CN101072054B - Downlink power control method for time division synchrous CDMA system - Google Patents
Downlink power control method for time division synchrous CDMA system Download PDFInfo
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Abstract
The method includes steps: determining the starting time of UE up going synchronization (Sync), and time of receiving UE generated control command word (CCW) for down going power, as well as time interval between the two times; if the time interval is smaller than down going Sync detection time (DGSD), then down going power of Node B is not adjusted; if the time interval is larger than or equal to DGSD, then down going power of Node B is adjusted; sending up going Sync test command sequence and confirming condition of down going Sync of UE again in order to prevent UE from not obtaining down going Sync within DGSD. In addition, when wireless link is out of Sync, the method generates corresponding power CCW based on SNR_Target of UE. The invention can reduce and prevent downgoing power of Node B from misadjustment, is in favor of fast convergence of power control, as well as reduces down going interference on source sector and other adjacent sectors in cofrequency.
Description
Technical field
The present invention relates to the mobile communication technology field, the method for controlling downlink power of particularly a kind of TD SDMA (TD-SCDMA, Time Division-Synchronous Code Division Multiple Access) system.
Background technology
In communication process, be recurrent with switching frequently, because frequency spectrum resource is rare, identical networking also is inevitable.And in the frequency handoff procedure,, can improve the Interference Signal Code Power (ISCP, Interference Signal CodePower) of homogeneous frequency adjacent area rapidly if the control of the descending power of cell-of-origin is improper, influence the communication quality of neighbor cell; Homogeneous frequency adjacent area can improve the descending power of base station (NodeB) at descending target signal to noise ratio (SNR_Target, Signal to Noise Ratio_Target) in the time of can not meeting the demands, cause the raising of the descending ISCP of cell-of-origin.So mutual deterioration; Subscriber equipment (the UE that will cause two sub-districts; User Equipment) perhaps can not receive with the frequency switching command, perhaps can not obtain downlink synchronous signal, make switching cannot successfully carry out or quality of handoff decline; Descending interference in therefore effective reduction system is for being even more important with switching frequently.Radio Link is in initial condition when switching with frequency; The SNR that UE receives is uncertain; As SNR during,, will cause the descending power toning of NodeB if UE still produces rise (UP) power control command word greater than SNR_Target; Be unfavorable for the quick convergence of power control, the descending interference that also can increase cell-of-origin and neighbor cell simultaneously.In the communication process of reality; Because factors such as ecological deterioration; Radio Link step loss condition occurs through regular meeting, if the descending power of cell-of-origin control at this moment is improper, in the descending ISCP that improves the cell-of-origin; Can improve the descending ISCP of adjacent co-frequency cell rapidly, and then influence the communication quality of neighbor cell.
In view of the above problems, present TD-SCDMA system adopts the descending power of following method control base station:
During Node B uplink loss, do not send descending power, obtain the descending power of redispatching after the uplink synchronous, the descending power of Node B control simultaneously gets into the closed loop adjusting stage, need satisfy during adjustment that power difference is no more than 12db between descending code channel;
According to 3GPP TS 25.224 agreements, UE sends the UP power control command word to Node B when its descending step-out, sends the corresponding downstream power control command word according to its descending SNR_Target to Node B again after the UE down-going synchronous.
When Radio Link had just been set up, it was in initial condition, and this moment, UE began the downlink synchronization status detection.Synchronous in order to obtain air interface (UU mouth) fast; Initially be established to from Radio Link and get into for the first time synchronous regime; The UE physical layer is the synchronization primitives of cycle detection Radio Link with 160ms; After detecting the synchronization primitives of the individual Radio Link of maximum times (N312) in the timing (T312) of UE timer of its startup when Radio Link is just set up, think that just down link gets into synchronous regime.After Radio Link gets into synchronous regime; It is the step-out primitive of cycle detection Radio Link that the UE physical layer continues with 160ms; Be consecutively detected the step-out primitive of the individual Radio Link of maximum times (N313) as UE after, just think that down link gets into desynchronizing state, it is the timer of T313 that UE starts timing; When UE after the T313 monitoring in time is subsynchronous to maximum times (N315), just think downlink synchronization.So no matter Radio Link is in initial condition or connection status; The capital is lost and is walked out of at present; In case and step-out UE just needs the regular hour to detect synchronously; The control of the descending power of Node B has got into the closed loop adjustment during this period, and the descending power control command word that the UE that will cause Node B in a period of time, to receive like this produces all is UP.That is to say, before the UE down-going synchronous, if the descending power control command word of Node B response UE; Be bound to cause the mistuning of Node B descending power; Not only be unfavorable for the quick convergence of power control, and since between descending code channel power difference can not surpass 12db, the descending power of other UE also can improve suddenly in Node B responds the identical time slot of descending power control command word of UE; Promptly cause the descending interference in cell-of-origin to strengthen; More cause the descending ISCP of adjacent co-frequency cell to raise rapidly, cause neighbor cell user's channel quality variation, cell update (cell_update) can take place in UE when serious.
For example, as shown in Figure 1, being four UE switches to the variable power comparison diagram of Target cell according to known method for controlling downlink power, abscissa express time (unit is a subframe) wherein, and ordinate is represented the downlink transmission power (unit is dbm) of NodeB.The downlink transmission power of Node B all can have a spike when each UE occurred; This spike is owing to the descending power control of UE causes; After the descending power of newly-built UE improves, receive power difference between descending code channel can not surpass the restriction of 12db, the descending power of already present UE also can be along with increase; After the descending power control of all UE all got into normal closed loop adjustment, it is normal that the descending power of four UE just recovers.
Summary of the invention
In view of this, the purpose of this invention is to provide the method for controlling downlink power of a kind of TD-SCDMA system, with solve at present when frequently switching because the mistuning of Node B descending power and the descending interference of TD-SCDMA system, influence the problem of communication quality.
For achieving the above object, the method for controlling downlink power of a kind of TD-SCDMA of the present invention system comprises:
The zero-time (for the unit subframe) of A, Node B record UE uplink synchronous and the time (for the unit subframe) of receiving the descending power control command word that UE produces thereof, and the zero-time of confirming said UE uplink synchronous and said Node B receive the time interval between time of descending power control command word of UE generation;
B, when the said time interval less than the down-going synchronous of UE during detection time, Node B does not adjust its descending power; When said interval greater than or the down-going synchronous that equals UE during detection time, Node B adjusts its descending power according to said descending power control command word.
Further, RNC disposes the B to Node with the N312 that said UE uses; It is long-pending with said N312 that the down-going synchronous of said UE is that UE detects the subframe that the cycle transformed (Period) of its down-going synchronous detection time, and promptly down-going synchronous detection time is Period * N312.
Wherein, when RNC can't dispose said N312 to Node B, the said N312 of Node B was set to a constant, for example is defaulted as 1.
Further, this method comprises: NodeB starts timer and in the timing of said timer, sends uplink synchronous test command sequence to said UE.
Wherein, said Node B adjusts its descending power according to following step:
Node B is recorded in the peak of the up-converter channel impact responding of the said UE that receives when it begins to respond said descending power control command word;
Node B monitors and is recorded in the peak of said uplink synchronous test command sequence to UE instantaneous up-converter channel impact responding of UE between action period in the timing of said timer;
Whether Node B monitors the up-converter channel impact responding of said UE in the timing of said timer the absolute value of difference of peak is greater than or equal to the uplink synchronous test command sequence adjustment thresholding of said UE; If descending power control and the uplink synchronous of then said Node B get into the closed loop adjusting stage; Otherwise said Node B judges whether said timer is overtime.
Wherein, if said timer expiry, then said Node B returns to its initial transmission power with its descending power, and restarts said timer; If said timer is not overtime, then said Node B sends uplink synchronous test command sequence to said UE again.
Preferably; The timing of said timer is the unit subframe; And be the synchronous adjustment step-length (SS_Step of 1 chip (1chip) time and UE; Synchronization Shuffling_Step) merchant's of required time integer part, promptly timing is
.
Preferably, said uplink synchronous test command sequence confirms that by synchronous adjustment target (SS_Target, the Synchronization Shuffling_Target) position of said UE uplink synchronous it can be Delay sequence or Advance sequence; For example, when SS_Target was 1/3 window length, said uplink synchronous test command sequence was the Delay sequence.
Preferably, the uplink synchronous test command sequence of said UE adjustment thresholding is SS_Step long-pending half the of timing and the said UE of said timer, and promptly to adjust thresholding be timing * SS_Step/2 to uplink synchronous test command sequence.
For achieving the above object; The method for controlling downlink power of a kind of TD-SCDMA of the present invention system; Comprise: UE is when radio link failure; Said UE produces the corresponding downstream power control command word according to its SNR_Target, and what wherein said SNR_Target can be among signal interference ratio (SIR, Signalto Interference Ratio) or the SNR after the joint-detection of said combined U E before detecting is a kind of.
Wherein, when the current SNR of said UE was greater than or equal to said SNR_Target, said UE produced downward modulation (Down) power control command word; When the current SNR of said UE did not have the effective reception signal less than said SNR_Target or said UE, said UE produced the UP power control command word.
Can find out by above technical scheme provided by the invention:
When frequently switching together, Node B goes synchronously above that and descending power is controlled in the top n subframe of entering closed loop adjustment, the down-going synchronous detection time of consideration UE, its descending power is carried out suitable adjustment; And UE produces the corresponding downstream power control command word according to its SNR_Target when radio link failure.The method of the invention can reduce and prevent the mistuning of Node B descending power, helps the quick convergence of power control; More can be because of the restriction of difference power between the descending code channel of 12db; And in the identical time slot of the descending power control command word of Node B response UE, the power of other UE is drawn high; Can reduce the descending interference of cell-of-origin, also can reduce descending interference simultaneously adjacent co-frequency cell.
Description of drawings
Fig. 1 is four UE switch to Target cell according to known method for controlling downlink power a variable power comparison diagram;
Fig. 2 is the main flow chart of method for controlling downlink power according to the invention;
Fig. 3 is the flow chart that Node B controls its descending power in the present invention's one preferred embodiment;
Fig. 4 is the state diagram of radio link failure of the present invention.
Embodiment
Basic thought of the present invention is: when frequently switching together, Node B goes synchronously above that and descending power is controlled in the top n subframe of entering closed loop adjustment, the down-going synchronous detection time of consideration UE, its descending power is carried out suitable adjustment; And UE produces the corresponding downstream power control command word according to its SNR_Target when radio link failure.
In with the frequency handoff procedure; After UE switches to Target cell; As shown in Figure 2; At first, get into the zero-time of step 201:Node B record UE uplink synchronous and the time of receiving the descending power control command word that UE produces thereof, and the zero-time of confirming said UE uplink synchronous and said NodeB receive the time interval between time of descending power control command word of UE generation.
Wherein, when said UE did not also begin uplink synchronous, Node B judged whether uplink synchronous of said UE always; Afterwards, Node B writes down the zero-time of said UE uplink synchronous.
When Node B does not also receive the descending power control command word of said UE generation, Node B will judge always whether it receives the descending power control command word that said UE produces; Afterwards, Node B writes down its time of receiving the descending power control command word that said UE produces.
In addition, the zero-time of said UE uplink synchronous and Node B receive the time unit's of being subframe of the descending power control command word that UE produces.
Secondly, the magnitude relationship that gets into down-going synchronous detection time of UE that step 202:Node B judges that the said time interval and the N312 that is used according to UE by Node B confirm.
If said, then get into step 203:Node B and its descending power is adjusted according to said descending power control command word interval greater than the down-going synchronous detection time that perhaps equals said UE.
Wherein, The down-going synchronous that equals said UE when the said time interval is during detection time, and under the reasonable environment of wireless link channel condition, UE should obtain down-going synchronous; Therefore Node B responds said descending power control command word at this moment, will the mistuning probability of Node B descending power be reduced.
If the said time interval then got into step 204:Node B and its descending power is not adjusted less than the down-going synchronous detection time of said UE.
Wherein, be Period * N312 down-going synchronous detection time of said UE, and those skilled in the art should know that this is a unique method of confirming down-going synchronous detection time of UE in the art.
It should be noted that when Node B can't obtain said N312 the said N312 of Node B is set to a constant, for example is defaulted as 1.
In with the frequency handoff procedure, after UE switched to Target cell, UE produced the corresponding downstream power control command word according to its SNR_Target when radio link failure.That is, when the current SNR of said UE was greater than or equal to said SNR_Target, said UE produced the Down power control command word; When the current SNR of said UE did not have the effective reception signal less than said SNR_Target or said UE, said UE produced the UP power control command word.Wherein said SNR_Target is a kind of among SIR or the SNR after the joint-detection before the said UE joint-detection.So just prevented that UE produces the situation of UP power control command word in the prior art when radio link failure always, thereby reduced or prevented the mistuning of Node B descending power.
Further, in the process that Node B adjusts its descending power, mainly comprise the preliminary affirmation of UE down-going synchronous and reaffirm two parts.
Wherein, Preliminary affirmation process is: Node B does not respond the descending power control command word that UE produces in the down-going synchronous of UE in detection time; And hypothesis UE can obtain down-going synchronous in this down-going synchronous in detection time, and Node B respond said descending power control command word after the UE down-going synchronous, with the mistuning of minimizing Node B descending power; Reduce the descending interference of cell-of-origin and adjacent co-frequency cell thereof simultaneously, guarantee the communication quality of neighbor cell.In addition; Compare under the rugged environment in the wireless link channel condition; For the mistuning that makes Node B descending power is reduced to minimum or the mistuning of Node B descending power is not taken place, and make the communication quality of neighbor cell best, be necessary then the down-going synchronous of UE to be reaffirmed.
Before carrying out the reaffirming of said UE down-going synchronous, Node B will start timer and in the timing of said timer, send uplink synchronous test command sequence to said UE.So just can in switching frequently, avoid the existing in prior technology defective maybe this defective to be reduced to minimum as far as possible.
Wherein, the said process of reaffirming specifically comprises: Node B is recorded in the peak of the up-converter channel impact responding of the said UE that receives when it begins to respond said descending power control command word; NodeB monitors and is recorded in the peak of said uplink synchronous test command sequence to UE instantaneous up-converter channel impact responding of UE between action period in the timing of said timer; Whether Node B monitors the up-converter channel impact responding of said UE in the timing of said timer the absolute value of difference of peak is greater than or equal to the uplink synchronous test command sequence adjustment thresholding of said UE; If descending power control and the uplink synchronous of then said Node B get into the closed loop adjusting stage; Otherwise said Node B judges whether said timer is overtime.
Wherein, if said timer expiry, then said Node B returns to its initial transmission power with its descending power, and restarts said timer; If said timer is not overtime, then said Node B sends uplink synchronous test command sequence to said UE again.
In addition; The timing of said timer is the unit subframe; Those skilled in the art can confirm the timing of said timer according to various known method; But in order to make with frequently switching better effects if, the timing of the preferred timer of the present invention is
.In like manner; Those skilled in the art can confirm the uplink synchronous test command sequence adjustment thresholding of said UE according to various known method; But in order to make with frequently switching better effects if, the uplink synchronous test command sequence adjustment thresholding of the preferred UE of the present invention is the timing * SS_Step/2 of said timer.
In addition, said uplink synchronous test command sequence confirms that by the SS_Target position of said UE uplink synchronous it can be Delay sequence or Advance sequence; For example, when SS_Target was 1/3 window length, said uplink synchronous test command sequence was the Delay sequence.
In order to make those skilled in the art person understand technical scheme of the present invention better, the present invention is done further detailed description below in conjunction with accompanying drawing and preferred embodiments.
Fig. 3 shows the flow process that Node B controls its descending power in the present invention's one preferred embodiment.With reference to Fig. 3, when UE switches to Target cell, get into step 301:RNC with Radio Link handover information notice Node B.
To switch to after N312 that the UE of Target cell uses disposes to Node B at RNC, and get into step 302:Node B and confirm down-going synchronous Ninvar detection time of said UE, wherein Ninvar=Period * N312 according to said N312.
In addition, in the present embodiment, when RNC can't dispose said N312 to Node B, the said N312 of NodeB was set to 1.But suppose that here RNC can dispose said N312 to NodeB.
Then Node B confirms the zero-time T1 (for the unit subframe) of said UE uplink synchronous, specifically gets into step 303:Node B and judges whether said UE begins uplink synchronous.
If said UE begins uplink synchronous, the zero-time T1 when then getting into step 304:Node B and writing down said UE uplink synchronous.
If said UE does not also begin uplink synchronous, then continue to get into step 303:Node B and judge whether said UE begins uplink synchronous.
Afterwards, Node B confirms its time T 2 of receiving the descending power control command word that UE produces (for the unit subframe), specifically gets into step 305:Node B and judges whether it receives the descending power control command word that said UE produces.
If Node B receives said descending power control command word, it receives the time T 2 of said descending power control command word then to get into step 306:Node B record; And definite time interval Δ T=T2-T1.
If Node B does not also receive said descending power control command word, then continue to get into step 305:Node B and judge whether it receives said descending power control command word.
Step 307:Node B judges the magnitude relationship of said time interval Δ T and said down-going synchronous Ninvar detection time.
If said time interval Δ T is greater than or equal to said down-going synchronous Ninvar detection time; Explain that said UE has obtained down-going synchronous; Get into step 308:Node B and respond said descending power control command word, and be recorded in the peak PEAK_BEGIN of the up-converter channel impact responding of the said UE that receives when it begins to respond said descending power control command word.
Wherein, the purpose of this step is for tentatively confirming the down-going synchronous situation of UE to reduce the mistuning of NodeB descending power.
If said time interval Δ T less than said down-going synchronous Ninvar detection time, explains that said UE does not also obtain down-going synchronous, get into step 309:Node B and its descending power is not adjusted, to prevent that existing defective occurs once more in the prior art.And after executing said step 309, return and get into step 305 again.
Just can guarantee under the reasonable environment of wireless link channel condition that like this Node B just responds the descending power control command word that UE produces after the UE down-going synchronous, solve corresponding defects in the prior art.
Compare under the rugged environment in the wireless link channel condition, fail really to obtain down-going synchronous in detection time in said down-going synchronous, then also need reaffirm the down-going synchronous situation of UE in order to prevent UE.
Therefore, after executing said step 308, then execution in step 310:Node B startup timing is the timer of Tsync.Wherein select the timing of said timer to be in the present embodiment:
Certainly; The ordinary person that definite scheme of the timing of said timer is not limited to
present technique field also can be according to the demand in the practical application, uses other method to confirm the timing of said timer.
Get into step 311:Node B and in the timing Tsync of said timer, send uplink synchronous test command sequence to said UE.
It should be noted that uplink synchronous test command sequence can be according to the difference of the SS_Target position of UE uplink synchronous and different, suppose that in the present embodiment said uplink synchronous test command sequence is the Delay sequence.
Afterwards, get into step 312:Node B and in the timing Tsync of said timer, monitor and be recorded in the peak PEAK_INSTANT of said uplink synchronous test command sequence the instantaneous up-converter channel impact responding of UE UE between action period.
Get into the absolute value delta chip of difference of peak that step 313:Node B confirms the up-converter channel impact responding of UE described in step 312 and the step 308, and judge that the uplink synchronous test command sequence of said Δ chip and UE adjusts the magnitude relationship of thresholding.
Wherein, said Δ chip=|PEAK_INSTANT-PEAK_BEGIN|, and the uplink synchronous test command sequence of said UE adjustment thresholding=Tsync * SS_Step/2.Definite scheme of it should be noted that said thresholding is not limited to Tsync * SS_Step/2, and the ordinary person in present technique field can use other method to confirm said thresholding according to the demand in the practical application.
If said Δ chip is greater than or equal to said thresholding, the descending power control and the uplink synchronous that then get into step 314:Node B get into the closed loop adjusting stage.So just can in switching frequently, avoid the existing in prior technology defective maybe this defective to be reduced to minimum as far as possible.
If said Δ chip less than said thresholding, then gets into step 315:Node B and judges whether said timer is overtime.
If said timer is not overtime, then gets into step 311:Node B again and in the timing Tsync of said timer, send uplink synchronous test command sequence to said UE.
Uplink synchronous test command sequence that it should be noted that this moment possibly change along with the variation of the SS_Target position of UE uplink synchronous; Therefore, though the said uplink synchronous test command sequence of hypothesis is the Delay sequence in the above-mentioned steps 311, the uplink synchronous test command sequence of this moment then possibly be the Advance sequence.
If said timer expiry then gets into step 316:Node B its descending power is returned to its initial transmission power, and get into step 310 again: starts said timer.
So just guaranteed that before the UE down-going synchronous, the descending power of Node B remains initial transmission power always, avoided the mistuning of Node B descending power.
Fig. 4 shows the state diagram of radio link failure; With reference to Fig. 4; At UE from the initial condition of Radio Link transition period to the synchronous regime of Radio Link; And UE from the desynchronizing state of Radio Link to the transition period of the synchronous regime of Radio Link, the present invention all is regarded as step-out with the Radio Link of this transition period.And in the present invention, UE produces the corresponding downstream power control command word according to its SNR_Target when radio link failure.The descending power control command word perseverance that so just can prevent the UE generation that Node B receives in the prior art in a period of time is the defective of UP.
Wherein, when the current SNR of said UE is greater than or equal to said SNR_Target (radio link failure), said UE produces the Down power control command word; When the current SNR of said UE did not have the effective reception signal less than said SNR_Target (being wireless link synchronization) or said UE, said UE produced the UP power control command word.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (6)
1. the method for controlling downlink power of a TDS-CDMA system comprises:
The zero-time of A, base station recording user equipment uplink synchronous and the time of receiving the descending power control command word that subscriber equipment produces thereof, and the time interval between time of descending power control command word of subscriber equipment generation is received in the zero-time of confirming said subscriber equipment uplink synchronous and said base station;
B, when the said time interval less than the down-going synchronous of subscriber equipment during detection time, the base station is not adjusted its descending power; When said interval greater than or the down-going synchronous that equals subscriber equipment during detection time, the base station is adjusted its descending power according to said descending power control command word;
Wherein, said base station comprises its descending power adjustment according to said descending power control command word:
Base station initiated timer also sends uplink synchronous test command sequence to said subscriber equipment in the timing of said timer;
The base station is recorded in the peak of the up-converter channel impact responding of the said subscriber equipment of receiving when it begins to respond said descending power control command word;
The peak of said uplink synchronous test command sequence to subscriber equipment instantaneous up-converter channel impact responding of subscriber equipment between action period monitored and be recorded in the base station in the timing of said timer;
Whether the up-converter channel impact responding of said subscriber equipment is monitored in the base station in the timing of said timer the absolute value of difference of peak is greater than or equal to the uplink synchronous test command sequence adjustment thresholding of said subscriber equipment; If then control of the descending power of said base station and uplink synchronous get into the closed loop adjusting stage; Otherwise whether the said timer of said base station judges is overtime; If said timer expiry, then said base station returns to its initial transmission power with its descending power, and restarts said timer; If said timer is not overtime, uplink synchronous test command sequence is sent to said subscriber equipment again in then said base station.
2. method for controlling downlink power according to claim 1 is characterized in that,
Radio network controller disposes the maximum times of the synchronization primitives of the Radio Link of said subscriber equipment reception to the base station;
The amassing of maximum times of the synchronization primitives of the down-going synchronous of the said subscriber equipment Radio Link that to be detection time the subscriber equipment subframe that cycle transformed that detects its down-going synchronous receive with said subscriber equipment.
3. method for controlling downlink power according to claim 2; It is characterized in that; When the maximum times of the synchronization primitives of the Radio Link that can't said subscriber equipment be received when radio network controller disposed to the base station, the maximum times of the synchronization primitives of the Radio Link that the said subscriber equipment in base station receives was set to a constant.
4. method for controlling downlink power according to claim 1 is characterized in that, the timing unit of said timer is a subframe, and is merchant's the integer part of the synchronous adjustment step-length required time of 1 chip time and subscriber equipment.
5. method for controlling downlink power according to claim 1 is characterized in that, said uplink synchronous test command sequence is confirmed by the synchronous adjustment target location of said subscriber equipment uplink synchronous.
6. method for controlling downlink power according to claim 1 is characterized in that, the uplink synchronous test command sequence of said subscriber equipment adjustment thresholding is long-pending half of synchronous adjustment step-length of timing and the said subscriber equipment of said timer.
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| CN101795177B (en) * | 2009-02-04 | 2016-05-18 | 电信科学技术研究院 | A kind of retransmission confirmation information feedback method, system and equipment |
| CN102238711B (en) * | 2010-04-20 | 2014-11-26 | 鼎桥通信技术有限公司 | Method and system for controlling downlink transmission |
| JP4927982B1 (en) * | 2010-10-20 | 2012-05-09 | 株式会社エヌ・ティ・ティ・ドコモ | Mobile communication method and radio base station |
| CN102843760B (en) * | 2011-06-24 | 2015-09-16 | 普天信息技术研究院有限公司 | Downlink power distributing method in a kind of LTE system |
| TWI461080B (en) * | 2012-05-15 | 2014-11-11 | Inst Information Industry | Network station power adjustment apparatus and power adjustment method thereof |
| JP6419817B2 (en) | 2013-11-27 | 2018-11-07 | テレフオンアクチーボラゲット エルエム エリクソン（パブル） | NETWORK NODE, WIRELESS DEVICE AND METHOD THEREOF FOR TRANSMITTING AND DETECTING SYNC SIGNALS AND RELATED INFORMATION |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1193430A (en) * | 1996-04-12 | 1998-09-16 | Ntt移动通信网株式会社 | Method and instrument for measuring receiving SIR and transmission power controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193430A (en) * | 1996-04-12 | 1998-09-16 | Ntt移动通信网株式会社 | Method and instrument for measuring receiving SIR and transmission power controller |
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