CN103379572A - Method and device for escaping from current serving cell - Google Patents
Method and device for escaping from current serving cell Download PDFInfo
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- CN103379572A CN103379572A CN2013101298494A CN201310129849A CN103379572A CN 103379572 A CN103379572 A CN 103379572A CN 2013101298494 A CN2013101298494 A CN 2013101298494A CN 201310129849 A CN201310129849 A CN 201310129849A CN 103379572 A CN103379572 A CN 103379572A
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Abstract
The invention discloses a method and a device for escaping from a current serving cell. According to the invention, firstly, an event which needs to escape from the current serving cell is determined. Secondly, a measurement report is triggered more quickly through counterfeiting the measuring result and/or lowering the measuring period, so as to switch out of the current serving cell in advance. According to the invention, no modification needs to be carried out on a network side, while user's equipment (UE) can escape from the current serving cell more quickly, wherein the current serving cell has the defects of co-channel interference or poor signal intensity. Therefore, the user experience is improved.
Description
The cross reference of related application
The application requires the priority of the 61/624th, No. 952 U.S. Provisional Application submitting on April 16th, 2012, and its disclosure mode by reference all is incorporated into this.
Technical field
The present invention relates to the communications field.More specifically, the present invention relates to flee from the method and apparatus of current service cell.
Background technology
The boundary of two residential quarters---especially---is very common in wireless communication system, for example in TD-SCDMA (TD SDMA) system, co-channel interference to occur between current service cell and neighbor cell.Co-channel interference can seriously increase the cutting off rate of user equipment (UE) in this current Serving cell, reduce the success rate that switches to neighbor cell, thereby so that user awareness is relatively poor.
In addition, because a variety of causes for example is subject to influence of building in the city, the weak signal overlay area can appear in the possible imperfection of the coverage of a residential quarter.Can receive mistake because thereby signal causes the demodulation performance variation to produce a little less than too when UE is in the weak signal overlay area of this residential quarter, and then call drop occurs, thereby so that user awareness is relatively poor.
A kind of feasible scheme that improves user awareness is UE when being subject to co-channel interference or UE when being in the weak signal overlay area, can flee from quickly current service cell, to switch to neighbor cell.So, the existence of how to confirm co-channel interference or be in the weak signal overlay area just seems very crucial.Simultaneously how to flee from quickly current service cell, also of equal importance to switch to neighbor cell.
Summary of the invention
According to a first aspect of the invention, proposed a kind of method of the current service cell be used to fleeing from wireless communication system, having comprised: determined that appearance need to flee from the event of current service cell; By forging measurement result and/or reducing measuring period, trigger quickly measurement report, go out current service cell with Pre-handoff.
According to a second aspect of the invention, proposed a kind of device of the current service cell be used to fleeing from wireless communication system, having comprised: determining unit is used for the event that definite appearance need to be fled from current service cell; The measurement report trigger element is used for triggering quickly measurement report by forging measurement result and/or reducing measuring period, goes out current service cell with Pre-handoff.
According to the present invention, do not need network side is changed, UE is fled from quickly for example exist co-channel interference to carry or have the current service cell of weak signal overlay area, thereby can promote user's impression.
Description of drawings
Also with reference to following detailed description, the feature of each execution mode of the present invention, advantage and other aspects will become more obvious, show some execution modes of the present invention at this in exemplary and nonrestrictive mode by reference to the accompanying drawings.In the accompanying drawings:
Fig. 1 schematically shows the environment that the present invention can implement therein;
Fig. 2 shows the flow chart of method of current service cell that is used for fleeing from wireless communication system according to an embodiment of the invention;
Fig. 3 shows the block diagram of device of current service cell that is used for fleeing from wireless communication system according to an embodiment of the invention.
In all above-mentioned accompanying drawings, identical label represents to have identical, similar or corresponding feature or function.
Embodiment
Describe the embodiments of the present invention in detail referring to accompanying drawing.
Fig. 1 schematically shows the environment that the present invention can implement therein.
As shown in Figure 1, this environment 100 comprises a plurality of residential quarters, for simplicity, a mark 7 residential quarters: the first residential quarter 101, the second residential quarter 102, the 3rd residential quarter 103, the 4th residential quarter 104, the 5th residential quarter 105, the 6th residential quarter 106 and seven cell 107.Wherein the first residential quarter 101, the second residential quarter 102, the 3rd residential quarter 103, the 4th residential quarter 104, the 5th residential quarter 105, the 6th residential quarter 106 are neighbor cells of seven cell 107.Suppose that before switching, UE110 is arranged in seven cell 107, and UE120 is arranged in the first residential quarter 101.That is to say that seven cell 107 is current service cell of UE110, and the first residential quarter 101 is current service cell of UE120.
Be without loss of generality, in description of the invention, base station and residential quarter are to concern one to one.Namely a residential quarter only has a base station, and a residential quarter is only served in a base station.In addition, be without loss of generality, in the following description of the present invention, suppose that the base station is the base station in the TD-SCDMA wireless communication system.Certainly, those skilled in the art will appreciate that the base station also can be the base station in WCDMA, CDMA2000, GSM, GPRS, LTE-A etc. the wireless communication system.
Between each neighbor cell, more particularly, be between the corresponding base station of each neighbor cell, can be by wired and/or wireless back haul link exchange message.
Fig. 2 shows the flow chart of method of current service cell that is used for fleeing from wireless communication system according to an embodiment of the invention.
Method as shown in Figure 2 can be carried out by the UE110 among Fig. 1, also can be carried out by the UE120 among Fig. 1.Here, be without loss of generality, suppose to be come shown in the execution graph 2 by UE110.
As shown in Figure 2, the method 200 comprises step S210, determines that appearance need to flee from the event of current service cell; And step S220, by forging measurement result and/or reducing measuring period, trigger quickly measurement report, go out current service cell with Pre-handoff.
According to an embodiment of the invention, described event comprises the co-channel interference event, wherein when satisfying following condition, determines to occur described co-channel interference event:
Received signal to noise ratio reduces;
The cyclic redundancy check (CRC) error number increases; And
It is large that ground noise power becomes.
In current TD-SCDMA system, adopt N, for example 9, frequency point networking.Wherein, 3 frequencies of each cell allocation.For two adjacent residential quarters, for example the first residential quarter 101 and seven cell 107 recited above can be assigned with identical frequency.Be without loss of generality, suppose that the first residential quarter 101 is assigned frequency FA, F0, F1, seven cell 107 is assigned frequency FB, F0 and F2.That is to say that the first residential quarter 101 is assigned identical frequency F0 with seven cell 107.If the UE110 in seven cell 107 is assigned to identical frequency F0 with UE120 in the first residential quarter 101, and their basic midamble code (Midamble) code is number not identical, then the UE120 in the first residential quarter 101 and the UE110 in the seven cell 107 consist of mutually co-channel interference, particularly at these two UE110 and UE120 all in the situation at the boundary vicinity of the first residential quarter 101 and seven cell 107.
UE110 determines whether co-channel interference exists, because the existence of co-channel interference can cause the deterioration of the value of physical layer key parameter by the physical layer key parameter.According to an embodiment of the invention, UE110 utilizes 1) received signal to noise ratio, 2) CRC result, 3) these physical layer parameters of ground noise power determine whether co-channel interference exists.After UE110 finds to satisfy following condition, determine that it has been subject to co-channel interference, namely determine to have occured the co-channel interference event:
(1) received signal to noise ratio reduces;
Can pass through the detection to received signal to noise ratio, and help whether to exist determining of co-channel interference.Within a period of time, received signal to noise ratio is added up, be lower than snr threshold if find it with certain probability, perhaps be lower than snr threshold at this section its mean value in the time, think that then having satisfied received signal to noise ratio reduces condition.
(2) crc error increases;
Can pass through the detection to crc error, and help whether to exist determining of co-channel interference.Within a period of time, crc error is added up, if the number of crc error is higher than the crc error threshold value, thought that then having satisfied crc error increases condition.
(3) ground noise power becomes large;
Can pass through the detection to ground noise power, and help whether to exist determining of co-channel interference.Within a period of time, ground noise power is added up, be higher than the ground noise power threshold if find it with certain probability, perhaps be higher than the ground noise power threshold at this section its mean value in the time, think that then having satisfied ground noise power becomes large condition.
In the situation that above-mentioned 3 conditions all satisfy, namely in the situation that received signal to noise ratio reduces, crc error increases and the change of ground noise power is large, UE110 determines to exist the co-channel interference event.
According to another execution mode of the present invention, described event comprises weak signal overlay area event, wherein when satisfying following condition, determines to occur described weak signal overlay area event:
Received signal to noise ratio reduces;
The cyclic redundancy check (CRC) error number increases; And
Current service cell received signal code power RSCP reduces.
For example since in the coverage of seven cell 107 owing to there are the higher impacts such as building, UE110 may experience the weak signal overlay area.
UE110 determines whether to occur weak signal overlay area event, because the existence of weak signal overlay area can cause the deterioration of the value of physical layer key parameter by the physical layer key parameter.According to an embodiment of the invention, UE110 utilizes 1) received signal to noise ratio, 2) CRC result, 3) these physical layer parameters of current service cell received signal code power RSCP determine whether the weak signal overlay area exists.After UE110 finds to satisfy following condition, determine its experience weak signal overlay area, namely determine to have occured weak signal overlay area event:
(1) current service cell received signal code power RSCP reduces;
Can pass through the measurement to current service cell RSCP, and help whether to be in determining of weak signal overlay area.Within a period of time, the measurement of current service cell RSCP is added up, be lower than the RSCP threshold value if find it with certain probability, perhaps be lower than the RSCP threshold value at this section its mean value in the time, then think and satisfied the condition that current service cell RSCP reduces.
(2) received signal to noise ratio reduces;
Can pass through the detection to received signal to noise ratio, and help whether to be in determining of weak signal overlay area.Within a period of time, received signal to noise ratio is added up, be lower than snr threshold if find it with certain probability, perhaps be lower than snr threshold at this section its mean value in the time, think that then having satisfied received signal to noise ratio reduces condition.
(3) crc error increases;
Can pass through the detection to crc error, and help whether to be in determining of weak signal overlay area.Within a period of time, crc error is added up, if the number of crc error is higher than the crc error threshold value, thought that then having satisfied crc error increases condition.
In the situation that above-mentioned 3 conditions all satisfy, namely in the situation that received signal to noise ratio reduces, crc error increases and current service cell RSCP reduces, UE110 determines to exist weak signal overlay area event.
In TD-SCDMA system for example, UE must be at first to network side report measurement result (such as events such as 1g, 2a, 3a), and network side just can be assigned switching command to UE, and UE could begin to switch to Target cell afterwards.
For example, as the RSCP of current service cell and as the difference between the RSCP of a neighbor cell of Target cell during greater than a threshold value, UE just can report measurement result to network side.
Yet, when UE determines to exist co-channel interference event or weak signal overlay area event, may not satisfy the condition of report measurement result, for example, although the RSCP of current service cell decreases, but its with the RSCP of all neighbor cells in the maximum (corresponding neighbor cell is generally as switching target small area) between difference, also not greater than the threshold value of the report that triggers measurement result.Therefore, there are at present co-channel interference event or weak signal overlay area event although detect, can not switch away from current service cell.
Therefore, according to the present invention, as mentioned above, by forging measurement result and/or reduce measuring period, thereby can trigger quickly the report of measurement result, go out current service cell with Pre-handoff.
Forge measurement result and comprise the actual RSCP measured value that reduces current service cell or the actual RSCP measured value of rising neighbor cell, reduce the RSCP measuring period that comprises reduction current service cell and neighbor cell measuring period.
By the actual RSCP measured value of reduction current service cell or the actual RSCP measured value of rising neighbor cell (Target cell that more specifically switches), make it possible to satisfy in advance the condition of report measurement result.
And the RSCP measuring period of reducing current service cell and neighbor cell, make it possible to obtain quickly the RSCP measurement result of current service cell and neighbor cell, also help the difference of RSCP of the RSCP of current service cell and neighbor cell quickly greater than a threshold value, thereby satisfy quickly the condition of report measurement result.
According to an embodiment of the invention, be determined to be at UE110 in the situation of co-channel interference, the Target cell of switching can be to cause that neighbor cell 101 of co-channel interference occurring or its RSCP is that maximum neighbor cell in current service cell 107 in neighbor cell.Those skilled in the art will appreciate that that neighbor cell 101 of causing co-channel interference occurring in current service cell 107 and its RSCP are that maximum neighbor cell may be same residential quarter in neighbor cell.
According to an embodiment of the invention, be determined to be at UE110 in the situation of weak signal overlay area, the Target cell of switching is 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 comprises step S230, receive switching command from network side, thereby finish the switching from the current service cell to the Target cell, and step S240, after the switching of finishing from the current service cell to the Target cell, send the response that switching is finished to network side.
At network side, the base station of current service cell 107 for example, receive the measurement result of reporting from UE110 after, if can satisfy the switching requirement, will send a switching command to UE110 so, so that UE110 finishes the switching from the current service cell to the Target cell.
After UE110 finished switching from the current service cell to the Target cell, it can be to network side, and for example the base station of Target cell sends the response that switching is finished.
In description as above, suppose that UE110 is to the base station report measurement result of its current service cell 107.
In addition, be to be understood that, shown in dotted line, step S230 and step S240 are bound to occur, for example, if network side find to satisfy the switching requirement, crowded etc. such as Target cell, to can not send switching command to UE110 so, finish response thereby UE110 also can not send switching to network side.
According to the present invention, do not need network side is changed, UE is fled from quickly for example exist co-channel interference to carry or have the current service cell of weak signal overlay area, thereby can promote user's impression.
Fig. 3 shows the block diagram of device of current service cell that is used for fleeing from wireless communication system according to an embodiment of the invention.
As shown in Figure 3, described device 300 comprises: determining unit 310 is used for the event that definite appearance need to be fled from current service cell; Measurement report trigger element 320 is used for triggering quickly measurement report by forging measurement result and/or reducing measuring period, goes out current service cell with Pre-handoff.
According to an embodiment of the invention, described event comprises the co-channel interference event, and wherein when satisfying following condition, determining unit 310 determines to occur described co-channel interference event:
Received signal to noise ratio reduces;
The cyclic redundancy check (CRC) error number increases;
It is large that ground noise power becomes.
According to another execution mode of the present invention, described event comprises weak signal overlay area event, and wherein when satisfying following condition, determining unit 310 determines to occur described weak signal overlay area event:
Received signal to noise ratio reduces;
The cyclic redundancy check (CRC) error number increases;
Current service cell received signal code power RSCP reduces.
According to an embodiment of the invention, forge measurement result and comprise the actual RSCP measured value that reduces current service cell or the actual RSCP measured value of rising neighbor cell, reduce the RSCP measuring period that comprises reduction current service cell and neighbor cell measuring period.
According to an embodiment of the invention, when described event was the co-channel interference event, the Target cell of switching was to cause that neighbor cell of co-channel interference occurring or its RSCP is that maximum neighbor cell in current service cell in neighbor cell.
According to an embodiment of the invention, when described event was weak signal overlay area event, the Target cell of switching was that its RSCP is that maximum neighbor cell in neighbor cell.
According to an embodiment of the invention, device 300 also comprises: receiving element 330 is used for receiving switching command from network side, thereby finishes the switching from the current service cell to the Target cell.
According to an embodiment of the invention, device 300 also comprises: transmitting element 340, be used for after the switching of finishing from the current service cell to the Target cell, and send to network side and switch the response of finishing.
According to an embodiment of the invention, described wireless communication system is TD SDMA TD-SCDMA system.
According to an embodiment of the invention, described device 300 is included among user equipment (UE) 110 or the UE120.
Should be noted that for the present invention is more readily understood top description has been omitted to be known for a person skilled in the art and may to be essential more specifically some ins and outs for realization of the present invention.
Therefore; selecting and describing execution mode is in order to explain better principle of the present invention and practical application thereof; and those of ordinary skills are understood, under the prerequisite that does not break away from essence of the present invention, all modifications and change all fall within protection scope of the present invention defined by the claims.
Claims (20)
1. method that is used for fleeing from the current service cell of wireless communication system comprises:
Definite appearance need to be fled from the event of current service cell;
By forging measurement result and/or reducing measuring period, trigger quickly measurement report, go out current service cell with Pre-handoff.
2. method according to claim 1, wherein said event comprises the co-channel interference event, wherein when satisfying following condition, determines to occur described co-channel interference event:
Received signal to noise ratio reduces;
The cyclic redundancy check (CRC) error number increases; And
It is large that ground noise power becomes.
3. method according to claim 1, wherein said event comprises weak signal overlay area event, wherein when satisfying following condition, determines to occur described weak signal overlay area event:
Received signal to noise ratio reduces;
The cyclic redundancy check (CRC) error number increases;
Current service cell received signal code power RSCP reduces.
4. method according to claim 1, wherein forge measurement result and comprise the actual RSCP measured value that reduces current service cell or the actual RSCP measured value of rising neighbor cell, reduce and comprise the RSCP measuring period of reducing current service cell and neighbor cell measuring period.
5. method according to claim 2, the Target cell that wherein switches are that neighbor cell or its RSCP that cause occurring in current service cell co-channel interference are that maximum neighbor cell in neighbor cell.
6. method according to claim 3, the Target cell that wherein switches are that its RSCP is that maximum neighbor cell in neighbor cell.
7. method according to claim 1 also comprises:
Receive switching command from network side, thereby finish the switching from the current service cell to the Target cell.
8. method according to claim 7 also comprises:
After the switching of finishing from the current service cell to the Target cell, send the response that switching is finished to network side.
9. method according to claim 1, wherein said wireless communication system is TD SDMA TD-SCDMA system.
10. each described method according to claim 1-9 is wherein come each step of manner of execution by subscriber equipment.
11. the device for the current service cell of fleeing from wireless communication system comprises:
Determining unit is used for the event that definite appearance need to be fled from current service cell;
The measurement report trigger element is used for triggering quickly measurement report by forging measurement result and/or reducing measuring period, goes out current service cell with Pre-handoff.
12. device according to claim 11, wherein said event comprises the co-channel interference event, and wherein when satisfying following condition, determining unit determines to occur described co-channel interference event:
Received signal to noise ratio reduces;
The cyclic redundancy check (CRC) error number increases;
It is large that ground noise power becomes.
13. device according to claim 11, wherein said event comprise weak signal overlay area event, wherein when satisfying following condition, determining unit determines to occur described weak signal overlay area event:
Received signal to noise ratio reduces;
The cyclic redundancy check (CRC) error number increases;
Current service cell received signal code power RSCP reduces.
14. device according to claim 11, wherein forge measurement result and comprise the actual RSCP measured value that reduces current service cell or the actual RSCP measured value of rising neighbor cell, reduce and comprise the RSCP measuring period of reducing current service cell and neighbor cell measuring period.
15. device according to claim 12, the Target cell that wherein switches are that neighbor cell or its RSCP that cause occurring in current service cell co-channel interference are that maximum neighbor cell in neighbor cell.
16. device according to claim 13, the Target cell that wherein switches are its RSCP is that maximum neighbor cell in neighbor cell.
17. device according to claim 11 also comprises:
Receiving element is used for receiving switching command from network side, thereby finishes the switching from the current service cell to the Target cell.
18. device according to claim 17 also comprises:
Transmitting element is used for after the switching of finishing from the current service cell to the Target cell, sends to network side and switches the response of finishing.
19. device according to claim 11, wherein said wireless communication system are TD SDMA TD-SCDMA systems.
20. each described device according to claim 11-19, wherein said device is included in the subscriber equipment.
Applications Claiming Priority (2)
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| US201261624952P | 2012-04-16 | 2012-04-16 | |
| US61/624,952 | 2012-04-16 |
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| CN103379572B CN103379572B (en) | 2018-02-09 |
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| CN106714249A (en) * | 2016-12-19 | 2017-05-24 | 深圳市万普拉斯科技有限公司 | Network switching method, apparatus and mobile terminal thereof |
| 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 |
| CN107182093A (en) * | 2016-03-09 | 2017-09-19 | 华为技术有限公司 | Network migration method and device |
| CN111567091A (en) * | 2018-10-16 | 2020-08-21 | 华为技术有限公司 | Cell switching method and device under high-speed mobile scene |
| WO2021204212A1 (en) * | 2020-04-07 | 2021-10-14 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and user equipment for adjusting cell measurement |
| WO2022247532A1 (en) * | 2021-05-25 | 2022-12-01 | Oppo广东移动通信有限公司 | Cell measurement method and apparatus, equipment, and storage medium |
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| WO2021204212A1 (en) * | 2020-04-07 | 2021-10-14 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and user equipment for adjusting cell measurement |
| WO2022247532A1 (en) * | 2021-05-25 | 2022-12-01 | Oppo广东移动通信有限公司 | Cell measurement method and apparatus, equipment, and storage medium |
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| CN103379572B (en) | 2018-02-09 |
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Effective date of registration: 20200424 Address after: Singapore City Patentee after: Marvell Asia Pte. Ltd. Address before: Ford street, Grand Cayman, Cayman Islands Patentee before: Kaiwei international Co. Effective date of registration: 20200424 Address after: Ford street, Grand Cayman, Cayman Islands Patentee after: Kaiwei international Co. Address before: Hamilton, Bermuda Patentee before: Marvell International Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180209 Termination date: 20200409 |