CN101860867A - Method, system and equipment for optimizing cell reference symbols - Google Patents

Abstract

The invention discloses a method, a system and equipment for optimizing cell reference symbols. The method comprises the following steps that: a network node receives a measurement event from UE; the network node determines the information of the UE according to the measurement event; and the network node optimizes the cell reference symbols of the UE according to the information of the UE. The coverage condition of the cell reference symbols is acquired by using the measurement event of the UE, and the cell reference symbols are optimized and the transmitting power of the cell reference symbols is adjusted according to the coverage condition so as to fulfill the purpose of automatically optimizing the cell reference symbols; and the cell reference symbols can be accurately optimized without modifying a protocol.

Description

Method, system and equipment for optimizing cell reference symbol

Technical Field

The present invention relates to the field of mobile communications technologies, and in particular, to a method, a system, and a device for optimizing a cell reference symbol.

Background

LTE (Long Term Evolution) is the Evolution of 3G (3rd Generation, third Generation mobile communication system), and improves and enhances the 3G over-the-air access technology, and adopts OFDM (Orthogonal Frequency Division Multiplexing) and MIMO (Multiple Input Multiple Output) as the only standards for wireless network Evolution. LTE can provide peak rates of 100Mbit/s downlink and 50Mbit/s uplink under the frequency spectrum bandwidth of 20MHz, thereby improving the performance of cell edge users, improving the cell capacity and reducing the system delay. In the LTE system, a Reference Symbol (RS) is introduced, and according to the RS, a terminal can perform channel estimation and channel quality estimation, and provide a Reference for selection of a precoding or modulation coding scheme of a traffic channel.

In the process of implementing the invention, the inventor finds that the prior art has at least the following problems: in the existing LTE system, the transmission power of the RS is manually set, and is set according to the cell coverage area planned by the network. When the transmit power of the RS needs to be optimized, manual participation is also needed, and both the construction and operation costs of the network are high.

Disclosure of Invention

The invention provides a method, a system and equipment for optimizing a cell reference symbol, which are used for automatically optimizing the reference symbol of a cell and adjusting the transmitting power.

To achieve the above object, an aspect of the present invention provides a method for optimizing a cell reference symbol, including the following steps:

a network node receives a measurement event from User Equipment (UE);

the network node determines the information of the UE according to the measurement event;

and the network node optimizes the reference symbol of the cell where the UE is located according to the information of the UE.

Preferably, the network node receiving the measurement event from the UE comprises:

the network node receiving an A2 event from the UE, the A2 event being an event that a serving cell measurement quality is below a preset first threshold; or

The network node receives an A3 event from the UE, wherein the A3 event is an event that the measurement quality of a serving cell or the measurement quality of a neighbor cell is greater than a preset second threshold value.

Preferably, after the network node receives an a2 event from the UE, the method further includes:

the network node records the time information corresponding to the received A2 event;

and when the network node receives the measurement report event from the UE, recording the time information corresponding to the received measurement report event.

Preferably, the determining, by the network node, the UE information according to the measurement event includes:

and the network node determines the information of the UE according to the time information corresponding to the A2 event and the time information corresponding to the measurement report event, and determines that the UE is a weak coverage user when the difference value between the time information corresponding to the measurement report event and the time information corresponding to the A2 event exceeds a preset first numerical value.

Preferably, after determining that the UE is a weak coverage user, the method further includes:

the network node counts the proportion of the weak coverage users of the cell in which the UE is positioned, and when the proportion of the weak coverage users of the cell in which the UE is positioned exceeds a preset second numerical value, the cell in which the UE is positioned is determined to be a weak coverage cell; or

The network node reports the information that the cell where the UE is located has the weak coverage user to the network equipment, the network equipment counts the reporting frequency of the cell where the UE is located, and when the reporting frequency of the cell where the UE is located exceeds a preset third numerical value and the frequency that the cell where the UE is located reports the information that the cell where the UE is located has the weak coverage user exceeds a preset fourth numerical value, the cell where the UE is located is determined to be the weak coverage cell.

Preferably, when the network node receives an a3 event from the UE, the network node determining, according to the measurement event, information of the UE includes:

and the network node determines that the UE is an over-coverage user.

Preferably, after determining that the UE is an over-coverage user, the method further includes:

the network node counts the proportion of the over-covered users of the cell where the UE is located, and when the proportion of the over-covered users of the cell where the UE is located exceeds a preset fifth numerical value, the cell where the UE is located is determined to be an over-covered cell; or

The network node reports the information that the cell where the UE is located has the over-coverage user to network equipment, the network equipment counts the reporting frequency of the cell where the UE is located, and when the reporting frequency of the cell where the UE is located exceeds a preset sixth numerical value and the frequency that the neighbor cell of the cell where the UE is located reports the information that the over-coverage user exists exceeds a preset seventh numerical value, the cell where the UE is located is determined to be the over-coverage cell.

Preferably, the network node optimizing the reference symbol of the cell in which the UE is located according to the information of the UE includes:

when the cell where the UE is located is a weak coverage cell, the network node increases the transmitting power for transmitting the cell reference symbol to the cell where the UE is located; or

And when the cell in which the UE is positioned is an over-coverage cell, the network node reduces the transmitting power for sending the cell reference symbol to the cell in which the UE is positioned.

The invention also provides a system for optimizing the cell reference symbol, which comprises:

user equipment for sending a measurement event to a network node;

and the network node is used for determining the information of the user equipment according to the measurement event and optimizing the reference symbol of the cell in which the user equipment is positioned according to the information of the user equipment.

Preferably, the system further comprises:

and the network equipment is used for receiving the information of the user equipment from the network node, acquiring the coverage condition of the cell where the user equipment is located according to the information of the user equipment, and informing the network node to optimize the reference symbol of the cell where the user equipment is located according to the coverage condition.

The present invention also provides an apparatus for optimizing a cell reference symbol, comprising:

a receiving module, configured to receive a measurement event from a UE;

a determining module, electrically connected to the receiving module, for determining information of the UE according to the measurement event;

and the optimization module is electrically connected with the determination module and used for optimizing the reference symbol of the cell where the UE is located according to the information of the UE.

Preferably, the receiving module is specifically configured to receive an a2 event from the UE, where the a2 event is an event that a serving cell measurement quality is lower than a preset first threshold; or

Receiving an A3 event from the UE, wherein the A3 event is an event that the measurement quality of the serving cell or the measurement quality of the neighbor cell is greater than a preset second threshold value.

Preferably, the apparatus further comprises:

the recording module is electrically connected with the receiving module and is used for recording the time information corresponding to the A2 event received by the receiving module; and recording time information corresponding to the received measurement report event when the measurement report event from the UE is received.

Preferably, the determining module is specifically configured to determine the information of the UE according to the time information corresponding to the a2 event and the time information corresponding to the measurement report event, and when a difference between the time information corresponding to the measurement report event and the time information corresponding to the a2 event exceeds a preset first value, determine that the information of the UE is a weak coverage user.

Preferably, the apparatus further comprises:

the counting module is electrically connected with the determining module and used for counting the proportion of the weak coverage users of the cell in which the UE is located when the determining module determines that the UE information is that the UE is the weak coverage user;

the determining module is further configured to determine that the cell in which the UE is located is a weak coverage cell when the ratio of the weak coverage users of the cell in which the UE is located, counted by the counting module, exceeds a preset second value; or

The apparatus further comprises:

the reporting module is electrically connected with the determining module and is used for reporting the information of the weak coverage user existing in the cell where the UE is located to network equipment when the determining module determines that the UE information is that the UE is the weak coverage user, so that the network equipment counts the reporting frequency of the cell where the UE is located;

the receiving module is further configured to receive, from the network device, information that it is determined that the cell where the UE is located is a weak coverage cell when the reporting frequency of the cell where the UE is located, which is counted by the network device, exceeds a preset third value and the frequency of reporting, in the neighboring cell of the cell where the UE is located, that the weak coverage user information exists exceeds a preset fourth value;

the determining module is further configured to determine, according to the information that the cell where the UE is located is the weak coverage cell received by the receiving module, that the cell where the UE is located is the weak coverage cell.

Preferably, the determining module is specifically configured to determine that the UE information is that the UE is an over-coverage user when the receiving module receives an a3 event from the UE.

Preferably, the counting module is configured to count a proportion of over-covered users in a cell where the UE is located when the determining module determines that the UE is the over-covered user;

the determining module is further configured to determine that the cell in which the UE is located is an over-coverage cell when the ratio of the over-coverage users of the cell in which the UE is located, which is counted by the counting module, exceeds a preset fifth value; or

The reporting module is used for reporting the information of the over-coverage user existing in the cell where the UE is located to network equipment when the determining module determines that the UE information is the over-coverage user, so that the network equipment counts the reporting frequency of the cell where the UE is located;

the receiving module is further configured to receive, from the network device, information that it is determined that the cell where the UE is located is an over-coverage cell when the reporting frequency of the cell where the UE is located, which is counted by the network device, exceeds a preset sixth numerical value and the frequency of the over-coverage user information reported by the neighboring cell of the cell where the UE is located exceeds a preset seventh numerical value;

the determining module is further configured to determine, according to the information that the cell where the UE is located is the weak coverage cell received by the receiving module, that the cell where the UE is located is the weak coverage cell.

Preferably, the optimization module is specifically configured to, when the cell in which the UE is located is a weak coverage cell, increase the transmission power for transmitting the cell reference symbol to the cell in which the UE is located; or

And when the cell in which the UE is positioned is the over-coverage cell, reducing the transmitting power for transmitting the cell reference symbol to the cell in which the UE is positioned.

Compared with the prior art, the invention has the following advantages: the coverage condition of the cell reference symbol is obtained by using the measurement event of the UE, the reference symbol of the cell is optimized according to the coverage condition, and the transmitting power of the cell reference symbol is adjusted, so that the purpose of automatically optimizing the cell reference symbol is achieved, and the cell reference symbol can be accurately optimized without modifying a protocol.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a flowchart of a method for optimizing cell reference symbols according to the present invention;

fig. 2 is a flowchart of a method for optimizing cell reference symbols according to a first embodiment of the present invention;

fig. 3 is a schematic diagram of coverage of each cell in an ideal situation in the present invention;

FIGS. 4A and 4B are schematic diagrams of a weak coverage condition in the present invention;

fig. 5 is a flowchart of a method for optimizing cell reference symbols according to a second embodiment of the present invention;

FIGS. 6A and 6B are schematic diagrams of an over-coverage condition in the present invention;

fig. 7 is a flowchart of a method for optimizing cell reference symbols according to a third embodiment of the present invention;

fig. 8 is a flowchart of a method for optimizing cell reference symbols according to a fourth embodiment of the present invention;

fig. 9 is a structural diagram of an apparatus for optimizing cell reference symbols according to the present invention.

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the invention, a network node obtains the coverage condition of a cell reference symbol according to a measurement event, optimizes the cell reference symbol according to the coverage condition and automatically adjusts the transmitting power of the cell reference symbol, namely after receiving a measurement report of a terminal, the network node optimizes the transmitting power of an RS according to the measurement event in the measurement report, and the specific mode comprises but is not limited to (1) adjusting the transmitting power of the RS after a base station receives the measurement report of the terminal; (2) after receiving the measurement report of the terminal, the base station reports the information of the terminal to an OM (operation and Maintenance) device, and the OM device notifies the base station to adjust the transmitting power of the RS according to the reporting condition of the cell where the terminal is located and the reporting condition of the neighboring cell of the terminal.

The invention provides a method for optimizing a cell reference symbol, which comprises the following steps as shown in figure 1:

step S101, the network node receives a measurement event from the user equipment UE.

Wherein the network node receiving the measurement event from the UE comprises:

the network node receiving an A2 event from the UE, the A2 event being an event that a serving cell measurement quality is below a preset first threshold; or

The network node receives an A3 event from the UE, wherein the A3 event is an event that the measurement quality of a serving cell or the measurement quality of a neighbor cell is greater than a preset second threshold value.

Step S102, the network node determines the information of the UE according to the measurement event.

Wherein, after the network node receives the A2 event from the UE, the method further comprises:

the network node records the time information corresponding to the received A2 event;

and when the network node receives the measurement report event from the UE, recording the time information corresponding to the received measurement report event.

Specifically, the measurement report event from the UE is an event other than the a2 event sent by the UE to the network node.

Wherein the network node determining the information of the UE according to the measurement event comprises:

and the network node determines the information of the UE according to the time information corresponding to the A2 event and the time information corresponding to the measurement report event, and determines that the UE is a weak coverage user when the difference value between the time information corresponding to the measurement report event and the time information corresponding to the A2 event exceeds a preset first numerical value.

Wherein, after determining that the UE is a weak coverage user, the method further includes:

the network node counts the proportion of the weak coverage users of the cell in which the UE is positioned, and when the proportion of the weak coverage users of the cell in which the UE is positioned exceeds a preset second numerical value, the cell in which the UE is positioned is determined to be a weak coverage cell; or

The network node reports the information that the cell where the UE is located has the weak coverage user to the network equipment, the network equipment counts the reporting frequency of the cell where the UE is located, and when the reporting frequency of the cell where the UE is located exceeds a preset third numerical value and the frequency that the cell where the UE is located reports the information that the cell where the UE is located has the weak coverage user exceeds a preset fourth numerical value, the cell where the UE is located is determined to be the weak coverage cell.

Wherein when the network node receives an a3 event from the UE, the network node determining information of the UE according to the measurement event comprises:

and the network node determines that the UE is an over-coverage user.

Wherein, after determining that the UE is an over-coverage user, the method further includes:

the network node counts the proportion of the over-covered users of the cell where the UE is located, and when the proportion of the over-covered users of the cell where the UE is located exceeds a preset fifth numerical value, the cell where the UE is located is determined to be an over-covered cell; or

The network node reports the information that the cell where the UE is located has the over-coverage user to network equipment, the network equipment counts the reporting frequency of the cell where the UE is located, and when the reporting frequency of the cell where the UE is located exceeds a preset sixth numerical value and the frequency that the neighbor cell of the cell where the UE is located reports the information that the over-coverage user exists exceeds a preset seventh numerical value, the cell where the UE is located is determined to be the over-coverage cell.

Step S103, the network node optimizes the reference symbol of the cell where the UE is located according to the information of the UE.

Wherein the network node optimizing the reference symbol of the cell in which the UE is located according to the information of the UE comprises:

when the cell where the UE is located is a weak coverage cell, the network node increases the transmitting power for transmitting the cell reference symbol to the cell where the UE is located; or

And when the cell in which the UE is positioned is an over-coverage cell, the network node reduces the transmitting power for sending the cell reference symbol to the cell in which the UE is positioned.

In the present invention, the network node includes but is not limited to a base station, the network device includes but is not limited to an OM device, and the first threshold, the second threshold, the first numerical value, the second numerical value, the third numerical value, the fourth numerical value, the fifth numerical value, the sixth numerical value, and the seventh numerical value are all preset numerical values and can be arbitrarily selected according to actual situations.

A first embodiment of the present invention provides a method for optimizing a cell reference symbol, where the method is used to optimize the cell reference symbol in an LTE system, obtain a coverage condition of the cell reference symbol through a measurement event of a UE, and adjust a transmit power of the cell reference symbol in time according to the coverage condition, so as to automatically optimize a dedicated reference symbol of a cell. In this embodiment, weak coverage self-optimization of a cell reference symbol is taken as an example for explanation, and as shown in fig. 2, the optimization method includes the following steps:

step S201, the base station sends a cell reference symbol to a UE (User Equipment).

The base station may periodically send a cell reference symbol to the UE in the cell controlled by the base station, where the cell reference symbol carries the power information of the local cell and the power information of the neighboring cell. In the present invention, the local CELL is a CELL controlled by the base station, and the neighboring CELLs are CELLs connected to the local CELL, as shown in fig. 3, the local CELL takes CELL 0 as an example, and the neighboring CELLs are CELL 1 to CELL 6 as an example.

Specifically, the base station may control a plurality of UEs in the cell, and the base station may send a reference symbol to each UE, where the reference symbol is a dedicated reference symbol of the cell.

Step S202, the UE receives the cell reference symbol from the base station, when the information carried in the cell reference symbol meets the reporting condition of the A2 event, the UE sends the A2 event to the base station, and when the information carried in the cell reference symbol meets the exit condition of the A2 event, the UE does not send the A2 event to the base station any more.

The a2 event is an event that the dedicated reference symbol of the serving cell (own cell) is lower than a preset threshold, where the preset threshold is a value stored in advance according to experience, and the lower of the dedicated reference symbol of the serving cell than the preset threshold may be that the received power of the serving cell is lower than a preset power value, and the received power value of the serving cell is carried in the cell reference symbol.

The reporting condition of the event satisfying a2 is that the exiting condition of the event satisfying a2 is Ms-Hys > Thresh, in the present invention, Ms (Measurement Services) is a serving cell Measurement result, Hys is a hysteresis value, Thresh is a threshold, wherein Ms may be an RSRP value (dBm) or an RSRQ value (dB), Hys is a numerical value preset according to factors such as historical experience, Thresh is a numerical value preset according to factors such as historical experience, the Hys value and Thresh value may be selected according to actual conditions, RSRP value is an absolute value of serving cell received power, RSRQ value is a relative value between serving cell received power and neighboring cell received power, wherein, after receiving a cell reference symbol from a base station, a UE acquires power information of a local cell (serving cell) and power information of neighboring cells therein, and calculates the RSRP value and/or q value according to the power information of the local cell and the power information of the neighboring cells, and judging whether the information carried in the RSRP value meets the condition of reporting the A2 event, if so, sending the A2 event to the base station, otherwise, not reporting the A2 event, and reporting the A2 event to the base station until the information carried in the received cell reference symbol from the base station meets the reporting condition of the A2 event.

Specifically, in a mobile communication system, due to the mobility of the UE or other reasons, the communication system requires that the UE can perform handover between neighboring cells, and in order to implement the handover between neighboring cells, the UE needs to sense the signal quality of a cell that may be a handover target before the handover, that is, to measure the signal quality of a neighboring cell. For example, in a current WCDMA (Wideband Code Division Multiple Access) system, a UTRAN (Universal Terrestrial Radio Access Network ) on a Network side normalizes a measurement behavior and a measurement standard of a UE by issuing a measurement CONTROL message (measurement CONTROL) to the UE, and the UE REPORTs a result meeting the measurement standard to the UTRAN on the Network side in a measurement REPORT (measurement REPORT) manner, so that the system makes a handover decision; similarly, in the LTE system, the UE needs to report the event meeting the measurement standard to the base station in the form of a measurement report.

Step S203, the base station receives the measurement event from the UE, and when the base station receives the a2 event from the UE, the base station records the time information corresponding to the received a2 event, that is, a timer may be started for the UE, or the base station may directly record the start time of the received a2 event.

When the base station receives a2 event from a plurality of different UEs, it may start a timer for each UE, or may use one timer to time all UEs reporting a2 event, or of course, the base station may also time all UEs reporting a2 event by using 2 or more timers. For example, table 1 shows the case of using one timer to time all UEs reporting an a2 event (total 3 UEs).

TABLE 1

UE reporting A2 event	Time-measuring start time (timer starting time)
		UE1	2009-03-178 hours, 20 minutes and 16 seconds
UE2	2009-03-179 hours 20 minutes 16 seconds
		UE3	2009-03-1710 hours, 20 minutes and 16 seconds

Step S204, during the period when the timer is started, when the base station receives any other measurement report event from the UE, the base station records the time information corresponding to the received other event, for example, the timer started for the UE may be stopped, or the start time of the received other event may be directly recorded in the base station.

Wherein, the any other measurement report event includes, but is not limited to, a measurement report of an a1 event, a measurement report of an A3 event, a measurement report of an a4 event, a measurement report of an a5 event, a measurement report of a B1 event, and a measurement report of a B2 event, and the B1 event and the B2 event are events in different system mixed coverage areas.

Specifically, the condition for triggering the reporting of the measurement report of the event is as follows: when the serving cell is better than the threshold value, triggering a measurement report reporting an A1 event; when the adjacent cell is better than the service cell by an offset value, triggering a measurement report reporting an A3 event; when the adjacent cell is better than the threshold value, triggering and reporting a measurement report of an A4 event; when the serving cell is lower than the threshold 1 and the neighboring cell is better than the threshold 2, triggering a measurement report reporting an A5 event; when an Inter-Radio Access Technology (Inter-Radio Access Technology, Inter-system Radio Access Technology) neighbor cell is superior to a threshold value, triggering and reporting a measurement report of a B1 event; and when the serving cell is lower than the threshold value 1 and the Inter-RAT adjacent cell is better than the threshold value 2, triggering the measurement report of reporting the B2 event.

When receiving the measurement report event corresponding to the UE with the timer started, the base station stops the timer corresponding to the UE. For example, when UE 1 has started a timer, and the base station receives a measurement report of an a1 event from UE 1, the base station stops the timer of UE 1; when all the UEs reporting the a2 event are timed in one timer, and the base station receives the measurement report of the a1 event from the UE 1, the base station stops the timing information corresponding to the UE 1.

Step S205, after the base station acquires that the timer is overtime, the UE is determined to be a weak coverage user.

The base station acquires the starting time and the ending time of the timer, calculates the time for starting the timer, and determines that the UE is a weak coverage user when the time exceeds a preset time value. The preset event is a time pre-stored in the base station according to experience.

Specifically, the base station may determine whether the time is out according to the recorded time information corresponding to the event of receiving the a2 and the recorded time information corresponding to the event of receiving the other events, so as to determine that the UE is a weak coverage user; when the timer is started for the UE and is stopped when other events are received, the base station can also calculate the time used by the timer according to the starting time and the ending time of the timer, so as to determine that the UE is a weak coverage user. For example, for the UE on timer shown in table 1, when the measurement report of the a1 event for UE 1 and UE 2 is received, the end time is recorded into the table as shown in table 2.

TABLE 2

It can be seen that, when the preset time for determining whether the timer expires, which is stored in the base station, is 30 minutes, the timer of UE 2 expires, and the timer of UE 1 does not expire.

It is apparent that the a2 event is an event that the dedicated reference symbol of the serving cell is lower than a preset threshold, that is, the a2 event is an event that the received power is lower than a preset power value, and when a UE transmits the a2 event to the base station for a long time, that is, the time (the timing time of the timer) used by the UE to transmit the a2 event to the base station exceeds a preset time value, the UE is a weak coverage user.

Step S206, the base station counts the information of the UE weak coverage user in the coverage area of the base station, when the cell is weak coverage, the sending power of the cell is improved, when the adjacent cell is weak coverage, the sending power of the cell does not need to be adjusted.

Wherein, when the UE is a weak coverage user, it may be weak coverage of the CELL and also weak coverage of the neighboring CELL, and the conditions of the weak coverage of the CELL or the weak coverage of the neighboring CELL are shown in fig. 4A and 4B, respectively. The base station judges whether the cell is in weak coverage or in weak coverage of an adjacent cell by counting the information of the UE users in the coverage area of the base station. When the ratio of the event a2 sent by the UE in the cell to the base station reaches a preset value, it is determined that the cell is in weak coverage, and when the base station sends the cell reference symbol to the UE, the transmission power needs to be increased, that is, the cell reference symbol is optimized. The preset value is arbitrarily selected according to experience, for example, 60% may be selected, when there are 100 users in the CELL (CELL 0), 80 of the users all send an a2 event to the base station, and the timing time of the a2 event of 70 users is over, it is seen that the CELL is a weak coverage area (the proportion of 70% is greater than 60%); when there are 100 users in the CELL (CELL 0), 40 of them all send a2 events to the base station, and the timing time of a2 event of 30 users is overtime, it is seen that the CELL is not a weak coverage area, and may be users close to the neighboring CELL are affected by the neighboring CELL, thereby causing the reception power of the UE to be too low, and causing the UE to be a weak coverage user.

The method can adjust the sequence of each step according to actual needs.

Therefore, in the embodiment, the coverage condition of the cell reference symbol is obtained by using the measurement event of the UE, the cell reference symbol is optimized according to the coverage condition, and the transmission power of the cell reference symbol is adjusted, so that the purpose of automatically optimizing the cell reference symbol is achieved, and the cell reference symbol can be more accurately optimized without modifying a protocol.

A second embodiment of the present invention provides a method for optimizing a cell reference symbol, where the method is used to optimize the cell reference symbol in an LTE system, obtain a coverage condition of the cell reference symbol through a measurement event of a UE, and adjust a transmit power of the cell reference symbol in time according to the coverage condition, so as to automatically optimize a dedicated reference symbol of a cell. In this embodiment, an over-coverage self-optimization of a cell reference symbol is taken as an example for explanation, and as shown in fig. 5, the optimization method includes the following steps:

step S501, the base station sends a cell reference symbol to the UE.

The base station may periodically send a cell reference symbol to the UE in the cell controlled by the base station, where the cell reference symbol carries the power information of the cell and the power information of the neighboring cell. There are multiple UEs in the cell controlled by the base station, and the base station may send a dedicated reference symbol to each UE.

Step S502, the UE receives the cell reference symbol from the base station, and when the information carried in the cell reference symbol meets the reporting condition of the A3 event, the UE sends the A3 event to the base station.

The event a3 is an event that the dedicated reference symbol of the serving cell (local cell) or the neighboring cell is greater than a threshold value, where the preset threshold is a value stored in advance according to experience, and the value of the dedicated reference symbol of the serving cell greater than the preset threshold may be that the received power of the serving cell is greater than a preset power value, and the received power value of the serving cell is carried in the cell reference symbol. If the reporting condition of the event A3 is that the neighboring cell is better than the serving cell by an offset value, the reporting of the measurement report of the event A3 is triggered.

In step S503, the base station receives the measurement event from the UE, and when the base station receives the a3 event from the UE, the user is an over-coverage user. The event A3 is an event that the dedicated reference symbol of the serving cell (local cell) or the neighboring cell is greater than the threshold value, that is, the event A3 is an event that the received power is greater than the preset power value, and when a UE sends an event A3 to the base station, the UE is an over-coverage user.

Step S504, the base station counts the UE over-coverage user information in the coverage area of the base station, when the cell is over-covered, the sending power of the cell is reduced, when the adjacent cell is over-covered, the sending power of the cell does not need to be adjusted.

Wherein, when the UE is an over-covered user, it may be that the CELL is over-covered or that the neighboring CELL is over-covered, and the over-covered situation of the CELL or the over-covered situation of the neighboring CELL are shown in fig. 6A and 6B, respectively. The base station judges whether the cell is over-covered or the adjacent cell is over-covered by counting the information of the UE over-covered users in the coverage area of the base station. When the ratio of the event a3 sent by the UE in the cell to the base station reaches a preset value, it is determined that the cell is over-covered, and when the base station sends the cell reference symbol to the UE, the transmission power needs to be reduced, that is, the cell reference symbol needs to be optimized. The preset value is arbitrarily selected according to experience, for example, 60% may be selected, and when there are 100 users in the CELL (CELL 0), 75 of the users all send an a3 event to the base station, and thus, the CELL is an over-coverage area (the proportion of 75% is greater than 60%); when there are 100 users in the CELL (CELL 0), 40 of them all send an a3 event to the base station, and it can be seen that the CELL is not an over-coverage area, and may be users close to the neighboring CELL are affected by the neighboring CELL, so that the reception power of the UE is too high, and the UE is an over-coverage user.

The method can adjust the sequence of each step according to actual needs.

Therefore, in the embodiment, the coverage condition of the cell reference symbol is obtained by using the measurement event of the UE, the cell reference symbol is optimized according to the coverage condition, and the transmission power of the cell reference symbol is adjusted, so that the purpose of automatically optimizing the cell reference symbol is achieved, and the cell reference symbol can be more accurately optimized without modifying a protocol.

A third embodiment of the present invention provides a method for optimizing a cell reference symbol, as shown in fig. 7, the method for optimizing includes the following steps:

step S701, the base station sends a cell reference symbol to the UE.

Step S702, the UE receives the cell reference symbol from the base station, when the information carried in the cell reference symbol meets the report condition of the A2 event, the UE sends the A2 event to the base station, and when the information carried in the cell reference symbol meets the exit condition of the A2 event, the UE does not send the A2 event to the base station any more.

Step S703, the base station receives the measurement event from the UE, and when the base station receives the a2 event from the UE, the base station records the time information corresponding to the received a2 event, that is, a timer may be started for the UE, or the base station may directly record the start time of the received a2 event.

Step S704, during the period when the timer is started, when the base station receives any other measurement report event from the UE, the base station records the time information corresponding to the received other event, for example, the timer started for the UE may be stopped, or the start time of the received other event may be directly recorded in the base station.

Step S705, after the base station obtains that the timer is overtime, it determines that the UE is a weak coverage user.

The steps S701 to S705 are the same as the steps S201 to S205, and are not described herein again.

Step S706, the base station reports the information that the weak coverage user exists in the cell to the OM device.

The OM device controls a plurality of base stations, each base station needs to report information of weak coverage users existing in a cell controlled by the base station to the OM device, and the OM device also stores information of physical positions among the plurality of base stations, that is, the OM device can know which cells are adjacent cells.

Step S707, the OM device counts the reporting frequency of the weak coverage of each cell, and when the weak coverage frequency of a certain cell is very high and the reporting frequencies of the weak coverage of all surrounding neighboring cells are also very high, the certain cell is a weak coverage area, and the OM device informs the base station corresponding to the cell to increase the RS transmission power.

For example, if the probability of the weak coverage reported by the cell 0 is higher than the preset threshold TH1, and the frequency reported by the weak coverage of all neighboring cells is also higher than the preset threshold TH2, it is considered that the cell 0 has weak coverage, and OM notifies the base station corresponding to the cell 0 to increase the transmission power of the cell 0.

The method can adjust the sequence of each step according to actual needs.

Therefore, in the embodiment, the coverage condition of the cell reference symbol is obtained by using the measurement event of the UE, the cell reference symbol is optimized according to the coverage condition, and the transmission power of the cell reference symbol is adjusted, so that the purpose of automatically optimizing the cell reference symbol is achieved, and the cell reference symbol can be more accurately optimized without modifying a protocol.

A fourth embodiment of the present invention provides a method for optimizing a cell reference symbol, as shown in fig. 8, the method for optimizing includes the following steps:

step S801, the base station transmits a cell reference symbol to the UE.

Step S802, the UE receives the cell reference symbol from the base station, and when the information carried in the cell reference symbol meets the reporting condition of the A3 event, the UE sends the A3 event to the base station.

In step S803, the base station receives the measurement event from the UE, and when the base station receives an a3 event from the UE, the user is an over-coverage user.

The steps S801 to S803 are the same as the steps S501 to S503, and are not described herein again.

Step S804, the base station reports the information of the users having coverage in the cell to the OM device.

The OM device controls a plurality of base stations, each base station needs to report information of an over-coverage user existing in a cell controlled by the base station to the OM device, and the OM device also stores information of physical positions among the plurality of base stations, that is, the OM device can know which cells are adjacent cells.

Step S805, the OM device counts the reporting frequencies of the over coverage of each cell, and when the over coverage frequency of a certain cell is high and the over coverage reporting frequencies of all neighboring cells are also high, the certain cell is an over coverage area, and the OM device notifies the base station corresponding to the cell to increase the RS transmission power.

For example, if the probability of the coverage reported by the cell 0 is higher than the preset threshold TH1, and the frequencies reported by all neighboring cells in the vicinity of the cell in the coverage are also higher than the preset threshold TH2, it is considered that the cell 0 is covered, and OM notifies the base station corresponding to the cell 0 to reduce the transmission power of the cell 0.

The method can adjust the sequence of each step according to actual needs.

Therefore, in the embodiment, the coverage condition of the cell reference symbol is obtained by using the measurement event of the UE, the cell reference symbol is optimized according to the coverage condition, and the transmission power of the cell reference symbol is adjusted, so that the purpose of automatically optimizing the cell reference symbol is achieved, and the cell reference symbol can be more accurately optimized without modifying a protocol.

The invention also provides a system for optimizing the cell reference symbol, which comprises the user equipment UE, the network node and the network equipment, wherein the network node can be a base station, and the network equipment can be OM equipment. Wherein,

user equipment for sending a measurement event to a network node.

And the network node is used for determining the information of the UE according to the measurement event and optimizing the reference symbol of the cell in which the UE is positioned according to the information of the UE.

Wherein the network node is further configured to receive an a2 event from the UE, the a2 event being an event that the serving cell measurement quality is lower than a preset first threshold value; or

Receiving an A3 event from the UE, wherein the A3 event is the event that the measurement quality of the serving cell or the measurement quality of the neighbor cell is greater than a preset second threshold value.

The network node is further used for recording time information corresponding to the event of receiving the A2; and when receiving a measurement report event from the UE, recording time information corresponding to the received measurement report event.

The network node is further configured to determine information of the UE according to the time information corresponding to the a2 event and the time information corresponding to the measurement report event, and when a difference between the time information corresponding to the measurement report event and the time information corresponding to the a2 event exceeds a preset first value, determine that the UE is a weak coverage user.

The network node is further configured to count a proportion of the weak coverage users of the cell in which the UE is located, and determine that the cell in which the UE is located is a weak coverage cell when the proportion of the weak coverage users of the cell in which the UE is located exceeds a preset second value; or

Reporting information of a cell where the UE is located and having a weak coverage user to network equipment, counting the reporting frequency of the cell where the UE is located by the network equipment, and determining that the cell where the UE is located is a weak coverage cell when the reporting frequency of the cell where the UE is located exceeds a preset third numerical value and the frequency of the cell where the UE is located and having the weak coverage user information reported by a neighboring cell of the cell where the UE is located exceeds a preset fourth numerical value.

Wherein, the network node is further configured to determine that the UE is an over-coverage user when receiving an a3 event from the UE.

The network node is further configured to count a proportion of over-covered users of the cell in which the UE is located, and determine that the cell in which the UE is located is an over-covered cell when the proportion of the weak-covered users of the cell in which the UE is located exceeds a preset fifth value; or

Reporting the information of the over-coverage user existing in the cell where the UE is located to network equipment, counting the reporting frequency of the cell where the UE is located by the network equipment, and determining that the cell where the UE is located is the over-coverage cell when the reporting frequency of the cell where the UE is located exceeds a preset sixth numerical value and the frequency of the over-coverage user existing information reported by the adjacent cell of the cell where the UE is located exceeds a preset seventh numerical value.

The network node is also used for increasing the transmitting power for transmitting the cell reference symbol to the cell where the UE is located when the cell where the UE is located is a weak coverage cell; or

And when the cell in which the UE is positioned is the over-coverage cell, reducing the transmitting power for transmitting the cell reference symbol to the cell in which the UE is positioned.

And the network equipment is used for receiving the information of the UE from the network node, acquiring the coverage condition of the cell where the UE is located according to the information of the UE, and informing the network node to optimize the reference symbol of the cell where the UE is located according to the coverage condition.

The present invention also provides a device for optimizing cell reference symbols, where the device is a node in a network, including but not limited to a base station, as shown in fig. 9, and the device includes:

a receivingmodule 91, configured to receive a measurement event from the UE.

The receivingmodule 91 is specifically configured to receive an a2 event from the UE, where the a2 event is an event that the serving cell measurement quality is lower than a preset first threshold; or

Receiving an A3 event from the UE, wherein the A3 event is the event that the measurement quality of the serving cell or the measurement quality of the neighbor cell is greater than a preset second threshold value.

The receivingmodule 91 is further configured to receive, from the network device, information for determining that the cell where the UE is located is the weak coverage cell when the reporting frequency of the cell where the UE is located, which is counted by the network device, exceeds a preset third value and the frequency of reporting the weak coverage user information in the neighboring cell of the cell where the UE is located exceeds a preset fourth value.

The receivingmodule 91 is further configured to receive, from the network device, information that it is determined that the cell where the UE is located is the over-coverage cell when the reporting frequency of the cell where the UE is located, which is counted by the network device, exceeds a preset sixth value and the frequency of the information of the over-coverage user reported by the neighboring cell of the cell where the UE is located exceeds a preset seventh value.

The determiningmodule 92 is electrically connected to the receivingmodule 91, and configured to determine information of the UE according to the measurement event.

The determiningmodule 92 is specifically configured to determine information of the UE according to the time information corresponding to the a2 event and the time information corresponding to the measurement report event, and when a difference between the time information corresponding to the measurement report event and the time information corresponding to the a2 event exceeds a preset first value, determine that the UE is a weak coverage user.

The determiningmodule 92 is specifically configured to determine that the UE information is that the UE is an over-coverage user when the receivingmodule 91 receives an a3 event from the UE.

The determiningmodule 92 is further configured to determine that the cell in which the UE is located is the weak coverage cell when the ratio of the weak coverage users of the cell in which the UE is located, which is counted by thecounting module 95, exceeds a preset second value.

The determiningmodule 92 is further configured to determine, according to the information that the cell in which the UE is located, received by the receivingmodule 91, is the weak coverage cell, that the cell in which the UE is located is the weak coverage cell.

The determiningmodule 92 is further configured to determine that the cell in which the UE is located is an over-coverage cell when thecounting module 95 counts that the proportion of the over-coverage users in the cell in which the UE is located exceeds a preset fifth numerical value.

The determiningmodule 92 is further configured to determine, according to the information that the cell in which the UE is located is the over-coverage cell received by the receivingmodule 91, that the cell in which the UE is located is the over-coverage cell.

The optimizingmodule 93 is electrically connected to the determiningmodule 92, and configured to optimize the reference symbol of the cell where the UE is located according to the UE information determined by the determiningmodule 92.

Theoptimization module 93 is specifically configured to, when a cell in which the UE is located is a weak coverage cell, increase transmission power for transmitting a cell reference symbol to the cell in which the UE is located; or

And when the cell in which the UE is positioned is the over-coverage cell, reducing the transmitting power for transmitting the cell reference symbol to the cell in which the UE is positioned.

The recording module 94 is electrically connected to the receivingmodule 91 and is configured to record time information corresponding to the event a2 received by the receivingmodule 91; and when receiving a measurement report event from the UE, recording time information corresponding to the received measurement report event.

Thecounting module 95 is electrically connected to the determiningmodule 92, and configured to count a ratio of the weak coverage users in the cell where the UE is located when the determiningmodule 92 determines that the UE is the weak coverage user.

Thecounting module 95 is further configured to count a proportion of over-covered users in a cell where the UE is located when the determiningmodule 92 determines that the information of the UE is that the UE is an over-covered user.

The reportingmodule 96 is electrically connected to the determiningmodule 92, and is configured to report, to the network device, the information that the UE exists in the cell where the UE is located when the determiningmodule 92 determines that the UE is the weak coverage user, so that the network device counts a reporting frequency of the cell where the UE is located.

The reportingmodule 96 is further configured to report, when the determiningmodule 92 determines that the information of the UE is that the UE is an over-coverage user, the information that the over-coverage user exists in the cell where the UE is located to the network device, so that the network device counts a reporting frequency of the cell where the UE is located.

The modules may be distributed in one device or may be distributed in a plurality of devices. The modules can be combined into one module, and can also be further split into a plurality of sub-modules.

Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by hardware, or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments of the present invention.

Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred embodiment and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present invention.

Those skilled in the art will appreciate that the modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, and may be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.

The above-mentioned serial numbers of the present invention are for description only and do not represent the merits of the embodiments.

The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.

Claims (18)

1. A method for optimizing cell reference symbols, comprising the steps of:

a network node receives a measurement event from User Equipment (UE);

the network node determines the information of the UE according to the measurement event;

and the network node optimizes the reference symbol of the cell where the UE is located according to the information of the UE.

2. The method of claim 1, wherein the network node receiving the measurement event from the UE comprises:

the network node receiving an A2 event from the UE, the A2 event being an event that a serving cell measurement quality is below a preset first threshold; or

The network node receives an A3 event from the UE, wherein the A3 event is an event that the measurement quality of a serving cell or the measurement quality of a neighbor cell is greater than a preset second threshold value.

3. The method of claim 2, wherein after the network node receives an a2 event from the UE, further comprising:

the network node records the time information corresponding to the received A2 event;

and when the network node receives the measurement report event from the UE, recording the time information corresponding to the received measurement report event.

4. The method of claim 3, wherein the network node determining information for the UE from the measurement event comprises:

and the network node determines the information of the UE according to the time information corresponding to the A2 event and the time information corresponding to the measurement report event, and determines that the UE is a weak coverage user when the difference value between the time information corresponding to the measurement report event and the time information corresponding to the A2 event exceeds a preset first numerical value.

5. The method of claim 4, wherein after determining that the UE is a weak coverage user, further comprising:

the network node counts the proportion of the weak coverage users of the cell in which the UE is positioned, and when the proportion of the weak coverage users of the cell in which the UE is positioned exceeds a preset second numerical value, the cell in which the UE is positioned is determined to be a weak coverage cell; or

The network node reports the information that the cell where the UE is located has the weak coverage user to the network equipment, the network equipment counts the reporting frequency of the cell where the UE is located, and when the reporting frequency of the cell where the UE is located exceeds a preset third numerical value and the frequency that the cell where the UE is located reports the information that the cell where the UE is located has the weak coverage user exceeds a preset fourth numerical value, the cell where the UE is located is determined to be the weak coverage cell.

6. The method of claim 2, wherein when the network node receives an a3 event from the UE, the network node determining information for the UE from the measurement event comprises:

and the network node determines that the UE is an over-coverage user.

7. The method of claim 6, wherein after determining that the UE is an over-coverage user, further comprising:

the network node counts the proportion of the over-covered users of the cell where the UE is located, and when the proportion of the over-covered users of the cell where the UE is located exceeds a preset fifth numerical value, the cell where the UE is located is determined to be an over-covered cell; or

The network node reports the information that the cell where the UE is located has the over-coverage user to network equipment, the network equipment counts the reporting frequency of the cell where the UE is located, and when the reporting frequency of the cell where the UE is located exceeds a preset sixth numerical value and the frequency that the neighbor cell of the cell where the UE is located reports the information that the over-coverage user exists exceeds a preset seventh numerical value, the cell where the UE is located is determined to be the over-coverage cell.

8. The method of claim 5 or 7, wherein the network node optimizing the reference symbol of the cell in which the UE is located according to the UE information comprises:

when the cell where the UE is located is a weak coverage cell, the network node increases the transmitting power for transmitting the cell reference symbol to the cell where the UE is located; or

And when the cell in which the UE is positioned is an over-coverage cell, the network node reduces the transmitting power for sending the cell reference symbol to the cell in which the UE is positioned.

9. A system for optimizing cell reference symbols, comprising:

user equipment for sending a measurement event to a network node;

and the network node is used for determining the information of the user equipment according to the measurement event and optimizing the reference symbol of the cell in which the user equipment is positioned according to the information of the user equipment.

10. The system of claim 9, further comprising:

and the network equipment is used for receiving the information of the user equipment from the network node, acquiring the coverage condition of the cell where the user equipment is located according to the information of the user equipment, and informing the network node to optimize the reference symbol of the cell where the user equipment is located according to the coverage condition.

11. An apparatus for optimizing cell reference symbols, comprising:

a receiving module, configured to receive a measurement event from a UE;

a determining module, electrically connected to the receiving module, for determining information of the UE according to the measurement event;

and the optimization module is electrically connected with the determination module and used for optimizing the reference symbol of the cell where the UE is located according to the information of the UE.

12. The apparatus of claim 11, wherein the receiving module is specifically configured to receive an a2 event from the UE, the a2 event being an event that a serving cell measurement quality is below a preset first threshold; or

Receiving an A3 event from the UE, wherein the A3 event is an event that the measurement quality of the serving cell or the measurement quality of the neighbor cell is greater than a preset second threshold value.

13. The apparatus of claim 12, further comprising:

the recording module is electrically connected with the receiving module and is used for recording the time information corresponding to the A2 event received by the receiving module; and recording time information corresponding to the received measurement report event when the measurement report event from the UE is received.

14. The apparatus of claim 13, wherein the determining module is specifically configured to determine the UE information according to the time information corresponding to the a2 event and the time information corresponding to the measurement report event, and determine the UE information as a weak coverage user when a difference between the time information corresponding to the measurement report event and the time information corresponding to the a2 event exceeds a preset first value.

15. The apparatus of claim 14, further comprising:

the counting module is electrically connected with the determining module and used for counting the proportion of the weak coverage users of the cell in which the UE is located when the determining module determines that the UE information is that the UE is the weak coverage user;

the determining module is further configured to determine that the cell in which the UE is located is a weak coverage cell when the ratio of the weak coverage users of the cell in which the UE is located, counted by the counting module, exceeds a preset second value; or

The apparatus further comprises:

the reporting module is electrically connected with the determining module and is used for reporting the information of the weak coverage user existing in the cell where the UE is located to network equipment when the determining module determines that the UE information is that the UE is the weak coverage user, so that the network equipment counts the reporting frequency of the cell where the UE is located;

the receiving module is further configured to receive, from the network device, information that it is determined that the cell where the UE is located is a weak coverage cell when the reporting frequency of the cell where the UE is located, which is counted by the network device, exceeds a preset third value and the frequency of reporting, in the neighboring cell of the cell where the UE is located, that the weak coverage user information exists exceeds a preset fourth value;

the determining module is further configured to determine, according to the information that the cell where the UE is located is the weak coverage cell received by the receiving module, that the cell where the UE is located is the weak coverage cell.

16. The apparatus of claim 12, wherein the determining module is specifically configured to determine that the UE information is that the UE is an over-coverage user when the receiving module receives an a3 event from the UE.

17. The apparatus of claim 16, wherein the counting module is configured to count a proportion of over-covered users in a cell in which the UE is located, when the determining module determines that the UE information is that the UE is an over-covered user;

the determining module is further configured to determine that the cell in which the UE is located is an over-coverage cell when the ratio of the over-coverage users of the cell in which the UE is located, which is counted by the counting module, exceeds a preset fifth value; or

The reporting module is used for reporting the information of the over-coverage user existing in the cell where the UE is located to network equipment when the determining module determines that the UE information is the over-coverage user, so that the network equipment counts the reporting frequency of the cell where the UE is located;

the receiving module is further configured to receive, from the network device, information that it is determined that the cell where the UE is located is an over-coverage cell when the reporting frequency of the cell where the UE is located, which is counted by the network device, exceeds a preset sixth numerical value and the frequency of the over-coverage user information reported by the neighboring cell of the cell where the UE is located exceeds a preset seventh numerical value;

the determining module is further configured to determine, according to the information that the cell where the UE is located is the weak coverage cell received by the receiving module, that the cell where the UE is located is the weak coverage cell.

18. The apparatus according to claim 15 or 17, wherein the optimizing module is specifically configured to, when the cell in which the UE is located is a weak coverage cell, increase the transmit power for transmitting the cell reference symbol to the cell in which the UE is located; or

And when the cell in which the UE is positioned is the over-coverage cell, reducing the transmitting power for transmitting the cell reference symbol to the cell in which the UE is positioned.

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