CN102469564A - Method and device for determining adjustment strategy of downlink power gain - Google Patents
Method and device for determining adjustment strategy of downlink power gain Download PDFInfo
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- CN102469564A CN102469564A CN2010105473126A CN201010547312A CN102469564A CN 102469564 A CN102469564 A CN 102469564A CN 2010105473126 A CN2010105473126 A CN 2010105473126A CN 201010547312 A CN201010547312 A CN 201010547312A CN 102469564 A CN102469564 A CN 102469564A
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Abstract
The invention relates to the technical field of communication, aiming to solve the problem of same frequency interference in the prior art. The invention provides a method and device for determining an adjustment strategy of downlink power gain. The method comprise the following steps that a base station determines the type of a user terminal according to downlink channel quality fed back by the terminal; and the base station determines the adjustment strategy of the downlink power gain according to the type of the user terminal. As the adjustment strategy of the downlink power gain is determined according to the type of the user terminal, targeted adjustment can be carried out so that the same frequency interference can be avoided as much as possible.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method and device of definite descending power gain adjustment strategy.
Background technology
In recent years; OFDMA (Orthogonal Frequency Division Multiple Access; OFDM inserts) technology is owing to can be effectively become the mainstream technology of radio communication physical-layer techniques to anti-multipath interference and narrow band interference, spectrum efficiency height; The CDMA technology in the 3rd generation of OFDMA+MIMO compared with techniques has natural technical advantage, is more suitable for being acknowledged as one of core technology of next generation mobile communication system in wide-band mobile communication system.WiMAX; Be worldwide interoperability for microwave access (Worldwide Interoperability for Microwave Access); Adopting the OFDMA technology for the physical layer core technology and take into account mobility and the WiMAX 802.16e standard of broadband characteristics and the 802.16m standard formulated, is the strong competitor of next generation mobile communication standard.
At present, various normal structures can be divided into the mode of inter-cell interference cancellation: interference randomization, Interference Cancellation and three kinds of technology of interference coordination.During to inter-cell interference cancellation, just simply all terminals, this sub-district are being adjusted upward the descending power gain based on interference coordination technique in the prior art, can cause like this and produce the problem of disturbing with frequently between different districts.
Summary of the invention
In order to solve in the prior art based on existing interference coordination technique to inter-cell interference cancellation, can cause the problem of disturbing with frequently, the invention provides a kind of method and device of definite descending power gain adjustment strategy.
The method of a kind of definite descending power gain adjustment strategy that the embodiment of the invention provides comprises:
Type of user terminal is confirmed according to the down channel quality of terminal feedback in the base station;
The adjustment strategy of descending power gain is confirmed according to type of user terminal in the base station.
The embodiment of the invention also provides a kind of device of definite descending power gain adjustment strategy, comprising:
Type determination module: be used for down channel quality, confirm type of user terminal according to terminal feedback;
Strategy determination module: be used for according to type of user terminal, confirm the adjustment strategy of descending power gain.
Because the scheme that provides of the embodiment of the invention, owing to, confirm the adjustment strategy of descending power gain according to type of user terminal, can be targetedly to different type of user terminal, avoid with disturbing frequently thereby adopt separately corresponding strategy to adjust as far as possible.
Description of drawings
The method flow diagram that Fig. 1 provides for the embodiment of the invention;
The structure drawing of device of Fig. 2 for providing for the embodiment of the invention.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to the embodiment of the invention.
When the technical scheme adjustment descending power of inventive embodiments gains; Relate to power gain (Boosting) value of center of housing estate user terminal in the ofdma communication system; Particularly based on the value on the power Boosting basis of the data subcarrier of WiMAX 802.16e standard; According to WiMAX 802.16e standard, the value of the power gain Boosting of data subcarrier is 000:Normal; 001:+6db; 010:-6db; 011:+9db; 100:+3db; 101:-3db; 110:-9db; 111:-12db, totally 8 kinds.For unified with standard, the value of the power Boosting at central user terminal is-3db ,-6db, and-9db, four values of-12db, corresponding sequence number is respectively 101,010, and 110,111; In the value of power Boosting of far point user terminal be+3db ,+6db, three values of+9db, corresponding sequence number is respectively 100,001,011.Explanation is designated as DLRSSI to original down receiving signal intensity here for ease
Old, descending signal to noise ratio is designated as DLCINR
OldDown receiving signal intensity behind the self adaptation adjustment Boosting is designated as DLRSSI
New, be designated as DLCINRn to the descending signal to noise ratio of self adaptation adjustment Boosting
EwThe step-length of Boosting value adjustment is designated as Boosting
BiasThe gross power Boosting of user terminal data subcarrier is:
Boosting
new＝Boosting
old+Boosting
Bias
Be the basis with DLCINR and DLRSSI in the present embodiment, the community user terminal carried out as giving a definition,
Central user terminal: DLRSSI＞=DLRSSI
CenterThreshold, DLRSSI
CenterThresholdBe central user terminal down receiving signal strength threshold, DLCINR is more than or equal to the user terminal of 28dB simultaneously.
Near point user terminal: DLCINR is more than or equal to the non-central user terminal that withdraws from thresholding of high order modulation coded system.
In far point user terminal: DLCINR withdraw from the user terminal of thresholding less than high-order.
Because the maximum of the basic feedback system of DLCINR all is merely 28dB, whether need reduce how many Boosting values so only can't accurately judge this terminal through DLCINR.The basic realization thinking of this programme is: according to signal strength signal intensity and signal to noise ratio judges terminal type, select this user terminal self adaptation adjustment power Boosting according to judged result again.
When user terminal is judged as the central user terminal, through the comparison of down receiving signal intensity, to attempt the power Boosting of user terminal is adjusted downwards, the gross power of the subcarrier that Updates Information is Boosting
New=Boosting
Old+ Boosting
Bias, this moment Boosting
BiasBe negative value; Following one-period will be observed the descending signal to noise ratio of this user terminal, if become middle far point user terminal, or produce bigger descending Packet Error Ratio, then carry out rollback.
When user terminal is the near point user terminal,, needs to use positive adjusted value, otherwise need the Boosting of user terminal not adjusted if modulation coding mode is not high-order.
When user terminal is middle far point user terminal, need to improve the descending power Boosting of user terminal.
Through effective judgment mechanism; Can so that the terminal through self adaptation adjustment power Boosting after; Descending CINR reaches in the reasonable range, neighbor cell is not caused under the situation of interference in assurance, makes the terminal obtain higher descending signal to noise ratio; Thereby use modulation coding mode more efficiently, and then the downlink throughput capacity of system is got a promotion.
As shown in Figure 1 the comprising of main flow process of this embodiment:
Step 101, base station be to the feedback of terminal to apply down channel quality, terminal feedback DLRSSI and DLCINR.
Step 102, according to the down channel quality of terminal feedback, the judges terminal whether be in the far point user terminal, be execution in step 103 then, otherwise execution in step 104.
Step 103, according to DLCINR calculate with the difference of the entering thresholding of high order modulation coded system and the power Boosting value that increases big or small, and upgrade total Boosting value, execution in step 108.
Whether step 104 is the central user terminal according to the down channel quality judges terminal of terminal feedback, is execution in step 105 then, otherwise execution in step 106.
Step 105 is calculated DLRSSI and DLRSSI
CenterThresholdBetween difference, calculate the negative Boosting size of adjustment downwards, and upgrade total Boosting value.
Step 106 is confirmed as the near point user terminal, judges whether modulation coding mode is high-order, is execution in step 108 then, otherwise execution in step 107.
Step 107 adjusts upward power Boosting.
Step 108 finishes the adjustment of this cycle.
In sum, the present invention is the method that a kind of user terminal to unlike signal intensity uses different descending power Boosting strategies, facts have proved that this method can keep lower interference level when effectively improving the sub-district covering.
The embodiment of the invention also provides a kind of device of definite descending power gain adjustment strategy, as shown in Figure 2 comprising:
Type determination module 201: be used for down channel quality, confirm type of user terminal according to terminal feedback;
Strategy determination module 202: be used for according to type of user terminal, confirm the adjustment strategy of descending power gain.
Further, type determination module 201: also be used for the down channel quality according to terminal feedback, confirm type of user terminal, the down channel quality of feedback comprises that feeding back downlink receives signal strength signal intensity and descending signal to noise ratio.
Further; Strategy determination module 202: be used for also judging whether the terminal is middle far point user terminal, if type of user terminal is middle far point user terminal according to the descending signal to noise ratio of terminal feedback; Then according to the difference of descending signal to noise ratio with the entering thresholding of high order modulation coded system; To be descending signal to noise ratio withdraw from the terminal of thresholding less than high-order for power gain value that calculating adjusts upward size, and the gain of adjustment descending power, middle far point user terminal.
Further; Strategy determination module 202: also be used for if type of user terminal is not the far point user terminal, whether the judges terminal type is the central user terminal, if type of user terminal is the central user terminal; Then according to the difference between down receiving signal intensity and the central user terminal down receiving signal strength threshold; Calculate the power gain value size of adjustment downwards, and the gain of adjustment descending power, the central user terminal is that down receiving signal intensity is more than or equal to central user terminal down receiving signal strength threshold; And descending signal to noise ratio is more than or equal to the terminal of setting threshold, and setting threshold withdraws from thresholding greater than high-order.
Further; Strategy determination module 202: also be used for if type of user terminal is not the central user terminal; Confirm that then type of user terminal is the near point user terminal; Whether the modulation system of judging the near point user terminal is high-order, if then to descending power gain do not adjust, otherwise adjust upward power gain.
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, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. the method for a definite descending power gain adjustment strategy is characterized in that, comprising:
Type of user terminal is confirmed according to the down channel quality of terminal feedback in the base station;
The adjustment strategy of descending power gain is confirmed according to type of user terminal in the base station.
2. the method for claim 1 is characterized in that, the down channel quality of feedback comprises that feeding back downlink receives signal strength signal intensity and descending signal to noise ratio.
3. method as claimed in claim 2 is characterized in that, the base station confirms that according to type of user terminal the adjustment strategy of descending power gain is specially:
When the base station judges that according to the descending signal to noise ratio of terminal feedback the terminal is middle far point user terminal; According to the difference of descending signal to noise ratio with the entering thresholding of high order modulation coded system; The power gain value size that calculating adjusts upward; And adjustment descending power gain, to be descending signal to noise ratio withdraw from the terminal of thresholding less than high-order to middle far point user terminal.
4. method as claimed in claim 3 is characterized in that, the base station confirms that according to type of user terminal the adjustment strategy of descending power gain is specially:
If type of user terminal is not middle far point user terminal; When the judges terminal type is the central user terminal; According to the difference between down receiving signal intensity and the central user terminal down receiving signal strength threshold; Calculate the power gain value size of adjustment downwards, and the gain of adjustment descending power, the central user terminal is that down receiving signal intensity is more than or equal to central user terminal down receiving signal strength threshold; And descending signal to noise ratio is more than or equal to the terminal of setting threshold, and setting threshold withdraws from thresholding greater than high-order.
5. method as claimed in claim 4 is characterized in that, the base station confirms that according to type of user terminal the adjustment strategy of descending power gain is specially:
If type of user terminal is not the central user terminal, confirm that then type of user terminal is the near point user terminal, whether the modulation system of judging the near point user terminal for high-order, is not adjusted if then descending power is not gained, otherwise is adjusted upward power gain.
6. the device of a definite descending power gain adjustment strategy is characterized in that, comprising:
Type determination module: be used for down channel quality, confirm type of user terminal according to terminal feedback;
Strategy determination module: be used for according to type of user terminal, confirm the adjustment strategy of descending power gain.
7. device as claimed in claim 6 is characterized in that, the type determination module: also be used for the down channel quality according to terminal feedback, confirm type of user terminal, the down channel quality of feedback comprises that feeding back downlink receives signal strength signal intensity and descending signal to noise ratio.
8. device as claimed in claim 7 is characterized in that, tactful determination module: also be used for judging according to the descending signal to noise ratio of terminal feedback; Whether the terminal is middle far point user terminal; If type of user terminal is middle far point user terminal, then, calculate the power gain value size that adjusts upward according to the difference of descending signal to noise ratio with the entering thresholding of high order modulation coded system; And adjustment descending power gain, to be descending signal to noise ratio withdraw from the terminal of thresholding less than high-order to middle far point user terminal.
9. device as claimed in claim 8; It is characterized in that; The strategy determination module: also be used for if type of user terminal is not the far point user terminal, whether the judges terminal type is the central user terminal, if type of user terminal is the central user terminal; Then according to the difference between down receiving signal intensity and the central user terminal down receiving signal strength threshold; Calculate the power gain value size of adjustment downwards, and the gain of adjustment descending power, the central user terminal is that down receiving signal intensity is more than or equal to central user terminal down receiving signal strength threshold; And descending signal to noise ratio is more than or equal to the terminal of setting threshold, and setting threshold withdraws from thresholding greater than high-order.
10. device as claimed in claim 9; It is characterized in that; The strategy determination module: also be used for if type of user terminal is not the central user terminal, confirm that then type of user terminal is the near point user terminal, whether the modulation system of judging the near point user terminal is high-order; Do not adjust if then descending power is not gained, otherwise adjust upward power gain.
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| CN2010105473126A CN102469564A (en) | 2010-11-16 | 2010-11-16 | Method and device for determining adjustment strategy of downlink power gain |
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| WO2014048233A1 (en) * | 2012-09-25 | 2014-04-03 | Huawei Technologies Co., Ltd. | Self adaptive multi-level downlink power control for noise-limited wireless cellular networks |
| CN109644070A (en) * | 2016-06-15 | 2019-04-16 | 弗劳恩霍夫应用研究促进协会 | 1 bit signaling is fed back to configure or change the setting of communication system |
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| WO2014048233A1 (en) * | 2012-09-25 | 2014-04-03 | Huawei Technologies Co., Ltd. | Self adaptive multi-level downlink power control for noise-limited wireless cellular networks |
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| CN109644070A (en) * | 2016-06-15 | 2019-04-16 | 弗劳恩霍夫应用研究促进协会 | 1 bit signaling is fed back to configure or change the setting of communication system |
| CN109644070B (en) * | 2016-06-15 | 2022-03-08 | 弗劳恩霍夫应用研究促进协会 | Apparatus for 1 bit signaling feedback to configure or change a communication system |
| US11722190B2 (en) | 2016-06-15 | 2023-08-08 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | 1 bit signaling feedback to configure or change the settings of a communication system |
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Application publication date: 20120523 |