CN103796256B - Based on mobile status information and the mobile robustness optimization method and device of adjacent area adjacency - Google Patents

Abstract

The invention discloses a mobile robustness optimization method and device based on mobile state information and neighboring cell proximity, and belongs to the technical field of wireless communication. In this method, the micro base station controller estimates the real-time mobile state information of the mobile UE according to the periodic measurement report obtained from the mobile UE; Frequent handover between micro cells; finally, during the handover process, the handover preparation operation to the prepared target cell is advanced, and the handover conditions to avoid ping-pong handover are calculated according to the moving speed of the mobile UE and the PDCCH interruption point of the serving micro cell. Compared with the prior art, the present invention improves the prediction success rate of the prepared target cell, improves the spectrum resource utilization rate; reduces the frequent switching of the mobile UE between the macro cell and the micro cell, and further reduces the network signaling overhead; While not increasing the SToS rate, the handover success rate of the mobile UE can be improved, thereby improving user experience.

Description

Mobile robustness optimization method based on mobile state information and neighborhood proximity and its device

technical field

The invention belongs to the technical field of wireless communication, and relates to a mobile robustness optimization method and device based on mobile state information and neighboring cell proximity.

Background technique

With the wide-scale application of LTE technology, users have higher and higher requirements for data traffic. Traditional macro base stations have encountered bottlenecks in network construction and coverage. LTE-A heterogeneous small cell networks have emerged as the times require. The heterogeneous small cell network deploys low-power nodes in the coverage area of the macro base station to absorb the hotspot area of the macro network or cover its blind spot area, thus forming a heterogeneous system of different node types with the same coverage. Typical low-power nodes include pico base stations (Pico), home base stations (Femto), and relay base stations (Relay). According to the simulation results in 3GPP TR 36.814, the overall handover performance (HOF/ping-pong/SToS) under the heterogeneous network is much worse than that of the traditional pure macro cellular network, especially when the mobile UE moves fast. Among them, P2M has the largest handover failure rate HOF, mainly State 2HOF. The root cause is that the mobile UE moves too fast, so that the handover command or the PDCCH uplink authorization information received by the mobile UE from the serving picocell is due to the strong interference of the macrocell. disrupted by interference.

The TTT (Time to Trigger) timer is the duration that needs to meet the time criterion to trigger the measurement report. When the entry or exit condition of the A3 event is met and the time is reached, the corresponding measurement report can be triggered. In a high-speed scenario, since the UE moves very fast and the channel quality changes rapidly, if the TTT setting is large, it is difficult to match the channel quality of the measured cell with the channel quality after the TTT time, which may easily lead to handover failure.

In the prior art, a TTT scaling mechanism based on speed estimation MSE is proposed for handover failure caused by State 2HOF. The method adopts TTT timers of different durations to control the switching speed for mobile UEs in different moving states. The method can speed up the handover from the macro cell to the micro cell, and improve the handover success rate under the heterogeneous network. The disadvantage is that it will increase the ping-pong switching rate in low-speed scenarios and cannot avoid switching failures in high-speed scenarios. Therefore, this method has limited optimization effect on mobile robustness under heterogeneous networks.

In view of the above problems, 3GPP RAN2 proposes a handover control method that prevents high-speed mobile UE equipment from switching into a picocell. The handover failure rate between macro cells and micro cells is reduced by avoiding handover of high-speed mobile UEs to pico cells. The disadvantage of this method is that when the mobile UE urgently needs to perform a handover or even initiates the RRC connection reestablishment mechanism or the T310 early interruption mechanism, it will inevitably increase the service interruption rate of the mobile UE. In addition, when the mobile UE passes through several different Picocells continuously, since the handover process is prohibited, service interruption will be fatal.

In summary, there is a need for a mobile robustness enhancement method suitable for outbound handover of micro cells in dense heterogeneous small cell networks, so that it can allow high-speed mobile UEs to handover to picocells, and reduce the service interruption rate of mobile UEs. Improve communication service quality. At the same time, when the high-speed mobile UE is handed over from the small cell, the handover failure rate HOF is reduced without increasing the ping-pong handover rate.

In addition, as the user's demand for data traffic increases, the number of micro cells deployed in the macro cell will increase. When several micro cells are densely deployed around the serving micro cell of the mobile UE, the high-speed mobile UE is likely to frequently switch from the micro cell to the macro cell and then to the micro cell. These frequent handovers will not only bring a large amount of network signaling load, but also only a small amount of load gain will be generated for a short period of time when the mobile UE accesses the macro cell. Therefore, when a mobile UE performs cell selection in a heterogeneous network, a handover control method is needed to reduce the number of frequent handovers between macro cells and micro cells, so as to maximize the load gain of the mobile UE.

Contents of the invention

In view of this, the object of the present invention is to provide a mobile robustness optimization method and device for handover control based on user mobile information estimation, neighboring cell deployment environment and ping-pong avoidance handover conditions.

To achieve the above object, the present invention provides the following technical solutions:

A mobile robustness optimization method based on mobile state information and neighborhood proximity, comprising the following steps:

Obtain the current moving speed, moving direction and current position A of the mobile UE;

Determine the cell identity of the preliminary target cell and its proximity to the serving micro cell according to the position A and the moving direction;

Update the cell identity of the preliminary target cell of the mobile UE according to the proximity and the moving speed of the mobile UE; perform a handover preparation operation with the preliminary target cell according to the cell identity of the preliminary target cell to obtain the preliminary target Cell channel resources and reserved resource information;

Acquiring the RE offset value of the preliminary target cell;

When the preliminary target cell is a micro cell that needs to adopt RE technology, send an ABS request instruction to the macro base station controller of the macro cell covering the serving micro cell, and receive an ABS confirmation instruction, the preliminary target cell carried in the request instruction Resource information reserved for the mobile UE;

The macro base station controller receives the ABS request instruction from the serving micro cell, and the instruction carries the frequency band information that needs to be configured as an ABS;

The macro base station controller configures the corresponding ABS subframe according to the ABS request instruction;

When the configuration of the ABS subframe is completed, the macro base station controller sends an ABS confirmation instruction to the micro base station controller;

Obtaining a ping-pong avoidance handover condition for switching to the preliminary target cell according to the current moving speed of the mobile UE;

Sending a handover instruction to the mobile UE, where the handover instruction carries the cell identity of the prepared target cell, the ping-pong avoidance handover condition, and the RE offset value;

The mobile UE receives a handover instruction from the serving micro cell, and the handover instruction carries the cell identifier of the prepared target cell, the ping-pong avoidance handover condition and the RE offset value;

When the ping-pong avoidance handover condition is met, the mobile UE sends a handover instruction to the micro base station controller, where the handover instruction carries the cell identity of the target cell;

receiving a handover instruction from the UE, where the handover instruction signaling carries the cell identity of the target cell;

When the cell identities of the target cell and the preliminary target cell are the same, controlling the mobile UE to switch to the preliminary target cell;

When the cell identities of the target cell and the preliminary target cell are different, control the mobile UE to switch to the target cell, and release the reserved channel resources of the preliminary target cell.

Further, the process of obtaining the current moving speed and moving direction of the mobile UE specifically includes:

Query the measurement report record table to obtain the measurement time difference Δt of the last two measurement reports;

Query the adjacent cell information table to obtain the location information and transmit power of any three adjacent base stations a, b, and c;

Query the measurement report record table to obtain the penultimate measurement report;

According to the penultimate RSRP measurement report value, location information and transmission power of neighboring base stations a, b, c, determine the RSRP equivalent rings of the three base stations, and determine the intersection point of the three RSRP equivalent rings as the penultimate Second measurement report measurement position m;

Query the measurement report storage unit to obtain the latest measurement report;

According to the latest RSRP measurement report value, location information and transmission power of adjacent base stations a, b, c, determine the RSRP equivalent rings of the three base stations, and determine the intersection point of the three RSRP equivalent rings as the latest measurement report measurement position n;

calculating the current moving speed of the mobile UE according to Δt, m and n;

Calculate the current moving direction of the mobile UE according to m and n.

Further, obtaining the current location A of the mobile UE includes the following steps:

Query the measurement report record table to obtain the time difference between the current moment and the measurement time of the last measurement report;

Query the UE measurement status information table to obtain the measurement position, moving speed, and moving direction of the latest measurement report;

Calculate the current position A according to the time difference and the measured position, moving speed, and moving direction of the latest measurement report;

Obtaining the cell identity of the preliminary target cell and its proximity to the serving micro cell according to the position A and the moving direction, specifically includes the following steps:

Query the neighbor cell information table, and obtain the front cell identity of the front cell of the mobile UE and the distance ISD between the base station and the serving micro cell according to the position A and the moving direction;

Determining the front cell identity as the cell identity of the preliminary target cell;

Query the mapping table from ISD to proximity to obtain the proximity corresponding to the ISD.

Further, the updating the cell identity of the prepared target cell of the mobile UE according to the proximity and the moving speed of the mobile UE specifically includes:

Obtaining the proximity between the adjacent small cell that the mobile UE may move into and the serving small cell;

When the proximity is relatively far away, updating the macro cell covering the serving micro cell as the preliminary target cell of the mobile UE;

When the proximity is a short distance, query the UE measurement state information storage unit to obtain the current moving speed of the mobile UE;

When the mobile UE is in a low-speed state, updating the macro cell covering the serving micro cell as the preliminary target cell of the mobile UE;

When the mobile UE is in a high-speed state, the preliminary target cell is not updated.

The present invention also provides a micro base station controller, including:

The measurement report storage unit: used to store the measurement report record table, which records the last two periodic measurement reports and measurement time of the mobile UE. The measurement report includes the measurement ID, the RSRP value of the serving micro base station, and the neighbor base station RSRP value, when receiving a new periodic measurement report, update the measurement report record table;

UE measurement state information storage unit: used to store the UE measurement state information table, which records the moving speed, moving direction and position information of the UE during the latest periodic measurement, and calculates the moving speed, moving direction and position information according to the measurement report record table. For direction and position, update the UE measurement state information table when the measurement report record table is updated;

Obtaining unit 1: used to obtain the current moving speed and moving direction of the mobile UE;

Obtaining unit 2: for obtaining the current location A of the mobile UE;

Acquisition unit three: for acquiring the cell identity of the prepared target cell determined according to the position A and the moving direction and its proximity to the serving micro cell;

Update unit 1: for updating the cell identity of the preliminary target cell of the mobile UE according to the proximity and the moving speed of the mobile UE;

A handover preparation operation execution unit: used to perform a handover preparation operation with the preliminary target cell according to the cell identifier of the preliminary target cell, and obtain channel resources and reserved resource information of the preliminary target cell;

Handover preparation completion signaling receiving unit: used for handover preparation completion signaling, the handover preparation completion signaling carrying the reserved resource information of the preparation target cell;

Obtaining unit 4: for obtaining the RE offset value of the preliminary target cell;

ABS request command sending unit: used to send an ABS request command to the macro base station controller of the macro cell covering the serving micro cell when the preparatory target cell is a micro cell that needs to adopt RE technology, and the ABS request command includes a preparatory Resource information reserved by the target cell for the mobile UE;

ABS confirmation command receiving unit: used to receive ABS confirmation command;

Acquisition unit five: for obtaining the ping-pong avoidance handover condition for switching to the preliminary target cell;

A handover instruction sending unit: used to send a handover instruction to the mobile UE, the handover instruction carrying the cell identity of the prepared target cell and the RE offset value;

A handover instruction receiving unit: used to receive a handover instruction from the mobile UE;

A handover execution unit: configured to control the mobile UE to switch to the preliminary target cell when the cell identifiers of the target cell and the preliminary target cell are the same; At the same time, control the mobile UE to switch to the target cell, and release the reserved channel resources of the preliminary target cell.

Further, the UE measurement state information storage unit includes:

Obtaining module I: used to query the measurement report storage unit, and obtain the measurement time difference Δt of the last two measurement reports;

Query module II: used to query the neighboring cell information table, and obtain the location information and transmission power of any three neighboring base stations a, b, and c;

Obtaining module III: used to query the measurement report storage unit and obtain the penultimate measurement report;

Determination module IV: used to determine the measurement position m of the penultimate measurement report, determine the RSRP equivalent rings of the three base stations according to the RSRP report values, position information and transmission power of the adjacent base stations a, b, and c, and combine the three base stations The intersection point of a RSRP equivalence circle is determined as the measurement position m;

Obtaining module V: used to query the measurement report storage unit and obtain the latest measurement report;

Determination module VI: used to determine the measurement position n of the latest measurement report, determine the RSRP equivalent rings of the three base stations according to the RSRP report values, position information and transmission power of the adjacent base stations a, b, and c, and combine the three RSRP The intersection point of the isovalue circle is determined as the measurement position n;

Calculation module VII: calculate the current moving speed of the mobile UE according to Δt, m and n;

Calculation module VIII: calculate the current moving direction of the mobile UE according to m and n.

Further, the acquisition unit two includes:

Obtaining module I: used to query the measurement report storage unit, and obtain the time difference between the current moment and the measurement time of the last measurement report;

Query module II: used to query the UE measurement state information storage unit, and obtain the measurement position, moving speed, and moving direction of the latest measurement report;

Calculation module III: used to calculate the current position A according to the time length obtained by the acquisition module I and the measurement position, moving speed, and moving direction in the latest measurement report queried by the query module II;

The acquisition unit three includes:

Obtaining module 1: for querying the neighboring cell information table, obtaining the front cell identity of the cell in front of the mobile UE and the distance ISD between the base station and the serving micro cell;

Determining module II: used to determine the front cell identity as the cell identity of the preliminary target cell;

Obtaining module III: for querying the ISD-proximity mapping table to obtain the corresponding proximity of the ISD.

Further, the update unit one includes:

Obtaining module 1: used to inquire about the result of obtaining unit 3, and obtain the proximity between the adjacent microcell that the mobile UE may move into and the serving microcell;

Judgment module II: used to judge whether the proximity is far away, if so, go to the update module III, otherwise, go to the acquisition module IV;

Update module III: for updating the macro cell covering the serving micro cell to the preliminary target cell;

Obtaining module IV: used to query the UE measurement state information storage unit, and obtain the current moving speed of the mobile UE;

Judgment module V: used to judge whether the current speed of the mobile UE is low speed, if so, go to update module III, otherwise, do not update.

The present invention also provides a macro base station controller, including: an ABS request instruction receiving unit for receiving an ABS request instruction; an ABS configuration unit for configuring a corresponding ABS subframe according to the ABS request instruction; and an ABS acknowledgment unit for sending The ABS of the command confirms the command sending unit.

The present invention also provides a mobile UE user equipment, including: a handover command receiving unit: used to receive a handover command, the handover command carries the cell identifier of the prepared target cell, the ping-pong avoidance handover condition and the RE Offset value; handover instruction sending unit: used to send a handover instruction to the micro base station controller when the ping-pong avoidance handover condition is satisfied, and the handover instruction carries the cell identity of the target cell.

The beneficial effect of the present invention is that: compared with the prior art, the technical solution of the present invention improves the prediction success rate of the prepared target cell, improves the spectrum resource utilization rate; reduces the mobile UE between the macro cell and the micro cell. Frequent handover reduces the overhead of network signaling; while not increasing the SToS rate, it can improve the handover success rate of the mobile UE, thereby improving user experience.

Description of drawings

In order to make the purpose, technical scheme and beneficial effect of the present invention clearer, the present invention provides the following drawings for illustration:

Fig. 1 is the flowchart of mobile robustness optimization method described in the present invention;

FIG. 2 is a flowchart of a method for obtaining the current moving speed and moving direction of a mobile UE provided by the present invention;

FIG. 3 is a flowchart of a method for obtaining the current location A of a mobile UE provided by the present invention;

Fig. 4 is a flow chart of the method for obtaining the cell identity of the preliminary target cell and its proximity to the serving micro cell according to the position A and the moving direction provided by the present invention;

Fig. 5 is a flow chart of a method for updating the cell identity of the preliminary target cell of the mobile UE according to the proximity and the moving speed of the mobile UE according to the present invention;

Fig. 6 is a schematic diagram of mobile UE moving path and cell deployment in this application scenario;

Fig. 7 is a schematic diagram of determining the measurement positions of the last two measurements of the mobile UE according to the measurement report record table in this application scenario;

FIG. 8 is a schematic diagram of determining the current location of the mobile UE according to the UE measurement status information table in this application scenario;

FIG. 9 is a schematic diagram of updating the preliminary target cell according to the moving speed of the mobile UE and the proximity between the preliminary target cell and the serving micro cell in this application scenario;

FIG. 10 is a schematic diagram of a micro base station controller provided by an embodiment of the present invention;

FIG. 11 is a schematic diagram of a UE measurement state information storage unit in a micro base station controller provided by an embodiment of the present invention;

FIG. 12 is a schematic diagram of an acquisition unit 2 in the micro base station controller provided by an embodiment of the present invention;

FIG. 13 is a schematic diagram of an acquisition unit 3 in the micro base station controller provided by an embodiment of the present invention;

Fig. 14 is a schematic diagram of update unit 1 in the micro base station controller provided by the embodiment of the present invention;

FIG. 15 is a schematic diagram of a macro base station controller provided by an embodiment of the present invention;

Fig. 16 is a schematic diagram of a mobile UE user equipment provided by an embodiment of the present invention.

detailed description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 , FIG. 1 is a flowchart of a mobile robustness optimization method provided by an embodiment of the present invention. In this embodiment, the mobile robustness optimization process performed by the Femtocell controller may specifically include:

Step A1. Obtain the current moving speed and moving direction of the mobile UE.

Specifically, the femto base station controller may query the UE measurement state information table to obtain the current moving speed and moving direction of the mobile UE. In the example of the present invention, the change of the moving state of the mobile UE within the measurement report period is ignored, and the current moving speed and moving direction of the mobile UE are calculated according to the measurement position and time information of the last two measurement reports.

Step A2. Obtain the current location A of the mobile UE.

Specifically, the femto base station controller may query the UE measurement status information table to obtain the measurement position, moving speed, and moving direction at the moment of the latest measurement report. The current location A of the mobile UE is then calculated according to the measurement time difference between the current moment and the latest measurement report.

Step A3. Determine the cell identity of the preliminary target cell and its proximity to the serving micro cell according to the position A and the moving direction.

Specifically, the micro base station controller may determine the cell identity of the prepared target cell and its proximity to the serving micro cell according to the current location A and the current moving direction. In the embodiment of the present invention, the cell identity of the cell in front of the mobile UE determined by the position A and the moving direction is determined as the cell identity of the preliminary target cell. Furthermore, according to the neighbor cell information table, the distance ISD between the base station of the front cell and the serving micro cell is obtained, and the mapping table from ISD to proximity is queried to obtain the proximity corresponding to the ISD.

Step A4, updating the cell identity of the preliminary target cell of the mobile UE according to the proximity and the moving speed of the mobile UE.

Specifically, after obtaining the proximity, the Femtocell controller may judge whether the proximity is relatively far away, and if so, update the macro cell covering the serving micro cell as a preliminary target cell. If not, acquire the moving speed of the mobile UE. It is judged whether the moving speed is low, and if so, updating the macro cell covering the serving micro cell as a backup target cell. If not, the preliminary target cell is not updated.

Step A5: Perform a handover preparation operation with the preliminary target cell according to the cell identifier of the preliminary target cell, and obtain channel resources and reserved resource information of the preliminary target cell.

Specifically, the Femtocell controller may perform a handover preparation operation with the preliminary target cell according to the cell identifier of the preliminary target cell, obtain channel resources of the preliminary target cell, establish a wireless channel, and complete the handover preparation operation. Finally, acquire resource information of the reserved channel;

Step A6, acquiring the RE offset value of the preliminary target cell.

Specifically, the micro base station controller may query the RE offset value table, and obtain the corresponding RE offset value according to the cell type of the prepared target cell and the inter-site distance (ISD, Inter Site Distance) from the serving micro cell. If the prepared target cell is a macro cell, the RE technology does not need to be used, that is, the RE offset value=0dB. If the preparatory target cell is the front micro cell, when the front micro cell overlaps or is tangent to the serving micro cell, set the RE offset value = 0dB, and when the front micro cell and the serving micro cell are separated by a certain distance, determine non-zero according to ISD RE bias value.

Wherein the exemplary structure of the RE offset value table is shown in Table 1:

Table 1. RE Bias Value Table

Preparing the target cell type ISD(m) RE-offset(dB) macrocell (-∞, +∞) 0 picocell ... ...

Step A7. When the preparatory target cell is a micro cell requiring RE technology, send an ABS request command to the macro base station controller of the macro cell covering the serving micro cell, and receive an ABS confirmation command. The resource information that the preparatory target cell carries in the request instruction is reserved for the mobile UE.

Specifically, the micro base station controller may send an ABS request instruction to the macro base station controller covering the macro cell of the serving micro cell when the prepared target cell is a micro cell requiring RE technology, and receive an ABS confirmation instruction. The preparatory target cell carried in the request instruction is resource information reserved for the mobile UE, so that the macro base station controller configures the corresponding frequency band of the macro cell as an ABS subframe according to the reserved resource information.

Step A8, the macro base station controller receives the ABS request instruction from the serving micro cell, and the instruction carries the frequency band information that needs to be configured as an ABS.

Specifically, the macro base station controller receives an ABS request instruction from the micro base station controller serving the micro cell, and the instruction carries frequency band information that needs to be configured as an ABS.

Step A9, the macro base station controller configures the corresponding ABS subframe according to the ABS request instruction.

Specifically, the macro base station controller may configure the corresponding frequency band of the macro cell as the ABS subframe according to the resource information reserved for the mobile UE by the prepared target cell carried in the ABS request instruction.

Step A10, when the configuration of the ABS subframe is completed, the macro base station controller sends an ABS confirmation instruction to the micro base station controller.

Specifically, when the macro base station controller completes the configuration of the ABS subframe, it sends an ABS confirmation instruction to the micro base station controller serving the micro cell.

Step A11 , acquiring the ping-pong avoidance handover condition for handover to the preliminary target cell according to the current moving speed of the mobile UE.

Specifically, the micro base station controller serving the micro cell may query the ping-pong avoidance handover parameter table according to the current moving speed of the mobile UE, and obtain the ping-pong avoidance handover condition for switching to the preliminary target cell. The example of the present invention refers to the simulation result of the hot area scene in 3GPP TR36.839, and determines the switching condition with the ping-pong switching rate lower than 10% as the ping-pong avoiding switching condition.

Wherein the exemplary structure of the ping-pong avoidance switching parameter table is shown in Table 1:

Table 2. Table of parameters for ping-pong avoidance switching

Moving speed v(Km/h) mobile state Switch execution condition offset(TTT=0ms) (0,30) low speed 2.5dB (30,120) medium speed 2.5dB (120,+∞) high speed 2dB

Step A12 , sending a handover instruction to the mobile UE, the handover instruction carrying the cell identity of the prepared target cell, the ping-pong avoidance handover condition and the RE offset value.

Specifically, the micro base station controller may send a handover instruction to the mobile UE, where the handover instruction carries the cell identifier of the prepared target cell, the ping-pong avoidance handover condition, and the RE offset value. so that the mobile UE reconfigures the handover parameters of the preliminary target cell according to the cell identity of the preliminary target cell carried in the handover instruction;

Step A13, the mobile UE receives a handover instruction from the serving micro cell, and the handover instruction carries the cell identity of the preliminary target cell, the ping-pong avoidance handover condition and the RE offset value.

Specifically, the mobile UE may receive a handover instruction from the serving micro cell, where the handover instruction carries the cell identifier of the prepared target cell, the ping-pong avoidance handover condition, and the RE offset value. and reconfiguring the handover parameters of the preliminary target cell according to the cell identity of the preliminary target cell, the ping-pong avoidance handover condition and the RE offset value;

Step A14, when the ping-pong avoidance handover condition is satisfied, the mobile UE sends a handover instruction to the Femtocell controller, and the handover instruction carries the cell identity of the target cell.

Specifically, the mobile UE may send a handover instruction to the Femtocell controller when the ping-pong avoidance condition is present, and the handover instruction carries the cell identifier of the target cell. so that the micro base station controller performs handover control operations according to the cell identity of the target cell;

Step A15, receiving a handover instruction from the UE, the handover instruction signaling carrying the cell identity of the target cell.

Specifically, the base station controller may receive a handover instruction from the mobile UE, where the handover instruction signaling carries the cell identifier of the target cell.

Step A16, when the cell identifiers of the target cell and the preliminary target cell are the same, control the mobile UE to handover to the preliminary target cell.

Specifically, the base station controller may control the mobile UE to handover to the preliminary target cell when the cell identifiers of the target cell and the preliminary target cell are the same.

Step A17. When the cell identities of the target cell and the preliminary target cell are different, control the mobile UE to switch to the target cell, and release the reserved channel resources of the preliminary target cell.

Specifically, the base station controller may control the mobile UE to switch to the target cell and release the reserved channel resources of the preliminary target cell when the cell identities of the target cell and the preliminary target cell are different.

In addition, in the embodiment of the present invention, after step A6 is executed, if the obtained RE offset value is non-zero, that is, the prepared target cell needs to adopt RE technology, then continue to execute steps A7-A17. If the acquired RE offset value is zero, that is, the prepared target cell does not need to adopt RE technology, then directly skip to step A11 and continue to execute steps A11-A17.

In the embodiment of the present invention, the micro base station controller judges whether it is possible to control the mobile UE to directly switch to the front adjacent micro cell according to the proximity of the mobile UE's front adjacent micro cell and the serving micro cell to prevent the mobile UE from being in the macro cell and the micro cell. Frequent switching between zones. Compared with the reference measurement parameters used in the prior art when performing handover measurement, the embodiment of the present invention enables the adjacent front micro cell to use the RE technology to increase the probability of the mobile UE switching into the front micro cell, reducing the mobile UE's The SToS rate in the macro cell alleviates the frequent switching of the mobile UE between the macro cell and the micro cell, thereby reducing network signaling overhead.

Meanwhile, in the embodiment of the present invention, the micro base station controller advances the handover preparation operation to the standby target cell, and calculates the handover condition to avoid ping-pong handover according to the moving speed of the mobile UE and the PDCCH interruption point of the serving micro cell. Compared with the TTT (Time To Trigger) timer scaling mechanism based on moving speed estimation in the prior art, the embodiment of the present invention is more reasonable in decision-making of handover conditions, and improves the handover of mobile UEs without increasing the SToS rate. success rate and improve user experience.

Referring to FIG. 2 , FIG. 2 is a flow chart of a method for acquiring the current moving speed and moving direction of the mobile UE according to an embodiment of the present invention. In the embodiment of the present invention, the step of obtaining the current moving speed and moving direction of the mobile UE by the Femtocell base station controller (step A1) may include:

Step B1, query the measurement report record table, and obtain the measurement time difference Δt of the last two measurement reports.

Specifically, the femto base station controller may query the measurement report recording table to obtain the measurement time difference Δt between the latest two measurement reports. Wherein, the measurement report record table is an information table in the measurement report storage unit in the Femtocell, which records the last two periodic measurement reports and measurement time of the mobile UE, and the measurement report includes measurement ID, service Small base station RSRP value, neighbor base station RSRP value. When a new periodic measurement report is received, the measurement report recording table is updated.

Step B2. Query the neighboring cell information table to obtain the location information and transmit power of any three neighboring base stations a, b, c.

Specifically, the micro base station controller can query the neighboring cell information table to obtain the location information and transmit power of any three neighboring base stations a, b, and c. Wherein, the location information of any three neighboring base stations a, b, and c may be relative to the location information of the base station, that is, location information in a coordinate system established with the location of the base station as the (0,0) coordinate origin.

Step B3, query the measurement report record table, and obtain the penultimate measurement report.

Specifically, the femto base station controller may query the measurement report recording table to obtain the penultimate measurement report. Wherein, the penultimate measurement report refers to the penultimate measurement report reported by the mobile UE calculated from the current time to the historical time. Since only two measurement reports are recorded in the measurement report recording table at most, the measurement time of the penultimate measurement report in the measurement report recording table is the earliest.

Step B4: Determine the RSRP equivalent rings of the three base stations according to the penultimate RSRP measurement report values, location information and transmit power of the adjacent base stations a, b, and c. The intersection point of the three RSRP equivalent circles is determined as the penultimate measurement report measurement position m.

Specifically, the micro base station controller may determine the RSRP equivalent rings of the three base stations according to the penultimate RSRP measurement report values, location information, and transmit power of neighboring base stations a, b, and c. The intersection point of the three RSRP equivalent circles is determined as the penultimate measurement report measurement position m. Wherein, the RSRP equivalent ring is obtained by superimposing a path loss model on a lossless transmit power model centered on the base station and radiating outward. Under this model, the equivalent area where the RSRP is measured in the cell is a circle. The center of the circle is the position of the measured base station corresponding to the measured value, and the radius is the distance between the measurement point, that is, the position of the UE, and the base station. Each RSRP report value corresponds to an RSRP equivalence cycle. Therefore, three corresponding RSRP equivalence rings 1, 2, and 3 are determined by using the RSRP values of the three base stations measured at the measurement points, and the intersection of the rings 1, 2, and 3 can be determined as the RSRP measurement point, that is, the position of the UE.

Step B5, querying the measurement report storage unit to obtain the latest measurement report.

Specifically, the femto base station controller can query the measurement report record table to obtain the latest measurement report. The measurement time of the latest measurement report in the measurement report recording table is the latest.

Step B6, according to the latest RSRP measurement report value, location information and transmission power of neighboring base stations a, b, c, determine the RSRP equivalent rings of the three base stations. The intersection point of the three RSRP equivalent circles is determined as the latest measurement report measurement position n.

Specifically, the micro base station controller may determine the RSRP equivalent rings of the three base stations according to the latest RSRP measurement report values, location information and transmit power of neighboring base stations a, b, and c. The intersection point of the three RSRP equivalent circles is determined as the latest measurement report measurement position n.

Step B7. Calculate the current moving speed of the mobile UE according to Δt, m and n.

Specifically, the femto base station controller may calculate the current moving speed of the mobile UE according to Δt, m and n. The calculation formula is:

Wherein, (m _x , m _y ) is the coordinate of point m relative to the base station, and (n _x , _ny ) is the coordinate of point n relative to the base station.

Step B8, calculating the current moving direction of the mobile UE according to m and n.

Specifically, the femto base station controller may calculate the current moving direction of the mobile UE according to m and n.

In the embodiment of the present invention, after calculating the current moving speed of the mobile UE according to Δt, m and n, the above embodiment of the handover control method further includes:

After calculating the current moving speed and moving direction of the mobile UE, the micro base station controller updates the UE measurement state information storage according to the calculated moving speed, moving direction, position n and the measurement time of the latest measurement report in the measurement report record table UE measurement state information table in the cell.

When receiving the periodic measurement report from the mobile UE, the femto base station controller updates the measurement report record table of the measurement report storage unit according to the content of the measurement report and the measurement time of the measurement report.

In the embodiment of the present invention, the micro base station controller obtains the periodic measurement report from the mobile UE, updates the measurement report record table in time, and calculates the mobile state information of the mobile UE at the latest measurement according to the updated measurement report record table . Compared with other mobile state estimation methods, the moving speed, moving direction and location information obtained by the embodiment of the present invention are more accurate, which further improves the prediction success rate of the prepared target cell, reduces unnecessary handover preparation operations, and improves the frequency spectrum. resource utilization.

Referring to FIG. 3 , FIG. 3 is a flowchart of a method for obtaining the current location A of the mobile UE provided by an embodiment of the present invention. In the embodiment of the present invention, the step of obtaining the current location A of the mobile UE (step A2) may also include:

Step C1. Query the measurement report record table to obtain the time difference between the current moment and the measurement time of the last measurement report.

Specifically, the femto base station controller may query the measurement report record table to obtain the measurement time of the last measurement report, and then calculate the time difference between the current time and the measurement time of the last measurement report according to the current time.

Step C2, query the UE measurement state information table, and obtain the measurement position, moving speed, and moving direction of the latest measurement report.

Specifically, the femto base station controller can query the UE measurement status information table to obtain the measurement location, moving speed, and moving direction of the latest measurement report.

Step C3, calculating and obtaining the current position A according to the time difference and the measured position, moving speed, and moving direction of the latest measurement report.

Specifically, the Femtocell controller may calculate the current position A according to the time difference and the measured position, moving speed, and moving direction of the latest measurement report.

In this embodiment, since the periodic measurement period is very short, the moving path of the UE from the measurement time of the latest measurement report to the current time may be approximated as a straight line. Therefore, the measurement position of the latest measurement report can be directly used as the starting point of the straight line path, and then the end point of the straight line path, that is, the current position A of the mobile UE, can be determined according to the moving speed, direction and time difference. The position calculation method can improve the prediction success rate of the preparatory target cell.

Referring to FIG. 4 , FIG. 4 is a flow chart of a method for obtaining the cell identity of the preliminary target cell and its proximity to the serving micro cell according to the position A and the moving direction provided by this embodiment. In the embodiment of the present invention, the step of obtaining the cell identity of the preliminary target cell and its proximity to the serving microcell according to the position A and the moving direction (step A3) may further include:

Step D1, query the neighboring cell information table, and obtain the front cell ID of the front cell of the mobile UE and the distance ISD from the base station of the serving micro cell according to the position A and the moving direction.

Specifically, the micro base station controller may query the neighboring cell information table, and obtain the front cell ID of the front cell of the mobile UE and the distance ISD from the base station of the serving micro cell according to the position A and the moving direction.

Step D2, determining the front cell identity as the cell identity of the preliminary target cell.

Specifically, the femto base station controller may determine the front cell identity as the cell identity of the preliminary target cell.

Step D3, query the mapping table of ISD to proximity, and obtain the proximity corresponding to the ISD.

Specifically, the femto base station controller may query the mapping table from the ISD to the proximity to obtain the proximity corresponding to the ISD. Wherein, the mapping table is a mapping between the inter-site distance (ISD, Inter Site Distance) and the proximity, that is, the proximity type corresponding to the ISD is stored in the mapping table. Proximity types include "closer" and "farther away".

Referring to FIG. 5 , FIG. 5 is a flowchart of a method for updating a cell identity of a preliminary target cell of the mobile UE according to the proximity and the moving speed of the mobile UE according to an embodiment of the present invention. In the embodiment of the present invention, the step of updating the cell identity of the preliminary target cell of the mobile UE according to the proximity and the moving speed of the mobile UE (step A4) may further include:

Step E1 , obtaining the proximity between the adjacent micro cell that the mobile UE may move into and the serving micro cell.

Specifically, the femto base station controller may acquire the proximity between the adjacent micro cell that the mobile UE may move into and the serving micro cell according to step D3.

Step E2, when the proximity is relatively far away, updating the macro cell covering the serving micro cell as the preliminary target cell of the mobile UE.

Specifically, the micro base station controller may update the macro cell covering the serving micro cell as the preliminary target cell of the mobile UE when the proximity is relatively far away. Wherein, the longer distance refers to when the inter-cell interference brought by the range extension RE cannot make up for the load benefit brought by it.

Step E3. When the proximity is short, query the UE measurement state information storage unit to obtain the current moving speed of the mobile UE.

Specifically, the Femtocell controller may query the UE measurement state information storage unit to obtain the current moving speed of the mobile UE when the proximity is relatively short.

Step E4. When the mobile UE is in a low-speed state, update the macro cell covering the serving micro cell as the preliminary target cell of the mobile UE.

Specifically, the micro base station controller may update the macro cell covering the serving micro cell as the preliminary target cell of the mobile UE when the mobile UE is in a low-speed state

Step E5. When the mobile UE is in a high-speed state, do not update the preliminary target cell.

In the embodiment of the present invention, the micro base station controller applies the RE technology to a micro cell with a short distance ahead as a preliminary target cell for a high-speed mobile UE. Compared with the reference measurement parameters used in the prior art when performing handover measurement, the embodiment of the present invention enables the adjacent front micro cell to use the RE technology to increase the probability of the mobile UE switching into the front micro cell and reduce the The SToS rate in the cell reduces the frequent switching of the mobile UE between the macro cell and the micro cell, thereby reducing network signaling overhead.

For a more detailed understanding of the embodiments of the present invention, specific application scenarios of the present invention are given below.

Referring to FIG. 6, FIG. 6 is a schematic diagram of a moving path of a mobile UE and cell deployment in this application scenario. Among them, the MeNB is a macro base station, and within the coverage area of the macro cell, 9 micro cell picocells are randomly deployed, namely the micro cells #1 to #7. The serving microcell of the mobile UE is #1, and moves along the path indicated by the arrow. According to the trend of this route, if the distance between microcell #2 and #1 is relatively close, the handover target cell of the mobile UE is likely to be microcell #2. If the distance between the micro cell #2 and #1 is far, the handover target cell of the mobile UE is likely to be the macro cell covering #1.

Referring to FIG. 7, FIG. 7 is a schematic diagram of determining the measurement positions of the last two measurements of the mobile UE according to the measurement report record table in this application scenario. Wherein, a coordinate system is established with the base station of serving microcell #1 as the origin, and the coordinates of microcells #2, #3, and #4 are (x2, y2), (x3, y3), (x4, y4) respectively. Assume that the measurement position of the mobile UE when measuring the penultimate measurement is point m, and the measurement position when measuring the latest measurement is point n. The following details how to calculate the coordinates of point m:

1) Query the RSRP values of adjacent microcells #2, #3, and #4 in the penultimate measurement report, which are RSRP1, RSRP2, and RSRP3 respectively;

2) Query the reference signal transmission power RSTP values of adjacent micro cells #2, #3, and #4, which are RSTP2, RSTP3, and RSTP4 respectively;

3) According to the formula RSRP2=RSTP2-PL(R1), the radius R ₂ of the RSRP equivalent circle 1 is calculated. Among them, PL(R ₂ ) is the path loss model, which can be obtained according to 3GPP TR36.814. The path loss model of picocell is PL=140.7+36.7log ₁₀ R, and the unit of R is Km;

4) Similarly, calculate the radius R ₃ of the RSRP equivalent ring 2 and the radius R ₄ of the RSRP equivalent ring 3;

5) Establish a system of equations Solve the coordinates of point m (m _x , m _y );

After the coordinates of point m (m _x , m _y ) are calculated, the coordinates of point n (n _x , _ny ) are calculated by the same method. Query the measurement report record table to obtain the measurement time difference of the last two measurement reports as Δt, then we can get:

Moving speed:

Direction of movement: where k is the slope;

Referring to FIG. 8, FIG. 8 is a schematic diagram of determining the current location of the mobile UE according to the UE measurement state information table in this application scenario. Wherein, point n is the measurement position of the mobile UE in the latest measurement. Query the UE measurement state information table to obtain the latest measurement position of the mobile UE as (n _x , _ny ), the moving speed equal to v, the slope of the moving direction as k, the measurement time as t1, and the current moment as t2. Then the position (a _x , a _y ) of point A can be obtained as

Referring to FIG. 9 , FIG. 9 is a schematic diagram of updating the preliminary target cell according to the moving speed of the mobile UE and the proximity between the preliminary target cell and the serving micro cell in this application scenario. Wherein, #2 is the front adjacent micro cell of the mobile UE, that is, the current preliminary target cell. In Figure (1), the distance between the micro cell #2 and #1 is relatively long, and the macro cell serving as the coverage service of cell #1 is updated as a preliminary target cell. In Figure (2), the distance between the micro cell #2 and #1 is relatively short, but the moving state of the UE is at a low speed, and the macro cell serving as the coverage service of cell #1 is also updated as the backup target cell. In the figure (2), the distance between the micro cell #2 and #1 is relatively short, but the UE's moving state is not low, so the preliminary target cell is not updated.

The embodiment of the present invention also provides a corresponding embodiment of the micro base station controller, referring to FIG. 10 , which is a schematic diagram of the micro base station controller provided by the embodiment of the present invention.

In this embodiment, the micro base station controller includes:

The measurement report storage unit 1010 is used to store the measurement report record table, which records the last two periodic measurement reports and measurement time of the mobile UE, and the measurement report includes the measurement ID, the RSRP value of the serving micro base station, the neighbor Base station RSRP value. When a new periodic measurement report is received, update the measurement report recording table;

The UE measurement state information storage unit 1020 is configured to store a UE measurement state information table, which records the moving speed, moving direction and location information of the UE at the latest periodic measurement. The moving speed, moving direction and position are calculated according to the measurement report record table. When the measurement report record table is updated, update the UE measurement state information table;

An obtaining unit 1030, configured to obtain the current moving speed and moving direction of the mobile UE;

Obtaining unit two 1040, configured to obtain the current location A of the mobile UE;

Acquisition unit 3 1050, configured to acquire the cell identity of the preliminary target cell determined according to the position A and the moving direction and its proximity to the serving micro cell;

An updating unit 1060, configured to update the cell identity of the preliminary target cell of the mobile UE according to the proximity and the moving speed of the mobile UE;

The handover preparation operation execution unit 1070 is configured to perform a handover preparation operation with the preliminary target cell according to the cell identifier of the preliminary target cell, and obtain channel resources and reserved resource information of the preliminary target cell;

The handover preparation completion signaling receiving unit 1080 is used for the handover preparation completion signaling, the handover preparation completion signaling carrying the reserved resource information of the preliminary target cell;

Acquisition unit 4 1090, configured to acquire the RE offset value of the prepared target cell;

The ABS request instruction sending unit 1100 is configured to send an ABS request instruction to the macro base station controller of the macro cell covering the serving micro cell when the preparatory target cell is a micro cell requiring RE technology. The ABS request instruction includes resource information reserved by the prepared target cell for the mobile UE;

An ABS confirmation instruction receiving unit 1110, configured to receive an ABS confirmation instruction;

Obtaining unit five 1120, configured to obtain the ping-pong avoidance handover condition for switching to the preliminary target cell;

A handover instruction sending unit 1130, configured to send a handover instruction to the mobile UE. The handover instruction carries the cell identity of the preliminary target cell and the RE offset value;

A handover instruction receiving unit 1140, configured to receive a handover instruction from the mobile UE;

A handover execution unit 1150, configured to control the mobile UE to handover to the preliminary target cell when the cell identifiers of the target cell and the preliminary target cell are the same; When the identifiers are different, control the mobile UE to switch to the target cell, and release the reserved channel resources of the preliminary target cell;

The embodiment of the micro base station controller provided in this embodiment can be applied to the foregoing mobile robustness optimization method.

Referring to FIG. 11 , FIG. 11 is a schematic diagram of a UE measurement state information storage unit in a micro base station controller provided by an embodiment of the present invention. In the embodiment of the present invention, the UE measurement state information storage unit includes:

The acquisition module I1021 is used to query the measurement report storage unit and obtain the measurement time difference Δt of the last two measurement reports;

The query module II1022 is used to query the neighboring cell information table, and obtain the position information and transmission power of any two neighboring base stations a and b;

Obtaining module III1023, used to query the measurement report storage unit, and obtain the penultimate measurement report;

The determination module IV1024 is used to determine the measurement position m of the penultimate measurement report. According to the RSRP report value, location information and transmission power of neighboring base stations a, b and the serving micro base station, the RSRP equivalent rings of the three base stations are determined. Determining the intersection point of the three RSRP equivalence circles as the measurement position m;

The acquisition module V1025 is used to query the measurement report storage unit and obtain the latest measurement report;

The determination module VI1026 is used to determine the measurement position n in the latest measurement report. According to the RSRP report value, location information and transmission power of neighboring base stations a, b and the serving micro base station, the RSRP equivalent rings of the three base stations are determined. Determining the intersection point of the three RSRP equivalent rings as the measurement position n;

A calculation module VII1027, configured to calculate the current moving speed of the mobile UE according to Δt, m and n;

A calculation module VIII1028, configured to calculate the current moving direction of the mobile UE according to m and n;

Referring to FIG. 12 , FIG. 12 is a schematic diagram of an acquisition unit 2 in a micro base station controller provided by an embodiment of the present invention. In the embodiment of the present invention, the acquisition unit 2 includes:

The acquisition module I1041 is used to query the measurement report storage unit and obtain the time difference between the current moment and the measurement time of the last measurement report;

The query module II1042 is used to query the UE measurement state information storage unit to obtain the measurement position, moving speed, and moving direction of the latest measurement report;

The calculation module III1043 is used to calculate the current position A according to the time length obtained by the acquisition module I and the measurement position, moving speed and moving direction in the latest measurement report queried by the query module II;

Referring to FIG. 13 , FIG. 13 is a schematic diagram of an acquisition unit 3 in a micro base station controller provided by an embodiment of the present invention. In the embodiment of the present invention, the acquisition unit three includes:

The obtaining module I1051 is used to query the neighboring cell information table, obtain the front cell identity of the mobile UE front cell and the distance ISD between the base station and the serving micro cell;

A determination module II1052, configured to determine the front cell identity as the cell identity of the preliminary target cell;

The obtaining module III1053 is used to query the ISD-proximity mapping table, and obtain the corresponding proximity of the ISD;

Referring to FIG. 14 , FIG. 14 is a schematic diagram of an updating unit 1 in a micro base station controller provided by an embodiment of the present invention. In the embodiment of the present invention, update unit one includes:

The acquisition module I1061 is used to query the result of the acquisition unit 3, and acquire the proximity between the adjacent micro cell that the mobile UE may move into and the serving micro cell;

Judgment module II1062, configured to judge whether the proximity is relatively far away. If yes, go to update module III. Otherwise, go to get module IV;

An updating module III1063, configured to update the macro cell covering the serving micro cell as the preliminary target cell;

An acquisition module IV1064, configured to query the UE measurement state information storage unit, and acquire the current moving speed of the mobile UE;

A judging module V1065, configured to judge whether the current speed of the mobile UE is low. If so, go to update module III. Otherwise, do not update;

Referring to FIG. 15 , FIG. 15 is a schematic diagram of a macro base station controller provided by an embodiment of the present invention. In the embodiment of the present invention, the macro base station controller includes:

The ABS request instruction receiving unit 2010 is used to receive the ABS request instruction;

The ABS configuration unit 2020 is configured to configure the corresponding ABS subframe according to the ABS request instruction;

An ABS confirmation instruction sending unit 2030, configured to send an ABS confirmation instruction;

The embodiment of the macro base station controller provided by the embodiment of the present invention can be applied to the foregoing mobile robustness optimization method.

Referring to FIG. 16 , FIG. 16 is a schematic diagram of a mobile UE user equipment provided by an embodiment of the present invention. In the embodiment of the present invention, the mobile UE user equipment includes:

A handover instruction receiving unit 3010, configured to receive a handover instruction, where the handover instruction carries the cell identifier of the preliminary target cell, the ping-pong avoidance handover condition, and the RE offset value;

A handover instruction sending unit 3020, configured to send a handover instruction to the micro base station controller when the ping-pong avoidance handover condition is satisfied, the handover instruction carrying the cell identifier of the target cell;

The mobile UE user equipment embodiments provided by the embodiments of the present invention can be applied to the foregoing mobile robustness optimization method.

Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in terms of form and Various changes may be made in the details without departing from the scope of the invention defined by the claims.

Claims (8)

1. based on mobile status information and the mobile robustness optimization method of adjacent area adjacency, it is characterised in that：Including following step Suddenly：

Obtain the current translational speeds of mobile UE, moving direction and current position A；

According to position A and moving direction determine alternative target cell cell ID and its with service Microcell adjacency；

The cell mark of the alternative target cell of the mobile UE is updated according to the adjacency with the translational speed of the mobile UE Know；

According to the cell ID of the alternative target cell, preparation operation is switched over alternative target cell, obtained described pre- The channel resource of standby Target cell and reserved resource information；

Obtain the RE biases of the alternative target cell；

When the alternative target cell is to need the Microcell using RE technology, to the grand of the macrocell for covering service Microcell Base station controller sends ABS request instructions, and receives ABS confirmation instructions, the alternative target cell carried in the request instruction For the reserved resource informations of the mobile UE；

Macro base station controller receives the ABS request instructions from service Microcell, and carrying in the instruction needs to be configured to ABS's Band information；

Macro base station controller configures corresponding A BS subframe according to the ABS request instructions；

When the configuration of ABS subframes is completed, macro base station controller sends ABS to micro-base station controller and confirms instruction；

The table tennis that current translational speed acquisition according to the mobile UE is switched to the alternative target cell avoids switching condition；

Switching command is sent to the mobile UE, cell ID, the institute of the alternative target cell in the switching command, is carried State table tennis and avoid switching condition and the RE biases；

The mobile UE receives the switching command from service Microcell, carries the alternative target cell in the switching command Cell ID, the table tennis avoid switching condition and the RE biases；

When the table tennis avoids switching condition from meeting, the mobile UE sends switching to micro-base station controller and indicates, switching refers to Show the middle cell ID for carrying Target cell；

The switching instruction from the UE is received, the cell ID of Target cell in the switching indication signaling, is carried；

When the Target cell is identical with the cell ID of the alternative target cell, the control mobile UE is switched to described Alternative target cell；

When the Target cell is different with the cell ID of the alternative target cell, the control mobile UE is switched to described Target cell, discharges the channel reservation resource of the alternative target cell.

2. according to claim 1 based on mobile status information and the mobile robustness optimization method of adjacent area adjacency, its It is characterised by：The process for obtaining the current translational speeds of the mobile UE and moving direction is specifically included：

Inquiry measurement report record sheet, obtains recently the time of measuring difference Δ t of measurement report twice；

Inquiry neighboring BS information table, obtains any three adjacent base stations a, the positional information and transmission power of b, c；

Inquiry measurement report record sheet, obtains second from the bottom measurement report；

According to adjacent base station a, second from the bottom RSRP measurement report values, positional information and the transmission power of b, c, three base stations are determined RSRP equivalence ring, by three RSRP equivalence ring intersection point be defined as second from the bottom measurement report measurement position m；

Inquiry measurement report memory cell, obtains the last measurement report；

According to adjacent base station a, the last RSRP measurement report values of b, c, positional information and transmission power, three base stations are determined The intersection point of three RSRP equivalence rings is defined as the last measurement report measurement position n by RSRP equivalence rings；

The current translational speeds of the mobile UE are calculated according to Δ t, m and n；

The current moving directions of the mobile UE are calculated according to m and n.

3. according to claim 1 based on mobile status information and the mobile robustness optimization method of adjacent area adjacency, its It is characterised by：Obtain the current position A of the mobile UE to comprise the following steps：

Inquiry measurement report record sheet, obtains the time difference at current time and last time measurement report time of measuring；

Inquiry UE measuring state information tables, the measurement position of the last measurement report of acquisition, translational speed, moving direction；

Measurement position, translational speed according to the time difference and the last measurement report, moving direction are calculated currently Position A；

The cell ID of alternative target cell and its neighbouring with service Microcell is obtained according to position A and the moving direction Degree,

Specifically include following steps：

Inquiry neighboring BS information table is little according to the front that the position A and the moving direction obtain cell in front of the mobile UE Area's mark and its base distance between sites ISD with service Microcell；

The cell ID that front cell ID is defined as alternative target cell；

Mapping tables of the inquiry ISD to adjacency, obtains the corresponding adjacencies of the ISD.

4. according to claim 1 based on mobile status information and the mobile robustness optimization method of adjacent area adjacency, its It is characterised by：The cell mark of the alternative target cell according to adjacency mobile UE described with the translational speed renewal of mobile UE Know, specifically include：

Obtain the mobile the UE adjacent Microcell that may be moved into and the adjacency for servicing Microcell；

When adjacency is distant, the alternative target that the macrocell for covering service Microcell is updated to the mobile UE is little Area；

When adjacency is closer to the distance, UE measuring state information memory cells are inquired about, obtain the current movements of the mobile UE Speed；

When the mobile UE is lower-speed state, the alternative target for being updated to move UE by the macrocell for covering service Microcell is little Area；

When the mobile UE is fast state, alternative target cell is not updated.

5. a kind of micro-base station controller, it is characterised in that：Including：

Measurement report memory cell：For storing measurement report record sheet, the mobile UE for recording in table twice recently is periodic Measurement report and time of measuring, the measurement report include measuring ID, service micro-base station RSRP value, adjacent base station RSRP value, When receiving new periodic measurement report, the measurement report record sheet is updated；

UE measuring state information memory cells：For storing UE measuring state information tables, in table, record UE is in the last cycle Property measurement when translational speed, moving direction and positional information, according to measurement report record sheet be calculated the translational speed, Moving direction and position, when the measurement report record sheet updates, update the UE measuring states information table；

Acquiring unit one：For obtaining the current translational speeds of the mobile UE and moving direction；

Acquiring unit two：The position A current for obtaining the mobile UE；

Acquiring unit three：For obtaining the cell ID for determining alternative target cell according to the position A and the moving direction And its adjacency with service Microcell；

Updating block one：For updating the preparation mesh of the mobile UE according to the adjacency and the translational speed of the mobile UE The cell ID of mark cell；

Switching prepares operation execution unit：For the cell ID according to the alternative target cell, enter with alternative target cell Row switching prepares operation, obtains the channel resource of the alternative target cell and reserved resource information；

Switching is ready to complete signaling receiving unit：Signaling is ready to complete for switching, the switching is ready to complete in signaling and carries The reserved resource information of the alternative target cell；

Acquiring unit four：For obtaining the RE biases of the alternative target cell；

ABS request instruction transmitting elements：For when the alternative target cell is to need the Microcell using RE technology, to covering The macro base station controller of the macrocell of lid service Microcell sends ABS request instructions, and the ABS request instructions include preparing mesh Mark cell is the reserved resource informations of the mobile UE；

ABS confirms instruction reception unit：Instruction is confirmed for receiving ABS；

Acquiring unit five：Switching condition is avoided for obtaining the table tennis for being switched to the alternative target cell；

Switching command transmitting element：For switching command being sent to the mobile UE, carry the preparation in the switching command The cell ID of Target cell and the RE biases；

Switching indicates receiving unit：Switching for receiving from the mobile UE is indicated；

Switching performance element：For when the Target cell is identical with the cell ID of the alternative target cell, controlling institute State mobile UE and be switched to the alternative target cell；Different with the cell ID of the alternative target cell in the Target cell When, control the mobile UE and be switched to the Target cell, discharge the channel reservation resource of the alternative target cell.

6. a kind of micro-base station controller according to claim 5, it is characterised in that：The UE measuring states information Store list Unit includes：

Acquisition module I：For inquiring about measurement report memory cell, the time of measuring difference Δ t of measurement report twice is obtained recently；

Enquiry module II：For inquiring about neighboring BS information table, any three adjacent base stations a, the positional information of b, c and transmitting work(is obtained Rate；

Acquisition module III：For inquiring about measurement report memory cell, second from the bottom measurement report is obtained；

Determining module IV：For determining second from the bottom measurement report measurement position m, according to adjacent base station a, the RSRP of b, c is reported Value, positional information and transmission power, determine the RSRP equivalence rings of three base stations, the intersection point of three RSRP equivalence rings are determined For measurement position m；

Acquisition module V：For inquiring about measurement report memory cell, the last measurement report is obtained；

Determining module VI：For determining the last measurement report measurement position n, according to adjacent base station a, the RSRP report values of b, c, Positional information and transmission power, determine the RSRP equivalence rings of three base stations, the intersection point of three RSRP equivalence rings are defined as Measurement position n；

Computing module VII：The current translational speeds of the mobile UE are calculated according to Δ t, m and n；

Computing module VIII：The current moving directions of the mobile UE are calculated according to m and n.

7. a kind of micro-base station controller according to claim 5, it is characterised in that：

The acquiring unit two includes：

Acquisition module I：For inquiring about measurement report memory cell, obtain current time and last time measurement report time of measuring when Between poor；

Enquiry module II：For inquiring about UE measuring state information memory cells, obtain the last measurement report measurement position, Translational speed, moving direction；

Computing module III：Nearest one inquired for the time span that obtained according to acquisition module I and enquiry module II Measurement position, translational speed in secondary measurement report, moving direction are calculated the current location A；

The acquiring unit three includes：

Acquisition module I：For inquiring about neighboring BS information table, obtain in front of the mobile UE front cell ID of cell and its with The base distance between sites ISD of service Microcell；

Determining module II：For front cell ID to be defined as the cell ID of alternative target cell；

Acquisition module III：For inquiring about ISD- adjacency mapping tables, the corresponding adjacencies of the ISD are obtained.

8. a kind of micro-base station controller according to claim 5, it is characterised in that：The updating block one includes：

Acquisition module I：For inquiring about the result of acquiring unit three, adjacent Microcell and clothes that the mobile UE may be moved into are obtained The adjacency of business Microcell；

Judge module II：For judging whether the adjacency is distant, update module III is if so, then gone to, otherwise,

Go to acquisition module IV；

Update module III：For the macrocell for covering service Microcell is updated to the alternative target cell；

Acquisition module IV：For inquiring about UE measuring state information memory cells, the current translational speeds of the mobile UE are obtained；

Judge module V：For judging whether the present speed of the mobile UE is low speed, if so, then goes to update module III, Otherwise, do not update.