CN1812282A - Power controlling method for sharing channel in CDMA digital group system - Google Patents
Power controlling method for sharing channel in CDMA digital group system Download PDFInfo
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- CN1812282A CN1812282A CNA2005100026676A CN200510002667A CN1812282A CN 1812282 A CN1812282 A CN 1812282A CN A2005100026676 A CNA2005100026676 A CN A2005100026676A CN 200510002667 A CN200510002667 A CN 200510002667A CN 1812282 A CN1812282 A CN 1812282A
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- travelling carriage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
This invention provides a kind of power controlling method for digital integrated system shared channel. It concludes: the moving station in subzone reports power controlling feedback information to the base station through backward channel; the power controlling feedback information is analyzed by the base station, which gets power controlling information of the said moving station; based on the power controlling information, the base station changes the power of forward shared channel. The power of forward shared channel can be controlled according to predetermined step length and amplitude. It can not only decrease the spending of forward power and decrease the common-frequency interference to neighboring areas, but can also support freely movement.
Description
Technical field
The present invention relates to the network communications technology, relate in particular to a kind of in the CDMA digital cluster system Poewr control method of shared channel.
Background technology
Utilize common mobile communication network to provide value added service and realize that the function that private network provides is the trend of communications industry development.In this trend, by carry out upgrading on Digital Cellular System, the scheduling voice functions that provided professional in the past group system just can provide in common mobile communication network is one of focus of present communications industry development.Therefore, in the standard of 2.5G and 3G, increased the definition of support push-to-talk PTT (Push To Talk) function gradually, the mobile communication carrier of at present existing a plurality of countries can provide PTT business to the user, and for example, U.S. NEXTEL is that the PTT business is carried out a most successful tame operator.
The telecommunications manufacturer in the whole world and operator can provide the PTT solution based on GPRS/3G (GPRS/third generation network), what terminal manufacturer was also positive simultaneously transforms on cellular terminal to support the PTT function, as increase the PTT talk button, intercom is with loud speaker etc., to the transformation of cellular system is existing function based on existing equipment, mode with value-added service provides PTT business, generally to the change of network side based on software upgrading, and can realize coexisting, and shared various network resources with every business realizing of original cellular system.
Manufacturers such as at present existing Qualcomm, Motorola can provide the PTT business based on cdma network, its solution majority based on data service as realizing in VOIP (IP phone) mode, Internet, instant software such as functions such as QQ, ICQ, MSN Message have wherein also been introduced, but the PTT business that it provided is different from the schedule voice business of professional cluster, and is poorer than professional group system aspect real-time.
In the PTT of professional group system business, usually be to utilize the forward shared channel in honeycomb system mobile system to communicate, described forward shared channel refers to the forward channel in the single sectors/cells, during utilizing forward shared channel to communicate, because user's distribution does not have definite rule in the group, user in the group may be distributed in a certain zone in the sub-district, as locating near the base station, perhaps accumulate in cell edge, in order to reduce system interference better, reduce power consumption, and the moving freely of user in the support group, even handover, adopting power control is a kind of necessary means.
Yet in the control of the power of prior art, when the moving freely of user in the group, power consumption is big, and is also bigger to the co-channel interference of adjacent area.
Summary of the invention
The objective of the invention is shortcoming, the Poewr control method of digital cluster system shared channel is provided, thereby has reduced system interference at above-mentioned prior art, the moving freely of user in the support group, even during handover, reduced power consumption.
The invention provides the Poewr control method of digital cluster system shared channel, comprising:
Travelling carriage in A, the sub-district is reported power Control and Feedback information by backward channel to the base station;
B, base station are analyzed power Control and Feedback information, and obtain the power control information of described travelling carriage;
C, base station change the power of forward shared channel according to described power control information.
Power Control and Feedback information described in the described steps A comprises: message is carried frame error rate or power control sub-channel information.
Power control information described in the described step B comprises reduction power, rising power and keeps current power.
Described step C further comprises: when the power control information of all travelling carriages is reduction power, then reduce the power of forward shared channel, till wherein the power control information of arbitrary travelling carriage becomes rising power or keeps current power according to predetermined step-length and predetermined amplitude.
Described step C further comprises: when the power control information of arbitrary travelling carriage is rising power, then according to the power of being scheduled to step-length and predetermined amplitude rising forward shared channel, till the power control information of described travelling carriage becomes reduction power or keeps current power.
Described steps A also comprises, when travelling carriage switches, reduces the power of former sub-district according to predetermined step-length and predetermined amplitude, and the power control information of at least one travelling carriage in former sub-district is rising power or keeps till the current power.
Described switching comprises switching to increase branch and switch removes branch.
Described switching is removed branch and is comprised that the base station of former sub-district removes the backward channel of former travelling carriage, and determines whether forward shared channel is removed according to the operating position of forward shared channel.
Described operating position according to forward shared channel determines whether the forward shared channel dismounting is comprised: judges whether that other travelling carriage takies forward shared channel in addition,, then do not remove forward shared channel if having, otherwise, remove forward shared channel.
Utilize the present invention, rise according to having to rise then, the power of forward shared channel is controlled according to predetermined step-length and predetermined amplitude, not only can reduce the expense of forward power with falling the principle of then falling, minimizing is to the co-channel interference of adjacent area, can also the support group in the moving freely of user.
Description of drawings
Fig. 1 is a power control schematic diagram of the present invention;
Fig. 2 shows the schematic diagram that travelling carriage is moved to Target cell by former sub-district;
Fig. 3 shows soft handover branches and adds schematic flow sheet;
Fig. 4 shows soft handover branches and removes schematic flow sheet.
Embodiment
Understand and realization the present invention the existing embodiments of the invention of describing in conjunction with the accompanying drawings for the ease of persons skilled in the art.
The basic service that group system provides comprises: dispatching services and circuit data; The high speed Packet data service; Express traffic; Express traffic is present between the terminal, and the present invention only analyzes the group-calling service (schedule voice, the interior data broadcasting of group etc.) that relates to system equipment.
In the group-calling service of the group service of mobile cellular system, generally all adopt forward channel to share (being similar to forward channel broadcasting), and employing is similar to the service of cellular sub-district system coverage mode realization to the user, the characteristics of sub-district system system are that covering is less, channel quantity is limited, and transmitting power is also less.
In sub-district system system, the implementation method of forward shared channel has multiple, with existing hardware platform different specific implementations is arranged according to different system versions, for example, below be based on the 4 channel modes of sharing that CDMA2000 1x Release 0 version is realized, compatible forward Release A system:
CDMA group service channel occupation mode (at voice scheduling and broadcasting service)
| Logic channel | Forward channel | Backward channel |
| Common Control Channel | F-PCH&F-QPCH | R-ACH |
| Voice ﹠ circuit data | Share F-FCH (1) ﹠ F-DCCH (1-n supports the DTX pattern) | R-DCCH (1-n) supports DTX pattern and PILOT Gating (1/2,1/4) |
| Signaling | F-DCCH(1-n) | R-DCCH(1-n) |
| Power control | The FPC subchannel is carried on R-DCCH | The RPC subchannel is carried on F-DCCH |
The basic demand that forward channel F-FCH shares has:
(1) forward shared channel Long Code Mask LCM is unique, and the WALSH sign indicating number is unique;
(2) forward direction voice or data message are by unique shared channel F-FCH transmission;
(3) the shared F-FCH channel of forward direction should be realized power control; (the broadcasting share channel of constant transmit power is not as this paper analytic target);
Supposing has a colony dispatching group under certain sub-district (physical sector), the user is more than or equal to 2 in the group, in colony dispatching voice conversation process, whether the user keeps a Traffic Channel such as R-DCCH with carrier signaling, voice and Forward Power Control Subchannel information in talking state in each group, and all users in the group use same forward shared channel.
The base station is by all users' of backward channel collection reception shared channel information Feedback of Power information, i.e. all travelling carriages of monitoring use forward shared channel report the power control command at forward shared channel.Travelling carriage has multiple to the mode of base station report power control information, for example, the power Control and Feedback information of backward channel can be that each travelling carriage carries frame error rate information such as (FER) by the message that backward channel sends, also can be the power control sub-channel information that each travelling carriage carries on backward channel, the feedback information of each travelling carriage is collected in the base station, and judge the demand of each travelling carriage to power according to these Feedback of Power information, described travelling carriage comprises the demand of power: reduce power, rising power and keep current power.And carry out forward shared channel power according to power control information and control.
According to the present invention, introduce the Poewr control method of travelling carriage in a sub-district (physical sector) below, as shown in Figure 1, the feedback information of each travelling carriage is collected in the base station, and judge the demand of each travelling carriage to power according to these Feedback of Power information, carry out the control of forward shared channel power according to power control information then:
Power demand if any a travelling carriage is a rising power, and then the base station increases the shared channel power output according to certain step-length;
Power demand as all travelling carriages is reduction power, and then the base station reduces the shared channel power output according to certain step-length;
At each feedback cycle, the base station will judge the power control information of all travelling carriages, whether the power of shared channel carried out " ascending, descending or maintenance " operation with decision.
Introduce below when the power control situation of travelling carriage when switching, as shown in Figure 2, when travelling carriage by former sub-district when Target cell moves, according to the present invention, because the desired power of travelling carriage that is in two sub-district boundarys is normally maximum, at this moment in the travelling carriage handoff procedure, just begin to reduce power.Poewr control method when travelling carriage switches is described below.
As shown in Figure 3, when travelling carriage gradually away from former sub-district during the target approach sub-district, travelling carriage will report pilot strength measurement report message to give the base station of former sub-district; The pilot strength measurement report message of travelling carriage is received in the base station, judges whether to carry out soft handover, and forward shared channel and dedicated channel are switched respectively during soft handover, and the switching of dedicated channel is with CDMA2000 1x Traffic Channel changing method.
When carrying out soft handover, then shared channel is set up in the notification target base station, and at this moment two kinds of situations are arranged:
A. there is not the forward shared channel of same dispatch group in target BS;
B. target BS has had the forward shared channel of same dispatch group, and different with the forward shared channel of former base station is that coverage is different, and the WALSH sign indicating number may be different, and identical is that Long Code Mask is identical, and the frame biasing is identical.
For situation a, after target BS is received the notice of setting up shared channel, then in soft handover branches increase process, set up forward shared channel; In the flow process that soft handover branches is removed, only remove the backward channel of travelling carriage, and do not need to remove travelling carriage shared channel link usually, have only when not having other travelling carriage use in the former shared channel link, just can remove.Poewr control method when switching is described below.
At first, when the intensity that travelling carriage detects adjacent pilot frequencies surpasses the T_ADD thresholding, report Pilot Strength Measurement Message, former base station starts soft handoff procedure according to certain algorithm and thresholding, promptly at first starts soft handover and increases branch;
When former base station confirm travelling carriage successfully executed switch increase branch after, beginning reduces the forward shared channel transmitting power with certain speed, as with T1 cycle step-length such as 40ms, amplitude is that the mode of D1 such as 0.25dB reduces forward shared channel power; At this moment power reduces operation should promptly progressively reduce forward channel power in the stack on original closed power controlling mechanism on closed power control basis;
Reducing the speed and the step-length of power can adjust, and in order to keep the characteristic of CDMA soft handover, after soft handover increased branch's success, it was that power does not reduce at once that the CDMA power control mode can also be deferred in former base station;
Secondly, as shown in Figure 4, after executing switching increase branch, travelling carriage continues to move, if when detecting the Active Set pilot frequency intensity and being lower than the T_DROP thresholding, travelling carriage will report Pilot Strength Measurement Message, former base station starts to switch according to known algorithm removes branch's flow process, at this moment the switching flow of former base station will be removed the reverse wireless link of former base station, and the operation of power falls by specific step-length and amplitude, for example, be step-length with period T 2 as 20ms, the reduction amplitude is D2 such as 0.5dB or 1dB; Till the requirement of receiving a certain travelling carriage requirement " liter " power under the covering of former base station.
For situation b, promptly there is the forward shared channel situation of same dispatch group in target BS: two kinds of switching modes are arranged:
Travelling carriage can switch to target BS from former base station earlier, and target BS carries out the forward shared channel that direct-cut operation in the base station switches to target BS more then.
The forward shared channel power control mode of former base station adopts the mode that progressively reduces, the forward shared channel power setting of target BS: the soft handover added-time should be got and be switched bigger power in initial power and the original target BS shared channel power; Target BS is regarded travelling carriage as in group user after increasing branch, rises according to having to rise then, and high-fall principle of then falling is carried out power control;
According to the present invention, realized the level and smooth power control of forward shared channel, prevent the appearance of power fluctuation; In the normal handover that guarantees the group calling user, also guaranteed the power demand of former community user; By regulative mode progressively forward shared channel power is adjusted to desired value,, reduced system interference to reduce power consumption.
In addition, the group calling user can move freely in once dispatching the speech process, and is compatible fully with original cdma system, reduced system resource overhead.
According to the present invention, can realize the group service of sub-district system cellular system, can use for reference the networking experience of cellular system fully, under the situation that does not need newly added equipment, just can satisfy the cluster service user demand of a constant volume.
Though described the present invention by embodiment, those of ordinary skills know, without departing from the spirit and substance in the present invention, just can make the present invention that many distortion and variation are arranged, and scope of the present invention is limited to the appended claims.
Claims (9)
1. the Poewr control method of a digital cluster system shared channel is characterized in that, comprising:
Travelling carriage in A, the sub-district is reported power Control and Feedback information by backward channel to the base station;
B, base station are analyzed power Control and Feedback information, and obtain the power control information of described travelling carriage;
C, base station change the power of forward shared channel according to described power control information.
2. the Poewr control method of digital cluster system shared channel according to claim 1 is characterized in that, the power Control and Feedback information described in the described steps A comprises: message is carried frame error rate or power control sub-channel information.
3. the Poewr control method of digital cluster system shared channel according to claim 1 is characterized in that, power control information described in the described step B comprises reduction power, rising power and keeps current power.
4. the Poewr control method of digital cluster system shared channel according to claim 3, it is characterized in that, described step C further comprises: when the power control information of all travelling carriages is reduction power, then reduce the power of forward shared channel, till wherein the power control information of arbitrary travelling carriage becomes rising power or keeps current power according to predetermined step-length and predetermined amplitude.
5. the Poewr control method of digital cluster system shared channel according to claim 3, it is characterized in that, described step C further comprises: when the power control information of arbitrary travelling carriage is rising power, then according to the power of being scheduled to step-length and predetermined amplitude rising forward shared channel, till the power control information of described travelling carriage becomes reduction power or keeps current power.
6. the Poewr control method of digital cluster system shared channel according to claim 1, it is characterized in that, described steps A also comprises, when travelling carriage switches, reduce the power of former sub-district according to predetermined step-length and predetermined amplitude, the power control information of at least one travelling carriage in former sub-district is rising power or keeps till the current power.
7. the Poewr control method of digital cluster system shared channel according to claim 6 is characterized in that, described switching comprises switching to increase branch and switch removes branch.
8. the Poewr control method of digital cluster system shared channel according to claim 7, it is characterized in that, described switching is removed branch and is comprised that the base station of former sub-district removes the backward channel of former travelling carriage, and determines whether forward shared channel is removed according to the operating position of forward shared channel.
9. the Poewr control method of digital cluster system shared channel according to claim 8, it is characterized in that, described operating position according to forward shared channel determines whether the forward shared channel dismounting is comprised: judge whether that other travelling carriage takies forward shared channel in addition, if have, then do not remove forward shared channel, otherwise, remove forward shared channel.
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| CNB2005100026676A CN100438368C (en) | 2005-01-25 | 2005-01-25 | Power controlling method for sharing channel in CDMA digital group system |
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| CNB2005100026676A CN100438368C (en) | 2005-01-25 | 2005-01-25 | Power controlling method for sharing channel in CDMA digital group system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8295225B2 (en) | 2006-09-08 | 2012-10-23 | Qualcomm Incorporated | Reverse link feedback for interference control in a wireless communication system |
| CN102790985A (en) * | 2012-07-31 | 2012-11-21 | 北京拓明科技有限公司 | Automatic optimization method for special scene cell |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6961572B2 (en) * | 2001-12-20 | 2005-11-01 | Motorola, Inc. | Method and apparatus for base-initiated, CDMA-dispatch soft handoff |
| CN100527655C (en) * | 2003-06-09 | 2009-08-12 | 华为技术有限公司 | A method for implementing cluster service in CDMA system |
| CN1264295C (en) * | 2003-07-07 | 2006-07-12 | 深圳市中兴通讯股份有限公司 | A channel sharing method of CDMA standard trunked communication system |
-
2005
- 2005-01-25 CN CNB2005100026676A patent/CN100438368C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8295225B2 (en) | 2006-09-08 | 2012-10-23 | Qualcomm Incorporated | Reverse link feedback for interference control in a wireless communication system |
| CN101512924B (en) * | 2006-09-08 | 2013-10-02 | 高通股份有限公司 | Reverse link feedback for interference control in wireless communication system |
| US9078219B2 (en) | 2006-09-08 | 2015-07-07 | Qualcomm Incorporated | Reverse link feedback for interference control in a wireless communication system |
| CN102790985A (en) * | 2012-07-31 | 2012-11-21 | 北京拓明科技有限公司 | Automatic optimization method for special scene cell |
| CN102790985B (en) * | 2012-07-31 | 2015-01-07 | 北京拓明科技有限公司 | Automatic optimization method for special scene cell |
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| CN100438368C (en) | 2008-11-26 |
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Granted publication date: 20081126 Termination date: 20180125 |