CN105208602B - A kind of method and device of load balancing - Google Patents

Abstract

The invention discloses a load balancing method, relates to the technical field of communication, and is used for realizing the load balancing of terminals in a base station. The method provided by the present invention includes: obtaining the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell within a preset time; judging the resource occupancy rate of the primary cell , whether the resource occupancy rate of each secondary cell and the resource occupancy rate of non-CA terminals in the primary cell meet the preset conditions; when the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the non-carrier aggregation terminal When the resource occupancy rate satisfies the preset condition, the non-CA terminal currently in the primary cell with the largest resource occupancy rate is handed over to the secondary cell with the smallest resource occupancy rate. The embodiment of the present invention is applicable to the process of load balancing in the base station.

Description

A method and device for load balancing

technical field

The present invention relates to the field of communication technology, in particular to a load balancing method and device.

Background technique

Carrier aggregation technology is an important technology in LTE-Advanced. Carrier aggregation means that user data can be simultaneously transmitted on multiple component carriers (CC, Component Carrier), which is equivalent to increasing the user's transmission bandwidth. CC represents an uplink carrier or a downlink carrier. Generally, component carriers can be divided into primary component carriers (PCC, primary CC) and secondary component carriers (SCC, secondary CC) to facilitate management of component carriers, and it is stipulated that each UE has at most one uplink PCC and one downlink PCC. A downlink PCC and an uplink PCC are associated together to form a primary cell (PCell); a downlink SCC and an optional uplink SCC are associated together to form a secondary cell (SCell).

Compared with SCell, PCell has some specific properties, such as PCell cannot be deactivated, UE only performs activation/deactivation mechanism on SCell; user (UE) only transmits physical uplink control to base station (eNB) on PCell information etc. In a carrier aggregation system, an LTE-A UE can configure multiple CCs for data transmission. Considering the differences between PCC and SCC, compared with SCC, PCC needs to additionally support the transmission of physical uplink control information, some signaling and SPS scheduling service data. If a CC is used as a PCC to access too many users or services, which exceeds the maximum capacity that the CC can carry, it will lead to reconfiguration of control resources and increase a large amount of signaling overhead, and will also cause users or services to not be scheduled in time, affecting User's communication quality.

Since the user selects the resident carrier according to a certain principle, the user changes from the idle IDLE state to the connected state, and its resident carrier becomes the PCell of the user, so the distribution of users may be unbalanced on each CC under the same eNB. As a PCC, it is already in a saturated state, while the resources of other CCs as PCCs have not been fully utilized. Therefore, in the carrier aggregation system, there will be a problem of unbalanced load among CCs under the same eNB.

Contents of the invention

Embodiments of the present invention provide a method and device for load balancing, which can realize load balancing of terminals in a base station.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

The embodiment of the present invention provides a load balancing method, including:

Obtain the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell within a preset time;

Judging whether the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell meet a preset condition;

When the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of non-carrier aggregation terminals in the primary cell meet the preset conditions, the non-carrier aggregation terminal with the largest resource occupancy rate currently in the primary cell Handover to the secondary cell with the smallest resource occupancy rate.

The embodiment of the present invention also provides a load balancing device, including:

An acquisition unit, configured to acquire the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell within a preset time;

A judging unit, configured to judge whether the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell meet a preset condition;

A switching unit, configured to maximize the resource occupancy rate currently in the primary cell when the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell meet a preset condition The non-carrier aggregation terminal is handed over to the secondary cell with the smallest resource occupancy rate.

Embodiments of the present invention provide a method and device for load balancing. By obtaining the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of non-carrier aggregation terminals in the primary cell within a preset time, And based on these parameters, it is determined whether to perform load balancing, which can effectively avoid network congestion and ensure communication quality.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a flow chart of a load balancing method provided by an embodiment of the present invention;

FIG. 2 is a block diagram of a load balancing device provided by an embodiment of the present invention;

FIG. 3 is a block diagram of a load balancing device provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

A load balancing method provided by an embodiment of the present invention is applicable to a network using carrier aggregation technology. The method is executed by a base station. The specific process is shown in FIG. 1 , including:

101. Obtain the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell within a preset time.

The above parameters can be obtained by:

Receive the measurement report reported by the non-carrier aggregation terminal, the measurement report carries the RSRP measurement results of the primary cell and the neighboring cell, and according to the measurement report, determine the resource occupancy rate of the primary cell and the resources of each secondary cell within a preset time The occupancy rate and the resource occupancy rate of the non-CA terminal in the primary cell.

102. Determine whether the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell meet a preset condition.

Among them, the method of judging whether the preset condition is satisfied is as follows:

When the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of non-carrier aggregation terminals in the primary cell satisfy the formula , it is determined that the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-CA terminal in the primary cell meet a preset condition.

When the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of non-carrier aggregation terminals in the primary cell do not satisfy the formula , it is determined that the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-CA terminal in the primary cell do not meet the preset condition.

Wherein, the PRB_P is the resource occupancy rate of the primary cell, the PRB_Si is the resource occupancy rate of the ith secondary cell, PRB_NonCA_UE_i is the resource occupancy rate of the ith non-carrier aggregation terminal in the primary cell, and ɑ is the load scheduling coefficient, Its value can be set according to the expected situation of the network, which is used to reflect the expected value of the load of the cell. When the value of α is large, it means that the load of the main cell is expected to be heavy. When the value of α is small, it means that the load of the main cell is expected to be light. .

103. When the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell meet the preset conditions, select the non-carrier with the largest resource occupancy rate in the primary cell The aggregated terminal is handed over to the secondary cell with the smallest current resource occupancy rate.

It is supplemented that, when the preset condition is not met, load balancing may not be performed on the terminals in the current base station.

It should be noted that if it is necessary to perform load balancing for multiple non-carrier aggregation terminals at the same time, the PRB_NonCA_UE_i in the primary cell are sorted from small to large and recorded as set A,

A={A1, A2,...,An} (A1≥A2,...,≥An)

Select the terminal corresponding to the maximum value in set A in turn to switch.

It needs to be added that, when there are several secondary cells detected by non-carrier aggregation terminals in a primary cell, the resource occupancy rates of multiple neighboring cells are sorted from large to small, and recorded as set B ,

B={B1, B2,...,Bn} (wherein, B1≥B2,...,≥Bn)

The secondary cell corresponding to the minimum resource utilization value in the preferred set B is used as the target handover cell.

When it is determined that a terminal needs to perform load balancing handover, the base station needs to perform resource admission in the target handover cell, and apply for new air interface resources for the terminal after the resource admission is successful.

After the resource application is successful, the base station sends a reconfiguration RRC Connection Reconfigration message to the terminal, instructing the terminal to initiate a handover action; after the terminal accesses the target handover cell, the terminal sends a RRC ConnectionReconfigration Complete message indicating that the terminal has accessed the target cell; the base station receives the RRC ConnectionReconfigration message After the Complete message, the resources occupied by the terminal in the source cell are released.

The embodiment of the present invention provides a load balancing method, by obtaining the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of non-carrier aggregation terminals in the primary cell within a preset time, and based on These parameters determine whether to perform load balancing, which can effectively avoid network congestion and ensure communication quality.

The embodiment of the present invention also provides a device for load balancing, as shown in Figure 2, the device includes:

The acquiring unit 21 is configured to acquire the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell within a preset time.

The judging unit 22 is configured to judge whether the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell meet a preset condition.

The switching unit 23 is configured to switch the resource occupancy rate of the primary cell currently in the primary cell to The largest non-carrier aggregation terminal is handed over to the secondary cell with the smallest current resource occupancy rate.

Optionally, the judging unit 22 is specifically configured to satisfy the formula: , it is determined that the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of non-carrier aggregation terminals in the primary cell meet the preset conditions; when the resource occupancy rate of the primary cell, each secondary cell The resource occupancy rate and the resource occupancy rate of non-carrier aggregation terminals in the primary cell do not satisfy the formula , determining that the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell do not meet a preset condition;

Wherein, the PRB_P is the resource occupancy rate of the primary cell, the PRB_Si is the resource occupancy rate of the ith secondary cell, PRB_NonCA_UE_i is the resource occupancy rate of the ith non-CA terminal in the primary cell, and ɑ is the load scheduling coefficient.

Optionally, as shown in FIG. 3, the acquiring unit 21 includes:

The receiving module 211 is configured to receive the measurement report reported by the terminal, the measurement report carrying the RSRP measurement results of the primary cell and neighboring cells.

The determination module 212 is configured to determine the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell within a preset time according to the measurement report.

An embodiment of the present invention provides a device for load balancing. By obtaining the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of non-carrier aggregation terminals in the primary cell within a preset time, and based on These parameters determine whether to perform load balancing, which can effectively avoid network congestion and ensure communication quality.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be realized by means of software plus necessary general-purpose hardware, and of course also by hardware, but in many cases the former is a better embodiment . Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a readable storage medium, such as a floppy disk of a computer , a hard disk or an optical disk, etc., including several instructions for enabling a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

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 determined by the protection scope of the claims.

Claims (6)

1. A method for load balancing, comprising: Obtain the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell within a preset time; Judging whether the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell meet a preset condition; When the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of non-carrier aggregation terminals in the primary cell meet the preset conditions, the non-carrier aggregation terminal with the largest resource occupancy rate currently in the primary cell Handover to the secondary cell with the smallest resource occupancy rate; The judging whether the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell satisfies a preset condition includes: When the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of non-carrier aggregation terminals in the primary cell satisfy the formula , it is determined that the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of non-carrier aggregation terminals in the primary cell meet the preset conditions; wherein, the resource occupancy rate of the primary cell in the PRB_P , the PRB_Si is the resource occupancy rate of the i-th secondary cell, PRB_NonCA_UE_i is the resource occupancy rate of the i-th non-carrier aggregation terminal in the primary cell, ɑ is the load scheduling coefficient, and the n is the non-carrier aggregation terminal in the primary cell number. 2. The method of claim 1, wherein, When the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of non-carrier aggregation terminals in the primary cell do not satisfy the formula , it is determined that the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-CA terminal in the primary cell do not meet the preset condition. 3. The method according to claim 1, wherein the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of non-carrier aggregation terminals in the primary cell within the preset time are obtained. include: receiving a measurement report reported by a non-carrier aggregation terminal, where the measurement report carries RSRP measurement results for the primary cell and neighboring cells; According to the measurement report, determine the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell within a preset time. 4. A device for load balancing, comprising: An acquisition unit, configured to acquire the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell within a preset time; A judging unit, configured to judge whether the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell meet a preset condition; A switching unit, configured to maximize the resource occupancy rate currently in the primary cell when the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell meet a preset condition The non-carrier aggregation terminal is handed over to the secondary cell with the smallest resource occupancy rate; Wherein, the judging unit is specifically configured to meet the formula: , it is determined that the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell meet the preset conditions; wherein, the resource occupancy rate of the primary cell is the PRB_P, The PRB_Si is the resource occupancy rate of the i-th secondary cell, PRB_NonCA_UE_i is the resource occupancy rate of the i-th non-carrier aggregation terminal in the primary cell, ɑ is the load scheduling coefficient, and the n is the number of non-carrier aggregation terminals in the primary cell number. 5. The device according to claim 4, wherein the judging unit is further specifically configured to determine when the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the non-carrier aggregation terminal in the primary cell The resource usage does not satisfy the formula When it is determined that the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of the non-carrier aggregation terminal in the primary cell do not meet a preset condition. 6. The device according to claim 4, wherein the acquiring unit comprises: A receiving module, configured to receive a measurement report reported by the terminal, the measurement report carrying RSRP measurement results for the primary cell and neighboring cells; A determining module, configured to determine the resource occupancy rate of the primary cell, the resource occupancy rate of each secondary cell, and the resource occupancy rate of non-carrier aggregation terminals in the primary cell within a preset time according to the measurement report.