CN102378255A - Method and device for improving transmission performance of physical downlink control channel (PDCCH) - Google Patents
Method and device for improving transmission performance of physical downlink control channel (PDCCH) Download PDFInfo
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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
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for improving transmission performance of a physical downlink control channel.
Background
Currently, the LTE (Long Term Evolution) Project of the 3GPP (3rd Generation Partnership Project) organization is receiving attention as a 3G Long Term Evolution technology. The rapid development of digital communication systems puts higher demands on the reliability of data communication, however, in a severe channel environment, especially the physical downlink control channel of a cell edge user is interfered by the physical downlink control channel of a user in an adjacent cell, and the system performance is seriously affected. Therefore, an effective adaptive technique is particularly important, and in the LTE system, the adaptation of the downlink control channel can be performed by adjusting the code rate of the downlink control information or adjusting the transmission power of the downlink control channel.
In the prior art, the following two methods are generally adopted to improve the performance of a downlink control channel:
a first method comprising the steps of: scheduling Physical Downlink Control Channel (PDCCH) information to be transmitted, and acquiring initial resource allocation on the PDCCH; marking an invalid unit group consisting of one or more continuous invalid units in initial resource allocation on the PDCCH; and allocating one or more terminal information repeatedly transmitted in the system in at least a part of the invalid unit group. The terminal can combine the repeatedly transmitted information to obtain a reception gain, thereby improving detection performance.
A second method, comprising the steps of: acquiring wireless link quality information of user equipment; and determining a link quality adjustment interval to which the wireless link quality of the user equipment belongs according to the wireless link quality information, and adjusting the coding rate of the PDCCH (physical downlink control channel) occupied by the user equipment according to the link quality adjustment interval. Therefore, the coding rate of the PDCCH is reasonably selected according to the actual condition of the link quality of the current user equipment, and the utilization efficiency of control resources is further improved.
However, the two methods have the following defects:
the first method, mainly repeatedly transmitting terminal information on invalid cells, increases the transmission power and also increases interference to users at the edge of neighboring cells. The second method mainly determines a link quality adjustment interval to which the quality of a wireless link belongs by acquiring quality information of the wireless link, and then adjusts a code rate of a PDCCH (physical Downlink control channel) channel, and the method is based on the premise that the quality information of the wireless link related to the PDCCH is acquired, but in an actual system, the link condition of the PDCCH is very complex, and the PDCCH is interfered by an adjacent cell except fading noise, so that the accurate acquisition of the link quality of the PDCCH is difficult.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and an apparatus for improving the transmission performance of a physical downlink control channel, so as to solve the problem in the prior art that the link quality of a PDCCH is easily interfered by an adjacent cell.
In order to solve the above technical problem, in one aspect, the present invention provides a method for improving transmission performance of a physical downlink control channel, where the method includes:
determining the minimum polymerization degree of a Control Channel Element (CCE) corresponding to a user terminal, and determining the CCE polymerization degree to be finally used according to the minimum polymerization degree of the CCE;
determining the transmitting power of a Physical Downlink Control Channel (PDCCH) according to the CCE polymerization degree finally used;
and adjusting the CCE polymerization degree, the CCE position or the transmission power of the PDCCH finally used by the user terminal according to the scheduled times of the user terminal and the times of discontinuous reception (DTX).
The determining the minimum aggregation level of the CCE corresponding to the user equipment specifically includes:
judging whether the user terminal and the base station carry out data transmission for the first time, if not, the minimum polymerization degree of the CCE of the user terminal is the CCE minimum polymerization degree when the user terminal carries out data transmission for the last time;
if so, further judging whether the user terminal is a central user and the channel quality indicator CQI is greater than or equal to 14, if so, further judging whether the selected downlink control information DCI is Format1, Format2 or Format2A, if so, the minimum polymerization degree of the CCE of the user terminal is 2, and if not, the minimum polymerization degree of the CCE of the user terminal is 1;
if the user terminal is judged to be an edge user or the CQI is less than 14, further judging whether the CQI of the user terminal is less than or equal to 5, if so, the minimum polymerization degree of the CCE of the user terminal is 4; and if not, the minimum polymerization degree of the CCE of the user terminal is 2.
Determining the CCE polymerization degree finally used specifically comprises the following steps:
when the CCE polymerization degree is the minimum polymerization degree of the CCE, matching CCE frequency domain resources for the user terminal, if the user terminal cannot find the matched CCE frequency domain resources, increasing the CCE polymerization degree, and continuing to match the CCE frequency domain resources for the user terminal;
and the CCE polymerization degree corresponding to the matched CCE frequency domain resource obtained by the user terminal is the CCE polymerization degree finally used.
Wherein, determining the transmission power of the PDCCH specifically includes:
judging whether the user terminal is an edge user, if so, the transmitting power of the PDCCH is equal to the power of a pilot signal;
if not, further judging whether the Channel Quality Indicator (CQI) of the user terminal is larger than or equal to a threshold value, and if so, keeping the transmitting power of the PDCCH unchanged;
if the CQI of the user terminal is judged to be smaller than the threshold value, further judging whether the CCE polymerization degree finally used is larger than or equal to 4, if so, reducing the transmission power of the PDCCH by 2db on the original basis; if not, further judging whether the CCE polymerization degree finally used is equal to 2, if so, reducing the transmission power rate of the PDCCH by 1db on the original basis; and if not, keeping the transmission power of the PDCCH unchanged.
Adjusting the CCE aggregation level, the CCE location, or the transmission power of the PDCCH that is ultimately used by the user equipment, specifically includes:
judging whether the CCE polymerization degree finally used is less than 8 and whether matched frequency domain resources exist after the CCE polymerization degree finally used is increased, if so, increasing the CCE polymerization degree finally used;
if not, further judging whether available CCE frequency domain resources still exist in the CCE selectable set, and if so, selecting available CCEs with different positions from the original CCE positions in the CCE selectable set;
if the CCE frequency domain resources which are not available in the CCE selectable set are judged, whether the base station has the residual transmitting power for allocation is further judged, and if so, the transmitting power of the PDCCH is increased; and if not, stopping scheduling the user terminal.
When the ratio of the DTX occurrence times to the scheduled times of the user terminal is more than 0.01, adjusting the CCE polymerization degree, the CCE position or the transmission power of the PDCCH finally used by the user terminal.
Counting the times of DTX occurrence through one or more statistical windows, wherein each statistical window is preset with a maximum value; and when the DTX occurrence frequency counted by any one of the statistical windows reaches the corresponding preset maximum value, adjusting the CCE polymerization degree, the CCE position or the transmission power of the PDCCH finally used by the user terminal.
In another aspect, the present invention further provides a device for improving the transmission performance of a physical downlink control channel, where the device includes:
the CCE polymerization degree processing unit is used for determining the minimum polymerization degree of a Control Channel Element (CCE) corresponding to the user terminal and determining the CCE polymerization degree to be finally used according to the minimum polymerization degree of the CCE;
a transmission power processing unit, configured to determine, according to the CCE aggregation level finally used, transmission power of a physical downlink control channel PDCCH;
and the adjusting unit is used for adjusting the CCE polymerization degree, the CCE position or the transmitting power of the PDCCH finally used by the user terminal according to the scheduled times and the times of discontinuous reception (DTX) occurrence of the user terminal.
Wherein the apparatus further comprises:
and the block error rate processing unit is used for acquiring the ratio of the times of DTX occurrence to the times of scheduling of the user terminal, and when the ratio is greater than 0.01, the adjusting unit adjusts the CCE polymerization degree, the CCE position or the transmission power of the PDCCH finally used by the user terminal.
Wherein the apparatus further comprises:
a statistic window processing unit, configured to count the number of times of DTX occurrence through a statistic window, where the number of the statistic window may be one or more, and each statistic window is preset with a maximum value; when the number of times of DTX occurrence counted by any one of the statistical windows reaches the corresponding preset maximum value, the adjusting unit adjusts the CCE polymerization degree, the CCE position or the transmission power of the PDCCH finally used by the user terminal.
The invention has the following beneficial effects:
the invention selects reasonable initial PDCCH transmitting power and initial CCE polymerization degree, utilizes DTX to carry out BLER statistics of the PDCCH, reflects the performance of the PDCCH, can improve the performance of a scheduling user to a certain extent, and reduces the interference to the edge user of an adjacent cell; the method is simple and flexible to realize, and the performance can be improved at the cost of lower computation amount and complexity.
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Fig. 1 is a flowchart of a method for improving transmission performance of a physical downlink control channel according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating the relationship of three statistical windows according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an apparatus for improving transmission performance of a physical downlink control channel in an embodiment of the present invention.
Detailed Description
In order to solve the problem that the link quality of the PDCCH is easily interfered by the neighboring cell in the prior art, the present invention provides a method and an apparatus for improving the transmission performance of a physical downlink control channel, and the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The embodiment of the invention relates to an LTE physical downlink control channel self-adaption method. For the PDCCH channel, the BLER (Block Error Rate) required by the protocol is below 1%. In the case of the existing resources, considering that feedback information from a UE (User Equipment) to a base station includes CQI (Channel quality indication), ACK (acknowledgement) and NACK (Negative acknowledgement), and the rank of a codebook and a Channel matrix, since the CQI reported by the UE cannot well indicate the Channel condition of a control Channel, and the rank of the reported codebook and Channel matrix is irrelevant to the PDCCH, a relationship between SINR (Signal to interference plus Noise Ratio) and BLER cannot be obtained. However, the BLER of the PDCCH may be counted by counting the number of ACKs and NACKs, that is, the number of DTX (discontinuous reception). BLER is calculated by adopting a sliding window, the size of the window is set to be N scheduling sub-frames, the sliding window of each scheduling sub-frame slides forwards once, and the code rate of downlink control information or the transmitting power of a downlink control channel is adjusted based on the sliding window, so that the performance of the downlink control channel is kept at the level required by a protocol, and the performance of a system is improved. The adaptive control of PDCCH by BLER is to carry out statistical judgment for a long time, and aiming at the condition of sudden change of PDCCH performance of a cell caused by channel sudden change and adjacent cell PDCCH interference, the invention introduces two sliding windows which are relatively small to BLER sliding windows, and counters C _ DTX1 and C _ DTX2 are used for respectively counting the times of DTX appearing in the two sliding windows, so as to adaptively control the condition of sudden change of PDCCH performance at different degrees.
As shown in fig. 1, an embodiment of the present invention relates to a method for improving transmission performance of a physical downlink control channel, including the following steps:
step S101, determining the minimum aggregation level of the control channel element CCE corresponding to the user terminal, and determining the CCE aggregation level to be finally used according to the minimum aggregation level of the CCE.
Firstly, a scheduling frequency counter C _ Schedule, a DTX counter C _ DTX, a counter C _ DTX1 and a counter C _ DTX2 are respectively arranged for each scheduled UE, and are respectively corresponding to two statistical windows for counting the DTX frequency occurring in the corresponding statistical window. L and M represent the maximum of the number of DTX's occurring in the two sliding windows (statistical windows), respectively. L and M can be empirical values or can be obtained through simulation. The relationship diagram of the three statistical windows is shown in fig. 2, wherein, if the UE is scheduled once, C _ Schedule is added with 1, if C _ Schedule is equal to BLER window length N, C _ Schedule, C _ DTX1 and C _ DTX2 are cleared and recounted;
secondly, determining the minimum CCE polymerization degree corresponding to the user terminal, comprising the following steps:
1) for new transmissions. And calculating to obtain code rates according to different selected DCIs (Downlink Control Information) and different CCE polymerization degrees, and determining the initial CCE minimum polymerization degree by matching with the reported wideband CQI. The new transmission refers to the data transmission between the base station and the UE for the first time.
Firstly, judging whether the user terminal is a central user and the CQI is not less than 14, if so, namely after judging that the user terminal is the central user and the CQI is not less than 14, judging whether the selected DCI is Format1, Format2 or Format2A, if so, the minimum polymerization degree of the CCE of the user terminal is 2, and the code rate is too high; if not, the CCE minimum aggregation level of the UE is 1, namely 1 CCE is occupied.
When the user terminal is judged not to meet the conditions that the center user and the CQI of the user terminal is larger than or equal to 14, whether the CQI of the user terminal is smaller than or equal to 5 is further judged, and if so, the minimum polymerization degree of the CCE of the UE is 4 (namely, the CCE occupies 4). If not, the minimum aggregation level of the CCEs of the UE is 2 (namely, 2 CCEs are occupied).
It should be noted that: in the present invention, whether the user terminal belongs to a central user or an edge user belongs to a known condition, and the present invention will not be described in detail.
2) For retransmission. The PDCCH format used at this time is the same as that used at the last time, and the minimum polymerization degree of the CCE is unchanged. Namely: the minimum aggregation level of the CCE of the user terminal is the minimum aggregation level of the CCE when the user terminal transmits data last time. The retransmission means that the data transmission between the base station and the UE is performed again when the last data transmission is unsuccessful, a problem occurs, and the data transmission cannot be analyzed.
After determining the CCE minimum aggregation level, it is also necessary to determine the CCE aggregation level to be finally used.
After the CCE minimum polymerization degree is determined, searching matched CCE frequency domain resources for the UE from the CCE minimum polymerization degree, if the matched frequency domain resources cannot be found under the CCE polymerization degree, increasing the CCE polymerization degree (the value of the CCE polymerization degree is 1, 2, 4 and 8), and then performing frequency domain resource matching until the CCE polymerization degree is 8. And the CCE polymerization degree corresponding to the matched CCE frequency domain resource obtained by the user terminal is the CCE polymerization degree finally used. If the matched frequency domain resource can not be found when the CCE polymerization degree is 8, then the UE is not scheduled any more, and the next time is scheduled again.
Step S102, determining the transmitting power of the PDCCH according to the CCE polymerization degree finally used;
PDCCH transmission power (initial transmission power) is determined. The method comprises the following steps:
firstly, judging whether the user terminal is an edge user, if so, judging whether the user terminal is the edge user: since the CQI of the edge user hardly reflects the channel condition of the control channel, no power allocation is performed at this time, so that the power of the RE (resource Element) occupied by the PDCCH is equal to the power of the RE occupied by the reference signal (pilot signal).
If the user is not an edge user, namely a center user, because the interference from the adjacent cell is small, the reported wideband CQI can indicate the channel condition of the control channel to some extent. And determining a power offset value according to the reported wideband CQI and the last used CCE aggregation level, wherein the interference of reducing the power of some central users to the edge users of the adjacent cell is smaller.
After determining that the user terminal is the center user, further determining whether the CQI of the user terminal is ═ CQI _ Threshold, and the CCE aggregation level finally used is greater than or equal to 4, and if so, poweroffset ═ 2db, that is: the transmitting power of the PDCCH of the user terminal is reduced by 2db on the original basis; if not, finally judging whether the CQI of the user terminal is > -CQI _ Threshold, and the CCE polymerization degree finally used is equal to 2, if so, the poweroffset is ═ 1db, namely: the transmitting power of the PDCCH of the user terminal is reduced by 1db on the original basis; otherwise, poweroffset is 0db, i.e.: the transmission power of the PDCCH of the user terminal remains unchanged.
Wherein CQI _ Threshold is a previously set Threshold value. The power offset can be an empirical value or obtained according to a simulated PDCCH performance curve, and represents a power offset value of the PDCCH with respect to a reference signal (pilot signal), and the finally determined transmission power is the power offset value added on the basis of the original power.
Step S103, according to the scheduled times and DTX times of the user terminal, adjusting the CCE polymerization degree, the CCE position or the transmission power of the PDCCH finally used by the user terminal.
First, the timer and the statistics window need to be updated.
If the UE is scheduled, the scheduling counter C _ Schedule is incremented by 1. If a DTX occurs once, 1 is added to all of the C _ DTX, C _ DTX1 and C _ DTX 2.
If C _ Schedule is equal to N, all counters are cleared.
If the C _ Schedule modulo L is equal to 0, indicating that the counter C _ DTX1 has reached a maximum value, the counter C _ DTX1 is cleared.
If the C _ Schedule modulus M is equal to 0, indicating that the counter C _ DTX2 has reached a maximum value, the counter C _ DTX2 is cleared.
BLER is calculated according to equation (1):
wherein,representing the sum of the times that DTX occurs when the user terminal is scheduled from the first to the nth time. For example, a user terminal is scheduled 100 times, N is 100, where only one DTX occurs, then:i.e. equal to the sum of 1 and 99 0 s. BLER, 1/100, 0.01.
The counting window used for counting the times of DTX occurrence can be one, or a plurality of, and is set in a plurality of ways, the counting time range of the counting window can be set by setting different maximum values, in different time ranges, the times of DTX occurrence can be counted, the conditions of slow change and mutation of PDCCH performance can be dealt with, and then different adjustments can be carried out according to different conditions. However, increasing the number of statistical windows increases the amount of computation and complexity, and therefore, a suitable value needs to be selected. Experiments have shown that setting three statistical windows C _ DTX, C _ DTX1 and C _ DTX2 is a better choice.
And when the DTX occurrence frequency counted by any one statistical window reaches the corresponding preset maximum value or the BLER is more than 0.01, adjusting the CCE polymerization degree, the CCE position or the transmission power of the PDCCH finally used by the user terminal. Namely: if C _ DTX1 is L or C _ DTX2 is M or BLER > 0.01, the PDCCH adaptation procedure is performed as follows:
1) if the currently used CCE polymerization degree (namely the last used CCE polymerization degree determined above) is less than 8 and corresponding frequency domain resources exist after the CCE polymerization degree is increased, increasing the CCE polymerization degree (the value can be 1, 2, 4 and 8, and the increment is carried out in the increasing process in sequence), and if not, turning to the next step;
2) if other available CCE frequency domain resources exist in the CCE selectable set (the selectable frequency domain resource pool), selecting the available CCE different from the original CCE position in the selectable set, and if not, turning to the next step;
3) if the remaining power, namely the power available for allocation, exists, the PDCCH transmission power is increased, and the power offset of Delta db is increased on the basis of the original power. The Delta value can be obtained in advance through link simulation. If not, the user terminal is stopped to be scheduled and waits for the next scheduling.
4) And updating the CCE polymerization degree, the CCE position and the transmission power of the PDCCH.
The PDCCH channel processing flow comprises the following steps: the method comprises the steps of channel coding, constellation modulation, spread spectrum scrambling, layer mapping, precoding, resource element mapping and the like, wherein the power adjustment of the PDCCH is carried out in a constellation modulation module.
In summary, the invention provides an adaptive method for a downlink control channel, which achieves PDCCH adaptive transmission by using DTX statistics on the performance of a PDCCH and by using a reasonable windowing statistics technique, and improves the reliability of a system to a certain extent.
In addition, as shown in fig. 3, an embodiment of the present invention further relates to a device for improving transmission performance of a physical downlink control channel, including:
a CCE aggregation level processing unit 201, configured to determine a minimum aggregation level of a control channel element CCE corresponding to the user terminal, and determine a CCE aggregation level to be finally used according to the minimum aggregation level of the CCE;
the CCE aggregation level processing unit 201 determines a CCE minimum aggregation level corresponding to the user equipment, specifically as follows:
judging whether the user terminal and the base station carry out data transmission for the first time, if not, the minimum polymerization degree of the CCE of the user terminal is the CCE minimum polymerization degree when the user terminal carries out data transmission for the last time;
if yes, further judging whether the user terminal is a center user and the channel quality indicator CQI is more than or equal to 14, if yes, the minimum polymerization degree of the CCE of the user terminal is 1;
if not, further judging whether the CQI of the user terminal is less than or equal to 5, if so, the minimum polymerization degree of the CCE of the user terminal is 4; and if not, the minimum polymerization degree of the CCE of the user terminal is 2.
The CCE aggregation level processing unit 201 determines a CCE aggregation level to be finally used, specifically as follows:
when the CCE polymerization degree is the minimum polymerization degree of the CCE, matching CCE frequency domain resources for the user terminal, if the user terminal cannot find the matched CCE frequency domain resources, increasing the CCE polymerization degree, and continuing to match the CCE frequency domain resources for the user terminal;
and the CCE polymerization degree corresponding to the matched CCE frequency domain resource obtained by the user terminal is the CCE polymerization degree finally used.
A transmission power processing unit 202, configured to determine, according to the CCE aggregation level that is finally used, transmission power of a physical downlink control channel PDCCH;
the transmission power processing unit 202 determines the transmission power of the PDCCH, specifically as follows:
judging whether the user terminal is an edge user, if so, the transmitting power of the PDCCH is equal to the power of the pilot signal;
if not, further judging whether the channel quality indicator CQI of the user terminal is larger than or equal to a threshold value and the polymerization degree of the CCE finally used is larger than or equal to 4, if so, reducing the transmission power of the PDCCH of the user terminal by 2db on the original basis;
if not, further judging whether the CQI is more than or equal to a threshold value and the CCE polymerization degree finally used is equal to 2, if so, reducing the transmission power of the PDCCH of the user terminal by 1db on the original basis; if not, the transmission power rate of the PDCCH of the user terminal is kept unchanged.
An adjusting unit 203, configured to adjust a CCE aggregation level, a CCE location, or a transmission power of a PDCCH that is finally used by the user equipment according to the number of times that the user equipment is scheduled and the number of times that discontinuous reception (DTX) occurs.
The adjusting unit 203 adjusts the CCE aggregation level, CCE location, or transmission power of the PDCCH finally used by the user equipment, specifically as follows:
judging whether the CCE polymerization degree finally used is less than 8 and whether matched frequency domain resources exist after the CCE polymerization degree finally used is increased, if so, increasing the CCE polymerization degree finally used;
if not, further judging whether available CCE frequency domain resources still exist in the CCE selectable set, if so, selecting the available CCE different from the original CCE position in the CCE selectable set;
if not, further judging whether the base station has the remaining transmitting power for distribution, and if so, increasing the transmitting power of the PDCCH; if not, stopping scheduling the user terminal.
In addition, the apparatus further comprises:
the block error rate processing unit 204 is configured to obtain a ratio of the number of times that DTX occurs to the number of times that the user terminal is scheduled, and when the ratio is greater than 0.01, the adjusting unit adjusts a CCE aggregation level, a CCE location, or transmission power of the PDCCH that is finally used by the user terminal.
A statistical window processing unit 205, configured to count the number of times of DTX occurrence through a statistical window, where the statistical window may be one or more, and each statistical window is preset with a maximum value; when the number of times of DTX occurrence counted by any one statistical window reaches the corresponding preset maximum value, the adjusting unit adjusts the CCE polymerization degree, the CCE position or the transmission power of the PDCCH finally used by the user terminal.
It can be seen from the above embodiments that, the invention selects reasonable initial PDCCH transmitting power and initial CCE aggregation level, performs BLER statistics on PDCCH by using DTX, reflects PDCCH performance, can improve scheduling user performance to a certain extent, and reduces interference to neighboring cell edge users; the method is simple and flexible to realize, and the performance can be improved at the cost of lower computation amount and complexity.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (10)
1. A method for improving transmission performance of a Physical Downlink Control Channel (PDCCH), the method comprising:
determining the minimum polymerization degree of a Control Channel Element (CCE) corresponding to a user terminal, and determining the CCE polymerization degree to be finally used according to the minimum polymerization degree of the CCE;
determining the transmitting power of a Physical Downlink Control Channel (PDCCH) according to the CCE polymerization degree finally used;
and adjusting the CCE polymerization degree, the CCE position or the transmission power of the PDCCH finally used by the user terminal according to the scheduled times of the user terminal and the times of discontinuous reception (DTX).
2. The method for improving the transmission performance of the physical downlink control channel according to claim 1, wherein determining the minimum aggregation level of the CCEs corresponding to the user equipment specifically includes:
judging whether the user terminal and the base station carry out data transmission for the first time, if not, the minimum polymerization degree of the CCE of the user terminal is the CCE minimum polymerization degree when the user terminal carries out data transmission for the last time;
if so, further judging whether the user terminal is a central user and the channel quality indicator CQI is greater than or equal to 14, if so, further judging whether the selected downlink control information DCI is Format1, Format2 or Format2A, if so, the minimum polymerization degree of the CCE of the user terminal is 2, and if not, the minimum polymerization degree of the CCE of the user terminal is 1;
if the user terminal is judged to be an edge user or the CQI is less than 14, further judging whether the CQI of the user terminal is less than or equal to 5, if so, the minimum polymerization degree of the CCE of the user terminal is 4; and if not, the minimum polymerization degree of the CCE of the user terminal is 2.
3. The method for improving the transmission performance of the physical downlink control channel according to claim 1, wherein determining the CCE aggregation level to be finally used specifically includes:
when the CCE polymerization degree is the minimum polymerization degree of the CCE, matching CCE frequency domain resources for the user terminal, if the user terminal cannot find the matched CCE frequency domain resources, increasing the CCE polymerization degree, and continuing to match the CCE frequency domain resources for the user terminal;
and the CCE polymerization degree corresponding to the matched CCE frequency domain resource obtained by the user terminal is the CCE polymerization degree finally used.
4. The method of claim 1, wherein the determining the transmission power of the PDCCH specifically includes:
judging whether the user terminal is an edge user, if so, the transmitting power of the PDCCH is equal to the power of a pilot signal;
if not, further judging whether the Channel Quality Indicator (CQI) of the user terminal is larger than or equal to a threshold value, and if so, keeping the transmitting power of the PDCCH unchanged;
if the CQI of the user terminal is judged to be smaller than the threshold value, further judging whether the CCE polymerization degree finally used is larger than or equal to 4, if so, reducing the transmission power of the PDCCH by 2db on the original basis; if not, further judging whether the CCE polymerization degree finally used is equal to 2, if so, reducing the transmission power rate of the PDCCH by 1db on the original basis; and if not, keeping the transmission power of the PDCCH unchanged.
5. The method of claim 1, wherein the adjusting the CCE aggregation level, the CCE location, or the transmission power of the PDCCH ultimately used by the ue specifically comprises:
judging whether the CCE polymerization degree finally used is less than 8 and whether matched frequency domain resources exist after the CCE polymerization degree finally used is increased, if so, increasing the CCE polymerization degree finally used;
if not, further judging whether available CCE frequency domain resources still exist in the CCE selectable set, and if so, selecting available CCEs with different positions from the original CCE positions in the CCE selectable set;
if the CCE frequency domain resources which are not available in the CCE selectable set are judged, whether the base station has the residual transmitting power for allocation is further judged, and if so, the transmitting power of the PDCCH is increased; and if not, stopping scheduling the user terminal.
6. The method of claim 1, wherein when the ratio of the number of times that DTX occurs to the number of times that the user terminal is scheduled is greater than 0.01, the CCE aggregation level, the CCE location, or the transmission power of the PDCCH ultimately used by the user terminal is adjusted.
7. The method of claim 1, wherein the number of times of DTX occurrence is counted by one or more statistical windows, and each statistical window has a predetermined maximum value; and when the DTX occurrence frequency counted by any one of the statistical windows reaches the corresponding preset maximum value, adjusting the CCE polymerization degree, the CCE position or the transmission power of the PDCCH finally used by the user terminal.
8. An apparatus for improving transmission performance of a physical downlink control channel, the apparatus comprising:
the CCE polymerization degree processing unit is used for determining the minimum polymerization degree of a Control Channel Element (CCE) corresponding to the user terminal and determining the CCE polymerization degree to be finally used according to the minimum polymerization degree of the CCE;
a transmission power processing unit, configured to determine, according to the CCE aggregation level finally used, transmission power of a physical downlink control channel PDCCH;
and the adjusting unit is used for adjusting the CCE polymerization degree, the CCE position or the transmitting power of the PDCCH finally used by the user terminal according to the scheduled times and the times of discontinuous reception (DTX) occurrence of the user terminal.
9. The apparatus for improving transmission performance of a physical downlink control channel according to claim 8, wherein the apparatus further comprises:
and the block error rate processing unit is used for acquiring the ratio of the times of DTX occurrence to the times of scheduling of the user terminal, and when the ratio is greater than 0.01, the adjusting unit adjusts the CCE polymerization degree, the CCE position or the transmission power of the PDCCH finally used by the user terminal.
10. The apparatus for improving transmission performance of a physical downlink control channel according to claim 8, wherein the apparatus further comprises:
a statistic window processing unit, configured to count the number of times of DTX occurrence through a statistic window, where the number of the statistic window may be one or more, and each statistic window is preset with a maximum value; when the number of times of DTX occurrence counted by any one of the statistical windows reaches the corresponding preset maximum value, the adjusting unit adjusts the CCE polymerization degree, the CCE position or the transmission power of the PDCCH finally used by the user terminal.
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| PCT/CN2010/079123 WO2012024869A1 (en) | 2010-08-24 | 2010-11-25 | Method and device for improving physical downlink control channel transmission performance |
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