CN1780171A - Method for controlling public channel transmissive power in base station - Google Patents
Method for controlling public channel transmissive power in base station Download PDFInfo
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- CN1780171A CN1780171A CN 200410096266 CN200410096266A CN1780171A CN 1780171 A CN1780171 A CN 1780171A CN 200410096266 CN200410096266 CN 200410096266 CN 200410096266 A CN200410096266 A CN 200410096266A CN 1780171 A CN1780171 A CN 1780171A
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Abstract
A method for controlling the emitting power of public channels at base stating includes such steps as detecting the down load of network, comparing it with preset threshold, and regulating the emitting power if the result meets the power regulation conditions.
Description
Technical field
The present invention relates to the control method of channel emission power in the mobile communication, be used for the control method of public channel transmissive power in base station in especially a kind of 3G (Third Generation) Moblie network.
Background technology
In present mobile communications network, wireless channel comprises two parts, common signal channel and Traffic Channels.Wideband Code Division Multiple Access (WCDMA) (WCDMA) with the third generation is an example, and common signal channel comprises: Common Pilot Channel (CPCICH), primary synchronization channel (P-SCH), from synchronizing channel (S-SCH), Common Control Channel (CCPCH) etc.; Traffic Channel comprises: special-purpose physical traffic channels (DPDCH), Dedicated Physical Control Channel (DPCCH) etc.
Wherein the transmitting power of Traffic Channel is relevant with the number of users of current carrying, and is simultaneously also relevant with type of service (being used to provide the service of the different Q OS service quality and the GOS grade of service).The transmitting power of Traffic Channel is constantly to change, and reduces power when traffic carrying capacity is few, improves power when traffic carrying capacity is big.The transmitting power of common signal channel remains unchanged in the prior art, and in the network planning, the transmitting power of common signal channel generally takies about the 15-25% of its full transmitting power.
Because code division multiple access (CDMA) system is a self-interference system, thereby has cell breath, promptly when customer volume reduces, if base station transmitting power remains unchanged, then its effective coverage range will enlarge.But in the network planning of reality, the Zone switched of each minizone carried out suitable planning according to the network actual conditions, and the expansion of base station range can't bring more benefit to network operation.This situation is apparent in view in the city, in the city or the area of population comparatively dense, the emphasis of the network coverage has not been by enlarging the coverage rate dead zone-eliminating, but by realizing that the degree of depth covers dead zone-eliminating, thereby in most cases, even when traffic carrying capacity is little, the expansion of base station range does not have great role for improving network coverage quality yet.Therefore when traffic carrying capacity is little, can under the prerequisite that continues the original coverage of maintenance, reduces the transmitting power of common signal channel, thereby reduce power consumption, improve environmental protection, prolong the related device life-span.
At present aspect the transmitting power of control channel, for the power control of Traffic Channel fairly perfect algorithm has been arranged, comprise closed power control and open Loop Power control, wherein closed power control comprises that again inner loop power control and exterior ring power control.Up link adopts open Loop Power control and closed power control dual mode, when up link is not set up, open Loop Power control is used for regulating the transmitting power of Physical Random Access Channel, after the link establishment, the control of use closed power, exterior ring power control with the error rate or frame error rate as controlled target, inner loop power control with signal interference ratio as controlled target.Down link has only closed power control.These methods guarantee to allow portable terminal with alap power emission signal, to reduce the interference to other user, the raising capacity under the prerequisite of certain quality of reception.For common signal channel, all adopt fixing transmitting power in the present network, promptly when netinit, set the transmitting power of common signal channel after, unless artificially be provided with again, otherwise will can not control automatically the transmitting power of common signal channel.The transmitting power of common signal channel guarantees the coverage of network to a certain extent on the one hand, on the other hand, present viewpoint thinks that it is less important that the control of public channel transmissive power is compared the effect of improving network quality with the power control of Traffic Channel for the effect of improving network quality, thereby also there is not a kind of method to be used for the power control of common signal channel at present, simultaneously because common signal channel is different from the function of Traffic Channel, its coverage to the base station plays a part crucial, and the coverage of base station should have relative stability and should not carry out conversion fast, so be used for the Poewr control method of Traffic Channel and be not suitable for control to public channel transmissive power.
In the existing network, common signal channel is with fixing power emission, and when traffic carrying capacity is not high, the transmitting power of common signal channel needn't maintain on original higher-wattage, because keeping former power launches and can not bring more beneficial effect to improving network coverage quality, but may strengthen the phase mutual interference of common signal channel between the base station, as produce pilot pollution etc., influenced network quality (in network, switching more frequent situation) as terminal occurring, public channel transmissive power remains unchanged and has consumed the unnecessary energy simultaneously, also is unfavorable for prolonging device lifetime.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method of controlling public channel transmissive power, with the transmitting power of the common signal channel that determines the base station according to the actual requirements, thereby reduces the transmitting power of base station common signal channel generally.
For addressing the above problem, the invention provides a kind of control method of public channel transmissive power in base station, this method specific implementation is:
At first, detect the network down load; Network down load and the threshold value that presets are compared, carry out the condition that power is adjusted, then the transmitting power of common signal channel is carried out adjusting accordingly with the power transfer condition if comparative result satisfies.
Wherein, the detection to the network down load is periodically to detect.
Described Power Conversion condition comprises: reduce the condition of public channel transmissive power and the condition of raising public channel transmissive power; The condition of described reduction public channel transmissive power is that measurement result is not more than the threshold value that reduces current transmit power; The condition of described raising public channel transmissive power is that measurement result is greater than the load-threshold value that improves current transmit power.
Compared with prior art, the beneficial effect that the present invention brings is: because a kind of control method of public channel transmissive power provided by the present invention, this method is a foundation with the actual loading situation of network, by the transmitting power of certain algorithm decision base station common signal channel.Compare with existing network, this method makes can be under the prerequisite that guarantees network communication quality, the transmitting power of suitable reduction base station common signal channel, avoid the phase mutual interference that causes increasing common signal channel between the base station owing to public channel transmissive power is excessive, improved the performance of network to a certain extent, simultaneously because the transmitting power of common signal channel only is to satisfy the required lowest transmit power of network communication quality, thereby reached the effect that reduces power consumption, and the reduction of public channel transmissive power helps the useful life of device in the prolongation equipment.
Description of drawings
Fig. 1 is the specific embodiment flow chart according to this method.
Embodiment
The invention provides a kind of control method of public channel transmissive power in base station.In this method, at first need to define the state of the different transmitting power of the corresponding common signal channel of difference.
Following elder generation is that example is carried out specific description to the present invention with the situation that has defined two states.
The two states of base station is defined as operating conditions and sleep state respectively.The operating state of base station when operating conditions represents offered load big, this moment, the common signal channel of base station was launched with full power; Sleep state is represented the operating state of hour base station of offered load, and this moment, the common signal channel of base station was launched with the lower power that allows.
For the conversion of two states, set common signal channel that a threshold value is used to judge whether network condition allow the base station by a kind of transmit power transition to another kind of transmitting power.Getting of threshold value is to decide according to the network concrete condition surely, can select the criteria for classifying of the value of a suitable load as two states according to the situation of change of offered load.Getting threshold value in the present embodiment is 20%, think that promptly offered load was greater than or equal at 20% o'clock, network is in the bigger situation of load, and the transmitting power the when common signal channel of this moment should be with operating conditions is launched, otherwise the transmitting power of common signal channel should select sleep state the time launched.The selection of threshold value has been played conclusive effect for each operating state, should note satisfying 2 requirements when the selection of threshold value: real network had the most of the time in one day offered load maintains in one or several scope as far as possible, therefore selected threshold value should be within reason near these scopes, to avoid making the frequent conversion of appearance between different conditions as far as possible; The selection of threshold value should make the transmitting power of base station common signal channel reduce under the prerequisite that does not influence network quality as far as possible.
The working method of method provided by the present invention is specially, and current working state is set to operating conditions during initialization for the first time in the base station, promptly Ci Shi common signal channel should be with offered load power greatly the time launch.Whether the process that picks up counting or count, the testing process that is used for monitoring conversion reach is detected duration desired detection time.The base station begins to detect offered load, and the base station can be intermittent to the detection of offered load, recommend to adopt periodic the detection in this method, and the sense cycle value is less than the detection duration that presets.Each base station is about to measured value and compares with the change-over gate limit value that presets after finishing detection to offered load.Judge current base station is carried out work with which kind of state, if this moment, initialization was just carried out in the base station, then the work at present state is an operating conditions, otherwise the work at present state may pass through conversion, may also may be sleep state for operating conditions.
Suppose that the work at present state in this example is an operating conditions, the offered load and the switching threshold that measure are compared, if the load that measures is more than or equal to the threshold value 20% that presets, the offered load that be described this moment is bigger, transmitting power when the base station should keep present operating conditions is launched common signal channel, then should restart timing or counting, and wait for that the offered load value of next time measuring compares judgement again.If the load value that measures is less than or equal to the threshold value 20% that presets, then explanation offered load this moment is less, thereby has the possibility that the work at present state is transformed into sleep state from operating conditions.Consider that the demand that causes carrying out state exchange this moment because of offered load diminishes may be a situation of short duration or accidental burst, might just change the back with regard to owing to the demand that does not satisfy network communication quality has to state is changed once more at the state of base station, thereby, for fear of the frequent transitions of state, judge whether to satisfy the requirement that detects duration.If do not reach the detection duration that presets, explanation need be according to the current load condition of network to whether the needs transition status is proceeded to judge, then should continue the process of timing or counting, and wait for that the offered load value of next time measuring is in order to judge whether the still condition of match state conversion; If reached or exceeded the detection duration this moment, supervision through after a while then is described, is not accidental the burst with the base station operating state from the demand that operating conditions is transformed into sleep state, then the work at present state should be converted to sleep state from operating conditions this moment, the transmitting power that is about to common signal channel reduces, restart timing or counting process simultaneously, be used to monitor the transfer process that the work at present state is transformed into operating conditions from sleep state.Totally see, the purpose of this step is: only in detecting duration, the result of the offered load that measures and the state exchange threshold value comparison of presetting just carries out state exchange when satisfying switch condition all the time, otherwise should proceed to judge to whether satisfying the condition that state transforms.
Fig. 1 has described the flow chart of control public channel transmissive power in base station method of the present invention when having defined two states, corresponding to Fig. 1, specific implementation of the present invention is: step 10 is for presetting two transmitting powers of common signal channel, definition is respectively operating conditions and sleep state corresponding to the operating state of the base station of these two transmitting powers, step 11 is initialized as operating conditions with the base station, step 12 is provided with and detects duration is T, carry out step 13, beginning periodically detects offered load L, sense cycle is P, after detection obtains offered load L, carry out step 14, judge which kind of state is current base station work in, suppose that work at present state in base station is an operating conditions, then carry out step 15, judge that whether the offered load that measures is less than the threshold value 20% that presets, if offered load is not less than 20%, then return step 12, reset and detect duration, if offered load is less than 20%, then carry out step 16, it is last time to detect the poor of duration value and sense cycle that the currency that detects duration is set, and carry out step 17, judges that whether current detection duration is smaller or equal to zero, if detect the duration currency smaller or equal to zero, then carry out step 18, operating conditions is converted to sleep state, and return step 12, reset and detect duration, be not less than zero if detect the duration currency, then explanation needs to continue to judge whether needing to carry out state exchange, then returns step 13, continue to detect offered load, and keep current detection duration value.In specific embodiment shown in Figure 1, same with judging whether minus method reaches the purpose whether the supervision transfer process satisfies the requirement of detection duration to the current detection duration value, can utilize the method that presets timer to reach identical purpose.
Should be understood that, being transformed into sleep state from operating conditions can be different with the value that presets duration that is transformed into operating conditions from sleep state, be transformed into short slightly that the value that presets duration of operating conditions can be provided with from sleep state, this is because communication network needs to satisfy constantly the needs of service, when the load in the network improves, the base station should still can guarantee covering quality preferably, thereby the weak point that presets the duration setting that will be from the sleep state to the operating conditions some can be made a response to the increase of offered load timely in the base station, the transmitting power that improves common signal channel is to satisfy the demand of network communication quality.
Realize specific embodiments of the invention when more than having introduced the definition two states, method of the present invention can be applied to preset the situation of common signal channel different transmission power more than three kinds and three kinds equally.
The definition base station can work in A, B respectively, three kinds of states of C adopt different transmitting powers corresponding to common signal channel.Wherein, A is the state of offered load base station common signal channel full power emission when maximum, and C is the state of offered load base station low power transmissions when low, and B is the state between between A and C state.Presetting the threshold value that satisfies to state A conversion is 50%, is 20% to the threshold value of state C conversion, and then 20% between 50% the time, the base station should work in state B.
If this moment, the base station was operated in state B, recording offered load is 40%, illustrate that the operating state of current base station can satisfy the demand of network quality, should keep the work at present state constant, then be used for the timer reclocking of monitored state conversion, and wait for that the next offered load of measuring is to judge whether carrying out state exchange.If the offered load that records for the first time is 55%, with the comparison of threshold value greater than threshold value 50% to state A conversion, the transmitting power of common signal channel should be improved in comparative result explanation base station, operating state should be transformed into A by B, should continue the timing of timer this moment, and wait for judged result next time.If the offered load of new one-shot measurement is not more than and equals 50% behind the one-period of interval, illustrate that the offered load that last time measured is accidental value, in this case, might maintain between 20% to 50% by measured value, also the load that may measure is less than 20%, though also can think the condition that has satisfied state exchange less than 20%, but with more resulting result last time is different, be that judged result is to change to the state of different directions, thereby how many loads that no matter measures is, different with the result who last time compared as long as (promptly are not more than and equal 50%), just should be with the timer reclocking, and wait for that the offered load of next time measuring is to judge whether carrying out state exchange.If the offered load of new one-shot measurement is still greater than 50% behind the one-period of interval, then timer continues timing, when arriving or surpass the detection duration, the offered load that measures is all the time greater than 50%, then the operating state with the base station is transformed into A by B, and the timer reclocking begins to judge whether the operating state of base station needs from A to other state exchanges.
When the operating state of base station is defined as three or three when above, for the conversion of state can only investigate whether satisfy to the switch condition of current state adjacent states.With the foregoing description is example, when the work at present state is A, only judges whether to satisfy the condition of state to the B conversion; Or the work at present state only judges whether to satisfy the condition of state to the B conversion when being C; When the work at present state is B, judge whether to satisfy condition to state A or state C conversion.
Equally, in the judgement of carrying out state exchange, the threshold value of each state can be compared respectively with detecting the offered load that obtains, can be provided with a plurality of timers this moment, monitors respectively by the process of current state to other each state exchanges.If when being current state C, respectively whether the monitoring network load state satisfies the condition to state B or state A conversion, if when going out present condition B and state A and can change simultaneously, selection mode A changes.Promptly recommend in the present embodiment to select to change apart from the work at present state state that satisfies switch condition farthest.Equally, also can regulation select to change, perhaps in a plurality of states that can change, select one change apart from the nearer state of operating state at present.This processing method can increase the complexity of system's computing, but its benefit is when offered load improves, and can make a response more timely, and the transmitting power that improves common signal channel is to guarantee the communication quality of network.
In the foregoing description, by a detection duration that presets, the too frequent variation of transmitting power has been avoided in the adjustment of control public channel transmissive power, by two-door limit value is set in the judgement of state exchange, also can reach identical purpose.For example: common signal channel emission state A and B, the transmitting power of A condition is less than the transmitting power of B state, preset by state A to the threshold value of state B conversion with by the threshold value of state B to state A conversion, and aforementioned threshold value is higher than latter's threshold value, has only the offered load of working as greater than the former threshold value, just allow the common signal channel emission state to turn to B, have only, just allow the common signal channel emission state to turn to A by B when offered load during less than latter's thresholding by A.By this frequent switching that can avoid equally between state is set.
The invention provides a kind of control method of public channel transmissive power in base station, can suitably reduce the transmitting power of base station common signal channel when network traffic reduces, i.e. the degree of public channel transmissive power reduction will be according to the actual conditions decision of offered load.Advise a kind of method herein, can be used for reference to selecting suitable state exchange threshold value.
The down link budget formula is:
PL_DL＝Pout_BS-Lc_BS-Lf_BS+Ga_BS+Ga_UE-Mf-MI-Lp-Lb-S_UE
Wherein:
PL_DL is the loss of down link maximum propagation; Pout_BS is the down channel maximum transmission power; Lc_BS is mixer loss in the base station; Lf_BS is a feeder loss; Ga_BS is a bs antenna gain; Ga_UE is the mobile portable antennas gain; Mf is shadow fading surplus (relevant with communication environments); MI is interference margins (relevant with the system design capacity); Lp is building penetration loss when covering (requires indoor use); Lb is the human body loss; S_UE is mobile station receiver sensitivity.Cdma system is the self-interference system, shows as the introducing of interference margins in link budget, and for reverse link, the interference that different load levels is corresponding different is risen.For forward link, the relation of load and interference is more than up complexity, and relation need be determined by emulation accurately, but in order to make system and algorithm simple, can use inverse relationship and add a side-play amount.So descending interference margins can be reduced to:
MI＝10lg(1/(1-LoadR))+Noffset
Wherein:
Noffset is the interference offset amount, and this side-play amount can dispose to system by number pipe platform according to the test result under the concrete environment.LoadR: be down load, define this load and be:
LoadR＝Wc/Wb，
Wherein:
Wc represents this carrier frequency sector current transmit power, and Wb represents carrier frequency sector maximum transmission power.
Can obtain by the link budget formula:
Pout_BS＝PL_DL+Lc_BS+Lf_BS-Ga_BS-Ga_UE+Mf+MI+Lp+Lb+S_UE
Keeping under the constant prerequisite of cell coverage area, because the reduction of disturbing, the channel emission power that can reduce is:
ΔPout_BS＝ΔMI＝10lg(1/(1-LoadR_high))-10lg(1/(1-LoadR_low))＝10lg((1-LoadR_low)/(1-LoadR_high)) (1)
Wherein:
LoadR_high represents system's busy hour load, and is typical in system's heavy traffic period load.
LoadR_low represents system's load during the free time, and is typical in the system load at night.
Public channel transmissive power in base station can determine low amount according to formula (1).
More than method provided by the present invention has been carried out detailed argumentation.It should be understood that described only with the signal mode provided detailed description and instantiation.For one of ordinary skill in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some kinds to native system and improve or modification, these improvement or modification all should be considered as belonging to protection scope of the present invention.
Claims (7)
1, a kind of control method of public channel transmissive power in base station is characterized in that:
1) detects the network down load;
2) threshold value and the network down load that presets compared, carry out the condition that power is adjusted, then carry out step 3) if comparative result satisfies;
3) transmitting power of common signal channel is carried out adjusting accordingly with the power transfer condition.
2, the control method of public channel transmissive power in base station as claimed in claim 1 is characterized in that: the described detection of step 1) is for periodically detecting.
3, the control method of public channel transmissive power in base station as claimed in claim 1 or 2 is characterized in that: described public channel transmissive power comprises the initialized maximum transmission power of common signal channel.
4, the control method of public channel transmissive power in base station as claimed in claim 1 is characterized in that, the Power Conversion condition described in the step 3) comprises: reduce the condition of public channel transmissive power and the condition of raising public channel transmissive power; The condition of described reduction public channel transmissive power is that measurement result is not more than the threshold value that reduces current transmit power; The condition of described raising public channel transmissive power is that measurement result is greater than the load-threshold value that improves current transmit power.
5, the control method of public channel transmissive power in base station as claimed in claim 1 is characterized in that: step 2) in also comprise step:
21) whether judge comparative result with last time comparative result was identical, then carry out step 22) as if identical;
22) judge whether the timing preset timer arrives the detection duration that presets, if, then timer reclocking and carry out step 3), otherwise continue the timing of timer.
6, the control method of public channel transmissive power in base station as claimed in claim 5 is characterized in that: the testing process during for the common signal channel different transmission power, preset different detection durations.
7, the control method of public channel transmissive power in base station as claimed in claim 1 is characterized in that: the described detection of step 1) is periodically detection, and sense cycle is less than described detection duration.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101959292A (en) * | 2009-07-20 | 2011-01-26 | 华为技术有限公司 | Method, equipment and system for saving energy for base station |
| CN102196549A (en) * | 2010-03-19 | 2011-09-21 | 中兴通讯股份有限公司 | Method and system for controlling power of common channel |
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| JP3660690B2 (en) * | 1996-06-27 | 2005-06-15 | 株式会社エヌ・ティ・ティ・ドコモ | Transmission power control device |
| CN1146169C (en) * | 2000-11-28 | 2004-04-14 | 华为技术有限公司 | Method and control system for balancing loads between common frequency small regions in CDMA communication system |
| CN1275404C (en) * | 2001-07-12 | 2006-09-13 | 中兴通讯股份有限公司 | Method for setting up initial down transmitting power according to circuit switch service |
| WO2003036815A1 (en) * | 2001-10-22 | 2003-05-01 | Nokia Corporation | Pilot channel power autotuning |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101959292A (en) * | 2009-07-20 | 2011-01-26 | 华为技术有限公司 | Method, equipment and system for saving energy for base station |
| CN102196549A (en) * | 2010-03-19 | 2011-09-21 | 中兴通讯股份有限公司 | Method and system for controlling power of common channel |
| CN102196549B (en) * | 2010-03-19 | 2015-04-01 | 中兴通讯股份有限公司 | Method and system for controlling power of common channel |
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Effective date of registration: 20200903 Address after: 518000 Baoan District Xin'an street, Shenzhen, Guangdong, No. 625, No. 625, Nuo platinum Plaza, Patentee after: SHENZHEN SHANGGE INTELLECTUAL PROPERTY SERVICE Co.,Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd. Effective date of registration: 20200903 Address after: No.23, Zhaoyang West Village, Xinghua City, Taizhou City, Jiangsu Province Patentee after: Wang Yunyun Address before: 518000 Baoan District Xin'an street, Shenzhen, Guangdong, No. 625, No. 625, Nuo platinum Plaza, Patentee before: SHENZHEN SHANGGE INTELLECTUAL PROPERTY SERVICE Co.,Ltd. |
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