CN102740360A - Cell load control method and apparatus thereof - Google Patents

Abstract

The invention provides a cell load control method and an apparatus thereof. The method comprises the following steps that: when a first cell is overloaded, the first cell selects one or more UE from the UE which is served by the first cell to carry out service transfer; a service of the UE in the selected first cell is transferred to the other cell where cooperative multi-point (CoMP) cells are concentrated, wherein the CoMP cells serve the selected UE. By using the scheme of the invention, even if the UE does not generate switching or drop calls, the load of the cell can be effectively reduced so as to reduce a drop-call rate of the UE, reduce a switching rate of the UE and increase a KPI index of a system.

Description

Method and device for controlling load in a residential area

technical field

The present invention relates to the field of mobile communication, in particular to a load control method and device in a CoMP (Cooperative Multi-Point, coordinated multi-point) transmission system.

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 LTE system, when the load of the cell reaches the preset threshold, the method of load balancing and load control is usually used to reduce the load of the cell, that is, to select a UE in the cell and switch it to the target cell; or a call drop occurs . These two methods are used to ensure the quality of service provided by the cell. The handover process is relatively complicated, and call drop will seriously affect the KPI index of the network. These two methods of reducing the load of the cell have their own inherent shortcomings that are difficult to overcome.

In LTE-A, CoMP transmission technology has been formally studied as a candidate technology. The basic principle is that multiple cells with strong interference to edge users reduce the interference to cell edge users through joint scheduling, and further increase the receiving power of cell edge users through joint transmission, thereby improving the experience of cell edge users. The characteristics of coordinated multi-point transmission technology are:

1) Multiple cells cooperate on the same radio resource and jointly serve a UE;

2) Each cell serves one or more UEs simultaneously on the same radio resource.

After the CoMP transmission technology is introduced in LTE_A, the way of cell load management will change. At present, there is no method for cell load management under the CoMP transmission technology in the existing published patents.

Contents of the invention

The present invention provides a cell load control method and device to solve the problem of how to realize cell load management in a CoMP transmission system. In order to solve the problems of the technologies described above, the present invention provides the following technical solutions:

A cell load control method, comprising:

When the load of the first cell is overloaded, the first cell selects one or more UEs from the user equipment UEs it serves to perform service transfer;

Transferring the service of the selected UE in the first cell to other cells in the CoMP cell set serving the selected UE.

Preferably, transferring the service of the selected UE in the first cell to other cells in the CoMP cell set serving the selected UE includes:

If the first cell is a primary cell in the CoMP cell set, the first cell transfers the service of the selected UE to a secondary cell in the CoMP cell set;

If the first cell is a secondary cell in the CoMP cell set, the first cell sends a load overload indication to the primary cell in the CoMP cell set, notifying the primary cell to transfer the selected UE in the first cell business.

Preferably, selecting one or more UEs from UEs served by the first cell for service transfer includes:

The first cell selects one or more UEs to form a candidate UE queue according to the service throughput and/or priority of the UEs it serves, and sequentially transfers the services of the UEs in the candidate UE queue until the first cell The load of the community is normal.

preferred,

If the first cell is the primary cell in the CoMP cell set, the first cell transfers the service of the selected UE to the secondary cell in the CoMP cell set, including:

The first cell transfers the service of the selected UE to one or more secondary cells in the CoMP cell set according to the load condition of the secondary cell of the selected UE, and transmits or receives service data of the selected UE. The physical resource informs the one or more secondary cells.

preferred,

The load overload indication includes: the ID of the first cell, the ID of the selected UE, the service information to be transferred by the selected UE, and the bearer information to be transferred by the selected UE;

After the primary cell receives the load overload indication, it transfers the service of the selected UE in the first cell to the primary cell and/or other secondary cells according to its own load conditions and load conditions of other secondary cells ; If transferred to another secondary cell, the primary cell will also notify the other secondary cell of the physical resource for receiving or sending the service data of the selected UE.

In order to solve the above technical problems, the present invention also provides a cell load control device, including a UE selection module and a service transfer module;

The UE selection module is configured to select one or more UEs from the UEs served by the first cell to send to the load transfer module when the load overload of the first cell is detected;

The load transfer module is configured to transfer the service of the UE selected by the UE selection module in the first cell to other cells in the CoMP cell set serving the UE.

Preferably, if the first cell is the primary cell serving the CoMP cell set, the load transfer module is used to transfer the service of the UE selected by the UE selection module to the secondary cell in the CoMP cell set in the community;

If the first cell is a secondary cell in the CoMP cell set serving the UE selected by the UE selection module, the load transfer module is configured to send a load overload indication to the primary cell in the CoMP cell set to notify the primary cell The cell transfers the service of the UE selected by the UE selection module in the first cell.

Preferably, the UE selection module is configured to select one or more UEs to form a candidate UE queue according to the service throughput and/or priority of the UEs served by the first cell, and sequentially select the UEs in the candidate UE queue sent to the load transfer module by the UE until it is detected that the load of the first cell is below the threshold.

Preferably, if the first cell is the primary cell in the CoMP cell set serving the selected UE, the load transfer module is configured to transfer the load of the secondary cell of the UE selected by the UE selection module The service of the selected UE is transferred to one or more secondary cells in the CoMP cell set, and the physical resources for receiving or sending the service data of the selected UE are notified to the one or more secondary cells.

Preferably, the load overload indication sent by the load transfer module includes: the ID of the first cell, the ID of the selected UE, the service information to be transferred by the selected UE, and the bearer information to be transferred by the selected UE;

The load transfer module is further configured to receive a load overload indication sent by the second cell, and select the UE selected by the second cell according to the load condition of the first cell and the load condition of other secondary cells of the UE selected by the second cell The service in the second cell is transferred to the first cell and/or another secondary cell of the UE selected by the second cell; if the service is transferred to another secondary cell of the UE selected by the second cell, it is also used To inform other secondary cells of the UE selected by the second cell of the physical resource for receiving or sending the service data of the UE selected by the second cell.

By adopting the scheme of the present invention, even if the UE is not switched or called dropped, the load of the cell can be effectively reduced, the dropped call rate of the UE is reduced, the probability of UE switched is reduced, and the KPI index of the system is improved.

Description of drawings

FIG. 1 is a schematic diagram of a CoMP cell set in the present invention;

Fig. 2 is the flow chart of cell load control of the embodiment of the present invention;

Fig. 3 is the schematic diagram of application example 1 of the present invention;

Fig. 4 is the schematic diagram of the second application example of the present invention;

Fig. 5 is the schematic diagram of the third application example of the present invention;

Fig. 6 is a schematic diagram of application example 4 of the present invention;

Fig. 7 is a schematic diagram of the fifth application example of the present invention;

Fig. 8 is a schematic diagram of application example 6 of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

The present invention is based on the CoMP technology. One CoMP cell set serves one UE. As shown in FIG. 1 , cells 1, 2, 3 and 7 form a CoMP cell set to serve the UE at the same time. Among them, cell 1 is the primary cell, which performs unified scheduling of all cell resources in the CoMP cell set, and has signaling interaction with the UE; as shown in Figure 1, cells 2, 3 and 7 are secondary cells, assisting the primary cell to serve the UE.

The present invention provides a cell load control method, comprising:

When the load of the first cell is overloaded, the first cell selects one or more UEs from the user equipment UEs it serves to perform service transfer;

Transferring the service of the selected UE in the first cell to other cells in the CoMP cell set serving the selected UE.

The cell load control device of the present invention includes a UE selection module and a service transfer module;

The UE selection module is configured to select one or more UEs from the UEs served by the first cell to send to the load transfer module when the load overload of the first cell is detected;

The load transfer module is configured to transfer the service of the UE selected by the UE selection module in the first cell to other cells in the CoMP cell set serving the UE.

Preferably, if the first cell is the primary cell serving the CoMP cell set, the load transfer module is used to transfer the service of the UE selected by the UE selection module to the secondary cell in the CoMP cell set in the community;

If the first cell is a secondary cell in the CoMP cell set serving the UE selected by the UE selection module, the load transfer module is configured to send a load overload indication to the primary cell in the CoMP cell set to notify the primary cell The cell transfers the service of the UE selected by the UE selection module in the first cell.

Preferably, the UE selection module is configured to select one or more UEs to form a candidate UE queue according to the service throughput and/or priority of the UEs served by the first cell, and sequentially select the UEs in the candidate UE queue sent to the load transfer module by the UE until it is detected that the load of the first cell is below the threshold.

Preferably, if the first cell is the primary cell in the CoMP cell set serving the selected UE, the load transfer module is configured to transfer the load of the secondary cell of the UE selected by the UE selection module The service of the selected UE is transferred to one or more secondary cells in the CoMP cell set, and the physical resources for receiving or sending the service data of the selected UE are notified to the one or more secondary cells.

Preferably, the load overload indication sent by the load transfer module includes: the ID of the first cell, the ID of the selected UE, the service information to be transferred by the selected UE, and the bearer information to be transferred by the selected UE;

The load transfer module is further configured to receive a load overload indication sent by the second cell, and select the UE selected by the second cell according to the load condition of the first cell and the load condition of other secondary cells of the UE selected by the second cell The service in the second cell is transferred to the first cell and/or another secondary cell of the UE selected by the second cell; if the service is transferred to another secondary cell of the UE selected by the second cell, it is also used To inform other secondary cells of the UE selected by the second cell of the physical resource for receiving or sending the service data of the UE selected by the second cell.

FIG. 2 is a specific flow chart of an embodiment of the cell compliance control method of the present invention.

Step 201, cell A detects that its own load is overloaded;

Step 202, select N (N is a positive integer) UEs to form a candidate UE queue according to the service throughput and/or priority of UEs served by cell A;

Step 203, judging whether cell A is the primary cell in the CoMP cell set of the first UE in the candidate UE queue, if yes, execute step 204, if not, execute step 210;

Step 204, cell A transfers the service of the head UE to the secondary cell in the CoMP cell set;

Cell A transfers the service of the UE to one or more secondary cells in the CoMP cell set according to the load condition of the secondary cell, and notifies the one or more secondary cells of the physical resource for receiving or sending the service data of the UE;

Optionally, cell A may select the secondary cell with the least load, or select multiple secondary cells with relatively small load to receive or send the service data of the UE;

Optionally, cell A may notify the one or more secondary cells of the physical resource for receiving or sending service data of the UE through a MAC scheduling instruction.

Step 205, the secondary cell receives the MAC scheduling instruction, and sends a scheduling success response to cell A after accepting the scheduling;

Step 206, cell A releases the service of the UE;

Step 207, cell A detects whether the cell load is normal, if so, end the process, if not, execute step 208;

Step 208, delete the UE that has performed service transfer in the candidate UE queue, and decrement the value of N by 1;

Step 209, judge whether the value of N is equal to 0, if so, execute step 202; if not, execute step 203;

Step 210, cell A sends a load overload indication to the primary cell of the first UE, informing the primary cell that the service of the UE needs to be transferred;

Optionally, the load overload indication may include the ID of the current cell, the ID of the selected UE, service information to be transferred by the selected UE, and bearer information to be transferred by the selected UE;

Step 211, the primary cell judges whether its own load can carry the service to be transferred by the UE, if so, execute step 212; if not, execute step 214;

Step 212, the main cell transfers the service to be transferred to the main cell;

Step 213, the primary cell sends a scheduling success response to cell A, and executes step 206;

Step 214, the primary cell transfers the service to be transferred to other secondary cells of the UE;

In step 215, other secondary cells that have received the scheduling instruction send a scheduling success response to the primary cell, and the primary cell forwards it to cell A, and step 206 is performed.

The following are application examples of the present invention:

Application example 1: The uplink load of cell 1 is overloaded, UE1 is selected for service transfer, and cell 1 is the main cell of UE1

As shown in FIG. 3 , under normal circumstances, the uplink service of UE1 is shared by the primary cell (cell 1 ) and the secondary cell (cell 2 ). Which part of UE1's uplink service is undertaken by the primary cell and which part is undertaken by the secondary cell is uniformly coordinated by the primary cell. The primary cell and the secondary cell respectively receive uplink data of the UE, and the secondary cell transmits the received uplink data to the primary cell, and the primary cell transmits all uplink data of UE1 to the core network.

After cell 1 detects that its own load is overloaded, it selects UE1 for service transfer. Since cell 1 is the primary cell of UE1, the primary cell will coordinate resources with UE1's secondary cell at this time. The primary cell no longer receives UE1's uplink services. The secondary cell is responsible for all uplink services of UE1, and then sends the UE's uplink data to the primary cell through the X2 port, and the primary cell sends it to the core network.

Application example 2: The downlink load of cell 1 is overloaded, UE1 is selected for service transfer, and cell 1 is the main cell of UE1

As shown in Figure 4, under normal circumstances, the core network transmits downlink data to the primary cell (cell 1) of UE1, and the primary cell performs resource coordination and scheduling, and the primary cell and the secondary cell (cell 2) share the downlink service data of UE1. And schedule which ones are transmitted to UE1 by the secondary cell (cell 2 ), and which ones are directly transmitted to UE1 by the primary cell.

When cell 1 detects that its own load is overloaded, UE1 is selected for service transfer. Since cell 1 is the primary cell of UE1, all downlink data transmitted from the core network to the primary cell is dispatched by the primary cell to the secondary cell of UE1. No longer serve the downlink service of the candidate UE.

Application example 3: The uplink load of cell 2 is overloaded, UE1 is selected for service transfer, and cell 2 is the secondary cell of UE1

As shown in FIG. 5 , under normal circumstances, the uplink service of UE1 is shared by the primary cell (cell 1 ) and the secondary cell (cell 2 ). Which part of UE1's uplink service is undertaken by the primary cell and which part is undertaken by the secondary cell is uniformly coordinated by the primary cell. The primary cell and the secondary cell respectively receive the uplink data of UE1, and the secondary cell transmits the received uplink data to the primary cell, and the primary cell transmits all the uplink data of UE1 to the core network.

After Cell 2 detects that its own load is overloaded, it selects UE1 for service transfer. Since Cell 2 is the secondary cell of UE1, Cell 2 sends a load overload indication to the primary cell (Cell 1) of UE1 and informs the primary cell of the ID of Cell 2. UE1's ID, service bearer information, service transmission status and other information, the primary cell will decide whether the primary cell itself or other secondary cells should undertake the uplink of UE1 that was originally undertaken by cell 2 according to the load conditions of itself and other secondary cells. business.

Under the condition that the main cell’s own load allows, the uplink business of UE1 originally undertaken by cell 2 is assumed by the main cell. When performing resource coordination and scheduling, the main cell receives all the uplink business data of UE1 and sends it to the core network. Cell 2 no longer receives the uplink service data of UE1.

Application example 4: The downlink load of cell 2 is overloaded, UE1 is selected for service transfer, and cell 2 is the secondary cell of UE1

As shown in Figure 6, under normal circumstances, the core network transmits downlink data to the primary cell (cell 1) of UE1, and the primary cell performs resource coordination and scheduling, and the primary cell and the secondary cell (cell 2) share the downlink service data of UE1. And schedule which ones are transmitted to UE1 by the secondary cell (cell 2 ), and which ones are directly transmitted to UE1 by the primary cell.

When cell 2 detects that its own load is overloaded, it selects UE1 for service transfer. Since cell 2 is the secondary cell of UE1, cell 2 sends a load overload indication to the primary cell (cell 1) of UE1 and informs the primary cell of the ID of cell 2. UE1 ID, service bearer information, service transmission status and other information, the primary cell will decide whether the downlink data of UE1 originally borne by cell 2 should be borne by the primary cell itself or by other secondary cells according to the load conditions of itself and other secondary cells. The community will take care of it.

Under the condition that the main cell’s own load allows, the uplink service of UE1 that was originally undertaken by cell 2 is assumed by the main cell. During resource coordination and scheduling, cell 2 is no longer allowed to receive the downlink data of UE1, and the main cell receives from the core network. The downlink data of UE1 is directly transmitted to UE1. .

Application example 5: The uplink load of cell 2 is overloaded, UE1 is selected for service transfer, and cell 2 is the secondary cell of UE1

As shown in FIG. 7 , under normal circumstances, the uplink service of UE1 is shared by the primary cell (cell 1 ) and the secondary cell (cell 2 and cell 3 ). Which part of UE1's uplink service is undertaken by the primary cell, and which part is undertaken by cell 2 and cell 3, are all coordinated by the primary cell. The primary cell and the secondary cell respectively receive the uplink data of UE1, and the secondary cell transmits the received uplink data to the primary cell, and the primary cell transmits all the uplink data of UE1 to the core network.

After Cell 2 detects that its own load is overloaded, it selects UE1 for service transfer. Since Cell 2 is the secondary cell of UE1, Cell 2 sends a load overload indication to the primary cell (Cell 1) of UE1 and informs the primary cell of the ID of Cell 2. UE1's ID, service bearer information, service transmission status and other information, the primary cell will decide whether the primary cell itself or other secondary cells should undertake the uplink of UE1 that was originally undertaken by cell 2 according to the load conditions of itself and other secondary cells. business.

The primary cell judges that its own load can no longer undertake the service indicated in the load overload indication, and schedules the service to another secondary cell (cell 3), and the cell 3 carries the service to ensure the QoS of the service. The primary cell will send the uplink data of UE1 to the primary cell, and the primary cell will send all the uplink data of UE1 to the core network.

Application example 6: The downlink load of cell 2 is overloaded, UE1 is selected for service transfer, and cell 2 is the secondary cell of UE1

As shown in Figure 8, under normal circumstances, the core network transmits downlink data to the primary cell (cell 1) of UE1, and the primary cell performs resource coordination and scheduling. Service data, and schedule which ones are transmitted to UE1 by the secondary cell (cell 1 and cell 2), and which ones are directly transmitted to UE1 by the primary cell.

When cell 2 detects that its own load is overloaded, it selects UE1 for service transfer. Since cell 2 is the secondary cell of UE1, cell 2 sends a load overload indication to the primary cell (cell 1) of UE1 and informs the primary cell of the ID of cell 2. UE1 ID, service bearer information, service transmission status and other information, the primary cell will decide whether the downlink data of UE1 originally borne by cell 2 should be borne by the primary cell itself or by other secondary cells according to the load conditions of itself and other secondary cells. The community will take care of it.

The primary cell judges that its own load can no longer bear the service indicated in the load overload indication, and schedules the service to another secondary cell (cell 3), and the cell 3 bears the service. After receiving the downlink data of UE1 delivered by the core network, the primary cell transmits the downlink data previously undertaken by cell 2 to cell 3, and then cell 3 sends it to UE1.

Optionally, all or part of the steps in the above embodiments can also be implemented using integrated circuits, and these steps can be fabricated into individual integrated circuit modules, or multiple modules or steps among them can be fabricated into a single integrated circuit module accomplish. As such, the present invention is not limited to any specific combination of hardware and software.

The devices/functional modules/functional units in the above embodiments can be realized by general-purpose computing devices, and they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices.

When each device/functional module/functional unit in the above-mentioned embodiments is realized in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. The computer-readable storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope described in the claims.

Claims (10)

1. A cell load control method, characterized in that, comprising: When the load of the first cell is overloaded, the first cell selects one or more UEs from the user equipment UEs it serves to perform service transfer; Transferring the service of the selected UE in the first cell to other cells in the set of coordinated multi-point CoMP cells serving the selected UE. 2. The method according to claim 1, wherein transferring the service of the selected UE in the first cell to other cells in the CoMP cell set serving the selected UE comprises: If the first cell is a primary cell in the CoMP cell set, the first cell transfers the service of the selected UE to a secondary cell in the CoMP cell set; If the first cell is a secondary cell in the CoMP cell set, the first cell sends a load overload indication to the primary cell in the CoMP cell set, notifying the primary cell to transfer the selected UE in the first cell business. 3. The method according to claim 1 or 2, wherein selecting one or more UEs from the UEs served by the first cell for service transfer comprises: The first cell selects one or more UEs to form a candidate UE queue according to the service throughput and/or priority of the UEs it serves, and sequentially transfers the services of the UEs in the candidate UE queue until the first cell The load of the community is normal. 4. The method of claim 2, wherein, If the first cell is the primary cell in the CoMP cell set, the first cell transfers the service of the selected UE to the secondary cell in the CoMP cell set, including: The first cell transfers the service of the selected UE to one or more secondary cells in the CoMP cell set according to the load condition of the secondary cell of the selected UE, and transmits or receives service data of the selected UE. The physical resource informs the one or more secondary cells. 5. The method of claim 2, wherein, The load overload indication includes: the ID of the first cell, the ID of the selected UE, the service information to be transferred by the selected UE, and the bearer information to be transferred by the selected UE; After the primary cell receives the load overload indication, it transfers the service of the selected UE in the first cell to the primary cell and/or other secondary cells according to its own load conditions and load conditions of other secondary cells ; If transferred to another secondary cell, the primary cell will also notify the other secondary cell of the physical resource for receiving or sending the service data of the selected UE. 6. A cell load control device, comprising a UE selection module and a service transfer module; The UE selection module is configured to select one or more UEs from the UEs served by the first cell to send to the load transfer module when the load of the first cell is overloaded; The load transfer module is configured to transfer the service of the UE selected by the UE selection module in the first cell to other cells in the CoMP cell set serving the UE. 7. The apparatus of claim 6, wherein If the first cell is the primary cell in the CoMP cell set, the load transfer module is configured to transfer the service of the UE selected by the UE selection module to the secondary cell in the CoMP cell set; If the first cell is a secondary cell serving the CoMP cell set, the load transfer module is configured to send a load overload indication to the primary cell in the CoMP cell set, and notify the primary cell to transfer the UE selection module Traffic of the selected UE in the first cell. 8. Apparatus as claimed in claim 6 or 7, characterized in that, The UE selection module is used to select one or more UEs to form a candidate UE queue according to the service throughput and/or priority of the UEs served by the first cell, and sequentially send UEs in the candidate UE queue to the load transfer module until it is detected that the load of the first cell is below the threshold. 9. The apparatus of claim 7, wherein: If the first cell is the primary cell serving the CoMP cell set, the load transfer module is configured to transfer the service of the selected UE according to the load condition of the secondary cell of the UE selected by the UE selection module to one or more secondary cells in the CoMP cell set, and notify the one or more secondary cells of the physical resource for receiving or sending service data of the selected UE. 10. The apparatus of claim 7, wherein: The load overload indication sent by the load transfer module includes: the ID of the first cell, the ID of the selected UE, the service information to be transferred by the selected UE, and the bearer information to be transferred by the selected UE; The load transfer module is further configured to receive a load overload indication sent by the second cell, and select the UE selected by the second cell according to the load condition of the first cell and the load condition of other secondary cells of the UE selected by the second cell The service in the second cell is transferred to the first cell and/or another secondary cell of the UE selected by the second cell; if the service is transferred to another secondary cell of the UE selected by the second cell, it is also used To inform other secondary cells of the UE selected by the second cell of the physical resource for receiving or sending the service data of the UE selected by the second cell.

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