WO2015027476A1

WO2015027476A1 - Network switching method, access point, controller and base station

Info

Publication number: WO2015027476A1
Application number: PCT/CN2013/082703
Authority: WO
Inventors: 邢平平; 张欢; 宋平
Original assignee: 华为技术有限公司
Priority date: 2013-08-30
Filing date: 2013-08-30
Publication date: 2015-03-05
Also published as: CN104641685A; CN104641685B

Abstract

Provided in an embodiment of the present invention are a network switching method, access point, controller and base station, the network switching method comprising: a first network access point acquires transmission delay reference information from a user equipment (UE) to be switched to a second network access point, the transmission delay reference information being used to determine transmission delay information between the UE to be switched to the second network access point; and the first network access point transmits to a second network controller a switching request containing the transmission delay reference information, the switching request being used to instruct the second network controller to transmit the transmission delay information to the second network access point, and to control the second network access point to conduct network switching synchronization with the UE to be switched. The embodiment of the present invention improves network switching efficiency, and solves the problem of long network interruption delay during network switching for a UE.

Description

Network switching method, access point, controller and base station

Technical field

The embodiments of the present invention relate to communication technologies, and in particular, to a network handover method, an access point, a controller, and a base station. Background technique

With the rapid development of Long Term Evolution (LTE), under the 3rd Generation Partnership Project (3GPP), there is Global System for Mobile Communications (GSM). ) How to implement switching between networks, such as the Universal Mobile Telecommunications System (UMTS) and LTE networks, especially the handover from LTE cells to UMTS cells becomes more important.

In the handover process from the LTE cell to the UMTS cell, the existing handover procedure is: the source evolved base station (Evolved Node B, referred to as the source eNB) passes the LTE and UMTS core network nodes to the target radio network controller (Radio Network Controller, referred to as The RNC sends a handover request to the source eNB after receiving the handover request. After receiving the handover request response message, the source eNB sends a handover command to the user equipment (User Equipment, UE for short), and the UE receives the handover command. After the handover command, downlink synchronization is performed on the downlink dedicated physical control channel (DPCCH). After the downlink synchronization is completed, the UE sends an uplink signal on the uplink DPCCH, and the target NodeB searches for the uplink sent by the UE in a certain search window. The signal is forwarded and the uplink synchronization is performed. After the synchronization is completed, the UE sends a handover complete message to the target RNC, so as to implement handover of the UE from the LTE cell to the UMTS cell.

However, in the foregoing prior art, when there are a large number of UEs requiring handover from the LTE cell to the UMTS cell during uplink synchronization, multiple UEs to be switched may cause a large interruption delay when performing uplink synchronization with the target NodeB. . Summary of the invention

Embodiments of the present invention provide a network switching method, an access point, a controller, and a base station, to solve The problem that the network handover delay is large when there are a large number of UEs requiring handover from the LTE cell to the UMTS cell, so as to achieve efficient UE handover from the LTE cell to the UMTS cell network.

A first aspect of the present invention provides a network switching method, including:

Obtaining, by the first network access point, the transmission delay reference information of the user equipment UE to be switched to the second network access point, where the transmission delay reference information is used to determine between the UE to be switched and the second network access point Transmission delay information;

The first network access point sends a handover request including the transmission delay reference information to the second network controller, where the handover request is used to instruct the second network controller to send to the second network access point Transmitting delay information, controlling the second network access point to perform network switching synchronization with the to-be-switched UE.

In a first possible implementation manner of the first aspect, the first network access point is a source evolved base station eNB, the second network access point is a target base station NodeB, and the second network controller is Target Radio Network Controller RNC.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the transmission delay information is used by the target NodeB to determine a search window size for uplink synchronization in a network handover process. .

In conjunction with the first or second possible implementation of the first aspect, in a third possible implementation manner of the first aspect, if the target NodeB is co-located with the source eNB, the first network The access point obtains the transmission delay reference information of the UE to be switched, and includes:

The source eNB acquires a time advance TA value between the to-be-switched UE and the source eNB, and uses the TA value as the transmission delay reference information; or

The source eNB acquires a TA value between the to-be-switched UE and the source eNB, and converts the TA value to a transmission delay PD value of the universal mobile communication system UMTS, and uses the PD value as the transmission delay reference. information.

With reference to the first or the second possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, if the target NodeB is not co-station with the source eNB, the first The network access point obtains the transmission delay reference information of the UE to be switched, and includes:

The source eNB acquires location information of the to-be-switched UE, and uses location information of the to-be-switched UE as the transmission delay reference information.

In combination with the first or second possible implementation of the first aspect, the fifth in the first aspect In a possible implementation, if the target NodeB is not co-located with the source eNB, the first network access point acquires the transmission delay reference information of the UE to be switched, and includes:

The source eNB acquires location information of the to-be-switched UE and location information of the target NodeB;

The source eNB calculates a PD value between the to-be-switched UE and the target NodeB according to the location information of the to-be-switched UE and the location information of the target NodeB, where the to-be-switched UE and the target NodeB are The inter-PD value is used as the transmission delay reference information.

With reference to any one of the first to fifth possible implementations of the first aspect, in a sixth possible implementation manner of the first aspect, the first network access point is sent to the second network controller, including After the transmission delay reference information switching request, the method further includes:

And the source eNB sends the network handover indication information to the to-be-switched UE according to the received handover request response sent by the target RNC, where the network handover indication information is used to indicate that the to-be-switched UE performs network handover.

A second aspect of the present invention provides a network switching method, including:

Receiving, by the second network controller, a handover request that is sent by the first network access point, including the transmission delay reference information;

Determining, by the second network controller, transmission delay information between the user equipment UE to be switched and the second network access point according to the transmission delay reference information;

The second network controller sends a radio link setup request including the transmission delay information to the second network access point, where the radio link setup request is used to indicate the second network access point and location It is stated that the handover UE performs network handover synchronization.

In a first possible implementation manner of the second aspect, the first network access point is a source evolved base station eNB, the second network access point is a target base station NodeB, and the second network controller is Target Radio Network Controller RNC.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the transmission delay information is used by the target NodeB to determine a search window size of an uplink signal during a network handover process. .

With reference to the first or second possible implementation of the second aspect, in a third possible implementation manner of the second aspect, the transmission delay reference information is between the to-be-switched UE and the source eNB The time advances the TA value, and the second network controller participates according to the transmission delay Determining the transmission delay information between the UE to be switched and the second network access point, the method includes: converting, by the target RNC, the TA value to a transmission delay PD value of the universal mobile communication system UMTS, and using the PD value as The transmission delay information.

With reference to the first or second possible implementation of the second aspect, in a fourth possible implementation manner of the second aspect, the transmission delay reference information is location information of the to-be-switched UE, And determining, by the second network controller, the transmission delay information between the UE to be switched and the second network access point according to the transmission delay reference information, including:

The target RNC acquires location information of the target NodeB;

The target RNC calculates a PD value between the to-be-switched UE and the target NodeB according to the location information of the to-be-switched UE and the location information of the target NodeB, and the to-be-switched UE and the target NodeB The inter-PD value is used as the transmission delay information.

With reference to the first to fourth possible implementation manners of the second aspect, in a fifth possible implementation manner of the second aspect, the second network controller receives the transmission delay that is sent by the first network access point After the switching request of the reference information, it also includes:

The target RNC sends a handover request response to the source eNB.

A third aspect of the present invention provides a first network access point, including:

An acquiring module, configured to obtain transmission delay reference information of the UE to be switched to the second network access point, where the transmission delay reference information is used to determine between the UE to be switched and the second network access point Transmission delay information;

a first sending module, configured to send, to the second network controller, a handover request including the transmission delay reference information, where the handover request is used to instruct the second network controller to send a transmission to the second network access point Delaying information, controlling the second network access point to perform network switching synchronization with the to-be-switched UE.

In a first possible implementation manner of the third aspect, the first network access point is a source evolved base station eNB, the second network access point is a target base station NodeB, and the second network controller is Target Radio Network Controller RNC.

In conjunction with the first possible implementation of the third aspect, in a second possible implementation manner of the third aspect, the transmission delay information is used by the target NodeB to determine a search window size for uplink synchronization in a network handover process.

Combining the first or second possible implementation of the third aspect, the third of the third aspect In a possible implementation manner, the acquiring module is specifically configured to: if the target NodeB is co-located with the source eNB, acquire a time advance TA value between the to-be-switched UE and the source eNB, where The TA value is used as the transmission delay reference information; or, the TA value between the UE to be switched and the source eNB is obtained, and the TA value is converted to a transmission delay PD value of the universal mobile communication system UMTS, and the The PD value is used as the transmission delay reference information.

With reference to the first or second possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the acquiring module is specifically configured to: if the target NodeB is not co-shared with the source eNB And obtaining the location information of the to-be-switched UE, and using the location information of the to-be-switched UE as the transmission delay reference information.

With reference to the first or second possible implementation manner of the third aspect, in a fifth possible implementation manner of the third aspect, the acquiring module is specifically configured to: if the target NodeB is not co-shared with the source eNB a station, the location information of the to-be-switched UE and the location information of the target NodeB are obtained; and the to-be-switched UE and the target NodeB are calculated according to the location information of the to-be-switched UE and the location information of the target NodeB. The PD value between the UE to be switched and the target NodeB is used as the transmission delay reference information.

According to a fourth aspect of the present invention, a second network controller is provided, including:

a receiving module, configured to receive, by the first network access point, a handover request that includes transmission delay reference information;

a processing module, configured to determine, according to the transmission delay reference information, transmission delay information between the user equipment UE to be switched and the second network access point;

a second sending module, configured to send, to the second network access point, a radio link setup request that includes the transmission delay information, where the radio link setup request is used to indicate the second network access point and location It is stated that the handover UE performs network handover synchronization.

In a first possible implementation manner of the fourth aspect, the first network access point is a source evolved base station eNB, the second network access point is a target base station NodeB, and the second network controller is Target Radio Network Controller RNC.

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the transmission delay information is used by the target NodeB to determine a uplink synchronization search during a network handover uplink synchronization process Window size.

Combining the first or second possible implementation of the fourth aspect, the third in the fourth aspect In a possible implementation manner, the processing module is specifically configured to: when the transmission delay reference information is a time advance TA value between the to-be-switched UE and the source eNB, convert the TA value into a universal mobile The transmission delay UMTS of the communication system UMTS uses the PD value as the transmission delay information.

With reference to the first or second possible implementation manner of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the processing module is specifically configured to: the transmission delay reference information is the to-be-switched The location information of the UE is obtained, the location information of the target NodeB is obtained, and the PD value between the to-be-switched UE and the target NodeB is calculated according to the location information of the to-be-switched UE and the location information of the target NodeB, and The PD value between the UE to be switched and the target NodeB is used as the transmission delay information.

According to a fifth aspect of the present invention, a base station is provided, comprising: a transmitter, a receiver, a memory, and a processor respectively connected to the transmitter, the receiver, and the memory, wherein the memory is stored A set of program code, and the processor is configured to invoke program code stored in the memory to perform any one of the first to sixth possible implementations of the first aspect of the invention and the first aspect.

According to a sixth aspect of the present invention, a network controller is provided, including: a transmitter, a receiver, a memory, and a processor respectively connected to the transmitter, the receiver, and the memory, wherein the memory Storing a set of program code, and the processor is configured to invoke program code stored in the memory, and perform any one of the first to fifth possible implementations of the second aspect and the second aspect of the present invention .

The technical solution provided by the embodiments of the present invention, when the first network access point sends a handover request to the second network controller, carries the transmission delay reference information, where the second network controller sends the second network controller to the second network access point. The transmission delay information controls the second network access point to determine the search window size according to the transmission delay information, thereby improving the efficiency of the network handover and solving the problem that the UE has a large network interruption time during network handover. 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, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. The drawings are some embodiments of the invention, and to those of ordinary skill in the art, Other drawings may also be obtained from these drawings without the inventive labor.

1 is a flowchart of a network switching method according to an embodiment of the present invention;

2 is a flowchart of a network switching method according to another embodiment of the present invention;

3 is a signaling flowchart of a network switching method according to still another embodiment of the present invention;

4 is a schematic structural diagram of a first network access point according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a second network controller according to an embodiment of the present invention; FIG.

6 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a network controller 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. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

1 is a flowchart of a network handover method according to an embodiment of the present invention. The method can be applied to network handover between standard network networks under the 3GPP specifications, in particular, network handover from an LTE cell to a UMTS cell, and the method can be applied to The case of multimode base stations and non-multimode base stations. The method may be implemented by a first network access point switched by a network, where the first network access point may be a source base station switched in various standard networks under the 3GPP specifications. As shown in FIG. 1 , the source eNB in the LTE network is used as the first network access point, the target eNB based on the UMTS is used as the second network access point, and the target RNC is used as the second network controller. Note that the method can be performed as follows:

S101. The first network access point acquires transmission delay reference information of the UE to be switched to the second network access point, where the transmission delay reference information is used to determine a transmission delay between the UE to be switched and the second network access point. information.

In the case where a plurality of standard network cells coexist, the UE's camping strategy is to preferentially camp on the high-standard system. Therefore, when a UMTS cell and an LTE cell coexist, a large number of UEs camping on the LTE cell may cause a high load on the LTE cell. It is inevitable that a large number of LTE cell-to-UMTS cell load-based network switching will occur, and Circuit Switched Fallback (CSFB) will be dropped. It is also a factor that triggers the LTE cell to UMTS cell network handover. The interruption delay in the network handover is a major factor affecting the user experience. Therefore, in the case where there are a large number of LTE cell to UMTS cell handovers, in order to not affect the user experience, the handover interruption of the LTE cell to the UMTS cell should be shortened as much as possible. Delay.

After the UE accesses the LTE cell, the UE performs related system measurement according to the measurement configuration. When the UMTS neighboring cell of the different system meets certain conditions, the UE reports a different system measurement report including the UMTS neighboring cell to the eNB of the cell to which the cell belongs. The source eNB may use the received measurement report as the transmission delay reference information of the UE to be switched and the target NodeB, or may perform the processing report as the transmission delay reference information after certain processing.

The transmission delay reference information may be used to determine transmission delay information between the UE to be switched and the target NodeB. Further, the transmission delay information can be used for the target NodeB to determine the size of the search window for uplink synchronization during the network handover.

Optionally, if the target NodeB is co-located with the source eNB, the S101 may include: the source eNB acquires a Timing Advance (TA) value between the UE to be switched and the source eNB, and the TA value is used. As the transmission delay reference information. Specifically, in the LTE standard network, uplink synchronization signals of different UEs are time aligned when they arrive at the eNB, so as to ensure orthogonality of uplink signals between UEs, thereby helping to eliminate interference in the cell. The signal is delayed in spatial transmission. If the UE moves in a direction away from the eNB during the call, the signal sent from the eNB will arrive at the UE "later and later", and at the same time, the signal of the UE will "go." The later the " arrives at the eNB, the delay is too long, which causes the signal received by the eNB on the time slot to overlap with the time slot of the eNB receiving the next other UE signal, causing inter-symbol interference. The time alignment of the uplink transmission is implemented by applying the TA value to the transmitting side of the UE. That is, the main purpose of the TA value is to eliminate different transmission delays between the UEs, and the UE adjusts the transmission time according to the TA value when performing uplink transmission. The TA value can be obtained through a Random Access Channel (RACH). In the handover process, the access target NodeB also obtains the TA value and subsequent uplink transmission resources through the RACH.

When the UE is in the UMTS cell, the transmission delay of the UE to be switched to the target NodeB, that is, the parameter PD value, may be obtained through the RACH procedure, and the accuracy is 3 chip, that is, 0.78us, according to the protocol, and the TA acquired by the RACH process in the LTE cell The value has an accuracy of 0.52us, so the accuracy of the two parameters is on the same order of magnitude. In the case of the eNB and the NodeB co-site or the common antenna, the distance from the UE to the eNB and the UE to the NodeB is the same, that is, the same signal transmission Delay, so this kind of situation In this case, the TA value in the LTE cell can be used as the PD value of the UMTS cell.

Further, if the target NodeB is co-located with the source eNB, the S101 may further include: the source eNB acquiring a TA value between the to-be-switched UE and the source eNB, and converting the TA value to a PD value of the UMTS, The PD value is used as the transmission delay reference information. Specifically, since the TA value and the PD belong to two different standard networks, the unit of measurement is different. In order to facilitate the target NodeB to use the parameter to determine the search window size of the uplink synchronization search, the unit of measurement may be changed.

Optionally, if the target NodeB is not co-located with the source eNB, the S101 may include: the source eNB acquiring the location information of the to-be-switched UE, and using the location information of the to-be-switched UE as the transmission delay reference information. Specifically, when the target NodeB and the source eNB are non-co-located, the transmission delay of the UE to the eNB is different from the transmission delay of the UE to the NodeB, and the TA information cannot be directly used. In this case, the UE to be switched can be used. The location information is used as the transmission delay reference information, and the location information of the to-be-switched UE is sent to the target RNC, and the transmission delay of the to-be-switched UE and the target NodeB may be calculated by the target RNC.

The source eNB may obtain the Global Position System (GPS) method, the Observed Time Difference of Arrival (OTDOA) method, and the Cell Identity (CellllD). The method and the like are used to obtain the coordinate information of the UE to be switched, and no limitation is imposed here.

Further, if the target NodeB is not co-located with the source eNB, the S101 may further include: the source eNB acquiring the location information of the to-be-switched UE and the location information of the target NodeB; the source eNB according to the location information of the to-be-switched UE The location information of the target NodeB is used to calculate a PD value between the UE to be switched and the target NodeB, and the PD value between the UE to be switched and the target NodeB is used as the transmission delay reference information.

Specifically, the location information of the target NodeB may be directly obtained by using the location information stored in the neighboring area of the source eNB, or may be obtained by querying the configuration database, but not limited thereto. For example, the calculation of the PD value between the UE to be switched and the target NodeB may be: calculating the distance between the target NodeB and the UE to be switched according to the coordinate information of the UE to be switched and the target NodeB, and then The distance value is divided by the speed of light to calculate the PD value of the UE to be switched to the target NodeB.

S102. The first network access point sends, to the second network controller, a handover request that includes the transmission delay reference information, where the handover request is used to indicate that the second network controller accesses the second network. The point sends the transmission delay information, and controls the second network access point to perform network switching synchronization with the to-be-switched UE.

Specifically, when the source eNB sends a handover request to the target RNC, the transmission delay reference information is carried in the handover request and sent to the target RNC, so that the target RNC sends the reference information to the target NodeB according to the handover request and the transmission delay reference information. Send a wireless link setup request. The radio link setup request carries transmission delay information, and according to the transmission delay information, the target NodeB can determine the search window size, thereby improving network handover efficiency.

Optionally, after the step S102, the method of the present implementation may further include: the source eNB sending network handover indication information to the to-be-switched UE according to the received handover request response sent by the target RNC, where the network handover indication information is used. Instructing the to-be-switched UE to perform network handover.

In this embodiment, the first network access point carries the transmission delay reference information in the sending the handover request to the second network controller, and is used to instruct the second network controller to send the transmission delay information to the second network access point, thereby The second network access point is controlled to determine the size of the search window according to the transmission delay information, thereby improving the efficiency of network switching, and solving the problem that the network is delayed when the network is switched.

The current UE handover from the LTE cell to the UMTS cell may adopt a posteriori handover, that is,

When the UE accesses the target UMTS cell after receiving the handover command, it considers that the downlink is synchronous, and performs uplink synchronization directly on the uplink DPCCH. At this time, the main delay is derived from the uplink signal search for the uplink synchronization on the target NodeB side. The search window is related to the cell radius when the target NodeB side does not know the value of the Propagation Delay (PD). For example, the uplink synchronization search window used when the cell radius is 20 km uses 512 chips, and the PD value is known. The lower search window generally uses 40-50 chips, that is, if the PD value is known, the target NodeB can reduce the search space and save the NodeB processing resources. However, in the network handover process from the actual LTE cell to the UMTS cell, more search resources are needed because the PD value cannot be obtained, and in the case where the resource is limited, multiple handover UEs need to be queued, and the queue waiting time leads to synchronization. The delay is increased, especially in the case of frequent LTE cell to UMTS cell network handover, the queue time is long, and the delay is large, which causes the entire handover interruption delay to be too long and seriously affects the user experience. In order to solve these problems, the network switching delay can be reduced by the method provided by the above embodiment.

2 is a flowchart of a network switching method according to another embodiment of the present invention, and the method may be implemented by a second network controller. In this embodiment, the source eNB is used as the first network access point, the target NodeB is used as the second network access point, and the target RNC is used as the second network controller as an example. As shown in 2, the method can be performed as follows:

S201. The second network controller receives a handover request that is sent by the first network access point and includes the transmission delay reference information.

Optionally, after S201, the method further includes: sending, by the target RNC, a handover request response to the source eNB. Specifically, after receiving the handover request of the source eNB, the target RNC performs the admission and related resource preparation, and sends a handover request response to the source eNB to notify the source eNB that the network handover can be performed, so that the source eNB can The UE issues handover indication information.

S202. The second network controller determines, according to the transmission delay reference information, transmission delay information between the UE to be switched and the second network access point.

Optionally, the transmission delay information may be used by the target NodeB to determine an uplink signal search window size during network handover.

Optionally, if the transmission delay reference information is a TA value between the UE to be switched and the source eNB, the S202 may include: the target RNC transforms the TA value into a PD value of the UMTS, where the PD value is used as the Transfer delay information. Specifically, when the source eNB determines that it is co-located with the target NodeB, the transmission delay reference information sent to the target RNC is the TA value between the UE to be switched and the source eNB, and the target RNC passes the received TA value through the measurement unit. The PD value converted to the UMTS network standard is used as the transmission delay information between the UE to be switched and the second network access point.

Further, if the received transmission delay reference information is a PD value, the transmission delay reference information is directly used as the transmission delay information.

Optionally, if the received transmission delay reference information is location information of the to-be-switched UE,

S202 can include:

The target RNC obtains location information of the target NodeB;

The target RNC calculates a PD value between the to-be-switched UE and the target NodeB according to the location information of the to-be-switched UE and the location information of the target NodeB, and uses the PD value between the UE to be switched and the target NodeB as the transmission. Delayed information.

Specifically, the location information of the target NodeB may be directly obtained through the configuration information stored locally by the RNC, or the location information of the neighboring area may be obtained by querying the configuration database, but not limited thereto. The obtaining of the PD value between the UE to be switched and the target NodeB may be obtained according to the foregoing method, and details are not described herein again.

S203. The second network controller sends the transmission delay information to the second network access point. The radio link setup request is used to indicate that the second network access point performs network handover synchronization with the to-be-switched UE.

Specifically, the target RNC sends a radio link setup request to the target NodeB, indicating that the target NodeB and the to-be-switched UE perform network access process synchronization, and in particular, the target indication information may further include the transmission delay information. The target NodeB can determine the search window size according to the transmission delay information, thereby improving network switching efficiency.

In this embodiment, the second network controller determines the transmission delay information according to the received transmission delay reference information, and carries the transmission delay information in the radio link setup request and sends the information to the second network access point to enable the second network access. The point determines the search window size according to the transmission delay information, thereby improving the efficiency of the network handover, and solving the problem that the network interruption time is large when the UE switches in the network.

FIG. 3 is a signaling flowchart of a network switching method according to still another embodiment of the present invention. As shown in FIG. 4, the method may be performed according to the following process:

S301. The UE to be switched sends a different system measurement report to the source eNB.

Specifically, the different system measurement report may include: information about signal quality of the source cell and the target neighboring cell.

S302: The source eNB acquires transmission delay reference information of the UE to be switched.

5303. The source eNB sends a handover request to the target RNC.

Specifically, the handover request carries the transmission delay reference information.

5304. The target RNC sends a handover request response to the source eNB.

Specifically, in this step, the target RNC needs to prepare related resources according to the received handover request.

S305. The source eNB sends handover indication information to the UE to be handed over.

5306. The target RNC sends a radio link setup request to the target NodeB.

In this step, the radio link setup request carries the transmission delay information to guide the target NodeB to determine the search window.

Alternatively, S306 may be performed before S304, and no limitation is imposed here.

5307. The UE to be switched sends an uplink signal to the target NodeB.

Before the step, the UE to be switched may further perform downlink synchronization with the target NodeB.

5308. The target NodeB determines a search window size according to the transmission delay information in the radio link setup request, and searches for an uplink signal within the specified search window to perform uplink synchronization. In this step, the radio link setup request carries the transmission delay information, and the target NodeB can determine the search window size according to the transmission delay information, reduce the search range, and then search for the uplink signal in the determined search range to perform uplink synchronization.

It should be emphasized that there is no timing relationship between S307 and S308, that is, the execution order of S307 and S308 is not fixed, and this embodiment is merely an example.

FIG. 4 is a schematic structural diagram of a first network access point according to an embodiment of the present invention. As shown in FIG. 4, the first network access point may include: an obtaining module 41 and a first sending module 42. The obtaining module 41 may be configured to obtain transmission delay reference information of the UE to be switched to the second network access point, where the transmission delay reference information is used to determine the transmission between the UE to be switched and the second network access point. Delaying information; the first sending module 42 may be configured to send, to the second network controller, a handover request including the transmission delay reference information, where the handover request is used to indicate the second network controller to the second network access point Sending transmission delay information, and controlling the second network access point to perform network switching synchronization with the to-be-switched UE.

Optionally, the first network access point may be a source eNB, the second network access point may be a target NodeB, and the second network controller may be a target RNC.

Optionally, the transmission delay information may be used by the target NodeB to determine a search window size for uplink synchronization during network handover.

Optionally, the acquiring module 41 is specifically configured to: if the target NodeB is co-located with the source eNB, acquire a TA value between the to-be-switched UE and the source eNB, and use the TA value as the transmission delay reference information. Or acquiring the TA value between the UE to be switched and the source eNB, and transforming the value of the PD to the PD value of the UMTS, and using the PD value as the transmission delay reference information.

Optionally, the acquiring module 41 is specifically configured to: if the target NodeB is not co-station with the source eNB, obtain location information of the to-be-switched UE, and use the location information of the to-be-switched UE as the transmission delay reference information.

Optionally, the acquiring module 41 is specifically configured to: if the target NodeB is not co-station with the source eNB, acquire location information of the to-be-switched UE and location information of the target NodeB; according to location information of the to-be-switched UE And calculating, by using the location information of the target NodeB, a PD value between the UE to be switched and the target NodeB, and using a PD value between the UE to be switched and the target NodeB as the transmission delay reference information.

The device of this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. For details of the specific functions, refer to the foregoing method embodiments, and details are not described herein again.

FIG. 5 is a schematic structural diagram of a second network controller according to an embodiment of the present invention. As shown in FIG. 5, the second network controller may include: a receiving module 51, a processing module 52, and a second sending module 53. The receiving module 51 may be configured to receive a handover request that includes a transmission delay reference information that is sent by the first network access point, where the processing module 52 is configured to determine, according to the transmission delay reference information, the UE to be switched and the second network access. Transmission delay information between the points; the second sending module 53 may be configured to send, to the second network access point, a radio link setup request including the transmission delay information, where the radio link setup request is used to indicate the The second network access point performs network switching synchronization with the to-be-switched UE.

Optionally, the processing module 52 is specifically configured to: when the transmission delay reference information is a TA value between the UE to be switched and the source eNB, convert the TA value into a PD value of the UMTS, and use the PD value as the PD value. This transmission delay information.

Optionally, the processing module 52 is specifically configured to: when the transmission delay reference information is location information of the to-be-switched UE, obtain location information of the target NodeB, according to the location information of the to-be-switched UE and the location of the target NodeB. The information is used to calculate a PD value between the UE to be switched and the target NodeB, and the PD value between the UE to be switched and the target NodeB is used as the transmission delay information.

The device in this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 2, and the specific functions are described in the foregoing method embodiments, and details are not described herein again.

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 6, the base station may include: a transmitter 61, a receiver 62, a memory 63, and the transmitter 61, the receiver 62, and the memory 63, respectively. a connected processor 64, wherein the memory 63 stores a set of program codes, and the processor 64 is configured to call the program code stored in the memory 63, and the technical solution of the method embodiment shown in FIG. 1 can be executed. For details of the specific functions, refer to the foregoing method embodiments, and details are not described herein again.

FIG. 7 is a schematic structural diagram of a network controller according to an embodiment of the present invention, as shown in FIG. The controller may include: a transmitter 71, a receiver 72, a memory 73, and a processor 74 connected to the transmitter 71, the receiver 72, and the memory 73, respectively, wherein the memory 73 stores a set of program codes, and The processor 74 is used to invoke the program code stored in the memory 73, and the technical solution of the method embodiment shown in FIG. 2 can be executed. For the specific functions, refer to the foregoing method embodiment, and details are not described herein again.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the method of various embodiments of the present invention. Part of the steps. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

A person skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of each functional module described above is exemplified. In practical applications, the above function assignment can be completed by different functional modules as needed, that is, the device is installed. The internal structure is divided into different functional modules to perform all or part of the functions described above. For the specific working process of the device described above, refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

Finally, it should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting thereof; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

claims

1. A network switching method, characterized by including:

The first network access point obtains transmission delay reference information from the user equipment UE to be switched to the second network access point. The transmission delay reference information is used to determine the relationship between the UE to be switched and the second network access point. transmission delay information;

The first network access point sends a switching request including the transmission delay reference information to the second network controller, where the switching request is used to instruct the second network controller to send a switching request to the second network access point. Transmit delay information, and control the second network access point to perform network switching synchronization with the UE to be switched.

2. The method according to claim 1, characterized in that, the first network access point is a source evolved base station eNB, the second network access point is a target base station NodeB, and the second network controller is the target radio network controller RNC.

3. The method according to claim 2, characterized in that the transmission delay information is used for the target NodeB to determine the search window size for uplink synchronization during network switching.

4. The method according to claim 2 or 3, characterized in that if the target NodeB and the source eNB are co-sited, the first network access point obtains the transmission delay reference information of the UE to be switched, including :

The source eNB obtains the time advance TA value between the UE to be switched and the source eNB, and uses the TA value as the transmission delay reference information; or,

The source eNB obtains the TA value between the UE to be switched and the source eNB, converts the TA value into a transmission delay PD value of the Universal Mobile Communications System UMTS, and uses the PD value as the transmission delay reference information.

5. The method according to claim 2 or 3, characterized in that if the target NodeB and the source eNB are not co-located, the first network access point obtains the transmission delay reference information of the UE to be switched, include:

The source eNB obtains the location information of the UE to be switched, and uses the location information of the UE to be switched as the transmission delay reference information.

6. The method according to claim 2 or 3, characterized in that if the target NodeB and the source eNB are not co-sited, the first network access point obtains the transmission delay reference information of the UE to be switched, include: The source eNB obtains the location information of the UE to be switched and the location information of the target NodeB;

The source eNB calculates the PD value between the UE to be switched and the target NodeB based on the location information of the UE to be switched and the location information of the target NodeB, and divides the PD value between the UE to be switched and the target NodeB. The PD value between is used as the transmission delay reference information.

7. The method according to any one of claims 2 to 6, characterized in that, after the first network access point sends a handover request including the transmission delay reference information to the second network controller, it further includes:

The source eNB sends network switching indication information to the UE to be switched according to the received switching request response sent by the target RNC, and the network switching indication information is used to instruct the UE to be switched to perform network switching.

8. A network switching method, characterized by including:

The second network controller receives a handover request including transmission delay reference information sent by the first network access point;

The second network controller determines the transmission delay information between the user equipment UE to be switched and the second network access point according to the transmission delay reference information;

The second network controller sends a wireless link establishment request including the transmission delay information to the second network access point, where the wireless link establishment request is used to instruct the second network access point to communicate with the second network access point. The UE to be switched performs network switching synchronization.

9. The method according to claim 8, characterized in that: the first network access point is a source evolved base station eNB, the second network access point is a target base station NodeB, and the second network controller is the target radio network controller RNC.

10. The method according to claim 9, characterized in that the transmission delay information is used for the target NodeB to determine the search window size of the uplink signal during the network switching process.

11. The method according to claim 9 or 10, wherein the transmission delay reference information is a time advance TA value between the UE to be switched and the source eNB, then the second network controller Determining the transmission delay information between the UE to be switched and the second network access point according to the transmission delay reference information includes:

The target RNC converts the TA value into a transmission delay PD value of the universal mobile communication system UMTS, and uses the PD value as the transmission delay information.

12. The method according to claim 9 or 10, wherein the transmission delay reference information is the location information of the UE to be switched, and the second network controller determines the location information of the UE to be switched based on the transmission delay reference information. The transmission delay information between the handover UE and the second network access point includes:

The target RNC obtains the location information of the target NodeB;

The target RNC calculates the PD value between the UE to be switched and the target NodeB based on the location information of the UE to be switched and the location information of the target NodeB, and calculates the PD value between the UE to be switched and the target NodeB. The PD value between is used as the transmission delay information.

13. The method according to any one of claims 9 to 12, characterized in that, after the second network controller receives the handover request including the transmission delay reference information sent by the first network access point, it further includes:

The target RNC sends a handover request response to the source eNB.

14. A first network access point, characterized by: including:

Obtaining module, configured to obtain transmission delay reference information from the user equipment UE to be switched to the second network access point, where the transmission delay reference information is used to determine the transmission delay between the UE to be switched and the second network access point. transmission delay information;

A first sending module, configured to send a switching request including the transmission delay reference information to a second network controller, where the switching request is used to instruct the second network controller to send a transmission to the second network access point. The delay information controls the network switching synchronization between the second network access point and the UE to be switched.

15. The access point according to claim 14, characterized in that: the first network access point is a source evolved base station eNB, the second network access point is a target base station NodeB, and the second network access point is a target base station NodeB. The controller is the target radio network controller RNC.

16. The access point according to claim 15, wherein the transmission delay information is used for the target NodeB to determine the search window size for uplink synchronization during network switching.

17. The access point according to claim 15 or 16, characterized in that the acquisition module is specifically configured to: if the target NodeB and the source eNB are co-sited, acquire the UE to be switched and the source eNB. The time between source eNBs is advanced by a TA value, and the TA value is used as the transmission delay reference information; or, the TA value between the UE to be switched and the source eNB is obtained, and the TA value is converted into a universal The transmission delay PD value of mobile communication system UMTS, the PD value as the transmission delay reference information.

18. The access point according to claim 15 or 16, characterized in that the acquisition module is specifically configured to: if the target NodeB and the source eNB are not co-located, acquire the location of the UE to be switched. information, and use the location information of the UE to be switched as the transmission delay reference information.

19. The access point according to claim 15 or 16, characterized in that the acquisition module is specifically configured to: if the target NodeB and the source eNB are not co-located, acquire the location of the UE to be switched. information and the location information of the target NodeB; calculate the PD value between the UE to be switched and the target NodeB according to the location information of the UE to be switched and the location information of the target NodeB, and divide the UE to be switched The PD value between the target NodeB and the target NodeB is used as the transmission delay reference information.

20. A second network controller, characterized in that it includes:

A receiving module, configured to receive a handover request including transmission delay reference information sent by the first network access point;

A processing module configured to determine the transmission delay information between the user equipment UE to be switched and the second network access point according to the transmission delay reference information;

A second sending module, configured to send a wireless link establishment request including the transmission delay information to the second network access point, where the wireless link establishment request is used to indicate that the second network access point communicates with the second network access point. The UE to be switched performs network switching synchronization.

21. The controller according to claim 20, characterized in that: the first network access point is a source evolved base station eNB, the second network access point is a target base station NodeB, and the second network control point The controller is the target radio network controller RNC.

22. The controller according to claim 21, wherein the transmission delay information is used for the target NodeB to determine the search window size for uplink synchronization during the uplink synchronization process of network switching.

23. The controller according to claim 21 or 22, wherein the processing module is specifically configured to: the transmission delay reference information is a time advance TA value between the UE to be switched and the source eNB. , then the TA value is converted into a transmission delay PD value of the universal mobile communication system UMTS, and the PD value is used as the transmission delay information.

24. The controller according to claim 21 or 22, characterized in that the processing module The block is specifically configured to: if the transmission delay reference information is the location information of the UE to be switched, obtain the location information of the target NodeB, and calculate the location information of the target NodeB according to the location information of the UE to be switched and the location information of the target NodeB. The PD value between the UE to be switched and the target NodeB is used as the transmission delay information.

25. A base station, characterized in that it includes: a transmitter, a receiver, a memory, and a processor connected to the transmitter, the receiver, and the memory respectively, wherein a set of programs is stored in the memory code, and the processor is configured to call the program code stored in the memory to execute the method according to any one of claims 1 to 7.

26. A network controller, characterized in that it includes: a transmitter, a receiver, a memory, and a processor connected to the transmitter, the receiver and the memory respectively, wherein the memory stores a A set of program codes, and the processor is configured to call the program code stored in the memory to execute the method according to any one of claims 8 to 13.