WO2012159347A1

WO2012159347A1 - Switching method and related apparatus and communication system

Info

Publication number: WO2012159347A1
Application number: PCT/CN2011/077673
Authority: WO
Inventors: 谢波; 扈曙辉; 熊立群
Original assignee: 华为技术有限公司
Priority date: 2011-07-27
Filing date: 2011-07-27
Publication date: 2012-11-29
Also published as: CN103026759B; CN103026759A

Abstract

A switching method and a related apparatus and a related communication system. The method in the embodiments of the present invention comprises: a second base station sending a message to a terminal that switches from a first base station to a first carrier of a second base station, indicating the terminal to reside on a second carrier of the second base station, the coverage of the second carrier exceeding the coverage of the first carrier; and the second base station switching the terminal from the first carrier to the second carrier of the second base station.

Description

Switching method and related device and communication system

The embodiments of the present invention relate to the field of mobile communications technologies, and in particular, to a handover method, related device, and communication system.

Background technique

When the terminal (AT, Access Terminal) is in an idle state and a boundary move occurs between the access networks (AN, Access Network), an idle session transition occurs. At this time, the terminal may cause idle state ping-pong switching due to frequent changes of the signal.

In order to prevent idle state ping-pong switching, one prior art is to configure a boundary area between a source base station and a target base station as a second color code area. When the terminal is in the second color code area, it does not initiate a session migration request. Session migration occurs only after the terminal moves to a location that is covered by the target base station but is not covered by the second color code area.

The above prior art has at least the following drawbacks: since the terminal does not initiate a session migration request in the second color code region, when the terminal moves from the coverage range of the source base station to the range covered by the second color code region and the target base station, Session migration does not occur. It must wait until the terminal initiates a call to initiate a session migration, which will result in a certain call access delay.

Summary of the invention

The embodiments of the present invention provide a handover method, a related device, and a communication system, which can prevent idle ping-pong handover without generating a call access delay.

A method for switching provided by an embodiment of the present invention includes:

The second base station sends a message to the terminal that is switched from the first base station to the first carrier of the second base station, indicating that the terminal camps on the second carrier of the second base station, where the coverage of the second carrier is greater than the coverage of the first carrier ;

The second base station switches the terminal from the first carrier to the second carrier of the second base station.

Another method for switching provided by the embodiment of the present invention includes:

The terminal switches from the first base station to the first carrier of the second base station;

The terminal receives the first message sent by the second base station, where the first message is used to indicate that the terminal camps on the second carrier of the second base station, and the coverage of the second carrier is greater than the coverage of the first carrier; The terminal switches from the first carrier to the second carrier of the second base station.

A base station provided by an embodiment of the present invention includes:

a sending unit, configured to send a message to a terminal that is switched from the first base station to the first carrier of the base station, to indicate that the terminal camps on the second carrier of the base station, and the coverage of the second carrier is greater than the coverage of the first carrier ;

And a switching unit, configured to switch the terminal from the first carrier to the second carrier of the base station.

A terminal provided by the embodiment of the present invention includes:

a first switching unit, configured to switch from a first base station to a first carrier of the second base station;

a receiving unit, configured to receive a first message sent by the second base station, where the first message is used to indicate that the terminal camps on the second carrier of the second base station, and the coverage of the second carrier is greater than the coverage of the first carrier; And a unit, configured to switch from the first carrier to the second carrier of the second base station.

A communication system provided by an embodiment of the present invention includes:

a first base station, a second base station, and a terminal, where

The second base station includes: a second base station sending unit, configured to send, to the terminal that is the first carrier that is switched from the first base station to the second base station, a first message, indicating that the terminal camps on the second carrier of the second base station, and second The coverage of the carrier is greater than the coverage of the first carrier; the second base station switching unit is configured to switch the terminal from the first carrier to the second carrier of the second base station;

The terminal includes: a first switching unit, configured to switch from the first base station to the first carrier of the second base station; a first receiving unit, configured to receive a first message sent by the second base station, where the first message is used to indicate that the terminal resides And the second carrier of the second base station, the coverage of the second carrier is greater than the coverage of the first carrier, and the second switching unit is configured to switch from the first carrier to the second carrier of the second base station.

As can be seen from the above technical solutions, the embodiments of the present invention have the following advantages:

In the embodiment of the present invention, after the terminal belonging to the first base station switches to the first carrier of the second base station, the second base station sends a message to the terminal, indicating that the coverage of the terminal to the second base station is greater than that of the first carrier. The second carrier, the second base station switches the terminal from the first carrier to the second carrier of the second base station. After the terminal is switched from the first base station to the second base station, the second carrier that is larger in the second base station is camped on, so that the terminal can stably reside in the second base station when moving across the AN boundary. On the carrier, the terminal does not cause idle state ping-pong handover, and since the terminal is always subordinate to the switched second base station after being switched from the first base station, the terminal can initiate a call at any time, thereby reducing call access. Delay.

DRAWINGS

FIG. 1 is a schematic diagram of a method for handover according to an embodiment of the present invention;

2 is a schematic diagram of another method for handover according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a communication system according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a carrier configuration on a base station of a communication system according to an embodiment of the present invention; FIG. 7 is a schematic diagram of a terminal handover in a communication system according to an embodiment of the present invention.

detailed description

Referring to FIG. 1 , a method for switching according to an embodiment of the present invention includes:

101. The second base station sends a message to the terminal that is switched from the first base station to the first carrier of the second base station, and indicates that the terminal camps on the second carrier of the second base station.

In the embodiment of the present invention, after the terminal switches from the first base station to the first carrier of the second base station, the second base station sends a message to the terminal, indicating that the terminal camps on the second carrier, where the coverage of the second carrier The range is greater than the coverage of the first carrier. The carrier that is dependent on the first base station includes a third carrier, and the carrier that is dependent on the second base station includes a first carrier and a second carrier, where the frequency of the first carrier and the third carrier are the same, and the first base station and the second base station are Two adjacent base stations. When the terminal moves from the coverage of the third carrier of the first base station to the coverage of the second base station, the terminal performs handover at the boundary between the first base station and the second base station, because the frequency of the third carrier before the terminal is switched, and the second The frequency of the first carrier of the base station is the same, so after the terminal switches from the first base station to the second base station, the terminal preferentially selects the first carrier attached to the second base station. At this time, in order to prevent the terminal from moving at the boundary of the first carrier, the second base station sends a message to the terminal, indicating that the terminal camps on the second carrier with a larger coverage.

102. The second base station switches the terminal from the first carrier to the second carrier of the second base station.

In the embodiment of the present invention, when the second base station sends a message to the terminal, indicating that the terminal camps on the second carrier, the second base station switches the terminal from the first carrier to the second carrier of the second base station, where the second carrier The coverage is greater than the coverage of the first carrier. In practical applications, the second base station will configure the carrier The coverage of the first carrier and the second carrier that are subordinate to the second base station are set to be different, that is, the coverage ranges of the first carrier and the second carrier are different, for example, when configuring the carrier of the second base station, The coverage of the two carriers is configured as (N + N db, and the coverage of the first carrier is configured as (N - N ₂ ) db, N,

N ₂ is a positive number, and further, it can be configured = N ₂ = N. At this time, the coverage of the second carrier is configured as (N + N.) db, and the coverage of the first carrier is (N - N ₀ ) db.

Optionally, in order to achieve stable camping of the terminal on a certain carrier frequency, after the carrier is configured for the second base station, the camping mode of the carrier on the second base station may be set to the carrier with the largest coverage. For example, if the terminal in the coverage of the second base station camps on the carrier with the largest coverage on the second base station, the terminal can be stably resident. If the terminal camps on the second base station, the coverage is not the largest. For the carrier, the second base station may designate the terminal to perform handover, that is, switch from a carrier with a small coverage on the second base station to a carrier with the largest coverage on the second base station to achieve stable camping.

In the embodiment of the present invention, the coverage of the first carrier on the second base station is smaller than the coverage of the second carrier on the second base station. At this time, the second base station switches the terminal from the first carrier to the coverage area. On the second carrier.

In an embodiment of the present invention, the method further includes that the carrier that is dependent on the first base station further includes a fourth carrier, where the frequency of the fourth carrier on the first base station and the second carrier on the second base station are the same. The coverage of the fourth carrier is smaller than the coverage of the third carrier on the first base station. In a practical application, the first base station and the second base station adjacent to the first base station may adopt an opposite configuration strategy when configuring the carrier, and the second base station-subordinate carrier has a first carrier and a second carrier, and the first base station is dependent on the first base station. The carrier has a third carrier and a fourth carrier, where the frequency of the first carrier and the third carrier are the same as FA, and the frequency of the second carrier and the fourth carrier are the same as FB, then the carrier is configured for the second base station. The coverage of the second carrier is greater than the coverage of the first carrier, and the coverage of the fourth carrier is smaller than the coverage of the third carrier when the carrier is configured for the first base station. It should be noted that, in the embodiment of the present invention, the method further includes: in order to make the carrier coverage of the second carrier larger than the coverage of the first carrier, the transmit power of the first carrier or the second carrier may be controlled. For example, the second base station may control the transmit power of the second carrier to be greater than the transmit power of the first carrier by controlling the transmit power of the second carrier; or the second base station may cause the first carrier by controlling the transmit power of the first carrier. The transmit power is less than the transmit power of the second carrier. In order to make the coverage of the fourth carrier smaller than the coverage of the third carrier, the first The transmit power of the three carriers is greater than the transmit power of the fourth carrier. In the embodiment of the present invention, the coverage of each carrier in the same carrier may be different for the multiple carriers on the base station, and the coverage of each carrier configured on the base station in the prior art is the same.

In an actual application, the coverage manner of the third carrier is the same as the coverage of the second carrier, and the coverage of the fourth carrier is the same as the coverage of the first carrier. For example, the coverage of the third carrier of the first base station may be configured as Nldb, and the coverage of the fourth carrier of the first base station may be configured as N2db, and the coverage of the second carrier of the second base station may be configured as Nldb. The coverage of the first carrier of the second base station is configured as N2db, and N1>N2. It should be noted that, in the embodiment of the present invention, the coverage of carriers under the same base station with different frequency points is different, but the configuration of the coverage of carriers under each base station having the same frequency point in the prior art is the same.

In the embodiment of the present invention, after the terminal of the first base station switches to the first carrier of the second base station, the second base station sends a message to the terminal, indicating that the coverage of the terminal to the second base station is greater than that of the first carrier. The second carrier, the second base station switches the terminal from the first carrier to the second carrier of the second base station. After the terminal switches from the first base station to the second base station, the second carrier that covers the second base station is camped on, so that the terminal can stably reside in the second base station when moving across the AN boundary. On the carrier, the terminal does not cause idle state ping-pong handover. In addition, since the terminal belongs to the second base station after handover after being switched from the first base station, the terminal can initiate a call at any time, thereby reducing the call access delay.

The foregoing embodiment describes a method for performing handover on the base station side according to the embodiment of the present invention. Next, the method for performing handover on the terminal side according to the embodiment of the present invention is introduced. As shown in FIG. 2, the method includes:

201. The terminal switches from the first base station to the first carrier of the second base station.

In the embodiment of the present invention, when the terminal moves from the coverage of the first base station to the coverage of the second base station, the terminal switches from the first base station to the first carrier of the second base station. The carrier that is dependent on the first base station includes a third carrier, and the carrier that is dependent on the second base station includes a first carrier and a second carrier, where the frequency of the first carrier and the third carrier are the same, and the first base station and the second base station are Two adjacent base stations. When the terminal moves from the coverage of the first base station to the coverage of the second base station, the terminal at the third carrier coverage of the first base station switches at the boundary between the first base station and the second base station, because the terminal is located before the terminal handover The frequency of the three carriers is the same as the frequency of the first carrier of the second base station. Therefore, after the terminal switches from the first base station to the second base station, the terminal preferentially selects the first carrier attached to the second base station. 202. The terminal receives the first message sent by the second base station, where the first message is used to indicate that the terminal camps on the second carrier of the second base station, and the coverage of the second carrier is greater than the coverage of the first carrier.

In the embodiment of the present invention, after the terminal is switched from the first base station to the first carrier of the second base station, the terminal receives the first message sent by the second base station, where the first message is used to indicate that the terminal resides in the second The second carrier of the base station. The second base station indicates that the terminal camps on the second carrier whose coverage is larger than the first carrier, and enables the terminal to stably reside.

203. The terminal switches from the first carrier to the second carrier of the second base station.

In the embodiment of the present invention, after the second base station detects that the terminal switches from the third carrier of the first base station to the first carrier of the second base station, the terminal switches from the first carrier to the second carrier of the second base station, and second. The coverage of the carrier is greater than the coverage of the first carrier. In a practical application, the second base station may set the coverage of the first carrier and the second carrier that belong to the second base station to be different when the carrier is configured, that is, the coverage ranges of the first carrier and the second carrier are different. .

Optionally, in the embodiment of the present invention, the camping mode of the terminal on the carrier may be set to be the carrier with the largest coverage area on the base station side. It is assumed that the carrier that belongs to the second base station includes the first carrier and the second carrier, the coverage of the first carrier is smaller than the coverage of the second base station, and the coverage of the second base station is that the second base station has the largest coverage on the second base station. After the terminal is switched from the third carrier of the first base station to the first carrier of the second base station, since the coverage of the first carrier on the second base station is smaller than the coverage of the second base station, the terminal needs to be from the second base station. The first carrier is switched to the second carrier of the second base station. Therefore, when the terminal moves across the AN boundary, it can stably reside on the second carrier of the second base station, and does not cause the terminal to perform idle state ping-pong switching.

In the embodiment of the present invention, the coverage of the first carrier on the second base station is smaller than the coverage of the first carrier on the second base station, and the second base station switches the terminal from the first carrier to the coverage area. The coverage of a carrier on the second carrier.

In an embodiment of the present invention, the method further includes that the carrier that is dependent on the first base station further includes a fourth carrier, where the frequency of the fourth carrier on the first base station and the second carrier on the second base station are the same. The coverage of the fourth carrier is smaller than the coverage of the third carrier on the first base station. In an actual application, when configuring a carrier of the first base station and the second base station adjacent to the first base station, an opposite configuration policy may be adopted, where the second base station-subordinate carrier has a first carrier and a second carrier, and the first base station is dependent. The carrier has a third carrier and a fourth carrier, where the frequency of the first carrier and the third carrier are the same as FA, and the second carrier If the frequency of the fourth carrier is the same as the FB, the carrier coverage of the second carrier is greater than the coverage of the first carrier when the carrier is configured for the second base station, and the fourth carrier is configured when the carrier is configured for the first base station. The coverage is smaller than the coverage of the third carrier. It should be noted that, in the embodiment of the present invention, the method further includes: in order to make the carrier coverage of the second carrier larger than the coverage of the first carrier, the second base station may control the transmit power of the first carrier or the second carrier, so that The transmit power of the second carrier is greater than the transmit power of the first carrier; in order to make the coverage of the fourth carrier smaller than the coverage of the third carrier, the first base station may control the transmit power of the third carrier or the fourth carrier, so that the third carrier The transmit power is greater than the transmit power of the fourth carrier. It should be noted that, in the embodiment of the present invention, the coverage of each carrier in the same carrier may be different for the multiple carriers on the base station, and the coverage of each carrier configured on the base station in the prior art is the same. . In a practical application, the method further includes: the terminal switching from the second carrier of the second base station to the fourth carrier of the first base station; the terminal receiving the second message sent by the first base station, where the second message is used to indicate that the terminal resides a third carrier to the first base station; the terminal switches from the fourth carrier to the third carrier of the first base station.

In the embodiment of the present invention, after the terminal belonging to the first base station switches to the first carrier of the second base station, after receiving the first message of the second base station, the terminal switches from the first carrier to the instruction according to the first message. The second base station covers a second carrier that is larger than the first carrier. After the terminal is switched from the first base station to the second base station, the second carrier that is larger in the second base station is camped on, so that the terminal can stably reside in the second base station when moving across the AN boundary. On the carrier, the terminal does not cause idle state ping-pong handover, and since the terminal is always subordinate to the switched second base station after being switched from the first base station, the terminal can initiate a call at any time, thereby reducing the call access delay.

The foregoing embodiment describes the method for performing handover based on the base station side and the terminal side in the embodiment of the present invention. Next, the base station and the terminal and the communication system using the foregoing methods respectively provided by the embodiments of the present invention are introduced.

Referring to FIG. 3, a base station 300 according to an embodiment of the present invention includes:

The sending unit 301 is configured to send a message to the terminal that is switched from the first base station to the first carrier of the base station 300, to indicate that the terminal camps on the second carrier of the base station 300, where the coverage of the second carrier is greater than the first carrier. Coverage

The switching unit 302 is configured to switch the terminal from the first carrier to the second carrier of the base station 300, where the coverage of the second carrier is greater than the coverage of the first carrier. In the embodiment of the present invention, the carrier that is dependent on the first base station includes a third carrier, and the carrier that is dependent on the base station 300 includes a first carrier and a second carrier, where the frequency of the first carrier and the third carrier are the same, the first The base station and the base station 300 are two adjacent base stations. When the terminal moves from the coverage of the first base station to the coverage of the base station 300, the terminal of the third carrier belonging to the first base station performs at the boundary between the first base station and the base station 300. Switching, since the frequency of the third carrier before the terminal handover is the same as the frequency of the first carrier of the base station 300, after the terminal switches from the first base station to the base station 300, the terminal preferentially selects the first carrier attached to the base station 300. At this time, the sending unit 301 sends a message to the terminal that is switched from the first base station to the first carrier of the base station 300, indicating that the terminal camps on the second carrier of the base station 300, and the coverage of the second carrier is greater than the The coverage of the first carrier.

In the embodiment of the present invention, when the sending unit 301 is configured to send a message to the terminal, indicating that the terminal camps on the second carrier with a large coverage, the switching unit 302 is configured to switch the terminal from the first carrier to the base station 300. Second carrier. In a practical application, the base station 300 configures the coverage of the first carrier and the second carrier that belong to the base station 300 to be different when the carrier is configured, that is, the coverage ranges of the first carrier and the second carrier are different. In a practical implementation, the base station 300 further includes a control unit, configured to control a transmit power of the first carrier or the second carrier, so that a coverage of the second carrier is greater than the first carrier. Coverage. For example, the control unit may control the transmit power of the second carrier to be greater than the transmit power of the first carrier by controlling the transmit power of the second carrier; or by controlling the transmit power of the first carrier. The transmit power of the first carrier is made smaller than the transmit power of the second carrier.

The above embodiment only describes the structural relationship between the unit modules. In the actual application, the method for executing each unit module is as shown in Figure 1, and will not be described here.

In the embodiment of the present invention, after the terminal belonging to the first base station switches to the first carrier of the base station 300, the sending unit 301 sends a message to the terminal, indicating that the terminal camps in the second base station and the coverage is greater than the first carrier. The two carrier, the switching unit 302 switches the terminal from the first carrier to the second carrier in the base station 300 whose coverage is larger than the first carrier. After the terminal is switched from the first base station to the base station 300, the resident station 300 covers the second carrier with a larger coverage. Therefore, when the terminal moves across the AN boundary, the terminal can stably reside on the second carrier of the base station 300, This will cause the terminal to have an idle state ping-pong switch. In addition, since the terminal can be subordinate to the base station 300 after handover after being switched from the first base station, the terminal can initiate a call at any time, thereby reducing the call access delay. The above embodiment describes the base station provided by the embodiment of the present invention. Next, the terminal provided by the embodiment of the present invention is introduced. As shown in FIG. 4, the terminal 400 includes:

The first switching unit 401 is configured to switch from the first base station to the first carrier of the second base station, where the first receiving unit 402 is configured to receive the first message sent by the second base station, where the first message is used to indicate that the terminal camps to The second carrier of the second base station, the coverage of the second carrier is greater than the coverage of the first carrier;

The second switching unit 403 is configured to switch from the first carrier to the second carrier of the second base station.

In the embodiment of the present invention, the carrier that is dependent on the first base station includes a third carrier, and the carrier that is dependent on the second base station includes a first carrier and a second carrier, where the frequency of the first carrier and the third carrier are the same, A base station and a second base station are two adjacent base stations. When the terminal moves from the coverage of the first base station to the coverage of the second base station, the first switching unit 401 of the terminal 400 sets the terminal 400 at the first base station and the second base station. The boundary of the base station is switched. Since the frequency of the third carrier before the terminal handover is the same as the frequency of the first carrier of the second base station, after the terminal switches from the first base station to the second base station, the terminal preferentially attaches to the terminal. The first carrier of the second base station.

In the embodiment of the present invention, after the first switching unit 401 of the terminal is switched from the first base station to the first carrier of the second base station, the first receiving unit 402 receives the first message sent by the second base station, where the first message is used to indicate The terminal camps on the second carrier of the second base station, and the second switching unit 403 switches the terminal 400 from the first carrier to the second carrier of the second base station, and the coverage of the second carrier is greater than the coverage of the first carrier. In a practical application, when the second base station configures the carrier, the coverage of the first carrier and the second carrier that are also subordinate to the second base station are different, that is, the coverage ranges of the first carrier and the second carrier are different.

In the embodiment of the present invention, the terminal 400 may further include (not shown in FIG. 4): a third switching unit, configured to switch from a second carrier of the second base station to a fourth carrier of the first base station, and fourth The frequency of the carrier is the same as the frequency of the second carrier, and the coverage of the fourth carrier is smaller than the coverage of the third carrier;

a second receiving unit, configured to receive a second message sent by the first base station, where the second message is used to indicate that the terminal camps on the third carrier of the first base station;

And a fourth switching unit, configured to switch from the fourth carrier to the third carrier of the first base station.

The above embodiment only introduces the structural relationship between each unit module. In practical applications, each unit For the execution method of the module, please refer to the method shown in Figure 2, which will not be described here.

Optionally, in the embodiment of the present invention, the camping mode of the terminal on the carrier may be set to be the carrier with the largest coverage area on the base station side. It is assumed that the carrier that belongs to the second base station includes the first carrier and the second carrier, the coverage of the first carrier is smaller than the coverage of the second base station, and the coverage of the second base station is that the second base station has the largest coverage on the second base station. After the first switching unit 401 switches the terminal 400 from the third carrier of the first base station to the first carrier of the second base station, since the coverage of the first carrier on the second base station is smaller than the coverage of the second base station, Therefore, the second switching unit 403 needs to switch the terminal 400 from the first carrier of the second base station to the second carrier of the second base station. Therefore, when the terminal moves across the AN boundary, it can stably reside on the second carrier of the second base station, and does not cause idle ping-pong switching of the terminal.

The following describes the communication system provided by the embodiment of the present invention. As shown in FIG. 5, the communication system 500 includes: a first base station 501, a second base station 502, and a terminal 503, where

The second base station 502 includes: a second base station sending unit 5021, configured to send a first message to the terminal 503 that is switched from the first base station 501 to the first carrier of the second base station 502, and instruct the terminal 503 to camp on the second base station 502. The second carrier, the coverage of the second carrier is greater than the coverage of the first carrier; the second base station switching unit 5022 is configured to switch the terminal 503 from the first carrier to the second carrier of the second base station 502;

The terminal 503 includes: a first switching unit 5031, configured to switch from the first base station 501 to the first carrier of the second base station 502; a first receiving unit 5032, configured to receive the first message sent by the second base station 502, the first message a second carrier for indicating that the terminal 503 is camped on the second base station 502. The coverage of the second carrier is greater than the coverage of the first carrier. The second switching unit 5033 is configured to switch from the first carrier to the second base station 502. Second carrier.

Optionally, the foregoing first base station 501 specifically includes: a first base station sending unit 5011, configured to send a second message to the terminal 503 that is switched from the second base station 502 to the fourth carrier of the first base station 501, to indicate that the terminal 503 resides To the third carrier of the first base station 501, the coverage of the fourth carrier is smaller than the coverage of the third carrier; the first base station switching unit 5012 is configured to switch the terminal 503 from the fourth carrier to the third carrier of the first base station 501. ;

The terminal 503 further includes:

The third switching unit 5034 is configured to switch from the second carrier of the second base station 502 to the first base station 501. The fourth carrier, the frequency of the fourth carrier is the same as the frequency of the second carrier, and the coverage of the fourth carrier is smaller than the coverage of the third carrier. The second receiving unit 5035 is configured to receive the first sending by the first base station 501. The second message is used to indicate that the terminal 503 camps on the third carrier of the first base station 501. The fourth switching unit 5036 is configured to switch from the fourth carrier to the third carrier of the first base station 501.

The above embodiment only describes the structural relationship between the unit modules. In the actual application, the method for executing each unit module is as shown in FIG. 1 and FIG. 2, and details are not described herein again.

In the embodiment of the present invention, after the terminal 503 belonging to the first base station 501 switches to the first carrier of the second base station 502, the second base station 502 switches the terminal from the first carrier to the second base station 502, and the coverage is greater than the first. The second carrier of the carrier. Since the terminal 503 is switched from the first base station 501 to the second base station 502, the second carrier in the second base station 502 having a larger coverage is camped on, so that the terminal 503 can stably reside in the first time when moving across the AN boundary. The second carrier of the second base station 502 does not cause the terminal to perform idle state ping-pong handover. In addition, since the terminal 503 is always subordinate to the switched second base station 502 after being switched from the first base station 501, the terminal 503 can initiate a call at any time. This reduces the call access delay.

The following describes the communication system in the embodiment of the present invention in a practical application scenario. As shown in FIG. 6, the handover process between the first base station 601 and the second base station 602 of the terminal 605 will be described in detail, and the first base station 601 is configured. The third carrier 6011 and the fourth carrier 6012 are subordinated, and the coverage of the third carrier 6011 is greater than the coverage of the fourth carrier 6012. The second base station 602 is associated with the first carrier 6021 and the second carrier 6022, and the first carrier 6021. The coverage is smaller than the coverage of the second carrier 6022; the frequency of the third carrier 6011 and the first carrier 6021 is the same as FA, and the frequency of the fourth carrier 6012 and the second carrier 6022 is the same as the switching center of the FB, FA and FB. In different areas, the switching center band of the FA is 603, and the switching center band of the FB is 604. As shown in FIG. 7, the subordinate terminal 605 on the first base station 601 resides in the coverage of the subordinate first base station 601. The largest carrier is the third carrier 6011. Assume that the terminal 605 moves from the first base station 601 to the second base station 602. When the terminal 605 is on the left side of the handover center band 604 of the frequency point FA, the third carrier 6011 is strong, and the terminal 605 can stably reside on the third carrier 6011. When the terminal 605 moves to the right of the handover center band 604, the signal of the third carrier 6011 becomes weak, and the terminal 605 receives the first carrier 6021 signal of the second base station 602 at any time, and can no longer stably reside in the first base station 601, the terminal. 605 is switched to the first carrier 6021 whose frequency is the same as the third carrier 6011. According to the method provided by the embodiment of the present invention, the second base station 602 requests the terminal 605. The second carrier 6022, which is the carrier with the largest coverage in the second base station 602, is camped on, so that the terminal 605 immediately switches to the second carrier 6022 of the second base station 602 to camp. At this time, the signal of the second carrier 6022 is very good, and the terminal 605 can be stably parked, and the ping-pong will not be switched to the first base station 601, so that the idle state ping-pong can be prevented. In the same case, when the terminal moves from the second base station 602 to the first base station 601, the terminal 605 is stable to the second carrier of the second base station 602 with strong signal when the handover center band 603 of the frequency point FB is right. After the terminal 605 crosses the handover center band 603, the terminal 605 switches to the fourth carrier 6012 with the same frequency as the second carrier 6022. According to the method provided by the embodiment of the present invention, the first base station 601 requests the terminal 605 to be stationed. The third carrier 6011, which is the carrier with the largest coverage of the first base station 601, is left, and the terminal 605 immediately switches to the third carrier 6011 of the first base station 601 to camp. At this time, the signal of the third carrier 6011 is very good, and the terminal 605 can be stably camped, and the ping-pong will not be switched to the second base station 602, so that the idle state ping-pong switching can be prevented.

A person skilled in the art can understand that all or part of the steps of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium, and the above mentioned storage medium can be It is a read-only memory, a disk or a disc.

The method and the related device and the communication system provided by the present invention are described in detail above. For those skilled in the art, according to the idea of the embodiment of the present invention, the specific implementation manner and the application range may be changed. Therefore, the content of the present specification should not be construed as limiting the invention.

Claims

Rights request

A method for switching, comprising:

The second base station sends a message to the terminal that is switched from the first base station to the first carrier of the second base station, indicating that the terminal camps on the second carrier of the second base station, and the coverage of the second carrier is greater than the The coverage of the first carrier;

The second base station switches the terminal from the first carrier to a second carrier of the second base station.

The method of handover according to claim 1, wherein the terminal is a terminal that switches from a third carrier of the first base station to a first carrier of the second base station, and the frequency of the first carrier The point is the same as the frequency of the third carrier.

The method for switching according to claim 1 or 2, wherein the second base station controls a transmit power of the first carrier or the second carrier, so that a coverage of the second carrier is greater than the first The coverage of a carrier.

The method for switching according to claim 3, wherein the controlling, by the second base station, the transmit power of the first carrier or the second carrier specifically includes:

Transmitting, by the second base station, a transmit power of the second carrier, so that a transmit power of the second carrier is greater than a transmit power of the first carrier; or

The second base station controls a transmit power of the first carrier such that a transmit power of the first carrier is smaller than a transmit power of the second carrier.

5. A method of switching, comprising:

Receiving, by the terminal, the first message sent by the second base station, where the first message is used to indicate that the terminal camps on the second carrier of the second base station, and the coverage of the second carrier is greater than the The coverage of the first carrier;

The terminal switches from the first carrier to a second carrier of the second base station.

The method for switching according to claim 5, wherein the switching of the first carrier from the first base station to the second base station of the terminal specifically includes: the terminal switching from the third carrier of the first base station to the first The first carrier of the second base station, the frequency of the first carrier is the same as the frequency of the third carrier.

7. The method of switching as claimed in claim 6, wherein The terminal is switched from the second carrier of the second base station to the fourth carrier of the first base station, the frequency of the fourth carrier is the same as the frequency of the second carrier, and the fourth carrier is The coverage is smaller than the coverage of the third carrier;

Receiving, by the terminal, the second message sent by the first base station, where the second message is used to indicate that the terminal camps on a third carrier of the first base station;

The terminal switches from the fourth carrier to a third carrier of the first base station.

The method of handover according to any one of claims 5 to 7, wherein the method further comprises: transmitting power of the second carrier is greater than a transmitting power of the first carrier.

The method of handover according to any one of claims 6 to 7, wherein the method further comprises: transmitting power of the third carrier is greater than transmission power of the fourth carrier.

10. A base station, comprising:

a sending unit, configured to send a message to a terminal that is switched from the first base station to the first carrier of the base station, to indicate that the terminal camps on a second carrier of the base station, where a coverage of the second carrier is greater than The coverage of the first carrier;

And a switching unit, configured to switch the terminal from the first carrier to a second carrier of the base station.

The base station according to claim 10, wherein the base station further comprises a control unit, wherein the control unit is configured to control a transmit power of the first carrier or the second carrier to enable coverage of the second carrier The range is greater than the coverage of the first carrier.

The base station according to claim 11, wherein the control unit is specifically configured to control a transmit power of the second carrier, so that a transmit power of the second carrier is greater than a transmit of the first carrier The power is used to control the transmit power of the first carrier such that the transmit power of the first carrier is smaller than the transmit power of the second carrier.

13. A terminal, comprising:

a first receiving unit, configured to receive a first message sent by the second base station, where the first message is used to indicate that the terminal camps on a second carrier of the second base station, and the second carrier is covered by The range is greater than the coverage of the first carrier;

And a second switching unit, configured to switch from the first carrier to the second carrier of the second base station.

The terminal according to claim 13, wherein the first switching unit is specifically used And switching from the third carrier of the first base station to the first carrier of the second base station, the frequency of the first carrier is the same as the frequency of the third carrier.

The terminal according to claim 13, wherein the terminal further includes: a third switching unit, configured to switch from a second carrier of the second base station to a fourth carrier of the first base station, The frequency of the fourth carrier is the same as the frequency of the second carrier, and the coverage of the fourth carrier is smaller than the coverage of the third carrier;

a second receiving unit, configured to receive a second message sent by the first base station, where the second message is used to indicate that the terminal camps on a third carrier of the first base station;

A communication system, comprising: a first base station, a second base station, and a terminal, wherein

The second base station includes: a second base station sending unit, configured to send a first message to a terminal that is switched from the first base station to the first carrier of the second base station, to instruct the terminal to camp on the first a second carrier of the second base station, the coverage of the second carrier is greater than the coverage of the first carrier, and the second base station switching unit is configured to switch the terminal from the first carrier to the second base station Second carrier

The terminal includes: a first switching unit, configured to switch from the first base station to a first carrier of the second base station; a first receiving unit, configured to receive a first message sent by the second base station, where The first message is used to indicate that the terminal camps on the second carrier of the second base station, the coverage of the second carrier is greater than the coverage of the first carrier, and the second switching unit is used to The first carrier is switched to the second carrier of the second base station.

The communication system according to claim 16, wherein the first base station specifically includes:

a first base station sending unit, configured to send a second message to the terminal that is switched from the second base station to the fourth carrier of the first base station, to indicate that the terminal camps on the third carrier of the first base station, The coverage of the fourth carrier is smaller than the coverage of the third carrier; the first base station switching unit is configured to switch the terminal from the fourth carrier to the third carrier of the first base station;

The terminal further includes: a third switching unit, configured to switch from a second carrier of the second base station to a fourth carrier of the first base station, a frequency point of the fourth carrier, and a frequency of the second carrier The frequency is the same, The coverage of the fourth carrier is smaller than the coverage of the third carrier; the second receiving unit is configured to receive the second message sent by the first base station, where the second message is used to indicate that the terminal resides a third carrier to the first base station; a fourth switching unit, configured to switch from the fourth carrier to a third carrier of the first base station.