell to the base station.
In the embodiments of the invention, utilize the adjacent sub-district present load information at this terminal, and the RSRP information of said adjacent sub-district and Serving cell, be this select target sub-district, terminal.Adopt technical scheme of the present invention to realize that selecting better sub-district for the terminal switches, solved because of thinking the problem that switching cell is omitted better sub-district of setting.
Description of drawings
The flow chart that Fig. 1 switches for prior art;
Fig. 2 is the method flow diagram of the embodiment of the invention;
Fig. 3 is the concrete grammar flow chart of the embodiment of the invention;
Fig. 4 is the structural representation of the equipment of the embodiment of the invention;
Fig. 5 is the device structure sketch map of the embodiment of the invention;
Fig. 6 is the system configuration sketch map of the embodiment of the invention.
Embodiment
Adopt artificial configuration parameter in order to solve prior art, the people who switches to terminal to report is the neighbor cell that sets, and causes the not high problem of handover success rate.The adjacent sub-district present load information at this terminal that basis is obtained among the present invention program, and the RSRP information of said adjacent sub-district and Serving cell are this select target sub-district, terminal.
Below in conjunction with Figure of description the embodiment of the invention is described in further detail, as shown in Figure 2, the embodiment of the invention a kind of method of selecting target cell in handoff procedure, step comprises:
S201 obtains the RSRP information of current adjacent sub-district, terminal and Serving cell.
S202, according to the adjacent sub-district present load information at this terminal that obtains, and the RSRP information of said adjacent sub-district and Serving cell, be this select target sub-district, terminal.
Preferably; For this select target sub-district, terminal comprises: if present load does not surpass the adjacent sub-district of setting thresholding; Then according to the RSRP information of adjacent sub-district that surpass to set thresholding, the adjacent sub-district of selecting downlink signal quality to meet to impose a condition is as Target cell.Wherein, load-threshold is provided with through Operation and Maintenance OM.Through comparing and selecting, confirm that the less downlink signal quality again of load better cell as Target cell, has improved handover success rate and also can not omit the sub-district that is more suitable for.
Do not surpass the adjacent sub-district of setting thresholding if there is present load, then the load of adjacent sub-district is sorted, surpass from said present load and select the minimum adjacent sub-district of present load the adjacent sub-district of setting thresholding as Target cell.Adjacent cell load is sorted,, also can select to switch the raising success rate than the sub-district of high-quality even without finding load less than the adjacent sub-district of setting thresholding.
Preferably, if the adjacent sub-district that does not exist downlink signal quality to meet to impose a condition, then with the adjacent sub-district of finding certainly of terminal to report Target cell as this terminal.Do not having under the situation of qualified adjacent sub-district, but also switch the sub-district.
Preferably; Obtain the RSRP information of current adjacent sub-district, terminal and Serving cell; Comprise the adjacent sub-district of receiving terminal measurement and report and the RSRP information of Serving cell, with the RSRP information of adjacent sub-district that receives and Serving cell as the current adjacent sub-district, terminal and the RSRP information of Serving cell.The RSRP information of obtaining can be reacted downlink signal quality more accurately as the parameter of weighing downlink signal quality.
Preferably, obtain the adjacent sub-district present load information at this terminal, comprising: in setting the storage duration, adjacent sub-district present load information stores; The adjacent sub-district present load information of storage is carried out weighted average; The adjacent sub-district present load information that weighted average is obtained is as the adjacent sub-district present load information at terminal.Wherein, the definite of storage duration is provided with through OM.The load information that obtains is used for when switching, comparing to obtain the sub-district that loading condition is fit to and switches.
Referring to Fig. 3, be the idiographic flow of the embodiment of the invention.
S301 is in setting the storage duration, with adjacent sub-district present load information stores.
S302 carries out weighted average with the adjacent sub-district present load information of storage.
S303, the adjacent sub-district present load information that weighted average is obtained is as the adjacent sub-district present load information at terminal.
S304 judges whether present load has not and surpasses the adjacent sub-district of setting thresholding, then gets into step S305 in this way, as otherwise get into step S306.
S305, the RSRP information of Serving cell and adjacent sub-district is measured at the terminal, and the RSRP information reporting of Serving cell that measures and adjacent sub-district is carried out the selection of Target cell to the base station, gets into step 307 then.
S306 sorts the load of adjacent sub-district, surpasses from said present load and selects the minimum adjacent sub-district of present load as Target cell the adjacent sub-district of setting thresholding.
S307 judges the difference of the RSRP of the Serving cell measure and adjacent sub-district, and when the difference of the RSRP of Serving cell and adjacent sub-district is less than first threshold, or the difference of the RSRP of Serving cell and adjacent sub-district then gets into step S308 during greater than second threshold value; Otherwise get into step S309.Wherein first threshold, second threshold value are provided with through OM.RSRP value through the rule comparison Serving cell set and adjacent sub-district can draw the high adjacent sub-district of downlink signal quality and switch.
S308 gives the base station with the RSRP information reporting of Serving cell that measures and adjacent sub-district.
Concrete; A timer can be set in advance; The difference of the Serving cell that in step S307, measures and the RSRP of adjacent sub-district satisfies less than first threshold, or the difference of the RSRP of Serving cell and adjacent sub-district is greater than second threshold value; And during timer expiry, then the RSRP information of the Serving cell that obtains of reporting measurement and adjacent sub-district is given the base station.The time that timer is set can be 80ms, 120ms, 160ms, 200ms, but can not be oversize.
S309 is with the adjacent sub-district of finding certainly of the terminal to report Target cell as this terminal.
S310 will meet the adjacent sub-district that imposes a condition as Target cell.
As shown in Figure 4, be device structure sketch map of the present invention.Equipment of the present invention comprises:
Acquiring unit 41 is used to obtain the RSRP information of current adjacent sub-district, terminal and Serving cell; Be further used in setting the storage duration, adjacent sub-district present load information stores; The adjacent sub-district present load information of storage is carried out weighted average; The adjacent sub-district present load information that weighted average is obtained is as the adjacent sub-district present load information at terminal.
Selected cell 42 is used for the adjacent sub-district present load information according to this terminal that obtains, and the RSRP information of said adjacent sub-district and Serving cell, is this select target sub-district, terminal; Also be used in present load and surpass set under the situation of adjacent sub-district of thresholding, according to the RSRP information that does not surpass the adjacent sub-district of setting thresholding, the adjacent sub-district of selecting downlink signal quality to meet to impose a condition is as Target cell; Do not surpass under the situation of the adjacent sub-district of setting thresholding in no present load, the load of adjacent sub-district is sorted, surpass from said present load and select the minimum adjacent sub-district of present load the adjacent sub-district of setting thresholding as Target cell; Be further used for again under the situation of the adjacent sub-district that does not exist downlink signal quality to meet to impose a condition, with the adjacent sub-district of finding certainly of terminal to report Target cell as this terminal.
As shown in Figure 5, be device structure sketch map of the present invention.Equipment of the present invention comprises:
Fig. 6 is the structural representation of system of the present invention:
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (16)
1. a method of selecting target cell in handoff procedure is characterized in that, this method comprises:
Obtain the Reference Signal Received Power RSRP information of current adjacent sub-district, terminal and Serving cell;
According to the adjacent sub-district present load information at this terminal that obtains, and the RSRP information of said adjacent sub-district and Serving cell, be this select target sub-district, terminal.
2. the method for claim 1 is characterized in that, is this select target sub-district, terminal, comprising:
If the adjacent sub-district of thresholding surpass is set in present load, then according to the RSRP information that surpasses the adjacent sub-district of setting thresholding, the adjacent sub-district of selecting downlink signal quality to meet to impose a condition is as Target cell.
3. method as claimed in claim 2 is characterized in that, does not surpass the adjacent sub-district of setting thresholding if there is present load, and this method further comprises:
The load of adjacent sub-district is sorted, surpass from said present load and select the minimum adjacent sub-district of present load the adjacent sub-district of setting thresholding as Target cell.
4. method as claimed in claim 2 is characterized in that, if the adjacent sub-district that does not exist downlink signal quality to meet to impose a condition, this method further comprises:
With the adjacent sub-district of finding certainly of terminal to report Target cell as this terminal.
5. the method for claim 1 is characterized in that, obtains the RSRP information of current adjacent sub-district, terminal and Serving cell, comprising:
The adjacent sub-district of receiving terminal measurement and report and the RSRP information of Serving cell, with the RSRP information of adjacent sub-district that receives and Serving cell as the current adjacent sub-district, terminal and the RSRP information of Serving cell.
6. the method for claim 1 is characterized in that, obtains the adjacent sub-district present load information at this terminal, comprising:
In setting the storage duration, with adjacent sub-district present load information stores;
The adjacent sub-district present load information of storage is carried out weighted average;
The adjacent sub-district present load information that weighted average is obtained is as the adjacent sub-district present load information at terminal.
7. a method of selecting target cell in handoff procedure is characterized in that, this method comprises:
The RSRP information of Serving cell and adjacent sub-district is measured at the terminal, and the RSRP information reporting of Serving cell that measures and adjacent sub-district is carried out the selection of Target cell to the base station.
8. method according to claim 7 is characterized in that, this method further comprises:
The difference of the Serving cell that judgement measures and the RSRP of adjacent sub-district;
If the difference of the RSRP of Serving cell and adjacent sub-district is during less than first threshold, or the difference of the RSRP of Serving cell and adjacent sub-district is then given the base station with the RSRP information reporting of Serving cell that measures and adjacent sub-district during greater than second threshold value.
9. the equipment of a select target sub-district in handoff procedure is characterized in that, this equipment comprises:
Acquiring unit is used to obtain the RSRP information of current adjacent sub-district, terminal and Serving cell;
Selected cell is used for the adjacent sub-district present load information according to this terminal that obtains, and the RSRP information of said adjacent sub-district and Serving cell, is this select target sub-district, terminal.
10. equipment as claimed in claim 9; It is characterized in that; Said selected cell; Be used for there being present load surpass to set under the situation of adjacent sub-district of thresholding, according to the RSRP information that does not surpass the adjacent sub-district of setting thresholding, the adjacent sub-district of selecting downlink signal quality to meet to impose a condition is as Target cell.
11. equipment as claimed in claim 10; It is characterized in that; Said selected cell; Also be further used for not surpassing under the situation of the adjacent sub-district of setting thresholding, the load of adjacent sub-district is sorted, surpass from said present load and select the minimum adjacent sub-district of present load the adjacent sub-district of setting thresholding as Target cell in no present load.
12. equipment as claimed in claim 10 is characterized in that, said selected cell is used under the situation of the adjacent sub-district that does not exist downlink signal quality to meet to impose a condition, with the adjacent sub-district of finding certainly of the terminal to report Target cell as this terminal.
13. equipment as claimed in claim 9 is characterized in that, said acquiring unit is used in setting the storage duration, with adjacent sub-district present load information stores; The adjacent sub-district present load information of storage is carried out weighted average; The adjacent sub-district present load information that weighted average is obtained is as the adjacent sub-district present load information at terminal.
14. the equipment of a select target sub-district in handoff procedure is characterized in that, this equipment comprises:
Measuring unit is used to measure the RSRP information of Serving cell and adjacent sub-district, and the RSRP information reporting of Serving cell that measures and adjacent sub-district is carried out the selection of Target cell to the base station.
15. equipment as claimed in claim 14 is characterized in that, this equipment further comprises:
Judging unit is used to judge the difference of the RSRP of the Serving cell that measures and adjacent sub-district; In the difference of the RSRP of Serving cell and adjacent sub-district during less than first threshold, or the difference of the RSRP of Serving cell and adjacent sub-district is then given the base station with the RSRP information reporting of Serving cell that measures and adjacent sub-district during greater than second threshold value.
16. a communication system is characterized in that, comprising:
The terminal is used to measure the RSRP information of Serving cell and adjacent sub-district, and gives the base station with the RSRP information reporting of Serving cell that measures and adjacent sub-district;
The base station is used for the adjacent sub-district present load information according to this terminal that obtains, and the RSRP information of said adjacent sub-district and Serving cell, is this select target sub-district, terminal.
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| CN201110198666.9A CN102325353B (en) | 2011-07-15 | 2011-07-15 | Method, equipment and system for selecting target cell during handover |
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| CN115209490A (en) * | 2021-04-09 | 2022-10-18 | 北京小米移动软件有限公司 | Cell switching method and device, communication equipment and storage medium |
| CN115209490B (en) * | 2021-04-09 | 2024-06-04 | 北京小米移动软件有限公司 | Cell switching method and device, communication equipment and storage medium |
| CN118368681A (en) * | 2024-06-20 | 2024-07-19 | 浙江大华技术股份有限公司 | Service area selection method, terminal communication method and related devices |
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