CN102098147B - CQI adjustment method, user equipment, base station and system - Google Patents

Abstract

The embodiment of the invention discloses a channel quality indication (CQI) adjustment method, user equipment, a base station and a system. The method comprises the following steps of: receiving a signaling message transmitted by the base station through the user equipment (UE); respectively measuring CQI of a relay subframe to obtain a first CQI measured value and measuring CQI of an access subframe to obtain a second CQI measured value; and transmitting the first CQI measured value and the second CQI measured value to the base station, so that the base station performs CQI adjustment on the UE scheduled on the relay subframe according to the first CQI measured value and performs CQI adjustment on the UE scheduled on the access subframe according to the second CQI measured value. Because the CQI can be adjusted according to the CQI of the relay subframe and the access subframe, the throughput of the UE scheduled on the relay subframe can be improved, and the error rate and UE retransmission rate are reduced for the UE scheduled on the access subframe.

Description

CQI adjusting method, user equipment, base station and system

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a method, a user equipment, a base station, and a system for adjusting a Channel Quality Indication (CQI).

Background

Relay (Relay) technology can improve cell edge coverage and cell coverage holes, and in an LET-a (long term Evolution Advanced system), each type Relay site can be regarded as an independent base station, and a cell can be regarded as an independent cell. Referring to fig. 1, which is a schematic structural diagram of an LET-a system, a DeNB covers dUE1, dUE2 and aUE, but aUE is far from the DeNB, so that the communication quality is poor, in order to enhance aUE communication quality on the edge of a DeNB coverage cell, an RN is added into the system, but after the RN is added, a new cell edge of the DeNB is formed by an overlapping portion between the RN coverage cell and the DeNB coverage cell, so that the RN coverage cell will generate interference to dUE1 and dUE2 in the DeNB coverage cell. As in fig. 1, communications between aUE and the DeNB are carried out by the RN, and an interfering link between dUE2 and the RN will be formed during the communications. The subframes of the RN are divided into a relay subframe and an access subframe, wherein the access subframe is used for communication between aUE and the RN, and the relay subframe is used for communication between the RN and the DeNB.

Referring to fig. 1, dUE2 needs to send CQI to DeNB, where dUE2 performs SINR (Signal to Interference plus Noise Ratio) measurement according to the intra-cell common pilot Signal, and obtains CQI according to the SINR measurement result. In a CQI reporting period, an RN may have a relay subframe and an access subframe at the same time, but for a dUE to the fact that a downlink relay subframe does not have the transmission signal power of the RN, and the access subframe has the transmission signal power of the RN to aUE, the interference power received by the dUE2 scheduled in the relay subframe is smaller than the interference power received by the dUE2 scheduled in the access subframe.

However, in the prior art, when performing CQI measurement, it is not considered that the interference on the relay subframe and the access subframe dUE to the ue2 is different, and therefore, the finally transmitted CQI measurement value is an intermediate value between the actual CQI value of the relay subframe and the actual CQI value of the access subframe. When the base station adjusts according to the CQI measurement value, for the dUE2 scheduled in the relay subframe, MCS selection is low, air interface resources are wasted, and it is difficult to achieve maximum user throughput; for the dUE2 scheduled in the access subframe, the MCS selection is high, the error rate is increased, the user retransmission probability is increased, and the time delay is increased.

Disclosure of Invention

The embodiment of the application provides a CQI adjusting method, user equipment, a base station and a system, which aim to solve the problem that the CQI measured value sent by the existing terminal is inaccurate.

In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:

a Channel Quality Indicator (CQI) adjusting method comprises the following steps:

user Equipment (UE) receives a signaling message sent by a base station, wherein the signaling message comprises information of a relay subframe and an access subframe;

respectively measuring the CQI of the relay subframe to obtain a first CQI measurement value, and obtaining a second CQI measurement value by the CQI of the access subframe;

and sending the first CQI measurement value and the second CQI measurement value to a base station, so that the base station performs CQI adjustment on the UE scheduled on a relay subframe according to the first CQI measurement value and performs CQI adjustment on the UE scheduled on an access subframe according to the second CQI measurement value.

A user equipment, comprising:

a receiving unit, configured to receive a signaling message sent by a base station, where the signaling message includes information of a relay subframe and an access subframe;

a measuring unit, configured to measure CQI of the relay subframe to obtain a first CQI measurement value, and measure CQI of the access subframe to obtain a second CQI measurement value;

a sending unit, configured to send the first CQI measurement value and the second CQI measurement value measured by the measuring unit to a base station, so that the base station performs CQI adjustment on the UE scheduled on the relay subframe according to the first CQI measurement value, and performs CQI adjustment on the UE scheduled on the access subframe according to the second CQI measurement value.

A Channel Quality Indicator (CQI) adjusting method comprises the following steps:

receiving a first CQI measured value obtained by measuring CQI of a relay subframe and a second CQI measured value obtained by measuring CQI of an access subframe, which are sent by User Equipment (UE);

and performing CQI adjustment on the UE scheduled on a relay subframe according to the first CQI measurement value, and performing CQI adjustment on the UE scheduled on an access subframe according to the second CQI measurement value.

A base station, comprising:

the receiving unit is used for receiving a CQI (channel quality indicator) value of a measurement relay subframe sent by User Equipment (UE) to obtain a first CQI measurement value and measuring the CQI of an access subframe to obtain a second CQI measurement value;

and the adjusting unit is used for carrying out CQI adjustment on the UE scheduled on the relay subframe according to the first CQI measurement value received by the receiving unit and carrying out CQI adjustment on the UE scheduled on the access subframe according to the second CQI measurement value received by the receiving unit.

A CQI adjustment system, comprising: the user equipment and the base station are provided.

A CQI adjustment method, comprising:

a base station receives a CQI measured value sent by User Equipment (UE);

judging whether the UE is currently scheduled in a relay subframe or an access subframe;

and when the UE is scheduled in an access subframe, the CQI measurement value is reduced according to the preset BLER target value to obtain an adjusted second CQI value.

A base station, comprising:

a receiving unit, configured to receive a CQI measurement value sent by a user equipment UE;

a judging unit, configured to judge that the UE is currently scheduled in a relay subframe or an access subframe;

and the adjusting unit is used for increasing the CQI measured value according to a preset target value of the error rate BLER to obtain an adjusted first CQI value when the judging unit judges that the UE is scheduled in a relay subframe, and reducing the CQI measured value according to the preset target value of the BLER to obtain an adjusted second CQI value when the judging unit judges that the UE is scheduled in an access subframe.

A CQI adjustment system, comprising: the base station.

It can be seen from the foregoing embodiments that, in the embodiments of the present application, the UE side and the base station side obtain CQIs for the relay subframe and the access subframe respectively, rather than obtaining only one intermediate value of CQI measurement. Therefore, the embodiment of the application can respectively adjust the CQI according to the CQI of the relay subframe and the CQI of the access subframe, so that the throughput of the UE scheduled in the relay subframe can be improved; for the UE scheduled in the access subframe, the error rate and the UE retransmission probability are reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic diagram of the structure of the LET-A system;

FIG. 2A is a flowchart of a first embodiment of a CQI adjustment method according to the present application;

FIG. 2B is a diagram illustrating a format of MBSFN subframe configuration information in the RRC signaling in FIG. 2A;

FIG. 3 is a flow chart of a second embodiment of a CQI adjustment method according to the present application;

FIG. 4 is a flowchart illustrating a third exemplary embodiment of a CQI adjustment method according to the present application;

FIG. 5A is a flowchart illustrating a fourth exemplary embodiment of a CQI adjustment method according to the present application;

FIG. 5B is a diagram illustrating that the UE with higher interference is preferentially scheduled in the relay subframe in FIG. 5A;

FIG. 6 is a block diagram of an embodiment of a user equipment of the present application;

FIG. 7 is a block diagram of a base station according to a first embodiment of the present application;

fig. 8 is a block diagram of a base station according to a second embodiment of the present application.

Detailed Description

The following embodiments of the present invention provide a CQI adjustment method, user equipment, a base station, and a system.

In order to make the technical solutions in the embodiments of the present invention better understood and make the above objects, features and advantages of the embodiments of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

Referring to fig. 2A, a flowchart of a first embodiment of the CQI adjustment method of the present application is shown, where the first embodiment shows a process of sending two CQI measurement values for an access subframe and a relay subframe respectively at a UE side:

step 201: and the UE receives a signaling message sent by the base station, wherein the signaling message comprises the information of the relay subframe and the access subframe.

The signaling message may specifically be a Radio Resource Control (RRC) signaling message, where the RRC signaling message includes subframe configuration information of a multicast Single Frequency Network (MBSFN) frame, and the MBSFN frame is used as a relay subframe, and other subframes except the MBSFN frame are used as access subframes. Fig. 2B is a schematic diagram of the format of the MBSFN subframe configuration information in the RRC signaling message, wherein the MBSFN-subframe configlist field is used to identify the configuration information of the MBSFN subframe.

Step 202: and respectively measuring the CQI of the relay sub-frame to obtain a first CQI measurement value, and obtaining a second CQI measurement value by the CQI of the access sub-frame.

After receiving the signaling message, the UE distinguishes a relay subframe and an access subframe from the signaling message. When the signaling message is specifically an RRC signaling message, the periodic distribution of MBSFN subframes can be obtained according to the indication of the RRC signaling message, so as to distinguish relay subframes from access subframes.

After distinguishing the relay subframe and the access subframe, respectively carrying out signal-to-noise ratio measurement on the relay subframe and the access subframe to obtain corresponding CQI measurement values, namely measuring a first SINR of the relay subframe for the relay subframe, and obtaining the first CQI measurement values according to the first SINR; and for the access subframe, measuring a second SINR of the access subframe, and obtaining a second CQI measured value according to the second SINR.

Step 203: and sending the first CQI measured value and the second CQI measured value to a base station so that the base station performs CQI adjustment on the UE scheduled in the relay subframe according to the first CQI measured value and performs CQI adjustment on the UE scheduled in the access subframe according to the second CQI measured value.

Since the UE sends the first CQI measurement value for the relay subframe and the second CQI measurement value for the access subframe, respectively, the base station may determine a first CQI adjustment amount for the UE scheduled in the relay subframe according to the first CQI measurement value and determine a first target MCS level according to the first CQI adjustment amount, and determine a second CQI adjustment amount for the UE scheduled in the access subframe according to the second CQI measurement value and determine a second target MCS level according to the second CQI adjustment amount.

Therefore, the embodiments can perform CQI adjustment according to the CQIs of the relay subframe and the access subframe, respectively, so that the throughput of the UE scheduled in the relay subframe can be improved; for the UE scheduled in the access subframe, the error rate and the UE retransmission probability are reduced.

The embodiment shown in fig. 2A describes CQI adjustment from the user equipment side, and correspondingly, if described from the perspective of the base station side, the base station receives the CQI of the measurement relay subframe sent by the user equipment UE to obtain a first CQI measurement value, and measures the CQI of the access subframe to obtain a second CQI measurement value, and then performs CQI adjustment on the UE scheduled in the relay subframe according to the first CQI measurement value, and performs CQI adjustment on the UE scheduled in the access subframe according to the second CQI measurement value. The above specific implementation process is the same as that described in fig. 2A, and is not described herein again.

Referring to fig. 3, a flowchart of a second embodiment of the CQI adjustment method according to the present application is shown, where the process of adjusting CQI measurement values for an access subframe and a relay subframe at a base station side is shown in this embodiment:

step 301: the base station receives the CQI measured value sent by the UE.

In this embodiment, the UE may feed back the CQI measurement value according to a CQI measurement reporting period configured by the RLC signaling or may feed back the CQI measurement value through a PDCCH urgently according to a manner in the prior art. Generally, the UE performs SINR measurement on the common pilot signal, obtains a corresponding CQI measurement value according to the SINR measurement result, and determines whether the current CQI measurement is in a CQI measurement reporting period, and then sends the CQI measurement value.

According to the CQI measurement value sent by the UE, the base station may set an appropriate MCS (Modulation and coding scheme, Modulation and coding scheme level) for each UE according to the CQI measurement value in order to ensure the error rate of the air interface connection of each UE.

Step 302: judging whether the UE is currently scheduled in a relay subframe or an access subframe, and if the UE is scheduled in the relay subframe, executing the step 303; if the scheduling is in the access subframe, step 304 is performed.

Each base station receives a subframe configuration message sent by an upper layer, the subframe configuration message indicates the configuration period of a relay subframe and an access subframe, the base station stores the subframe configuration message, and after receiving a CQI measured value, the base station searches the stored subframe configuration message to know whether the current period is in the relay subframe or the access subframe.

Step 303: and increasing the CQI measured value according to the preset BLER target value, obtaining the adjusted first CQI value, and ending the current process.

Further, the BLER of data transmitted between the UE scheduling the relay subframe and the base station is measured to obtain a first BLER measurement value. It is to be understood that the transmitted data may be data scheduled to be transmitted to the base station by the UE in the relay subframe, or data scheduled to be received by the UE in the relay subframe. Calculating a first CQI adjustment value on the relay subframe according to the first BLER measurement value and a first BLER target value on the relay subframe, increasing the CQI measurement value according to the first CQI adjustment value, and repeatedly executing the step of measuring the BLER of data transmitted between the UE and the base station after the CQI measurement value is increased until the increased CQI measurement value can converge to the first BLER target value, so as to obtain the adjusted first CQI value.

Wherein, the base station pre-stores the target BLER set according to the quality levels of different services. Therefore, when CQI adjustment is required, the base station may obtain the first BLER target value corresponding to the current traffic type by determining the traffic type currently transmitted between the base station and the UE.

In addition, it should be noted that, if the UE scheduled in the relay subframe in the current CQI measurement reporting period does not transmit data, the BLER of the data transmitted in the previous CQI measurement reporting period may be measured as the first BLER measurement value, or the BLER of the data is measured to obtain the first BLER measurement value after waiting for the transmission data between the UE and the base station in the next CQI measurement reporting period.

Step 304: and reducing the CQI measured value according to the preset BLER target value, obtaining an adjusted second CQI value, and ending the current process.

Further, the BLER of data transmitted by the UE scheduled in the access subframe is measured to obtain a second BLER measured value, a second CQI adjustment value of the access subframe is calculated according to the second BLER measured value and a second BLER target value of the access subframe, the CQI measured value is reduced according to the second CQI adjustment value, after the CQI measured value is reduced, the step of measuring the BLER of the data transmitted between the UE and the base station is repeatedly executed until the BLER can be converged to the second BLER target value according to the reduced CQI measured value, and the adjusted second CQI value is obtained.

Wherein, the base station pre-stores the target BLER set according to the quality levels of different services. Therefore, when CQI adjustment is required, the base station may obtain the second BLER target value corresponding to the current traffic type by determining the traffic type currently transmitted between the base station and the UE.

In addition, it should be noted that, if the UE scheduled in the relay subframe in the current CQI measurement reporting period does not transmit data, the BLER of the data transmitted in the previous CQI measurement reporting period may be measured as the second BLER measurement value, or the BLER of the data is measured to obtain the second BLER measurement value after waiting for the transmission data between the UE and the base station in the next CQI measurement reporting period.

Referring to fig. 4, a flowchart of a third embodiment of the CQI adjustment method of the present application is shown, which further details a process of adjusting CQI measurement values for an access subframe and a relay subframe at a base station side:

step 401: the base station receives the CQI measured value sent by the UE.

In this embodiment, the UE may feed back the CQI measurement value according to a CQI measurement reporting period configured by the RLC signaling or may feed back the CQI measurement value through a PDCCH urgently according to a manner in the prior art. Generally, the UE performs SINR measurement on the common pilot signal, obtains a corresponding CQI measurement value according to the SINR measurement result, and determines whether the current CQI measurement is in a CQI measurement reporting period, and then sends the CQI measurement value.

According to the CQI measurement value sent by the UE, the base station may set an appropriate MCS for each UE according to the CQI measurement value in order to ensure the error rate of the air interface connection of each UE.

Step 402: judging whether the UE is currently scheduled in a relay subframe or an access subframe, and if the UE is scheduled in the relay subframe, executing a step 403; if the scheduling is in an access subframe, step 406 is performed.

Each base station receives a subframe configuration message sent by an upper layer, the subframe configuration message indicates the configuration period of a relay subframe and an access subframe, the base station stores the subframe configuration message, and after receiving a CQI measured value, the base station searches the stored subframe configuration message to know whether the current period is in the relay subframe or the access subframe.

As can be seen from fig. 1 and the description in the prior art, since the interference experienced by the UE (dUE 2 in fig. 1) in the relay subframe and the access subframe is different, that is, the relay subframe has no transmission signal power of RN, and the access subframe has transmission signal power of RN pair aUE, the interference power experienced by the UE scheduled in the relay subframe is smaller than the interference power experienced by the UE scheduled in the access subframe. The SINR is calculated according to the following formula:

$\mathrm{SINR}=\frac{P_{\mathrm{crs}}}{\underset{i}{\mathrm{\Σ}}{P}_i}$

in the above formula, P_crsIs the power of the pilot signal and is,

is the cumulative sum of the interference powers. For the relay subframe, i includes a DeNB, and for the access subframe, i includes a DeNB and an RN, so it can be known that SINR measured according to a pilot signal is higher than actual SINR on the access subframe and lower than actual SINR on the relay subframe, and therefore, in the prior art, a CQI measurement value obtained by measuring SINR according to the pilot signal is inaccurate compared with actual CQI, that is, the CQI measurement value is lower than actual CQI on the relay subframe and higher than actual CQI on the access subframe. Based on this, in this embodiment, the base station needs to determine whether the UE is currently scheduled in the relay subframe or the access subframe, so as to perform CQI adjustment according to the determination result, so as to meet different CQI adjustment requirements on the relay subframe and the access subframe.

Step 403: the BLER of data transmitted between the UE and the base station which are scheduled to be in the relay subframe is measured, and a first BLER measured value is obtained.

The UE is currently scheduled in the relay subframe, and as can be seen from the foregoing analysis, the CQI measurement value sent by the UE is lower than the actual CQI value in the relay subframe, and therefore the CQI measurement value needs to be adjusted up.

In order to adjust the CQI measurement value, firstly, the error rate of UE transmission data on a relay subframe is counted according to the following formula: ${\mathrm{IblerMeas}}_{\mathrm{BH}}=\frac{{\mathrm{NumOfNack}}_{\mathrm{BH}}}{{\mathrm{NumOfNack}}_{\mathrm{BH}}+{\mathrm{NumOfAck}}_{\mathrm{BH}}}$

in the above formula, BH represents a relay subframe, IblerMeas_BHRecording the IbleMeas for the error rate of the UE transmission data packet on the relay subframe_BHFor the first BLER measurement, NumOfNack_BHNumOfAck is the number of erroneous packets transmitted on a relay subframe_BHThe number of correct data packets transmitted on the relay subframe. Wherein, the NumOfNack can be determined by counting the quality of initial transmission and retransmission on the relay subframe access link_BHAnd NumOfAck_BH。

Step 404: and calculating a first CQI adjusting value on the relay subframe according to the first BLER measured value and a first BLER target value on the relay subframe.

In this embodiment, the first CQI adjustment value may be calculated according to the following formula:

${\mathrm{\ΔCQI}}_{\mathrm{BH}}={\mathrm{CqiAdjStep}}_{\mathrm{BH}}=\frac{\mathrm{IblerT}\arg \mathrm{et}-{\mathrm{IblerMeas}}_{\mathrm{BH}}}{{\mathrm{IblerT}\arg \mathrm{et}}_{\mathrm{BH}}}$

in the above equation, Δ CQI_BHI.e. the first CQI adjustment value, ibletarget is the first BLER target value, iblbermeas_BHFor the first BLER measurement, CqiAdjStep, obtained in the previous step 403_BHDifferent CQI adjustment step values are usually set correspondingly according to different error rate ranges for CQI adjustment step values on the relay subframe. Thus, when the first BLER measurement IblerMeas is calculated_BHThen, according to IblerMeas_BHSearching the corresponding CQI adjustment step value to obtain CqiAdjStep in the formula_BH。

Step 405: and increasing the CQI measured value according to the first CQI adjusting value until the increased CQI measured value can converge to the first BLER target value, obtaining the first CQI adjusting value, and ending the current process.

After obtaining the first CQI adjustment value delta CQI_BHThen, adding the first CQI adjusting value with a CQI measuring value to obtain an adjusted CQI intermediate value, and adjusting the MCS level according to the CQI intermediate value; then, steps 403 and 404 may be repeatedly performed until the calculated error rate iblbermeas on the relay subframe_BHConverging to a first BLER target value ibletarget, i.e. a first CQI adjustment value Δ CQI calculated at this time_BHApproaching zero, the adjusted first CQI value is obtained.

Step 406: and measuring BLER of data transmitted between the UE accessing the subframe and the base station in scheduling to obtain a second BLER measured value.

The UE is currently scheduled in the access subframe, and it can be known from the foregoing analysis that the CQI measurement value sent by the UE is higher than the actual CQI value in the access subframe, and therefore the CQI measurement value needs to be adjusted downward.

In order to adjust the CQI measurement value, the error rate of UE transmission data on an access subframe is first counted according to the following formula: ${\mathrm{IblerMeas}}_{\mathrm{AL}}=\frac{{\mathrm{NumOfNack}}_{\mathrm{AL}}}{{\mathrm{NumOfNack}}_{\mathrm{AL}}+{\mathrm{NumOfAck}}_{\mathrm{AL}}}$

in the above formula, AL represents an access subframe, IblerMeas_ALRecording the IbleMeas for the error rate of the UE transmission data packet on the access subframe_ALFor the first BLER measurement, NumOfNack_ALFor the number of erroneous packets transmitted on an access subframe, NumOfAck_ALIs the number of correct data packets transmitted on the access subframe. Wherein, the NumOfNack can be determined by counting the quality of initial transmission and retransmission on the access link of the access subframe_ALAnd NumOfAck_AL。

Step 407: and calculating a second CQI adjusting value on the access subframe according to the second BLER measured value and a second BLER target value on the access subframe.

In this embodiment, the second CQI adjustment value may be calculated according to the following formula:

${\mathrm{\ΔCQI}}_{\mathrm{AL}}={\mathrm{CqiAdjStep}}_{\mathrm{AL}}=\frac{\mathrm{IblerT}\arg \mathrm{et}-{\mathrm{IblerMeas}}_{\mathrm{AL}}}{{\mathrm{IblerT}\arg \mathrm{et}}_{\mathrm{AL}}}$

in the above equation, Δ CQI_ALI.e. the second CQI adjustment value, ibletarget is the second BLER target value (in this embodiment, the first BLER target value may be equal to the second BLER target value), iblbermeas_ALFor the second BLER measurement, CqiAdjStep, obtained in step 406 above_ALAdjusting the step value for the CQI on the access subframe, usually setting different CQI adjustment step values according to different error rate ranges, so when a second BLER measurement value IblerMeas is obtained by calculation_ALThen, according to IblerMeas_ALSearching the corresponding CQI adjustment step value to obtain the IblerMeas in the formula_AL。

Step 408: and reducing the CQI measured value according to the second CQI adjusting value until the reduced CQI measured value can be converged to a second BLER target value to obtain a second CQI adjusting value.

After obtaining the second CQI adjustment value delta CQI_ALThen, adding the second CQI adjusting value with the CQI measuring value to obtain an adjusted CQI intermediate value, and adjusting the MCS level according to the CQI intermediate value; then, step 406 and step 407 may be repeatedly performed until the calculated bit error rate iblbermeas on the access subframe_ALConverging to a second BLER target value ibletarget, i.e. a second CQI adjustment value Δ CQI calculated at this time_ALAnd approaching zero, obtaining an adjusted second CQI value.

Referring to fig. 5A, a flowchart of a fourth embodiment of a CQI adjustment method is applied, where the fourth embodiment illustrates a process that a base station preferentially schedules a UE on a relay subframe according to a CQI measurement value and a second CQI value, and the fourth embodiment accepts the third embodiment of the CQI adjustment method, that is, an adjustment procedure performed after obtaining an adjusted second CQI value:

step 501: and acquiring the CQI measurement value sent by the UE and the adjusted second CQI value.

Step 502: judging whether the difference value between the CQI measurement value and the second CQI value is larger than a preset threshold value, if so, executing a step 503; otherwise, step 505 is performed.

And when the difference value between the CQI measurement value and the second CQI value is larger than a preset threshold value, indicating that the UE is greatly interfered.

Step 503: judging whether residual resources exist on the relay subframe, if so, executing step 504; otherwise, step 505 is performed.

And the base station preferentially ensures that resources are allocated to the Relay in the Relay subframe, and then the difference resource obtained by subtracting the resources allocated to the Relay from the total resources of the base station is the residual resource.

Step 504: and preferentially scheduling the UE on the relay subframe, and ending the current process.

Step 505: and scheduling the UE on the access subframe, and ending the current flow.

Referring to fig. 5B, which is a schematic diagram of the structure of the LET-a system shown in fig. 1, a UE with a higher interference is preferentially scheduled in a relay subframe:

as can be seen from fig. 1, dUE to the close distance between dUE2 under DeNB and aUE under RN relative to dUE1 and aUE, dUE to dUE2 is more susceptible to aUE interference than dUE 1. And since there is no RN transmit signal power on the relay subframe and there is RN pair aUE transmit signal power on the access subframe, the interference power experienced by dUE to dUE2 scheduled on the relay subframe is less than the interference power experienced by dUE to dUE2 scheduled on the access subframe.

As in fig. 5B, the unfilled boxes represent access subframes, the shaded boxes represent relay subframes, D represents uplink subframes, U represents downlink subframes, and S represents special subframes. The left side is an existing subframe scheduling diagram, in an access subframe, a DeNB schedules a dUE2, and an RN schedules a dUE aUE, so that aUE has large interference on the dUE 2; the right side is a schematic diagram of subframe scheduling applying the embodiment of the application, when redundant resources exist on a relay subframe, the DeNB schedules only the dUE1 on the access subframe, and the scheduling of the dUE2 is put on the relay subframe, so that interference between the access user aUE under the RN and the direct user dUE2 under the DeNB is reduced, and the throughput of the direct user such as dUE2 is improved.

Corresponding to the embodiment of the CQI adjusting method, the application also provides embodiments of user equipment, a base station and a system.

Referring to fig. 6, a block diagram of a first embodiment of a user equipment according to the present application is shown, where the user equipment may be a user equipment that executes the first embodiment of the CQI adjustment method:

the user equipment includes: a receiving unit 610, a measuring unit 620 and a transmitting unit 630.

The receiving unit 610 is configured to receive a signaling message sent by a base station, where the signaling message includes information of a relay subframe and an access subframe;

a measuring unit 620, configured to measure the CQI of the relay subframe to obtain a first CQI measurement value, and measure the CQI of the access subframe to obtain a second CQI measurement value;

a sending unit 630, configured to send the first CQI measurement value and the second CQI measurement value measured by the measuring unit to a base station, so that the base station performs CQI adjustment on the UE scheduled on the relay subframe according to the first CQI measurement value, and performs CQI adjustment on the UE scheduled on the access subframe according to the second CQI measurement value.

In particular, the measurement unit 620 may include (not shown in fig. 6):

a distinguishing subunit, configured to distinguish a relay subframe and an access subframe according to the signaling message received by the receiving unit;

a first measuring subunit, configured to measure a first SINR of the relay subframe, and obtain the first CQI measurement value according to the first SINR;

and the second measurement subunit is used for measuring a second SINR of the access subframe and obtaining the second CQI measurement value according to the second SINR.

Referring to fig. 7, which is a block diagram of a base station according to a first embodiment of the present application, the base station may be a base station in the first embodiment of the CQI adjustment method:

the base station includes: a receiving unit 710 and an adjusting unit 720.

The receiving unit 710 is configured to receive a CQI, which is sent by a user equipment UE and used for measuring a relay subframe, to obtain a first CQI measurement value, and measure a CQI of an access subframe to obtain a second CQI measurement value;

an adjusting unit 720, configured to perform CQI adjustment on the UE scheduled on the relay subframe according to the first CQI measurement value, and perform CQI adjustment on the UE scheduled on the access subframe according to the second CQI measurement value.

Further, the system for implementing the first embodiment of the CQI adjustment method may specifically include the user equipment and the base station shown in fig. 6 and fig. 7, which are not described herein again.

Referring to fig. 8, which is a block diagram of a second embodiment of the base station of the present application, the base station may be a base station that performs the second embodiment and the third embodiment of the CQI adjustment method described above.

The base station includes: a receiving unit 810, a judging unit 820 and an adjusting unit 830.

The receiving unit 810 is configured to receive a CQI measurement value sent by a user equipment UE;

a determining unit 820, configured to determine that the UE is currently scheduled in a relay subframe or an access subframe;

an adjusting unit 830, configured to, when the determining unit 820 determines that the UE is scheduled in a relay subframe, increase the CQI measurement value according to a preset BLER target value to obtain an adjusted first CQI value, and when the determining unit 820 determines that the UE is scheduled in an access subframe, decrease the CQI measurement value according to the preset BLER target value to obtain an adjusted second CQI value.

Specifically, the adjusting unit 830 may include (not shown in fig. 8):

a first measurement subunit, configured to measure a BLER of data transmitted between the UE and the base station that schedule the relay subframe, to obtain a first BLER measurement value;

a first calculating subunit, configured to calculate a first CQI adjustment value of the relay subframe according to the first BLER measurement value measured by the first measuring subunit and a first BLER target value of the relay subframe;

an increase adjustment subunit, configured to increase the CQI measurement value according to the first CQI adjustment value calculated by the first calculation subunit until the CQI measurement value can converge to the first BLER target value according to the increased CQI measurement value, and obtain an adjusted first CQI value;

a second measurement subunit, configured to measure a BLER of data scheduled to be transmitted between the UE of the access subframe and the base station, to obtain a second BLER measurement value;

a second calculating subunit, configured to calculate a second CQI adjustment value of the access subframe according to a second BLER measurement value measured by the second measuring subunit and a second BLER target value of the access subframe;

and a reduction adjustment subunit, configured to reduce the CQI measurement value according to the second CQI adjustment value calculated by the second calculation subunit until the CQI measurement value can converge to a second BLER target value according to the reduced CQI measurement value, so as to obtain an adjusted second CQI value.

Further, the base station may further include (not shown in fig. 8): and the scheduling unit is used for judging whether the difference value between the CQI measurement value and the second CQI adjustment value is greater than a preset threshold value, and if the difference value is greater than the preset threshold value and the relay subframe has residual resources, the UE is preferentially scheduled on the relay subframe.

Further, the system for implementing the second embodiment and the third embodiment of the CQI adjustment method may specifically include the base station shown in fig. 8, and is not described herein again.

As can be seen from the description of the above embodiments, in the embodiment of the present application, the UE side and the base station side obtain CQIs for the relay subframe and the access subframe respectively, instead of obtaining only one intermediate value of CQI measurement. Therefore, the embodiment of the application can respectively adjust the CQI according to the CQI of the relay subframe and the CQI of the access subframe, so that the throughput of the UE scheduled on the relay subframe can be improved; for the UE scheduled on the access subframe, the error rate and the UE retransmission probability are reduced.

Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (14)

1. A Channel Quality Indicator (CQI) adjusting method is characterized by comprising the following steps:

user Equipment (UE) receives a signaling message sent by a base station, wherein the signaling message comprises information of a relay subframe and an access subframe;

respectively measuring the CQI of the relay subframe to obtain a first CQI measurement value, and obtaining a second CQI measurement value by the CQI of the access subframe;

and sending the first CQI measurement value and the second CQI measurement value to a base station, so that the base station performs CQI adjustment on the UE scheduled on a relay subframe according to the first CQI measurement value and performs CQI adjustment on the UE scheduled on an access subframe according to the second CQI measurement value.

2. The method of claim 1, wherein the separately measuring the CQI for the relay subframe results in a first CQI measurement value and the CQI for the access subframe results in a second CQI measurement value comprises:

distinguishing a relay subframe and an access subframe according to the signaling message;

for a relay subframe, measuring a first SINR of the relay subframe, and obtaining a first CQI measurement value according to the first SINR;

and for an access subframe, measuring a second SINR of the access subframe, and obtaining a second CQI measurement value according to the second SINR.

3. A user device, comprising:

a receiving unit, configured to receive a signaling message sent by a base station, where the signaling message includes information of a relay subframe and an access subframe;

a measuring unit, configured to measure CQI of the relay subframe to obtain a first CQI measurement value, and measure CQI of the access subframe to obtain a second CQI measurement value;

a sending unit, configured to send the first CQI measurement value and the second CQI measurement value measured by the measuring unit to a base station, so that the base station performs CQI adjustment on the UE scheduled on the relay subframe according to the first CQI measurement value, and performs CQI adjustment on the UE scheduled on the access subframe according to the second CQI measurement value.

4. The apparatus of claim 3, wherein the measurement unit comprises:

a distinguishing subunit, configured to distinguish a relay subframe and an access subframe according to the signaling message received by the receiving unit;

a first measuring subunit, configured to measure a first SINR of the relay subframe, and obtain the first CQI measurement value according to the first SINR;

and the second measurement subunit is used for measuring a second SINR of the access subframe and obtaining the second CQI measurement value according to the second SINR.

5. A Channel Quality Indicator (CQI) adjusting method is characterized by comprising the following steps:

receiving a first CQI measurement value obtained by measuring CQI of a relay subframe and a second CQI measurement value obtained by measuring CQI of an access subframe, which are sent by User Equipment (UE);

and performing CQI adjustment on the UE scheduled on a relay subframe according to the first CQI measurement value, and performing CQI adjustment on the UE scheduled on an access subframe according to the second CQI measurement value.

6. A base station, comprising:

the receiving unit is used for receiving a first CQI measured value obtained by measuring CQI of a relay subframe and sent by User Equipment (UE) and a second CQI measured value obtained by measuring CQI of an access subframe;

and the adjusting unit is used for carrying out CQI adjustment on the UE scheduled on the relay subframe according to the first CQI measurement value received by the receiving unit and carrying out CQI adjustment on the UE scheduled on the access subframe according to the second CQI measurement value received by the receiving unit.

7. A CQI adjustment system, comprising: the user equipment of claim 3 or 4, and the base station of claim 6.

8. A CQI adjustment method, comprising:

a base station receives a CQI measured value sent by User Equipment (UE);

judging whether the UE is currently scheduled in a relay subframe or an access subframe;

and when the UE is scheduled in an access subframe, the CQI measurement value is reduced according to the preset BLER target value to obtain an adjusted second CQI value.

9. The method of claim 8, wherein the increasing the measured CQI value according to a preset BLER target value to obtain an adjusted first CQI value comprises:

measuring BLER of data transmitted between UE (user equipment) of a relay subframe and a base station in scheduling to obtain a first BLER measured value;

calculating a first CQI adjustment value on the relay subframe according to the first BLER measurement value and a first BLER target value of the relay subframe;

increasing the CQI measured value according to the first CQI adjusting value until the increased CQI measured value can converge to the first BLER target value to obtain an adjusted first CQI value;

the reducing the CQI measurement value according to the preset BLER target value, and obtaining an adjusted second CQI value includes:

measuring BLER of data transmitted between UE (user equipment) accessing a subframe and a base station in scheduling to obtain a second BLER measured value;

calculating a second CQI adjustment value on the access subframe according to the second BLER measured value and a second BLER target value of the access subframe;

and reducing the CQI measured value according to the second CQI adjusting value until the reduced CQI measured value can be converged to a second BLER target value to obtain an adjusted second CQI value.

10. The method of claim 9, further comprising:

judging whether the difference value between the CQI measurement value and the second CQI value is larger than a preset threshold value or not;

and when the number of the resources is larger than the preset threshold value and the relay subframe has residual resources, the UE is scheduled on the relay subframe preferentially.

11. A base station, comprising:

a receiving unit, configured to receive a CQI measurement value sent by a user equipment UE;

a judging unit, configured to judge that the UE is currently scheduled in a relay subframe or an access subframe;

and the adjusting unit is used for increasing the CQI measured value according to a preset target value of the error rate BLER to obtain an adjusted first CQI value when the judging unit judges that the UE is scheduled in a relay subframe, and reducing the CQI measured value according to the preset target value of the BLER to obtain an adjusted second CQI value when the judging unit judges that the UE is scheduled in an access subframe.

12. The base station of claim 11, wherein the adjusting unit comprises:

a first measurement subunit, configured to measure a BLER of data transmitted between the UE and the base station that schedule the relay subframe, to obtain a first BLER measurement value;

a first calculating subunit, configured to calculate a first CQI adjustment value of the relay subframe according to the first BLER measurement value measured by the first measuring subunit and a first BLER target value of the relay subframe;

an increase adjustment subunit, configured to increase the CQI measurement value according to the first CQI adjustment value calculated by the first calculation subunit until the CQI measurement value can converge to the first BLER target value according to the increased CQI measurement value, and obtain an adjusted first CQI value; or,

a second measurement subunit, configured to measure a BLER of data scheduled to be transmitted between the UE of the access subframe and the base station, to obtain a second BLER measurement value;

a second calculating subunit, configured to calculate a second CQI adjustment value of the access subframe according to a second BLER measurement value measured by the second measuring subunit and a second BLER target value of the access subframe;

and a reduction adjustment subunit, configured to reduce the CQI measurement value according to the second CQI adjustment value calculated by the second calculation subunit until the CQI measurement value can converge to a second BLER target value according to the reduced CQI measurement value, so as to obtain an adjusted second CQI value.

13. The base station of claim 12, further comprising:

and the scheduling unit is used for judging whether the difference value between the CQI measurement value and the second CQI adjustment value is greater than a preset threshold value, and if the difference value is greater than the preset threshold value and the relay subframe has residual resources, the UE is preferentially scheduled on the relay subframe.

14. A CQI adjustment system, comprising: a base station as claimed in any one of claims 11 to 13.

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