CN101166044B - Downlink power control method and device for switching - Google Patents
Downlink power control method and device for switching Download PDFInfo
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- CN101166044B CN101166044B CN2006101370618A CN200610137061A CN101166044B CN 101166044 B CN101166044 B CN 101166044B CN 2006101370618 A CN2006101370618 A CN 2006101370618A CN 200610137061 A CN200610137061 A CN 200610137061A CN 101166044 B CN101166044 B CN 101166044B
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Abstract
This invention discloses a down-power control method and a device used in switching, in which, the method includes the following steps: 1, when it's necessary for a UE to be switched to a target area from an original area, a radio network controller computes path loss between them, 2, the controller maps the loss onto a down-power control list to get corresponding initial emission power, 3, the controller emits a switch order containing the initial emission power information to the target area.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of method for controlling downlink power that is used to switch and device.
Background technology
At TD SDMA (Time Division Synchronization Code-Division Multiple Access, abbreviation TD-SCDMA) in the handoff procedure of system, as subscriber equipment (User Equipment, be called for short UE) when the cell-of-origin switches to Target cell, the down initial transmitting power of Target cell is difficult to determine, especially in handoff procedure, UE receives only the Target cell downstream signal at first, Target cell can't be determined its Initial Trans, in this case, if Target cell covers power with maximum and sends, can cause interference to other UE and other sub-districts, secondly, also can influence the power of Target cell with other down channels in the time slot.
Concrete, in the handoff procedure of TD-SCDMA system, when UE switches when Target cell switches from the cell-of-origin, radio network controller (Radio NetworkController, be called for short RNC) according to signal interference ratio (the Signal InterferenceRatio of UE, abbreviation SIR) value judges whether UE needs to carry out handover measurement, when sir value satisfies measuring condition, UE measures according to RNC instruction and measurement result is reported RNC, RNC judges whether reported result satisfies switching condition, if satisfy, then initiates the physical channel reprovision, guiding UE switches to Target cell, and its flow process as shown in Figure 1.
Have some problems in the open Loop Power control flow process of Fig. 1, promptly when RNC initiation physical channel reprovision, and the notification target sub-district should send with great down transmitting power when UE sends information.If Target cell covers power with maximum and sends, can cause interference to other UE and other sub-districts, secondly, also can influence the power of Target cell with other down channels in the time slot.If the Target cell transmitting power is too small, UE possibly can't correctly receive, and causes handoff failure.
Summary of the invention
The present invention is intended to solve above-mentioned one or more problem, has proposed a kind of system switching method and device.
According to an aspect of the present invention, a kind of method for controlling downlink power that is used to switch has been proposed.This method may further comprise the steps: S2042, need switch to from the cell-of-origin under the situation of Target cell at subscriber equipment, and radio network controller calculates the path loss between subscriber equipment and the Target cell; S2044, radio network controller is mapped to path loss in the descending power control table, obtains corresponding Initial Trans; S2046, radio network controller send the switching command that comprises Initial Trans information to Target cell.
In above-mentioned method for controlling downlink power, radio network controller is according to handover measurement and the actual emission power calculating subscriber equipment of Target cell and the path loss between the Target cell of user equipment to report.
In above-mentioned method for controlling downlink power, the descending power control table comprises: with respect to the down transmitting power offset information of Primary Common Control Physical Channel and the described path loss information of radio network controller calculating.
In above-mentioned method for controlling downlink power, the descending power control table further comprises signal interference ratio constraints.
According to a further aspect in the invention, provide a kind of descending power control device that is used to switch.This device comprises: path loss computing module 5042, be positioned at the radio network controller side, and be used for need switching to from the cell-of-origin under the situation of Target cell at subscriber equipment, calculate the path loss between subscriber equipment and the Target cell; Power acquisition module 5044 is positioned at the radio network controller side, is used for path loss is mapped to the descending power control table, obtains corresponding Initial Trans; Switching command sending module 5046 is positioned at the radio network controller side, is used for sending the switching command that comprises Initial Trans information to Target cell.
In above-mentioned descending power control device, the path loss computing module is according to handover measurement and the actual emission power calculating subscriber equipment of Target cell and the path loss between the Target cell of user equipment to report.
In above-mentioned descending power control device, the descending power control table comprises: with respect to the down transmitting power offset information of Primary Common Control Physical Channel and the described path loss information of radio network controller calculating.
In above-mentioned descending power control device, the descending power control table further comprises signal interference ratio constraints.
By the present invention, can make Target cell send information to subscriber equipment with suitable power, thereby can guarantee that subscriber equipment correctly receives information, can not cause too much influence again to other subscriber equipmenies and other sub-districts, simultaneously, can not cause too big influence with the power of other channels in the time slot to Target cell yet.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram that the TD-SCDMA switching flow in the correlation technique is shown;
Fig. 2 is the flow chart that illustrates according to system switching method of the present invention;
Fig. 3 a is the particular flow sheet that illustrates according to the step S202 of system switching method of the present invention;
Fig. 3 b is the particular flow sheet that illustrates according to the step S204 of system switching method of the present invention;
Fig. 4 illustrates the schematic diagram according to TD-SCDMA of the present invention system switching flow; And
Fig. 5 is the block diagram that illustrates according to system of the present invention switching device shifter.
Embodiment
Below with reference to accompanying drawing, describe specific embodiments of the invention in detail.
In the method for controlling downlink power in the system switching method that the present invention proposes, the measurement result that RNC reports according to UE, calculate the path loss of UE present position, this circuit loss value is mapped in the power control table, the method that employing is tabled look-up is on the basis of Primary Common Control Physical Channel (Primary Common Control Physical Channel is called for short PCCPCH) transmitting power, adjust the down initial transmitting power of corresponding Target cell, carry out downlink power control.
With reference to shown in Figure 2, illustrate according to system switching method of the present invention.This system switching method comprises: S202, when subscriber equipment from the cell-of-origin when Target cell switches, radio network controller is initiated handover measurement and is received measurement result from subscriber equipment to subscriber equipment, the guiding subscriber equipment switches; S204, radio network controller is according to the actual emission power of measurement result and Target cell, calculate the path loss between subscriber equipment and the Target cell, by path loss being mapped to the Initial Trans that the down initial transmitting power control table obtains Target cell, and send the switching command that comprises Initial Trans information to Target cell; And S206, Target cell sends information according to switching command to subscriber equipment, and subscriber equipment is finished switching according to information.
Wherein, step S202 may further comprise the steps (shown in Fig. 3 a): S2022, and radio network controller is initiated handover measurement by the node of cell-of-origin to subscriber equipment; S2024, subscriber equipment carries out handover measurement, and the result of handover measurement is reported radio network controller; And S2026, radio network controller is according to switching condition, and the guiding subscriber equipment switches.
Wherein, step S204 is the process that is used to carry out descending power control.This process specifically comprises (shown in Fig. 3 b): S2042, and radio network controller calculates the path loss between subscriber equipment and the Target cell; S2044, radio network controller is mapped to path loss in the descending power control table, obtains corresponding Initial Trans; S2046, radio network controller send the switching command that comprises Initial Trans information to Target cell.
Wherein, the down initial transmitting power control table comprises: with respect to the down transmitting power offset information of Primary Common Control Physical Channel and the path loss information of radio network controller calculating.The down initial transmitting power control table may further include signal interference ratio constraints.
Particularly, the Poewr control method of the system switching method of Ti Chuing in this application, the measurement result that to be RNC report according to UE and the actual emission power of Target cell calculate descending path loss, and descending circuit loss value is mapped in the corresponding down transmitting power control table.
Wherein, the down transmitting power control table is as follows:
Table 1
| Rank | Down transmitting power skew (dB) with respect to PCCPCH | UE and the path loss between Target cell (dB) that RNC calculates according to the measurement result that UE reports |
| 1 grade | X1 | ?Y1 |
| 2 grades | X2 | ?Y2 |
| ... | ... | ?... |
| The N level | Xn | ?Yn |
Table 1 is a mapping relations signal table between Initial Trans and the path loss, wherein the path loss that calculates has been carried out classification, every grade of corresponding different respectively down initial transmitting power.In actual use, because the error of path loss, so will calculate the supplementary constraints condition of SIR as mapping relations between above-mentioned transmitting power and the path loss, if SIR, thinks then that the path loss that calculates is believable greater than thresholding.After introducing SIR, improved the reliability that down transmitting power is adjusted.In table 2, increased this constraints.
Table 2
| Rank | Down transmitting power skew (dB) with respect to PCCPCH | UE and the path loss between Target cell (dB) that RNC calculates according to the measurement result that UE reports | SIR constraints |
| 1 grade | X1 | Y1 | Whether SIR surpasses thresholding |
| 2 grades | X2 | Y2 | Whether SIR surpasses thresholding |
| ... | ... | ... | ? |
| The N level | Xn | Yn | Whether SIR surpasses thresholding |
Table 2 can carry out refinement according to different situations, and the table 3 among the embodiment is thinner divisions.
| Rank | Down transmitting power skew (dB) with respect to PCCPCH | UE and the path loss between Target cell (dB) that RNC calculates according to the measurement result that UE reports | SIR constraints (establishing thresholding is 9dB) |
| 1 | X＝-4 | Y＞120 | Whether SIR surpasses thresholding, if do not have, then X is invalid, and power adjustment skew is 0 |
| 2 | X＝-6 | 120＞＝Y＞110 | Whether SIR surpasses thresholding, if do not have, then X is invalid, and power adjustment skew is 0 |
| 3 | X＝-8 | 110＞＝Y | Whether SIR surpasses thresholding, if do not have, then X is invalid, and power adjustment skew is 0 |
With reference to figure 4, the concrete implementation step according to system switching method of the present invention is described:
Step 1, RNC initiates handover measurement through cell-of-origin Node B to UE, as (1) among Fig. 4, (2);
Step 2, UE carries out handover measurement, as (3) among Fig. 4;
Step 3, UE reports RNC with measurement result through Node B, as (4) (5) among Fig. 4;
Step 4, RNC judges whether to satisfy switching condition, as (6) among Fig. 4;
Step 5 satisfies switching condition, and guiding UE switches, as (7) among Fig. 4, (8);
Step 6, UE reads the down channel of cell-of-origin, prepares to switch (physical channel reprovision), as (9) among Fig. 4;
Step 7, RNC calculates path loss between UE and Target cell by UE reporting measurement result, as (10) among Fig. 4;
Step 8, RNC tables look-up 3 according to path loss, obtains corresponding Target cell Initial Trans, as (11) among Fig. 4;
Step 9, RNC sends hand off signaling to Target cell, comprises the configuration of Target cell down initial transmitting power, and as (12) among Fig. 4, generally speaking, this process is carried out after step 5, step 6, step 7, step 8;
Step 10, Target cell send information to UE, as (13) among Fig. 4 according to RNC downlink signaling and Initial Trans;
Step 11, UE reads the downlink information of Target cell.
With reference to figure 5, the switching device shifter according to system of the present invention is described.This system's switching device shifter.This device comprises: switching and booting module 502, be used for when subscriber equipment from the cell-of-origin when Target cell switches, make radio network controller initiate handover measurement and receive measurement result from subscriber equipment to subscriber equipment, the guiding subscriber equipment switches; Power control module 504, be used to make the actual emission power of radio network controller according to measurement result and Target cell, calculate the path loss between subscriber equipment and the Target cell, by path loss being mapped to the Initial Trans that the down initial transmitting power control table obtains Target cell, and send the switching command that comprises Initial Trans information to Target cell; And switch and to finish module 506, be used to make Target cell to send information to subscriber equipment, and make subscriber equipment finish switching according to information according to switching command.
Wherein, the switching and booting module comprises: handover measurement is initiated submodule 5022, and the node that is used to make radio network controller pass through the cell-of-origin is initiated handover measurement to subscriber equipment; Handover measurement implementation sub-module 5024 is used to make subscriber equipment to carry out handover measurement, and the result of handover measurement is reported radio network controller; And switching and booting submodule 5026, be used to make radio network controller according to switching condition, the guiding subscriber equipment switches.
Wherein, power control module is the device that is used for descending power control, and it comprises: path loss computing module 5042 is positioned at Wi-Fi controller side, be used for to switch to from the cell-of-origin under the situation of Target cell, calculate the path loss between subscriber equipment and the Target cell at subscriber equipment; Power acquisition module 5044 is positioned at the radio network controller side, is used for path loss is mapped to the descending power control table, obtains corresponding Initial Trans; Switching command sending module 5046 is positioned at the radio network controller side, is used for sending the switching command that comprises Initial Trans information to Target cell.
Wherein, the down initial transmitting power control table comprises: with respect to the down transmitting power offset information of Primary Common Control Physical Channel and the described path loss information of described radio network controller root calculating.The down initial transmitting power control table may further include signal interference ratio constraints.
By the present invention, can make Target cell send information to subscriber equipment with suitable power, thereby can guarantee that subscriber equipment correctly receives information, can not cause too much influence again to other subscriber equipmenies and other sub-districts, simultaneously, can not cause too big influence with the power of other channels in the time slot to Target cell yet.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. method for controlling downlink power that is used to switch is characterized in that may further comprise the steps:
S2042 need switch to from the cell-of-origin under the situation of Target cell at subscriber equipment, and radio network controller calculates the path loss between described subscriber equipment and the described Target cell;
S2044, described radio network controller is mapped to described path loss in the descending power control table, obtains corresponding Initial Trans;
S2046, described radio network controller send the switching command that comprises described Initial Trans information to described Target cell.
2. method for controlling downlink power according to claim 1, it is characterized in that described radio network controller calculates path loss between described subscriber equipment and the described Target cell according to the actual emission power of the handover measurement of described user equipment to report and described Target cell.
3. method for controlling downlink power according to claim 1, it is characterized in that described descending power control table comprises: with respect to the down transmitting power offset information of Primary Common Control Physical Channel and the described path loss information of described radio network controller calculating.
4. method for controlling downlink power according to claim 3 is characterized in that, described descending power control table further comprises signal interference ratio constraints.
5. descending power control device that is used to switch is characterized in that comprising:
The path loss computing module is positioned at the radio network controller side, is used for need switching under the situation of Target cell from the cell-of-origin at subscriber equipment, calculates the path loss between described subscriber equipment and the described Target cell;
The power acquisition module is positioned at described radio network controller side, is used for described path loss is mapped to the descending power control table, obtains corresponding Initial Trans;
The switching command sending module is positioned at described radio network controller side, is used for sending the switching command that comprises described Initial Trans information to described Target cell.
6. descending power control device according to claim 5, it is characterized in that described path loss computing module calculates path loss between described subscriber equipment and the described Target cell according to the actual emission power of the handover measurement of described user equipment to report and described Target cell.
7. descending power control device according to claim 5, it is characterized in that described descending power control table comprises: with respect to the down transmitting power offset information of Primary Common Control Physical Channel and the described path loss information of described radio network controller calculating.
8. descending power control device according to claim 7 is characterized in that, described descending power control table further comprises signal interference ratio constraints.
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| CN2006101370618A CN101166044B (en) | 2006-10-19 | 2006-10-19 | Downlink power control method and device for switching |
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| CN2006101370618A CN101166044B (en) | 2006-10-19 | 2006-10-19 | Downlink power control method and device for switching |
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| CN101166044B true CN101166044B (en) | 2011-08-24 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101568171B (en) * | 2008-04-25 | 2012-01-25 | 中兴通讯股份有限公司 | Closed loop power control method of non-scheduling service in high-speed uplink packet access technique |
| CN101873657B (en) * | 2009-04-23 | 2014-12-10 | 中兴通讯股份有限公司 | Method for estimating quality of uplink signal in neighboring area and switching and optimizing method |
| CN101938773B (en) | 2009-06-30 | 2014-11-05 | 中兴通讯股份有限公司 | Initial transmitting power acquisition method and base station |
| CN104754714A (en) * | 2013-12-30 | 2015-07-01 | 中兴通讯股份有限公司 | Method and device for determining sending power of switchover command and base station |
| US9918280B1 (en) * | 2016-11-08 | 2018-03-13 | Nxp B.V. | Method and system for automatic power control (APC) in a communications device that communicates via inductive coupling |
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| CN1285093A (en) * | 1997-12-15 | 2001-02-21 | 艾利森电话股份有限公司 | Base station transmit power control in CDMA cellular telephone system |
| US6771963B1 (en) * | 1998-08-17 | 2004-08-03 | Lucent Technologies Inc. | Triggering handdowns and handoffs of mobile stations between bordering cells of cellular wireless communication systems |
| CN1578490A (en) * | 2003-06-26 | 2005-02-09 | 北京三星通信技术研究有限公司 | Measurement method for switching inter RNC control frquency and intersystem |
| US20060223447A1 (en) * | 2005-03-31 | 2006-10-05 | Ali Masoomzadeh-Fard | Adaptive down bias to power changes for controlling random walk |
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2006
- 2006-10-19 CN CN2006101370618A patent/CN101166044B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1285093A (en) * | 1997-12-15 | 2001-02-21 | 艾利森电话股份有限公司 | Base station transmit power control in CDMA cellular telephone system |
| US6771963B1 (en) * | 1998-08-17 | 2004-08-03 | Lucent Technologies Inc. | Triggering handdowns and handoffs of mobile stations between bordering cells of cellular wireless communication systems |
| CN1578490A (en) * | 2003-06-26 | 2005-02-09 | 北京三星通信技术研究有限公司 | Measurement method for switching inter RNC control frquency and intersystem |
| US20060223447A1 (en) * | 2005-03-31 | 2006-10-05 | Ali Masoomzadeh-Fard | Adaptive down bias to power changes for controlling random walk |
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