CN102685776A - Method for reducing cell load through CoMP technology and cell - Google Patents

Abstract

The present invention discloses a method for reducing the load of a cell through CoMP technology, including: when the load of the cell reaches a preset value, selecting a user equipment UE; when the cell is the primary cell of the CoMP cell set of the UE, changing a coordinated cell of the UE to be the primary cell; when the cell is a coordinated cell of the CoMP cell set of the UE, withdrawing from the CoMP cell set of the UE; and deleting the UE. The method and the cell for reducing the load of the cell through the CoMP technology provided by the present invention can effectively reduce the load of the cell while avoiding the handover or call drop of the UE, reduce the call drop rate of the UE and the probability of handover, and improve the system key performance indicators.

Description

Method and cell for reducing cell load through CoMP technology

technical field

The present invention relates to the communication field, in particular to a method and a cell for reducing cell load through CoMP technology.

Background technique

In the load management scenario of the existing mobile communication system, handover or call drop is usually used to reduce the load of the cell. For the Long Term Evolution (LTE) system, when the load of the cell reaches the set threshold, the method of load balancing and load control is usually used to reduce the load of the cell, that is, a User Equipment (UE) of the cell is selected. ), so that it is handed over to the target cell; or a service call drop occurs. These two methods are used to ensure the quality of service provided by the cell, but these two handovers will affect the service quality of the UE being handed over or the UE where a service call is dropped, and reduce user experience.

Contents of the invention

The main purpose of the present invention is to provide a method and a cell for reducing cell load through CoMP technology, and reduce cell load without affecting UE service quality.

The present invention proposes a method for reducing cell load through CoMP technology, including:

When the cell load reaches a preset value, select a user equipment UE;

When the cell is the primary cell of the CoMP cell set of the UE, changing a coordinated cell of the UE to the primary cell;

When the cell is a coordinated cell of the CoMP cell set of the UE, withdraw from the CoMP cell set of the UE;

Delete the UE.

Preferably, after performing the deleting UE, it further includes:

The primary cell of the UE decides whether to add a coordinated cell according to the service quality of the UE.

Preferably, after performing said changing a coordinated cell of the UE to the primary cell when the cell is the primary cell of the CoMP cell set of the UE, the method further includes:

Notifying other coordinated cells of the UE of the changed primary cell.

Preferably, when the cell load reaches a preset value, selecting a user equipment UE includes:

Select a UE according to the priority of each UE in the cell, the throughput of the existing service and the quality of the service channel.

Preferably, when the cell is the primary cell of the UE's CoMP cell set, changing a coordinated cell of the UE to the primary cell includes:

Obtain the load and business service quality information of each cooperative cell;

According to the load and service quality information of each coordinated cell, select a coordinated cell as the changed primary cell, and withdraw from the CoMP cell set of the UE.

The present invention also proposes a cell that reduces cell load through CoMP technology, including:

A UE selection module, configured to select a user equipment UE when the cell load reaches a preset value;

A change module, configured to change a coordinated cell of the UE to the primary cell when the cell is the primary cell of the CoMP cell set of the UE;

An exit module, configured to exit the UE's CoMP cell set when the cell is a coordinated cell of the UE's CoMP cell set;

A deletion module, configured to delete the UE.

Preferably, the cell that reduces the load of the cell through the CoMP technology further includes:

A newly added module is used to decide whether to add a coordinated cell according to the service quality of the UE.

Preferably, the cell that reduces the load of the cell through the CoMP technology further includes:

A notification module, configured to notify other coordinated cells of the UE of the changed primary cell.

Preferably, the UE selection module is also used for:

Select a UE according to the priority of each UE in the cell, the throughput of the existing service and the quality of the service channel.

Preferably, the change module includes:

An acquisition unit, configured to acquire load and business service quality information of each coordinated cell;

The selection unit is configured to select a coordinated cell as the changed primary cell according to the load and service quality information of each coordinated cell, and withdraw from the CoMP cell set of the UE.

The method and the cell for reducing the load of the cell through the CoMP technology provided by the present invention can effectively reduce the load of the cell while avoiding the handover or call drop of the UE, reduce the call drop rate of the UE and the probability of handover, and improve the system The key performance indicators (Key Performance Index, KPI).

Description of drawings

FIG. 1 is a schematic flow diagram of an embodiment of a method for reducing cell load through CoMP technology in the present invention;

FIG. 2 is a schematic flow diagram of another embodiment of the method for reducing cell load through CoMP technology in the present invention;

FIG. 3 is a schematic flow chart of the change process in an embodiment of the method for reducing cell load by CoMP technology in the present invention;

FIG. 4 is a schematic flowchart of an embodiment of a cell that reduces cell load through CoMP technology in the present invention;

FIG. 5 is a schematic flowchart of another embodiment of a cell that reduces cell load through CoMP technology in the present invention;

Fig. 6 is a schematic flow diagram of a changing module in an embodiment of a cell in which the cell load is reduced by the CoMP technology in the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to FIG. 1, an embodiment of a method for reducing cell load through CoMP technology in the present invention is proposed, including:

Step S10, when the cell load reaches a preset value, select a user equipment UE;

When the load of the cell exceeds a preset value, it is considered that the cell is overloaded, and the cell selects a UE from the UE instances in the CoMP cell set as the UE for load control. The purpose is to reduce the number of UEs in the cell and quickly Reduce community load.

Step S11, when the cell is the primary cell of the UE's CoMP cell set, changing a coordinated cell of the UE to the primary cell;

After the UE is selected, it judges whether the overloaded cell belongs to the primary cell in the CoMP cell set of the UE, and if so, triggers the primary cell migration load control process: the primary cell, that is, the cell with overloaded load, first communicates with each cooperative cell of the UE, and then Select a cooperating cell among the coordinating cells, and then negotiate with the cooperating cell to migrate the primary cell to the cooperating cell.

Step S12, when the cell is a cooperating cell of the CoMP cell set of the UE, withdraw from the CoMP cell set of the UE;

If the overloaded cell is the coordinated cell of the UE, the coordinated cell migration load control process is triggered: the coordinated cell sends a load overload indication to the primary cell, notifying the primary cell that it is about to delete the UE. The content of the message includes but is not limited to the following information: The coordinated cell ID, the ID of the UE, the service quality information of the UE service, and the like.

Step S13, delete the UE.

When the overloaded cell is the primary cell of the CoMP cell set of the UE, after changing a cooperating cell of the UE to the primary cell, the cell locally deletes the UE. Or, when the overloaded cell is a cooperating cell of the UE's CoMP cell set, after exiting the UE's CoMP cell set, the UE is also deleted locally.

In this embodiment, the load-overloaded cell effectively reduces the load of the cell while avoiding UE handover or call drop, reduces the UE call drop rate and the probability of handover, and improves the key performance index of the system.

Referring to FIG. 2 , another embodiment of the method for reducing the load of a cell through the CoMP technology of the present invention is proposed. After step S11 is performed, it further includes:

Step S14 , notifying other coordinated cells of the UE of the changed primary cell.

The overloaded cell selects a coordinated cell from the coordinated cells as the changed primary cell, negotiates with the coordinated cell, migrates the primary cell to the coordinated cell, and then sends a primary cell change notification to other coordinated cells.

After step S13 is performed, it also includes:

Step S15, the primary cell of the UE decides whether to add a coordinated cell according to the service quality of the UE.

After the primary cell migrates or the coordinated cell exits the CoMP cell set, the primary cell in the CoMP cell set decides whether to expand the CoMP cell based on factors such as the load of each coordinated cell in the current CoMP cell set, UE service channel quality, and UE service quality. set. If it needs to be added, look for cells other than the coordinated cell and the original primary cell in the neighboring cells, and ask the UE to report the downlink channel quality status of these cells, and ask these cells to feed back their own load, resource usage, and uplink channel quality In this situation, the primary cell selects a new coordinated cell according to the above information and the service quality requirements of the UE. Finally, the primary cell sends a reconfiguration message to the UE. The message carries the latest CoMP set cell information. After receiving the message, the UE responds with a reconfiguration complete message and performs data transmission with the latest CoMP set cell.

In this embodiment, when the overloaded cell reduces the load by migrating the primary cell or exiting the CoMP cell set, the changed primary cell notifies other cooperating cells of the above changes, and decides whether to add a cooperating cell according to the service quality of the UE , in preparation for subsequent load reduction.

In the above embodiment, step S10 may include:

Select a UE according to the priority of each UE in the cell, the throughput of the existing service and the quality of the service channel.

When the load of the cell exceeds a preset value, the cell selects a UE from UE instances in the CoMP cell set as a UE for load control. The selection principle can be: comprehensively consider factors such as the priority of each UE, the throughput of existing services, and the quality of service channels, and select UEs with lower user priority, higher service throughput, and poorer service channel quality as UEs for load reduction .

In this embodiment, UEs for load control are selected based on the overall conditions of UEs in the cell, and other methods that can be used for selecting UEs for load control are also applicable to the present invention.

Referring to FIG. 3, in the above embodiment, step S11 may include:

Step S111, obtaining load and business service quality information of each coordinated cell;

When the overloaded cell is the primary cell of the CoMP cell set of the selected UE, the overloaded cell first communicates with each cooperating cell of the UE to obtain information such as the load of the cooperating cell and the quality of the service channel of the UE.

Step S112 , according to the load and service quality information of each coordinated cell, select a coordinated cell as the changed primary cell, and withdraw from the CoMP cell set of the UE.

A cell with an overloaded load selects a cell with a lower load and a better UE service channel quality from the coordinated cells. After negotiating with the coordinated cell, the primary cell is migrated to the coordinated cell. It can also be selected according to the actual situation.

Referring to FIG. 4 , an embodiment of the present invention is proposed to reduce the load of the cell through the CoMP technology, including:

A UE selection module 10, configured to select a user equipment UE when the cell load reaches a preset value;

A change module 20, configured to change a coordinated cell of the UE to the primary cell when the cell is the primary cell of the CoMP cell set of the UE;

An exit module 30, configured to exit the UE's CoMP cell set when the cell is a coordinated cell of the UE's CoMP cell set;

The deletion module 40 is configured to delete the UE.

When the load of the cell exceeds a preset value, it is considered that the load of the cell is overloaded, and the UE selection module 10 selects a UE from the UE instances in the CoMP cell set as the UE for load control. The purpose is to reduce the number of UEs in the cell, and in a short time Rapidly reduce the load of the community.

After the UE is selected, it is judged whether the overloaded cell belongs to the primary cell in the UE's CoMP cell set, and if so, the primary cell migration load control process is triggered: the change module 20 first communicates with each coordinated cell of the UE, and selects the UE from each coordinated cell Select a cooperating cell, and then negotiate with the cooperating cell to migrate the main cell to the cooperating cell.

If the overloaded cell is the cooperative cell of the UE, the coordinated cell migration load control process is triggered: the exit module 30 sends a load overload indication to the primary cell, notifying the primary cell that it is about to delete the UE, and the content of the message includes but not limited to the following information : The coordinated cell ID, UE ID, UE service quality of service information, etc.

When the overloaded cell is the primary cell of the UE's CoMP cell set, after changing a cooperating cell of the UE to the primary cell, the deletion module 40 deletes the UE. Or, when the overloaded cell is a cooperating cell of the CoMP cell set of the UE, after exiting the CoMP cell set of the UE, the deleting module 40 also deletes the UE.

In this embodiment, the load-overloaded cell effectively reduces the load of the cell while avoiding UE handover or call drop, reduces the UE call drop rate and the probability of handover, and improves the key performance index of the system.

Referring to FIG. 5 , another embodiment of the present invention is proposed to reduce the load of the cell through the CoMP technology. In the previous embodiment, it also includes:

The notification module 50 is configured to notify other coordinated cells of the UE of the changed primary cell.

A newly added module 60, configured to decide whether to add a coordinated cell according to the service quality of the UE.

The overloaded cell selects a coordinated cell from the coordinated cells as the changed primary cell, negotiates with the coordinated cell, migrates the primary cell to the coordinated cell, and then sends the primary cell change notification to other coordinated cells by the notification module 50 .

After the primary cell migrates or the cooperating cell exits the CoMP cell set, the new module 60 decides whether to expand the CoMP cell set according to factors such as the load of each cooperating cell in the current CoMP cell set, UE traffic channel quality, and UE service quality. If it needs to be added, look for cells other than the coordinated cell and the original primary cell in the neighboring cells, and ask the UE to report the downlink channel quality status of these cells, and ask these cells to feed back their own load, resource usage, and uplink channel quality status, the adding module 60 selects a new coordinated cell according to the above information and the QoS requirement of the UE. Finally, send a reconfiguration message to the UE. The message carries the latest CoMP set cell information. After receiving the message, the UE responds with a reconfiguration complete message and performs data transmission with the latest CoMP set cell.

In this embodiment, when the overloaded cell reduces its load by migrating the primary cell or exiting the CoMP cell set, the notification module 50 notifies other cooperative cells of the above changes, and the adding module 60 decides whether to add a new one according to the service quality of the UE. Cooperate with the community to prepare for the subsequent load reduction.

In the above embodiments, the UE selection module 10 can also be used for:

Select a UE according to the priority of each UE in the cell, the throughput of the existing service and the quality of the service channel.

When the load of the cell exceeds a preset value, the UE selection module 10 selects a UE from UE instances in the CoMP cell set as a UE for load control. The selection principle can be: comprehensively consider factors such as the priority of each UE, the throughput of existing services, and the quality of service channels, and select UEs with lower user priority, higher service throughput, and poorer service channel quality as UEs for load reduction .

In this embodiment, UEs for load control are selected based on the overall conditions of UEs in the cell, and other methods that can be used for selecting UEs for load control are also applicable to the present invention.

Referring to Fig. 6, in the above embodiment, the change module 20 may include:

An acquisition unit 21, configured to acquire load and business service quality information of each coordinated cell;

The selection unit 22 is configured to select a coordinated cell as the changed primary cell according to the load and service quality information of each coordinated cell, and withdraw from the CoMP cell set of the UE.

When the overloaded cell is the primary cell of the CoMP cell set of the selected UE, the acquiring unit 21 first communicates with each cooperating cell of the UE to acquire the load of the coordinating cell, UE traffic channel quality, and the like. The selection unit 22 selects a cell with a relatively low load and a relatively good UE service channel quality from the coordinated cells. After negotiating with the coordinated cell, the primary cell is migrated to the coordinated cell, and withdraws from the CoMP cell set of the UE. It can also be selected according to the actual situation.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related All technical fields are equally included in the scope of patent protection of the present invention.

Claims (10)

1. A method for reducing cell load by CoMP technology, characterized in that, comprising: When the cell load reaches a preset value, select a user equipment UE; When the cell is the primary cell of the CoMP cell set of the UE, changing a coordinated cell of the UE to the primary cell; When the cell is a coordinated cell of the CoMP cell set of the UE, withdraw from the CoMP cell set of the UE; Delete the UE. 2. The method for reducing cell load through CoMP technology according to claim 1, further comprising: The primary cell of the UE decides whether to add a coordinated cell according to the service quality of the UE. 3. The method for reducing the load of a cell through CoMP technology according to claim 1 or 2, wherein, when the cell is the primary cell of the CoMP cell set of the UE, a coordinated cell of the UE is changed to After the main cell, it also includes: Notifying other coordinated cells of the UE of the changed primary cell. 4. The method for reducing cell load through CoMP technology according to claim 1 or 2, wherein when the cell load reaches a preset value, selecting a user equipment UE comprises: Select a UE according to the priority of each UE in the cell, the throughput of the existing service and the quality of the service channel. 5. The method for reducing cell load through CoMP technology according to claim 1 or 2, wherein when the cell is the primary cell of the CoMP cell set of the UE, changing a coordinated cell of the UE to the primary cell include: Obtain the load and business service quality information of each cooperative cell; According to the load and service quality information of each coordinated cell, select a coordinated cell as the changed primary cell, and withdraw from the CoMP cell set of the UE. 6. A cell for reducing cell load by CoMP technology, characterized in that, comprising: A UE selection module, configured to select a user equipment UE when the cell load reaches a preset value; A change module, configured to change a coordinated cell of the UE to the primary cell when the cell is the primary cell of the CoMP cell set of the UE; An exit module, configured to exit the UE's CoMP cell set when the cell is a coordinated cell of the UE's CoMP cell set; A deletion module, configured to delete the UE. 7. The cell for reducing cell load by CoMP technology as claimed in claim 6, further comprising: A newly added module is used to decide whether to add a coordinated cell according to the service quality of the UE. 8. The cell for reducing cell load by CoMP technology according to claim 6 or 7, further comprising: A notification module, configured to notify other coordinated cells of the UE of the changed primary cell. 9. The cell for reducing cell load by CoMP technology as claimed in claim 6 or 7, wherein the UE selection module is also used for: Select a UE according to the priority of each UE in the cell, the throughput of the existing service and the quality of the service channel. 10. The cell for reducing cell load by CoMP technology according to claim 6 or 7, wherein the changing module comprises: An acquisition unit, configured to acquire load and business service quality information of each coordinated cell; The selection unit is configured to select a coordinated cell as the changed primary cell according to the load and service quality information of each coordinated cell, and withdraw from the CoMP cell set of the UE.

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