CN102378255B - Method and device for improving transmission performance of physical downlink control channel (PDCCH) - Google Patents

Abstract

The invention discloses a method and a device for improving transmission performance of a physical downlink control channel (PDCCH). The method comprises the following steps of: determining the control channel element (CCE) minimum polymerization degree corresponding to a user terminal, and determining the CCE polymerization degree which is finally used according to the CCE minimum polymerization degree; determining the transmitting power of the PDCCH according to the CCE polymerization degree which is finally used; and adjusting the CCE polymerization degree which is finally used by the user terminal, a CCE position or the transmitting power of the PDCCH according to the frequency of dispatching the user terminal and the frequency of discontinuous transmission (DTX). In the method, reasonable initial PDCCH transmitting power and initial CCE polymerization degree are selected and block error ratio (BLER) statistics of the PDCCH is performed by using DTX so as to reflect the performance of the PDCCH, improve the performance of a scheduling user to certain extent, and reduce the interference with an edge user of a neighbor cell; and the method can be implemented easily and flexibly, and the performance can be improved by using lower computational load and complexity as cost.

Description

A kind of method and device that improves Physical Downlink Control Channel transmission performance

Technical field

The present invention relates to field of wireless communication, particularly relate to a kind of method and device that improves Physical Downlink Control Channel transmission performance.

Background technology

At present, 3GPP(3rd Generation Partnership Project, 3G (Third Generation) Moblie partner plan) the LTE(Long Term Evolution of tissue, Long Term Evolution) project is as the Long Term Evolution of a kind of 3G, is subject to extensive concern.The develop rapidly of digital communication system is had higher requirement to the reliability of data communication, yet, under severe channel circumstance, especially the Physical Downlink Control Channel in Cell Edge User is subject to the interference of adjacent cell user Physical Downlink Control Channel, has a strong impact on systematic function.Therefore, it is particularly important that efficient adaptive technology shows, and in LTE system, the self adaptation of down control channel can be carried out self adaptation by the code check of adjustment Downlink Control Information or the transmitting power of adjustment down control channel.

In prior art, conventionally adopt following two kinds of methods to improve down control channel performance:

First method, comprises the steps: for armed PDCCH(Physical Downlink Control Channel, Physical Downlink Control Channel) information dispatches, and obtains the initial resource allocation on PDCCH; In initial resource allocation on mark PDCCH by the invalid unit group of one or more consecutive invalid cell formations; And at least part of invalid unit group one or more end messages of repeat its transmission in distribution system.Terminal can combine the information of these repeat its transmission and obtain receiving gain, thereby improve, detects performance.

Second method, comprises the steps: to obtain the radio link quality information of subscriber equipment; According to radio link quality information, determine that link-quality under the radio link quality of subscriber equipment adjusts intervally, the encoding rate of PDCCH channel subscriber equipment being taken according to link-quality adjustment interval is adjusted.Thereby realize according to the actual state of current user equipment link-quality, the encoding rate of choose reasonable PDCCH channel, and then the utilization ratio of resource is controlled in raising, particularly, the embodiment of the present invention has improved the efficiency of PDCCH channel to user's transmitting scheduling information, therefore can improve the number of users of simultaneously dispatching in same TTI, reduce user data in the wait time delay of transmitter side.

But above-mentioned two kinds of methods have the following disadvantages again:

First method, is mainly repeat its transmission end message in invalid unit, but this method can increase the power of transmitting, has also increased the interference to adjacent cell edge customer.Second method, mainly to determine that by obtaining radio link quality information the link-quality adjustment under radio link quality is interval, then the code check of PDCCH channel is adjusted, the prerequisite of this method is to obtain the radio link quality information relevant to PDCCH, but the link circuit condition of PDCCH is very complicated in actual system, except having decline noise, also to be subject to the interference of adjacent cell, so it is more difficult accurately to obtain the link-quality of PDCCH.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of method and device that improves Physical Downlink Control Channel transmission performance, in order to solve the link-quality of PDCCH in prior art, is easily subject to the problem that adjacent cell is disturbed.

For solving the problems of the technologies described above, on the one hand, the invention provides a kind of method that improves Physical Downlink Control Channel transmission performance, described method comprises:

Determine the minimum degree of polymerization of the control channel Elements C CE that user terminal is corresponding, according to the minimum degree of polymerization of described CCE, determine the final CCE degree of polymerization of using;

According to the CCE degree of polymerization of described final use, determine the transmitting power of physical downlink control channel PDCCH;

The number of times being scheduled according to described user terminal and the number of times that occurs discontinuous transmitting DTX, adjust the finally transmitting power of the CCE degree of polymerization, CCE position or the PDCCH of use of described user terminal.

Wherein, determine the minimum degree of polymerization of the CCE that user terminal is corresponding, specifically comprise:

Judge whether described user terminal and base station are to carry out for the first time transfer of data, if not, the minimum degree of polymerization of CCE when the minimum degree of polymerization of described user terminal CCE is the last transfer of data of described user terminal;

If, further judge whether centered by described user terminal that user and channel quality indicator (CQI) are more than or equal to 14, if, whether the Downlink Control Information DCI that further judgement is selected is Format1, Format2 or Format2A, if, the minimum degree of polymerization of described user terminal CCE is for being 2, and if not, the minimum degree of polymerization of described user terminal CCE is 1;

If judge that described user terminal is less than 14 as edge customer or CQI, further judge whether the CQI of described user terminal is less than or equal to 5, if so, the minimum degree of polymerization of described user terminal CCE is 4; If not, the minimum degree of polymerization of described user terminal CCE is 2.

Wherein, determine the final CCE degree of polymerization of using, specifically comprise:

When the CCE degree of polymerization is the minimum degree of polymerization of described CCE, for described user terminal coupling CCE frequency domain resource, if described user terminal can not find coupling CCE frequency domain resource, increase the CCE degree of polymerization, continue as described user terminal coupling CCE frequency domain resource;

Described user terminal obtains the CCE degree of polymerization that the CCE degree of polymerization corresponding to coupling CCE frequency domain resource is final use.

Wherein, determine the transmitting power of described PDCCH, specifically comprise:

Judge whether described user terminal is edge customer, if so, the transmitting power of described PDCCH and the power of pilot signal equate;

If not, further judge whether the channel quality indicator (CQI) of described user terminal is more than or equal to threshold value, if judge that the CQI of described user terminal is more than or equal to threshold value, the transmitting power of described PDCCH remains unchanged;

If judge that the CQI of described user terminal is less than threshold value, further whether the final CCE degree of polymerization of using of judgement is more than or equal to 4, and if so, the transmitting power of described PDCCH is lowered 2db on original basis; If not, further whether the final CCE degree of polymerization of using of judgement equals 2, and if so, the transmitting power rate of described PDCCH is lowered 1db on original basis; If not, the transmitting power of described PDCCH remains unchanged.

Wherein, adjust the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of described user terminal, specifically comprise:

The CCE degree of polymerization that judges whether described final use is less than 8 and increase the frequency domain resource that has coupling after the final CCE degree of polymerization of using, and if so, increases the final CCE degree of polymerization of using;

If not, further whether judgement also has available CCE frequency domain resource in CCE option set, if judge there is available CCE frequency domain resource in CCE option set, in CCE option set, selects to be different from the available CCE of original CCE position;

If judge and there is no available CCE frequency domain resource in CCE option set, further judge that whether base station also has for the transmission power of distributing, and if so, increases the transmitting power of PDCCH; If not, stop dispatching described user terminal.

Wherein, when the ratio of the number of times being scheduled when number of times and the described user terminal of the described DTX of appearance is greater than 0.01, adjust the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of described user terminal.

Wherein, the number of times of the described DTX of appearance is added up by statistic window, and described statistic window can be for one or more, and described in each, statistic window has preset maximum; When the number of times of the appearance DTX of statistic window statistics described in any one reaches the predefined maximum of its correspondence, adjust the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of described user terminal.

On the other hand, the present invention also provides a kind of device that improves Physical Downlink Control Channel transmission performance, and described device comprises:

CCE degree of polymerization processing unit, for determining the minimum degree of polymerization of the control channel Elements C CE that user terminal is corresponding, according to the minimum degree of polymerization of described CCE, determines the final CCE degree of polymerization of using;

Transmitting power processing unit, for according to the CCE degree of polymerization of described final use, determines the transmitting power of physical downlink control channel PDCCH;

Adjustment unit, for the number of times being scheduled according to described user terminal and the number of times that occurs discontinuous transmitting DTX, adjusts the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of described user terminal.

Wherein, described device also comprises:

Block Error Rate processing unit, the ratio of the number of times being scheduled for the number of times that obtains the described DTX of appearance and described user terminal, when this ratio is greater than 0.01, by described adjustment unit, adjusted the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of described user terminal.

Wherein, described device also comprises:

Statistic window processing unit, for add up the number of times of the described DTX of appearance by statistic window, described statistic window can be for one or more, and described in each, statistic window has preset maximum; When the number of times of the appearance DTX of statistic window statistics described in any one reaches the predefined maximum of its correspondence, by described adjustment unit, adjusted the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of described user terminal.

Beneficial effect of the present invention is as follows:

The present invention is by selecting rational initial p DCCH transmitting power and the initial CCE degree of polymerization, utilize DTX to carry out the BLER statistics of PDCCH, the performance of reflection PDCCH, can improve the performance of dispatched users to a certain extent, and reduces the interference to adjacent cell edge customer; And realize comparatively simple and flexible, can take lower operand and complexity just to obtain the lifting of performance as cost.

Accompanying drawing explanation

Fig. 1 is a kind of flow chart that improves the method for Physical Downlink Control Channel transmission performance in the embodiment of the present invention;

Fig. 2 be in the embodiment of the present invention three statistic window be related to schematic diagram;

Fig. 3 is a kind of structural representation that improves the device of Physical Downlink Control Channel transmission performance in the embodiment of the present invention.

Embodiment

In order to solve the link-quality of PDCCH in prior art, be easily subject to the problem that adjacent cell is disturbed, the invention provides a kind of method and device that improves Physical Downlink Control Channel transmission performance, below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, does not limit the present invention.

The embodiment of the present invention relates to a kind of LTE Physical Downlink Control Channel adaptive approach.For PDCCH channel, the BLER(Block Error Rate of protocol requirement, Block Error Rate) below 1%.The in the situation that of existing resource, consider UE(User Equipment, user terminal) comprise CQI(Channel quality indication to the feedback information of base station, channel quality indication), ACK(ACKnowledgment, affirmative acknowledgement (ACK)) and NACK(Negative ACKnowledgment, negative acknowledge), and the order of code book and channel matrix, the CQI reporting due to UE can not well show the channel conditions of control channel, and the order of the code book reporting and channel matrix and PDCCH are irrelevant, so cannot obtain SINR(Signal to Interference plus Noise Ratio, Signal to Interference plus Noise Ratio) relation and between BLER.But can, by the number of times of statistics ACK and NACK, namely add up DTX(Discontinuous Transmission, discontinuous transmission) number of times add up the BLER of PDCCH.BLER adopts sliding window to calculate, if the size of window is N scheduling subframe, the sliding window of each scheduling subframe to front slide once, and on this basis, adjust the transmitting power of code check or the adjustment down control channel of Downlink Control Information, make the property retention of down control channel in the level of protocol requirement, thereby improve the performance of system.The self adaptation of wherein utilizing BLER to carry out PDCCH is to carry out statistical decision by one period of long period, for disturbing due to channel sudden change and adjacent cell PDCCH the situation that causes that Zhe community PDCCH performance is suddenlyd change, two less sliding windows of the sliding window of relative BLER in the present invention, have been introduced, utilize counter C_DTX1 and C_DTX2 to add up respectively the number of times of the DTX occurring in these two sliding windows, carry out the situation of adaptive control PDCCH performance sudden change in various degree.

As shown in Figure 1, the embodiment of the present invention relates to a kind of method that improves Physical Downlink Control Channel transmission performance, comprises the following steps:

Step S101, determines the minimum degree of polymerization of the control channel Elements C CE that user terminal is corresponding, according to the minimum degree of polymerization of CCE, determines the final CCE degree of polymerization of using.

First, for each scheduling UE arranges scheduling times counter C_Schedule, DTX counter C_DTX, DTX the number that counter C_DTX1 and C_DTX2 occur in corresponding statistic window with it being applied to statistics with two statistic window respectively.L and M represent respectively the maximum of DTX number of appearance in two sliding windows (statistic window).L and M can be empirical value, also can obtain by emulation.Three statistic window be related to schematic diagram as shown in Figure 2, wherein, if scheduling this UE once, C_Schedule adds 1, if C_Schedule equals the long N of BLER window, C_Schedule, C_DTX, C_DTX1 and C_DTX2 zero clearing are counted again;

Secondly, determine the minimum degree of polymerization of CCE that user terminal is corresponding, comprise the steps:

1) for new biography.According to the different DCI(Downlink Control Information that select, Downlink Control Information) and the different CCE degree of polymerization calculate code check, coordinate the broadband CQI reporting to determine the initial CCE minimum degree of polymerization.New biography refers to that base station and UE transmit data for the first time.

First judge user and its CQI >=14 centered by user terminal whether, if, centered by judging user terminal after user and CQI >=14, whether the DCI that also needs judgement to select is Format1, Format2 or Format2A, if, the minimum degree of polymerization of the CCE of user terminal is 2, because at this time code check is too high; If not, the minimum degree of polymerization of the CCE of this UE is 1 so, takies 1 CCE.

When judging that user terminal does not meet the condition of central user and its CQI >=14, further judge whether its CQI≤5, if so, the minimum degree of polymerization of the CCE of this UE is that 4(takies 4 CCE so).If not, the minimum degree of polymerization of the CCE of this UE is that 2(takies 2 CCE).

It is to be noted: in the present invention, user terminal belongs to central user or edge customer, belongs to known conditions, and the present invention is no longer described in detail.

2) for re-transmission.The PDCCH form of this use is the same with last time, and the minimum degree of polymerization of CCE is constant.That is: the minimum degree of polymerization of CCE when the minimum degree of polymerization of user terminal CCE is the last transfer of data of this user terminal.Re-transmission refers to that the last transfer of data of base station and UE does not have transmission success, goes wrong, and in the time of cannot resolving, again carries out transfer of data.

After the minimum degree of polymerization of definite CCE, also need to determine the final CCE degree of polymerization of using.

After having determined the minimum degree of polymerization of CCE, so just from the minimum degree of polymerization of this CCE, for this UE finds the CCE frequency domain resource of mating, if can not find the frequency domain resource of coupling under this CCE degree of polymerization, increase so the CCE degree of polymerization (value of the CCE degree of polymerization is 1,2,4,8), carry out again frequency domain resource coupling, until the CCE degree of polymerization is 8.User terminal obtains the CCE degree of polymerization that the CCE degree of polymerization corresponding to coupling CCE frequency domain resource is final use.If the CCE degree of polymerization is 8 o'clock, still can not find the frequency domain resource of coupling, so, this UE is no longer dispatched, wait next constantly scheduling again.

Step S102, according to the CCE degree of polymerization of final use, determines the transmitting power of PDCCH;

Determine PDCCH transmitting power (Initial Trans).Comprise the following steps:

First, judge whether this user terminal is edge customer, if edge customer: because the CQI of edge customer is difficult to the channel conditions of reflection control channel, so at this time first do not carry out power division, make the shared RE(Resources Element of PDCCH, resource element) power and the power of the shared RE of reference signal (pilot signal) equate.

If not edge customer, be central user, because be subject to the interference of adjacent cell less, at this moment by the broadband CQI reporting, can show to a certain extent the channel conditions of control channel.According to the broadband CQI reporting, in conjunction with the last CCE degree of polymerization of using, determine power offset values, will be smaller to the interference of the edge customer of adjacent cell because reduce the power of some central user.

After judging that user terminal is central user, further judge whether the CQI>=CQI_Threshold of user terminal, and the final CCE degree of polymerization of using is more than or equal to 4, if, poweroffset=-2db, that is: the transmitting power of the PDCCH of user terminal is lowered 2db on original basis; If not, the final CQI>=CQI_Threshold that judges whether again user terminal, and the final CCE degree of polymerization of using equals 2, if, poweroffset=-1db, that is: the transmitting power of the PDCCH of user terminal is lowered 1db on original basis; Otherwise, poweroffset=0db, that is: the transmitting power of the PDCCH of user terminal remains unchanged.

Wherein CQI_Threshold is original threshold value of setting.It can be empirical value, also can obtain according to the PDCCH performance curve of emulation, poweroffset represents the power offset values of PDCCH relative reference signal (pilot signal), and final definite transmitting power is exactly to add power offset values on the basis of original power.

Step S103, the number of times being scheduled according to user terminal and the number of times of DTX, adjust the finally transmitting power of the CCE degree of polymerization, CCE position or the PDCCH of use of user terminal.

First, timer and statistic window need to be upgraded.

If UE is scheduled, dispatches counter C_Schedule and add 1.If there is a DTX, C_DTX, C_DTX1 and C_DTX2 add 1.

If C_Schedule equals N, all counter O resets.

If C_Schedule mould L equals 0, represent that counter C_DTX1 reaches maximum, counter C_DTX1 zero clearing.

If C_Schedule mould M equals 0, represent that counter C_DTX2 reaches maximum, counter C_DTX2 zero clearing.

According to formula (1), calculate BLER:

$\mathrm{BLER}=\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\left(\mathrm{DTX}\right)}{N}*100\%=\frac{C\_\mathrm{DTX}}{C\_\mathrm{Schedul}}---\left(1\right)$

Wherein, represent that the number of times sum of DTX appears when being scheduled to the N time for the first time in user terminal.For example, user terminal is scheduled 100 times, and DTX has wherein only appearred one time in N=100: equal 1 and 99 0 sum.BLER=1/100=0.01。

For adding up the statistic window of the number of times that occurs DTX, can be one, also can be for a plurality of, arrange a plurality of, can, by different maximums is set, set the time range of statistic window statistics, in different time ranges, there is the number of times of DTX in statistics, just can tackle the slow situation that becomes and suddenly change of PDCCH performance, and then according to different situations, carry out different adjustment.But, increase the quantity of statistic window, can increase operand and complexity, therefore, need to choose a suitable numerical value.Test shows, three statistic window C_DTX, C_DTX1 and C_DTX2 is set for better selection.

When the number of times of the appearance DTX of any one statistic window statistics reaches the predefined maximum of its correspondence, or during BLER>0.01, adjust the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of user terminal.If i.e.: C_DTX1=L or C_DTX2=M or BLER>0.01 carry out PDCCH adaptive process as follows:

1) if the CCE degree of polymerization of current use (the CCE degree of polymerization of the final use of determining above) is less than 8, and there is corresponding frequency domain resource after increasing the CCE degree of polymerization, increase the CCE degree of polymerization (can value be 1,2,4,8, increase progressively successively in increase process), otherwise turn next step;

2), if also have the frequency domain resource of other available CCE in CCE option set (the frequency domain resource pond that can select), in option set, select to be different from the available CCE of original CCE position, otherwise turn next step;

3) if also have remaining power, also have distributable power, increase PDCCH transmitting power, on the basis of original watt level, increase the power excursion of Delta db.The numerical value of Delta can obtain by link simulation in advance.If no, stop dispatching this user terminal, wait for scheduling next time.

4) upgrade the CCE degree of polymerization, the transmitting power of CCE position and PDCCH.

PDCCH Channel Processing flow process comprises: chnnel coding, and constellation modulation, spectrum-spreading and scrambling, layer mapping, precoding, the processing such as resource element mapping, wherein the power of PDCCH is adjusted at constellation modulation module and carries out.

To sum up, the present invention has provided a kind of adaptive approach of down control channel, by utilizing the performance of DTX statistics PDCCH, and by rational windowing statistical technique, has realized PDCCH Adaptive Transmission, has improved to a certain extent the reliability of system.

In addition, as shown in Figure 3, the embodiment of the present invention also relates to a kind of device that improves Physical Downlink Control Channel transmission performance, comprising:

CCE degree of polymerization processing unit 201, for determining the minimum degree of polymerization of the control channel Elements C CE that user terminal is corresponding, according to the minimum degree of polymerization of CCE, determines the final CCE degree of polymerization of using;

CCE degree of polymerization processing unit 201 is determined the minimum degree of polymerization of CCE that user terminal is corresponding, specific as follows:

Judge whether user terminal and base station are to carry out for the first time transfer of data, if not, the minimum degree of polymerization of CCE when the minimum degree of polymerization of user terminal CCE is the last transfer of data of user terminal;

If so, further judge whether centered by user terminal that user and channel quality indicator (CQI) are more than or equal to 14, if so, the minimum degree of polymerization of user terminal CCE is 1;

If not, further judge whether the CQI of user terminal is less than or equal to 5, if so, the minimum degree of polymerization of user terminal CCE is 4; If not, the minimum degree of polymerization of user terminal CCE is 2.

CCE degree of polymerization processing unit 201 is determined the final CCE degree of polymerization of using, specific as follows:

When the CCE degree of polymerization is the minimum degree of polymerization of CCE, for user terminal coupling CCE frequency domain resource, if user terminal can not find coupling CCE frequency domain resource, increase the CCE degree of polymerization, continue as user terminal coupling CCE frequency domain resource;

User terminal obtains the CCE degree of polymerization that the CCE degree of polymerization corresponding to coupling CCE frequency domain resource is final use.

Transmitting power processing unit 202, for according to the final CCE degree of polymerization of using, determines the transmitting power of physical downlink control channel PDCCH;

Transmitting power processing unit 202 is determined the transmitting power of PDCCH, specific as follows:

Judge whether user terminal is edge customer, if so, the transmitting power of PDCCH and the power of pilot signal equate;

If not, further judge whether that the channel quality indicator (CQI) of user terminal is more than or equal to threshold value, and the final CCE degree of polymerization of using is more than or equal to 4, if so, the transmitting power of the PDCCH of user terminal is lowered 2db on original basis;

If not, further judge whether that CQI is more than or equal to threshold value, and the final CCE degree of polymerization of using equals 2, if so, the transmitting power of the PDCCH of user terminal is lowered 1db on original basis; If not, the transmitting power rate of the PDCCH of user terminal remains unchanged.

Adjustment unit 203, for the number of times being scheduled according to user terminal and the number of times that occurs discontinuous transmitting DTX, adjusts the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of user terminal.

Adjustment unit 203 is adjusted the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of user terminal, specific as follows:

Judge whether that the final CCE degree of polymerization of using is less than 8 and increase the frequency domain resource that has coupling after the final CCE degree of polymerization of using, and if so, increases the final CCE degree of polymerization of using;

If not, further whether judgement also has available CCE frequency domain resource in CCE option set, if so, in CCE option set, selects to be different from the available CCE of original CCE position;

If not, further judge that whether base station also has for the transmission power of distributing, and if so, increases the transmitting power of PDCCH; If not, stop scheduling user terminal.

In addition, device also comprises:

Block Error Rate processing unit 204, for obtaining the ratio of the number of times that the number of times that occurs DTX and user terminal be scheduled, when this ratio is greater than 0.01, is adjusted the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of user terminal by adjustment unit.

Statistic window processing unit 205, for add up the number of times that occurs DTX by statistic window, statistic window can be for one or more, and each statistic window has preset maximum; When the number of times of the appearance DTX of any one statistic window statistics reaches the predefined maximum of its correspondence, by adjustment unit, adjusted the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of user terminal.

As can be seen from the above-described embodiment, the present invention is by selecting rational initial p DCCH transmitting power and the initial CCE degree of polymerization, utilize DTX to carry out the BLER statistics of PDCCH, the performance of reflection PDCCH, can improve to a certain extent the performance of dispatched users, and reduce the interference to adjacent cell edge customer; And realize comparatively simple and flexible, can take lower operand and complexity just to obtain the lifting of performance as cost.

Although be example object, the preferred embodiments of the present invention are disclosed, it is also possible those skilled in the art will recognize various improvement, increase and replacement, therefore, scope of the present invention should be not limited to above-described embodiment.

Claims (10)

1. a method that improves Physical Downlink Control Channel transmission performance, is characterized in that, described method comprises:

Determine the minimum degree of polymerization of the control channel Elements C CE that user terminal is corresponding, according to the minimum degree of polymerization of described CCE, determine the final CCE degree of polymerization of using;

According to the CCE degree of polymerization of described final use, determine the transmitting power of physical downlink control channel PDCCH;

The number of times being scheduled according to described user terminal and the number of times that occurs discontinuous transmitting DTX, adjust the finally transmitting power of the CCE degree of polymerization, CCE position or the PDCCH of use of described user terminal.

2. the method for raising Physical Downlink Control Channel transmission performance as claimed in claim 1, is characterized in that, determines the minimum degree of polymerization of the CCE that user terminal is corresponding, specifically comprises:

Judge whether described user terminal and base station are to carry out for the first time transfer of data, if not, the minimum degree of polymerization of CCE when the minimum degree of polymerization of described user terminal CCE is the last transfer of data of described user terminal;

If, further judge whether centered by described user terminal that user and channel quality indicator (CQI) are more than or equal to 14, if, whether the Downlink Control Information DCI that further judgement is selected is Format1, Format2 or Format2A, if, the minimum degree of polymerization of described user terminal CCE is for being 2, and if not, the minimum degree of polymerization of described user terminal CCE is 1;

If judge that described user terminal is less than 14 as edge customer or CQI, further judge whether the CQI of described user terminal is less than or equal to 5, if so, the minimum degree of polymerization of described user terminal CCE is 4; If not, the minimum degree of polymerization of described user terminal CCE is 2.

3. the method for raising Physical Downlink Control Channel transmission performance as claimed in claim 1, is characterized in that, determines the final CCE degree of polymerization of using, and specifically comprises:

When the CCE degree of polymerization is the minimum degree of polymerization of described CCE, for described user terminal coupling CCE frequency domain resource, if described user terminal can not find coupling CCE frequency domain resource, increase the CCE degree of polymerization, continue as described user terminal coupling CCE frequency domain resource;

Described user terminal obtains the CCE degree of polymerization that the CCE degree of polymerization corresponding to coupling CCE frequency domain resource is final use.

4. the method for raising Physical Downlink Control Channel transmission performance as claimed in claim 1, is characterized in that, determines the transmitting power of described PDCCH, specifically comprises:

Judge whether described user terminal is edge customer, if so, the transmitting power of described PDCCH and the power of pilot signal equate;

If not, further judge whether the channel quality indicator (CQI) of described user terminal is more than or equal to threshold value, if judge that the CQI of described user terminal is more than or equal to threshold value, the transmitting power of described PDCCH remains unchanged;

If judge that the CQI of described user terminal is less than threshold value, further whether the final CCE degree of polymerization of using of judgement is more than or equal to 4, and if so, the transmitting power of described PDCCH is lowered 2db on original basis; If not, further whether the final CCE degree of polymerization of using of judgement equals 2, and if so, the transmitting power rate of described PDCCH is lowered 1db on original basis; If not, the transmitting power of described PDCCH remains unchanged.

5. the method for raising Physical Downlink Control Channel transmission performance as claimed in claim 1, is characterized in that, adjusts the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of described user terminal, specifically comprises:

The CCE degree of polymerization that judges whether described final use is less than 8 and increase the frequency domain resource that has coupling after the final CCE degree of polymerization of using, and if so, increases the final CCE degree of polymerization of using;

If not, further whether judgement also has available CCE frequency domain resource in CCE option set, if judge there is available CCE frequency domain resource in CCE option set, in CCE option set, selects to be different from the available CCE of original CCE position;

If judge and there is no available CCE frequency domain resource in CCE option set, further judge that whether base station also has for the transmission power of distributing, and if so, increases the transmitting power of PDCCH; If not, stop dispatching described user terminal.

6. the method for raising Physical Downlink Control Channel transmission performance as claimed in claim 1, it is characterized in that, when the ratio of the number of times being scheduled when the number of times of the described DTX of appearance and described user terminal is greater than 0.01, adjust the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of described user terminal.

7. the method for raising Physical Downlink Control Channel transmission performance as claimed in claim 1, it is characterized in that, the number of times of the described DTX of appearance is added up by statistic window, and described statistic window can be for one or more, and described in each, statistic window has preset maximum; When the number of times of the appearance DTX of statistic window statistics described in any one reaches the predefined maximum of its correspondence, adjust the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of described user terminal.

8. a device that improves Physical Downlink Control Channel transmission performance, is characterized in that, described device comprises:

CCE degree of polymerization processing unit, for determining the minimum degree of polymerization of the control channel Elements C CE that user terminal is corresponding, according to the minimum degree of polymerization of described CCE, determines the final CCE degree of polymerization of using;

Transmitting power processing unit, for according to the CCE degree of polymerization of described final use, determines the transmitting power of physical downlink control channel PDCCH;

Adjustment unit, for the number of times being scheduled according to described user terminal and the number of times that occurs discontinuous transmitting DTX, adjusts the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of described user terminal.

9. the device of raising Physical Downlink Control Channel transmission performance as claimed in claim 8, is characterized in that, described device also comprises:

Block Error Rate processing unit, the ratio of the number of times being scheduled for the number of times that obtains the described DTX of appearance and described user terminal, when this ratio is greater than 0.01, by described adjustment unit, adjusted the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of described user terminal.

10. the device of raising Physical Downlink Control Channel transmission performance as claimed in claim 8, is characterized in that, described device also comprises:

Statistic window processing unit, for add up the number of times of the described DTX of appearance by statistic window, described statistic window can be for one or more, and described in each, statistic window has preset maximum; When the number of times of the appearance DTX of statistic window statistics described in any one reaches the predefined maximum of its correspondence, by described adjustment unit, adjusted the transmitting power of the final CCE degree of polymerization, CCE position or the PDCCH using of described user terminal.