CN104254120A - Downlink transmission control method - Google Patents
Downlink transmission control method Download PDFInfo
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- CN104254120A CN104254120A CN201310268152.5A CN201310268152A CN104254120A CN 104254120 A CN104254120 A CN 104254120A CN 201310268152 A CN201310268152 A CN 201310268152A CN 104254120 A CN104254120 A CN 104254120A
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- subband
- control information
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Abstract
A downlink transmission control method is characterized in that if a downlink control message, issued from a current frame Tx to UE (user equipment), is a special control message, whether or not power margin A of the current frame is less than power change caused by issuing the special control message; if yes, not issuing the special control message is determined; if not, issuing the special control message is determined; if the special control message is an opened downlink control message, a data transmission frame Ty corresponding to the opened downlink control message is pre-estimated, and whether or not power margin of the data transmission frame Ty is less than power change caused by issuing service data corresponding to the opened downlink control message is judged; if yes, not issuing the downlink control message is determined; if not, issuing the opened downlink control message is determined; if the downlink control message is a public control message, according to maximum downlink transmitting power and sub-band power of each sub-band having dwelling users, the sub-bands used for transmitting the public control message are determined, and the sum of the sub-band powers is not less than the maximum downlink transmitting power P<MAX>.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to a kind of control method of downlink transfer.
Background technology
In discrete narrow band system, in order to the bandwidth of adding users, improve transmission rate further, usually adopt the method for carrier aggregation to be combined by multiple discrete spectrum, form virtual continuous spectrum, finally realize the broadband of discrete narrow band resource.PDCCH and PDSCH time-sharing multiplex within the system, the public information that control channel issues was decided by the cycle, the cycle of all users is 0.5s, this time point is reserved, public information priority allocation resource until message is all sent completely for this reason, issue public information time be engraved on whole subband all access users issued.
Within the system, the business that real-time is high can seize the low service resources of real-time; Because PDCCH and PDSCH does not divide on frequency spectrum resource, so within the system, PDCCH authorization message (being sent by common control information or dedicated control information) can seize Common data transmission.
Under the scene that identical networking interference coordination is opened, all users are defaulted as edge customer when initially accessing, according to usable subbands sum and the edge band ratio of configuration, interference coordination obtains the alternative edge sub-band sum of each community, then by logic subband and physics subband mapping relations, edge subband and center sub-band is marked off.After starting interference coordination, will divide edge customer and central user, user centered by when PPR is greater than certain threshold value according to pilot to powerratio (Pilot Power Ratio, PPR), be edge customer when PPR is less than this threshold value.According to the division to customer edge and center, the power that base station assigns is different, corresponding central user uses low-power to carry out descending transmission, and edge customer uses high power to carry out descending transmission, and high power is greater than reference signal power, low-power is less than reference signal power.
In discrete narrow band system, when the ratio of edge customer and central user is excessive, or when the ratio of edge subband and center sub-band is excessive, the situation that descending base station transmitting power exceedes maximum transmission power restriction can be there is, and then affect the regular traffic of user.Such as, when many subbands user is edge customer, use many subbands high power may exceed the restriction of descending maximum transmission power.Like this, many subbands user not only can be caused to carry out regular traffic, also can affect other users successfully cannot initiate business simultaneously.At present a kind of solution to the problems described above is not yet proposed.
Summary of the invention
In view of this, main purpose of the present invention is the control method providing a kind of downlink transfer, and the method can effectively avoid down transmitting power to exceed the problem of maximum transmission power restriction.
In order to achieve the above object, the technical scheme that the present invention proposes is:
A kind of downlink transmission control method, comprising:
As present frame T
xwhen the Downlink Control Information needing to issue user equipment (UE) is dedicated control information, judge whether the power headroom A of present frame is less than the power variation Δ P issued caused by described dedicated control information
dci, if so, then determine not issue described dedicated control information at present frame; Otherwise, when described dedicated control information is not, when opening Downlink Control Information, determine to issue described dedicated control information at present frame, when described dedicated control information is for opening Downlink Control Information, estimate the data transmission frames T that described unlatching Downlink Control Information is corresponding
y, and judge this data transmission frames T
ypower headroom B whether be less than and issue the power variation Δ P caused by business datum corresponding to described unlatching Downlink Control Information
data, if so, then determine not issue described unlatching Downlink Control Information at present frame, otherwise, determine to issue described unlatching Downlink Control Information at present frame;
As present frame T
xwhen needs are common control information to the Downlink Control Information that described UE issues, according to the maximum downstream transmitting power P preset
mAXwith the current subband power that there is each subband of resident users, determine the current subband for sending described common control information; Wherein, the subband power summation of determined subband is less than or equal to described maximum downstream transmitting power P
mAX.
In sum, the control method of a kind of downlink transfer that the present invention proposes, by according to power headroom estimated value when current power headroom and transfer of data, control Downlink Control Information and open issuing of Downlink Control Information, thus can effectively avoid down transmitting power to exceed maximum transmission power restriction.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the embodiment of the present invention one.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Core concept of the present invention is: when issuing Downlink Control Information, according to present frame power headroom and issue the descending power intensity of variation that Downlink Control Information causes, judge whether to carry out issuing of Downlink Control Information, when Downlink Control Information is when opening DCI, estimate the descending power intensity of variation that power headroom corresponding to turn-on data transmission frame and transfer of data will cause, judge whether to issue and open DCI, in addition, for common control information, also need to guarantee that produced descending power expense is within the maximum downstream transmitting power scope of system, so can guarantee no matter be that downlink data transmission or the transmission of Downlink Control Information can be carried out within maximum downstream transmitting power scope.
Fig. 1 is the schematic flow sheet of the embodiment of the present invention one, and as shown in Figure 1, this embodiment mainly comprises:
Step 101, as present frame T
xwhen the Downlink Control Information needing to issue subscriber equipment (UE) is dedicated control information, judge whether the power headroom A of present frame is less than the power variation Δ P issued caused by described dedicated control information
dci, if so, then determine not issue described dedicated control information at present frame; Otherwise, when described dedicated control information is not, when opening Downlink Control Information, determine to issue described dedicated control information at present frame, when described dedicated control information is for opening Downlink Control Information, estimate the data transmission frames T that described unlatching Downlink Control Information is corresponding
y, and judge this data transmission frames T
ypower headroom B whether be less than and issue the power variation Δ P caused by business datum corresponding to described unlatching Downlink Control Information
data, if so, then determine not issue described unlatching Downlink Control Information at present frame, otherwise, determine to issue described unlatching Downlink Control Information at present frame.
In existing system, the Downlink Control Information according to action scope will divide into dedicated control information and common control information, and the former sends to designated user equipment, and the latter sends to all access user equipments.
This step is used for controlling issuing of dedicated control information, to guarantee that the descending power expense of consequent Downlink Control Information and transfer of data is within the maximum downstream transmitting power scope of system.
Here, for dedicated control information, if the power headroom A of present frame is less than the power variation Δ P issued caused by described dedicated control information
dciand power headroom is the idle power value obtained relative to system maximum downstream transmitting power, if therefore illustrate that now issuing this dedicated control information will cause descending power to exceed maximum downstream transmitting power, now, by controlling not issue this dedicated control information at present frame, can guarantee that descending power can not exceed maximum downstream transmitting power.
Descending power expense in order to control data transmission can not cause descending power to exceed maximum downstream transmitting power, this step controls for unlatching Downlink Control Information (namely opening DCI information) especially, by descending power whether being caused to exceed maximum downstream transmitting power to opened transfer of data estimate, control whether to issue Downlink Control Information, thus can guarantee that the power overhead of the transfer of data of being opened by it can not exceed maximum downstream transmitting power.In order to realize this purpose, needing to estimate and opening data transmission frames T corresponding to Downlink Control Information
y.It should be noted that, because issuing of Downlink Control Information in practical application may need repeatedly to transmit ability success, therefore, feedback time Downlink Control Information transmitted according to number of retransmissions and the UE of Downlink Control Information is needed particularly, to this data transmission frames T
yestimate, this number of retransmissions can arrange suitable value by those skilled in the art according to practical operation situation.
Particularly, can be according to
determine described A, wherein, m is T
xcarry out the sub band number of list band transmission in all subbands that-1 frame takies, n is T
xthe sub band number of many subbands business is carried out, P in all subbands that-1 frame takies
ifor carry out the transmission of list band subband i on carry out the subband power of the subscriber equipment transmitted, P
rSfor reference signal power, Σ Δ P
dci_lfor present frame T
xthe described Δ P that all Downlink Control Information issued are corresponding
dcisum.
Here it should be noted that, can be multiple owing to needing the control information issued in a frame, but one is only had for each user, therefore, if first Downlink Control Information that the Downlink Control Information issued is not present frame to be issued, then, when determining power headroom, need the power overhead taking into full account that present frame has produced, therefore, need to deduct Σ Δ P in above-mentioned formula in the maximum downstream transmitting power of system
dci_l, to the accurate estimation of power headroom during to guarantee to issue each Downlink Control Information.
Particularly, can be according to
determine described B, wherein, z is T
ycarry out the sub band number of list band transmission in all subbands that-1 frame takies, w is T
ythe sub band number of many subbands business is carried out, P in all subbands that-1 frame takies
ifor carry out the transmission of list band subband i on carry out the subband power of the subscriber equipment transmitted, P
rSfor reference signal power, Σ Δ P
data_kfor present frame T
xthe described Δ P that all unlatching Downlink Control Information issued are corresponding
datasum.
Here it should be noted that, if first unlatching Downlink Control Information that current issued unlatching Downlink Control Information is not present frame to be issued, then determining T
yduring the power headroom of frame, need to take into full account that the unlatching Downlink Control Information that present frame has sent will at T
ythe issuable power overhead of frame, therefore, needs to deduct Σ Δ P in the maximum downstream transmitting power of system in above-mentioned formula
data_k, to T during to guarantee to issue each unlatching Downlink Control Information
ythe estimation accuracy of frame power headroom.
Preferably, in order to more actual transmissions situation can accurately be reflected, subband transport service type can be distinguished and adopt following method to determine described Δ P
dci:
When the subband that described dedicated control information is seized is idle subband, Δ P
dci=P
rE_j;
When the subband that described dedicated control information is seized is the subband of list band transfer of data, Δ P
dci=P
rE_j-P
rE_i;
When the subband that described dedicated control information is seized is the subband of many subband datas transmission, Δ P
dci=P
rE_j-P
rSs;
Wherein, described P
rE_jfor receiving the subband power of the UE of described dedicated control information; Described P
rE_ifor the subband that described dedicated control information is seized being preempted the subband power of subscriber equipment; Described P
rSfor reference signal power; S the subband seized of described dedicated control information is preempted the sub band number that subscriber equipment takies.
Here it should be noted that, the power that in existing system, many subband data transmission use is reference signal power, therefore here according to P
rSs can calculate the power overhead being preempted UE.In addition, the same with existing system, dedicated control information only will take a subband, here only so will distinguish before this subband is preempted is for list band transfer of data or the transmission of many subband datas, consider if this subband transmits for many subband datas, UE then on this subband transmits with multiple subband, and the transmission power overhead that this UE produces should be the power overhead summation of this UE on these subbands and P
rSs, like this, seizes the transmission that this UE can be caused can not to carry out on its all subband due to subband, therefore, is determining Δ P
dcitime, need to consider at new transmission power overhead P
rE_jbasis deducts P
rSs.
Preferably, in order to more actual transmissions situation can accurately be reflected, subband transport service type can be distinguished and adopt following method to determine described Δ P
data:
If what described unlatching Downlink Control Information was opened is list band business, then
When the list band business that described unlatching Downlink Control Information is opened take be idle subband time, Δ P
data=P
rE_j; P
rE_jfor receiving the subband power of the UE of described unlatching Downlink Control Information;
When the list band business that described unlatching Downlink Control Information is opened take be the subband carrying out list band transfer of data time,
p
rE_ifor the described subband carrying out list band transfer of data being preempted the subband power of UE;
When the list band business that described unlatching Downlink Control Information is opened take be the subband carrying out the transmission of many subband datas time, Δ P
data=0;
If what described unlatching Downlink Control Information was opened is many subbands business, then
When many subbands business that described unlatching Downlink Control Information is opened take be idle subband time, Δ P
data=P
rS* m; Described P
rSfor reference signal power, described m is the sub band number that many subbands business of described unlatching Downlink Control Information unlatching takies;
When many subbands business that described unlatching Downlink Control Information is opened take be the subband carrying out list band transfer of data time,
described P
rE_ifor the list band i that described many subbands business is seized carrying out the subband power of the subscriber equipment of transfer of data; M is the number of sub-bands of described many subbands service needed, and h is single number of sub-bands that described many subbands business is seized.
Here, it should be noted that, in actual applications, idle subband may be comprised in the subband of many subbands service needed simultaneously and carry out the subband of transfer of data, therefore, need idle subband to foreclose here, according to
obtain the power overhead of the transfer of data be stopped caused owing to seizing.
When many subbands business that described unlatching Downlink Control Information is opened take be the subband carrying out the transmission of many subband datas time,
described n is the sub band number sum that the subscriber equipment that all subbands of seizing of many subbands business of opening of described unlatching Downlink Control Information carry out transfer of data takies.
Step 102, as present frame T
xwhen needs are common control information to the Downlink Control Information that described UE issues, according to the maximum downstream transmitting power P preset
mAXwith the current subband power that there is each subband of resident users, determine the current subband for sending described common control information; Wherein, the subband power summation of determined subband is less than or equal to described maximum downstream transmitting power P
mAX.
This step is used for controlling issuing of common control information, to guarantee that issuing of this information can not cause descending power to exceed maximum downstream transmitting power.
Concrete, following method can be adopted to determine the current subband for sending common control information:
Step a1, all subbands that there is resident users are added subband candidate collection.
Step a2, judge whether the subband power sum of all subbands in described subband candidate collection is greater than described P
mAX, if so, then perform step a4; Otherwise, perform step a3.
Step a3, by described subband candidate collection last subband delete, return step a2.
Step a4, the subband in described subband candidate collection is defined as the current subband for sending common control information.
Adopt such scheme to find out, the present invention effectively can control down transmitting power and be no more than maximum transmission power restriction.Here it should be noted that, although adopt in such scheme, 101 and 102 two steps are poly-illustrates concrete methods of realizings of the present invention, and above-mentioned two steps do not have execution sequence in time, just two kinds of parallel different situations.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a downlink transmission control method, is characterized in that, comprising:
As present frame T
xwhen the Downlink Control Information needing to issue user equipment (UE) is dedicated control information, judge whether the power headroom A of present frame is less than the power variation Δ P issued caused by described dedicated control information
dci, if so, then determine not issue described dedicated control information at present frame; Otherwise, when described dedicated control information is not, when opening Downlink Control Information, determine to issue described dedicated control information at present frame, when described dedicated control information is for opening Downlink Control Information, estimate the data transmission frames T that described unlatching Downlink Control Information is corresponding
y, and judge this data transmission frames T
ypower headroom B whether be less than and issue the power variation Δ P caused by business datum corresponding to described unlatching Downlink Control Information
data, if so, then determine not issue described unlatching Downlink Control Information at present frame, otherwise, determine to issue described unlatching Downlink Control Information at present frame;
As present frame T
xwhen needs are common control information to the Downlink Control Information that described UE issues, according to the maximum downstream transmitting power P preset
mAXwith the current subband power that there is each subband of resident users, determine the current subband for sending described common control information; Wherein, the subband power summation of determined subband is less than or equal to described maximum downstream transmitting power P
mAX.
2. method according to claim 1, is characterized in that, according to
determine described A, wherein, m is T
xcarry out the sub band number of list band transmission in all subbands that-1 frame takies, n is T
xthe sub band number of many subbands business is carried out, P in all subbands that-1 frame takies
ifor carry out the transmission of list band subband i on carry out the subband power of the subscriber equipment transmitted, P
rSfor reference signal power, Σ Δ P
dci_lfor present frame T
xthe described Δ P that all Downlink Control Information issued are corresponding
dcisum.
3. method according to claim 1, is characterized in that, according to
determine described B, wherein, z is T
ycarry out the sub band number of list band transmission in all subbands that-1 frame takies, w is T
ythe sub band number of many subbands business is carried out, P in all subbands that-1 frame takies
ifor carry out the transmission of list band subband i on carry out the subband power of the subscriber equipment transmitted, P
rSfor reference signal power, Σ Δ P
data_kfor present frame T
xthe described Δ P that all unlatching Downlink Control Information issued are corresponding
datasum.
4. method according to claim 1, is characterized in that, described Δ P
dcidefining method comprise:
When the subband that described dedicated control information is seized is idle subband, Δ P
dci=P
rE_j;
When the subband that described dedicated control information is seized is the subband of list band transfer of data, Δ P
dci=P
rE_j-P
rE_i;
When the subband that described dedicated control information is seized is the subband of many subband datas transmission, Δ P
dci=P
rE_j-P
rSs;
Wherein, described P
rE_jfor receiving the subband power of the UE of described dedicated control information; Described P
rE_ifor the subband that described dedicated control information is seized being preempted the subband power of subscriber equipment; Described P
rSfor reference signal power; S the subband seized of described dedicated control information is preempted the sub band number that subscriber equipment takies.
5. method according to claim 1, is characterized in that, described Δ P
datadefining method comprise:
If what described unlatching Downlink Control Information was opened is list band business, then
When the list band business that described unlatching Downlink Control Information is opened take be idle subband time, Δ P
data=P
rE_j; P
rE_jfor receiving the subband power of the UE of described unlatching Downlink Control Information,
When the list band business that described unlatching Downlink Control Information is opened take be the subband carrying out list band transfer of data time,
p
rE_ifor the described subband carrying out list band transfer of data being preempted the subband power of UE;
When the list band business that described unlatching Downlink Control Information is opened take be the subband carrying out the transmission of many subband datas time, Δ P
data=0;
If what described unlatching Downlink Control Information was opened is many subbands business, then
When many subbands business that described unlatching Downlink Control Information is opened take be idle subband time, Δ P
data=P
rS* m; Described P
rSfor reference signal power, described m is the sub band number that many subbands business of described unlatching Downlink Control Information unlatching takies;
When many subbands business that described unlatching Downlink Control Information is opened take be the subband carrying out list band transfer of data time,
described P
rE_ifor the list band i that described many subbands business is seized carrying out the subband power of the subscriber equipment of transfer of data; M is the number of sub-bands of described many subbands service needed, and h is single number of sub-bands that described many subbands business is seized;
When many subbands business that described unlatching Downlink Control Information is opened take be the subband carrying out the transmission of many subband datas time,
described n is the sub band number sum that the subscriber equipment that all subbands of seizing of many subbands business of opening of described unlatching Downlink Control Information carry out transfer of data takies.
6. method according to claim 1, is characterized in that, describedly determines that the current subband for sending common control information comprises:
A1, all subbands that there is resident users are added subband candidate collection;
A2, judge whether the subband power sum of all subbands in described subband candidate collection is greater than described P
mAX, if so, then perform step a4; Otherwise, perform step a3;
A3, by described subband candidate collection last subband delete, return step a2;
A4, the subband in described subband candidate collection is defined as the current subband for sending common control information.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310268152.5A CN104254120B (en) | 2013-06-28 | 2013-06-28 | A kind of control method of downlink transfer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310268152.5A CN104254120B (en) | 2013-06-28 | 2013-06-28 | A kind of control method of downlink transfer |
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| Publication Number | Publication Date |
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| CN104254120A true CN104254120A (en) | 2014-12-31 |
| CN104254120B CN104254120B (en) | 2018-02-02 |
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ID=52188558
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310268152.5A Expired - Fee Related CN104254120B (en) | 2013-06-28 | 2013-06-28 | A kind of control method of downlink transfer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018137601A1 (en) * | 2017-01-26 | 2018-08-02 | 华为技术有限公司 | Communication method and related device |
| CN113852431A (en) * | 2021-11-29 | 2021-12-28 | 罗森伯格技术有限公司 | Method, communication device and storage medium for determining pilot power |
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|---|---|---|---|---|
| CN101877905A (en) * | 2009-04-28 | 2010-11-03 | 大唐移动通信设备有限公司 | Method and device for controlling power of downlink control channel |
| WO2013000311A1 (en) * | 2011-06-29 | 2013-01-03 | 电信科学技术研究院 | Method and device for transmitting pdcch |
| CN103139886A (en) * | 2011-12-05 | 2013-06-05 | 中兴通讯股份有限公司 | Method for controlling transmitted power and base station controller |
-
2013
- 2013-06-28 CN CN201310268152.5A patent/CN104254120B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877905A (en) * | 2009-04-28 | 2010-11-03 | 大唐移动通信设备有限公司 | Method and device for controlling power of downlink control channel |
| WO2013000311A1 (en) * | 2011-06-29 | 2013-01-03 | 电信科学技术研究院 | Method and device for transmitting pdcch |
| CN103139886A (en) * | 2011-12-05 | 2013-06-05 | 中兴通讯股份有限公司 | Method for controlling transmitted power and base station controller |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018137601A1 (en) * | 2017-01-26 | 2018-08-02 | 华为技术有限公司 | Communication method and related device |
| US11172464B2 (en) | 2017-01-26 | 2021-11-09 | Huawei Technologies Co., Ltd. | Communication method and related apparatus |
| CN113852431A (en) * | 2021-11-29 | 2021-12-28 | 罗森伯格技术有限公司 | Method, communication device and storage medium for determining pilot power |
| CN113852431B (en) * | 2021-11-29 | 2022-02-22 | 罗森伯格技术有限公司 | Method, communication device and storage medium for determining pilot power |
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|---|---|
| CN104254120B (en) | 2018-02-02 |
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