CN100407592C - Back interference conquering method and system - Google Patents
Back interference conquering method and system Download PDFInfo
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- CN100407592C CN100407592C CN2005101275360A CN200510127536A CN100407592C CN 100407592 C CN100407592 C CN 100407592C CN 2005101275360 A CN2005101275360 A CN 2005101275360A CN 200510127536 A CN200510127536 A CN 200510127536A CN 100407592 C CN100407592 C CN 100407592C
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Abstract
The present invention discloses a method and a system for conquering reverse interference. The method of the present invention comprises the steps that the interference intensity of a reverse link of a mobile terminal is obtained, and a corresponding power adjustment value is determined according to the interference intensity; the power adjustment value is transmitted to the mobile terminal, and the mobile terminal adjusts the transmitting power of the mobile terminal according to the power adjustment value. The system of the present invention comprises an interference intensity obtaining device, a power adjustment value determining device and a power adjustment value transmitting device. The present invention can change the transmitting power of the present invention in real time through the mobile terminal according to the interference intensity of the reverse link of the mobile terminal so as to adjust the signal to noise ratio of an actual network signal and actively conquer the reverse interference.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of back interference conquering method and system.
Background technology
Cdma system belongs to interference limiting system, and external interference will cause power system capacity to reduce, and covers and reduces, and inserts difficulty.For the wireless environment of reality, because the finiteness of available frequency band, owing to some illegal frequency range users' existence, disturbing existence is a unavoidable problem simultaneously.
CDMA2000 1x system provides reverse open Loop Power control algorithm and back closed loop power control algorithm at present, and under access state, mobile phone adopts the transmitting power of open Loop Power control algorithm estimation oneself.
Concrete open Loop Power control algorithm is as follows:
Transmit?Power(dBm)＝-Mean?Receive?Power(dBm)+offset?power+RL_GAIN_ADJs+ACC_CORRECTIONS+interference?correction
Wherein:
Mean Receive Power (dBm): mobile phone received power;
Offset power: fixing value, different radio configuration (Radio Configuration, RC), the diversity of protocol versions portable terminal is to there being different values;
RL_GAIN_ADJs: the inversed business channel power biasing, be used for service condition, be provided with according to the current network situation;
ACC_CORRECTIONS：NOM_PWR-16×NOM_PWR_EXT+INIT_PWR+PWR_LVL×PWR_STEP；
The power that NOM_PWR is relevant with the base station is worth partially, adjusts according to the network concrete condition;
The initial power that INIT_PWR is relevant with portable terminal is worth partially, adjusts according to the network concrete condition;
NOM_PWR_EXT, the secondary power relevant with the base station is worth partially, is generally 0;
PWR_LVL open Loop Power control power ascension number of times is adjusted according to the network concrete condition;
PWR_STEP open Loop Power control power ascension step-length is adjusted according to the network concrete condition.
Interference correction: forward direction covers correction factor, and portable terminal is adjusted according to signal to noise ratio Ec/Io coverage condition oneself, when the Ec/Io of service pilot signal≤-during 14dB, correction value is constant+7; When the Ec/Io of service pilot signal＞-during 7dB, correction value is 0; When the service pilot signal-14dB＜Ec/Io≤-during 7dB, correction value is (7～Ec/Io).
Above-mentioned reverse open Loop Power control algorithm provides an effective back emitted power estimating method, in the good wireless environmental area, this algorithm can effectively estimate suitable back emitted power, has guaranteed access performance and access speed that cdma mobile terminal is good.
For the zone that has reverse interference, will there be following problem in present CDMA open Loop Power control algorithm:
1, in open Loop Power control, portable terminal can't be known the disturbed condition of reverse link, this carries out access attempts with regard to the means that make portable terminal to adopt progressively to improve power, and trial repeatedly inserts and will cause increase average turn-on time, and the user is difficult to stand.
If 2 portable terminal positions are positioned near the base station, its received power is very high, can reach-40dBm, in this case, comprehensive average estimation power output can be very low, because the access step-length that trial improves is limited, it is limited to cause mobile terminal power to promote simultaneously, exist under the larger interference situation, will directly cause the portable terminal can't access network.
Therefore, have the zone of disturbing, because above-mentioned open Loop Power control algorithm does not provide the correction to the interference of reverse link, this just makes in the zone that has interference, can not accurately estimate the transmitting power of portable terminal.
Summary of the invention
The invention provides a kind of back interference conquering method and system, can not adjust the problem of its transmitting power according to the variation of reverse interference in order to solve the portable terminal that exists in the prior art.
The present invention includes:
A, base station BTS obtain the interference strength of mobile terminal backward link, and report base station controller BSC;
B, described BSC determine corresponding power adjustment according to the described interference strength that reports;
C, described BSC send to described portable terminal with described power adjustment;
D, described portable terminal are adjusted the transmitting power of self according to described power adjustment.
Described steps A comprises: the reverse signal intensity indicating RSSI value of base station BTS period measurement mobile terminal backward link, and reporting base station controller BSC;
Described step B comprises: BSC determines described power adjustment according to the RSSI value that reports.
According to said method of the present invention, among the described step B, if the described power adjustment of determining then continues step C in the preset threshold scope; Otherwise, go to steps A.
According to said method of the present invention, among the described step C, described power adjustment is notified described portable terminal by BSC by system message.
According to said method of the present invention, BSC makes INIT_PWR value and NOM_PWR value sum equal described power adjustment according to reverse power control transmitting power initial value INIT_PWR and bias power NOM_PWR in the described power adjustment modification system message of determining.
Described step D comprises: portable terminal calculates capability correction value in the open Loop Power control algorithm according to the described INIT_PWR value that receives and NOM_PWR value, adjusts the transmitting power of self.
According to said method of the present invention, be applied to CDMA systems.
The invention provides a kind of reverse interference and overcome system, comprising: interference strength deriving means, power adjustment are determined device and power adjustment dispensing device; Described interference strength deriving means is to realize the corresponding function module that the RSSI value is measured in the base station BTS; Described power adjustment determines that device and power adjustment dispensing device are arranged in the base station controller BSC, or is connected with BSC by interface;
Described interference strength deriving means obtains the RSSI value of mobile terminal backward link, sends to described power adjustment and determines device;
Described power adjustment determines that device determines corresponding power adjustment according to described RSSI value, sends to described power adjustment dispensing device;
Described power adjustment dispensing device sends to described portable terminal with described power adjustment.
BTS reports BSC by the RSSI reporting message with the reverse link rssi measurement value of portable terminal;
Determine that by described power adjustment device receives the rssi measurement value, determines described power adjustment;
By described adjusted value dispensing device the power adjustment of determining is sent to described portable terminal by system message by BTS.
Described power adjustment determines that device comprises computing unit, judging unit and transmitting element;
Described computing unit goes out power adjustment according to the RSSI value of obtaining according to the algorithm computation of setting, and exports to described judging unit;
Whether the described power adjustment of described judgment unit judges is in default scope; If judge described power adjustment in default scope, then described power adjustment exported to described transmitting element; Otherwise, abandon the power adjustment that this calculates;
The described power adjustment that described transmitting element will receive sends to described adjusted value dispensing device.
Beneficial effect of the present invention is as follows:
(1) the present invention obtains the reverse interference intensity of mobile terminal backward link in real time, adopt the algorithm computation of setting to go out power adjustment, and give portable terminal with the power adjustment proactive notification that calculates, change the transmitting power of oneself by portable terminal, thereby adjust the signal to noise ratio of real network signal, realized that reverse interference initiatively overcomes.
(2) the present invention adopts base station (BTS) period measurement and reports reverse signal intensity indication that (ReverseSignal Strength Indication RSSI) gives base station controller (BSC), represents reverse interference intensity by the RSSI value; And calculate power adjustment according to the RSSI value; Made full use of the measuring ability that cdma base station self possesses, realized that simply cost is low.
(3) the present invention uses reverse power control transmitting power initial value and the bias power in the power adjustment modification system message that calculates; After the system message change, portable terminal is handed down to by system message update in the base station; Portable terminal calculates the capability correction value on existing open Loop Power control algorithm, thereby adjusts self transmitting power.Like this, do not need basically portable terminal is carried out increased functionality, carry out the transmitting power adjustment in real time according to current reverse interference intensity, overcome reverse interference in mode cheaply with regard to realizing.
Description of drawings
Fig. 1 is the inventive method flow chart;
Fig. 2 is the inventive method embodiment flow chart;
Fig. 3 is a system configuration schematic diagram of the present invention.
Embodiment
Referring to Fig. 1,, comprise the steps: for the inventive method flow chart
Step S11, obtain the interference strength of mobile terminal backward link;
Step S12, determine corresponding power adjustment according to described interference strength;
Step S13, described power adjustment is sent to described portable terminal;
Step S14, described portable terminal are adjusted the transmitting power of self according to described power adjustment.
Use specific embodiment below, said method of the present invention is described in detail.
As shown in Figure 2, be base station (BTS) period measurement RSSI value, and report base station controller (BSC); BSC calculates power adjustment according to the situation of change of RSSI value, and the flow chart of notice portable terminal change transmitting power, and concrete steps comprise:
Step S21, BTS period measurement RSSI value (concrete method of measurement is a prior art, does not describe in detail), and measurement result reported BSC;
Step S22, BSC calculate power adjustment according to the RSSI value that reports; Concrete computational algorithm can adopt empirical equation or look-up table etc., and the present invention does not limit this; Be exemplified below:
Defined function InterferenceCalculat carries out Interference Estimation:
Reverse_interference_Adust_Power＝InterferenceCalculat(RSSI)
Wherein, Reverse_interference_Adust_Power is the mobile terminal emitting power adjusted value;
The transmitting power adjusted value of InterferenceCalculat (RSSI) expression portable terminal by base station measurement to RSSI calculate;
InterferenceCalculat function calculation process for example is:
InterferenceCalculat＝-(RSSI+100)/1.5；
When adopting RSSI rated output adjusted value, also can determine whether earlier to calculate corresponding power adjustment earlier according to the size of RSSI value; For example: when RSSI value during, represent that respectively reverse interference is very weak, can ignore less than-105dBm or greater than-65dBm; Or reverse interference is very strong, and portable terminal can't access network; In both cases, do not need the transmitting power of portable terminal is adjusted, therefore, can not carry out the calculating of power adjustment;
Step S23, judge that the power adjustment calculate is whether in the scope that sets in advance;
To adopt RSSI value rated output adjusted value is example, is described as follows:
For cdma system, the level of making an uproar is-113dBm/1.2288M at the bottom of the electromagnetism under the normal temperature situation, consider the receiver noise factor of 5dB, so under the normal condition, the monitoring result of RSSI should be-108dBm about, for the influence of system loading, general maximum is no more than 8dB, just-100dBm about; Like this, under the high load capacity situation, if system works is normal, RSSI average level maximum is no more than-100dBm, otherwise, just represent the reverse interference that network exists; For example: when the RSSI value that measure to obtain during, can think that reverse interference is very weak, in this case, can be not the transmitting power of portable terminal not promoted less than-105dBm; According to the algorithm of determining in the last step, the power adjustment of correspondence when calculating RSSI=-105dBm, with this power adjustment as power adjustment scope lower limit of the present invention; If aforementioned calculation Reverse_interference_Adust_Power as a result then abandons this result of calculation less than lower limit, the transmitting power of portable terminal not to be adjusted, flow process goes to step S21;
Because the transmitting power of portable terminal is limited, after interference level acquired a certain degree, it is maximum that mobile terminal emitting power reaches, and no longer continues to improve transmitting power; Define a power adjustment range limit (as 22dBm) in the present invention, if aforementioned calculation as a result Reverse_interference_Adust_Power the transmitting power of portable terminal is not adjusted greater than higher limit yet, flow process goes to step S21;
If aforementioned calculation as a result Reverse_interference_Adust_Power greater than lower limit and less than higher limit, execution in step S24 then;
Step S24, BSC make INIT_PWR value and NOM_PWR value sum equal described power adjustment according to reverse power control transmitting power initial value INIT_PWR and bias power NOM_PWR in the power adjustment modification system message of determining;
Step S25, BTS are handed down to portable terminal with updated system messages;
Step S26, portable terminal calculate capability correction value ACC_CORRECTIONS in the open Loop Power control algorithm according to the INIT_PWR value that receives and NOM_PWR value, adjust the transmitting power of self.
According to said method of the present invention, the present invention also provides a kind of reverse interference to overcome system, as shown in Figure 3, comprising: interference strength deriving means, power adjustment are determined device and power adjustment dispensing device.
The interference strength deriving means is used to obtain the interference strength of mobile terminal backward link, sends to described power adjustment and determines device;
Power adjustment determines that device determines corresponding power adjustment according to described interference strength, sends to described power adjustment dispensing device;
The power adjustment dispensing device sends to described portable terminal with described power adjustment.
Interference strength deriving means of the present invention can be to realize the corresponding function module that the RSSI value is measured among the BTS; Power adjustment determines that device and power adjustment dispensing device can be realized by software, is arranged in the base station controller BSC; Power adjustment determines that device and power adjustment dispensing device also can be realized by hardware, is connected with BSC by interface.Like this, BTS reports BSC by the RSSI reporting message with the reverse link rssi measurement value of portable terminal; Determine that by being arranged at power adjustment among the BSC or that be connected with BSC device receives the rssi measurement value, determines power adjustment; By the adjusted value dispensing device power adjustment of determining is sent to portable terminal by system message by BTS.
Power adjustment of the present invention is determined can also include computing unit, judging unit and transmitting element in the device.Computing unit goes out power adjustment according to the RSSI value of obtaining according to the algorithm computation of setting, and exports to judging unit; Whether the described power adjustment of described judgment unit judges is in default scope; If judge described power adjustment in default scope, then described power adjustment is exported to transmitting element, send to power adjustment dispensing device of the present invention by transmitting element; Otherwise, abandon the power adjustment that this calculates, obtain the interference strength of reverse link again by the interference strength deriving means.
In sum, the present invention is by obtaining the reverse interference intensity of mobile terminal backward link in real time, adopt the algorithm computation of setting to go out power adjustment, and give portable terminal with the power adjustment proactive notification that calculates, change the transmitting power of oneself by portable terminal, thereby adjust the signal to noise ratio of real network signal, realized that reverse interference initiatively overcomes.
In an embodiment of the present invention, the BTS period measurement also reports the RSSI value to BSC, calculates power adjustment according to the RSSI value; Made full use of the measuring ability that cdma base station self possesses, realized that simply cost is low.
The present invention uses reverse power control transmitting power initial value and the bias power in the power adjustment modification system message that calculates; The base station is handed down to portable terminal by system message update with reverse power control transmitting power initial value and bias power; Portable terminal calculates the capability correction value on existing open Loop Power control algorithm, adjust the transmitting power of self.Therefore, the present invention does not need portable terminal is carried out increased functionality basically, carries out the transmitting power adjustment with regard to realizing in real time according to current reverse interference intensity, has overcome reverse interference in mode cheaply.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. a back interference conquering method is characterized in that, comprising:
A, base station BTS obtain the interference strength of mobile terminal backward link, and report base station controller BSC;
B, described BSC determine corresponding power adjustment according to the described interference strength that reports;
C, described BSC send to described portable terminal with described power adjustment;
D, described portable terminal are adjusted the transmitting power of self according to described power adjustment.
2. the method for claim 1 is characterized in that, described steps A comprises: the reverse signal intensity indicating RSSI value of base station BTS period measurement mobile terminal backward link, and reporting base station controller BSC;
Described step B comprises: BSC determines described power adjustment according to the RSSI value that reports.
3. method as claimed in claim 1 or 2 is characterized in that, among the described step B, if the described power adjustment of determining then continues step C in the preset threshold scope; Otherwise, go to steps A.
4. method as claimed in claim 1 or 2 is characterized in that, among the described step C, described power adjustment is notified described portable terminal by BSC by system message.
5. method as claimed in claim 4, it is characterized in that, BSC makes INIT_PWR value and NOM_PWR value sum equal described power adjustment according to reverse power control transmitting power initial value INIT_PWR and bias power NOM_PWR in the described power adjustment modification system message of determining.
6. method as claimed in claim 5 is characterized in that, described step D comprises: portable terminal calculates capability correction value in the open Loop Power control algorithm according to the described INIT_PWR value that receives and NOM_PWR value, adjusts the transmitting power of self.
7. the method for claim 1 is characterized in that, is applied to CDMA systems.
8. a reverse interference overcomes system, it is characterized in that, comprising: interference strength deriving means, power adjustment are determined device and power adjustment dispensing device; Described interference strength deriving means is to realize the corresponding function module that the RSSI value is measured in the base station BTS; Described power adjustment determines that device and power adjustment dispensing device are arranged in the base station controller BSC, or is connected with BSC by interface;
Described interference strength deriving means obtains the RSSI value of mobile terminal backward link, sends to described power adjustment and determines device;
Described power adjustment determines that device determines corresponding power adjustment according to described RSSI value, sends to described power adjustment dispensing device;
Described power adjustment dispensing device sends to described portable terminal with described power adjustment.
9. reverse interference as claimed in claim 8 overcomes system, it is characterized in that, BTS reports BSC by the RSSI reporting message with the reverse link rssi measurement value of portable terminal;
Determine that by described power adjustment device receives the rssi measurement value, determines described power adjustment;
By described adjusted value dispensing device the power adjustment of determining is sent to described portable terminal by system message by BTS.
10. reverse interference as claimed in claim 9 overcomes system, it is characterized in that, described power adjustment determines that device comprises computing unit, judging unit and transmitting element;
Described computing unit goes out power adjustment according to the RSSI value of obtaining according to the algorithm computation of setting, and exports to described judging unit;
Whether the described power adjustment of described judgment unit judges is in default scope; If judge described power adjustment in default scope, then described power adjustment exported to described transmitting element; Otherwise, abandon the power adjustment that this calculates;
The described power adjustment that described transmitting element will receive sends to described adjusted value dispensing device.
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| CN2005101275360A CN100407592C (en) | 2005-12-05 | 2005-12-05 | Back interference conquering method and system |
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| CN100407592C true CN100407592C (en) | 2008-07-30 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101651476B (en) * | 2008-08-14 | 2013-02-27 | 华为技术有限公司 | Method for limiting transmitted power of terminal and wireless access equipment |
| CN102791021B (en) * | 2011-05-16 | 2014-12-24 | 华为技术有限公司 | Method and device for determining transmission power of probe |
| CN105974437B (en) * | 2016-04-28 | 2019-03-05 | 努比亚技术有限公司 | A kind of method, apparatus and terminal promoting terminal applies performance |
| CN111405651B (en) * | 2020-03-27 | 2023-12-26 | 北京小米移动软件有限公司 | Method, device and medium for dynamically adjusting transmitting power |
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| US6657976B1 (en) * | 1998-09-01 | 2003-12-02 | Weblink Wireless, Inc. | System and method for controlling transmitter power of a narrowband advanced messaging system |
| CN1250342A (en) * | 1998-09-15 | 2000-04-12 | 三星电子株式会社 | Backward power control method in cellular system |
| US6591110B1 (en) * | 2000-06-27 | 2003-07-08 | Lucent Technologies Inc. | Method of detecting and calculating external jammer signal power in communication systems |
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