CN103379572B - The method and apparatus for fleeing from current service cell - Google Patents
The method and apparatus for fleeing from current service cell Download PDFInfo
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- CN103379572B CN103379572B CN201310129849.4A CN201310129849A CN103379572B CN 103379572 B CN103379572 B CN 103379572B CN 201310129849 A CN201310129849 A CN 201310129849A CN 103379572 B CN103379572 B CN 103379572B
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- 238000005259 measurement Methods 0.000 claims abstract description 50
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- 238000005242 forging Methods 0.000 claims abstract description 12
- 230000001960 triggered effect Effects 0.000 claims abstract description 6
- 125000004122 cyclic group Chemical group 0.000 claims description 8
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Abstract
The invention discloses the method and apparatus of the current service cell for fleeing from wireless communication system.In the present invention, it is first determined occur needing the event for fleeing from current service cell；Then by forging measurement result and/or reducing measurement period, measurement report is quickly triggered, current service cell is gone out with Pre-handoff.It is not necessary according to the invention that network side is changed, so that it may so that UE, which is quickly fled from, for example has the current service cell that co-channel interference carries or has weak signal overlay area, so as to lift user's impression.
Description
The cross reference of related application
This application claims the priority for the 61/624th, No. 952 U.S. Provisional Application submitted on April 16th, 2012, its
Disclosure is fully incorporated in this by reference.
Technical field
The present invention relates to the communications field.More particularly it relates to flee from the method and apparatus of current service cell.
Background technology
In a wireless communication system, it is small in current service such as in TD-SCDMA (TD SDMA) system
It is very common that co-channel interference --- especially in the boundary of two cells --- occurs between area and neighbor cell.Co-channel interference can be tight
Increase the cutting off rate of user equipment (UE) in the current service cell again, reduce the success rate for being switched to neighbor cell, so that
User perceives poor.
Further, since a variety of causes, such as influenceed by building in city, the coverage of a cell is possible to
Imperfection, it may appear that weak signal overlay area.It can cause when UE is in the weak signal overlay area of the cell because signal is too weak
Demodulation performance is deteriorated so as to produce reception mistake, and then call drop occurs, so that user's perception is poor.
It is UE by during co-channel interference or UE is in weak signal overlay area to improve a kind of feasible scheme that user perceives
When, current service cell can be quickly fled from, to be switched to neighbor cell.So, how to determine co-channel interference presence or
In weak signal overlay area, just seem very crucial.How current service cell is quickly fled from simultaneously, it is adjacent to be switched to
Cell is also of equal importance.
The content of the invention
According to the first aspect of the invention, it is proposed that a kind of side for being used to flee from the current service cell of wireless communication system
Method, including：It is determined that occur needing the event for fleeing from current service cell；By forging measurement result and/or reducing measurement week
Phase, measurement report is quickly triggered, current service cell is gone out with Pre-handoff.
According to the second aspect of the invention, it is proposed that a kind of dress for being used to flee from the current service cell of wireless communication system
Put, including：Determining unit, for determining occur needing the event for fleeing from current service cell；Measurement report trigger element, is used for
By forging measurement result and/or reducing measurement period, measurement report is quickly triggered, it is small to go out current service with Pre-handoff
Area.
It is not necessary according to the invention that network side is changed, so that it may so that UE is quickly fled from for example in the presence of with frequency
Interference carries or the current service cell with weak signal overlay area, so as to lift user's impression.
Brief description of the drawings
With reference to accompanying drawing and with reference to described further below, feature, advantage and other aspects of each embodiment of the present invention will become
Must be more obvious, show some embodiments of the present invention by way of example, and not by way of limitation herein.In the accompanying drawings：
Fig. 1 schematically shows the environment that the present invention can be implemented within；
Fig. 2 shows the current service cell for being used to flee from wireless communication system according to an embodiment of the invention
Method flow chart；
Fig. 3 shows the current service cell for being used to flee from wireless communication system according to an embodiment of the invention
Device block diagram.
In all above-mentioned accompanying drawings, identical label represents there is identical, similar or corresponding feature or function.
Embodiment
The embodiments of the present invention are described in detail referring to the drawings.
Fig. 1 schematically shows the environment that the present invention can be implemented within.
As shown in figure 1, the environment 100 includes multiple cells, for simplicity, 7 cells are only marked：First community
101st, second community 102, the 3rd cell 103, the 4th cell 104, the 5th cell 105, the 6th cell 106 and seven cell
107.Wherein first community 101, second community 102, the 3rd cell 103, the 4th cell 104, the 5th cell 105, the 6th cell
106 be the neighbor cell of seven cell 107.It is assumed that before the handover, UE110 is located in seven cell 107, and UE120 is positioned at the
In one cell 101.That is, seven cell 107 is UE110 current service cell, and first community 101 is UE120
Current service cell.
Without loss of generality, in the description of the invention, base station and cell are one-to-one relations.I.e. a cell only has
One base station, and a base station only serve a cell.In addition, without loss of generality, it is false in the following description of the present invention
It is the base station in TD-SCDMA wireless communication systems to determine base station.Certainly, it will be understood to those skilled in the art that base station can also
It is the base station in WCDMA, CDMA2000, GSM, GPRS, LTE-A etc. wireless communication system.
Between each neighbor cell, more specifically, be between the corresponding base station of each neighbor cell, can be by wired
And/or wireless back haul link exchange information.
Fig. 2 shows the current service cell for being used to flee from wireless communication system according to an embodiment of the invention
Method flow chart.
Method as shown in Figure 2 can be performed by the UE110 in Fig. 1, can also be performed by the UE120 in Fig. 1.Here,
Without loss of generality, it is assumed that performed by UE110 shown in Fig. 2.
As shown in Fig. 2 this method 200 includes step S210, it is determined that occurring needing the event for fleeing from current service cell；With
And step S220, by forging measurement result and/or reducing measurement period, measurement report is quickly triggered, with Pre-handoff
Go out current service cell.
According to an embodiment of the invention, the event includes co-channel interference event, wherein when meeting following condition
When, it is determined that there is the co-channel interference event：
Received signal to noise ratio reduces；
Cyclic redundancy check (CRC) error number increases；And
Ground noise power becomes big.
In current TD-SCDMA system, using N, such as 9, frequency point networking.Wherein, each cell distributes 3 frequencies
Point.For two adjacent cells, first community 101 as stated above and seven cell 107, can be assigned identical
Frequency.Without loss of generality, it is assumed that first community 101 is assigned frequency FA, F0, F1, seven cell 107 be assigned frequency FB,
F0 and F2.That is, first community 101 and seven cell 107 are assigned identical frequency F0.If in seven cell 107
In UE110 and the UE120 in first community 101 be all assigned to identical frequency F0, and their basic midamble code
(Midamble) code number is differed, then the UE110 in the UE120 and seven cell 107 in first community 101 is formed mutually same
Frequency disturbs, particularly the situation in the two UE110 and UE120 all near the border of first community 101 and seven cell 107
Under.
UE110 is by physical layer key parameter, to determine that co-channel interference whether there is, because the presence of co-channel interference can draw
Play the deterioration of the value of physical layer key parameter.According to an embodiment of the invention, UE110 using 1) received signal to noise ratio, 2)
CRC results, 3) these physical layer parameters of ground noise power determine that co-channel interference whether there is.Under UE110 has found to meet
After row condition, determine that it receives co-channel interference, that is, determine that there occurs co-channel interference event：
(1) received signal to noise ratio reduces；
Can be by the detection to received signal to noise ratio, and help the determination with the presence or absence of co-channel interference.It is right within a period of time
Received signal to noise ratio is counted, if it find that it is less than snr threshold with some probability, or its within this period of time
Average value is less than snr threshold, then it is assumed that meeting received signal to noise ratio reduces condition.
(2) crc error increases；
Can be by the detection to crc error, and help the determination with the presence or absence of co-channel interference.To CRC within a period of time
Mistake is counted, if the number of crc error is higher than CRC error threshold, then it is assumed that meet crc error and increase condition.
(3) ground noise power becomes big；
Can be by the detection to ground noise power, and help the determination with the presence or absence of co-channel interference.Within a period of time
Ground noise power is counted, if it find that it is higher than ground noise power threshold with some probability, or in this section
Its average value in time is higher than ground noise power threshold, then it is assumed that meets ground noise power and becomes big condition.
In the case where above-mentioned 3 conditions all meet, i.e., in received signal to noise ratio reduction, crc error increases and substrate is made an uproar
In the case that acoustical power becomes big, UE110 determines co-channel interference event be present.
According to the further embodiment of the present invention, the event includes weak signal overlay area event, wherein working as satisfaction
During following condition, it is determined that there is weak signal overlay area event：
Received signal to noise ratio reduces；
Cyclic redundancy check (CRC) error number increases；And
Current service cell received signal code power RSCP is reduced.
For example, due to being influenceed in the coverage of seven cell 107 due to higher building etc. be present, UE110 can
It can undergo weak signal overlay area.
UE110 is by physical layer key parameter, to determine whether weak signal overlay area event, because weak signal is covered
The presence of cover area can cause the deterioration of the value of physical layer key parameter.According to an embodiment of the invention, UE110 is utilized
1) received signal to noise ratio, 2) CRC results, 3) these physical layer parameters of current service cell received signal code power RSCP are weak to determine
Signal coverage areas whether there is.After UE110 has found to meet following condition, determine that it undergoes weak signal overlay area, i.e., really
It is fixed that there occurs weak signal overlay area event：
(1) received signal code power RSCP in current service cell is reduced；
Can be by the measurement to current service cell RSCP, and help whether to be in the determination of weak signal overlay area.
Measurement in a period of time to current service cell RSCP counts, if it find that it is less than RSCP threshold values with some probability,
Or its average value within this period of time is less than RSCP threshold values, then it is assumed that meets the bar of current service cell RSCP reductions
Part.
(2) received signal to noise ratio reduces；
Can be by the detection to received signal to noise ratio, and help whether to be in the determination of weak signal overlay area.At one section
It is interior that received signal to noise ratio is counted, if it find that it is less than snr threshold with some probability, or in this period of time
Its interior average value is less than snr threshold, then it is assumed that meeting received signal to noise ratio reduces condition.
(3) crc error increases；
Can be by the detection to crc error, and help whether to be in the determination of weak signal overlay area.Within a period of time
Crc error is counted, if the number of crc error is higher than CRC error threshold, then it is assumed that meet crc error and increase bar
Part.
In the case where above-mentioned 3 conditions all meet, i.e., increase in received signal to noise ratio reduction, crc error and currently take
In the case that cell of being engaged in RSCP is reduced, UE110 determines weak signal overlay area event be present.
In such as TD-SCDMA system, UE must be first to network side report measurement results (such as 1g, 2a, 3a thing
Part), network side can just assign switching command to UE, and UE could start to switch over to Target cell afterwards.
For example, the difference between the RSCP when current service cell and the RSCP of a neighbor cell as Target cell
During more than a threshold value, UE just can be to network side report measurement results.
However, when UE determines to have co-channel interference event or weak signal overlay area event, report may be unsatisfactory for and surveyed
The condition of result is measured, for example, although the RSCP of current service cell decreases, but in its RSCP with all neighbor cells
The maximum (corresponding neighbor cell is generally as switching target small area) between difference, be also not greater than trigger measurement result
Report threshold value.Therefore, can not although detecting to presently, there are co-channel interference event or weak signal overlay area event
Switched out from current service cell.
Therefore, according to the present invention, as described above, by forging measurement result and/or reducing measurement period, so as to
The report of measurement result is quickly triggered, current service cell is gone out with Pre-handoff.
Forging measurement result includes reducing the actual RSCP measured values of current service cell or raises the reality of neighbor cell
RSCP measured values, reduce the RSCP measurement periods that measurement period includes reducing current service cell and neighbor cell.
By the actual RSCP measured values or the rise neighbor cell (target more specifically switched that reduce current service cell
Cell) actual RSCP measured values, enabling meet the condition of report measurement results in advance.
And reduce the RSCP measurement periods of current service cell and neighbor cell, enabling quickly obtain current service
Cell and the RSCP measurement results of neighbor cell, it helps the RSCP of current service cell and the RSCP of neighbor cell difference
Quickly it is more than a threshold value, so as to quickly meet the condition of report measurement results.
According to an embodiment of the invention, in the case where UE110 is determined to be co-channel interference, the target of switching
Cell can be that neighbor cell 101 or its RSCP for causing co-channel interference occur in current service cell 107 adjacent
It is that maximum neighbor cell in cell.It will be understood to those skilled in the art that cause to occur in current service cell 107
That neighbor cell 101 and its RSCP of co-channel interference are that maximum neighbor cell is probably same in neighbor cell
Cell.
According to an embodiment of the invention, in the case where UE110 is determined to be weak signal overlay area, switching
Target cell be that its RSCP is that maximum neighbor cell in neighbor cell.
According to an embodiment of the invention, as shown in phantom in Figure 2, method 200 also includes step S230, from net
Network side joint receive switching command, so as to complete the switching from current service cell to Target cell, and step S240, complete from
Current service cell sends the response that switching completes to after the switching of Target cell, to network side.
In network side, such as the base station of current service cell 107, after reported measurement result is received from UE110, such as
Fruit disclosure satisfy that switching requires, then a switching command will be sent to UE110, so that UE110 completions are small from current service
Switching of the area to Target cell.
After the switching that UE110 completes from current service cell to Target cell, it can be to network side, such as Target cell
Base station, send one switching complete response.
In description as above, it is assumed that base station repeats measurement results of the UE110 to its current service cell 107.
In addition, it will be appreciated that shown in dotted line, step S230 and step S240 can not necessarily occur, if for example,
Network side finds to meet that switching requires, such as Target cell is crowded etc., then will not send and switch to UE110
Order, response is completed so as to which UE110 also will not send switching to network side.
It is not necessary according to the invention that network side is changed, so that it may so that UE is quickly fled from for example in the presence of with frequency
Interference carries or the current service cell with weak signal overlay area, so as to lift user's impression.
Fig. 3 shows the current service cell for being used to flee from wireless communication system according to an embodiment of the invention
Device block diagram.
As shown in figure 3, described device 300 includes：Determining unit 310 is small for determining to occur needing to flee from current service
The event in area；Measurement report trigger element 320, for by forging measurement result and/or reducing measurement period, quickly touching
Measurement report is sent out, current service cell is gone out with Pre-handoff.
According to an embodiment of the invention, the event includes co-channel interference event, wherein when meeting following condition
When, determining unit 310 determines the co-channel interference event occur：
Received signal to noise ratio reduces；
Cyclic redundancy check (CRC) error number increases；
Ground noise power becomes big.
According to the further embodiment of the present invention, the event includes weak signal overlay area event, wherein working as satisfaction
During following condition, determining unit 310 determines weak signal overlay area event occur：
Received signal to noise ratio reduces；
Cyclic redundancy check (CRC) error number increases；
Current service cell received signal code power RSCP is reduced.
According to an embodiment of the invention, forging measurement result includes reducing the actual RSCP surveys of current service cell
Value or the actual RSCP measured values for raising neighbor cell, reducing measurement period includes reducing current service cell and neighbor cell
RSCP measurement periods.
According to an embodiment of the invention, when the event is co-channel interference event, the Target cell of switching is
That neighbor cell or its RSCP for causing co-channel interference occur in current service cell are maximum that in neighbor cell
Individual neighbor cell.
According to an embodiment of the invention, when the event is weak signal overlay area event, the target of switching
Cell is that its RSCP is that maximum neighbor cell in neighbor cell.
According to an embodiment of the invention, device 300 also includes：Receiving unit 330, cut for being received from network side
Order is changed, so as to complete the switching from current service cell to Target cell.
According to an embodiment of the invention, device 300 also includes：Transmitting element 340, for completing from current clothes
Be engaged in cell arrive the switching of Target cell after, to network side send switching completion response.
According to an embodiment of the invention, the wireless communication system is TD SDMA TD-SCDMA systems
System.
According to an embodiment of the invention, described device 300 is included in user equipment (UE) 110 or UE120.
It should be noted that in order that the present invention is easier to understand, above description is eliminated for those skilled in the art
For be known and more specifically some ins and outs for being likely necessary of realization for the present invention.
Therefore, it is to preferably explain the principle and its practical application of the present invention, and make to select and describe embodiment
Those of ordinary skill in the art understand, on the premise of essence of the present invention is not departed from, all modifications and change are each fallen within by right
It is required that within the protection scope of the present invention limited.
Claims (18)
1. a kind of method for being used to flee from the current service cell of wireless communication system, including：
It is determined that occur needing the event for fleeing from current service cell；
By forging measurement result and/or reducing measurement period, measurement report is quickly triggered, current clothes are gone out with Pre-handoff
Business cell,
Wherein forging measurement result includes reducing the actual RSCP measured values of current service cell or raises the reality of neighbor cell
RSCP measured values, reduce the RSCP measurement periods that measurement period includes reducing current service cell and neighbor cell.
2. according to the method for claim 1, wherein the event package includes co-channel interference event, wherein when meeting following condition
When, it is determined that there is the co-channel interference event：
Received signal to noise ratio reduces；
Cyclic redundancy check (CRC) error number increases；And
Ground noise power becomes big.
3. according to the method for claim 1, wherein the event package includes weak signal overlay area event, wherein when meeting such as
During lower condition, it is determined that there is weak signal overlay area event：
Received signal to noise ratio reduces；
Cyclic redundancy check (CRC) error number increases；
Current service cell received signal code power RSCP is reduced.
4. according to the method for claim 2, wherein the Target cell switched is to cause to occur with frequency in current service cell
That neighbor cell or its RSCP of interference are that maximum neighbor cell in neighbor cell.
5. according to the method for claim 3, wherein it is maximum in neighbor cell that the Target cell switched, which is its RSCP,
That neighbor cell.
6. the method according to claim 11, in addition to：
Switching command is received from network side, so as to complete the switching from current service cell to Target cell.
7. the method according to claim 11, in addition to：
After the switching from current service cell to Target cell is completed, the response of switching completion is sent to network side.
8. according to the method for claim 1, wherein the wireless communication system is TD SDMA TD-SCDMA
System.
9. according to the method any one of claim 1-8, wherein performing each step of method by user equipment.
10. a kind of device for being used to flee from the current service cell of wireless communication system, including：
Determining unit, for determining occur needing the event for fleeing from current service cell；
Measurement report trigger element, for by forging measurement result and/or reducing measurement period, quickly triggering measurement to be reported
Accuse, current service cell gone out with Pre-handoff,
Wherein forging measurement result includes reducing the actual RSCP measured values of current service cell or raises the reality of neighbor cell
RSCP measured values, reduce the RSCP measurement periods that measurement period includes reducing current service cell and neighbor cell.
11. device according to claim 10, wherein the event package includes co-channel interference event, wherein when meeting following bar
During part, determining unit determines the co-channel interference event occur：
Received signal to noise ratio reduces；
Cyclic redundancy check (CRC) error number increases；
Ground noise power becomes big.
12. device according to claim 10, wherein the event package includes weak signal overlay area event, wherein working as satisfaction
During following condition, determining unit determines weak signal overlay area event occur：
Received signal to noise ratio reduces；
Cyclic redundancy check (CRC) error number increases；
Current service cell received signal code power RSCP is reduced.
13. device according to claim 11, wherein the Target cell switched is to cause to occur together in current service cell
That neighbor cell of frequency interference or its RSCP are that maximum neighbor cell in neighbor cell.
14. device according to claim 12, wherein it is maximum in neighbor cell that the Target cell switched, which is its RSCP,
That neighbor cell.
15. device according to claim 10, in addition to：
Receiving unit, for receiving switching command from network side, so as to complete the switching from current service cell to Target cell.
16. device according to claim 15, in addition to：
Transmitting element, for after the switching from current service cell to Target cell is completed, sending switching to network side and completing
Response.
17. device according to claim 10, wherein the wireless communication system is TD SDMA TD-
SCDMA systems.
18. according to the device any one of claim 10-17, wherein described device is included in a user device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| US201261624952P | 2012-04-16 | 2012-04-16 | |
| US61/624,952 | 2012-04-16 |
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| CN103379572B true CN103379572B (en) | 2018-02-09 |
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| CN107182093B (en) * | 2016-03-09 | 2020-11-17 | 华为技术有限公司 | Network migration method and device |
| CN106792556A (en) * | 2016-12-08 | 2017-05-31 | 武汉虹信通信技术有限责任公司 | Serving cell switching handling method under a kind of track traffic scene |
| CN106714249B (en) * | 2016-12-19 | 2020-08-04 | 深圳市万普拉斯科技有限公司 | Network switching method and device and mobile terminal |
| WO2020077517A1 (en) | 2018-10-16 | 2020-04-23 | 华为技术有限公司 | Cell switching method and device under high-speed mobile context |
| WO2021204212A1 (en) * | 2020-04-07 | 2021-10-14 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and user equipment for adjusting cell measurement |
| CN113115391B (en) * | 2021-05-25 | 2023-07-21 | Oppo广东移动通信有限公司 | Cell measurement method and device, equipment, storage medium |
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| CN1152991A (en) * | 1994-05-19 | 1997-06-25 | 依塔尔泰尔公司 | Method and apparatus for rapid handover in a mobile radio system in the presence of abrupt radio signal attenuation |
| WO2008116028A1 (en) * | 2007-03-19 | 2008-09-25 | Qualcomm Incorporated | Channel dependent credit accumulation for mobile handover |
| CN101965024A (en) * | 2009-07-21 | 2011-02-02 | 中兴通讯股份有限公司 | Report set measurement and trigger measurement report based method, system and user terminal (UE) |
| CN102104926A (en) * | 2009-12-18 | 2011-06-22 | 华为技术有限公司 | Switching trigger method and device |
| CN102378192A (en) * | 2010-08-17 | 2012-03-14 | 中兴通讯股份有限公司 | Co-existing interference avoiding method and device |
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|---|---|---|---|---|
| CN1152991A (en) * | 1994-05-19 | 1997-06-25 | 依塔尔泰尔公司 | Method and apparatus for rapid handover in a mobile radio system in the presence of abrupt radio signal attenuation |
| WO2008116028A1 (en) * | 2007-03-19 | 2008-09-25 | Qualcomm Incorporated | Channel dependent credit accumulation for mobile handover |
| CN101965024A (en) * | 2009-07-21 | 2011-02-02 | 中兴通讯股份有限公司 | Report set measurement and trigger measurement report based method, system and user terminal (UE) |
| CN102104926A (en) * | 2009-12-18 | 2011-06-22 | 华为技术有限公司 | Switching trigger method and device |
| CN102378192A (en) * | 2010-08-17 | 2012-03-14 | 中兴通讯股份有限公司 | Co-existing interference avoiding method and device |
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