WO2013185356A1

WO2013185356A1 - Handover method, device and system

Info

Publication number: WO2013185356A1
Application number: PCT/CN2012/077047
Authority: WO
Inventors: 解应春
Original assignee: 华为技术有限公司
Priority date: 2012-06-15
Filing date: 2012-06-15
Publication date: 2013-12-19
Also published as: CN102934479B; CN102934479A

Abstract

Embodiments of the present invention belong to the technical field of communications and provide a handover method, device, and system, so as to improve the handover success rate. The handover method comprises: delivering a periodic measurement configuration message to a terminal, and receiving a measurement report periodically reported by the terminal according to the periodic measurement configuration message; selecting a preset handover model of the terminal according to the measurement report periodically reported by the terminal, and determining a model parameter in the preset handover model; determining a handover moment according to the handover model parameter, a preset target handover value, and the preset handover model; and delivering a handover command to the terminal at the handover moment. The present invention applies to the field of communications.

Description

The present invention relates to the field of communications technologies, and in particular, to a handover method, device, and system. Background Art Generally, in a wireless communication process, a terminal is located within a wireless coverage of a wireless communication system and communicates with a wireless communication system via a wireless communication channel. The wireless communication channel divides the electromagnetic wave frequency into a plurality of carrier frequencies, and one carrier frequency is a wireless channel. The wireless communication system provides wireless coverage over a certain geographic area by using a designated radio channel (eNB, evolved Node B), which is called a small area. Typically, the eNB is located in the center of the cell. When the terminal moves from the source cell to the target cell, or when the source cell or channel interference is large, in order to maintain communication quality, the terminal needs to perform handover of the source cell base station and the target cell base station.

The handover process of the Long Term Evolution (LTE) system is divided into: a handover preparation phase, a handover execution phase, and a handover completion phase. In the handover preparation phase, a handover decision is made based on the measurement report. When the measurement parameter of the cell in the measurement report sent by the terminal reaches the handover parameter and the handover threshold, the adjacent cell is sent as a candidate cell to the handover request. In the candidate cell that returns the handover request acknowledgement, one cell having the best signal quality is selected as the target cell according to the measurement report.

In the above handover decision process, the same handover parameters and switching thresholds are used for all terminals of the source cell, and the factors such as the moving speed, the switching position, and the shadow fading of the terminal at the time of switching are not considered, which causes the switching time to be unreasonable and affects the handover success rate. SUMMARY OF THE INVENTION Embodiments of the present invention provide a handover method, apparatus, and system for improving handover success rate.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

In one aspect, providing a switching method, including, Sending a periodic measurement configuration message to the terminal, and receiving a measurement report that is periodically reported by the terminal according to the periodic measurement configuration message, where the periodic measurement configuration message includes a reporting period and a measurement quantity of the terminal, The measurement report includes a value of the measured quantity;

Selecting a preset switching model of the terminal according to the measurement report periodically reported by the terminal, and determining a model parameter in the preset switching model; wherein the preset switching model is the measured quantity with respect to the measurement time and a function of the model parameters;

Determining a switching moment according to the switching model parameter, a preset target switching value, and the preset switching model;

A handover command is sent to the terminal at the time of the handover.

In one aspect, providing a switching method, including,

The measurement is performed according to the periodic measurement configuration message sent by the base station. When the signal quality meets the handover reporting condition, the measurement result is periodically reported to the base station by using the measurement report. The periodic measurement configuration message includes the reporting period and the measurement quantity of the terminal. The measurement report includes a value of the measured quantity;

When the handover command of the base station is received, handover is performed.

In one aspect, providing a switching method, including,

And sending a preset measurement configuration parameter to the terminal by using the measurement configuration message, and receiving the measurement report reported by the terminal, and when the handover preparation is completed, sending a handover command to the terminal; where the preset measurement configuration parameter The obtaining includes: sending a periodic measurement configuration message to the multiple terminals, and receiving a measurement report that is periodically reported by the terminal according to the periodic measurement configuration message, where the periodic measurement configuration message includes reporting by the terminal a period and a measurement quantity, the measurement report includes a value of the measurement quantity; selecting a preset switching model of the corresponding terminal according to the measurement report periodically reported by each terminal, and determining a model parameter in the preset switching model, The preset switching model is a function of measuring time and measurement quantity, and the model parameter; determining a model parameter of the source cell according to the model parameter of each terminal, according to the model parameter of the source cell, a preset target Switching the value and the preset model, selecting among the commonly used switching measurement configuration parameters Preset handover measurement configuration parameters.

In one aspect, providing a first base station, including,

a configuration module, configured to send a periodic measurement configuration message to the terminal, where the periodic measurement The quantity configuration message includes a reporting period and a measurement quantity of the terminal;

a receiving module, configured to receive a measurement report periodically reported by the terminal according to the periodic measurement configuration message, where the measurement report includes a value of the measured quantity;

An operation module, configured to select a preset switching model of the terminal according to the measurement report periodically reported by the terminal, and determine a model parameter in the preset switching model; and switch according to the switching model parameter and a preset target The value and the preset switching model determine a switching moment; wherein the preset switching model is a function of the measurement quantity with respect to a measurement time and the model parameter; and, on the one hand, providing a terminal, including,

The measurement reporting module is configured to perform measurement according to the periodic measurement configuration message sent by the base station. When the signal quality meets the handover reporting condition, the measurement result is periodically reported to the base station by using the measurement report. The periodic measurement configuration message includes the Determining a reporting period and a measurement quantity of the terminal, where the measurement report includes a value of the measurement quantity;

And a receiving execution module, configured to perform a handover when receiving a handover command of the base station. In one aspect, a first communication system is provided, including a source cell base station, a target cell base station, and a terminal, wherein the source cell base station is the first base station, and the terminal is the first terminal.

In one aspect, a second base station is provided, characterized in that,

a pre-processing module, configured to send a periodic measurement configuration message to a plurality of terminals, and receive a measurement report periodically reported by each terminal according to the periodic measurement configuration message, according to the measurement report periodically reported by each terminal Selecting a preset switching model of the corresponding terminal, and determining model parameters in the respective preset switching models; determining model parameters of the source cell according to the model parameters of the respective terminals, according to model parameters of the source cell, preset a target switching value and the preset model, and selecting a preset measurement configuration parameter among commonly used measurement configuration parameters;

a measurement configuration module, configured to send the preset measurement configuration parameter to the terminal by using a measurement configuration message;

a receiving module, configured to receive a measurement report reported by the terminal;

The sending module is configured to send a switching command to the terminal when the handover preparation is completed. In one aspect, a second communication system is provided, including a source cell base station and a target cell base A station and a terminal, wherein the source cell base station is the second base station.

The handover method, device and device provided by the embodiment of the present invention comprehensively consider the channel environment, the terminal movement speed and the attenuation of the measurement quantity through the measurement report periodically reported by the terminal, select a reasonable switching time, and improve the handover success rate.

BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and obviously, in the following description The drawings are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work. FIG. 1 is a flowchart of a handover method according to an embodiment of the present invention;

2 is a flowchart of another handover method according to an embodiment of the present invention;

FIG. 3 is a flowchart of still another handover method according to an embodiment of the present invention;

4 is a flowchart of still another handover method according to an embodiment of the present invention;

FIG. 5 is a flowchart of still another handover method according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a first base station according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a first terminal according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a second base station according to an embodiment of the present invention.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. The technical solution of the present invention can be applied to various communication systems, such as: Global System of Mobile communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access ( WCDMA, Wideband Code Division Multiple Access Wireless), General Packet Radio Service (GPRS), Long Term Evolution (LTE), etc. The base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station (eNB or e-NodeB, evolved Node B) in LTE. The invention is not limited.

The switching method provided by the embodiment of the present invention, as shown in FIG. 1 , includes

101. Send a periodic measurement configuration message to the terminal, and receive, by the terminal, a periodic measurement report according to the periodic measurement configuration message.

The periodic measurement configuration message includes a reporting period and a measurement quantity of the terminal, and the measurement report includes a value of the measurement quantity.

The reporting period of the terminal is set according to the reporting frequency of the terminal and the timeliness of switching.

102. Select a preset switching mode of the terminal according to the measurement report periodically reported by the terminal, and determine a model parameter in the preset switching model.

The preset switching model is a function of the measured quantity with respect to the measurement time and the model parameter.

103. Determine a switching moment according to the switching model parameter, a preset target switching value, and the preset switching model.

104. Send a handover command to the terminal at the time of the handover.

The handover method provided by the embodiment of the present invention comprehensively considers the channel environment, the terminal movement speed, and the attenuation of the measurement quantity through the measurement report periodically reported by the terminal, selects a reasonable switching time, and improves the handover success rate.

Another switching method provided by the embodiment of the present invention, as shown in FIG. 2, includes

201. Perform measurement according to the periodic measurement configuration message sent by the base station. When the signal quality meets the handover reporting condition, the measurement result is periodically reported to the base station through the measurement report.

202. Perform a handover when receiving a handover command of the base station.

Another switching method provided by the embodiment of the present invention, as shown in FIG. 3, includes 301. The source cell base station sends a periodic measurement configuration message to the terminal.

The periodic measurement configuration message includes a reporting period and a measurement quantity of the terminal, and the measurement report includes a value of the measurement quantity. Sexual settings. The shorter the reporting period of the terminal is, the higher the reporting frequency is, and the later the terminal is switched. According to the existing communication protocol, the reporting period of the terminal can be selected as 120ms, 240ms. Measured amount can be signal strength or signal quality. For example, RSRP (Reference Signal Receiving Power), RSRQ (Reference Signal Receiving Quality, The reference signal receives the quality power), BOTH (ie, RSRP and RSRQ), etc., wherein the delay reporting time TTT of each measurement report is set to be short, for example, 0 ms.

302. The terminal performs measurement according to the periodic measurement configuration message sent by the source cell base station. When the signal quality meets the handover reporting condition, the measurement result is periodically reported to the base station by using the measurement report.

The periodic measurement configuration message includes a reporting period and a measurement quantity of the terminal. The measurement report includes a value of the measured amount of the terminal. For example, the reporting period in the periodic measurement configuration message is 120 ms, and the measurement quantity is RSRP. After the signal quality measured by the terminal meets the handover reporting condition, the terminal reports the measurement report to the source cell base station every 120 ms, where the measurement report includes the source cell. Or the value of the target cell RSRP.

303. The source cell base station receives the measurement report periodically reported by the terminal according to the periodic measurement configuration message, selects a preset handover model of the terminal according to the measurement report periodically reported by the terminal, and determines the preset handover. Model parameters in the model.

Specifically, the measurement sequence of the channel quality is obtained according to the measurement report periodically reported by the terminal. For example, , ), ( ;^),...,( ;^) , where t is the time of measurement or reporting, and Y can be the absolute value of the measured quantity (ie, the value of the measured quantity of the source cell or the target cell), It may also be a relative value of the measured quantity (ie, the measured quantity difference between the target cell and the source cell).

According to the change of the measured quantity value in the above measurement sequence, a preset switching model is selected, and the model parameters in the preset switching model are determined. The preset switching model is a function of the measured quantity with respect to the measured or reported time t, the measured quantity value Y, and the model parameter. For example, when the measurement sequence of the terminal is { ( 120 , 0 ) , ( 240 , 1 ) , ( 360 , 1.5 ) , ( 480 , 2 ) } , the preset switching model is selected as a linear model, ie y = "6 The model parameters k and b can be obtained according to the above measurement sequence. k = - kxt

N _ N

Where '· ⁼¹ , '· ⁼¹

Of course, the prediction model can also be selected as a nonlinear model based on the change in the measured value in the terminal measurement sequence. For example, the nonlinear model can be a parabolic model

Y = at ² + bt + c , hyperbolic model = + exponential model = + logarithmic model y = a + 6h, etc.

304. The source cell base station determines a handover time according to the handover model parameter, a preset target handover value, and the preset handover model.

Specifically, the source cell base station is pre-set with a target handover value!^ _gCT , which represents a value that the measurement quantity of the handover time should reach. Wherein, when the value of the measured quantity is selected as the relative value, ^ is selected as the relative value, and when the value of the measured quantity is selected as the absolute value, 1^ also uses the absolute value. Then the switching moment of the terminal is satisfied.

According to this, the switching moment k of the terminal can be obtained. For example, when the source cell base station determines that the handover time is reached, the source cell base station sends a handover command to the terminal.

306. When the terminal receives the handover command of the source cell base station, the terminal performs handover.

The handover method provided by the embodiment of the present invention comprehensively considers the channel environment, the terminal movement speed, and the attenuation of the measurement quantity through the measurement report periodically reported by the terminal, selects a reasonable switching time, and improves the handover success rate. At the same time, different switching moments can be selected for different terminals to improve the switching success rate.

Another switching method provided by the embodiment of the present invention, as shown in FIG. 4, includes

401. The source cell base station sends a preset measurement configuration parameter to the terminal by using a measurement configuration message.

The obtaining, by the preset measurement configuration parameter, includes,

And sending a periodic measurement configuration message to the multiple terminals, and receiving a measurement report that is periodically reported by the terminal according to the periodic measurement configuration message, where the periodic measurement configuration message includes a reporting period of the terminal and a measurement amount, the measurement report including a value of the measurement amount;

Selecting a preset cut of the corresponding terminal according to the measurement report periodically reported by each terminal Replacing a model, and determining a model parameter in the preset switching model; wherein the preset switching model is a function of a measurement time and a measurement quantity, and the model parameter;

Determining a model parameter of the source cell according to the model parameter of each terminal, selecting a preset measurement according to a model parameter of the source cell, a preset target switching value, and the preset model, among commonly used switching measurement configuration parameters. Configuration parameters.

The source cell base station receives the measurement report reported by the terminal, and when the handover preparation is completed, sends a handover command to the terminal.

In the handover method provided by the embodiment of the present invention, the channel environment, the terminal movement speed, and the attenuation of the measurement quantity are comprehensively considered by processing the measurement report periodically reported by multiple terminals in the source cell, and the preset is selected for the source cell. The measurement configuration parameters are switched, and the preset measurement configuration parameters are sent to the terminal through the measurement configuration message. When the handover preparation is completed, the handover command is sent to the terminal to improve the handover success rate.

Another switching method provided by the embodiment of the present invention, as shown in FIG. 5, includes

501. The source cell base station sends a preset measurement configuration parameter to the terminal by using a measurement configuration message.

The obtaining, by the preset measurement configuration parameter, includes,

501. The source cell base station sends a periodic measurement configuration message to the multiple terminals, and receives a measurement report that is periodically reported by the terminal according to the periodic measurement configuration message, where the periodic measurement configuration message includes The reporting period and the measured quantity of the terminal, the measurement report including the value of the measured quantity.

The source cell base station selects a preset handover model of the corresponding terminal according to the measurement report periodically reported by each terminal, and determines a model parameter in the preset handover model. The preset handover model is related to the measurement time. And the measured quantity, as well as the function of the model parameters.

The specific processes performed by the respective terminals and the base stations in steps 501 1 and 5012 are the same as steps 301 and 303, and are not described herein again.

The model parameter of the source cell is determined according to the model parameter of each terminal, and the selected switch measurement configuration parameter is selected according to the model parameter of the source cell, the preset target switching value, and the preset model. Preset measurement configuration parameters.

The model parameters of the source cell may be average values, weighted average values, maximum values of the ratios, and boundary extreme values of the model parameters of each terminal according to actual conditions.

For example, when the preset model of each terminal is a linear model y = ^"6, according to each end The average value of the model parameters of the terminal is selected from the measurement configuration parameters commonly used in the communication protocol. That is, one TTT and one Thr are respectively selected in the commonly used multiple handover parameter value TTT and the commonly used multiple handover threshold Thr as the preset measurement configuration parameters in the cell, so that χτττ+τ^ is closest to the source cell base station. The preset target switching value g ^CT . Among them, the switching threshold Thr is obtained by combining several other parameters. If ^^ is a relative value, the switching threshold Thr is also a relative value; if it is an absolute value, Thr is also an absolute value.

The source cell base station sends the preset measurement configuration parameters in the cell to the terminal by using the measurement configuration message.

502. The terminal performs measurement according to the measurement configuration message sent by the base station. When the signal quality meets the handover reporting condition, the measurement result is reported to the base station by using the measurement report.

503. The source cell base station receives the measurement report reported by the terminal, and when the handover preparation is completed, sends a handover command to the terminal.

504. When the terminal receives the handover command of the source cell base station, perform handover.

The embodiment of the present invention further provides a first base station, as shown in FIG. 6, the base station includes: a configuration module 601, configured to send a periodic measurement configuration message to the terminal, where the periodic measurement configuration message includes a reporting period of the terminal And measurement volume.

The receiving module 602 is configured to receive a measurement report periodically reported by the terminal according to the periodic measurement configuration message, where the measurement report includes a value of the measured quantity.

The operation module 603 is configured to select a preset switching model of the terminal according to the measurement report periodically reported by the terminal, and determine a model parameter in the preset switching model; according to the switching model parameter, a preset target The switching value and the preset switching model determine a switching moment; wherein the preset switching model is a function of the measured quantity with respect to a measurement time and the model parameter. The embodiment of the present invention further provides a first terminal, as shown in FIG. 7, the terminal includes The measurement reporting module 701 is configured to perform measurement according to the periodic measurement configuration message sent by the base station. When the signal quality meets the handover reporting condition, the measurement result is periodically reported to the base station by using the measurement report. The periodic measurement configuration message includes The reporting period and the measured quantity of the terminal, and the measurement report includes the value of the measured quantity.

The receiving execution module 702 is configured to perform a handover when receiving a handover command of the base station. The embodiment of the present invention further provides a first communication system, including a source cell base station, a target cell base station, and a terminal, where the source cell base station is the first base station in FIG. 7, and the terminal is the first terminal.

The first base station shown in FIG. 6 and the first terminal shown in FIG. 7 and the working mechanism of the first communication system are the same as those in the embodiment shown in FIG. 1 to FIG. 3, and are not described herein.

The embodiment of the present invention further provides a second base station, as shown in FIG. 8, the base station includes: a pre-processing module 801, configured to send a periodic measurement configuration message to multiple terminals, and receive the respective terminals according to the cycle. The measurement report periodically reported by the sex measurement configuration message, selecting a preset handover model of the corresponding terminal according to the measurement report periodically reported by each terminal, and determining model parameters in the respective preset handover models; The model parameter determines a model parameter of the source cell, and selects a preset measurement configuration parameter among the commonly used measurement configuration parameters according to the model parameter of the source cell, the preset target switching value, and the preset model.

The measurement configuration module 802 is configured to send the preset measurement configuration parameter to the terminal by using a measurement configuration message.

The receiving module 803 is configured to receive the measurement report reported by the terminal.

The sending module 804 is configured to send a switching command to the terminal when the handover preparation is completed. The embodiment of the present invention further provides a second communication system, including a source cell base station, a target cell base station, and a terminal, where the source cell base station is the second base station in Figure 8, when the terminal receives the periodic measurement configuration message sent by the base station. The terminal is the first terminal shown in FIG. 7. When the terminal receives the preset measurement configuration parameter sent by the base station by using the measurement configuration message, the terminal is an existing terminal.

The working mechanism of the second base station shown in FIG. 8 and the working mechanism of the foregoing second communication system is the same as that of the embodiment shown in FIG. 4 to FIG. 5, and details are not described herein.

The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is It is to be understood that those skilled in the art are susceptible to variations and substitutions within the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

Claim

A switching method, characterized in that,

Sending a periodic measurement configuration message to the terminal, and receiving a measurement report that is periodically reported by the terminal according to the periodic measurement configuration message, where the periodic measurement configuration message includes a reporting period and a measurement quantity of the terminal, The measurement report includes a value of the measured quantity;

A handover command is sent to the terminal at the time of the handover.

The method according to claim 1, wherein the reporting period of the terminal is set according to the reporting frequency and switching timelines of the terminal.

3. A switching method, characterized in that,

4. A handover method, characterized in that the method comprises

And sending a preset measurement configuration parameter to the terminal by using the measurement configuration message, and receiving the measurement report reported by the terminal, and when the handover preparation is completed, sending a handover command to the terminal; where the preset measurement configuration parameter The obtaining includes: sending a periodic measurement configuration message to the multiple terminals, and receiving a measurement report that is periodically reported by the terminal according to the periodic measurement configuration message, where the periodic measurement configuration message includes reporting by the terminal a period and a measurement quantity, the measurement report includes a value of the measurement quantity; selecting a preset switching model of the corresponding terminal according to the measurement report periodically reported by each terminal, and determining a model parameter in the preset switching model, The preset switching model is a function of measuring time and measurement quantity, and the model parameter; determining a model parameter of the source cell according to the model parameter of each terminal, according to the model parameter of the source cell, a preset target Switching the value and the preset model, selecting the preset in a commonly used switching measurement configuration parameter Measurement configuration parameters.

The method according to claim 4, wherein the reporting period of the terminal is set according to the reporting frequency and switching timeliness of the terminal.

6. A base station, characterized in that

a configuration module, configured to send a periodic measurement configuration message to the terminal, where the periodic measurement configuration message includes a reporting period and a measurement quantity of the terminal;

An operation module, configured to select a preset switching model of the terminal according to the measurement report periodically reported by the terminal, and determine a model parameter in the preset switching model; and switch according to the switching model parameter and a preset target And the preset switching model determines a switching moment; wherein the preset switching model is a function of the measured quantity with respect to a measurement time and the model parameter;

7. A terminal, characterized in that,

And a receiving execution module, configured to perform a handover when receiving a handover command of the base station.

A communication system, comprising a source cell base station, a target cell base station, and a terminal, wherein the source cell base station is the base station according to claim 6, and the terminal is the terminal according to claim 7.

9. A base station, characterized in that

a measurement configuration module, configured to send the preset measurement to the terminal by using a measurement configuration message Quantity configuration parameter;

The sending module sends a switching command to the terminal when the switching preparation is completed.

A communication system, comprising a source cell base station, a target cell base station, and a terminal, wherein the source cell base station is the base station according to claim 9.