WO2017012291A1

WO2017012291A1 - Hard handover method and apparatus, and storage medium

Info

Publication number: WO2017012291A1
Application number: PCT/CN2016/070088
Authority: WO
Inventors: 陈子福
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-07-22
Filing date: 2016-01-04
Publication date: 2017-01-26
Also published as: CN106358250A

Abstract

The present invention provides a hard handover method and apparatus, and a storage medium. The hard handover method comprises: receiving a handover request message sent by a source cell (S101); determining whether the handover request message comprises extension information of a dedicated signature (S102); and in a case in which the determining result is yes, accessing a destination cell by using the dedicated signature, so as to implement a handover from the source cell to the destination cell (S103). By means of the solution of the present invention, a destination cell can be randomly accessed by using a dedicated signature, and a collision with a common signature can be avoided, thereby improving the efficiency and the success probability of hard handovers, and reducing call drops generated due to handover failures.

Description

Hard switching method and device, storage medium

Technical field

The present invention relates to a hard handover technique, and in particular, to a hard handover method and apparatus, and a storage medium.

Background technique

Currently, there are two ways to switch within the TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system:

One is the traditional hard handover mode. After receiving the handover request message, the terminal needs to perform a random access again in the target cell, and can only switch to the target cell normally after obtaining the synchronization; however, the hard handover mode has the following Disadvantages, as the size of the user increases, the probability of collision caused by random access also increases, which may lead to random access failure, or successful after multiple random access, but the handover delay is large and affects perception;

The other is the relay switching mode. After receiving the handover request message, the terminal does not need to perform random access in the target cell, but directly calculates the synchronization adjustment of the target cell by using the SFN-SFN OTD (delay difference) measurement. The target cell is successfully accessed; however, the handover mode requires a high delay for the source cell and the target cell to be handed over. If the delay exceeds the standard, the handover fails easily.

Summary of the invention

The embodiment of the invention provides a method and a device for hard handover, and a storage medium, which can randomly access a target cell by using a dedicated signature, avoid collision with an ordinary signature, thereby improving the efficiency and success probability of the hard handover, and reducing the handover failure. The dropped call.

The invention provides a method for hard switching, comprising:

Receiving a handover request message sent by the source cell;

Determining whether the handover request message includes extension information specifying a dedicated signature;

If the determination result is yes, the dedicated cell is used to access the target cell to complete handover from the source cell to the target cell.

As an implementation manner, the method for hard handover further includes:

In a case where the handover request message does not include extension information specifying a dedicated signature, the target cell is randomly accessed using a normal signature.

As an implementation manner, the step of determining whether the handover request message includes the extended information specifying a dedicated signature further includes:

According to the handover request message, it is determined that the handover mode is a hard handover.

As an implementation manner, the handover request message is a radio bearer reconfiguration message, a physical channel reconfiguration message, or a transport channel reconfiguration message.

The invention also provides a device for hard switching, comprising:

a receiving module, configured to receive a handover request message sent by the source cell;

a determining module, configured to determine whether the switching request message includes extended information specifying a dedicated signature;

The first access module is configured to access the target cell by using the dedicated signature to complete the handover from the source cell to the target cell, if the determination result is yes.

As an implementation manner, the device for hard switching further includes:

The second access module is configured to randomly access the target cell by using a normal signature if the handover request message does not include the extension information specifying a dedicated signature.

As an implementation manner, the device for hard switching further includes:

The determining module is configured to determine, according to the handover request message, that the handover mode is a hard handover.

A storage medium having stored therein a computer program configured to perform the method of hard switching.

Through the above technical solutions of the present invention, the beneficial effects of the present invention are:

The hard handover method of the present invention receives the handover request message sent by the source cell, and determines whether the handover request message includes extension information specifying a dedicated signature. If the determination result is yes, the dedicated signature is used. Accessing the target cell to complete the handover from the source cell to the target cell can avoid collision with an ordinary signature, thereby improving the efficiency and success probability of hard handover, and reducing dropped calls caused by handover failure.

DRAWINGS

1 is a flow chart showing a method of hard handoff according to an embodiment of the present invention.

FIG. 2 shows a flow chart of the RNC selecting the hard handover mode of the UE.

3 is a flow chart showing a method of hard handoff in accordance with an embodiment of the present invention.

Figure 4 shows a detailed flow chart for completing a hard handoff using the present invention.

FIG. 5 is a block diagram showing the structure of a device for hard switching according to an embodiment of the present invention.

detailed description

The specific embodiments are described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , an embodiment of the present invention provides a hard handover method, which is applied to a user equipment UE. The method for hard handover according to the embodiment of the present invention includes the following steps:

S101: Receive a handover request message sent by the source cell.

S102: Determine whether the handover request message includes extension information that specifies a dedicated signature.

S103: If the determination result is yes, use the dedicated signature to access the target cell to complete handover from the source cell to the target cell.

The hard handover method of the embodiment of the present invention, by receiving a handover request message sent by the source cell, and determining whether the handover request message includes extension information specifying a dedicated signature, and if the determination result is yes, using the The dedicated signature accesses the target cell to complete the handover from the source cell to the target cell, which can avoid collision with the common signature, thereby improving the efficiency and success probability of the hard handover, and reducing the dropped call caused by the handover failure. .

In a practical application, when the UE accesses the source cell, the radio network controller RNC obtains the configuration of the UE, and determines whether the UE supports random access to the target cell by using a dedicated signature. Specifically, for example, in the 3GPP 25.331 protocol, in the message body UE CAPABILITY INFORMATION and the RRC CONNECTION SETUP COMPLETE, an extension field Capacity for HO_NCR is added in the UE radio access capability IE, and a Boolean type is used, which is equal to false. Not supported, but equal to ture stands for support. In addition, if the extended information field is not carried in the UE information obtained by the RNC, the UE is considered not to support accessing the target cell by using a dedicated signature.

When the UE does not support, if the UE reports a measurement report of a handover event (indicating that a handover from a source cell to a target cell is required), the RNC initiates a traditional hard handover mode, that is, the UE needs to pass a normal signature randomly. Access to the target cell.

When the UE supports the measurement report of the handover event, the RNC considers that the UE accesses the target cell by using a dedicated signature according to the interference situation of the current signature. Specifically, the RNC calculates the number of UEs that may initiate handover at the same time, and determines whether the UE is to be accessed to the target cell by using a dedicated signature. That is, when only the UE is initiating the handover at the time, the RNC allows the UE to access the target cell through a dedicated signature; if multiple UEs initiate handover at the same time, but supports the UE that accesses the target cell through the dedicated signature only When the UE does not support other UEs, the RNC may allow the UE to access the target cell through a dedicated signature; if multiple UEs initiate handover at the same time, but the UE that supports the target cell through the dedicated signature, in addition to the UE When there are other UEs, the RNC will select one of them. Or some supported UEs access the target cell through a dedicated signature, while for other UEs, the RNC initiates a traditional hard handover mode. It should be noted that, in an actual application, the number of UEs that can simultaneously initiate access to the target cell by using a dedicated signature is less than or equal to the configured number of dedicated signatures for handover.

The specific process can be seen in Figure 2, including the following steps:

S201: After the UE successfully accesses the source cell, the RNC acquires configuration information of the UE.

S202: Determine whether the UE supports accessing the target cell by using a dedicated signature, that is, determining whether Capacity for HO_NCR is equal to true;

S203: If not, the RNC initiates a traditional hard handover mode;

S204: If yes, the RNC considers allowing the UE to access the target cell by using a dedicated signature;

S205: Determine, according to the interference situation of the current signature, whether the UE is to access the target cell by using a dedicated signature.

S206: If not, the RNC initiates a traditional hard handover mode;

S207: If yes, the RNC allows the UE to access the target cell by using a dedicated signature.

Specifically, the handover request message sent by the source cell is sent by the RNC to the UE. The handover request message may be a radio bearer reconfiguration message (Radio Bearer Reconfiguration), a physical channel reconfiguration message (Physical Channel Reconfiguration), or a transport channel reconfiguration message (Transport Channel Reconfiguration), which is determined according to actual conditions, and the present invention does not Limited.

In order to implement the method for hard handover of the present invention, an uplink synchronization code is used, for example, an extension field (ie, extended information) SYNC_UL code for HO_NCR is added to the handover request message body, and the extension field is used. The UE is informed of its designated dedicated signature such that the UE completes the handover from the source cell to the target cell using the dedicated signature.

In the TD-SCDMA system, in order to implement message interaction, the modification mainly involves the modification of the 3GPP 25.331 protocol, for example, an extension field Uplink DPCH info is added, and the extension is performed. The extension field is mainly used to extend the original Uplink DPCH info field in the Radio Bearer Reconfiguration, Physical Channel Reconfiguration, or Transport Channel Reconfiguration message involved in the handover process.

The specific content of the extension field is:

It should be noted that this extension field is merely an example and does not limit the present invention. For example, for the Va20 protocol version, the extension field name is Uplink DPCH info Va20.

In a specific embodiment of the present invention, the method for hard handover further includes:

When the handover request message does not include the extension information specifying a dedicated signature, the target cell is randomly accessed by using a normal signature to ensure handover from the source cell to the target cell.

Specifically, in the method of the hard handover according to the embodiment of the present invention, the step of determining whether the handover request message includes the extended information specifying a dedicated signature further includes:

The determining manner is, for example, in the handover request message, confirming whether the synchronization parameter information is included, and if so, determining that it is a hard handover mode.

In the following, the method of hard switching of the present invention will be described in detail through a specific embodiment.

Referring to FIG. 3, a flowchart of a method for hard handover according to an embodiment of the present invention includes the following steps:

S301: The UE reports a test report of the handover event.

S302: The RNC determines, according to the interference situation of the current signature, whether the UE is to access the target cell by using a dedicated signature.

S303: The RNC sends a handover request message to the UE by using the source cell.

S304: After receiving the handover request message sent by the source cell, the UE confirms that the hard handover mode is adopted.

S305: Determine whether there is an extension field SYNC_UL code for HO_NCR;

S306: If no, use a normal signature to access the target cell.

S307: If yes, access the target cell by using the dedicated signature specified by the extension field.

Referring to Figure 4, a specific flow chart for completing the hard handoff using the present invention. In this handover, the handover request message is a physical channel reconfiguration message (Physical Channel Reconfiguration), and the physical channel reconfiguration message carries an extension field SYNC_UL code for HO_NCR, and the extension field SYNC_UL code for HO_NCR=7, Indicates that the eighth of the eight signatures available on the target cell is a dedicated signature. At the same time, the configuration information of the target cell includes a signature bitmap file SYNC_UL codes bitmap=01111111 for common random access, indicating that the first seven signatures are used for normal random access.

Specifically, the process of completing the hard handover is as shown in FIG. 4, and includes the following steps:

S401: The source cell sends a Physical Channel Reconfiguration to the UE.

S402: The UE acquires an extension field SYNC_UL code for HO_NCR=7;

S403: The UE uses the eighth signature to randomly access the target cell.

S404: The UE feeds back a Physical Channel Reconfiguration Complete message to the source cell.

In this way, the target cell is randomly accessed by using a dedicated signature, which avoids collision with the normal signature, so that the UE randomly accesses the target cell more robustly and has a higher success rate.

Referring to FIG. 5, an embodiment of the present invention further provides a device for hard handover, which corresponds to the method for hard handover shown in FIG. 1. The device for hard handover includes:

The receiving module 51 is configured to receive a handover request message sent by the source cell.

The determining module 52 is configured to determine whether the switching request message includes extended information specifying a dedicated signature;

The first access module 53 is configured to access the target cell by using the dedicated signature to complete the handover from the source cell to the target cell, if the determination result is yes.

The handover request message may be a radio bearer reconfiguration message (Radio Bearer Reconfiguration), a physical channel reconfiguration message (Physical Channel Reconfiguration), or a transport channel reconfiguration message (Transport Channel Reconfiguration), which is determined according to actual conditions, and the present invention is not correct. It is limited.

In a specific embodiment of the present invention, the apparatus for hard handover further includes:

As an implementation manner, the device for hard switching further includes:

Embodiments of the present invention also describe a storage medium in which a computer program is stored, the computer program being configured to perform the method of hard handover of the foregoing embodiments.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Industrial applicability

The invention receives the handover request message sent by the source cell, and determines whether the handover request message includes extension information specifying a dedicated signature, and if the determination result is yes, accessing the target cell by using the dedicated signature. In order to complete the handover from the source cell to the target cell, collision with the ordinary signature can be avoided, thereby improving the efficiency and success probability of the hard handover, and reducing the dropped call caused by the handover failure.

Claims

A method of hard handoff, comprising:

Receiving a handover request message sent by the source cell;

Determining whether the handover request message includes extension information specifying a dedicated signature;

If the determination result is yes, the dedicated cell is used to access the target cell to complete handover from the source cell to the target cell.
The method of hard switching according to claim 1, further comprising:

In a case where the handover request message does not include extension information specifying a dedicated signature, the target cell is randomly accessed using a normal signature.
The method of hard handover according to claim 1, wherein the step of determining whether the handover request message includes extension information specifying a dedicated signature further comprises:

According to the handover request message, it is determined that the handover mode is a hard handover.
The method of hard handover according to any one of claims 1 to 3, wherein the handover request message is a radio bearer reconfiguration message, a physical channel reconfiguration message or a transport channel reconfiguration message.
A hard switching device comprising:

a receiving module, configured to receive a handover request message sent by the source cell;

a determining module, configured to determine whether the switching request message includes extended information specifying a dedicated signature;

The first access module is configured to access the target cell by using the dedicated signature to complete the handover from the source cell to the target cell, if the determination result is yes.
The apparatus for hard switching according to claim 5, further comprising:

The second access module is configured to randomly access the target cell by using a normal signature if the handover request message does not include the extension information specifying a dedicated signature.
The apparatus for hard switching according to claim 5, further comprising:

The determining module is configured to determine, according to the handover request message, that the handover mode is a hard handover.
The apparatus for hard handover according to any one of claims 5 to 7, wherein the handover request message is a radio bearer reconfiguration message, a physical channel reconfiguration message or a transport channel reconfiguration message.
A storage medium storing a computer program configured to perform the hard handover method according to any one of claims 1 to 4.