CN102045824A - Method for controlling power of downlink channel of trunking communication system, base station and mobile station - Google Patents
Method for controlling power of downlink channel of trunking communication system, base station and mobile station Download PDFInfo
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- CN102045824A CN102045824A CN2009102075798A CN200910207579A CN102045824A CN 102045824 A CN102045824 A CN 102045824A CN 2009102075798 A CN2009102075798 A CN 2009102075798A CN 200910207579 A CN200910207579 A CN 200910207579A CN 102045824 A CN102045824 A CN 102045824A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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Abstract
The invention discloses a method for controlling power of a downlink channel of a trunking communication system. The method comprises the steps that: a base station detects whether power control signals from group users exist on uplink time slots corresponding to group users; the base station carries out the power control on the downlink channel corresponding to the users which are connected to the base station according to the detection results. By the method, the transmitting power of the downlink channel can be rapidly regulated, the inner interference of a system is reduced, and the system capacity is improved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of method, base station and travelling carriage of trunked communication system downlink channel power control.
Background technology
Trunked communication system is a kind of resource-sharing, radio equipment and serves shared multipurpose, dynamical wireless dispatching communication system, can centralized control and management channel and give group user with the dynamical fashion allocated channel.Trunked communication system says that the user can corresponding a plurality of tins of users for one when carrying out group calling or multicast service, therefore, system can provide Radio Link for a plurality of tins of users at one time.This Radio Link is downlink traffic channel, and this downlink traffic channel is shared by a plurality of tins of users and used.
The publication number of Huawei Tech Co., Ltd is that the name of CN1812282 (grant number is CN100438368C) is called in the Poewr control method of shared channel " a kind of in the CDMA digital cluster system " and discloses following content: the travelling carriage in the sub-district is reported power control information by up channel to the base station, the power control information of a group user is collected in the base station in a period of time, these information are risen according to having to rise then, then fall to such an extent that principle is carried out downlink channel power control with falling.The method of this patent disclosure needs the user that listens in the group all to utilize up channel to report power control information to the base station on the one hand, and number of users certainly will take a large amount of up channels more for a long time in group, and system effectiveness is reduced greatly; On the other hand, all users' of this group power control information need be collected and detect in the base station, through judging that the back rises according to having to rise then, carry out power control with falling the principle of then falling, the base station collection and the judgement that need expend time in and carry out power control information like this, cause the power control information of reporting of user to lack actual effect, make the poor effect of power control.
Effectively reduce trunked communication system down channel transmitting power, to reducing system interference, improving power system capacity plays an important role, therefore, need on the basis of correlation technique, seek a kind of method of downlink channel power fast and efficiently that is suitable for trunked communication system, especially be applicable to that TD SDMA inserts the method for downlink channel power fast and efficiently of (Time Division-SynchronousCode Division Multiple Access abbreviates TD-SCDMA as) trunked communication system.
Problem in the correlation technique downlink channel power control of trunked communication system being lacked actual effect, poor effect does not propose effective solution at present as yet.
Summary of the invention
Lack the problem of actual effect, poor effect and propose the present invention at the downlink channel power control to trunked communication system in the correlation technique, for this reason, main purpose of the present invention is to provide a kind of scheme of trunked communication system downlink channel power control, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of method of trunked communication system downlink channel power control.
Method according to trunked communication system downlink channel power control of the present invention comprises: the power control signal that whether has from group user is detected at the ascending time slot of group user correspondence in the base station; The base station is carried out power control according to the result who detects to the down channel of user's correspondence of being connected to the base station in the group user.
Preferably, the base station is carried out power control to the down channel of user's correspondence of being connected to the base station in the group user and comprised: under the base station detected situation from the power control signal of group user, the transmitting power of the down channel of the user's correspondence that is connected to the base station in the group user was improved in the base station.
Preferably, the base station is carried out power control to the down channel of user's correspondence of being connected to the base station in the group user and comprised: under the base station did not detect situation from the power control signal of group user, the base station did not change the transmitting power of the down channel of the user's correspondence that is connected to the base station in the group user.
Preferably, the base station is carried out power control to the down channel of user's correspondence of being connected to the base station in the group user and is comprised: do not detect under the situation of power control signal at interval at preset time in the base station, when preset time finished at interval, the base station reduced the transmitting power of the down channel of the user's correspondence that is connected to the base station in the group user.
Preferably, in the base station before the ascending time slot of group user correspondence detects the power control signal of group user, the one or more users that are connected to the base station in the group user are when detecting the transmitting power that needs the base station to improve down channel, to the base-station transmitting-power control signal, wherein, power control signal has desirable circulation autocorrelation performance.
To achieve these goals, according to a further aspect in the invention, provide a kind of base station.
Base station according to the present invention comprises: first detection module is used for detecting the power control signal that whether has from group user at the ascending time slot of group user correspondence; Power control module is used for according to the result who detects the down channel that group user is connected to user's correspondence of base station being carried out power control.
Preferably, power control module specifically is used for improving the transmitting power of the down channel of the user's correspondence that is connected to the base station in the group user under first detection module detects situation from the power control signal of group user.
Preferably, power control module specifically is used for not changing the transmitting power of the down channel of the user's correspondence that is connected to the base station in the group user under first detection module does not detect situation from the power control signal of group user.
Preferably, power control module specifically is used for not detecting under the situation of power control signal in the preset time interval at first detection module, when preset time finishes at interval, reduce the transmitting power of the down channel of the user's correspondence that is connected to the base station in the group user.
To achieve these goals, according to another aspect of the invention, provide a kind of travelling carriage.
Travelling carriage according to the present invention comprises: second detection module is used to detect the transmitting power that down channel is improved in the base station that whether needs travelling carriage to connect; Sending module is used for to the base-station transmitting-power control signal, and wherein, power control signal has desirable circulation autocorrelation performance.
By the present invention, adopt the base station by judging whether to receive the mode of carrying out downlink channel power control from the power control signal of group user, solved and in the correlation technique downlink channel power of trunked communication system has been controlled the problem of shortage actual effect, poor effect, and then reached the transmitting power adjustment of carrying out down channel fast, the effect that reduces the internal system interference and improve power system capacity.
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 flow chart according to the method for the trunked communication system downlink channel power control of the embodiment of the invention;
Fig. 2 is the flow chart according to the concrete grammar of downlink channel power control in the trunked communication system of the embodiment of the invention;
Fig. 3 is the schematic diagram according to ascending time slot emission Zadoff-Chu sequence position in the assigned timeslot structure of the embodiment of the invention;
Fig. 4 is the structured flowchart according to the base station of the embodiment of the invention;
Fig. 5 is the structured flowchart according to the travelling carriage of the embodiment of the invention.
Embodiment
Functional overview
Consider the problem that in the correlation technique downlink channel power control of trunked communication system is lacked actual effect, poor effect, the invention provides a kind of scheme of trunked communication system downlink channel power control, the treatment principle of this scheme is as follows: the power control signal that whether has from group user is detected at the ascending time slot of group user correspondence in the base station; The base station is carried out power control according to the result who detects to the down channel of user's correspondence of being connected to the base station in the group user.By the present invention, the power control information that reports to the base station of transmission group user is adjusted the transmitting power of down channel apace efficiently, has reduced the internal system interference, and has improved power system capacity.
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Method embodiment
According to embodiments of the invention, provide a kind of method of trunked communication system downlink channel power control.
Fig. 1 is the flow chart according to the method for the trunked communication system downlink channel power of embodiment of the invention control, and as shown in Figure 1, this method comprises that following step S102 is to step S104:
Step S102, the power control signal that whether has from group user is detected at the ascending time slot of group user correspondence in the base station;
Step S104, the base station is carried out power control according to the result who detects to the down channel of user's correspondence of being connected to the base station in the group user.
Power control is carried out to the down channel of user's correspondence of being connected to this base station in the group user in the following manner in the base station.
Mode one
Under the base station detects situation from the power control signal of group user, for example, in the detection window of appointment, detect power control signal, the transmitting power of the down channel of the user's correspondence that is connected to this base station in group user is improved in this base station.
Mode two
Under the base station does not detect situation from the power control signal of group user, for example, in the detection window of appointment, do not detect the feedback information of relevant groups, this base station does not change the transmitting power of the down channel of the user's correspondence that is connected to this base station in the group user, that is, the base station still sends by original transmitting power.
Mode three
Do not detect under the situation of power control signal in the preset time interval in the base station, when preset time finishes at interval, the base station reduces the transmitting power of the down channel of the user's correspondence that is connected to the base station in the group user, till adjusting to suitable transmission power.
In the base station before the ascending time slot of group user correspondence detects the power control signal of group user, the one or more users that are connected to this base station in the group user are when detecting the transmitting power that needs the base station to improve down channel, to the base-station transmitting-power control signal, for example, the power control signal of emission particular offset, wherein, power control signal has desirable circulation autocorrelation performance, and can utilize the different detection window that are offset to distinguish the power control information of different groups.
When needing, promptly, when detecting the transmitting power that needs the base station to improve down channel, the same group user that is connected to same base station at special time simultaneously to the base station transmitting power control signal, this signal has desirable circulation autocorrelation performance, and can utilize the different detection window that are offset to distinguish the power control information of different groups.
By introducing new power control signal, make the base station can distinguish having of different groups power control signal or do not have, if get access to the power control signal of certain group, then improve this group's down channel transmitting power, if do not obtain the power control signal for the treatment of certain group, then keep or reduce this group's down channel transmitting power.By this method, can make the base station carry out the adjustment of trunking communication down channel transmitting power fast and efficiently, reduced co-channel interference to adjacent sub-district, promoted the capacity of trunked communication system.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
Be example with the TD-SCDMA system below, the method that the trunked communication system downlink channel power is controlled describes, and should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and is not used in qualification the present invention.
Fig. 2 is the flow chart according to the concrete grammar of downlink channel power control in the trunked communication system of the embodiment of the invention.As shown in Figure 2, this method may further comprise the steps S201 to step S204:
Step S201 determines the form of the power control signal of each group.
Fig. 3 is the schematic diagram according to ascending time slot emission Zadoff-Chu sequence position in the assigned timeslot structure of the embodiment of the invention, use the Zadoff-Chu sequence as power control signal, the power control signal of the group that different female sign indicating number cyclic shift representatives is different.
The auto-correlation of Zadoff-Chu sequence code is desirable, and all the other all are 0 except main lobe, and cross-correlation is 0 within the specific limits, and another benefit of using this sequence is that the mould of sequence is a constant, and all the peak is than smaller.
Can be for choosing of Zadoff-Chu sequence with reference to the mode of choosing of long-term advancing time division duplex (Long-Term Evolution Time Division Duplex abbreviates TDD-LTE as), the length of choosing is N
ZcThe operable length of ascending time slot is 864chip in the TD-SCDMA system, and rest parts can be used for protection.
A Zadoff-Chu root of each cell selecting sequence is N by this root sequence is carried out length in the group system
CsCyclic shift, can obtain the Zadoff-Chu sequence of each group's correspondence, can determine N according to group's capacity of each sub-district maximum in the trunked communication system
CsSize.
Step S202, whether group user adjudicates the transmitting power control signal according to the down channel quality that receives.
Step S203, the base station is detected at corresponding up time slot, if detect power control signal in the detection window of appointment, then the down channel transmitting power of corresponding group is improved in the base station; If do not detect power control signal in the detection window of appointment, then the base station keeps corresponding group down channel transmitting power.
The process that group's feedback information is detected in the base station specifically comprises:
1), the base station receives the feedback information x of group user emission at the ascending time slot of appointment, respectively root sequences y and the information of reception x made N
ZcPoint fast Fourier conversion (Fast FourierTransform abbreviates FFT as) obtains Y and X;
2), in the FFT territory, Y and X are complex conjugate dot product: R=X.*conj (Y);
3), R is made N
ZcPoint, inverse fast Fourier transform (Inverted Fast FourierTransform abbreviates IFFT as) transforms to time domain r, seeks peak value according to the time domain correlation in detection window,, checks whether the group of this detection window correspondence has field feedback that is.Maximum and the threshold value that to carry out each detection window of time domain after relevant compare, if greater than thresholding then there is the user emission power control signal in this group, if less than thresholding then think this group's no user transmitting power control signal.
Step S204 if the base station does not detect the power control signal of this group in particular time interval, then reduces the down channel transmitting power of this group, till adjusting to suitable transmission power by certain step-length.
Device embodiment
According to embodiments of the invention, provide a kind of base station.
Fig. 4 is the structured flowchart according to the base station of the embodiment of the invention, and as shown in Figure 4, this device comprises: first detection module 42, power control module 44 are described in detail this structure below.
First detection module 42 is used for detecting the power control signal that whether has from group user at the ascending time slot of group user correspondence; Power control module 44 is connected to detection module 42, is used for according to the result who detects the down channel that group user is connected to user's correspondence of base station being carried out power control.
Wherein, power control module 44 specifically is used for improving the transmitting power of the down channel of the user's correspondence that is connected to the base station in the group user under first detection module 42 detects situation from the power control signal of group user.
Power control module 44 specifically is used for not changing the transmitting power of the down channel of the user's correspondence that is connected to the base station in the group user under first detection module 42 does not detect situation from the power control signal of group user.
Power control module 44 specifically is used for not detecting under the situation of power control signal in the preset time interval at first detection module 42, when preset time finishes at interval, reduce the transmitting power of the down channel of the user's correspondence that is connected to the base station in the group user.
According to embodiments of the invention, provide a kind of travelling carriage.
Fig. 5 is the structured flowchart according to the travelling carriage of the embodiment of the invention, and as shown in Figure 5, this device comprises: second detection module 52, sending module 54 are elaborated to this structure below.
Second detection module 52 is used to detect the transmitting power that down channel is improved in the base station that whether needs travelling carriage to connect; Sending module 54 is connected to second detection module 52, is used for to the base-station transmitting-power control signal, and wherein, power control signal has desirable circulation autocorrelation performance.
Need to prove that base station of describing among the device embodiment and travelling carriage are corresponding to above-mentioned method embodiment, its concrete implementation method had been carried out detailed description in method embodiment, do not repeat them here.
In sum, adopt the present invention, can adjust the transmitting power of down channel apace, reduced the internal system interference, and improved power system capacity.
Need to prove, can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
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 (10)
1. the method for a trunked communication system downlink channel power control is characterized in that, comprising:
The power control signal that whether has from described group user is detected at the ascending time slot of group user correspondence in the base station;
Described base station is carried out power control according to the result of described detection to the down channel of user's correspondence of being connected to described base station in the described group user.
2. method according to claim 1 is characterized in that, described base station is carried out power control to the down channel of user's correspondence of being connected to described base station in the described group user and comprised:
Under described base station detected situation from the power control signal of described group user, the transmitting power of the down channel of the user's correspondence that is connected to described base station in the described group user was improved in described base station.
3. method according to claim 1 is characterized in that, described base station is carried out power control to the down channel of user's correspondence of being connected to described base station in the described group user and comprised:
Under described base station did not detect situation from the power control signal of described group user, described base station did not change the transmitting power of the down channel of the user's correspondence that is connected to described base station in the described group user.
4. method according to claim 3 is characterized in that, described base station is carried out power control to the down channel of user's correspondence of being connected to described base station in the described group user and comprised:
Do not detect under the situation of described power control signal in the preset time interval in described base station, when described preset time finished at interval, described base station reduced the transmitting power of the down channel of the user's correspondence that is connected to described base station in the described group user.
5. according to each described method in the claim 1 to 4, it is characterized in that before the ascending time slot of described group user correspondence detected the power control signal of described group user, described method also comprised in described base station:
The one or more users that are connected to described base station in the described group user are when detecting the transmitting power that needs described base station to improve down channel, to described base-station transmitting-power control signal, wherein, described power control signal has desirable circulation autocorrelation performance.
6. a base station is characterized in that, comprising:
First detection module is used for detecting the power control signal that whether has from described group user at the ascending time slot of group user correspondence;
Power control module is used for according to the result of described detection the down channel that described group user is connected to user's correspondence of described base station being carried out power control.
7. base station according to claim 6, it is characterized in that, described power control module specifically is used for improving the transmitting power of the down channel of the user's correspondence that is connected to described base station in the described group user under described first detection module detects situation from the power control signal of described group user.
8. base station according to claim 6, it is characterized in that, described power control module specifically is used for not changing the transmitting power of the down channel of the user's correspondence that is connected to described base station in the described group user under described first detection module does not detect situation from the power control signal of described group user.
9. base station according to claim 8, it is characterized in that, described power control module specifically is used for not detecting under the situation of described power control signal in the preset time interval at described first detection module, when described preset time finishes at interval, reduce the transmitting power of the down channel of the user's correspondence that is connected to described base station in the described group user.
10. a travelling carriage is characterized in that, comprising:
Second detection module is used to detect the transmitting power that down channel is improved in the base station that whether needs described travelling carriage to connect;
Sending module is used for to described base-station transmitting-power control signal, and wherein, described power control signal has desirable circulation autocorrelation performance.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102075798A CN102045824A (en) | 2009-10-22 | 2009-10-22 | Method for controlling power of downlink channel of trunking communication system, base station and mobile station |
| PCT/CN2010/074780 WO2010145610A1 (en) | 2009-10-22 | 2010-06-30 | Method, base station and mobile station for downlink channel power control in cluster communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102075798A CN102045824A (en) | 2009-10-22 | 2009-10-22 | Method for controlling power of downlink channel of trunking communication system, base station and mobile station |
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| CN102045824A true CN102045824A (en) | 2011-05-04 |
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| CN2009102075798A Pending CN102045824A (en) | 2009-10-22 | 2009-10-22 | Method for controlling power of downlink channel of trunking communication system, base station and mobile station |
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| WO (1) | WO2010145610A1 (en) |
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| CN105027616A (en) * | 2012-12-28 | 2015-11-04 | 株式会社Ntt都科摩 | User equipment, base stations, interference reduction method, and interference reduction control information transmission method |
| CN105307253A (en) * | 2014-07-29 | 2016-02-03 | 普天信息技术有限公司 | Power control method, system and device for high-power cluster terminal |
| WO2016201594A1 (en) * | 2015-06-15 | 2016-12-22 | 海能达通信股份有限公司 | Method, terminal and system for cluster terminal to feed back downlink channel information |
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| CN1685638A (en) * | 2002-09-19 | 2005-10-19 | 松下电器产业株式会社 | Method and base station equipment for controlling transmission power |
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| CN105027616A (en) * | 2012-12-28 | 2015-11-04 | 株式会社Ntt都科摩 | User equipment, base stations, interference reduction method, and interference reduction control information transmission method |
| CN105027616B (en) * | 2012-12-28 | 2019-08-16 | 株式会社Ntt都科摩 | User apparatus, base station, interference reducing method and interference reduce control information notice method |
| CN105307253A (en) * | 2014-07-29 | 2016-02-03 | 普天信息技术有限公司 | Power control method, system and device for high-power cluster terminal |
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| WO2016201594A1 (en) * | 2015-06-15 | 2016-12-22 | 海能达通信股份有限公司 | Method, terminal and system for cluster terminal to feed back downlink channel information |
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| WO2010145610A1 (en) | 2010-12-23 |
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Application publication date: 20110504 |