CN102457922A - Method, system and device for switching frequency of cell - Google Patents
Method, system and device for switching frequency of cell Download PDFInfo
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Abstract
The invention discloses a method, a system and a device for switching the frequency of a cell. According to the method, the system and the device, the quick switch of user equipment to cells corresponding to other frequency bands is realized when master user access to the current work cognitive frequency band of the user equipment is detected. The method for switching the frequency of the cell, which is provided by the invention, comprises the following steps of: informing the user equipment which is established on the current cognitive frequency band and is in the cell of candidate frequency band list information by a network side, wherein the candidate frequency band list information comprises a group of candidate frequency bands and the priority corresponding to each candidate frequency band; and when the master user access to the current work cognitive frequency band is detected by the network side, stopping signal transmission in the current cognitive frequency band and selecting the candidate frequency band according to the priority and reestablishing the cell.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, a system, and an apparatus for cell frequency switching.
Background
With the development of the International Telecommunications Union (ITU) -Advanced International Mobile Telecommunications (IMT-a) technical scheme gathering work, the general direction of the 4G technology is basically clear. Compared with the 3G system, the 4G system design provides higher targets, including providing higher peak rate, supporting higher transmission bandwidth, reducing time delay, and the like, and providing better service. The use of new technologies such as Multiple Input Multiple Output (MIMO) has further improved the spectrum utilization, but these cannot fundamentally solve the problem of limited spectrum resources.
The wireless spectrum, a precious natural resource, is certainly limited. With the rapid development of mobile communication technology, the contradiction between the increasing broadband wireless communication demand and the limited spectrum resource is becoming more and more obvious, although the available frequency is higher and higher through the technological progress, the demand still cannot be met, and in view of the signal propagation characteristic, the lower frequency band has the advantage that the high frequency cannot be compared with. While on the one hand there is a shortage and shortage of spectrum resources, on the other hand there are many spectrum resources that have been allocated to existing wireless systems that are idle to varying degrees in time and space. The method is mainly determined by the existing spectrum management and allocation policies, that is, the spectrum resource allocation mode is relatively fixed and cannot be adjusted according to the requirements in a fast and self-adaptive manner.
In this context, Cognitive Radio (CR) technology is receiving attention, and its basic idea is: under the premise of not generating harmful interference on authorized users or other unauthorized users with frequency spectrums, a cognitive user accesses an authorized user frequency band or an unauthorized frequency band in an opportunity selection (opportunistic) mode; or, a mode of a public resource pool is adopted, so that a plurality of systems can share the frequency spectrum, and the utilization efficiency of the frequency spectrum is improved. The appearance of the cognitive radio technology provides powerful technical support for solving the problem of insufficient frequency spectrum resources, realizing dynamic frequency spectrum management and improving the frequency spectrum utilization rate.
However, in the prior art, a mobile communication system, such as an LTE system, is designed based on being deployed in a stable licensed frequency band, and does not consider the requirement that an operating frequency band of the system is based on a cognitive unstable frequency band. If the mobile communication system and the user equipment deployed in the cognitive frequency band completely work according to the existing process, the performance index requirements of the cognitive system cannot be met. For example, when a primary user signal in the cognitive band is a continuous signal with high power, such as a broadcast television signal, the primary user starts operating, which may cause a mobile communication system operating in the cognitive band to receive strong signal interference, and even a User Equipment (UE) cannot receive any signal of a network. Therefore, the conventional cell handover procedure cannot be completed. In addition, because the cognitive mobile communication system has no stable authorized frequency band, when a master user signal appears on the cognitive frequency band, the UE cannot know other frequency bands, so that the UE needs to consume a large amount of time for cell scanning in a large frequency band range, and a new cell established by the network in other frequency bands is likely to be found, thereby causing the service interruption time of the user equipment to be too long.
In summary, in the prior art, when it is detected that a master user accesses a cognitive frequency band in which the user equipment currently operates, the user equipment cannot be quickly switched to other cells.
Disclosure of Invention
The embodiment of the invention provides a cell frequency switching method, a system and a device, which are used for realizing the fast switching of user equipment to cells corresponding to other frequency bands when detecting that a master user is accessed to the cognitive frequency band of the current work of the user equipment.
The cell frequency switching method provided by the embodiment of the invention comprises the following steps:
the network side informs the user equipment in a cell established on the current cognitive frequency band of candidate frequency band list information, wherein the candidate frequency band list information comprises a group of candidate frequency bands and the corresponding priority of each candidate frequency band;
and when detecting that a master user accesses the current cognitive frequency band, the network side stops signal transmission on the current cognitive frequency band, selects a candidate frequency band according to the priority and reestablishes the cell.
The cell frequency switching method provided by the embodiment of the invention comprises the following steps:
acquiring candidate frequency band list information sent by a network side by user equipment residing in a cell established on a current cognitive frequency band, wherein the candidate frequency band list information comprises a group of candidate frequency bands and a priority corresponding to each candidate frequency band;
and when determining that a master user accesses the current cognitive frequency band, the user equipment selects a candidate frequency band according to the priority and resides in a cell corresponding to the selected candidate frequency band.
The network device provided by the embodiment of the invention comprises:
a candidate frequency band list information notification unit, configured to notify candidate frequency band list information to user equipment in a cell established on a current cognitive frequency band, where the candidate frequency band list information includes a group of candidate frequency bands and a priority corresponding to each candidate frequency band;
and the cell frequency switching unit is used for stopping signal transmission on the current cognitive frequency band when detecting that a master user accesses the current cognitive frequency band, selecting a candidate frequency band according to the priority and reestablishing the cell.
The user equipment provided by the embodiment of the invention comprises:
a candidate frequency band list information obtaining unit, configured to obtain candidate frequency band list information sent by a network side, where the candidate frequency band list information includes a group of candidate frequency bands and a priority corresponding to each candidate frequency band;
and the cell frequency switching unit is used for selecting a candidate frequency band according to the priority when the fact that a master user accesses the cognitive frequency band of the current work of the user equipment is determined, and realizing the equipment to reside in the cell corresponding to the selected candidate frequency band.
The communication system provided by the embodiment of the invention comprises:
the network equipment is used for notifying the user equipment in the cell established on the current cognitive frequency band of candidate frequency band list information, wherein the candidate frequency band list information comprises a group of candidate frequency bands and the priority corresponding to each candidate frequency band; when a master user is detected to be accessed in the current cognitive frequency band, stopping signal transmission in the current cognitive frequency band, selecting a candidate frequency band according to the priority and reestablishing a cell;
the user equipment is used for acquiring candidate frequency band list information sent by the network equipment; and when determining that a master user accesses the current cognitive frequency band, selecting a candidate frequency band according to the priority, and residing in a cell corresponding to the selected candidate frequency band.
In the embodiment of the invention, the network side informs the user equipment in the cell established on the current cognitive frequency band of the candidate frequency band list information, wherein the candidate frequency band list information comprises a group of candidate frequency bands and the corresponding priority of each candidate frequency band; when detecting that a master user accesses the current cognitive frequency band, the network side stops signal transmission on the current cognitive frequency band, selects the candidate frequency band according to the priority corresponding to the candidate frequency band and reestablishes the cell, so that when detecting that the master user accesses the cognitive frequency band of the current work of the user equipment, the user equipment can be quickly switched to the cell corresponding to other frequency bands.
Drawings
Fig. 1 is a flowchart illustrating a cell frequency switching method according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a cell frequency switching method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a communication system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a network device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a cell frequency switching method, a system and a device, which are used for realizing the fast switching of user equipment to cells corresponding to other frequency bands when detecting that a master user is accessed to the cognitive frequency band of the current work of the user equipment.
The embodiment of the invention considers the combination of the cognitive radio technology and a mobile communication system (such as an LTE system), when the mobile communication system is deployed in a cognitive frequency band (an unauthorized frequency band), the communication of an authorized user is ensured not to be influenced as much as possible according to requirements, when the authorized user is detected, the mobile communication system needs to rapidly quit the cognitive frequency band, a new frequency band is selected to establish a cell, and the user is also required to be rapidly switched to the newly established cell in the process, so that the service continuity of the user is ensured.
An existing mobile communication system, for example, an LTE system, is designed based on deployment in a stable licensed frequency band, and does not consider the requirement that an operating frequency band of the system is based on a cognitive unstable frequency band. According to the requirement of deploying an LTE system in a cognitive frequency band, a network needs to rapidly quit the cognitive frequency band of work when a main user signal of the cognitive frequency band appears, a cell is rapidly established on another available frequency band, users in current service are rapidly switched to the newly established cell, and meanwhile, the service interruption time of the users is ensured to be within the order of 1 second(s).
The technical scheme provided by the embodiment of the invention is mainly characterized in that when the network side works in the current cognitive frequency band, a priority list of other available frequency bands (preferably the cognitive frequency band, and certainly other frequency bands) is maintained and issued to the user equipment, and after the wireless link of the user equipment in the original frequency band cell fails due to the occurrence of a master user signal, the user equipment performs cell selection on the basis of the priority list sequence, so that the user equipment can quickly establish connection with the network on the new cognitive frequency band and recover the service.
The technical solution provided by the embodiment of the present invention is explained below with reference to the accompanying drawings.
On the network side, referring to fig. 1, a cell frequency switching method provided in an embodiment of the present invention includes the steps of:
s101, a network side informs user equipment in a cell established on a current cognitive frequency band of candidate frequency band list information, wherein the candidate frequency band list information comprises a group of candidate frequency bands and priorities corresponding to the candidate frequency bands.
The set of candidate bands may be one candidate band or multiple candidate bands.
Preferably, the candidate frequency band according to the embodiment of the present invention is a cognitive frequency band.
S102, when detecting that a master user accesses the current cognitive frequency band, the network side stops signal transmission on the current cognitive frequency band, selects a candidate frequency band according to the priority of the candidate frequency band and reestablishes a cell.
Preferably, the step of determining the candidate band list information by the network side includes:
and the network side detects the interference level of the cognitive frequency bands except the current cognitive frequency band in real time, selects a group of candidate cognitive frequency bands according to a preset principle and determines the priority corresponding to each candidate cognitive frequency band according to the detection result, and generates candidate frequency band list information.
Preferably, the method further comprises:
when the candidate frequency band list information changes, the network side informs the changed candidate frequency band list information to user equipment in a cell established on the current cognitive frequency band.
Preferably, the method further comprises:
and the network side informs the cell configuration information corresponding to the candidate frequency band to the user equipment in the cell established on the current cognitive frequency band.
Preferably, the step of notifying, by the network side, the candidate frequency band list information to the user equipment in the cell established on the current cognitive frequency band includes:
the network side notifies the candidate frequency band list information to the user equipment in the cell established on the current cognitive frequency band through a System Information Block (SIB) message or a radio link control (RRC) signaling dedicated to the user equipment.
On the user equipment side, referring to fig. 2, a cell frequency switching method provided in an embodiment of the present invention includes the steps of:
s201, acquiring candidate frequency band list information sent by a network side, where the candidate frequency band list information includes a group of candidate frequency bands and a priority corresponding to each candidate frequency band, by a user equipment residing in a cell established on a current cognitive frequency band.
S202, when the situation that the wireless link failure occurs in the cell established on the current cognitive frequency band is determined, the user equipment residing in the cell established on the current cognitive frequency band selects the candidate frequency band according to the priority and resides in the cell corresponding to the selected candidate frequency band.
Preferably, the method further comprises:
and when the candidate frequency band list information changes, the user equipment acquires the changed candidate frequency band list information sent by the network side.
Preferably, the method further comprises:
and the user equipment acquires cell configuration information corresponding to each candidate frequency band sent by the network side.
Preferably, the step of the user equipment residing in the cell corresponding to the selected candidate frequency band includes:
the user equipment executes a radio link control (RRC) connection reestablishment process in a cell corresponding to the selected candidate frequency band; or,
and the user equipment establishes uplink synchronization in the cell corresponding to the selected candidate frequency band according to the cell configuration information corresponding to the selected candidate frequency band.
To sum up, the technical solution provided by the embodiment of the present invention specifically includes:
the method comprises the following steps: the network side establishes a cell in the currently available cognitive frequency band to provide network connection and data transmission service for the user equipment.
Step two: and the network side detects the interference level on other cognitive frequency bands in real time, and selects and maintains a group of candidate cognitive frequency bands and corresponding priorities thereof according to a set principle.
The interference level detection may be a periodic or aperiodic measurement.
The selecting a group of candidate cognitive frequency bands according to a set principle comprises:
selecting a group of candidate cognitive frequency bands with lower interference level; or,
selecting a group of candidate cognitive frequency bands with low occurrence frequency of the master user signal according to historical information; or,
and selecting a group of candidate cognitive frequency bands with short occurrence time duration of the main user signal.
Similarly, the priority ranking principle for the candidate cognitive frequency bands includes:
according to the detected interference level, setting the candidate cognitive frequency band with lower interference level as the candidate cognitive frequency band with high priority, and otherwise, setting the candidate cognitive frequency band with low priority; or,
setting a candidate cognitive frequency band with lower occurrence frequency of a master user signal as a candidate cognitive frequency band with high priority according to historical information, and otherwise, setting the candidate cognitive frequency band as a candidate cognitive frequency band with low priority; or,
and setting the candidate cognitive frequency band with short occurrence duration of the main user signal as a high-priority candidate cognitive frequency band according to the historical information, and otherwise, setting the candidate cognitive frequency band as a low-priority candidate cognitive frequency band.
Step three: and the network side issues a candidate cognitive frequency band list to the UE in the current cell and the priority of each corresponding candidate cognitive frequency band.
The network side may issue the candidate cognitive frequency band list and the corresponding priority of each candidate cognitive frequency band to all user equipments in the cell through SIB messages in a cell broadcast manner, or may issue the candidate cognitive frequency band list and the corresponding priority of each candidate cognitive frequency band to each UE in a UE dedicated RRC signaling manner.
Based on the periodic or aperiodic detection result, if the candidate cognitive frequency band list and the corresponding priority of each candidate cognitive frequency band are found to be changed, the network side can periodically or aperiodically re-issue the candidate cognitive frequency band list and the corresponding priority of each candidate cognitive frequency band.
In addition, the network side may issue the key cell configuration information, such as carrier bandwidth and cell Identification (ID), corresponding to each candidate frequency band to the user equipment while issuing the candidate cognitive frequency band list and the corresponding priority of each candidate cognitive frequency band. That is, it is not necessary to notify all the cell configuration information, but only some key cell configuration information is notified.
The key cell configuration information may further include other key cell-level configuration information, such as radio Resource configuration Common defined in 3GPP TS36.331, and/or UE-level configuration information, such as rach-configuration modified defined in 3GPP TS 36.331.
Wherein, the UE level configuration information needs to be issued to the user equipment through a RRC signaling special for the UE; other information can be sent to the user equipment through SIB message, and also can be sent to the user equipment through RRC signaling dedicated for the UE.
And the user equipment receives the candidate cognitive frequency band list and the corresponding priority information. And meanwhile, receiving cell key information corresponding to each candidate frequency band sent by a network side.
Step four: when the network side detects the occurrence of a master user signal on the currently used cognitive frequency band, the network side immediately stops signal transmission on the currently used cognitive frequency band, selects the cognitive frequency band with the highest priority in the candidate cognitive frequency band list, and establishes a cell on the cognitive frequency band.
At this time, as the current cell signal disappears, the user equipment determines that the wireless link fails, thereby determining that the main user signal appears on the currently used cognitive frequency band.
Step five: after the user equipment judges that the wireless link fails, the cell selection process is carried out, in the process, candidate cognitive frequency bands are selected from a pre-stored candidate cognitive frequency band list according to the sequence of the priority from high to low, cell search is carried out on the frequency bands, and once a cell meeting the quality requirement is searched, the cell is selected to reside.
Step six: the method for establishing the connection of the user equipment in the selected cell specifically comprises the following two methods:
the method comprises the following steps: the user equipment performs an RRC connection re-establishment procedure in the selected cell (prior art).
The second method comprises the following steps: the user equipment directly performs uplink synchronization in the selected cell, and then the network side directly performs data scheduling on the UE. Of course, this method is performed on the premise that the UE has previously obtained the configuration information of the cell in step three.
A specific embodiment is given below to illustrate that the scheme provided by the embodiment of the present invention can well implement fast handover of a cell.
In the working process of the cognitive frequency band (f1), the base station periodically issues candidate frequency band list information (including frequency bands and priorities thereof) and corresponding system configuration information (namely cell configuration information) required by establishing cells in each frequency band. For example, the candidate bins and the priority order are { f2, f3, f 4.
And when a master user signal appears on the frequency band f1, the base station detects the master user signal and rapidly transfers the working frequency band to the candidate frequency band f2 with the highest priority, wherein the corresponding cell configuration information parameters are executed according to the information issued in advance.
Due to the fact that the cognitive base station signal on the f1 frequency band disappears, the user equipment working on the f1 frequency band can generate radio link failure after 200 milliseconds (ms), and an RRC connection reestablishment process is triggered.
The UE performs cell search on the candidate cognitive frequency band f2 with the highest priority, and completes the cell search of the frequency band after 100ms (if the UE performs cell measurement on the frequency band within the previous 5 s) or 800ms (if the UE does not perform cell measurement on the frequency band within the previous 5 s).
Since the UE already knows the cell configuration information in the f2 frequency band in advance, it is not necessary to receive the broadcast message in the cell. The total maximum service interruption time is therefore 400ms or 1100ms (specifically how much time, depending on whether the UE performs a cell measurement on the f2 band for a period of time)
Referring to fig. 3, a communication system provided in an embodiment of the present invention includes:
the network device 101 is configured to notify a candidate frequency band list information to the user equipment 101 in a cell established on a current cognitive frequency band, where the candidate frequency band list information includes a group of candidate frequency bands and a priority corresponding to each candidate frequency band; and when detecting that a master user accesses the current cognitive frequency band, stopping signal transmission on the current cognitive frequency band, selecting a candidate frequency band according to the priority and reestablishing the cell.
The user equipment 102 is configured to acquire candidate frequency band list information sent by the network equipment 101; and when determining that a master user accesses the current cognitive frequency band, selecting a candidate frequency band according to the priority, and residing in a cell corresponding to the selected candidate frequency band.
Preferably, referring to fig. 4, a network device 101 according to an embodiment of the present invention includes:
a candidate frequency band list information notifying unit 201, configured to notify the candidate frequency band list information to the user equipment 102 in the cell established on the current cognitive frequency band.
And the cell frequency switching unit 202 is configured to, when it is detected that a master user accesses the current cognitive frequency band, stop signal transmission in the current cognitive frequency band, select a candidate frequency band according to the priority, and reestablish a cell.
Preferably, when the candidate frequency band list information changes, the candidate frequency band list information notifying unit 201 notifies the changed candidate frequency band list information to the user equipment 102 in the cell established on the current cognitive frequency band.
Preferably, the network device 101 further includes:
a cell configuration information notifying unit 203, configured to notify the user equipment 102 in the cell established on the current cognitive frequency band of the cell configuration information corresponding to the candidate frequency band.
Preferably, the candidate band list information notifying unit 201 notifies the candidate band list information to the ue 102 in the cell established on the current cognitive band through an SIB message or a radio link control RRC signaling dedicated for the ue.
Preferably, referring to fig. 5, a user equipment 102 provided in an embodiment of the present invention includes:
a candidate frequency band list information obtaining unit 301, configured to obtain candidate frequency band list information sent by the network device 101.
A cell frequency switching unit 302, configured to select a candidate frequency band according to the priority when it is determined that a radio link failure occurs in a cell established on a cognitive frequency band in which the user equipment 102 currently operates, and implement that the user equipment 102 resides in a cell corresponding to the selected candidate frequency band.
Preferably, the candidate frequency band list information obtaining unit 301 obtains the changed candidate frequency band list information sent by the network device 101 when the candidate frequency band list information changes.
Preferably, the user equipment 102 further comprises:
a cell configuration information obtaining unit 303, configured to obtain cell configuration information corresponding to each candidate frequency band sent by the network device 101.
Preferably, the cell frequency switching unit 302 executes a radio link control RRC connection reestablishment procedure in the cell corresponding to the selected candidate frequency band; or establishing uplink synchronization in the cell corresponding to the selected candidate frequency band according to the cell configuration information corresponding to the selected candidate frequency band.
Preferably, the network device 101 according to the embodiment of the present invention may be a base station.
In summary, the technical solution provided by the embodiment of the present invention enables the LTE system to completely work in the cognitive frequency band when there is no authorized frequency band, and ensures fast deferral for the primary user and service interruption time of the user equipment to meet system requirements. Moreover, the technical scheme provided by the embodiment of the invention avoids the problem that the downlink signaling cannot be successfully issued under the condition of strong interference, can be used as a backspacing mode for triggering the cell frequency switching scheme by the base station, and under the condition that the interference intensity of the main user is high, the UE cannot receive the signaling sent by the base station, and can still use the technical scheme provided by the embodiment of the invention to complete the cell frequency switching. The technical scheme provided by the embodiment of the invention can also be suitable for other mobile communication systems and user equipment which work by using the cognitive frequency band, such as a Wimax system and the like.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (23)
1. A method for cell frequency handover, the method comprising:
the network side informs the user equipment in a cell established on the current cognitive frequency band of candidate frequency band list information, wherein the candidate frequency band list information comprises a group of candidate frequency bands and the corresponding priority of each candidate frequency band;
and when detecting that a master user accesses the current cognitive frequency band, the network side stops signal transmission on the current cognitive frequency band, selects a candidate frequency band according to the priority and reestablishes the cell.
2. The method of claim 1, wherein the candidate bands are cognitive bands.
3. The method according to claim 2, wherein the step of determining the candidate band list information by the network side comprises:
and the network side detects the interference level of the cognitive frequency bands except the current cognitive frequency band in real time, selects a group of candidate cognitive frequency bands according to a preset principle and determines the priority corresponding to each candidate cognitive frequency band according to the detection result, and generates candidate frequency band list information.
4. The method of claim 1, further comprising:
and when the candidate frequency band list information changes, the network side informs the changed candidate frequency band list information to user equipment in a cell established on the current cognitive frequency band.
5. The method of claim 1, further comprising:
and the network side informs the cell configuration information corresponding to the candidate frequency band to the user equipment in the cell established on the current cognitive frequency band.
6. The method according to any of claims 1 to 5, wherein the step of notifying, by the network side, the candidate band list information to the user equipment in the cell established on the current cognitive band comprises:
and the network side informs the user equipment in the cell established on the current cognitive frequency band of the candidate frequency band list information through a System Information Block (SIB) message or a radio link control (RRC) signaling special for the user equipment.
7. A method for cell frequency handover, the method comprising:
acquiring candidate frequency band list information sent by a network side by user equipment residing in a cell established on a current cognitive frequency band, wherein the candidate frequency band list information comprises a group of candidate frequency bands and a priority corresponding to each candidate frequency band;
and when determining that the cell established on the current cognitive frequency band has a radio link failure, the user equipment selects the candidate frequency band according to the priority and resides in the cell corresponding to the selected candidate frequency band.
8. The method of claim 7, wherein the candidate bands are cognitive bands.
9. The method of claim 7, further comprising:
and when the candidate frequency band list information changes, the user equipment acquires the changed candidate frequency band list information sent by the network side.
10. The method according to any one of claims 7-9, further comprising:
and the user equipment acquires cell configuration information corresponding to each candidate frequency band sent by a network side.
11. The method of claim 10, wherein the step of the ue camping in the cell corresponding to the selected candidate frequency band comprises:
the user equipment executes a radio link control (RRC) connection reestablishment process in a cell corresponding to the selected candidate frequency band; or,
and the user equipment establishes uplink synchronization in the cell corresponding to the selected candidate frequency band according to the cell configuration information corresponding to the selected candidate frequency band.
12. A network device, characterized in that the device comprises:
a candidate frequency band list information notification unit, configured to notify candidate frequency band list information to user equipment in a cell established on a current cognitive frequency band, where the candidate frequency band list information includes a group of candidate frequency bands and a priority corresponding to each candidate frequency band;
and the cell frequency switching unit is used for stopping signal transmission on the current cognitive frequency band when detecting that a master user accesses the current cognitive frequency band, selecting a candidate frequency band according to the priority and reestablishing the cell.
13. The device according to claim 12, wherein the candidate band list information notifying unit performs interference level detection on cognitive bands other than the current cognitive band in real time, selects a group of candidate cognitive bands according to a preset rule and determines a priority corresponding to each candidate cognitive band according to a detection result, generates candidate band list information, and notifies the candidate band list information to the user equipment in the cell established on the current cognitive band.
14. The device according to claim 12, wherein the candidate band list information notifying unit notifies, when the candidate band list information changes, the changed candidate band list information to the user equipment in the cell established on the current cognitive band.
15. The apparatus of claim 12, further comprising:
and the cell configuration information notification unit is used for notifying the cell configuration information corresponding to the candidate frequency band to the user equipment in the cell established on the current cognitive frequency band.
16. The device according to any of claims 12-15, wherein the candidate band list information notifying unit notifies the user equipment in the cell established on the current cognitive band of the candidate band list information through a system information block SIB message or a radio link control RRC signaling dedicated to the user equipment.
17. A user equipment, characterized in that the equipment comprises:
a candidate frequency band list information obtaining unit, configured to obtain candidate frequency band list information sent by a network side, where the candidate frequency band list information includes a group of candidate frequency bands and a priority corresponding to each candidate frequency band;
and the cell frequency switching unit is used for selecting the candidate frequency band according to the priority when the cell established on the cognitive frequency band where the user equipment works currently is determined to have radio link failure, and realizing that the equipment resides in the cell corresponding to the selected candidate frequency band.
18. The device according to claim 17, wherein the candidate band list information obtaining unit obtains changed candidate band list information sent by a network side when the candidate band list information changes.
19. The apparatus according to claim 17 or 18, characterized in that the apparatus further comprises:
and the cell configuration information acquisition unit is used for acquiring cell configuration information corresponding to each candidate frequency band sent by the network side.
20. The apparatus according to claim 19, wherein the cell frequency switching unit performs a radio link control RRC connection re-establishment procedure in the cell corresponding to the selected candidate frequency band; or establishing uplink synchronization in the cell corresponding to the selected candidate frequency band according to the cell configuration information corresponding to the selected candidate frequency band.
21. A communication system, the system comprising:
the network equipment is used for notifying the user equipment in the cell established on the current cognitive frequency band of candidate frequency band list information, wherein the candidate frequency band list information comprises a group of candidate frequency bands and the priority corresponding to each candidate frequency band; when a master user is detected to be accessed in the current cognitive frequency band, stopping signal transmission in the current cognitive frequency band, selecting a candidate frequency band according to the priority and reestablishing a cell;
the user equipment is used for acquiring candidate frequency band list information sent by the network equipment; and when determining that a master user accesses the current cognitive frequency band, selecting a candidate frequency band according to the priority, and residing in a cell corresponding to the selected candidate frequency band.
22. The system of claim 21, wherein the network device comprises:
a candidate frequency band list information notification unit, configured to notify the candidate frequency band list information to the user equipment in the cell established on the current cognitive frequency band;
the cell frequency switching unit is used for stopping signal transmission on the current cognitive frequency band when detecting that a master user accesses the current cognitive frequency band, selecting a candidate frequency band according to the priority and reestablishing a cell;
and the cell configuration information notification unit is used for notifying the cell configuration information corresponding to the candidate frequency band to the user equipment in the cell established on the current cognitive frequency band.
23. The system according to claim 21 or 22, wherein the user equipment comprises:
a candidate frequency band list information obtaining unit, configured to obtain candidate frequency band list information sent by the network device;
a cell frequency switching unit, configured to select a candidate frequency band according to the priority when it is determined that a radio link failure occurs in a cell established on a cognitive frequency band in which the user equipment currently operates, and implement that the equipment resides in a cell corresponding to the selected candidate frequency band;
and the cell configuration information acquisition unit is used for acquiring cell configuration information corresponding to each candidate frequency band sent by the network equipment.
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| CN2010105172294A CN102457922A (en) | 2010-10-15 | 2010-10-15 | Method, system and device for switching frequency of cell |
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| CN2010105172294A CN102457922A (en) | 2010-10-15 | 2010-10-15 | Method, system and device for switching frequency of cell |
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Application publication date: 20120516 |