CN102196452B - Frequency switching method and equipment - Google Patents

Abstract

The embodiment of the invention discloses a frequency switching method which comprises the steps of sending the information of a spare idle frequency point to the terminal by a network-side equipment, and indicating the terminal to switch to the spare idle frequency point by the network-side equipment, when the network-side equipment detects that an authorized signal is included in a current working frequency point, and switching the working frequency to the spare idle frequency point. In the embodiment of the invention, when the terminal is interfered by the authorized signal, the reliability of the frequency switching is enhanced, and cost of the signal-switching is saved.

Description

A frequency switching method and device

technical field

The present invention relates to the technical field of communication, in particular to a frequency switching method and equipment.

Background technique

With the rapid development of wireless communication technology, the limited spectrum resource becomes more and more tense. In order to effectively use spectrum resources, the concept of cognitive radio (Cognitive Radio) is proposed. The core idea of cognitive radio is to enable wireless communication devices to have the ability to discover and reasonably use spectrum holes, so that wireless communication devices with cognitive functions Ability to operate in licensed frequency bands in an opportunistic manner.

Specifically, the current research on spectrum sensing technology is mainly concentrated in the wireless local area network, and the wireless cellular communication system is different from the general wireless local area network or small access network. Roaming between different countries.

In the prior art, a method for effectively utilizing spectrum holes based on existing cellular communication signaling is proposed. In the original signaling of the existing cellular communication mode between the base station and the terminal, the signaling messages used to configure the frequency point, bandwidth and perceived spectrum hole of the cognitive communication mode are added, and the base station determines the cognitive communication based on the sensing results mode (communication working parameters including frequency, bandwidth and spectrum hole information), and notify the terminal in time through the signaling of the existing cellular communication mode. After the terminal obtains the signaling information, it configures the communication mode it recognizes according to the effective time. In addition, the results of spectrum sensing are exchanged between the base stations, and the terminal reports the spectrum sensing information to the base station through signaling in the existing cellular communication mode.

In addition, a method for switching the communication frequency between the mobile station and the base station is also proposed in the prior art. When the mobile station needs to be handed over at the cell boundary, the mobile station measures the communication quality of adjacent base stations at different frequency points, and feeds the communication quality information back to the base station control device, and the base station control device performs frequency handover decisions based on the communication quality. When the mobile station uses the PCR (Physical Channel Reconfiguration) received from the base station control device as a trigger signal to activate the different frequency monitoring function to maintain the communication quality level, so that the process proceeds to the different frequency monitoring mode and switches the communication frequency.

In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art:

In the method of effectively utilizing spectrum holes based on existing cellular communication signaling, although cognitive radio technology can be effectively used in wireless cellular communication systems, spectrum hole resources can be fully utilized, and possible conflicts with authorized users can be reduced. However, this solution does not take into account the specific method of switching the working frequency of the cognitive radio cellular communication network, nor does it involve the method for the terminal to switch the frequency when it is interfered by the authorized signal and cannot obtain the signaling message of the frequency switching in time. And this scheme must modify the existing cellular communication protocol.

In the method of switching the communication frequency between the mobile station and the base station, this scheme is mainly aimed at the CDMA (Code Division Multiple Access, code division multiple access) system. It is necessary to change the operating frequency; it does not consider the situation that both the terminal and the base station need to switch the operating frequency when the frequency of the sensory radio cellular communication network is switched; it does not consider the specific interaction process when both the terminal and the base station switch the operating frequency; In the radio cellular communication network, the terminal may be interfered by the authorization signal and cannot receive the handover message correctly.

Contents of the invention

Embodiments of the present invention provide a frequency switching method and device to realize the process of switching operating frequencies between a base station and a terminal in a cognitive radio cellular communication network.

In order to achieve the above purpose, an embodiment of the present invention proposes a frequency switching method, including the following steps:

The network side device sends the information of the standby idle frequency point to the terminal, and when the network side device detects that there is an authorization signal in the current working frequency point, the network side device instructs the terminal to switch to the standby idle frequency point, and switching the working frequency to the standby idle frequency point;

Wherein, the network side device sends the information of the standby idle frequency point to the terminal, specifically: the network side device periodically broadcasts the information of the standby idle frequency point to each terminal in a system broadcast message;

The network side device instructs the terminal to switch to the standby idle frequency point, including:

The network side device sends switching messages to each connected terminal through a dedicated control channel, which carries access resource information and air interface configuration information;

The network-side device sends a system broadcast message to each terminal, which carries carrier frequency switching instruction information for instructing the terminal to switch the working frequency to an alternate idle frequency point.

The embodiment of the present invention also proposes a network side device, including:

The sending module is used to send the information of the standby idle frequency point to the terminal, and instruct the terminal to switch to the standby idle frequency point when detecting that there is an authorization signal in the current working frequency point;

A processing module, configured to switch the working frequency to the standby idle frequency point;

Wherein, the sending module is specifically configured to periodically broadcast the information of the standby idle frequency point to each terminal through a system broadcast message;

And send switching messages to each connected terminal through a dedicated control channel, which carries access resource information and air interface configuration information; and sends a system broadcast message to each terminal, which carries a message for instructing the terminal to switch the working frequency to an alternate idle frequency point Carrier frequency conversion instruction information.

The embodiment of the present invention also proposes a terminal, including:

The receiving module is used to receive the information of the standby idle frequency point from the network side device, and when the network side device detects that there is an authorization signal in the current working frequency point, receive the network side device instructing the terminal to switch to the standby idle frequency point. point indication information;

A judging module, configured to judge whether the receiving module can receive indication information from the network side device instructing the terminal to switch to the standby idle frequency point when the network side device detects that there is an authorization signal in the current working frequency point;

A processing module, configured to execute the process of switching the working frequency according to the received message when the judgment result of the judging module is yes;

The receiving module is specifically configured to receive the information of the standby idle frequency point periodically broadcast to each terminal by the network side device through a system broadcast message;

and receiving switching messages sent by the network side device to each connected terminal through a dedicated control channel, which carry access resource information and air interface configuration information;

and receiving a system broadcast message sent by the network side device to each terminal, which carries carrier frequency switching instruction information for instructing the terminal to switch the working frequency to an alternate idle frequency point.

Compared with the prior art, the present invention has at least the following advantages:

By using cellular communication signaling, the base station and terminal in the cognitive radio cellular communication network can switch operating frequencies and maintain normal communication; when the terminal is interfered by authorized signals, the reliability of the frequency switching of the cognitive radio cellular communication network is enhanced, and the system is reduced. The time for re-establishing communication after frequency switching; and the simultaneous switching of operating frequencies of base stations and terminals in the cognitive radio cellular communication network can be realized without modifying the existing cellular communication protocol; further, it can also be realized by modifying the existing cellular communication protocol In the cognitive radio cellular communication network, the base station and the terminal switch the operating frequency at the same time, and can further improve the reliability of the frequency switching of the cognitive radio cellular communication network, and reduce the time for re-establishing communication after the system frequency switching.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a flowchart of a frequency switching method proposed in Embodiment 1 of the present invention;

FIG. 2 is a flowchart of a frequency switching method proposed in Embodiment 2 of the present invention;

FIG. 3 is a flowchart of a frequency switching method on the network side in Embodiment 3 of the present invention;

FIG. 4 is a flowchart of a frequency switching method on the terminal side in Embodiment 3 of the present invention;

FIG. 5 is a flowchart of a frequency switching method on the network side in Embodiment 4 of the present invention;

FIG. 6 is a flowchart of a frequency switching method on the terminal side in Embodiment 4 of the present invention;

FIG. 7 is a flowchart corresponding to a frequency switching method in a specific application scenario in Embodiment 2 of the present invention;

FIG. 8 is a flowchart corresponding to a frequency switching method in a specific application scenario in Embodiment 3 of the present invention;

FIG. 9 is a flowchart corresponding to a frequency switching method in a specific application scenario in Embodiment 4 of the present invention;

FIG. 10 is a structural diagram of a network-side device proposed in an embodiment of the present invention;

FIG. 11 is a structural diagram of a terminal proposed in an embodiment of the present invention;

FIG. 12 is a structural diagram of another network-side device proposed in an embodiment of the present invention;

Fig. 13 is a structural diagram of another terminal proposed in the embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments in the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the embodiments of the present invention.

As shown in FIG. 1, a frequency switching method is proposed in an embodiment of the present invention, including the following steps:

Step 101, when the network-side device detects that there is an authorization signal in the current working frequency point, the network-side device sends a switching message to the terminal through a dedicated control channel to instruct the terminal to switch to an alternate idle frequency point, which carries the signal that needs to be switched Information about the spare idle frequency points that have been received.

Step 102, the network side device switches the working frequency to the standby idle frequency point.

It should be noted that before the network side device sends the switching message, it also includes: the network side device obtains the priority of each spare idle frequency point, and selects the spare idle frequency point according to the priority of each spare idle frequency point The information of the standby idle frequency points carried in the switching message is the information of the standby idle frequency points selected by the network side equipment according to the priority of each standby idle frequency point; the standby idle frequency point switched to by the network side equipment The frequency point is a spare idle frequency point selected by the network side device according to the priority of each spare idle frequency point.

After the network side device sends the switching message, it also includes: if the terminal receives the switching message, perform a switching process to the standby idle frequency point according to the switching message; if the terminal does not receive the switching message In the switching message, after the network side device switches to the standby idle frequency point, the terminal initiates a cell selection process with stored information after experiencing a wireless link failure process.

In the above process, the handover message also carries dedicated access resource information and air interface configuration information. The information of the standby idle frequency point includes carrier frequency information and bandwidth information of the frequency point.

In the embodiment of the present invention, when the cognitive radio cellular communication system is working, the network side equipment located in the cognitive radio cellular communication system needs to perform the following processing:

(1) It is necessary to detect whether there is an authorized signal in the current working frequency point. If there is an authorized signal in the current working frequency point, in order to avoid interference with the authorized signal, the network side needs to turn off the cognitive radio cellular communication signal on the current frequency point sent.

(2) It is necessary to detect whether there are other frequency points available besides the current working frequency point (that is, whether other frequency points are not occupied).

Specifically, if it is not detected that a certain frequency point is occupied by authorized signals within a period of time, the network side device needs to use this frequency point as a spare idle frequency point. Among them, the network side device can maintain multiple spare idle frequency points, detect whether the authorization signal exists for each spare idle frequency point according to a preset period, and determine the priority of each spare idle frequency point according to the detection result (for example, priority It can be sorted according to the idle probability of the standby idle frequency points from large to small), and then sort all the standby idle frequency points according to the priority, and select the standby idle frequency point with the best priority (for example, the highest priority) as the first standby frequency point idle frequency. Of course, in practical applications, other priority idle frequency points can also be selected as the first standby idle frequency point as required (for example, a second-best priority standby idle frequency point is selected as the first standby idle frequency point), the present invention No more details will be given in the embodiments.

Further, if an authorized signal is detected at the first spare idle frequency point, it is further necessary to use a spare idle frequency point with the highest priority among the remaining spare spare frequency points as the new first spare spare frequency point.

In the embodiment of the present invention, if the authorization signal is detected on the current frequency point and the transmission of the communication signal is turned off, the working frequency point needs to be switched to the first standby idle frequency point to continue working, so as to complete the frequency switching process of the cognitive radio cellular communication system .

In addition, in order to ensure that the network-side device and the terminal can quickly establish an RRC (Radio Resource Control, radio resource control protocol) connection after the working frequency is switched to the first standby idle frequency, the network-side device needs to save every Status information (for example, packet sequence number, buffer status, etc.) and context information of each connected terminal. After switching the frequency point, once the physical layer connection is completed, the state information and context information of the connected terminal saved by the network side device can immediately restore the RRC connection of each terminal.

Based on the above situation, Embodiment 2 of the present invention provides a frequency switching method, which is applied to a radio cellular communication system. Of course, this method can also be applied to other systems or networks, and will not be described in detail in this embodiment of the present invention. . In this embodiment, it is a frequency switching method based on an existing signaling protocol. The equipment on the network side includes but is not limited to a base station, RNC (Radio Network Controller, radio network controller), etc. In the embodiment of the present invention, a base station is used as an example To illustrate, all devices located on the network side in practical applications are within the protection scope of the present invention. As shown in Figure 2, the method includes the following steps:

Step 201, if the authorization signal is detected on the current frequency point, the base station generates a dedicated handover message for each connected terminal. Wherein, the dedicated handover message is used to instruct the terminal to switch to the standby idle frequency point, and at least carries the information of the standby idle frequency point to be switched to, and the information of the standby idle frequency point includes carrier frequency information and bandwidth information of the frequency point .

In the radio cellular communication system, the base station needs to detect whether there is an authorized signal on the current operating frequency point, and if the authorized signal is detected on the current frequency point, it needs to perform the subsequent steps in the embodiment of the present invention.

Specifically, the above-mentioned exclusive handover message includes but is not limited to the carrier frequency and bandwidth information of the standby idle frequency point (that is, the carrier frequency and bandwidth information of the first standby idle frequency point or other standby idle frequency points), user-specific access Information such as resource information and air interface configuration. Wherein, the user-specific access resource information includes each user-specific random access sequence information.

By using the random access sequence information, when different terminals collectively transmit a large number of random access sequences during the random access process after the frequency switching of the base station, collisions of random access sequences of different users can be avoided, and correct sequence detection can be improved. probability and shorten the access time.

Step 202, at the current frequency point, the base station uses the signaling of the existing cellular communication system (for example, TD-LTE system) to send a dedicated There is switching news.

After the transmission of the dedicated handover message is completed, the base station needs to close the signal transmission on the current frequency point, and switch to the first standby idle frequency point, and continue to send signals.

Step 203, the terminal judges whether the exclusive handover message can be received. If the terminal can correctly receive the dedicated switching message, go to step 204; if the terminal cannot correctly receive the dedicated switching message, go to step 205.

Specifically, since the terminal may not be able to receive the dedicated handover message due to the interference of the authorization signal when receiving the dedicated handover message, the terminal needs to use the processing method in step 204 or step 205 for processing.

In step 204, the terminal executes the handover process according to the existing communication protocol according to the exclusive access resource, air interface configuration, and carrier frequency and bandwidth of the standby idle frequency point in the exclusive handover message.

Step 205, after the base station switches to the first standby idle frequency point, the terminal goes through a radio link failure process, and initiates a cell selection process with stored information.

Based on the situation of Embodiment 2 of the present invention, if the signal strength of the authorized signal detected on the current frequency point is relatively high, the terminal may not be able to correctly receive the proprietary handover message sent by the base station due to the interference of the authorized signal. To improve the reliability of frequency switching in the cognitive radio cellular communication system and reduce the switching delay, Embodiment 3 of the present invention provides a frequency switching method, which is applied to the radio cellular communication system. In this embodiment, it is necessary to modify the existing signal The command protocol, and public information such as the carrier frequency and bandwidth of the first standby idle frequency point, and the carrier frequency conversion time of the base station need to be broadcast in the system broadcast message. As shown in Figure 3, the method includes the following steps:

In step 301, the base station periodically broadcasts and sends public information such as the carrier frequency and bandwidth of the first standby idle frequency point, and the carrier frequency switching time of the base station in a system broadcast message. It should be noted that, in order to reduce the signaling overhead of the system broadcast message, the system broadcast message may not include information such as user-specific access resources and air interface configuration.

Specifically, when the base station is working normally, that is, when the base station does not detect an authorized signal on the current frequency point, the base station needs to broadcast and send the carrier frequency, bandwidth and base station carrier frequency conversion time of the first standby idle frequency point according to the preset cycle and other public information.

Step 302, the base station judges whether the authorized signal is detected on the current frequency point, if the authorized signal is detected on the current frequency point, the base station executes steps 303 and 304; if no authorized signal is detected on the current frequency point, executes Step 301.

Step 303, the base station sends a simplified dedicated handover message to each connected terminal on the dedicated control channel. Wherein, the information carried in the simplified dedicated handover message includes but not limited to user-specific access resource information and air interface configuration information.

It can be seen that compared with the dedicated handover message, the simplified dedicated handover message does not need to include the carrier frequency, bandwidth and base station carrier frequency of the first standby idle frequency point periodically broadcast in the system broadcast message when the base station is working normally. Public information such as frequency conversion time.

In step 304, the base station broadcasts carrier frequency conversion instruction information to all terminals in a system broadcast message, so as to notify all connected terminals that the base station needs to switch frequencies. Wherein, the base station carrier frequency switching instruction information can be sent using a more robust modulation and coding method than that of a dedicated handover message, thereby improving transmission reliability.

Further, when the simplified proprietary handover message is sent or the base station carrier frequency conversion indication information is sent, the base station needs to close the signal transmission on the current frequency point, switch to the first standby idle frequency point, and continue to send signals.

In the frequency switching method of this embodiment, the above processing process is the processing process on the base station side. Further, as shown in FIG. 4, the processing process on the terminal side includes the following steps:

In step 401, the terminal receives a system broadcast message from the base station when it is working normally, and obtains public information such as the carrier frequency and bandwidth of the first standby idle frequency point, and the carrier frequency conversion time of the base station from the system broadcast message.

Step 402, the terminal judges whether a simplified dedicated handover message is received. If the simplified proprietary handover message is received, go to step 403; otherwise, go to step 404.

Specifically, when the base station detects the authorization signal on the current frequency point, the base station will send a simplified dedicated handover message to each terminal in the connected state, and broadcast the base station carrier frequency switching instruction information to all terminals, and the terminal is authorized Signal interference may not correctly receive the simplified proprietary handover message, or even the base station carrier frequency switching indication information. Based on this situation, in this step, the terminal needs to judge whether it has received the simplified proprietary handover message. For terminals that can correctly receive the simplified proprietary handover message, step 403 needs to be performed, and for terminals that cannot correctly receive the simplified proprietary The terminal needs to perform step 404.

Step 403, according to the dedicated access resource and air interface configuration in the simplified dedicated handover message, as well as information such as the carrier frequency and bandwidth of the standby idle frequency point and the carrier frequency switching time of the base station obtained in the system broadcast message, the terminal follows the existing communication The protocol performs the handover process.

Step 404, the terminal judges whether the base station carrier frequency switching instruction information is received. Among them, the terminal needs to judge whether it can correctly receive the base station frequency conversion indication information broadcast in the system broadcast message. If the terminal can correctly receive the base station frequency conversion indication information in the system broadcast message, then go to step 405, and if the terminal cannot correctly receive the system frequency conversion indication information. If the base station frequency switching indication information in the broadcast message, go to step 406.

Step 405, the terminal switches the working frequency to the first standby idle frequency point, performs cell search, and accesses the base station after frequency switching.

Specifically, since the terminal has obtained the carrier frequency, bandwidth and base station carrier frequency conversion time of the standby idle frequency point in the system broadcast message during normal operation; after correctly receiving the base station frequency conversion instruction information in the system broadcast message, it can Switch the working frequency to the first standby idle frequency point.

Step 406, the terminal judges whether link failure is detected. If no link failure is detected, go to step 407, and if link failure is detected, go to step 408.

Specifically, after the base station turns off signal transmission on the current working frequency, the terminal will detect link failure on the current working frequency. Further, the cause of the link failure of the terminal may be that the base station closes signal transmission on the current working frequency, or the terminal is in a deep fading area covered by the base station.

Therefore, in order to enable the terminal to quickly switch to the first standby idle frequency point after the base station switches frequency to resume communication with the base station without affecting the link failure recovery mechanism under normal working conditions, the terminal needs to adopt this step and the following steps steps to process.

Step 407, the terminal performs a normal communication process.

Step 408, the terminal starts a timer T. Wherein, the timing length of the timer T needs to be greater than the base station carrier frequency conversion time broadcast by the base station in the system broadcast message, so as to ensure that when the terminal can switch to the first standby idle frequency point for cell search, the base station is already in the first standby idle frequency point. The frequency point sends the cell synchronization signal.

Specifically, the specific timing length of the timer T can be adjusted according to actual needs, theoretical values and test data.

Step 409, the terminal initiates a cell selection process with stored information.

Specifically, before the timer T expires, the terminal needs to implement a normal link failure recovery mechanism according to the existing communication protocol, for example, perform operations such as cell selection with stored information, RRC connection reestablishment request, and the like. However, if the RRC connection is restored again, the timer needs to be canceled.

Step 410, the terminal judges whether the timer T expires. If the timer T expires, go to step 411; otherwise, go to step 409.

Step 411 , the terminal switches the working frequency to the first standby idle frequency point according to the system broadcast message, performs cell search, and accesses the base station after frequency switching.

Specifically, since the terminal has obtained the carrier frequency, bandwidth and base station carrier frequency conversion time of the standby idle frequency point in the system broadcast message during normal operation; after correctly receiving the base station frequency conversion instruction information in the system broadcast message, it can Switch the working frequency to the first standby idle frequency point.

In summary, it can be seen that in Embodiment 3 of the present invention, the base station needs to add public information related to handover in the broadcast channel during normal operation, and needs to send simplified proprietary information to each user before frequency handover after sensing the authorized signal. Handover messages, and broadcasting base station carrier frequency conversion instruction information to all terminals, therefore, need to modify the existing cellular network communication protocol, for example, TD-LTE system.

Based on the situation of Embodiment 2 of the present invention, if the signal strength of the authorized signal detected on the current frequency point is relatively high, the terminal may not be able to correctly receive the proprietary handover message sent by the base station due to the interference of the authorized signal. To improve the reliability of frequency switching in the cognitive radio cellular communication system and reduce the switching delay, Embodiment 4 of the present invention provides a frequency switching method, which is applied to the radio cellular communication system. In this embodiment, it is necessary to modify the existing signal The command protocol, and information such as the carrier frequency and bandwidth of the first standby idle frequency point, and the carrier frequency conversion time of the base station need to be sent in the dedicated control channel. As shown in Figure 5, the method includes the following steps:

Step 501, the base station judges whether there is a terminal connected to the cognitive radio cellular communication system, if there is a terminal connected to the cognitive radio cellular communication system, go to step 502, otherwise, continue to judge whether there is a terminal connected to the cognitive radio cellular communication system .

Step 502, the base station sends information such as the carrier frequency, bandwidth, and base station carrier frequency conversion time of the first standby idle frequency point to the terminal on a dedicated control channel (non-broadcast channel).

Specifically, when the base station is working normally, that is, when the base station does not detect an authorized signal on the current frequency point, if a terminal accesses the cognitive radio cellular communication system, the base station needs to send the first Information such as the carrier frequency and bandwidth of the standby idle frequency point, and the carrier frequency conversion time of the base station.

Step 503, the base station judges whether an authorized signal is detected on the first spare idle frequency point, if an authorized signal is detected on the first spare idle frequency point, go to step 504, otherwise, continue to judge according to the preset cycle Whether an authorized signal is detected on the standby idle frequency point.

Step 504, the base station updates the first standby idle frequency point, and sends an update message of the first standby idle frequency point to each connected terminal on the dedicated control channel. The content carried in the update message includes but is not limited to the updated Carrier frequency and bandwidth information of the first standby idle frequency point.

Specifically, since the carrier frequency switching time of the base station remains unchanged after the update of the first standby idle frequency point, the update message may not need to include the carrier frequency switching time of the base station.

Step 505, the base station judges whether the authorized signal is detected on the current frequency point, if the authorized signal is detected on the current frequency point, the base station performs step 506; if the authorized signal is not detected on the current frequency point, then according to the preset Periodically continue to judge whether there is an authorized signal on the current frequency point.

Step 506, the base station sends a simplified dedicated handover message to each connected terminal on the dedicated control channel. Wherein, the information carried in the simplified dedicated handover message includes but not limited to user-specific access resource information and air interface configuration information.

It can be seen that compared with the dedicated handover message, the simplified dedicated handover message does not need to contain the carrier frequency, bandwidth and base station carrier frequency of the first standby idle frequency point periodically broadcast in the system broadcast message when the base station is working normally. Public information such as frequency conversion time.

Further, after the simplified dedicated handover message is sent, the base station needs to close the signal transmission on the current frequency point, and switch to the first standby idle frequency point, and continue to send signals.

In the frequency switching method of this embodiment, the above-mentioned processing process is a processing process on the base station side. Further, as shown in FIG. 6, the processing process on the terminal side includes the following steps:

Step 601, when the terminal accesses the cognitive radio cellular communication system, the terminal receives information such as the carrier frequency, bandwidth, and base station carrier frequency conversion time of the first standby idle frequency point sent by the base station on the dedicated control channel.

Further, when the first standby idle frequency point of the base station changes, the terminal receives the update message of the first standby idle frequency point sent by the base station on the dedicated control channel, so as to obtain the updated carrier frequency of the first standby idle frequency point ,bandwidth.

Step 602, the terminal judges whether a simplified dedicated handover message is received. If the simplified proprietary handover message is received, go to step 603; otherwise, go to step 604.

Specifically, when the base station detects the authorized signal on the current frequency point, the base station will send a simplified dedicated handover message to each connected terminal, and the terminal may not be able to correctly receive the simplified dedicated handover message due to the interference of the authorized signal . If the terminal can correctly receive the simplified dedicated handover message, go to step 603; if the terminal cannot correctly receive the simplified dedicated handover message, go to step 604.

Step 603, according to the dedicated access resource and air interface configuration in the simplified dedicated handover message, as well as information such as the carrier frequency, bandwidth and base station carrier frequency switching time of the standby idle frequency point acquired in the dedicated control channel during normal operation , execute the switching process according to the existing communication protocol.

Step 604, the terminal judges whether link failure is detected. If no link failure is detected, go to step 605, and if link failure is detected, go to step 606.

Specifically, after the base station turns off signal transmission on the current working frequency, the terminal will detect link failure on the current working frequency. Further, the cause of the link failure of the terminal may be that the base station closes signal transmission on the current working frequency, or the terminal is in a deep fading area covered by the base station.

Therefore, in order to enable the terminal to quickly switch to the first standby idle frequency point after the base station switches frequency to resume communication with the base station without affecting the link failure recovery mechanism under normal working conditions, the terminal needs to adopt this step and the following steps steps to process.

Step 605, the terminal performs a normal communication process.

Step 606, the terminal starts a timer T. Among them, the timing length of the timer T needs to be greater than the base station carrier frequency conversion time obtained by the terminal in the dedicated control channel (DCCH) during initial access, so as to ensure that the terminal can switch to the first standby idle frequency point for cell search When , the base station has already sent the cell synchronization signal at the first standby idle frequency point.

Step 607, the terminal initiates a cell selection process with stored information.

Specifically, before the timer T expires, the terminal needs to implement a normal link failure recovery mechanism according to the existing communication protocol, for example, perform operations such as cell selection with stored information, and RRC connection reestablishment request. However, if the RRC connection is restored again, the timer needs to be canceled.

Step 608, the terminal judges whether the timer T expires. If the timer T expires, go to step 609; otherwise, go to step 607.

Step 609, the terminal switches the working frequency to the first standby idle frequency point, performs cell search, and accesses the base station after frequency switching.

To sum up, it can be seen that in Embodiment 4 of the present invention, the base station needs to send the carrier frequency, bandwidth and Base station carrier frequency switching time and other information, and when the first standby idle frequency point changes, the base station also needs to send an update message of the first standby idle frequency point to each connected terminal on a dedicated control channel (non-broadcast channel) ; Before frequency switching after sensing the authorized signal, a simplified dedicated switching message needs to be transmitted to each terminal. Therefore, it is necessary to modify the existing cellular network communication protocol, for example, the TD-LTE system.

In order to illustrate the technical solution provided by the present invention more clearly, the frequency switching method proposed by the present invention will be further described below in combination with specific application scenarios. This application scenario is a frequency switching method in an LTE communication network with a cognitive radio function. Based on the processing method in Embodiment 2 of the present invention, as shown in FIG. 7, the method includes the following steps:

In step 701, the base station detects the authorized signal at the current frequency point, and determines that the working frequency needs to be switched.

In step 702, the base station selects a spare idle frequency with the highest priority as the first spare spare frequency from the spare spare spare frequencies, and uses the first spare spare spare frequency as a new working frequency after the frequency conversion of the base station.

Step 703, the base station saves the status information of PDCP (Packet data converge protocol, group data convergence protocol), RLC (Radio Link Control, radio link control protocol) and MAC (Media Access Control, media access control) of all connected terminals (for example , sequence number, Buffer status, etc.) and context information (S1 interface information, etc.).

Step 704, the base station configures a dedicated handover message for the MobilityControlInfo message of each connected terminal, encapsulates the dedicated handover message in the RRCConnectionReconfiguration message, and sends the RRCConnectionReconfiguration message to each connection through a dedicated logical channel (for example, DCCH) status terminal. Among them, the exclusive handover message includes, but is not limited to, the carrier frequency and bandwidth information of the standby idle frequency points (that is, the carrier frequency and bandwidth of the first standby idle frequency point and other standby idle frequency points), user-specific access resource information and Air interface configuration and other information.

Step 705, the base station closes signal transmission on the current frequency, and switches to the first standby idle frequency point to continue transmitting signals.

Step 706, the terminal judges whether the RRCConnectionReconfiguration message can be received. If the terminal can correctly receive the RRCConnectionReconfiguration message, perform step 707; if the terminal cannot receive the RRCConnectionReconfiguration message under the interference of the authorization signal, perform step 708.

Step 707, the terminal executes handover according to the LTE communication protocol according to information such as user-specific access resources, configuration, and carrier frequency and bandwidth of standby idle frequency points in the MobilityControlInfo message.

Step 708, after the base station switches the working frequency to the first standby idle frequency point, the terminal will experience a wireless link failure process due to being unable to receive the signal transmitted by the base station on the current frequency, and initiate a cell selection process with stored information.

For the frequency switching method in an LTE communication network with a cognitive radio function, based on the processing method in Embodiment 3 of the present invention, as shown in FIG. 8, the method includes the following steps:

Step 801, the base station broadcasts the carrier frequency, bandwidth and base station carrier frequency conversion time of the first standby idle frequency point in a system broadcast message.

Step 802, the terminal receives the system broadcast message, and acquires information such as carrier frequency, bandwidth of the first standby idle frequency point, carrier frequency switching time of the base station, and the like.

Step 803, the base station detects the authorization signal, and determines that the working frequency needs to be switched.

Step 804, the base station saves the state information and context information of PDCP, RLC and MAC of all connected terminals.

Step 805, the base station configures a simplified dedicated handover message for each connected terminal's MobilityControlInfo message, encapsulates it in the RRCConnectionReconfiguration message, and then sends the RRCConnectionReconfiguration message to each connected terminal through a dedicated logical channel (DCCH); and in the system In the broadcast message, the carrier frequency conversion instruction of the broadcast base station is broadcast. Wherein, the information carried in the simplified dedicated handover message includes but not limited to user-specific access resource information and air interface configuration information; the carrier frequency switch indication includes 1 bit information, indicating that the base station needs to switch frequency.

Step 806, the base station closes the signal transmission on the current frequency, and switches to the first standby idle frequency point to continue transmitting signals.

Step 807, the terminal judges whether the RRCConnectionReconfiguration message can be received. If the terminal can correctly receive the RRCConnectionReconfiguration message, perform step 808; if the terminal cannot receive the RRCConnectionReconfiguration message under the interference of the authorization signal, perform step 809.

Step 808, according to the user-specific access resources and air interface configuration in the MobilityControlInfo message, as well as information such as the carrier frequency, bandwidth and base station carrier frequency conversion time of the first standby idle frequency point obtained from the system broadcast message, the terminal follows the LTE communication protocol Execute the switch.

Step 809, the terminal judges whether it can correctly receive the carrier frequency switching instruction broadcast in the system broadcast message of the base station, if the terminal can correctly receive the carrier frequency switching instruction in the system broadcast message, go to step 810, if the terminal cannot correctly receive the carrier frequency switching instruction in the system broadcast message Carrier frequency conversion instruction, go to step 811.

Step 810, the terminal switches the working frequency to the first standby idle frequency point, performs cell search, and accesses the base station after frequency switching.

Specifically, since the terminal has obtained information such as the carrier frequency, bandwidth, and base station carrier frequency conversion time of the first standby idle frequency point in a system broadcast message during normal operation. When the terminal correctly receives the carrier frequency conversion instruction in the system broadcast message, it switches the working frequency to the first standby idle frequency point to perform a cell search process, and then accesses the base station after the carrier frequency conversion.

Step 811, the terminal judges whether a link failure is detected, if no link failure is detected, the normal communication process is performed, if a link failure is detected, a timer T is started (the timing length of the timer T needs to be longer than the base station at The base station carrier frequency conversion time broadcast in the system broadcast message), before the timer T times out, the terminal needs to perform a normal link failure recovery mechanism according to the existing communication protocol (for example, perform cell selection with stored information, RRC Connection re-establishment request and other operations); when the timer T expires, the terminal first performs the cell search process on the first standby idle frequency point.

For the frequency switching method in an LTE communication network with a cognitive radio function, based on the processing method in Embodiment 4 of the present invention, as shown in FIG. 9, the method includes the following steps:

Step 901, the terminal sends an access request to the base station, requesting access to the LTE communication system.

In step 902, the base station sends information such as the carrier frequency, bandwidth, and base station carrier frequency conversion time of the first standby idle frequency point to a terminal newly accessing the LTE system through a dedicated control channel (DCCH).

Step 903, when the first standby idle frequency point changes, the base station sends an update message of the first standby idle frequency point to the terminal on a dedicated control channel (DCCH). The content carried in the update message includes, but is not limited to, the updated carrier frequency and bandwidth information of the first standby idle frequency point.

Step 904, the base station detects the authorization signal on the current frequency point, and determines that the working frequency needs to be switched.

Step 905, the base station saves the state information and context information of PDCP, RLC and MAC of all connected terminals.

In step 906, the base station configures a simplified dedicated handover message in the MobilityControlInfo message of each connected terminal, encapsulates it in an RRCConnectionReconfiguration message, and then sends the RRCConnectionReconfiguration message to each connected terminal through a dedicated logical channel (DCCH).

Step 907, the base station closes signal transmission on the current frequency, and switches to the first standby idle frequency point to continue transmitting signals.

Step 908, the terminal judges whether the RRCConnectionReconfiguration message can be received. If the terminal can correctly receive the RRCConnectionReconfiguration message, perform step 909; if the terminal cannot receive the RRCConnectionReconfiguration message under the interference of the authorization signal, perform step 910.

Step 909, the terminal configures the user-specific access resources and air interface according to the MobilityControlInfo message, and obtains information such as the carrier frequency, bandwidth and base station carrier frequency conversion time of the spare idle frequency point obtained in the dedicated control channel (DCCH) during normal operation , performing handover according to the LTE communication protocol.

Step 910, the terminal judges whether a link failure is detected, and if no link failure is detected, the normal communication process is performed, and if a link failure is detected, a timer T is started (the timing length of the timer T is longer than that of the terminal at the initial The base station carrier frequency conversion time obtained in the dedicated control channel (DCCH) during access), before the timer T times out, the terminal needs to perform a normal link failure recovery mechanism according to the existing communication protocol (for example, execute Cell selection with stored information, RRC connection re-establishment request, etc.); when the timer T expires, the terminal preferentially performs the cell search process on the first standby idle frequency point.

Wherein, each step in each embodiment of the present invention can be adjusted according to actual needs.

It can be seen that by using the method provided in each embodiment of the present invention, it has the following advantages: by using cellular communication signaling, the base station and the terminal in the cognitive radio cellular communication network can simultaneously switch operating frequencies and maintain normal communication; when the terminal is authorized In the event of signal interference, the reliability of the frequency switching of the cognitive radio cellular communication network is enhanced, and the time for re-establishing communication after the system frequency switching is reduced; and the base station and terminal in the cognitive radio cellular communication network can be realized without modifying the existing cellular communication protocol. Simultaneously switch the working frequency; further, under the modification of the existing cellular communication protocol, the base station and the terminal in the cognitive radio cellular communication network can also switch the working frequency at the same time, and can further improve the reliability of the frequency switching of the cognitive radio cellular communication network, reducing The time to re-establish communication after a system frequency switch.

Based on the same inventive concept, an embodiment of the present invention also proposes a network side device, as shown in FIG. 10 , including:

The sending module 10 is configured to send a handover message for instructing the terminal to switch to an alternate idle frequency point to the terminal through a dedicated control channel when an authorization signal is detected in the current working frequency point, which carries the alternate idle frequency point to be switched to information about the point; the handover message also carries dedicated access resource information and air interface configuration information; the information about the standby idle frequency point includes carrier frequency information and bandwidth information of the frequency point.

The processing module 20 is configured to switch the working frequency to the standby idle frequency point.

The acquiring module 30 is configured to acquire the priority of each standby idle frequency point, and select a standby idle frequency point according to the priority of each standby idle frequency point; wherein, the information of the standby idle frequency point carried in the handover message is based on The information of the standby idle frequency point selected by the priority of each standby idle frequency point; the standby idle frequency point to be switched to is the standby idle frequency point selected according to the priority of each standby idle frequency point.

Based on the same inventive concept, an embodiment of the present invention also proposes a terminal, as shown in FIG. 11 , including:

The receiving module 40 is configured to receive, when the network-side device detects that there is an authorization signal in the current working frequency point, the network-side device sends a switching message to the terminal through a dedicated control channel for instructing the terminal to switch to an alternate idle frequency point, It carries the information of the standby idle frequency point to be switched to. The handover message also carries dedicated access resource information and air interface configuration information; the spare idle frequency point information includes carrier frequency information and bandwidth information of the frequency point.

A judging module 50, configured to judge whether the receiving module 40 has received the handover message.

The processing module 60 is used to execute the switching process to the spare idle frequency point according to the switching message when the judging result of the judging module 50 is that the switching message is received; when the judging result is that the switching message is not received , then after the network side device switches to the standby idle frequency point, it initiates a cell selection process with stored information after experiencing a radio link failure process.

Based on the same inventive concept, an embodiment of the present invention also proposes a network side device, as shown in FIG. 12 , including:

The sending module 70 is configured to send the information of the standby idle frequency point to the terminal, and instruct the terminal to switch to the standby idle frequency point when detecting that there is an authorization signal in the current working frequency point. The information of the standby idle frequency point includes carrier frequency and bandwidth information of the standby idle frequency point, and information about the carrier frequency switching time of the network side equipment.

The processing module 80 is configured to switch the working frequency to the standby idle frequency point.

The sending module 70 is specifically configured to broadcast the information of the standby idle frequency point to each terminal through a system broadcast message; and send a switching message to each terminal through a dedicated control channel, which carries access resource information and air interface configuration information ; and sending a system broadcast message to each terminal, which carries carrier frequency switching instruction information for instructing the terminal to switch the working frequency to an alternate idle frequency point. or,

The sending module 70 is specifically configured to, when the terminal accesses, send the information of the standby idle frequency point to the terminal through the dedicated control channel; and send information for instructing the terminal to switch to the standby idle frequency point to each terminal through the dedicated control channel. handover message, which carries access resource information and air interface configuration information. The sending module 70 is also configured to, when the network side device judges that there is an authorization signal on the standby idle frequency point, update the information of the standby idle frequency point, and send an update message to each terminal through a dedicated control channel, so The update message carries information about the updated standby idle frequency point.

Based on the same inventive concept, an embodiment of the present invention also proposes a terminal, as shown in FIG. 13 , including:

The receiving module 91 is configured to receive the information of the standby idle frequency point from the network side device, and when the network side device detects that there is an authorization signal in the current working frequency point, receive the network side device instructing the terminal to switch to the standby idle frequency point. The instruction information of the frequency point. The information of the standby idle frequency point includes carrier frequency and bandwidth information of the standby idle frequency point, and information about the carrier frequency switching time of the network side equipment.

The judging module 92 is configured to judge whether the receiving module 91 can receive the instruction information from the network side device instructing the terminal to switch to the spare idle frequency point when the network side device detects that there is an authorization signal in the current working frequency point.

The processing module 93 is configured to execute the process of switching the working frequency according to the received message when the judging result of the judging module 92 is yes.

The receiving module 91 is specifically configured to receive the information of the standby idle frequency point broadcast by the network-side device to each terminal through a system broadcast message, and receive the information sent by the network-side device to each terminal through a dedicated control channel respectively. switching message, which carries access resource information and air interface configuration information; and receives the system broadcast message sent by the network side device to each terminal, which carries a carrier frequency switching instruction for instructing the terminal to switch the working frequency to an alternate idle frequency point information;

The processing module 93 is also configured to, when receiving the switching message and the broadcast message carrying the carrier frequency switching instruction, execute the process of switching the working frequency according to the received message; when the switching message is not received, but After receiving the system broadcast message carrying the carrier frequency conversion indication information, switch the working frequency to the standby idle frequency point, perform cell search, and access the network side equipment after frequency conversion; The handover message and the system broadcast message carrying the carrier frequency conversion indication information, when a link failure is detected, first try to access the network side device after the frequency conversion by initiating a cell selection process with stored information, After the attempt fails, the working frequency is switched to the standby idle frequency point, a cell search is performed, and the network side device after frequency conversion is accessed.

The receiving module 91 is specifically configured to receive the information of the standby idle frequency point sent by the network side device to the terminal through the dedicated control channel when the terminal accesses; and receive the information sent by the network side device to the terminal through the dedicated control channel. A handover message sent by each terminal to instruct the terminal to switch to an alternate idle frequency point, which carries access resource information and air interface configuration information;

The processing module 93 is also used to, when receiving the switching message, execute the process of switching the working frequency according to the received message; when not receiving the switching message, when a link failure is detected, first try By initiating a cell selection process with stored information to access the network-side device after frequency conversion, after the attempt fails, switch the working frequency to the standby idle frequency point, perform cell search, and access to the frequency-switched device The network side device.

Further, the processing module 93 is also configured to switch the working frequency to the standby idle device after attempting to access the frequency-switched network side device by initiating a cell selection process with stored information within a set time period and fails. frequency point, perform cell search, and access to the network side device after frequency conversion.

Wherein, each module of the device of the present invention can be integrated into one body, or can be deployed separately. The above modules can be combined into one module, or can be further split into multiple sub-modules.

It can be seen that by using the equipment provided in the embodiment of the present invention, it has the following advantages: by using cellular communication signaling, the base station and the terminal in the cognitive radio cellular communication network can simultaneously switch the operating frequency and maintain normal communication; when the terminal is interfered by the authorized signal , it enhances the reliability of the frequency switching of the cognitive radio cellular communication network, reduces the time for re-establishing communication after the system frequency switching; and can realize the simultaneous switching of the base station and the terminal in the cognitive radio cellular communication network without modifying the existing cellular communication protocol Working frequency; further, under the modification of the existing cellular communication protocol, the base station and the terminal in the cognitive radio cellular communication network can also switch the operating frequency at the same time, and can further improve the reliability of the frequency switching of the cognitive radio cellular communication network and reduce the system frequency. Time to re-establish communication after switchover.

Through the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be realized by hardware, or by software plus a necessary general hardware platform. Based on this understanding, the technical solution of the present invention can be embodied in the form of software products, which can be stored in a non-volatile storage medium (which can be CD-ROM, U disk, mobile hard disk, etc.), including several The instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute the methods described in various embodiments of the present invention.

Those skilled in the art can understand that the drawing is only a schematic diagram of a preferred embodiment, and the modules or processes in the drawing are not necessarily necessary for implementing the present invention.

Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description in the embodiment, or can be located in one or more devices different from the embodiment according to corresponding changes. The modules in the above embodiments can be combined into one module, and can also be further split into multiple sub-modules.

The above serial numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.

The above disclosures are only a few specific embodiments of the present invention, however, the present invention is not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present invention.

Claims (16)

1. A method of frequency switching, comprising the steps of:

the method comprises the steps that network side equipment sends information of spare idle frequency points to a terminal, and when the network side equipment detects that authorization signals exist in current working frequency points, the network side equipment indicates the terminal to be switched to the spare idle frequency points and switches working frequencies to the spare idle frequency points;

the network side equipment sends the information of the spare idle frequency point to the terminal, and specifically comprises the following steps: the network side equipment periodically broadcasts the public information of the spare idle frequency points to each terminal in a system broadcast message;

the network side equipment instructs the terminal to switch to the spare idle frequency point, and the method comprises the following steps:

the network side equipment sends switching messages to all connected state terminals through a special control channel, wherein the switching messages carry access resource information and air interface configuration information;

and the network side equipment sends system broadcast messages to each terminal, wherein the system broadcast messages carry carrier frequency conversion indication information used for indicating the terminal to convert the working frequency to the spare idle frequency point.

2. The method of claim 1, further comprising:

if the terminal receives the switching message and the broadcast message carrying the carrier frequency switching indication, executing a working frequency switching process according to the received message;

if the terminal does not receive the switching message but receives a system broadcast message carrying carrier frequency conversion indication information, switching the working frequency to the spare idle frequency point, performing cell search, and accessing to the network side equipment after frequency conversion;

if the terminal does not receive the switching message and the system broadcast message carrying the carrier frequency conversion indication information, when a link failure is detected, firstly, the network side equipment after frequency conversion is tried to be accessed through a cell selection process initiated with the stored information, and after the attempt fails, the working frequency is switched to the spare idle frequency point, cell search is carried out, and the network side equipment after frequency conversion is accessed.

3. The method according to claim 2, wherein the network side device sends the information of the spare idle frequency points to the terminal, specifically: when the network side equipment is accessed to the terminal, the information of the spare idle frequency point is sent to the terminal through a special control channel;

the network side equipment instructs the terminal to switch to the spare idle frequency point, and the method comprises the following steps:

and the network side equipment sends a switching message for indicating the terminal to switch to the standby idle frequency point to each terminal through a special control channel, wherein the switching message carries access resource information and air interface configuration information.

4. The method of claim 3, wherein the network side device sends the information of the spare idle frequency points, and then further comprises:

and when the network side equipment judges that the standby idle frequency point has the authorization signal, updating the information of the standby idle frequency point, and sending an update message to each terminal through a special control channel, wherein the update message carries the updated information of the standby idle frequency point.

5. The method of claim 3, further comprising:

if the terminal receives the switching message, executing a working frequency switching process according to the received message;

if the terminal does not receive the switching message, when detecting the link failure, firstly trying to access the network side equipment after the frequency conversion through a cell selection process initiated with the stored information, and after the trial failure, switching the working frequency to the standby idle frequency point, performing cell search, and accessing the network side equipment after the frequency conversion.

6. The method according to claim 2 or 5, wherein the terminal, after failing to access the network side device after frequency conversion by initiating the cell selection process with the stored information within a set time period, switches the operating frequency to the standby idle frequency point, performs cell search, and accesses the network side device after frequency conversion.

7. The method of claim 1, wherein the information of the spare idle frequency point includes carrier frequency of the spare idle frequency point, bandwidth information, and information of carrier frequency conversion time of network side equipment.

8. A network-side device, comprising:

the transmitting module is used for transmitting the information of the spare idle frequency point to the terminal and indicating the terminal to switch to the spare idle frequency point when an authorization signal is detected in the current working frequency point;

the processing module is used for switching the working frequency to the spare idle frequency point;

the sending module is specifically configured to broadcast the public information of the spare idle frequency point to each terminal periodically in a system broadcast message;

respectively sending switching messages to each connected terminal through a special control channel, wherein the switching messages carry access resource information and air interface configuration information; and sending system broadcast information to each terminal, wherein the carrier frequency conversion indication information is used for indicating the terminal to convert the working frequency to the spare idle frequency point.

9. The network-side device of claim 8,

the sending module is specifically used for sending the information of the spare idle frequency points to the terminal through a special control channel when the terminal is accessed;

and sending a switching message for indicating the terminal to switch to the standby idle frequency point to each terminal through a special control channel, wherein the switching message carries access resource information and air interface configuration information.

10. The network-side device of claim 9,

the sending module is further configured to, when the network side device determines that the standby idle frequency point has the authorization signal, update information of the standby idle frequency point, and send an update message to each terminal through a dedicated control channel, where the update message carries the updated information of the standby idle frequency point.

11. The network-side device according to any one of claims 8 to 10, wherein the information of the spare idle frequency point includes carrier frequency and bandwidth information of the spare idle frequency point, and information of carrier frequency conversion time of the network-side device.

12. A terminal, comprising:

the receiving module is used for receiving information of a standby idle frequency point from network side equipment and receiving indication information for indicating that a terminal is switched to the standby idle frequency point by the network side equipment when the network side equipment detects that an authorization signal exists in a current working frequency point;

the judging module is used for judging whether the receiving module can receive the indication information of the network side equipment indicating that the terminal is switched to the standby idle frequency point or not when the network side equipment detects that the authorization signal exists in the current working frequency point;

the processing module is used for executing a working frequency switching process according to the received message when the judgment result of the judgment module is yes;

the receiving module is specifically configured to receive public information of the spare idle frequency points, which is periodically broadcast to each terminal by the network side device through a system broadcast message;

receiving switching messages which are respectively sent to all connected state terminals by the network side equipment through a special control channel, wherein the switching messages carry access resource information and air interface configuration information;

and receiving a system broadcast message sent by the network side equipment to each terminal, wherein the system broadcast message carries carrier frequency conversion indication information used for indicating the terminal to convert the working frequency to the spare idle frequency point.

13. The terminal of claim 12,

the processing module is further configured to, when receiving the switching message and the broadcast message carrying the carrier frequency switching indication, execute a process of operating frequency switching according to the received message;

when the switching message is not received but a system broadcast message carrying carrier frequency conversion indication information is received, executing switching of working frequency to the spare idle frequency point, performing cell search, and accessing to the network side equipment after frequency conversion;

when the switching message and the system broadcast message carrying the carrier frequency conversion indication information are not received, when a link failure is detected, firstly, access to the network side equipment after frequency conversion is tried in a cell selection process initiated with the stored information, and after the attempt fails, the working frequency is switched to the spare idle frequency point, cell search is carried out, and the network side equipment after frequency conversion is accessed.

14. The terminal of claim 12,

the receiving module is specifically configured to receive information of a standby idle frequency point sent to a terminal by the network side device through a dedicated control channel when the terminal is accessed;

receiving a switching message which is sent to each terminal by the network side equipment through a special control channel and is used for indicating the terminal to switch to a standby idle frequency point, wherein the switching message carries access resource information and air interface configuration information;

the processing module is further configured to, when receiving the switching message, execute a process of switching the operating frequency according to the received message;

when the switching message is not received, when a link failure is detected, firstly, the network side equipment after frequency conversion is tried to be accessed through a cell selection process initiated with stored information, and after the attempt fails, the working frequency is switched to the spare idle frequency point, cell search is carried out, and the network side equipment after frequency conversion is accessed.

15. The terminal according to claim 13 or 14,

the processing module is further configured to, after the network side device after the frequency conversion is tried to be accessed through the cell selection process initiated with the stored information fails within a set time length, switch the working frequency to the spare idle frequency point, perform cell search, and access the network side device after the frequency conversion.

16. The terminal according to any of claims 12-14, wherein the information of the spare idle frequency point includes carrier frequency of the spare idle frequency point, bandwidth information, and information of carrier frequency conversion time of network side equipment.