CN108243470B

CN108243470B - Cell switching method and base station

Info

Publication number: CN108243470B
Application number: CN201611220472.3A
Authority: CN
Inventors: 邵方; 刘春�
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2016-12-26
Filing date: 2016-12-26
Publication date: 2020-11-03
Anticipated expiration: 2036-12-26
Also published as: CN108243470A

Abstract

The embodiment of the invention provides a cell switching method and a base station, wherein the cell switching method comprises the following steps: receiving a first RSRP value corresponding to a serving cell and a second RSRP value corresponding to a target cell, which are measured by a user terminal UE; inserting corresponding penalty values into the first RSRP value and the second RSRP value respectively to obtain a third RSRP value corresponding to the serving cell and a fourth RSRP value corresponding to the target cell; and if the third RSRP value and the fourth RSRP value accord with the preset cell switching condition, switching the UE from the serving cell to the target cell. Therefore, when the user terminal moves at a high speed between the serving cell and the target cell, the high-speed uploading and downloading speed can be kept, the probability of disconnection of the user terminal is effectively reduced, the switching success rate of the user terminal between the serving cell and the target cell is improved, and the user experience is further improved.

Description

Cell switching method and base station

Technical Field

The embodiment of the invention relates to the field of communication, in particular to a cell switching method and a base station.

Background

In the current society, because traffic accidents occur frequently, traffic management departments increase the traffic safety protection force on long-distance passenger buses, and comprehensively use various administrative and technical means to ensure the traffic safety monitoring and examination.

In order to solve the above problems, the technical scheme adopted in the prior art is as follows: and GPS tracking and positioning records and video monitoring storage. However, there are still some limitations in the prior art solutions, such as: the GPS positioning can only ensure that the passenger regular bus runs along a normal route, the video monitoring and storing can only be used for post analysis or daily inspection, and the monitoring video is required to be completely stored.

At present, the video monitoring return based on the LTE system can enable an operator to perform post analysis and dynamic control in the process according to the content of the video monitoring return, and meanwhile, the integrity of the monitoring video can be ensured. However, in actual operation, since the long-distance buses are driven too fast on the highway, in the video monitoring and feedback based on the LTE system in the prior art, the user terminal switching is uncontrollable and often operates in a low coverage area or a boundary area, so that the data transmission rate is very low or problems of dropped lines and dropped zeros of the data transmission rate are caused, thereby resulting in poor user experience.

Disclosure of Invention

The embodiment of the invention provides a cell switching method and a base station, which are used for solving the problems of low data transmission rate and poor user experience after switching caused by uncontrollable user terminal switching under the condition that a user terminal moves at a high speed in the prior art.

In order to solve the above problem, the present invention discloses a cell switching method, which is applied to a base station, and the method comprises:

receiving a first RSRP value corresponding to a serving cell and a second RSRP value corresponding to a target cell, which are measured by a user terminal UE;

inserting corresponding penalty values into the first RSRP value and the second RSRP value respectively to obtain a third RSRP value corresponding to the serving cell and a fourth RSRP value corresponding to the target cell;

and if the third RSRP value and the fourth RSRP value accord with the preset cell switching condition, switching the UE from the serving cell to the target cell.

In a preferred embodiment of the present invention, before the step of receiving the first RSRP value corresponding to the serving cell and the second RSRP value corresponding to the target cell measured by the UE, the method further includes:

receiving a plurality of serving cell RSRP measurement values and a plurality of target cell RSRP measurement values measured by UE;

determining a cut-out threshold corresponding to the serving cell and a cut-in threshold corresponding to the target cell according to the RSRP measurement values of the serving cells, the RSRP measurement values of the target cells and a preset cell switching condition;

sending the plurality of RSRP measurement values of the serving cell, the plurality of RSRP measurement values of the target cell, the cut-out threshold and the cut-in threshold to a management device, so that the management device calculates a first penalty value corresponding to the serving cell and a second penalty value corresponding to the target cell according to the plurality of RSRP measurement values of the serving cell, the plurality of RSRP measurement values of the target cell, the cut-out threshold and the cut-in threshold;

and acquiring the first penalty value and the second penalty value from the management device side.

In a preferred embodiment of the present invention, after the step of receiving the first RSRP value corresponding to the serving cell and the second RSRP value corresponding to the target cell measured by the UE, the method further includes:

sending the first RSRP value and the second RSRP value to a management device so as to calculate a third penalty value corresponding to the service cell and a fourth penalty value corresponding to the target cell through the management device;

and acquiring the third penalty value and the fourth penalty value from the management device side.

In a preferred embodiment of the invention, the method further comprises:

if the UE accesses the serving cell again, inserting a third penalty value into a received fifth RSRP value which is measured by the UE and corresponds to the serving cell; and the number of the first and second groups,

inserting a fourth penalty value to a received sixth RSRP value corresponding to the target cell measured by the UE.

In a preferred embodiment of the present invention, determining whether the third RSRP value and the fourth RSRP value meet a preset cell handover condition according to the following method includes:

judging whether the difference value between the fourth RSRP value and the third RSRP value is larger than a preset threshold value or not;

if so, judging that the third RSRP value and the fourth RSRP value accord with the preset cell switching condition.

According to another aspect of the present invention, there is provided a base station including:

a first receiving module, configured to receive a first RSRP value corresponding to a serving cell and a second RSRP value corresponding to a target cell, which are measured by a user equipment UE;

the inserting module is used for inserting corresponding penalty values into the first RSRP value and the second RSRP value respectively so as to obtain a third RSRP value corresponding to the serving cell and a fourth RSRP value corresponding to the target cell;

and the switching module is used for switching the UE from the serving cell to the target cell if the third RSRP value and the fourth RSRP value accord with the preset cell switching condition.

In a preferred embodiment of the present invention, the base station further includes:

a second receiving module, configured to receive multiple serving cell RSRP measurement values and multiple target cell RSRP measurement values measured by the UE;

the determining module is used for determining a cut-out threshold corresponding to the serving cell and a cut-in threshold corresponding to the target cell according to the RSRP measurement values of the serving cells, the RSRP measurement values of the target cells and a preset cell switching condition;

the device comprises a sending module, a switching-in module and a switching-out module, wherein the sending module is used for sending the plurality of service cell RSRP measurement values, the plurality of target cell RSRP measurement values, the switching-out threshold and the switching-in threshold to the management equipment so that the management equipment can calculate a first penalty value corresponding to the service cell and a second penalty value corresponding to the target cell according to the plurality of service cell RSRP measurement values, the plurality of target cell RSRP measurement values, the switching-out threshold and the switching-in threshold;

and the acquisition module is used for acquiring the first penalty value and the second penalty value from the management equipment terminal.

In a preferred embodiment of the present invention, the sending module is further configured to send the first RSRP value and the second RSRP value to the management device, so as to calculate, by the management device, a third penalty value corresponding to the serving cell and a fourth penalty value corresponding to the target cell;

correspondingly, the obtaining module is further configured to obtain the third penalty value and the fourth penalty value from the management device side.

In a preferred embodiment of the present invention, the insertion module is further configured to:

In a preferred embodiment of the present invention, the determining, by the handover module, whether the third RSRP value and the fourth RSRP value meet the preset cell handover condition according to the following method includes:

Compared with the prior art, the method and the device have the advantages that the first RSRP value corresponding to the serving cell and the second RSRP value corresponding to the target cell, which are measured by the user equipment UE, are received; inserting corresponding penalty values into the first RSRP value and the second RSRP value respectively to obtain a third RSRP value corresponding to the serving cell and a fourth RSRP value corresponding to the target cell; and if the third RSRP value and the fourth RSRP value accord with the preset cell switching condition, switching the UE from the serving cell to the target cell. Therefore, when the user terminal moves at a high speed between the serving cell and the target cell, the high-speed uploading and downloading speed can be kept, the probability of disconnection of the user terminal is effectively reduced, the switching success rate of the user terminal between the serving cell and the target cell is improved, and the user experience is further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a flowchart of a cell switching method according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating specific steps of a cell handover method according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of an OMC structure according to an embodiment of the present invention;

fig. 4 is a flow chart of a cell handover procedure in an embodiment of the present invention;

fig. 5 is a block diagram of a base station in an embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application.

Referring to fig. 1, a flowchart of a cell handover method according to an embodiment of the present invention is shown, where the method is applied to a base station, and specifically includes the following steps:

step 101, receiving a first RSRP value corresponding to a serving cell and a second RSRP value corresponding to a target cell, which are measured by a user equipment UE.

Specifically, in the embodiment of the present invention, after a UE (user equipment) accesses a serving cell, a base station to which the serving cell belongs (to distinguish a base station to which a target cell belongs, hereinafter referred to as a serving base station) sends a measurement request to the UE, where the measurement request carries a configuration file required for measurement, so that the UE performs measurement of an RSRP (reference signal Receiving Power) value according to the configuration file.

The UE measures a first RSRP value corresponding to the serving cell and a second RSRP value corresponding to a target cell, which is a neighboring cell of the serving cell in the embodiment of the present invention. And the UE reports the measured first RSRP value and the measured second RSRP value to the serving base station.

The serving base station receives the first RSRP value and the second RSRP value.

And 102, inserting corresponding penalty values into the first RSRP value and the second RSRP value respectively to obtain a third RSRP value corresponding to the serving cell and a fourth RSRP value corresponding to the target cell.

Specifically, in the embodiment of the present invention, the serving base station locally searches whether penalty values corresponding to the serving cell and the target cell exist, and if the penalty values do not exist, it is determined that the UE deviates from the memory driving route, and the serving base station performs cell switching on the UE by using a switching method in the prior art.

And if the corresponding penalty values exist, the service base station inserts the corresponding penalty values into the first RSRP value and the second RSRP value respectively so as to obtain a third RSRP value corresponding to the service cell and a fourth RSRP value corresponding to the target cell. Therefore, the original RSRP value corresponding to the serving cell is raised, and the original RSRP value corresponding to the target cell is lowered.

And 103, if the third RSRP value and the fourth RSRP value accord with a preset cell switching condition, switching the UE from the serving cell to the target cell.

Specifically, in the embodiment of the present invention, the serving base station detects whether the third RSRP value and the fourth RSRP value meet the preset cell handover condition. If the UE is detected to be in the target cell, the serving base station switches the UE from the serving cell to the target cell. The specific handover method will be explained in detail in the following examples.

In summary, in the technical solution in the embodiments of the present invention, a first RSRP value corresponding to a serving cell and a second RSRP value corresponding to a target cell, which are measured by a terminal UE, are received; inserting corresponding penalty values into the first RSRP value and the second RSRP value respectively to obtain a third RSRP value corresponding to the serving cell and a fourth RSRP value corresponding to the target cell; and if the third RSRP value and the fourth RSRP value accord with the preset cell switching condition, switching the UE from the serving cell to the target cell. Therefore, when the terminal moves at a high speed between the serving cell and the target cell, the high-speed uploading and downloading speed can be kept, the probability of disconnection of the terminal is effectively reduced, the switching success rate of the terminal between the serving cell and the target cell is improved, and the user experience is further improved.

In addition, in a preferred embodiment of the present invention, before the step of receiving the first RSRP value corresponding to the serving cell and the second RSRP value corresponding to the target cell measured by the UE, the method further includes:

In a preferred embodiment of the invention, the method further comprises:

In order to make those skilled in the art better understand the cell handover method of the present invention, the following detailed description is made with specific embodiments.

Referring to fig. 2, a flowchart illustrating specific steps of a cell handover method according to an embodiment of the present invention is shown. In fig. 2:

step 201, initial stage.

Specifically, in the embodiment of the present invention, the initial stage specifically includes:

sub-step 2011, receiving a plurality of serving cell RSRP measurement values and a plurality of target cell RSRP measurement values measured by the UE.

Specifically, after detecting that the UE accesses the serving cell, the serving base station issues a measurement request to the UE, where the measurement request carries configuration information required for measurement, and in a preferred embodiment of the present invention, the configuration information includes, but is not limited to: the measurement interval time is preset.

In response to the measurement request, the UE measures, according to the configuration information, an RSRP value of the serving cell (i.e., an RSRP measurement value of the serving cell in the embodiment of the present invention) and an RSRP value of the target cell (i.e., an RSRP measurement value of the target cell in the embodiment of the present invention) at a preset measurement interval time.

After each Measurement, the UE sends an MR (Measurement Report) file to the serving base station, where the MR file includes a serving cell RSRP Measurement value and a target cell RSRP Measurement value measured this time.

The serving base station receives a plurality of MR files sent by the UE and obtains a plurality of RSRP measurement values of the serving cell and a plurality of RSRP measurement values of the target cell.

And a substep 2012, determining a handover threshold corresponding to the serving cell and a handover threshold corresponding to the target cell according to the plurality of serving cell RSRP measurement values, the plurality of target cell RSRP measurement values, and a preset cell handover condition.

Specifically, in the LTE (Long Term Evolution) standard, when a base station performs cell handover on a UE, it is necessary to determine relevant parameters according to a relevant algorithm and handover conditions to implement a cell handover process. The specific parameters include:

a. reference Signal Received Power (RSRP): i.e. for the cell to be considered, a linear average of the electromagnetic interference (RE) power contribution (in W) carrying the cell-specific reference signal over the measurement band to be considered.

b. Switching hysteresis difference (HOM): the RSRP difference between the current serving cell and the neighboring cell may be set according to different communication environments, and the size of the RSRP difference determines the length of the handover delay.

c. Time To Trigger (TTT): that is, the switching decision can be made only when a certain HOM condition is continuously satisfied in this period of time, and the TTT can effectively prevent the occurrence of "ping-pong effect" in the switching.

The above parameters need to satisfy a certain handover condition (i.e. a preset handover condition in the embodiment of the present invention) to perform cell handover on the UE, where the handover condition is:

the serving base station performs cell handover for the UE when the following conditions are continuously satisfied within a specified TTT.

RSRPT is more than RSRPS + HOM, wherein RSRPT is the RSRP measurement value of the target cell, and RSRPS is the RSRP measurement value of the service cell.

Therefore, in the embodiment of the present invention, the serving base station may determine, based on the above conditions, the received RSRP measurement values of the multiple serving cells and the RSRP measurement value of the target cell, to determine whether the UE may perform cell handover, and obtain the hand-out threshold value of the serving cell and the hand-in threshold value of the target cell.

Step 2013, sending the plurality of service cell RSRP measurement values, the plurality of target cell RSRP measurement values, the cut-out threshold and the cut-in threshold to the management device, so that the management device calculates a first penalty value corresponding to the service cell and a second penalty value corresponding to the target cell according to the plurality of service cell RSRP measurement values, the plurality of target cell RSRP measurement values, the cut-out threshold and the cut-in threshold.

Specifically, in the embodiment of the present invention, the serving base station sends the obtained RSRP measurement value, the cut-in threshold, and the cut-out threshold to the management device at a predetermined time interval, so that the management device calculates a first penalty value corresponding to the serving cell and a second penalty value corresponding to the target cell according to the parameters.

In the embodiment of the present invention, an OMC (Operation and maintenance center) is installed on the management device, and a schematic structural diagram of the OMC is shown in fig. 3, where in fig. 3: the OMC comprises: the system comprises an adaptive operation unit, a base station control interface, a CDR (Call Detail Record) interface and an MR interface.

In the embodiment of the present invention, the OMC may obtain, through the MR interface, an MR report sent by the serving base station, where the MR report includes multiple serving cell RSRP measurement values, multiple target cell RSRP measurement values, and corresponding hand-in/hand-out thresholds measured by the UE.

In the embodiment of the present invention, the OMC may further obtain a CDR service report through the CDR interface, where a trajectory of the current operation of the UE is recorded in the CDR service report. For example, the following steps are carried out: and if the UE runs from the service cell to the target cell, the CDR service report can be used for describing the running track of the UE, so that the OMC can acquire the running track of the UE.

Specifically, in the embodiment of the present invention, the adaptive operation unit in the OMC may perform operation of a penalty value according to the MR report and the CDR service report. The specific operation method is as follows:

1) and calculating Ki which is a penalty value set corresponding to the service cell.

In the embodiment of the invention, the OMC combines the MR report and the CDR service report to count the RSRP values of the multiple serving cells and the RSRP values of the target cell obtained from the time when the UE is on the current operation orbit, that is, from the time when the UE is accessed to the serving cell to the time when the UE is switched from the serving cell to the target cell.

The self-adaptive operation unit calculates a Ki set according to a formula Ki ═ service cell switching threshold-RSRP |.

2) A first penalty value corresponding to the serving cell is calculated.

And the self-adaptive operation unit takes the median of Ki normal distribution according to a normal distribution formula, namely the first penalty value K1.

3) And calculating Kj, wherein Kj is a penalty value set corresponding to the target cell.

And the self-adaptive unit calculates a set of Kj according to a formula Kj ═ target cell cut-in threshold-RSRP |.

4) And calculating a second penalty value corresponding to the target cell.

And the self-adaptive operation unit takes the median of the Kj normal distribution according to a normal distribution formula and takes the inverse result as a second penalty value K2. When K2 obtained by inverting the median is inserted into the second RSRP in the embodiment of the present invention, the RSRP value may be decreased.

In step 2014, a first penalty value and a second penalty value are obtained from the management device.

Specifically, in the embodiment of the present invention, the OMC sends the calculated first penalty value K1 and the second penalty value K2 to the serving base station.

The serving base station receives K1 and K2.

In addition, in the embodiment of the present invention, to further ensure the accuracy of the penalty value, the OMC may calculate the penalty value multiple times according to the above algorithm, and take the arithmetic average value to obtain a more accurate penalty value. For example, the following steps are carried out: the UE can continue to reciprocate 3-5 times on the operation track, so that the OMC obtains a plurality of penalty values of the serving cell, the OMC takes an arithmetic average of the plurality of penalty values, and the final penalty value of the serving cell is similar to the target cell penalty value, which is not repeated here.

With continued reference to fig. 2, fig. 2 also includes:

step 202, receiving a first RSRP value corresponding to the serving cell and a second RSRP value corresponding to the target cell, which are measured by the user equipment UE.

Specifically, in the embodiment of the present invention, after the UE accesses the serving cell, the base station to which the serving cell belongs sends a measurement request to the UE, where the measurement request carries a configuration file required for measurement, so that the UE performs measurement of an RSRP value according to the configuration file, where the configuration file may carry a preset measurement time interval.

And the UE measures the RSRP value of the serving cell and the RSRP value of the target cell according to the configuration file. In order to make the technical solution of the present invention better understood, the following detailed description is given with specific numerical values.

In this embodiment, after accessing the serving cell, the UE measures RSRP values of the serving cell and the target cell at preset measurement time intervals according to requirements of a configuration file, and obtains RSRP values of multiple pairs of serving cells and target cells: RSRPS1 (serving cell RSRP value), RSRPT1 (target cell RSRP value); RSRPS2, RSRPT 2; RSRPS3, RSRPT 3. And each time the UE measures a pair of RSRP values, a corresponding MR report is generated and sent to the service base station.

The serving base station extracts the RSRP value in each MR report received.

Step 203, inserting corresponding penalty values into the first RSRP value and the second RSRP value respectively to obtain a third RSRP value corresponding to the serving cell and a fourth RSRP value corresponding to the target cell.

Specifically, in this embodiment, each time the serving base station acquires one MR report, it first searches whether penalty values corresponding to the serving cell and the target cell exist locally, and if the penalty values do not exist, it is determined that the UE deviates from the memory driving route, and the serving base station performs cell switching on the UE by using a switching method in the prior art.

And if the corresponding penalty values exist, the service base station inserts the corresponding penalty values into the first RSRP value and the second RSRP value respectively so as to obtain a third RSRP value corresponding to the service cell and a fourth RSRP value corresponding to the target cell. Taking specific numerical values in the embodiment as examples:

and after the service base station acquires the RSRPS1 and the RSRPT1, the service base station determines that the UE still runs on the memorized running route.

The serving base station locally finds the penalty value K1 corresponding to the serving cell and the penalty value K2 corresponding to the target cell. Next, the serving base station inserts K1 into RSRPS1 and K2 into RSRPT1, respectively obtaining: RSRPS1 'and RSRPT 1'.

And 204, if the third RSRP value and the fourth RSRP value accord with the preset cell switching condition, switching the UE from the serving cell to the target cell.

Specifically, in the embodiment of the present invention, the determining, by the serving base station, whether the third RSRP value and the fourth RSRP value meet the preset cell handover condition according to the following method includes:

substep 2041, determining whether the difference between the fourth RSRP value and the third RSRP value is greater than a predetermined threshold;

and substep 2042, if yes, determining that the third RSRP value and the fourth RSRP value meet the predetermined cell switching condition.

The following description is given by taking the parameters in the present embodiment as examples:

the serving base station determines whether RSRPT1 '-RSRPS 1' > HOM holds.

In the present embodiment, it is obvious that the above condition does not hold.

The serving base station receives RSRPS2, RSRPT2 transmitted by the UE next time and calculates RSRPS2 ', RSRPT 2'. In this embodiment, RSRPS2 ', RSRPT 2' still do not meet the handover condition.

After the serving base station receives RSRPS3 and RSRPT3 and calculates RSRPS3 'and RSRPT 3', the serving base station determines RSRPT3 '-RSRPS 3' > HOM. In a preferred embodiment of the present invention, the serving base station may determine whether the above condition is continuously satisfied within the TTT time according to a preset TTT value.

And then, the service base station starts a cell switching process to switch the UE from the service cell to the target cell.

Further, in an embodiment of the present invention, after step 202, the method may further include:

1) the service base station sends the first RSRP value and the second RSRP value to the management device, so that a third penalty value corresponding to the service cell and a fourth penalty value corresponding to the target cell are calculated through the management device;

2) and the service base station acquires the third penalty value and the fourth penalty value from the management equipment terminal.

3) If the UE accesses the serving cell again, inserting a third penalty value into a received fifth RSRP value which is measured by the UE and corresponds to the serving cell; and the number of the first and second groups,

4) inserting a fourth penalty value to a received sixth RSRP value corresponding to the target cell measured by the UE.

Specifically, the serving base station still sends the received RSRP value to the OMC in an MR report form at a predetermined time interval, and the OMC may calculate a serving cell penalty value Km and a target cell Kn in the UE driving process.

Then, the OMC may arithmetically average the previously calculated penalty value K1 with Km, and the penalty value of the target cell is the same as that of the serving cell, which is not described herein. Therefore, the OMC can acquire the penalty value based on the driving process and send the penalty value to the service base station, so that the dynamic adjustment of the penalty value can be realized, and the penalty value is more accurate.

After the serving base station obtains the dynamically adjusted penalty value, if it is detected that the UE accesses the serving cell again, the corresponding dynamically adjusted penalty value can be inserted into the received RSRP value corresponding to the serving cell and the RSRP value corresponding to the target cell measured by the UE, so that the accuracy of the switching threshold and the user experience are further improved.

In the embodiment of the present invention, as shown in fig. 4, a flow chart of a handover process of a serving base station to handover a UE from a serving cell to a target cell is shown, which specifically includes:

step 1: the source eNode B (i.e., serving base station in the present embodiment) sends a handover request message to the target eNode B (i.e., target base station to which the target cell belongs in the present embodiment), which contains relevant information for handover preparation, including but not limited to: the context reference of the X2 and S1 signaling of the UE, the target cell identifier, the key KeyNode B, the RRC (Radio resource Control) context, the as (Access stratum) configuration, the E-UTRAN (enhanced UMTS Radio Access Network) Radio Access Bearer (E-UTRAN Radio Access Bearer, E-RAB) context, etc. And simultaneously, the method also comprises a source cell physical layer identifier and a message authentication verification code, and is used for a recovery process after possible switching failure. The X2 and S1 signaling context references of the UE may be used for the target eNode B to find the location of the source eNode B. The E-RAB context includes necessary Radio Network Layer (RLN) and Transport Layer (TNL) addressing information, Quality of service (QoS) information of the E-RAB, and the like. Some of the handover preparation information is contained in the interface message itself (e.g., the target cell identity) and another part exists in an RRC container (e.g., RRC context) of the interface message.

Step 2: and the target eNode B performs admission control according to the received E-RAB QoS information so as to improve the success rate of switching. The AS configuration used by the target cell may be completely independent of the complete configuration of the source cell, or may be incremental configuration based on the source cell (incremental configuration refers to that the same part is not configured, and different parts are reconfigured only by signaling, and the UE will continue to use the original configuration for configuration that is not received).

And step 3: the target eNode B proceeds with handover preparation of L1/L2 while sending a handover request ACK message to the source eNode B. The message includes an RRC container (radio resource controller), and the specific content is a handover command for triggering the UE to perform handover.

And 4, step 4: and the source eNode B switching command adopts a transparent transmission mode to send the message to the UE. The handover command includes a new C-RNTI and a security algorithm identifier of the target eNode B, and may also carry a random access dedicated Preamble code, an access parameter, system information, and the like. In an embodiment, the handover request ACK message may also carry RNL/TNL information for data forwarding. When the source eNode B receives the switching request ACK message or forwards the switching command to the UE, the data forwarding process can be carried out.

After receiving the message, the UE initiates a handover procedure using the relevant parameters in the message.

And 5: the source eNode B sends a Sequence Number (SN) state transmission message to the target eNodeB, and transmits an uplink PDCP (Packet Data Convergence Protocol) SN receiving state and a downlink PDCP SN sending state of the E-RAB. The receiving status of the uplink PDCP SN at least includes the PDCP SN of the last uplink SDU (Service Data Unit) received in sequence, and may also include the SN of the lost uplink SDU causing reception disorder expressed in the form of bit mapping. The downlink PDCP SN transmission status is used to indicate the next SDU sequence number that the target eNode B should assign. The source eNode B may omit this message if no E-RAB needs to deliver a status report of the PDCP.

Step 6: after receiving the switching command, the UE executes the synchronization with the target cell, if the special Preamble code for random access is configured in the switching command, the UE accesses the target cell by using the non-competitive random access process, and if the special Preamble code is not configured, the UE accesses the target cell by using the competitive random access process. The UE calculates the key needed to be used at the target eNode B and configures a security algorithm for communication with the target eNode B after handover is successful.

And 7: the network replies with an uplink resource allocation indication and a timing advance.

And 8: and after the UE is successfully accessed into the target cell, the UE sends an RRC connection reconfiguration completion message and confirms the completion of the switching process to the target eNodeB. This message may carry an improvement of the uplink Buffer Status Report (BSR) if the resources allow. The target eNode B confirms that the handover is successful by receiving the RRC connection reconfiguration complete message. To this end, the target eNode B can start transmitting data to the UE.

And step 9: the target eNode B sends a path switch request message to MME (Mobility Management Entity) to inform the UE that the serving cell has been switched.

Step 10: the MME sends a user plane update request message to the S-GW (Serving Gateway).

Step 11: and the S-GW switches the downlink data path to the target eNode B side. The S-GW sends one or more "end marker" packets to the source eNode B on the old path, i.e., the user plane resources of the source eNode B can be released.

Step 12: and the S-GW sends a user plane update response message to the MME.

Step 13: the MME sends a path switch request ACK message to the target eNode B. The purpose of this procedure is to switch the data path of the user plane from the source eNode B to the target eNode B. After the S-GW switches the downlink path, the downlink packets of the forwarded path and the new path may arrive alternately at the target eNode B. The target eNode B should first deliver all forwarded data packets to the UE and then deliver packets received from the new path. The use of this method at the target eNode B can enforce the correct transmission order. To assist the reordering function at the target eNode B, the S-GW sends one or more "end marker" packets on the old path immediately after the E-RAB switch path. The end marker packet contains no user data, indicated by the GTP header. After completing the transmission of the packet containing the identifier, the S-GW should not transmit any data packet on the old path. After receiving the "end marker" packet, the source eNode B shall send this packet to the target eNode B if forwarding is active for this bearer. After discovering the "end marker" packet, the target eNode B discards the "end marker" packet and initiates any necessary procedures to maintain the in-order delivery of the user.

Step 14: the target eNode B sends a UE context release message to the source eNode B, informing the source eNode B of the success of handover and triggering resource release of the source eNode B. The target eNode B sends this message after receiving the path switch ACK message sent back from the MME.

Step 15: after receiving the UE context release message, the source eNode B may release the radio bearer and the control plane resources related to the UE context, wherein the ongoing data forwarding will continue.

Referring to fig. 5, a block diagram of a base station according to an embodiment of the present invention is shown, where the base station may specifically include the following modules:

a first receiving module 501, configured to receive a first RSRP value corresponding to a serving cell and a second RSRP value corresponding to a target cell, which are measured by a user equipment UE.

An inserting module 502 is configured to insert corresponding penalty values into the first RSRP value and the second RSRP value, respectively, so as to obtain a third RSRP value corresponding to the serving cell and a fourth RSRP value corresponding to the target cell.

A switching module 503, configured to switch the UE from the serving cell to the target cell if the third RSRP value and the fourth RSRP value meet the preset cell switching condition.

and a second receiving module (not shown in the figure) for receiving the plurality of serving cell RSRP measurement values and the plurality of target cell RSRP measurement values measured by the UE.

And a determining module (not shown in the figure) configured to determine an out-cut threshold corresponding to the serving cell and an in-cut threshold corresponding to the target cell according to the plurality of serving cell RSRP measurement values, the plurality of target cell RSRP measurement values, and a preset cell handover condition.

A sending module (not shown in the figure), configured to send the multiple serving cell RSRP measurement values, the multiple target cell RSRP measurement values, the cut-out threshold, and the cut-in threshold to the management device, so that the management device calculates a first penalty value corresponding to the serving cell and a second penalty value corresponding to the target cell according to the multiple serving cell RSRP measurement values, the multiple target cell RSRP measurement values, the cut-out threshold, and the cut-in threshold.

And a obtaining module (not shown in the figure) for obtaining the first penalty value and the second penalty value from the management device side.

In a preferred embodiment of the present invention, the insertion module 502 is further configured to:

In a preferred embodiment of the present invention, the determining, by the switching module 503, whether the third RSRP value and the fourth RSRP value meet the preset cell switching condition according to the following method includes:

In summary, the base station in the embodiment of the present invention receives a first RSRP value corresponding to a serving cell and a second RSRP value corresponding to a target cell, which are measured by the terminal UE; inserting corresponding penalty values into the first RSRP value and the second RSRP value respectively to obtain a third RSRP value corresponding to the serving cell and a fourth RSRP value corresponding to the target cell; and if the third RSRP value and the fourth RSRP value accord with the preset cell switching condition, switching the UE from the serving cell to the target cell. Therefore, when the terminal moves at a high speed between the serving cell and the target cell, the high-speed uploading and downloading speed can be kept, the probability of disconnection of the terminal is effectively reduced, the switching success rate of the terminal between the serving cell and the target cell is improved, and the user experience is further improved.

For the apparatus embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

Embodiments of the invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above detailed description is provided for a cell switching method and a base station, and a specific example is applied in the description to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A cell switching method, which is applied to a base station, is characterized in that the method comprises:

if the third RSRP value and the fourth RSRP value accord with a preset cell switching condition, switching the UE from the serving cell to the target cell;

before the step of receiving the first RSRP value corresponding to the serving cell and the second RSRP value corresponding to the target cell measured by the UE, the method further includes:

receiving a plurality of serving cell RSRP measurement values and a plurality of target cell RSRP measurement values measured by the UE;

determining a cut-out threshold corresponding to the serving cell and a cut-in threshold corresponding to the target cell according to the plurality of serving cell RSRP measurement values, the plurality of target cell RSRP measurement values and the preset cell switching condition;

sending the plurality of serving cell RSRP measurement values, the plurality of target cell RSRP measurement values, the cut-out threshold and the cut-in threshold to a management device, so that the management device calculates a first penalty value corresponding to the serving cell and a second penalty value corresponding to the target cell according to the plurality of serving cell RSRP measurement values, the plurality of target cell RSRP measurement values, the cut-out threshold and the cut-in threshold;

acquiring the first penalty value and the second penalty value from the management device side;

judging whether the third RSRP value and the fourth RSRP value meet the preset cell switching condition according to the following method, including:

and if so, judging that the third RSRP value and the fourth RSRP value accord with the preset cell switching condition.

2. The method of claim 1, wherein after the step of receiving the first RSRP value corresponding to the serving cell and the second RSRP value corresponding to the target cell measured by the user equipment UE, further comprising:

sending the first RSRP value and the second RSRP value to the management device to calculate, by the management device, a third penalty value corresponding to the serving cell and a fourth penalty value corresponding to the target cell;

3. The method of claim 2, further comprising:

inserting the third penalty value into a received fifth RSRP value measured by the UE and corresponding to the serving cell if the UE accesses the serving cell again; and the number of the first and second groups,

inserting the fourth penalty value into a received sixth RSRP value corresponding to the target cell measured by the UE.

4. A base station, comprising:

an inserting module, configured to insert corresponding penalty values into the first RSRP value and the second RSRP value, respectively, so as to obtain a third RSRP value corresponding to the serving cell and a fourth RSRP value corresponding to the target cell;

a switching module, configured to switch the UE from the serving cell to the target cell if the third RSRP value and the fourth RSRP value meet a preset cell switching condition;

wherein the base station further comprises:

a determining module, configured to determine, according to the RSRP measurement values of the multiple serving cells, the RSRP measurement values of the multiple target cells, and the preset cell handover condition, a cut-out threshold corresponding to the serving cell and a cut-in threshold corresponding to the target cell;

a sending module, configured to send the plurality of serving cell RSRP measurement values, the plurality of target cell RSRP measurement values, the cut-out threshold, and the cut-in threshold to a management device, so that the management device calculates a first penalty value corresponding to the serving cell and a second penalty value corresponding to the target cell according to the plurality of serving cell RSRP measurement values, the plurality of target cell RSRP measurement values, the cut-out threshold, and the cut-in threshold;

an obtaining module, configured to obtain the first penalty value and the second penalty value from the management device side;

the switching module judges whether the third RSRP value and the fourth RSRP value meet the preset cell switching condition according to the following method, including:

5. The base station of claim 4, wherein the sending module is further configured to send the first RSRP value and the second RSRP value to the management device to calculate, by the management device, a third penalty value corresponding to the serving cell and a fourth penalty value corresponding to the target cell;

6. The base station of claim 5, wherein the insertion module is further configured to: