CN103220679A - Method and device of reducing HSDPA same-frequency interference - Google Patents
Method and device of reducing HSDPA same-frequency interference Download PDFInfo
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Abstract
The invention provides a method of reducing HSDPA same-frequency interference. The method of reducing the HSDPA same-frequency interference includes the following steps of receiving a polling dispatching parameter issued by RNC, and dispatching far-point users which generate strong interference to users in same-frequency adjacent cells according to the polling dispatching parameter. The invention further provides a device of reducing the HSDPA same-frequency interference. The method of reducing the HSDPA same-frequency interference and the device of reducing the HSDPA same-frequency interference can eliminate the interference among the far-point users in the HSDPA same-frequency adjacent cells so as to improve the performance of HSDPA users.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly a kind of method and device that reduces the HSDPA co-channel interference.
Background technology
Under the HSDPA identical networking, if the far point user is subjected to the adjacent area co-channel interference, this far point user's performance loss will be very serious.Fig. 1 is the co-channel interference schematic diagram of far point user under the HSDPA identical networking.Among Fig. 1:
NB1 and NB2 are respectively the base station of two homogeneous-frequency adjacent-domains;
UE1 and UE2 are respectively the user terminal in these two homogeneous-frequency adjacent-domains;
UE1 is far away from the distance of NB1, is positioned at cell edge;
UE2 is also far away from the distance of NB2, is positioned at cell edge;
UE1 and UE2 are respectively the far point HSDPA users in these two homogeneous-frequency adjacent-domains, have serious co-channel interference between UE1 and the UE2.
Summary of the invention
The invention provides a kind of method and device of the HSDPA of reduction co-channel interference, can eliminate the interference between the far point user in the HSDPA homogeneous-frequency adjacent-domain, thereby improve HSDPA user's performance.
A kind of method that reduces the HSDPA co-channel interference provided by the invention comprises:
Receive the polling dispatching parameter that radio network controller (RNC) issues; Described polling dispatching parameter is used for making each sub-district of homogeneous-frequency adjacent-domain each other to adopt the mode of poll respectively the strong jamming far point user of this sub-district to be dispatched; Described strong jamming far point user is meant: the user to homogeneous-frequency adjacent-domain produces strongly disturbing far point user;
According to described polling dispatching parameter, the strong jamming far point user in this sub-district is dispatched.
Preferably, described polling dispatching parameter is a unit with the subframe, comprising: cycle, length and skew; Wherein:
Cycle is represented the subframe sum in the dispatching cycle;
Length is represented the number of sub frames that can dispatch continuously in the dispatching cycle;
The skew of the original position of schedulable subframe in the dispatching cycle with respect to cycle starting point represented in skew;
The sub-district that the parameter that the sub-district of homogeneous-frequency adjacent-domain was each other disposed in same dispatching cycle guarantees homogeneous-frequency adjacent-domain does not each other overlap strong jamming far point user's scheduling subframe;
Judge (sequence number-skew of current subframe) to the result of cycle delivery whether less than length, if less than, then judge current subframe for can dispatch subframe, in current subframe the strong jamming far point user in this sub-district is dispatched.
Preferably, judge that whether the user produces strongly disturbing mode to the user of homogeneous-frequency adjacent-domain and be:
Detect the received signal code power (RSCP) that (MCJD) measures adjacent community user according to multi-plot joint;
For the adjacent community user of RSCP greater than default RSCP thresholding, the wave beam based on characteristic value of measuring described adjacent community user forms (EBB) figuration factor;
Calculate the correlation of described user and described adjacent community user according to the EBB figuration factor of described user and described adjacent community user,, judge that then described user produces strong jamming to the user of homogeneous-frequency adjacent-domain if result of calculation is strong correlation.
Preferably, judge that whether the user is that far point user's mode is:
Whether the channel quality indication (CQI) of judging described reporting of user continues smaller or equal to default CQI thresholding, if judge that then described user is the far point user.
Preferably, the CQI that judges described reporting of user whether continue less than the mode of default CQI thresholding be:
Counter is set, and the CQI that the initial value of counter is set to preset counts maximum; Represent that with CQIDistriCounter the value of counter, MaxCQIDistriCounter represent CQI counting maximum;
Whenever receive effective CQI of described user, whether judge result after the described effective CQI normalization greater than default CQI thresholding, if, then:
CQIDistriCounter=Min (CQIDistriCounter+1, MaxCQIDistriCounter); Otherwise:
CQIDistriCounter=Max (CQIDistriCounter-CQIDistriDownStep, 0); Wherein, CQIDistriDownStep is default counter decrement step size;
If the value of counter judges then that less than default CQI counting thresholding the CQI of described reporting of user continues less than default CQI thresholding.
A kind of device that reduces the HSDPA co-channel interference provided by the invention comprises: communication module and scheduler module, wherein:
Described communication module is used for receiving the polling dispatching parameter from radio network controller (RNC); Described polling dispatching parameter is used for making each sub-district of homogeneous-frequency adjacent-domain each other to adopt the mode of poll respectively the strong jamming far point user of this sub-district to be dispatched; Described strong jamming far point user is meant: the user to homogeneous-frequency adjacent-domain produces strongly disturbing far point user;
Described scheduler module is used for according to described polling dispatching parameter the strong jamming far point user in this sub-district being dispatched.
Preferably, described polling dispatching parameter is a unit with the subframe, comprising: cycle, length and skew; Wherein:
Cycle is represented the subframe sum in the dispatching cycle;
Length is represented the number of sub frames that can dispatch continuously in the dispatching cycle;
The skew of the original position of schedulable subframe in the dispatching cycle with respect to cycle starting point represented in skew;
The sub-district that described polling dispatching parameter is disposed the sub-district of homogeneous-frequency adjacent-domain each other in same dispatching cycle parameter guarantees homogeneous-frequency adjacent-domain does not each other overlap strong jamming far point user's scheduling subframe;
To the result of cycle delivery during less than length, described scheduler module is judged current subframe for can dispatch subframe, and in current subframe the strong jamming far point user in this sub-district is dispatched in (sequence number-skew of current subframe).
Preferably, treat dispatched users for each, described scheduler module also is used for detecting the received signal code power (RSCP) that (MCJD) measures adjacent community user according to multi-plot joint; And to the adjacent community user of RSCP greater than default RSCP thresholding, the wave beam based on characteristic value of measuring described adjacent community user forms (EBB) figuration factor; And be used for calculating the described correlation for the treatment of dispatched users and described adjacent community user according to the described EBB figuration factor of dispatched users and described adjacent community user for the treatment of, when result of calculation is strong correlation, judge that the described dispatched users for the treatment of produces strong jamming to the user of homogeneous-frequency adjacent-domain.
Preferably, treat dispatched users for each, described scheduler module is used to also judge whether the channel quality indication (CQI) of described reporting of user continues smaller or equal to default CQI thresholding, if judge that then described user is the far point user.
Preferably, when whether the CQI that judges described reporting of user continued less than default CQI thresholding, described scheduler module was used to carry out following operation:
Counter is set, and the CQI that the initial value of counter is set to preset counts maximum; Represent that with CQIDistriCounter the value of counter, MaxCQIDistriCounter represent CQI counting maximum;
Whenever receive effective CQI of described user, whether judge result after the described effective CQI normalization greater than default CQI thresholding, if, then:
CQIDistriCounter＝Min(CQIDistriCounter+1，MaxCQIDistriCounter)；
Otherwise:
CQIDistriCounter＝Max(CQIDistriCounter-CQIDistriDownStep，0)；
Wherein, CQIDistriDownStep is default counter decrement step size;
If the value of counter judges then that less than default CQI counting thresholding the CQI of described reporting of user continues less than default CQI thresholding.
As seen from the above technical solution, the method and apparatus of the reduction HSDPA co-channel interference that the present invention proposes, under the HSDPA identical networking, by sending polling dispatching parameter to each sub-district of homogeneous-frequency adjacent-domain each other by RNC, and by each sub-district of homogeneous-frequency adjacent-domain each other respectively according to received polling dispatching parameter, the mode of employing poll is dispatched the strong jamming far point user in this sub-district, realized polling dispatching with the far point user in the sub-district of mutual interference frequently, making exists any two HSDPA far point users of co-channel interference not at same subframe scheduling, thereby eliminated the interference between the far point user in the HSDPA homogeneous-frequency adjacent-domain, and improved HSDPA user's performance.
Description of drawings
Fig. 1 is the co-channel interference schematic diagram of far point user under the HSDPA identical networking;
Fig. 2 is the schematic diagram that concerns between the polling dispatching parameter of the present invention;
Fig. 3 is the composition structural representation of the device of the present invention's one preferable reduction HSDPA co-channel interference.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
Main thought of the present invention is: under the HSDPA identical networking, dispatch with the far point user in the sub-district of mutual interference frequently by the mode of poll, making exists any two HSDPA far point users of co-channel interference not at same subframe scheduling, thereby eliminate the interference between the far point user in the HSDPA homogeneous-frequency adjacent-domain, and improve HSDPA user's performance.
Particularly: by RNC according to identical networking information, determine which sub-district homogeneous-frequency adjacent-domain each other, and send the polling dispatching parameter that is used for next dispatching cycle to these sub-districts, this polling dispatching parameter is used for making mode that each sub-district of homogeneous-frequency adjacent-domain each other adopts poll respectively this sub-district to be produced strongly disturbing far point user to the user of homogeneous-frequency adjacent-domain dispatching, NodeB determines in this sub-district that according to the polling dispatching parameter user to homogeneous-frequency adjacent-domain produces strongly disturbing far point user and whether can be scheduled when the scheduling HSDPA user.Can realize issuing of polling dispatching parameter by defining privately owned frame.
Preferably, the polling dispatching parameter can comprise three parameters: cycle, length, skew, these three parameters all are unit with the subframe, wherein:
Cycle is represented the subframe sum in the dispatching cycle;
Length is represented the number of sub frames that can dispatch continuously in the dispatching cycle;
The skew of the original position of schedulable subframe in the dispatching cycle with respect to cycle starting point represented in skew;
The sub-district that the polling dispatching parameter is disposed the sub-district of homogeneous-frequency adjacent-domain each other in same dispatching cycle parameter guarantees homogeneous-frequency adjacent-domain does not each other overlap strong jamming far point user's scheduling subframe, thereby makes each sub-district of homogeneous-frequency adjacent-domain each other adopt the mode of poll to dispatch strong jamming far point user in this sub-district respectively.
Relation between the polling dispatching parameter as shown in Figure 2.The polling dispatching parameter guarantees that the sub-district of homogeneous-frequency adjacent-domain does not each other overlap mutually to strong jamming far point user's scheduling subframe (being shown in Fig. 2 oblique line part).
Adopt the mode of poll for each sub-district that makes homogeneous-frequency adjacent-domain each other by the polling dispatching parameter and dispatch strong jamming far point user in this sub-district respectively, RNC is when issuing the polling dispatching parameter, a kind of preferable mode is: the value to the cycle parameter that the sub-district sent of homogeneous-frequency adjacent-domain each other and length parameter is identical respectively, and the value difference of offset parameter.So just can guarantee to exist any two HSDPA far point users of co-channel interference not at same subframe scheduling.Certainly, can also take other modes that the polling dispatching parameter is set in actual applications, as long as can make each sub-district of homogeneous-frequency adjacent-domain each other adopt the mode of poll to dispatch strong jamming far point user in this sub-district respectively.
After NodeB receives the polling dispatching parameter, only allow in the subframe strong jamming HSDPA user is dispatched can dispatching.Determine whether current subframe is that the mode that can dispatch subframe is: judge (sequence number-skew of current subframe) to the result of cycle delivery whether less than length, if less than, judge that then current subframe is for can dispatch subframe.
Except needs determine whether current subframe is to dispatch the subframe, NodeB needs also to judge that whether current HSDPA user to be scheduled is that user to homogeneous-frequency adjacent-domain produces strongly disturbing far point user, that is: need to judge whether this user can produce strong jamming to the user in the homogeneous-frequency adjacent-domain, and need to judge whether this user is the far point user.Below judgment mode is illustrated respectively:
Judge that whether the user produces strongly disturbing a kind of preferred mode to the user of homogeneous-frequency adjacent-domain and be:
Detect the received signal code power (RSCP) that (MCJD) measures adjacent community user according to multi-plot joint;
For the adjacent community user of RSCP, measure EBB (Eigevalue-based beamforming is based on the wave beam formation of characteristic value) the figuration factor of this neighbour's community user greater than default RSCP thresholding;
Calculate the correlation of this user and this neighbour's community user according to the EBB figuration factor of this user and this neighbour's community user,, judge that then this user can produce strong jamming to the user of homogeneous-frequency adjacent-domain if result of calculation is strong correlation.
Judge that whether the user is that a kind of preferred mode of far point user is:
Whether the channel quality indication (CQI) of judging this reporting of user continues smaller or equal to default CQI thresholding, if judge that then this user is the far point user.
When specific implementation, can whether continue smaller or equal to the number of times of default CQI thresholding or the CQI that probability is judged this user according to the CQI of this user in one section Preset Time smaller or equal to default CQI thresholding.Below example in be that example is judged with the number of times:
Counter (following represent with symbol CQIDistriCounter) is set, and the initial value of the counter CQI counting maximum that is set to preset (is followingly represented with symbol M axCQIDistriCounter;
Whenever receive effective CQI of this user, whether judge result after this effective CQI normalization greater than default CQI thresholding, if, then:
CQIDistriCounter=Min (CQIDistriCounter+1, MaxCQIDistriCounter); Otherwise:
CQIDistriCounter＝Max(CQIDistriCounter-CQIDistriDownStep，0)；
Wherein, CQIDistriDownStep is default counter decrement step size;
If the value of counter judges then that less than default CQI counting thresholding the CQI of this reporting of user continues less than default CQI thresholding, this user is the far point user.
In the above-mentioned example, CQI counting thresholding is counted maximum less than CQI.
Corresponding to said method, the invention provides a kind of device of reduction HSDPA co-channel interference as shown in Figure 3.The described device of Fig. 3 comprises: communication module 310 and scheduler module 320, wherein:
Preferably, the polling dispatching parameter is a unit with the subframe, comprising: cycle, length and skew; Wherein:
Cycle is represented the subframe sum in the dispatching cycle;
Length is represented the number of sub frames that can dispatch continuously in the dispatching cycle;
The skew of the original position of schedulable subframe in the dispatching cycle with respect to cycle starting point represented in skew;
The sub-district that the polling dispatching parameter is disposed the sub-district of homogeneous-frequency adjacent-domain each other in same dispatching cycle parameter guarantees homogeneous-frequency adjacent-domain does not each other overlap strong jamming far point user's scheduling subframe;
To the result of cycle delivery during less than length, scheduler module 320 is judged current subframe for can dispatch subframe, and in current subframe the strong jamming far point user in this sub-district is dispatched in (sequence number-skew of current subframe).
Preferably, treat dispatched users for each, scheduler module 320 also is used for measuring according to MCJD the RSCP of adjacent community user; And, measure the EBB figuration factor of this neighbour's community user to the adjacent community user of RSCP greater than default RSCP thresholding; And be used for calculating the correlation that this treats dispatched users and this neighbour's community user according to this EBB figuration factor for the treatment of dispatched users and this neighbour's community user, when result of calculation is strong correlation, judge that this treats that dispatched users produces strong jamming to the user of homogeneous-frequency adjacent-domain.
Preferably, treat dispatched users for each, scheduler module 320 is used to also judge whether the CQI of this reporting of user continues smaller or equal to default CQI thresholding, if judge that then this user is the far point user.
When whether the CQI that judges reporting of user continued less than default CQI thresholding, scheduler module 320 can be used to carry out following operation:
Counter is set, and the CQI that the initial value of counter is set to preset counts maximum; Represent that with CQIDistriCounter the value of counter, MaxCQIDistriCounter represent CQI counting maximum;
Whenever receive effective CQI of described user, whether judge result after the described effective CQI normalization greater than default CQI thresholding, if, then:
CQIDistriCounter=Min (CQIDistriCounter+1, MaxCQIDistriCounter); Otherwise:
CQIDistriCounter＝Max(CQIDistriCounter-CQIDistriDownStep，0)；
Wherein, CQIDistriDownStep is default counter decrement step size;
If the value of counter judges then that less than default CQI counting thresholding the CQI of described reporting of user continues less than default CQI thresholding.
As seen from the above-described embodiment, the method and apparatus of the reduction HSDPA co-channel interference that the present invention proposes, under the HSDPA identical networking, by sending polling dispatching parameter to each sub-district of homogeneous-frequency adjacent-domain each other by RNC, and by each sub-district of homogeneous-frequency adjacent-domain each other respectively according to received polling dispatching parameter, the mode of employing poll is dispatched the strong jamming far point user in this sub-district, realized polling dispatching with the far point user in the sub-district of mutual interference frequently, making exists any two HSDPA far point users of co-channel interference not at same subframe scheduling, thereby eliminated the interference between the far point user in the HSDPA homogeneous-frequency adjacent-domain, and improved HSDPA user's performance.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a method that reduces the HSDPA co-channel interference is characterized in that, comprising:
Receive the polling dispatching parameter that radio network controller (RNC) issues; Described polling dispatching parameter is used for making each sub-district of homogeneous-frequency adjacent-domain each other to adopt the mode of poll respectively the strong jamming far point user of this sub-district to be dispatched; Described strong jamming far point user is meant: the user to homogeneous-frequency adjacent-domain produces strongly disturbing far point user;
According to described polling dispatching parameter, the strong jamming far point user in this sub-district is dispatched.
2. method according to claim 1 is characterized in that:
Described polling dispatching parameter is a unit with the subframe, comprising: cycle, length and skew; Wherein:
Cycle is represented the subframe sum in the dispatching cycle;
Length is represented the number of sub frames that can dispatch continuously in the dispatching cycle;
The skew of the original position of schedulable subframe in the dispatching cycle with respect to cycle starting point represented in skew;
The sub-district that described polling dispatching parameter is disposed the sub-district of homogeneous-frequency adjacent-domain each other in same dispatching cycle parameter guarantees homogeneous-frequency adjacent-domain does not each other overlap strong jamming far point user's scheduling subframe;
Judge (sequence number-skew of current subframe) to the result of cycle delivery whether less than length, if less than, then judge current subframe for can dispatch subframe, in current subframe the strong jamming far point user in this sub-district is dispatched.
3. method according to claim 1 and 2 is characterized in that, judges that whether the user produces strongly disturbing mode to the user of homogeneous-frequency adjacent-domain and be:
Detect the received signal code power (RSCP) that (MCJD) measures adjacent community user according to multi-plot joint;
For the adjacent community user of RSCP greater than default RSCP thresholding, the wave beam based on characteristic value of measuring described adjacent community user forms (EBB) figuration factor;
Calculate the correlation of described user and described adjacent community user according to the EBB figuration factor of described user and described adjacent community user,, judge that then described user produces strong jamming to the user of homogeneous-frequency adjacent-domain if result of calculation is strong correlation.
4. method according to claim 1 and 2 is characterized in that, judges that whether the user is that far point user's mode is:
Whether the channel quality indication (CQI) of judging described reporting of user continues smaller or equal to default CQI thresholding, if judge that then described user is the far point user.
5. method according to claim 4 is characterized in that, the CQI that judges described reporting of user whether continue less than the mode of default CQI thresholding be:
Counter is set, and the CQI that the initial value of counter is set to preset counts maximum; Represent that with CQIDistriCounter the value of counter, MaxCQIDistriCounter represent CQI counting maximum;
Whenever receive effective CQI of described user, whether judge result after the described effective CQI normalization greater than default CQI thresholding, if, then:
CQIDistriCounter=Min (CQIDistriCounter+1, MaxCQIDistriCounter); Otherwise:
CQIDistriCounter=Max (CQIDistriCounter-CQIDistriDownStep, 0); Wherein, CQIDistriDownStep is default counter decrement step size;
If the value of counter judges then that less than default CQI counting thresholding the CQI of described reporting of user continues less than default CQI thresholding.
6. a device that reduces the HSDPA co-channel interference is characterized in that, comprising: communication module and scheduler module, wherein:
Described communication module is used for receiving the polling dispatching parameter from radio network controller (RNC); Described polling dispatching parameter is used for making each sub-district of homogeneous-frequency adjacent-domain each other to adopt the mode of poll respectively the strong jamming far point user of this sub-district to be dispatched; Described strong jamming far point user is meant: the user to homogeneous-frequency adjacent-domain produces strongly disturbing far point user;
Described scheduler module is used for according to described polling dispatching parameter the strong jamming far point user in this sub-district being dispatched.
7. device according to claim 6 is characterized in that:
Described polling dispatching parameter is a unit with the subframe, comprising: cycle, length and skew; Wherein:
Cycle is represented the subframe sum in the dispatching cycle;
Length is represented the number of sub frames that can dispatch continuously in the dispatching cycle;
The skew of the original position of schedulable subframe in the dispatching cycle with respect to cycle starting point represented in skew;
The sub-district that described polling dispatching parameter is disposed the sub-district of homogeneous-frequency adjacent-domain each other in same dispatching cycle parameter guarantees homogeneous-frequency adjacent-domain does not each other overlap strong jamming far point user's scheduling subframe;
To the result of cycle delivery during less than length, described scheduler module is judged current subframe for can dispatch subframe, and in current subframe the strong jamming far point user in this sub-district is dispatched in (sequence number-skew of current subframe).
8. according to claim 6 or 7 described devices, it is characterized in that:
Treat dispatched users for each, described scheduler module also is used for detecting the received signal code power (RSCP) that (MCJD) measures adjacent community user according to multi-plot joint; And to the adjacent community user of RSCP greater than default RSCP thresholding, the wave beam based on characteristic value of measuring described adjacent community user forms (EBB) figuration factor; And be used for calculating the described correlation for the treatment of dispatched users and described adjacent community user according to the described EBB figuration factor of dispatched users and described adjacent community user for the treatment of, when result of calculation is strong correlation, judge that the described dispatched users for the treatment of produces strong jamming to the user of homogeneous-frequency adjacent-domain.
9. according to claim 6 or 7 described devices, it is characterized in that:
Treat dispatched users for each, described scheduler module is used to also judge whether the channel quality indication (CQI) of described reporting of user continues smaller or equal to default CQI thresholding, if judge that then described user is the far point user.
10. method according to claim 9 is characterized in that, when whether the CQI that judges described reporting of user continued less than default CQI thresholding, described scheduler module was used to carry out following operation:
Counter is set, and the CQI that the initial value of counter is set to preset counts maximum; Represent that with CQIDistriCounter the value of counter, MaxCQIDistriCounter represent CQI counting maximum;
Whenever receive effective CQI of described user, whether judge result after the described effective CQI normalization greater than default CQI thresholding, if, then:
CQIDistriCounter＝Min(CQIDistriCounter+1，MaxCQIDistriCounter)；
Otherwise:
CQIDistriCounter＝Max(CQIDistriCounter-CQIDistriDownStep，0)；
Wherein, CQIDistriDownStep is default counter decrement step size;
If the value of counter judges then that less than default CQI counting thresholding the CQI of described reporting of user continues less than default CQI thresholding.
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| CN101043693A (en) * | 2006-03-23 | 2007-09-26 | 华为技术有限公司 | Method and system for inter-cell eliminating interference |
| US20080113692A1 (en) * | 2006-11-13 | 2008-05-15 | Palm, Inc. | Apparatus and Methods for Reducing Power Consumption and/or Radio Frequency Interference in a Mobile Computing Device |
| CN102036251A (en) * | 2009-09-25 | 2011-04-27 | 鼎桥通信技术有限公司 | Method for reducing same frequency interference |
| CN102170691A (en) * | 2011-05-20 | 2011-08-31 | 大唐移动通信设备有限公司 | Downlink channel power control method and device therefor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101043693A (en) * | 2006-03-23 | 2007-09-26 | 华为技术有限公司 | Method and system for inter-cell eliminating interference |
| US20080113692A1 (en) * | 2006-11-13 | 2008-05-15 | Palm, Inc. | Apparatus and Methods for Reducing Power Consumption and/or Radio Frequency Interference in a Mobile Computing Device |
| CN102036251A (en) * | 2009-09-25 | 2011-04-27 | 鼎桥通信技术有限公司 | Method for reducing same frequency interference |
| CN102170691A (en) * | 2011-05-20 | 2011-08-31 | 大唐移动通信设备有限公司 | Downlink channel power control method and device therefor |
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