CN106856612B - Multi-point cooperative communication method and base station - Google Patents
Multi-point cooperative communication method and base station Download PDFInfo
- Publication number
- CN106856612B CN106856612B CN201510906302.XA CN201510906302A CN106856612B CN 106856612 B CN106856612 B CN 106856612B CN 201510906302 A CN201510906302 A CN 201510906302A CN 106856612 B CN106856612 B CN 106856612B
- Authority
- CN
- China
- Prior art keywords
- cqi
- value
- cell
- base station
- rsrp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
Abstract
The invention provides a multipoint cooperative communication method and a base station, relates to the technical field of communication, and is used for realizing multipoint cooperative communication. The method comprises the following steps: a base station receives a measurement report reported by User Equipment (UE); the measurement report carries a first RSRP value of a local cell measured by the UE, a second RSRP value of an adjacent cell measured by the UE and a channel quality value CQI obtained by the UE; determining that the UE is the edge UE of the cell according to the difference value of the first RSRP value and the second RSRP value; obtaining a CQI increment of the UE according to the CQI calculation, and obtaining an updated MCS of the UE according to the CQI and the CQI increment calculation; the base station sends a notification message to an adjacent cell to indicate that the UE is scheduled by using preset resources; the notification message carries information of preset resources used by the base station for scheduling the UE; and transmitting downlink data to the UE by using the preset resource according to the updated MCS so as to schedule the UE.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a multipoint cooperative communication method and a base station.
Background
The LTE (Long Term Evolution) adopts the strategy of co-frequency networking, which leads to the problem of inter-cell interference in the LTE system. In the same RB (Resource Block, time frequency Resource Block) or rbg (RB group), two stations may simultaneously schedule users in their respective cells on the Resource Block. In this way, the same time-frequency resources at the cell edge may interfere with each other, thereby reducing the throughput of the system. In order to solve the problem of interference at the cell edge, the 3GPP proposes a scheme of coordinated Multiple Point Transmission (CoMP).
CoMP includes one technique that is: the UE at the edge of the cell reports the channel condition and the interference condition of the UE to the cell, and the cell informs the resource scheduling information of the UE at the edge to the adjacent cell so as to hope that the adjacent cell avoids using the resource for scheduling the UE during scheduling.
Generally, when a base station schedules a UE, it first needs to calculate a metric value of the UE, and then determines an MCS (Modulation and Coding Scheme) according to the metric value, so as to transmit downlink data based on the corresponding MCS, thereby implementing the scheduling of the UE.
In fact, after the neighboring cell avoids scheduling the resource of a certain UE, the channel quality of the cell changes, and the MCS for correspondingly scheduling the UE also changes. However, the existing CoMP scheme only allows the neighboring cell to avoid scheduling the resource of a certain UE, does not adjust the MCS scheduled by the UE, and still uses the previous MCS to schedule the UE, which causes severe misjudgment on the MCS, thereby affecting the throughput of the cell system.
Disclosure of Invention
The embodiment of the invention provides a multi-point cooperative communication method and a base station, which not only inform an adjacent cell to avoid scheduling UE resources, but also adjust the MCS scheduled by the UE according to the current channel quality, and improve the throughput of the cell system.
In order to achieve the purpose, the embodiment of the invention adopts the technical scheme that:
in a first aspect, a coordinated multi-point communication method is disclosed, including:
a base station receives a measurement report reported by User Equipment (UE); the measurement report carries a first Reference Signal Received Power (RSRP) value of a local cell measured by the UE, a second RSRP value of an adjacent cell measured by the UE and a channel quality value (CQI) obtained by the UE; the local cell is a coverage cell of the base station, and the adjacent cell is adjacent to the local cell;
the base station determines that the UE is the edge UE of the cell according to the difference value of the first RSRP value and the second RSRP value;
the base station obtains the CQI increment of the UE according to the CQI calculation, and obtains the updated MCS of the UE according to the CQI and the CQI increment calculation;
the base station sends a notification message to the adjacent cell to indicate that the UE is scheduled by using preset resources; the notification message carries information of the preset resource used by the base station for scheduling the UE;
and the base station transmits downlink data to the UE by using the preset resource according to the updated MCS so as to schedule the UE.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the determining, by the base station, that the UE is an edge UE of the local cell according to a difference between the first RSRP value and the second RSRP value specifically includes:
calculating to obtain a difference value between the first RSRP value and the second RSRP value;
and if the difference is smaller than a preset threshold value, determining that the UE is the edge UE of the cell.
With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the obtaining, by the base station, a CQI increment of the UE according to the CQI calculation includes:
searching a preset mapping table to obtain a first SINR corresponding to the CQI; the preset mapping table records the corresponding relation between CQI and SINR;
according to X ═ S/(I + N)0) Calculating to obtain a noise value N0(ii) a Wherein S is the first RSRP value, I is the second RSRP value, and X is the first SINR;
according to X ═ S/N0Calculating to obtain the SINR after the interference of the adjacent cell is removed; the X' is the SINR after the interference of the adjacent cell is removed;
searching the preset mapping table to obtain the CQI corresponding to the X'; and taking the CQI corresponding to the X' as the CQI increment.
With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the obtaining an updated MCS of the UE according to the CQI and the CQI increment calculation specifically includes:
according to
Calculating to obtain a metric value M of the UE; the Y is the CQI, the
The CQI increment is obtained, and the Z is the throughput of the UE within a preset time length;
and determining the MCS corresponding to the metric value M of the UE as the updated MCS.
With reference to the second possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, if at least two interfering cells exist in the current cell, the I is an average value of RSRPs measured by the at least two interfering cells.
In a second aspect, a base station is disclosed, comprising:
a receiving unit, configured to receive a measurement report reported by user equipment UE; the measurement report carries a first Reference Signal Received Power (RSRP) value of a local cell measured by the UE, a second RSRP value of an adjacent cell measured by the UE and a channel quality value (CQI) obtained by the UE; the local cell is a coverage cell of the base station, and the adjacent cell is adjacent to the local cell;
a calculating unit, configured to determine, according to a difference between the first RSRP value and the second RSRP value, that the UE is an edge UE of the local cell;
a determining unit, configured to obtain a CQI increment of the UE according to the CQI calculation, and obtain an updated MCS of the UE according to the CQI and the CQI increment calculation;
a sending unit, configured to send a notification message to the neighboring cell, indicating that the UE is to be scheduled using a preset resource; the notification message carries information of the preset resource used by the base station for scheduling the UE;
the sending unit is further configured to transmit downlink data to the UE by using the preset resource according to the updated MCS, so as to schedule the UE.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the calculating unit is specifically configured to calculate and obtain a difference between the first RSRP value and the second RSRP value; and if the difference is smaller than a preset threshold value, determining that the UE is the edge UE of the cell.
With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the determining unit is specifically configured to search a preset mapping table to obtain a first SINR corresponding to the CQI; the preset mapping table records the corresponding relation between CQI and SINR;
according to X ═ S/(I + N)0) Calculating to obtain a noise value N0(ii) a Wherein S is the first RSRP value, I is the second RSRP value, and X is the first SINR;
according to X ═ S/N0Calculating to obtain the SINR after the interference of the adjacent cell is removed; the X' is the SINR after the interference of the adjacent cell is removed;
searching the preset mapping table to obtain the CQI corresponding to the X'; and taking the CQI corresponding to the X' as the CQI increment.
With reference to the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the determining unit is specifically configured to determine, according to the following
Calculating to obtain a metric value M of the UE; the Y is the CQI, the
The CQI increment is obtained, and the Z is the throughput of the UE within a preset time length;
and determining the MCS corresponding to the metric value M of the UE as the updated MCS.
With reference to the second possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, if at least two interfering cells exist in the current cell, the I is an average value of RSRPs measured by the at least two interfering cells.
According to the multipoint cooperative communication method and the base station provided by the embodiment of the invention, the base station determines the UE as the edge UE of the cell. And obtaining the CQI increment of the UE according to the CQI calculation, and obtaining the updated MCS of the UE according to the CQI and the CQI increment calculation. The base station sends a notification message to the adjacent cell to indicate that the UE is scheduled by using preset resources; the notification message carries information of the preset resource used by the base station for scheduling the UE; and transmitting downlink data to the UE by using the preset resource according to the updated MCS so as to schedule the UE. In the prior art, only the neighboring cell is enabled to avoid scheduling the resource of a certain UE, the MCS scheduled by the UE is not adjusted, and the previous MCS is still used to schedule the UE, which causes serious misjudgment on the MCS, thereby affecting the throughput of the cell system. The method and the base station of the invention determine the corresponding MCS after the interference of the adjacent cell is removed, adjust the MCS scheduled by the UE and improve the throughput of the cell system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of UE distribution at cell edge;
fig. 2 is a flowchart illustrating a coordinated multipoint communication method according to embodiment 1 of the present invention;
fig. 3 is a block diagram of a base station according to embodiment 2 of the present invention;
fig. 4 is a block diagram of a base station according to embodiment 3 of the present invention.
Detailed Description
The LTE system employs a frame structure based on Orthogonal Frequency Division Multiplexing (OFDM) technology. OFDM is a high-speed transmission technology in a wireless environment, and the frequency response of a wireless channel is mostly non-flat. The main idea of OFDM technology is to divide a given channel into a number of orthogonal sub-channels in the frequency domain, with one sub-carrier being used for modulation on each sub-channel. The LTE system employs Resource Block (RB) level scheduling in a cell, and optimizes system performance in the cell by scheduling each terminal (User Equipment) in the range of the cell based on channel state information reported by each User.
LTE simultaneously adopts the strategy of same-frequency networking, which causes the problem of interference among cells of the LTE system. Within the same time-frequency resource block RB or rbg (RB group), two stations may simultaneously schedule users in their respective cells on the resource block. The UE at the cell edge may be interfered by the neighboring cell. As shown in fig. 1, UE1 is a user of cell a and is interfered by cell B because it is located at the edge where cell a is adjacent to cell B.
CoMP proposed by 3GPP includes: the edge UE reports the channel condition and the interference condition of the edge UE to the cell, and the cell informs the adjacent cell of the resource information for scheduling the edge UE so as to hope that the adjacent cell avoids using the resource for scheduling the edge UE during scheduling.
Most of the conventional CoMP schemes measure the interference strength of an interfering Cell and the Signal quality RSRP of the Cell based on a CRS (Cell specific Reference Signal)
(Reference Signal Receiving Power), but only notify the interfering cell to avoid using the resource of the cell scheduling edge UE, and not determine the MCS after removing the interference, but still use the previous MCS to schedule the UE, causing serious misjudgment on the MCS used in the next scheduling. In fact, after the interference of the neighboring cell is removed, the channel quality of the cell becomes good, and the MCS used for transmitting the downlink data should be adjusted accordingly, so as to ensure the throughput of the system of the cell.
The principle of the invention is that based on the CoMP scheme supported by the existing terminal, the calibration of MCS is completed only by deleting the strong interference of the cell after the network side silences the neighboring cell on the premise of not changing any terminal characteristics. The method can obviously improve the rate of cell edge users and ensure the throughput of the cell system. In addition, the CoMP scheme can be completed by using the configurable parameters of the current version of the network side without upgrading the network side equipment.
Example 1:
an embodiment of the present invention provides a multipoint cooperative communication method, as shown in fig. 2, the method includes the following steps:
101. the base station sets a preset threshold value.
Specifically, the preset threshold is used to define whether the UE is an edge UE. And after the UE measures the RSRP of the cell and the adjacent cell, reporting a first RSRP value of the cell and a second RSRP value of the adjacent cell to the base station. And the base station calculates and obtains the difference value of the first RSRP value and the second RSRP value.
Generally, the RSRP value of the local cell measured by the UE in the cell is much smaller than the RSRP value of the neighboring cell, when the UE is at the cell edge, the measured RSRP value of the local cell is smaller, and the difference between the measured RSRP value of the neighboring cell and the RSRP value of the neighboring cell is smaller, so that when the difference between the measured RSRP value of the local cell and the RSRP value of the neighboring cell is smaller than the preset threshold, it can be determined that the UE is the edge UE of the local cell.
It should be noted that the local cell is a coverage cell of the base station, and the neighboring cell is a cell adjacent to the local cell.
102. The UE performs RSRP measurement and acquires CQI.
Specifically, the UE measures a first RSRP value of the local cell and a second RSRP value of the neighboring cell by using the CRS. According to SINR ═ S/(I + N)0) And calculating to obtain the SINR corresponding to the UE. Wherein N is0Is a noise value, the S is the first RSRP value, and the I is the second RSRP value.
And searching a preset mapping table to obtain the CQI corresponding to the SINR. The preset mapping table records the corresponding relation between the CQI and the SINR.
103. The UE reports a measurement report to the base station
Wherein the measurement report carries a first Reference Signal Received Power (RSRP) value of the local cell measured by the UE, a second RSRP value of an adjacent cell measured by the UE, and a channel quality value (CQI) obtained by the UE.
104. And the base station receives the measurement report reported by the UE.
105. And the base station determines the UE as the edge UE of the cell according to the difference value of the first RSRP value and the second RSRP value.
When the difference value between the first RSRP value and the second RSRP value is smaller than the preset threshold value, it may be determined that the UE is an edge UE of the local cell.
106. And the base station obtains the CQI increment of the UE according to the CQI calculation and obtains the updated MCS of the UE according to the CQI and the CQI increment calculation.
Specifically, the preset mapping table is searched for, and the CQI pair is obtainedThe corresponding first SINR. According to X ═ S/(I + N)0) Calculating to obtain a noise value N0(ii) a Wherein S is the first RSRP value, I is the second RSRP value, and X is the first SINR; according to X ═ S/N0Calculating to obtain the SINR after the interference of the adjacent cell is removed; the X' is the SINR after the interference of the adjacent cell is removed; searching the preset mapping table to obtain the CQI corresponding to the X'; and taking the CQI corresponding to the X' as the CQI increment.
According to
Calculating a metric value M of the UE; and determining the MCS corresponding to the metric value M of the UE as the updated MCS. Wherein Y is the CQI, theAnd Z is the throughput of the UE within a preset time length for the CQI increment. It should be noted that the preset time period is a period of time before the current time.
107. And the base station sends a notification message to the adjacent cell to indicate that the UE is scheduled by using preset resources.
Wherein the notification message carries information of the preset resource used by the base station for scheduling the UE.
108. And the base station transmits downlink data to the UE by using the preset resource according to the updated MCS so as to schedule the UE.
Generally, the configuration of the radio frequency rate is implemented by an MCS (Modulation and Coding Scheme) index value. The MCS modulation coding table is a representation that is proposed to characterize the communication rate of the WLAN. With the MCS as an index, a set of parameters may be matched in the MCS modulation coding table to characterize the physical transmission rate.
That is, after the interference in the neighboring cell is removed, the channel quality of the cell becomes better, and the corresponding physical transmission rate should be adaptively increased, so the MCS needs to be adjusted. And calculating the channel quality gain CQI increment, and determining a new MCS according to the channel quality gain CQI increment, so that the rate of the UE (cell edge user) can be improved, and the throughput of the cell system can be ensured.
In the multipoint cooperative communication method provided by the embodiment of the present invention, the base station determines that the UE is an edge UE of the local cell. And obtaining the CQI increment of the UE according to the CQI calculation, and obtaining the updated MCS of the UE according to the CQI and the CQI increment calculation. The base station sends a notification message to the adjacent cell to indicate that the UE is scheduled by using preset resources; the notification message carries information of the preset resource used by the base station for scheduling the UE; and transmitting downlink data to the UE by using the preset resource according to the updated MCS so as to schedule the UE. In the prior art, only the neighboring cell avoids scheduling a resource of a certain UE, and does not adjust the MCS scheduled by the UE, the previous MCS is still used to schedule the UE, which causes a serious misjudgment on the MCS, thereby affecting the throughput of the cell system. The method of the invention determines the corresponding MCS after the interference of the adjacent cell is removed, adjusts the MCS scheduled by the UE and improves the throughput of the cell system.
Example 2:
an embodiment of the present invention provides a base station, as shown in fig. 3, including: a receiving unit 201, a calculating unit 202, a determining unit 203, and a transmitting unit 204.
A receiving unit 201, configured to receive a measurement report reported by a user equipment UE; the measurement report carries a first Reference Signal Received Power (RSRP) value of a local cell measured by the UE, a second RSRP value of an adjacent cell measured by the UE and a channel quality value (CQI) obtained by the UE; the local cell is a coverage cell of the base station, and the adjacent cell is adjacent to the local cell.
A calculating unit 202, configured to determine, according to a difference between the first RSRP value and the second RSRP value, that the UE is an edge UE of the local cell.
A determining unit 203, configured to obtain a CQI increment of the UE according to the CQI calculation, and obtain an updated MCS of the UE according to the CQI and the CQI increment calculation;
a sending unit 204, configured to send a notification message to the neighboring cell, indicating that the UE is to be scheduled using a preset resource; the notification message carries information of the preset resource used by the base station for scheduling the UE.
The sending unit 204 is further configured to transmit downlink data to the UE by using the preset resource according to the updated MCS, so as to schedule the UE.
The calculating unit 202 is specifically configured to calculate and obtain a difference between the first RSRP value and the second RSRP value; and if the difference is smaller than a preset threshold value, determining that the UE is the edge UE of the cell.
The determining unit 203 is specifically configured to search a preset mapping table to obtain a first SINR corresponding to the CQI; the preset mapping table records the corresponding relation between CQI and SINR;
according to X ═ S/(I + N)0) Calculating to obtain a noise value N0(ii) a Wherein S is the first RSRP value, I is the second RSRP value, and X is the first SINR;
according to X ═ S/N0Calculating to obtain the SINR after the interference of the adjacent cell is removed; the X' is the SINR after the interference of the adjacent cell is removed;
searching the preset mapping table to obtain the CQI corresponding to the X'; and taking the CQI corresponding to the X' as the CQI increment.
The determination unit 203 is specifically configured to be based on
Calculating to obtain a metric value M of the UE; the Y is the CQI, the
The CQI increment is obtained, and the Z is the throughput of the UE within a preset time length;
and determining the MCS corresponding to the metric value M of the UE as the updated MCS.
It should be noted that, if there are at least two interfering cells in the current cell, the I is an average value of RSRPs measured by the at least two interfering cells.
In addition, the receiving unit in this embodiment may be a receiver of the base station, the sending unit may be a transmitter of the base station, and the receiver and the transmitter may also be integrated together to form a transceiver. The determining unit and the calculating unit may be processors separately set up, or may be implemented by being integrated into a certain processor of the access device, or may be stored in a memory of the client terminal in the form of program codes, and the certain processor of the client terminal calls and executes the functions of the above encrypting unit. The processor may be a Central Processing Unit (CPU) or an Application Specific Integrated Circuit (ASIC).
The base station provided by the embodiment of the invention determines that the UE is the edge UE of the cell. And obtaining the CQI increment of the UE according to the CQI calculation, and obtaining the updated MCS of the UE according to the CQI and the CQI increment calculation. The base station sends a notification message to the adjacent cell to indicate that the UE is scheduled by using preset resources; the notification message carries information of the preset resource used by the base station for scheduling the UE; and transmitting downlink data to the UE by using the preset resource according to the updated MCS so as to schedule the UE. In the prior art, only the neighboring cell is enabled to avoid scheduling the resource of a certain UE, the MCS scheduled by the UE is not adjusted, and the previous MCS is still used to schedule the UE, which causes serious misjudgment on the MCS, thereby affecting the throughput of the cell system. The base station of the invention determines the corresponding MCS after the interference of the adjacent cell is removed, adjusts the MCS scheduled by the UE and improves the throughput of the cell system.
Example 3:
an embodiment of the present invention provides a base station, and as shown in fig. 4, the apparatus includes: a processor 501, a system bus 502, a memory 503, and a receiver 504.
The processor 501 may be a Central Processing Unit (CPU).
A memory 503 for storing a program code and transmitting the program code to the processor 501, and the processor 501 executes the following instructions according to the program code. The memory 503 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory 503 may also include a non-volatile memory (english: non-volatile memory), such as a read-only memory (ROM), a flash memory (flash memory), a hard disk (HDD), or a solid-state drive (SSD). The memory 503 may also comprise a combination of the above kinds of memories. The processor 501 and the memory 503 are connected by a system bus 502 to complete communication therebetween.
The receiver 504 may be implemented by an optical receiver, an electrical receiver, a wireless receiver, or any combination thereof. For example, the optical receiver may be a small form-factor pluggable (SFP) receiver, an enhanced small form-factor pluggable (SFP) receiver, or a 10Gigabit small form-factor pluggable (XFP) receiver. The electrical receiver may be an Ethernet (Ethernet) Network Interface Controller (NIC). The wireless receiver may be a Wireless Network Interface Controller (WNIC).
A receiver 504, configured to receive, by a first base station, a first reference signal received power, RSRP, monitoring message sent by a second base station, where the first RSRP monitoring message carries a change value of an RSRP average value of the second base station and a first RSRP change identifier; the first RSRP change mark indicates that the RSRP average value of the second base station is increased, and the second base station is a base station adjacent to the first base station in the reverse direction of the train running direction.
And the processor 501 is configured to determine that the RSRP monitoring message satisfies an awakening condition according to the first RSRP monitoring message. And awakening the cell covered by the first base station.
The processor 501 is specifically configured to determine that the RSRP average value of the user equipment accessing the second base station is increased according to the first RSRP variation identifier carried in the first RSRP monitoring message, and the variation value of the RSRP average value exceeds a preset threshold, that the RSRP average value satisfies an awake condition.
A processor 501 is configured to determine whether the first base station satisfies a sleep condition. And if the judging unit judges that the first base station meets the dormancy condition, the cell covered by the first base station is dormant.
The receiver 504 is configured to receive a second RSRP monitoring message sent by a third base station, where the second RSRP monitoring message carries an RSRP average value variation value and a second RSRP variation identifier of the third base station; the second RSRP variation mark indicates that the RSRP average value of the third base station is increased, and the third base station is a base station adjacent to the first base station in the train running direction.
Then, the processor 501 is specifically configured to determine that the receiver itself meets the sleep condition according to the second RSRP monitoring message received by the receiving unit.
The processor 501 is specifically configured to determine that the RSRP average value of the third base station is increased according to the second RSRP variation identifier carried in the second RSRP monitoring message, and determine that the sleep condition is satisfied if the variation value of the RSRP average value of the third base station exceeds a preset threshold.
The processor 501 is specifically configured to monitor that the RSRP value of the first base station decreases, and if the decrease value exceeds a preset threshold, determine that the first base station satisfies a sleep condition.
The processor 501 is specifically configured to determine that the receiving unit satisfies the sleep condition if the receiving unit does not receive the wake-up command within a preset time period; the starting time of the preset time length is the time when no user accesses the cell of the first base station.
According to the base station provided by the embodiment of the invention, whether a cell covered by the first base station is awakened or not is determined according to the first RSRP monitoring message sent by the second base station adjacent to the base station in the reverse direction of the driving direction. Judging whether the mobile phone meets the dormancy condition; and if determining that the base station meets the dormancy condition, dormancy of the cell covered by the base station. In the prior art, all sub-cells of a cell shared by RRUs along a railway can radiate signals outwards by a base station no matter whether a train passes through or not, so that resource energy is greatly wasted, and the energy efficiency of a network system is reduced. The method and the base station of the invention awaken the base station cell or the dormant base station cell based on the variation condition of the RSRP value of the base station caused by the running of the train, thereby avoiding the base station along the railway from being always in an activated state, saving the resource energy and improving the energy efficiency of the network system.
Claims (8)
1. A coordinated multipoint communication method, comprising:
a base station receives a measurement report reported by User Equipment (UE); the measurement report carries a first Reference Signal Received Power (RSRP) value of a local cell measured by the UE, a second RSRP value of an adjacent cell measured by the UE and a channel quality value (CQI) obtained by the UE; the local cell is a coverage cell of the base station, and the adjacent cell is adjacent to the local cell;
the base station determines that the UE is an edge UE of the cell according to a difference value between a first RSRP value and the second RSRP value, wherein the first RSRP value is the first reference signal received power RSRP value;
the base station obtains a CQI increment of the UE according to the CQI calculation, and obtains an updated modulation and coding strategy MCS of the UE according to the CQI and the CQI increment calculation, which specifically includes: searching a preset mapping table to obtain a first SINR corresponding to the CQI; the preset mapping table records the corresponding relation between CQI and SINR; according to X ═ S/(I + N)0) Calculating to obtain a noise value N0(ii) a Wherein S is the first RSRP value, I is the second RSRP value, and X is the first SINR; according to X ═ S/N0Calculating to obtain the SINR after the interference of the adjacent cell is removed; the X' is the SINR after the interference of the adjacent cell is removed; searching the preset mapping table to obtain the CQI corresponding to the X'; taking the CQI corresponding to the X' as the CQI increment;
the base station sends a notification message to the adjacent cell to indicate that the UE is scheduled by using preset resources; the notification message carries information of the preset resource used by the base station for scheduling the UE;
and the base station transmits downlink data to the UE by using the preset resource according to the updated MCS so as to schedule the UE.
2. The method of claim 1, wherein the determining, by the base station according to the difference between the first RSRP value and the second RSRP value, that the UE is an edge UE of the current cell specifically comprises:
calculating to obtain a difference value between the first RSRP value and the second RSRP value;
and if the difference is smaller than a preset threshold value, determining that the UE is the edge UE of the cell.
3. The method of claim 1, wherein the obtaining the updated MCS for the UE according to the CQI and the CQI delta calculation specifically comprises:
calculating to obtain a metric value M of the UE according to the M-Y + ▽ Y/Z, wherein Y is the CQI, ▽ Y is the CQI increment, and Z is the throughput of the UE within a preset time length;
and determining the MCS corresponding to the metric value M of the UE as the updated MCS.
4. The method of claim 1, wherein if there are at least two interfering cells in the current cell, the I is an average value of RSRPs measured by the at least two interfering cells.
5. A base station, comprising:
a receiving unit, configured to receive a measurement report reported by user equipment UE; the measurement report carries a first Reference Signal Received Power (RSRP) value of a local cell measured by the UE, a second RSRP value of an adjacent cell measured by the UE and a channel quality value (CQI) obtained by the UE; the local cell is a coverage cell of the base station, and the adjacent cell is adjacent to the local cell;
a calculating unit, configured to determine, according to a difference between a first RSRP value and the second RSRP value, that the UE is an edge UE of the local cell, where the first RSRP value is the first reference signal received power RSRP value;
a determining unit, configured to obtain a CQI increment of the UE according to the CQI calculation, and obtain an updated modulation and coding scheme MCS of the UE according to the CQI and the CQI increment calculation, and specifically configured to: searching a preset mapping table to obtain a first SINR corresponding to the CQI; the preset mapping table records the corresponding relation between CQI and SINR; according to X ═ S/(I + N)0) Calculating to obtain a noise value N0(ii) a Wherein S is the first RSRP value, I is the second RSRP value, and X is the first SINR; according to X ═ S/N0Calculating to obtain the SINR after the interference of the adjacent cell is removed; the X' is the SINR after the interference of the adjacent cell is removed; searching the preset mapping table to obtain the CQI corresponding to the X'; taking the CQI corresponding to the X' as the CQI increment;
a sending unit, configured to send a notification message to the neighboring cell, indicating that the UE is to be scheduled using a preset resource; the notification message carries information of the preset resource used by the base station for scheduling the UE;
the sending unit is further configured to transmit downlink data to the UE by using the preset resource according to the updated MCS, so as to schedule the UE.
6. The base station according to claim 5, wherein the calculating unit is specifically configured to calculate a difference between the first RSRP value and the second RSRP value; and if the difference is smaller than a preset threshold value, determining that the UE is the edge UE of the cell.
7. The base station of claim 5, wherein the determining unit is specifically configured to calculate a metric value M of the UE according to M ═ Y + ▽ Y)/Z, where Y is the CQI, ▽ Y is the CQI increment, and Z is the throughput of the UE within a preset duration;
and determining the MCS corresponding to the metric value M of the UE as the updated MCS.
8. The base station of claim 5, wherein if there are at least two interfering cells in the current cell, the I is an average value of RSRPs measured by the at least two interfering cells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510906302.XA CN106856612B (en) | 2015-12-09 | 2015-12-09 | Multi-point cooperative communication method and base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510906302.XA CN106856612B (en) | 2015-12-09 | 2015-12-09 | Multi-point cooperative communication method and base station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106856612A CN106856612A (en) | 2017-06-16 |
| CN106856612B true CN106856612B (en) | 2020-03-03 |
Family
ID=59132009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510906302.XA Active CN106856612B (en) | 2015-12-09 | 2015-12-09 | Multi-point cooperative communication method and base station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106856612B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108112030B (en) * | 2017-08-11 | 2022-06-07 | 中兴通讯股份有限公司 | Information reporting triggering method and device, and signal selection method and device |
| WO2019061527A1 (en) * | 2017-09-30 | 2019-04-04 | 华为技术有限公司 | Interference processing method, network device and communication device |
| CN113411880B (en) * | 2021-06-17 | 2022-07-01 | 中信科移动通信技术股份有限公司 | Wireless network uplink synchronization method and system |
| CN117082540A (en) * | 2023-06-01 | 2023-11-17 | 中国航空油料集团有限公司 | Multi-cell joint communication method and device of base station and base station |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102036295A (en) * | 2010-12-02 | 2011-04-27 | 大唐移动通信设备有限公司 | Method, system and equipment for determining uplink and downlink configuration |
| CN102291740A (en) * | 2011-08-16 | 2011-12-21 | 电信科学技术研究院 | Method and device for transmitting channel quality indication (CQI) |
| CN102316524A (en) * | 2010-06-30 | 2012-01-11 | 中兴通讯股份有限公司 | Cell load processing method and base station |
| CN103987080A (en) * | 2014-05-28 | 2014-08-13 | 京信通信系统（中国）有限公司 | Edge user determining method and base station equipment |
| WO2014135091A1 (en) * | 2013-03-06 | 2014-09-12 | 华为技术有限公司 | Method for adjusting channel quality indicator and base station |
| CN104185286A (en) * | 2014-08-14 | 2014-12-03 | 京信通信系统（中国）有限公司 | Method and system for downlink interference coordination of long term evolution (LTE) system and LTE base station |
| CN104936241A (en) * | 2015-06-12 | 2015-09-23 | 京信通信技术(广州)有限公司 | Mobility parameter configuring method and device |
-
2015
- 2015-12-09 CN CN201510906302.XA patent/CN106856612B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102316524A (en) * | 2010-06-30 | 2012-01-11 | 中兴通讯股份有限公司 | Cell load processing method and base station |
| CN102036295A (en) * | 2010-12-02 | 2011-04-27 | 大唐移动通信设备有限公司 | Method, system and equipment for determining uplink and downlink configuration |
| CN102291740A (en) * | 2011-08-16 | 2011-12-21 | 电信科学技术研究院 | Method and device for transmitting channel quality indication (CQI) |
| WO2014135091A1 (en) * | 2013-03-06 | 2014-09-12 | 华为技术有限公司 | Method for adjusting channel quality indicator and base station |
| CN103987080A (en) * | 2014-05-28 | 2014-08-13 | 京信通信系统（中国）有限公司 | Edge user determining method and base station equipment |
| CN104185286A (en) * | 2014-08-14 | 2014-12-03 | 京信通信系统（中国）有限公司 | Method and system for downlink interference coordination of long term evolution (LTE) system and LTE base station |
| CN104936241A (en) * | 2015-06-12 | 2015-09-23 | 京信通信技术(广州)有限公司 | Mobility parameter configuring method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106856612A (en) | 2017-06-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9949258B2 (en) | Method and arrangement for adapting guard time based on timing advance | |
| US8811207B2 (en) | Allocating control data to user equipment | |
| US9408151B2 (en) | Terminal apparatus, base station apparatus, communication system, control method, and integrated circuit | |
| US20120322453A1 (en) | Mobile guided uplink interference management | |
| TWI747161B (en) | Methods for enhancement for paging indication and radio resource management (rrm) measurements | |
| CN106793047B (en) | Uplink power control method and base station | |
| CN106856612B (en) | Multi-point cooperative communication method and base station | |
| CN111034295B (en) | Method and apparatus for radio link failure using reference signal processing system | |
| US10694474B2 (en) | Network node and method for managing transmit power | |
| US10798660B1 (en) | Techniques for device-to-device frequency reuse in cellular networks | |
| EP3673596B1 (en) | Method and apparatus for improving resource efficiency in a wireless communication system | |
| EP3414854A1 (en) | Controlling the channel occupancy measurement quality | |
| JPWO2011135693A1 (en) | Mobile communication system, base station, mobile station, and radio communication method | |
| CN115299135A (en) | Method and device for parameter setting | |
| CN109155921B (en) | Method and apparatus for device-to-device communication | |
| US9198165B2 (en) | Sounding reference signal to determine antenna weight and frequency bands | |
| US10681647B2 (en) | Method and apparatus for adjusting transmission power | |
| CN112968755B (en) | Resource allocation method, network device and computer storage medium | |
| CN111148144B (en) | RRM measurement method and device | |
| CN111405643B (en) | Radio resource management measurement method and device | |
| CN110050434B (en) | Feedback transmission for hybrid services | |
| CN109246810B (en) | Uplink scheduling correction method and system based on LTE system | |
| CN111585733A (en) | Method and device for determining quantity of resource elements for data transmission | |
| CN111726851A (en) | Configuration method and device for discontinuous reception | |
| WO2022238937A1 (en) | POWER HEADROOM REPORTING FOR PUSCH TRANSMISSIONS TOWARDS MULTIPLE TRPs |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |