WO2013185582A1

WO2013185582A1 - Spectrum handoff method and equipment

Info

Publication number: WO2013185582A1
Application number: PCT/CN2013/077006
Authority: WO
Inventors: 白文岭; 李媛媛; 蒋成钢; 杨宇
Original assignee: 电信科学技术研究院
Priority date: 2012-06-14
Filing date: 2013-06-08
Publication date: 2013-12-19
Also published as: CN103491548B; CN103491548A

Abstract

Disclosed are a spectrum handoff method and equipment. The method includes: before spectrum handoff is performed in a CR system, terminal equipment and base station equipment maintaining uplink synchronization on a source operating channel; the terminal equipment acquiring an uplink resource on a target operating channel; after finding the target operating channel, the terminal equipment judging whether the uplink synchronization is maintained between itself and the base station equipment; and if the uplink synchronization is maintained between the terminal equipment and the base station equipment, the terminal equipment utilizing the uplink resource to send to the base station equipment a spectrum handoff completion message for indicating that the terminal equipment has successfully completed the spectrum handoff process.

Description

Spectrum switching method and device

Technical field

The present invention relates to the field of communications technologies, and in particular, to a spectrum switching method and device. Background of the invention

The radio communication spectrum (Spectrum) is a valuable natural resource. With the rapid development of wireless communication technology, the problem of poor spectrum resources is becoming more and more serious. After monitoring and researching the wireless communication spectrum, it was found that some channels, such as some TV channels, were not used most of the time or were not used in most areas, but in some channels. Then there is a situation in which multiple systems and multiple users compete at the same time, that is, there is an imbalance in the use of spectrum resources.

The concept of CR (Cognitive Radio) is generated in this context. The basic idea is: The CR system can monitor changes in the current wireless environment without dynamic interference to the authorization system, and dynamic opportunistic The ground (opportunistic) accesses the blank channel for communication. When the CR system opportunistically accesses the blank channel of the authorization system, the premise is that the protection authorization system service is not subject to harmful interference of the CR system, which requires: (1) The CR system has the ability to determine a blank channel, that is, to accurately determine the authorization. A blank channel in the system channel; (2) The CR system has a channel switching capability, that is, when the discovery authorization system reappears on the currently used blank channel or the currently used blank channel quality does not satisfy the CR system quality requirement, the CR system Can promptly exit the currently used blank channel.

The existing spectrum handover procedure is based on a static grant channel design. When switching between different cells, the number of terminal devices involved in the handover process is generally small. For example, some terminal devices in the RRC connected state actively initiate a handover process. The existing spectrum switching process mainly includes: the base station device sends a spectrum to the terminal device. The switching command notifies the target device of the target channel and its radio resource configuration; after receiving the spectrum switching command, the terminal device is away from the open source working channel (source channel), searches for the target working channel, and searches for the target channel. Performing random access on the target working channel, performing uplink synchronization with the base station device through a random access procedure, and transmitting a spectrum switching complete message to the base station device. The target working channel may be determined according to the target working frequency point and the predetermined bandwidth, and the source working channel may be determined according to the source working frequency point and the predetermined bandwidth.

However, in the spectrum switching process of the existing CR system, all RRC (Radio Resource Control) connected terminal devices in the entire cell are switched to the target working channel. Since there are many terminal devices in the RRC connected state in the cell, usually more than 1200, the existing spectrum switching mode is adopted, which causes a large number of terminal devices to concentrate on performing a random access process on the target working channel in a short time. This results in a higher random access failure probability and random access delay, resulting in higher spectrum handover failure probability and higher service interruption time, affecting the user experience of the CR system. Summary of the invention

The embodiment of the invention provides a spectrum switching method and device, so as to reduce the probability of spectrum switching failure and service interruption time, and improve the user experience of the CR system.

In order to achieve the above object, an embodiment of the present invention provides a spectrum switching method, where the method includes:

Before performing spectrum switching in the CR system, the terminal device and the base station device maintain uplink synchronization on the source working channel;

The terminal device acquires an uplink resource on a target working channel;

After searching for the target working channel, the terminal device determines whether the uplink synchronization is maintained between itself and the base station device; If the terminal device maintains uplink synchronization with the base station device, the terminal device sends a spectrum switching complete message to the base station device by using the uplink resource, where the spectrum switching complete message is used to indicate the terminal device. The spectrum switching completion message of the spectrum switching process has been successfully completed.

An embodiment of the present invention provides a spectrum switching method, where the method includes:

Before performing spectrum switching in the CR system, the base station device and the terminal device maintain uplink synchronization on the source working channel;

The base station device provides an uplink resource on a target working channel;

After the base station device recovers the cell in the target working channel, the base station device receives, on the target working channel, a spectrum switching complete message sent by the terminal device to the base station device by using the uplink resource.

An embodiment of the present invention provides a terminal device, including:

a management module, configured to maintain uplink synchronization on the source working channel of the maintenance terminal device and the base station device before performing spectrum switching in the CR system; and acquire uplink resources on the target working channel;

a determining module, configured to determine, after the target working channel is searched, whether uplink synchronization is maintained between the terminal device and the base station device;

a sending module, configured to send, by using the uplink resource, a spectrum switch, to indicate that the terminal device has successfully completed a spectrum switching process, when determining that the terminal device and the base station device maintain uplink synchronization Complete the message.

An embodiment of the present invention provides a base station device, including:

a management module, configured to maintain uplink synchronization between the base station device and the terminal device on the source working channel before performing spectrum switching in the CR system; and provide uplink resources on the target working channel; or, allocate the target device to the target device Upstream resources on the work channel, The uplink resource is used to enable the terminal device to send a spectrum switching complete message for indicating that the terminal device has successfully completed the spectrum switching process;

And a receiving module, configured to: after the base station device recovers the cell in the target working channel, receive, on the target working channel, a spectrum switching complete message sent by the terminal device to the base station device by using the uplink resource.

Compared with the prior art, the embodiment of the present invention has at least the following advantages: According to the embodiment of the present invention, in the spectrum switching process, the terminal device can directly adopt the pre-allocated uplink transmission mode between the terminal devices in the cell and The uplink resource sends a spectrum switching complete message to the base station device, thereby omitting the random access procedure in the spectrum switching process, avoiding the random access conflict in the CR system spectrum switching process, and then reducing the spectrum switching failure probability and service interruption of the CR system. Time has improved the user experience of the CR system. BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. One of ordinary skill in the art can also obtain other drawings based on these drawings without undue creative effort.

1 is a flow chart of implementing spectrum switching in a CR system in the prior art;

2 is a schematic flowchart of a spectrum switching method according to an embodiment of the present invention; FIG. 3 is a schematic flowchart of another spectrum switching method according to an embodiment of the present invention; FIG. FIG. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a base station device according to an embodiment of the present invention. Mode for carrying out the invention

The technical solutions in the present invention are clearly and completely described in the following with reference to the accompanying drawings in the drawings. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Figure 1 shows a flow chart of a method of switching spectrum in an existing CR system. Through this method, the continuity of the CR system business can be guaranteed. Specifically, when the spectrum is switched, the CR system can switch the entire CR system to another blank spectrum after exiting the source working channel, that is, restore the service on the target working channel.

The application scenarios of the spectrum switching method provided by the embodiments of the present invention include, but are not limited to, LTE (Long Term Evolution) and TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) using CR technology. A wireless communication system such as WCDMA (Wideband Code Division Multiple Access) or CDMA (Code Division Multiple Access)-2000.

FIG. 2 is a schematic flowchart of a spectrum switching method according to an embodiment of the present invention. As shown in Figure 2, the method includes the following steps.

Step 201: Before performing spectrum switching in the CR system, the base station device and the terminal device maintain uplink synchronization on the source working channel.

In this embodiment, the base station device includes a base station device in the CR system, and the terminal device includes a terminal device in the CR system.

In a preferred embodiment of the present invention, the base station device determines whether the terminal device maintains uplink synchronization with the base station device on the source working channel by detecting the uplink signal sent by the terminal device. If there is a synchronization deviation between the base station device and the terminal device, the base station device The terminal device sends a timing adjustment command to instruct the terminal device to perform adjustment of the uplink timing synchronization point by using the timing adjustment command. When receiving the timing adjustment command from the base station device, the terminal device performs adjustment of the uplink timing synchronization point, that is, adjusts the timing synchronization of the uplink channel/signal in the uplink transmission. After performing the foregoing processing, the base station device and the terminal device may enable the base station device and the terminal device to maintain uplink synchronization on the source working channel.

In the LTE system, the base station device determines whether the terminal device maintains uplink synchronization with the base station device on the source working channel by detecting an uplink signal sent by the terminal device. If there is a synchronization deviation between the base station device and the terminal device, the base station device sends a TAC (Timing Advanced Command) to the terminal device to indicate that the terminal device needs to perform uplink timing synchronization point adjustment through the TAC. When receiving the TAC, the terminal device adjusts the uplink timing synchronization point, that is, adjusts the timing synchronization of the uplink channel/signal in the uplink transmission, for example, adjusts the PUSCH (Physical Uplink Shared Channel) in the uplink transmission. The timing synchronization of the PUCCH (Physical Uplink Control Channel), SRS (Sounding Reference Signal), and the like, so that the base station device and the terminal device maintain uplink synchronization on the source working channel.

Step 202: The terminal device acquires an uplink resource on the target working channel.

In this step, the terminal device may agree with the base station device for the uplink resource on the target working channel; or the base station device allocates the uplink resource on the target working channel to the terminal device, and sends the uplink resource to the source working channel. The terminal device receives the uplink resource on the source working channel by the terminal device.

The uplink resource is used to enable the terminal device to send a spectrum switching complete message for indicating that the terminal device has successfully completed the spectrum switching process, and the uplink resource may be a resource such as a time-frequency code, and the uplink resource is a terminal device in the cell. There is orthogonality and no conflict between them.

In the embodiment of the present invention, the base station device and the terminal device can at least appoint an uplink resource on the target working channel by using the following manner. Base station equipment and terminal equipment are statically specified by agreement The uplink resource commitment mode of the communication system (such as the TD-SCDMA system) with the dedicated channel is specifically as follows: The dedicated channel (such as the code channel/time slot and other uplink resources) on the source working channel is statically specified by the protocol, that is, the target working channel is The dedicated channel, and the terminal device can use the dedicated channel to send a spectrum switching complete message, thereby reducing system implementation complexity and saving signaling overhead.

In the embodiment of the present invention, the base station device can send the uplink resource to the terminal device on the source working channel by using at least the following manner. Before the spectrum switching, the base station device allocates an uplink resource to the terminal device in a dynamically configured manner, and the base station device sends, on the source working channel, an air interface message such as a dedicated signaling or a system broadcast message to the terminal device, the dedicated signaling or the system broadcast message. The air interface message carries the uplink resource on the target working channel allocated by the base station device for the terminal device. Or, when the authorized user reappears on the source working channel or the channel quality of the source working channel decreases, the base station device sends a spectrum switching command to the terminal device, where the spectrum switching command includes the target working channel and/or the radio resource configuration information, and The uplink resource allocated by the base station device on the target working channel allocated by the terminal device.

In a preferred embodiment of the present invention, the base station device may also agree with the terminal device for the uplink resource and the uplink sending mode on the target working channel. Alternatively, the base station device may further allocate the uplink to the target working channel for the terminal device. And the uplink transmission mode is sent to the terminal device on the source working channel, where the uplink transmission mode includes but is not limited to: modulation coding mode, HARQ (Hybrid Auto Repeat request, hybrid automatic weight) Send request) information, power control information, etc.

In the embodiment of the present invention, the base station device and the terminal device can at least appoint an uplink resource and an uplink sending mode on the target working channel by using the following manner. The base station device and the terminal device statically specify the uplink resource and the uplink sending mode on the source working channel as the uplink resource and the uplink sending mode on the target working channel. For example, a communication that defines a dedicated channel The agreed mode of the uplink resource and the uplink transmission mode of the system (such as the TD-SCDMA system) is: statically specifying a dedicated channel on the source working channel (such as an uplink resource such as a code channel/time slot) and an uplink transmission mode by the protocol to work as a target. The dedicated channel and the uplink transmission mode on the channel, and the terminal device can use the dedicated channel and the uplink transmission mode to send the spectrum switching completion message, thereby reducing system implementation complexity and saving signaling overhead.

In the embodiment of the present invention, the base station device may send the uplink resource and the uplink sending mode to the terminal device on the source working channel by using the following manner. Before the spectrum switching, the base station device allocates the uplink resource and the uplink sending mode to the terminal device in a dynamically configured manner, and the base station device sends the air interface message such as the dedicated signaling or the system broadcast message to the terminal device on the source working channel, the dedicated signaling. Or the air interface message such as the system broadcast message carries the uplink resource and the uplink transmission mode on the target working channel allocated by the base station device for the terminal device. Or, when the authorized user reappears on the source working channel or the channel quality of the source working channel decreases, the base station device sends a spectrum switching command to the terminal device, where the spectrum switching command includes the target working channel and/or the radio resource configuration information, and The uplink resource and the uplink transmission mode of the target working channel allocated by the base station device to the terminal device. When the manner of the uplink resource is notified, there is no sequence relationship between step 201 and step 202. Step 202 may also be performed before step 201. When the method for notifying the uplink resource by using the spectrum switching command is used, step 202 is after step 201. Execute, the process is described in the next steps.

Step 203: When the base station device finds that the authorized user on the source working channel reappears or the channel quality of the source working channel decreases, the base station device determines that the spectrum switching process is performed, generates a spectrum switching command, and sends the spectrum switching command to the terminal device. The spectrum switching command includes at least a target working channel and/or radio resource configuration information.

In a preferred implementation manner of the embodiment of the present invention, the spectrum switching command may also be Indicates whether to maintain uplink synchronization between the base station device and the terminal device.

The method for determining whether the uplink synchronization is maintained between the base station device and the terminal device includes: determining, by the base station device, whether the time length between the time when the terminal device sends the spectrum switching completion message and the time when the last time the timing adjustment command is sent does not exceed the specified time threshold. According to the actual experience setting, and whether the central frequency interval between the target working channel and the source working channel does not exceed the specified frequency threshold (can be set according to actual experience); if yes, the base station device determines that the uplink synchronization is maintained between itself and the terminal device; No, the base station device determines that uplink synchronization is not maintained between itself and the terminal device.

In a preferred embodiment of the present invention, the spectrum switching command may further carry an uplink resource allocated by the base station device to the terminal working device on the target working channel; or Upstream resources and uplink transmission methods on the channel.

Step 204: After transmitting the spectrum switching command to the terminal device, the base station device stops transmitting and receiving signals on the source working channel.

Step 205: The base station device stops the cell after the signal transmission and reception of the source working channel, and uses the target working channel to recover the cell.

Step 206: After receiving the spectrum switching command, the terminal device stores or updates the uplink resource if the spectrum switching command carries the uplink resource. That is, if the current terminal device does not store the uplink resource, the uplink resource is directly stored. If the current terminal device stores the uplink resource, the currently stored uplink resource is updated.

In a preferred embodiment of the present invention, after receiving the spectrum switching command, if the terminal switching device carries the uplink resource and the uplink sending mode, the terminal device needs to store or update the uplink resource and the uplink sending mode. That is, if the current terminal device does not store the uplink resource and the uplink transmission mode, the uplink resource and the uplink transmission mode are directly stored; if the current terminal device stores the uplink resource and the uplink transmission mode, Update the currently stored uplink resources and uplink transmission mode.

Step 207: After receiving the spectrum switching command, the terminal device is away from the open source working channel, and performs downlink synchronization with the base station device on the target working channel, that is, searches for the target working channel.

It should be noted that there is no sequence relationship between step 206 and step 207. Step 207 may also be performed before step 206; and there is no sequence relationship between step 206 and step 207 and step 204 and step 205, such as steps. 207 may be located before step 204 or before step 205. Step 206 may be before step 204 or before step 205.

Step 208: After searching for the target working channel, the terminal device determines whether it maintains uplink synchronization with the base station device on the target working channel; if yes, step 209 is performed; if not, the uplink synchronization is invalid, and the uplink synchronization is required. The existing spectrum switching mode is not described in this mode.

In the embodiment of the present invention, the terminal device can determine whether the uplink synchronization is maintained on the target working channel between the self and the base station device by using at least the following manner.

Manner 1 : The time length between the time when the terminal device determines the current time or the time when the spectrum switching completion message is sent by itself, and the time when the latest uplink timing synchronization point is adjusted does not exceed the specified time threshold (according to the actual experience, it can be connected with the base station device The specified time threshold is the same, and the center frequency interval between the target working channel and the source working channel does not exceed the specified frequency threshold (according to the actual experience, it can be the same as the specified frequency threshold used by the base station equipment); If yes, the terminal device determines that the uplink synchronization is maintained between itself and the base station device; if not, the terminal device determines that the uplink synchronization is not maintained between itself and the base station device.

Manner 2: When the spectrum switching command carries the indication information of whether the uplink synchronization is maintained between the base station device and the terminal device, the terminal device receives the spectrum switching command from the base station device. Obtaining indication information about whether uplink synchronization is maintained between the base station device and the terminal device, and using the indication information to determine whether uplink synchronization is maintained between the terminal device and the base station device or uplink synchronization is not maintained.

Step 209: The terminal device sends, by using the uplink resource, a spectrum switching complete message for indicating that the terminal device has successfully completed the spectrum switching process, to the base station device.

In the embodiment of the present invention, the uplink resource is an uplink resource stored in the terminal device. The terminal device can obtain the uplink resource at least by: the terminal device and the base station device pass or, before the spectrum switching, the terminal device receives the dedicated signaling or system broadcast message from the base station device on the source working channel, and the dedicated signaling or The system broadcast message carries the uplink resource on the target working channel allocated by the base station device for the terminal device; or the terminal device receives the spectrum switching command from the base station device, and the spectrum switching command base station device allocates the target working channel for the terminal device Upstream resources.

In a preferred embodiment of the present invention, the terminal device sends the spectrum switching completion message to the base station device by using the uplink resource and the uplink sending mode, where the uplink sending mode is the uplink sending mode previously stored in the terminal device. The terminal device can obtain the uplink sending mode at least: the terminal device and the base station device receive the dedicated signaling or system broadcast message from the base station device on the source working channel before the source working channel is statically specified by the protocol, and the dedicated device receives the dedicated signaling or system broadcast message from the base station device, and the dedicated device The signaling or the system broadcast message carries the uplink transmission mode of the target working channel allocated by the base station device for the terminal device; or the terminal device receives the spectrum switching command from the base station device, and the spectrum switching command includes the base station device as the terminal device The assigned uplink transmission method on the target working channel.

Further, after the terminal device sends the spectrum switching completion message, after the base station device recovers the cell in the target working channel, the terminal device may receive the terminal device utilization on the target working channel. The spectrum switching completion message sent by the uplink resource and the uplink transmission mode to the base station device.

In summary, in the spectrum switching process provided by the embodiment of the present invention, the terminal device may directly send a spectrum switching complete message to the base station device by using the pre-assigned uplink sending mode and the uplink resource, and allocate each channel device in the cell in advance. The uplink transmission mode and the uplink resource are not conflicted, so that the random access procedure is omitted in the spectrum switching process, and the random access conflict in the CR system spectrum switching process is avoided, thereby reducing the probability of spectrum switching failure of the CR system. With the business interruption time, the user experience of the CR system is improved.

FIG. 3 is a schematic flowchart of another spectrum switching method according to an embodiment of the present invention. In the present embodiment, the processing of the base station device will be described in detail. As shown in Figure 3, the method includes the following steps.

Step 301: Before performing spectrum switching in the CR system, the base station device maintains uplink synchronization with the terminal device on the source working channel.

In a preferred embodiment of the present invention, the base station device determines whether the terminal device maintains uplink synchronization with the base station device on the source working channel by detecting the uplink signal sent by the terminal device; if there is synchronization between the base station device and the terminal device, The base station device sends a timing adjustment command to the terminal device to indicate that the terminal device needs to perform uplink timing synchronization point adjustment by using the timing adjustment command to ensure that the base station device maintains uplink synchronization with the terminal device on the source working channel.

Step 302: The base station device provides an uplink resource on the target working channel.

In this step, the base station device can agree with the terminal device for the uplink resource on the target working channel, for example, the base station device and the terminal device statically specify the uplink resource on the source working channel as the uplink resource on the target working channel; or Before the spectrum switching, the base station device allocates uplink resources on the target working channel to the terminal device in a dynamically configured manner. And notifying the uplink resource on the target working channel to the terminal device by using dedicated signaling or system broadcast message on the source working channel.

In a preferred embodiment of the present invention, the base station device may also agree with the terminal device for the uplink resource and the uplink sending mode on the target working channel, for example, the base station device and the terminal device statically specify the uplink resource on the source working channel by using a protocol. And the uplink sending mode is the uplink resource and the uplink sending mode on the target working channel; or, before the spectrum switching, the base station device allocates the uplink resource and the uplink sending mode on the target working channel to the terminal device by using dynamic configuration, and The source working channel notifies the terminal device of the uplink resource and the uplink sending manner on the target working channel by using dedicated signaling or system broadcast messages. The uplink transmission mode includes but is not limited to: a modulation and coding mode, HARQ information, power control information, and the like.

Step 303: When the base station device discovers the source working channel, that is, the authorized user reappears on the current working channel or the channel quality of the source working channel decreases, the base station device determines that the spectrum switching process needs to be performed, generates a spectrum switching command, and sends the spectrum switching command. Providing to the terminal device; wherein the spectrum switching command includes at least a target working channel and/or radio resource configuration information.

In a preferred embodiment of the present invention, the spectrum switching command may further carry indication information about whether uplink synchronization is maintained between the base station device and the terminal device.

The method for determining whether the uplink synchronization is maintained between the base station device and the terminal device includes: determining, by the base station device, whether the time length between the time when the terminal device sends the spectrum switching completion message and the time when the last time the timing adjustment command is sent does not exceed the specified time threshold. According to the actual experience,), and the center frequency interval between the target working channel and the source working channel is not exceeded. The specified frequency threshold (can be set according to actual experience); if yes, the base station device determines that the uplink synchronization is maintained between itself and the terminal device; if not, the base station device determines that the uplink synchronization is not maintained between itself and the terminal device.

In a preferred embodiment of the present invention, the spectrum switching command may further include an uplink resource that is allocated by the base station device to the terminal device, and the uplink resource may be obtained by using the base station device as the terminal device. Or, the uplink resource and the uplink transmission mode of the target working channel allocated by the base station device are carried, and the obtaining manner of the uplink resource and the uplink sending mode may be configured by the base station device as the terminal device.

It should be noted that the foregoing step 302 is an optional step. If the step 302 is not performed, in this step 303, the uplink resource on the target working channel needs to be carried in the spectrum switching command; or, on the target working channel. Uplink resources and uplink transmission methods.

Step 304: After transmitting the spectrum switching command to the terminal device, the base station device stops transmitting and receiving signals on the source working channel.

Step 305: The base station device stops the cell after the signal transmission and reception of the source working channel, and uses the target working channel to recover the cell.

Step 306: The base station device receives, on the target working channel, a spectrum switching complete message sent by the terminal device to the base station device by using the uplink resource, where the spectrum switching complete message is used to indicate that the terminal device has successfully completed the spectrum switching process. In a preferred embodiment of the present invention, the base station device receives, on the target working channel, a spectrum switching complete message sent by the terminal device to the base station device by using the uplink resource and the uplink sending mode.

FIG. 4 is a schematic flowchart of another spectrum switching method according to an embodiment of the present invention. In the present embodiment, the processing of the terminal device will be described in detail. As shown in Figure 4, the method includes the following steps.

Step 401: Before performing spectrum switching in the CR system, the terminal device maintains uplink synchronization with the base station device on the source working channel. In this embodiment, the base station device includes a base station device in the CR system, and the terminal device includes a terminal device in the CR system.

In a preferred embodiment of the present invention, the terminal device detects a timing adjustment command sent by the base station device, and performs an adjustment of the uplink timing synchronization point according to the timing adjustment command, that is, adjusts the uplink channel in the uplink transmission of the terminal device. The timing of the signals is synchronized to ensure that the terminal device maintains uplink synchronization with the base station device on the source working channel.

Step 402: The terminal device acquires an uplink resource on the target working channel.

In this step, the terminal device can agree with the base station device for the uplink resource on the target working channel. For example, the terminal device and the base station device statically specify the uplink resource on the source working channel as the uplink resource on the target working channel by using a protocol; or Before the spectrum switching, the terminal device receives the dedicated signaling or the system broadcast message from the base station device on the source working channel, and the dedicated signaling or the system broadcast message carries the uplink resource allocated by the base station device to the target working channel. .

In a preferred embodiment of the present invention, the terminal device may also agree with the base station device for the uplink resource and the uplink sending mode on the target working channel, for example, the terminal device and the base station device statically specify the uplink resource on the source working channel by using a protocol. And the uplink sending mode is an uplink resource and an uplink sending mode on the target working channel; or, before the spectrum switching, the terminal device receives the dedicated signaling or system broadcast message from the base station device on the source working channel, and the dedicated signaling or system The broadcast message carries the uplink resource and the uplink transmission mode on the target working channel allocated by the base station device for the terminal device. The uplink sending manner includes but is not limited to: a modulation and coding scheme, HARQ information, power control information, and the like.

Step 403: The terminal device receives a spectrum switching command from the base station device, where The spectrum switching command includes at least a target working channel and/or radio resource configuration information.

In an optional implementation manner of the embodiment of the present invention, the spectrum switching command may further carry indication information about whether uplink synchronization is maintained between the base station device and the terminal device.

In an optional implementation manner of the embodiment of the present invention, the spectrum switching command may further carry an uplink resource allocated by the base station device to the target working channel, or carry the target device allocated by the base station device for the terminal device. Upstream resources on the channel and uplink transmission method.

Step 404: After receiving the spectrum switching command, the terminal device stores or updates the uplink resource if the spectrum switching command carries the uplink resource. That is, if the current terminal device does not store the uplink resource, the uplink resource is directly stored; if the current terminal device stores the uplink resource, the current uplink resource is updated, and step 405 is performed; if the spectrum switching command does not carry the uplink resource Then, step 405 is directly executed.

In a preferred embodiment of the present invention, after the terminal device receives the spectrum switching command, if the spectrum switching command carries the uplink resource and the uplink sending mode, the terminal device stores or updates the uplink resource and the uplink sending mode. That is, if the uplink resource and the uplink transmission mode are not stored on the current terminal device, the uplink resource and the uplink transmission mode are directly stored. If the current terminal device stores the uplink resource and the uplink transmission mode, the current stored uplink resource and the uplink transmission are updated. the way.

Step 405: After receiving the spectrum switching command, the terminal device is away from the open source working channel, and performs downlink synchronization with the base station device on the target working channel, that is, searches for the target working channel.

Step 406: After searching for the target working channel, the terminal device determines whether it maintains uplink synchronization with the base station device on the target working channel; if yes, step 407 is performed; if not, the uplink synchronization is invalid, and the uplink synchronization is required. In the embodiment of the present invention, the terminal device can determine at least the self and the base station by using the following manners. Whether uplink synchronization is maintained between the devices on the target working channel.

Manner 1 : The terminal device determines whether the current time or the time between the time when the spectrum switching completion message is sent by itself and the time when the latest uplink timing synchronization point is adjusted does not exceed the specified time threshold (set according to actual experience), the target working channel and Whether the center frequency interval of the source working channel does not exceed the specified frequency threshold (set according to actual experience); if yes, the terminal device determines that it maintains uplink synchronization with the base station device; if not, the terminal device determines that it is not maintained between the base station device and the base station device Uplink synchronization.

Manner 2: When the spectrum switching command carries the indication information of whether the uplink synchronization is maintained between the base station device and the terminal device, the terminal device obtains, from the spectrum switching command from the base station device, whether the uplink synchronization is maintained between the base station device and the terminal device. Instructing information, and using the indication information to determine whether uplink synchronization is maintained between the terminal device and the base station device or uplink synchronization is not maintained.

Step 407: The terminal device sends, by using the uplink resource, a spectrum switching complete message for indicating that the terminal device has successfully completed the spectrum switching process, to the base station device.

In a preferred implementation manner of the embodiment of the present invention, the terminal device sends the spectrum switching complete message to the base station device by using the uplink resource and the uplink sending manner.

Based on the same inventive concept as the above method, a terminal device is also provided in the embodiment of the present invention.

FIG. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. As shown in FIG. 5, the terminal device includes a terminal management module 11, a determination module 12, and a transmission module 13.

The terminal management module 11 is configured to maintain uplink synchronization on the source working channel between the maintenance terminal device and the base station device before performing spectrum switching in the CR system. The terminal management module 11 is further configured to acquire an uplink resource on the target working channel. Specifically, the terminal management module 11 is configured to appoint an uplink resource on the target working channel with the base station device, or receive an uplink on the target working channel that is allocated by the base station device to the terminal device on the source working channel. Resources.

The determining module 12 is configured to determine whether uplink synchronization is maintained between the terminal device and the base station device after searching for the target working channel.

The sending module 13 is configured to: when the determining result is yes, send, by using the uplink resource, a spectrum switching complete message for indicating that the terminal device has successfully completed the spectrum switching process, to the base station device.

In the embodiment of the present invention, the terminal management module 11 is specifically configured to be used with the base station device. In another embodiment of the present invention, the terminal management module 11 is specifically configured to receive the source working channel from the source channel before the spectrum switching. Dedicated signaling or system broadcast message of the base station device, and the dedicated signaling or system broadcast message carries an uplink resource allocated by the base station device to the terminal device on the target working channel; or, when the source working channel is used Receiving a spectrum switching command from the base station device when the authorized user reappears or the channel quality of the source working channel decreases, the spectrum switching command includes a target working channel and/or radio resource configuration information, and the base station device is The uplink resource allocated on the target working channel allocated by the terminal device.

In the embodiment of the present invention, the terminal management module 11 is further configured to: advertise an uplink transmission mode on the target working channel with the base station device, or receive, on the source working channel, the base station device to allocate the terminal device The uplink transmission method on the target working channel. Correspondingly, the sending module 13 is specifically configured to send a spectrum switching complete message to the base station device by using the uplink resource and the uplink sending manner.

In the embodiment of the present invention, the terminal management module 11 is specifically configured to statically specify an uplink sending manner on the source working channel as an uplink sending manner on the target working channel by using the protocol with the base station device; or

Receiving a dedicated message from the base station device on the source working channel prior to spectrum switching Or the system broadcasts a message, and the dedicated signaling or system broadcast message carries an uplink sending manner on the target working channel allocated by the base station device to the terminal device; or

Receiving a spectrum switching command from the base station device when the authorized user reappears on the source working channel or the channel quality of the source working channel is decreased, where the spectrum switching command includes the target working channel and/or the radio resource configuration information, and the The uplink transmission mode allocated by the base station device to the terminal device on the target working channel.

In the embodiment of the present invention, the determining module 12 is specifically configured to determine whether the current time or the time between the time when the terminal device sends the spectrum switching complete message and the time when the last time the uplink timing synchronization point is adjusted does not exceed the specified time threshold, and Whether the center frequency interval between the target working channel and the source working channel does not exceed the specified frequency threshold; if yes, determining that the uplink synchronization is maintained between the terminal device and the base station device; if not, determining between the terminal device and the base station device Uplink synchronization is not maintained. In the embodiment of the present invention, the determining module 12 is specifically configured to: when the authorized user reappears on the source working channel or the channel quality of the source working channel decreases, receive a spectrum switching command from the base station device, where the spectrum switching command includes The target working channel and/or the radio resource configuration information, and the indication information of whether the uplink synchronization is maintained between the base station device and the terminal device; and determining, by using the indication information carried in the spectrum switching command, the terminal device The base station device maintains uplink synchronization or does not maintain uplink synchronization.

The modules of the terminal device provided by the embodiments of the present invention may be integrated into one or may be deployed separately. The above modules can be combined into one module, or further divided into multiple sub-modules.

Based on the same inventive concept as the above method, a base station device is also provided in the embodiment of the present invention.

FIG. 6 is a schematic structural diagram of a base station device according to an embodiment of the present invention. As shown in Figure 6 The base station device includes a base station management module 21 and a receiving module 22.

The base station management module 21 is configured to maintain the uplink synchronization of the base station device and the terminal device on the source working channel before performing spectrum switching in the CR system. The base station management module 21 is also used to provide uplink resources on the target working channel. Specifically, the base station management module 21 is configured to appoint an uplink resource on the target working channel with the terminal device; or, allocate the uplink resource on the target working channel to the terminal device, and set the uplink resource on the source working channel. The uplink resource is sent to the terminal device, where the uplink resource is used to enable the terminal device to send a spectrum switching complete message for indicating that the terminal device has successfully completed the spectrum switching process.

The receiving module 22 is configured to: after the base station device recovers the cell in the target working channel, receive, on the target working channel, a spectrum switching complete message sent by the terminal device to the base station device by using the uplink resource.

In the embodiment of the present invention, the base station management module 21 is specifically configured to be used with the terminal device. In another embodiment of the present invention, the base station management module 21 is specifically configured to use the source working channel on the source working channel before the spectrum switching. The device sends a dedicated signaling or a system broadcast message, and the dedicated signaling or system broadcast message carries an uplink resource allocated by the base station device to the terminal device on the target working channel; or, when authorized on the source working channel When the user reappears or the channel quality of the source working channel decreases, a spectrum switching command is sent to the terminal device, where the spectrum switching command includes a target working channel and/or radio resource configuration information, and the base station device is the terminal. The uplink resource allocated by the device on the target working channel.

In the embodiment of the present invention, the base station management module 21 is further configured to: agree with the terminal device to send an uplink sending manner on a target working channel; or, allocate, to the terminal device, an uplink sending manner on a target working channel, and The uplink sending mode is sent on the source working channel. To the terminal device. Correspondingly, the receiving module 22 is specifically configured to receive, on the target working channel, a spectrum switching complete message sent by the terminal device to the base station device by using the uplink resource and the uplink sending manner.

In the embodiment of the present invention, the base station management module 21 is further configured to perform a transmission manner with the terminal device; or

Before the spectrum switching, the dedicated signaling or system broadcast message is sent to the terminal device on the source working channel, and the dedicated signaling or system broadcast message carries the target work assigned by the base station device to the terminal device. The uplink transmission mode on the channel; or, when the authorized user reappears on the source working channel or the channel quality of the source working channel decreases, the spectrum switching command is sent to the terminal device, where the spectrum switching command includes the target working channel and/or Or radio resource configuration information, and an uplink transmission manner on the target working channel allocated by the base station device to the terminal device.

In the embodiment of the present invention, the base station management module 21 is further configured to generate a spectrum switching command when the authorized user reappears on the source working channel or the channel quality of the source working channel decreases, and send the spectrum switching command to the terminal. The device includes: the target working channel and/or the radio resource configuration information, and the indication information of whether the uplink synchronization is maintained between the base station device and the terminal device.

In the embodiment of the present invention, the base station management module 21 is further configured to determine whether the uplink synchronization is maintained between the base station device and the terminal device by: determining that the terminal device sends the spectrum switching complete message at the time of the last transmission. Whether the length of time between timings of timing adjustment commands does not exceed a specified time threshold, and whether the center frequency interval between the target working channel and the source working channel does not exceed a specified frequency threshold; if yes, determining the base station device and the terminal device Uplink synchronization is maintained between; if not, it is determined that uplink synchronization is not maintained between the base station device and the terminal device. The modules of the base station device of the present invention may be integrated into one or may be deployed separately. The above modules can be combined into one module, or can be further split into multiple sub-modules.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for making a A computer device (which may be a personal computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention.

A person skilled in the art can understand that the drawings are only a schematic diagram of a preferred embodiment, and the modules or processes in the drawings are not necessarily required to implement the invention.

Those skilled in the art can understand that the modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the embodiment, or may be changed in one or more apparatuses different from the embodiment. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

The above disclosure is only a few specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.

Claims

Claim

A spectrum switching method, the method comprising:

Before performing spectrum switching in the cognitive radio system, the terminal device and the base station device maintain uplink synchronization on the source working channel;

The terminal device acquires an uplink resource on a target working channel;

After detecting the target working channel, the terminal device determines whether uplink synchronization is maintained between the terminal device and the base station device;

If the terminal device maintains uplink synchronization with the base station device, the terminal device sends a spectrum switching complete message to the base station device by using the uplink resource, where the spectrum switching complete message is used to indicate the terminal device. The spectrum switching process has been successfully completed.

The method according to claim 1, wherein the acquiring, by the terminal device, the uplink resource on the target working channel comprises:

The terminal device and the base station device appoint an uplink resource on the target working channel; or the terminal device receives, on the source working channel, the uplink resource that is allocated by the base station device to the target working channel on the target working channel. .

The method according to claim 2, wherein the terminal device and the base station device agree on uplink resources on the target working channel, including:

The terminal device and the base station device statically specify an uplink resource on the source working channel as an uplink resource on the target working channel by using a protocol.

The method of claim 2, wherein the receiving, by the terminal device, the uplink resource on the target working channel allocated by the base station device to the terminal device on the source working channel, includes:

Before the spectrum switching, the terminal device receives a dedicated signaling or system broadcast message from the base station device on the source working channel, and the dedicated signaling or system broadcast message Carrying an uplink resource that is allocated by the base station device to the terminal device on a target working channel; or

When the authorized user reappears on the source working channel or the channel quality of the source working channel decreases, the terminal device receives a spectrum switching command from the base station device, where the spectrum switching command includes a target working channel and/or a radio resource configuration. Information, and an uplink resource allocated by the base station device to the terminal device on a target working channel.

The method according to claim 2, wherein the method further comprises: the terminal device and the base station device agreeing to an uplink sending mode on a target working channel; or the terminal device working at a source Receiving, on the channel, an uplink sending manner of the target working channel allocated by the base station device to the terminal device; and

The terminal device sends a spectrum switching complete message to the base station device by using the uplink resource and the uplink sending manner.

The method according to claim 5, wherein the terminal device and the base station device agree on an uplink sending manner on a target working channel, including:

The terminal device and the base station device statically specify that the terminal device on the source working channel receives the uplink sending mode on the target working channel allocated by the base station device for the terminal device on the source working channel, Includes:

Before the spectrum switching, the terminal device receives the dedicated signaling or system broadcast message from the base station device on the source working channel, and the dedicated signaling or system broadcast message carries the base station device as the terminal device. The assigned uplink transmission mode on the target working channel; or,

When the authorized user reappears on the source working channel or the channel quality of the source working channel decreases, the terminal device receives a spectrum switching command from the base station device, where the spectrum switching command includes a target working channel and/or a radio resource configuration. Information, and the base station device The uplink transmission mode allocated on the target working channel allocated to the terminal device.

The method according to claim 1, wherein the determining, by the terminal device, whether the uplink synchronization is maintained between the self and the base station device includes:

The terminal device determines whether the current time or the time between the time when the spectrum switching completion message is sent by itself and the time when the uplink timing synchronization point is adjusted last time does not exceed the specified time threshold, and the center frequency of the target working channel and the source working channel Whether the interval does not exceed the specified frequency threshold; if yes, determining that the uplink synchronization is maintained between itself and the base station device; if not, determining that the uplink synchronization is not maintained between the self and the base station device; or

When the authorized user reappears on the source working channel or the channel quality of the source working channel decreases, the terminal device receives a spectrum switching command from the base station device, where the spectrum switching command includes a target working channel and/or a radio resource configuration. Information, and indication information of whether the uplink synchronization is maintained between the base station device and the terminal device; and the terminal device determines, by using the indication information carried in the spectrum switching command, the terminal device and the base station device Maintain uplink synchronization or maintain uplink synchronization.

8. A spectrum switching method, characterized in that the method comprises:

Before performing spectrum switching in the cognitive radio system, the base station device and the terminal device maintain uplink synchronization on the source working channel;

The method according to claim 8, wherein the uplink resource provided by the base station device on the target working channel comprises:

The base station device and the terminal device agree on an uplink resource on a target working channel; Or, the base station device allocates, by the base station device, the uplink replenishment uplink resource on the target working channel, to enable the terminal device to send a spectrum switching complete message for indicating that the terminal device has successfully completed the spectrum switching process.

The method according to claim 9, wherein the base station device and the terminal device appoint an uplink resource on the target working channel, including:

The base station device and the terminal device statically specify an uplink resource on the source working channel as an uplink resource on the target working channel by using a protocol.

The method according to claim 9, wherein the base station device sends a dedicated signaling or a system broadcast message to the terminal device on a source working channel before the source device operates in a spectrum switch. And the dedicated signaling or the system broadcast message carries the uplink resource allocated by the base station device to the terminal device on the target working channel; or

When the authorized user reappears on the source working channel or the channel quality of the source working channel decreases, the base station device sends a spectrum switching command to the terminal device, where the spectrum switching command includes the target working channel and/or the radio resource configuration information. And an uplink resource allocated by the base station device to the terminal device on a target working channel.

The method according to claim 9, wherein the method further comprises: the base station device and the terminal device agreeing to an uplink transmission mode on a target working channel; or The terminal device allocates an uplink device on the target working channel; and the base station device receives, on the target working channel, a spectrum switching complete message sent by the terminal device to the base station device by using the uplink resource and the uplink sending manner.

The method according to claim 12, wherein said base station device and said The terminal device stipulates an uplink sending manner on the target working channel, and the method includes: the base station device and the terminal device statically specifying an upper working channel on a working channel

Equipment, including:

Before the spectrum switching, the base station device sends a dedicated signaling or a system broadcast message to the terminal device on the source working channel, and the dedicated signaling or system broadcast message carries the base station device to allocate the terminal device Uplink transmission method on the target working channel; or,

When the authorized user reappears on the source working channel or the channel quality of the source working channel decreases, the base station device sends a spectrum switching command to the terminal device, where the spectrum switching command includes the target working channel and/or the radio resource configuration information. And an uplink sending manner on the target working channel allocated by the base station device to the terminal device.

The method according to claim 8, wherein the method further comprises: when the authorized user reappears on the source working channel or the channel quality of the source working channel decreases, the base station device generates a spectrum switching command, and The spectrum switching command is sent to the terminal device, where the spectrum switching command includes a target working channel and/or radio resource configuration information, and an indication of whether uplink synchronization is maintained between the base station device and the terminal device. information.

The method according to claim 14, wherein the determining whether the base station device and the terminal device maintain uplink synchronization comprises:

The base station device determines whether the time length between the time when the terminal device sends the spectrum switching complete message and the time when the last time the timing adjustment command is sent does not exceed the specified time threshold, and the center frequency interval between the target working channel and the source working channel is Not exceeding the specified frequency threshold; if yes, the base station device determines that it maintains with the terminal device Uplink synchronization; if not, the base station device determines that uplink synchronization is not maintained between itself and the terminal device.

16. A terminal device, comprising:

a terminal management module, configured to maintain uplink synchronization between the terminal device and the base station device on the source working channel before performing spectrum switching in the cognitive radio system; and acquire uplink resources on the target working channel;

The terminal device according to claim 16, wherein the terminal management module is configured to agree with an uplink resource on a target working channel with the base station device when acquiring an uplink resource on a target working channel; or And receiving, on the source working channel, an uplink resource that is allocated by the base station device to the terminal device on a target working channel.

The terminal device according to claim 17, wherein

The terminal management module is specifically configured to statically specify a source by using a protocol with the base station device.

The terminal device according to claim 17, wherein

The terminal management module is configured to receive a dedicated signaling or a system broadcast message from the base station device on a source working channel before the spectrum switching, and the dedicated signaling or system broadcast message carries the base station device Receiving an uplink resource on the target working channel allocated to the terminal device; or receiving a spectrum switching command from the base station device when an authorized user on the source working channel reappears or the channel quality of the source working channel is degraded, The spectrum switching command includes the target working channel and/or radio resource configuration information, and the An uplink resource allocated by the base station device to the terminal device on a target working channel.

The terminal device according to claim 17, wherein

The terminal management module is further configured to: appoint an uplink transmission mode on the target working channel with the base station device; or receive, on the source working channel, the target working channel allocated by the base station device to the terminal device Uplink transmission method;

The sending module is specifically configured to send a spectrum switching complete message to the base station device by using the uplink resource and the uplink sending manner.

The terminal device according to claim 20, wherein

The terminal management module is further configured to statically stipulate a protocol with the base station device,

Receiving a dedicated signaling or system broadcast message from the base station device on a source working channel before the spectrum switching, and the dedicated signaling or system broadcast message carries the target device allocated by the base station device to the terminal device Uplink sending method on the working channel; or,

The terminal device according to claim 16, wherein

The determining module is specifically configured to determine whether the current time or the time between the time when the terminal device sends the spectrum switching completion message and the time when the latest uplink timing synchronization point is adjusted does not exceed the specified time threshold, and the target working channel and the source Whether the center frequency interval of the working channel does not exceed the specified frequency threshold; if yes, determining that the uplink synchronization is maintained between the terminal device and the base station device; if not, determining the terminal device and the base station device The uplink synchronization is not maintained; or, when the authorized user reappears on the source working channel or the channel quality of the source working channel decreases, receiving a spectrum switching command from the base station device, where the spectrum switching command includes the target working channel and And the radio resource configuration information, and the indication information of whether the uplink synchronization is maintained between the base station device and the terminal device; and determining, by using the indication information carried in the spectrum switching command, the terminal device and the base station device The uplink synchronization is maintained or the uplink synchronization is not maintained.

A base station device in a cognitive radio system, comprising: a base station management module, configured to maintain uplink synchronization on a source working channel of a base station device and a terminal device before performing spectrum switching in a cognitive radio system And providing an uplink resource on the target working channel; preparing a spectrum switching completion message that has successfully completed the spectrum switching process;

The base station device according to claim 23, wherein the base station management module provides uplink resources on the target working channel for the uplink resources on the target working channel with the terminal device; or And allocating an uplink resource on the target working channel to the terminal device, and sending the uplink resource to the terminal device on the source working channel.

The base station device according to claim 24, characterized in that

The base station management module is specifically configured to statically specify a source by using a protocol with the terminal device.

The base station device according to claim 24, wherein

The base station management module is specifically configured to: before the spectrum switching, on the source working channel The terminal device sends a dedicated signaling or a system broadcast message, and the dedicated signaling or system broadcast message carries an uplink resource that is allocated by the base station device to the terminal device on a target working channel; or, when the source works When the authorized user reappears on the channel or the channel quality of the source working channel decreases, the spectrum switching command is sent to the terminal device, where the spectrum switching command includes the target working channel and/or the radio resource configuration information, and the base station device is The uplink resource allocated by the terminal device on the target working channel.

The base station device according to claim 24, wherein

The base station management module is further configured to: appoint an uplink transmission mode on the target working channel with the terminal device; or allocate an uplink device on the target working channel to the terminal device;

And the receiving module is configured to receive, on the target working channel, a spectrum switching completion message that is sent by the terminal device to the base station device by using the uplink resource and the uplink sending manner.

The base station device according to claim 27, wherein

The base station management module is further configured to statically stipulate a protocol with the terminal device,

The base station device according to claim 23, characterized in that

The base station management module is further configured to: when the authorized user reappears on the source working channel or the channel quality of the source working channel decreases, generate a spectrum switching command, and send the spectrum switching command to the terminal device; The handover command includes the target working channel and/or the radio resource configuration information, and the indication information of whether the uplink synchronization is maintained between the base station device and the terminal device.

The base station device according to claim 29, characterized in that

The base station management module is further configured to determine whether uplink synchronization is maintained between the base station device and the terminal device by:

Determining whether the time length between the time when the terminal device sends the spectrum switching completion message and the time when the last time the timing adjustment command is sent does not exceed the specified time threshold, and whether the center frequency interval between the target working channel and the source working channel does not exceed the specified frequency a threshold; if yes, determining that uplink synchronization is maintained between the base station device and the terminal device; if not, determining that uplink synchronization is not maintained between the base station device and the terminal device.