CN103428708A - Wireless access method and system in cognitive wireless network - Google Patents
Wireless access method and system in cognitive wireless network Download PDFInfo
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Abstract
The invention relates to a wireless access method and system in a cognitive wireless network. Wireless access of a cognitive user terminal is assisted by utilizing a cognitive pilot channel in the cognitive wireless network. The wireless access method comprises an access method which is to access the cognitive user terminal to an idle frequency point of an authoring system, and a spectrum switching method which is triggered when a main user occurs or the service quality of a cognitive user drops to a certain threshold value. According to the invention, the communication process of the cognitive user is mainly considered, and the communication process includes an initial access process after the cognitive terminal is started up, a network environment information obtaining way, conceding and switching when the main user occurs, spectrum switching caused by reduction of communication quality, and the like; in the communication process, the cognitive pilot channel is utilized to obtain the spectrum information of the environment and help the terminal to find the network and access to the spectrum rapidly, so that operations of the cognitive terminal for scanning and sensing a large-scale spectrum are avoided, and the process of accessing the cognitive terminal to the network rapidly is realized.
Description
Technical field
The present invention relates to wireless network, particularly radio switch-in method and the system in a kind of cognition wireless network, relating in particular in a kind of cognition wireless network and utilizing cognitive pilot channel is the method and system of the auxiliary wireless access of cognitive pilot channel.
Background technology
In recent years, cognition wireless network has obtained the concern of all circles.Cognition wireless network is comprised of authoring system and unauthorized system, wherein, authoring system refers to the communication system of being licensed certain section frequency spectrum by spectrum management mechanism, and the communication of authoring system is not subject to the interference of other system, under normal conditions, the utilance of the shared frequency range of authoring system is not very high, often has idle frequency range; Unauthorized system refer to operate on unlicensed spectrum or the cognitive frequency spectrum obtained on communication system, in cognitive radio system, cognitive system is intended to again utilize the frequency range of the free time in authoring system.The user of authoring system is called primary user (primary user, PU), and aim belongs to authoring system and operates in the user that it authorizes frequency range; User in unauthorized system is called cognitive user or inferior user (secondary user/cognitive user, SU/CRU), refers to by obtaining the idle frequency spectrum in unauthorized frequency range and these idle frequency spectrums being carried out to the user that frequency spectrum is used.So-called idle frequency spectrum, refer to that certain frequency band is assigned to the primary user, but the frequency spectrum do not utilized by main family in some time domain, frequency domain or spatial domain.So-called frequency spectrum is used, refer to that cognitive user is by the acquisition of information of frequency spectrum perception and surrounding environment, find the idle frequency spectrum in authoring system, to authorized user, communication does not cause under the prerequisite of interference, in the mode of using to the seized every opportunity use of formula of idle frequency spectrum, when the primary user occurs, cognitive user exits frequency spectrum in time, thereby improves the availability of frequency spectrum.In the process of access frequency spectrum, priority ratio time user's the priority that the primary user accesses frequency spectrum is high, need to can not cause interference to the primary user by various technique guarantee time user's communication, as modulation system, the inferior user who inferior user is carried out to power control, change time user carries out frequency spectrum yielding and switching etc.In cognition wireless network, CRU is used the available free frequency spectrum in the authoring system frequency range, and prerequisite is to guarantee not primary user's communication is caused to interference.And the primary user in authoring system communicated according to former mode, suppose it and do not know to have the existence of cognitive user, as long as have, need just according to existing protocol regulation access network.
Because authorized user is uncertain to the service condition of frequency spectrum, constantly change, thereby cause available free frequency spectrum set in system also in continuous variation.Cognitive user is when initial access network, very strange to network environment, and the frequency point information that used the last time of storage in terminal is probably in busy condition, therefore select to have little significance in the community based on storage information, needs to carry out the initial cell selection on very large probability.In this case, just need terminal to carry out perception to the service condition of the mandate frequency range in each authoring system, by the assessment to each available free frequency spectrum, could determine its frequency spectrums of operation of How to choose.But the process need of this frequency spectrum perception and data fusion for a long time and also power consumption large, can reduce portable terminal device service time, reduce the satisfaction that the user uses.
So this patent proposes the initial wireless access that utilizes cognitive pilot channel (Cognitive Pilot Channel, CPC) to carry out accessory terminal.Cognitive user is by obtaining cognitive pilot channel message, obtain the various necessary informations (as: business information that access network information, usable spectrum information, network can provide, network load condition information, network policy information etc.) of cognition wireless network, thereby realize initial perception, Network finding and the autonomous operations such as network receiving selection to network environment, avoid terminal directly to carry out frequency spectrum perception and data fusion, reduce complexity and the terminal power consumption of access.
Be the method and system of the auxiliary wireless access of cognitive pilot channel about utilizing cognitive pilot channel in this cognition wireless network, have following technology:
Patent documentation 1(patent No. CN201010150099.5): cognitive system initial method, device and system that perception pilot frequency channel is supported, this patent provides a kind of method that in cognitive system of cognitive pilot tone support, terminal and working frequency points establish the link.Send frequency initialization request (being initial access network) by terminal to cognitive pilot tone AP, cognitive pilot tone AP sends frequency initialization response message and comprises cognitive pilot tone private resource descriptor.According to the up access channel of cognitive pilot tone private resource indication, the perception information of terminal transmitting terminal on this up access channel, base station sends perception information by broadcast to terminal.Common factor non-NULL by the perception information of the perception information of terminal and base station carrys out the working frequency points of decision-making terminal, and establishes the link on the working frequency points of decision-making.When a plurality of users carry out initialization request, give the different cognitive pilot tone private resource of each user assignment and different up access channels.
The patent documentation 2(patent No. is CN201110075531.3): cognitive pilot frequency transmission method and radio switch-in method and system based on cognitive pilot tone, this patent provides a kind of transmission method of cognitive pilot tone and has provided the mode that a kind of cognitive pilot tone accessory terminal carries out wireless access.By cognitive pilot tone being divided into to the cognitive pilot tone of main and secondary cognitive pilot tone, consider the cognitive pilot tone of main and the fixed physical resource that is carried in wireless access type of secondary cognitive pilot tone and the mode of variable physical resource according to the coverage condition of wireless access type, cognitive pilot frequency information is sent to terminal, to realize the optimization of user network and Radio Resource.At first need the loading position of determining the cognitive pilot tone of main by scanning, according to the coverage condition of wireless access type, decide how to load cognitive pilot frequency information.By the initial access of the cognitive pilot tone accessory terminal of main, by the continuation communication of secondary cognitive pilot tone accessory terminal.
The patent documentation 3(patent No. is CN201110405827.7): the frequency spectrum switching method in a kind of cognitive radio system and equipment, this patent provides a kind of method of cognitive system frequency spectrum switching.Arrange the cognitive radio ad Hoc wireless network device identification of user's transmission spectrum switching command by base station and user, while on active user's working frequency points, finding authorized user, generate the frequency spectrum switching command, trigger the operating process that a series of frequency spectrum switchings and frequency spectrum are made a concession.
The patent documentation 4(patent No. is CN201210069827.9): the frequency spectrum switching method in a kind of cognitive radio system and equipment, this patent is considered the dedicated random access resource of the target frequency that switch at frequency spectrum by frequency spectrum switching command command terminal base station, thereby realize the random access of terminal on the target frequency, reduce handover failure rate.
Yet, in above-mentioned prior art, there is following technological deficiency:
1, the idle frequency of cognitive user and authoring system in cognitive net communicates by letter, should comprise the network initial access process as started, the network environment information obtain manner, the complete communication processs such as frequency switching that yielding when the primary user occurs and communication quality descend, in patent documentation 1 and patent documentation 2, can only consider the initial access of terminal and network, in patent documentation 3 and patent documentation 4, only considered the frequency spectrum switching of terminal and network, the communication process of complete cognitive user has not been described.
2, as described in patent documentation 1, when a plurality of users carry out initialization request, give the different cognitive pilot tone private resource of each user assignment and different up access channels, the method is difficult for guaranteeing the smooth access network of cognitive user, easily occurs competition in access procedure.
3, as described in patent documentation 3, " after described base station equipment finds that on current working frequency the user of authoring system occurs; generate the frequency spectrum switching command " only considered the frequency spectrum switching when primary user occurs, do not consider that network service quality also needs to carry out the frequency spectrum switching while descending, 3 of patent documentations relate to the method for frequency spectrum switching, and the network type of switching are not considered.
4, as described in patent documentation 4, " base station is by the dedicated random access resource on the target working frequency points of frequency spectrum switching command designated terminal required application in the frequency spectrum handoff procedure ", avoid thus the access contention between terminal, but do not relate to the complete frequency spectrum switching flow, the network type of switching is not considered yet.
Summary of the invention
In order to address the above problem, the object of the invention is to disclose radio switch-in method and system in a kind of cognition wireless network, in communication process, considering cognition user's complete communication process, comprise the initial access process after cognitive terminal is started shooting, the network environment information obtain manner, the frequency spectrum handover decisions that yielding when the primary user occurs and switching and communication quality decline cause etc., and utilize cognitive pilot channel to obtain the spectrum information of environment, the method of the quick discovering network of accessory terminal and frequency spectrum access, thereby avoid cognitive terminal to the scanning of frequency spectrum and the operation of perception on a large scale, accelerate the process of the fast access into network of cognitive terminal.
To achieve these goals, the present invention proposes the radio switch-in method in a kind of cognition wireless network, for utilize the idle frequency of cognitive pilot channel accessory terminal insertion authority system in the cognitive user of cognition wireless network, described wireless method also comprises: the frequency spectrum switch step occurs or the service quality of cognitive user is switched to other idle frequencies from current frequency while dropping to certain threshold value for the primary user.
Radio switch-in method in cognition wireless network of the present invention comprises following access step:
1, cognitive user is synchronizeed with described cognitive pilot channel, and uses self-contained technology to position;
2, cognitive user, on the up channel of described cognitive pilot channel, sends cognitive pilot tone request message to cognitive base station, and carries oneself positional information and user identification code;
3, cognitive base stands on the down channel of described cognitive pilot channel, sends the cognitive pilot tone access assistance messages of corresponding mesh to terminal;
4, the wireless access type preferred list that cognitive user is carried according to terminal the available free frequency in described access assistance messages is assessed, and completes public land mobile network selection, community selection operation;
5, after cognitive user resides in certain community, hold period judges whether to carry out the cell reselection operation, guarantees to reside in the best community of service quality;
6, on resident frequency, to cognitive base station initiating random access procedure, accidental access response is sent to cognitive user in cognitive base station to cognitive user, thereby cognitive user and cognitive base station are established the link;
7, cognitive base station is that cognitive user is distributed ascending resource;
8, cognitive base station is cognitive user allocation of downlink resource.
Radio switch-in method in cognition wireless network of the present invention also comprises following frequency spectrum switch step:
9, primary user's active situation and cognitive user communication quality are detected in cognitive base station, and whether judgement needs the frequency spectrum switching;
10, cognitive base station triggers frequency spectrum switching, inform that cognitive user stops business, and cognitive user is waited for handover decisions;
The wireless access type select target switching frequency of the terminal that 11, carry according to cognitive user cognitive base station;
12, terminal is informed by the target of selection switching frequency in cognitive base station, and terminal re-establishes and the linking of base station according to target switching frequency point information.
13, cognitive base station is that cognitive user is distributed ascending resource and downlink resource, has continued the front uncompleted transformation task of switching.
Radio switch-in method in cognition wireless network of the present invention, described terminal configuration has the list of wireless access type preference priority.
Radio switch-in method in cognition wireless network of the present invention, be divided into the channel of two special uses as cognitive pilot tone up channel and cognitive pilot tone down channel using described cognitive pilot channel.
Radio switch-in method in cognition wireless network of the present invention, cooperated to the frequency spectrum perception process of authoring system in the wireless cognition net by cognitive user terminal and cognitive base station, determined the available free frequency of cognitive terminal by cognitive base station according to sensing results.
Radio switch-in method in cognition wireless network of the present invention, carry the available free spectrum information in described cognitive pilot tone message, and cognitive pilot tone message is divided into to two kinds of cognitive pilot tone access assistance messages and cognitive pilot tone switching assistance messages; Described cognitive pilot tone access assistance messages and described cognitive pilot tone switching assistance messages are synchronously upgraded, and these two set boundary clearly not, flexibility and changeability, but the set of described cognitive pilot tone switching assistance messages can not be sky.
Radio switch-in method in cognition wireless network of the present invention, in step 3, cognitive base station is organized spectrum information by the form of cognitive pilot tone response message, the form of described cognitive pilot tone response message is different " mesh#ID:Operator#i, RAT#j, frequency#k ... " combination, its intermediate-frequeney point can be only to enumerate available idle frequency, it can be also the state that each frequency is used by the primary user, can also comprise other information on each frequency in described cognitive pilot tone response message, and described cognitive pilot tone response message constantly upgrades according to up-to-date frequency spectrum perception fusion results.
Radio switch-in method in cognition wireless network of the present invention, in step 4, if the community selection is unsuccessful under this wireless access type, according to the wireless access type priority list, select next wireless access type, attempted at the available free frequency of next wireless access type.
Radio switch-in method in cognition wireless network of the present invention in step 4, if selection is not the wireless access type of limit priority, will first be reshuffled so before carrying out Cell searching.On cognitive pilot channel, resource is reshuffled in application, downloads corresponding agreement and carries out terminal and reshuffle.
Radio switch-in method in cognition wireless network of the present invention, in the random access procedure of step 6, cognitive base station is to random access check code of each cognitive user agreement, and all users are arranged to the content of identical accidental access response, only have by described random access check code and decode and obtain correct accidental access response, the user sets up just success with linking of base station.
Radio switch-in method in cognition wireless network of the present invention, in the random access procedure of step 6, carry out the situation of random access for a plurality of users simultaneously, only have that cognitive user of request the earliest can obtain successfully decoded, other cognitive user that do not obtain being correctly decoded are random access failure.
Radio switch-in method in cognition wireless network of the present invention, in step 11, if the available free frequency spectrum set under the current wireless access style is empty, according to current terminal traffic transport-type, select the available free frequency spectrum in other wireless access type.
Radio switch-in method in cognition wireless network of the present invention, in step 12, if cognitive user accesses or is switched to while configuring on different wireless access type with terminal is existing, need first to terminal, be reshuffled.
Technique effect of the present invention:
The present patent application can better merge with existing wireless access system, furtherly, this scheme is applied to the existing wireless communications technology, method by the auxiliary wireless access of cognitive pilot channel, by cognitive pilot channel message is obtained to spectrum environment information, avoid cognitive terminal directly to carry out frequency spectrum perception and data fusion, reduce complexity and the terminal power consumption of access.In addition, adopt cognitive terminal to reshuffle scheme, support multiple access technology, effectively utilize the existing network facility, improve the availability of frequency spectrum.
The accompanying drawing explanation
Idle frequency access process figure in the authoring system that Fig. 1 is cognitive user of the present invention and cognition network.
The frequency spectrum switching flow of the idle frequency in the authoring system that Fig. 2 is cognitive user of the present invention and cognition network.
Embodiment
In the present invention, mainly the communication process of cognitive user is considered, comprise yielding and the frequency spectrum switching that switching and communication quality descend and cause when initial access process, network environment information obtain manner, primary user after cognitive terminal start occurs, guarantee the continuity of inferior telex network as far as possible.
Below the radio switch-in method in the cognition wireless network the present invention relates to is described in detail:
Suppose that cognitive user all can be reshuffled, and could use the frequency spectrum of this wireless access type system after need to being reshuffled according to selected wireless access type.In addition, require the self-contained GPS of terminal, support cognitive pilot tone and can understand cognitive pilot tone message.Each terminal can the list of self-contained wireless access type preference priority, and is configured according to the wireless access type of limit priority.
From the characteristics of perception time consumption and energy consumption, consider that the frequency spectrum perception process is completed by cognitive terminal and cognitive base station collaboration, by cognitive base station, sensing results is merged, and the spectrum information that fusion is obtained is organized by the form of cognitive pilot tone message.The form of cognitive pilot tone response message is different { mesh#ID: the operator#i of operator, wireless access type RAT#j, frequency frequency#k ... combination, its intermediate-frequeney point can be only to enumerate available idle frequency, it can be also the state that each frequency is used by the primary user, in addition, in cognitive pilot tone response message, can also comprise other information on each frequency, as available bandwidth, loading condition, power water equality.Cognitive pilot tone message is constantly to upgrade according to up-to-date frequency spectrum perception fusion results.
Cognitive pilot channel is divided into up dedicated request channel and descending cognitive pilot tone transmission of messages channel.Cognitive system coordinates a public frequency and specific bandwidth designs as cognitive pilot channel, divides the channel of two special uses as cognitive pilot tone up channel and cognitive pilot tone down channel.
Consideration is divided into two parts by the available free frequency spectrum in cognitive pilot tone message, cognitive pilot tone access assistance messages, cognitive pilot tone switching assistance messages.(be equivalent in the set of available free frequency spectrum, reserved a part of usable spectrum is done switching.) cognitive pilot tone accesses assistance messages and cognitive pilot tone switching assistance messages is synchronously upgraded, and these two set do not have clearly boundary, flexibility and changeability, but the set of cognitive pilot tone switching assistance messages can not be sky, in order to guarantee that the cognitive user of communicating by letter has standby yielding frequency spectrum, reduces communication interruption rate.
In communication process, the primary user to the use of frequency spectrum (access, switching), inferior user's switching and inferior user's the triangular priority level of initial access is: the use (access, switching) of primary user to frequency spectrum > inferior user's switching > inferior user's initial access.
Suppose that certain cognition wireless network comprises a plurality of wireless access type technology: wireless access type 1, wireless access type 2, wireless access type 3, wireless access type 4 ... (as GSM, LTE, WIFI, WIMAX...).
Below, the cut-in method of the idle frequency in the cognitive user of the radio switch-in method in the cognition wireless network that invention is related to and the authoring system of cognition network describes, and its access process figure is as shown in Figure 1.
Step 1: cognitive user is synchronizeed with cognitive pilot channel, and uses self-contained technology (as GPS, but being not limited to GPS) to position, and is expressed as (longitude, latitude).
Step 2: cognitive user sends cognitive pilot tone message request on cognitive pilot channel up channel to cognitive base station, and positional information and the user identification code of carrying oneself (can be the user ID of registering, or the random request code generated of user etc.), format sample is as shown in table 1, but is not limited to following form.
The cognitive pilot tone request message format of table 1
Step 3: cognitive base stands in the cognitive pilot tone access assistance messages that sends corresponding mesh on cognitive pilot channel down channel to terminal, cognitive user monitors and receives the response of base station on cognitive pilot tone down channel, and cognitive pilot tone response message format example is as shown in table 2.
The cognitive pilot tone response message format of table 2
Step 4: cognitive user starts under same wireless access type, to select at random several available free frequencies to be assessed in the list of cognitive pilot tone access assistance messages according to self-contained wireless access type preference priority list.Near search cell these available frequencies, measure signal intensity, attempt carrying out PLMN selection, wireless access type selection, community selection with resident.If the community selection is unsuccessful under this wireless access type, according to the wireless access type priority list, select next wireless access type, at the available free frequency of next wireless access type, attempted.If what select is not the wireless access type of limit priority, before carrying out Cell searching, to first be reshuffled so.On cognitive pilot channel, resource is reshuffled in application, downloads corresponding agreement and carries out terminal and reshuffle.Reshuffled and can effectively be utilized existing base station facility in terminal, do not needed the base station facility that any wide-area deployment is new, and, utilize existing protocol to communicate, can reduce implementation complexity.
Step 5: after cognitive user resides in certain community, hold period ground to be measured cell signal strength, judge whether to carry out cell reselection, guarantee to reside in all the time the best community of service quality.
Step 6: subsequently, cognitive user to cognitive base station initiating random access procedure, establishes the link with cognitive base station on resident frequency.Cognitive base station is to random access check code of each cognitive user agreement, and all users are arranged to the content of identical accidental access response, only have by random access check code and decode and obtain correct accidental access response, the user sets up just success with linking of base station.Carry out the situation of random access for a plurality of users simultaneously, only have that cognitive user of request the earliest can obtain successfully decoded.Other cognitive user that do not obtain being correctly decoded are random access failure, trigger under the frequency catalogue of other users same wireless access type in up-to-date cognitive pilot tone access message again random select from before different frequency again access at random.The user of random access failure stipulates according to existing protocol, initiating random access procedure again after waiting for a period of time.
Step 7: after cognitive user accesses successfully at random, access at random successful message to cognitive base station feedback.After the message that random access is successful is received in cognitive base station, just trigger it cognitive user is distributed to corresponding ascending resource, select frequency resource and upgrade the available free frequency point sets in cognitive pilot tone access message, the ascending resource allocation result being informed to cognitive user simultaneously.
Step 8: when having downlink data to arrive, cognitive base station is to cognitive user allocation of downlink resource, and informs cognitive user.
As described above, cognitive user just can access the idle frequency in the authoring system of cognition network smoothly.
But, due to the time variation of spectrum environment, after cognitive user access cognition network, likely have the situation that the primary user occurs or the frequency service quality that accesses descends, at this moment, need to carry out the frequency spectrum switching.
Below, the frequency spectrum switching method of the idle frequency in the cognitive user of the radio switch-in method in the cognition wireless network that invention is related to and the authoring system of cognition network describes, and its frequency spectrum switching flow figure is as shown in Figure 2.
Step 9: after cognitive user access cognition network, by the cognitive base standing-meeting, according to the frequency spectrum perception result merged, judge on the frequency that cognitive user used whether have the primary user to occur, simultaneously to monitor the service quality that cognitive user is communicated by letter.Once monitor, the primary user occurs or the service quality of cognitive user drops to certain threshold value, just triggers the frequency spectrum handoff procedure.
Step 10: cognitive user preparation switching is informed in cognitive base station, stops the business transmission.Cognitive user is waited for cognitive base station handover decisions.
Step 11: cognitive base station is searched in the list of cognitive pilot tone switching assistance messages according to the wireless access type of the current use of cognitive terminal, selects a suitable target switching frequency.If the available free frequency spectrum set under the current wireless access style is empty, according to current terminal traffic transport-type, select the available free frequency spectrum in other wireless access type.
Step 12: terminal is informed by the handover decisions result in cognitive base station.If the wireless access type type is constant, cognitive base stands on the target frequency and accesses at random, with cognitive base, stands on target switching frequency and establishes the link.If wireless access type changes, base station notice cognitive user first on cognitive pilot channel application reshuffle resource, download corresponding agreement and carry out terminal and reshuffle.After reshuffling end, then start to search for the target frequency, access at random, re-establish and the linking of base station.
Step 13: after frequency spectrum has switched, cognitive base station is that cognitive user is distributed new up and downlink resource, and informs the user, has continued the front uncompleted business of switching.
Step 14: after linking foundation in cognitive base station with cognitive user, according to the frequency spectrum handoff procedure of the idle frequency in the authoring system of this cognitive user and cognition network, repeated execution of steps 9-step 13.
The above method is all the primary user not to be caused under the prerequisite of interference, cognitive user is waited for an opportunity to use access control that the available free frequency spectrum of authoring system communicates and the primary user frequency spectrum while occurring and is made a concession the implementation procedure with switching, can effectively improve the availability of frequency spectrum.Simultaneously, reserved by part available free frequency spectrum, guarantee reliability and the continuity of time telex network.By the auxiliary frequency spectrum perception of cognitive pilot tone message and frequency spectrum access, power consumption and wide-band scanning and assessment consuming time while effectively having avoided cognitive user to advance to select network insertion.
Claims (14)
1. the radio switch-in method in a cognition wireless network, for utilize the idle frequency of cognitive pilot channel accessory terminal insertion authority system in the cognitive user of cognition wireless network, it is characterized in that, described wireless method also comprises: the frequency spectrum switch step occurs or the service quality of cognitive user is switched to other idle frequencies from current frequency while dropping to certain threshold value for the primary user.
2. the radio switch-in method in cognition wireless network as claimed in claim 1, is characterized in that, the idle frequency of described insertion authority system specifically comprises the following steps:
Step 1, cognitive user are synchronizeed with described cognitive pilot channel, and are used self-contained technology to position;
Step 2, cognitive user, on the up channel of described cognitive pilot channel, send cognitive pilot tone request message to cognitive base station, and carry oneself positional information and user identification code;
Step 3, cognitive base stand on the down channel of described cognitive pilot channel, send the cognitive pilot tone access assistance messages of corresponding mesh to terminal;
The wireless access type preferred list that step 4, cognitive user are carried according to terminal the available free frequency in described access assistance messages is assessed, and completes public land mobile network selection, community selection operation;
Behind step 5, resident certain community of cognitive user, hold period judges whether to carry out the cell reselection operation, guarantees to reside in the best community of service quality;
Step 6, cognitive user are to cognitive base station initiating random access procedure on resident frequency, and accidental access response is sent to cognitive user in cognitive base station, thereby cognitive user and cognitive base station are established the link;
Step 7, cognitive base station are that cognitive user is distributed ascending resource;
Step 8, cognitive base station are cognitive user allocation of downlink resource.
3. the radio switch-in method in cognition wireless network as claimed in claim 1, is characterized in that, described frequency spectrum switch step specifically comprises the following steps:
Primary user's active situation and cognitive user communication quality are detected in step 9, cognitive base station, and whether judgement needs the frequency spectrum switching;
Step 10, the switching of cognitive base station triggers frequency spectrum, inform that cognitive user stops business, and cognitive user is waited for handover decisions;
The wireless access type select target switching frequency of the terminal that carry according to cognitive user step 11, cognitive base station;
Step 12, cognitive base station are informed terminal by the target of selection switching frequency, and terminal re-establishes and the linking of base station on target switching frequency.
Step 13, cognitive base station are that cognitive user is distributed ascending resource and downlink resource, have continued the front uncompleted transformation task of switching.
4. as the radio switch-in method in claim 1,2 or 3 described cognition wireless networks, it is characterized in that, described terminal configuration has the list of wireless access type preference priority.
5. the radio switch-in method in cognition wireless network as claimed in claim 1 or 2, is characterized in that, described cognitive pilot channel is divided into to the channel of two special uses as cognitive pilot tone up channel and cognitive pilot tone down channel.
6. as the radio switch-in method in claim 1,2 or 3 described cognition wireless networks, it is characterized in that, the terminal of carrying by cognitive user and cognitive base station have cooperated to the frequency spectrum perception process of the idle frequency of authoring system in the wireless cognition net, are determined the working frequency points of terminal according to sensing results by cognitive base station.
7. the radio switch-in method in cognition wireless network as claimed in claim 1 or 2, it is characterized in that, there is the available free frequency spectrum in described cognitive pilot tone message, and the available free frequency spectrum in cognitive pilot tone message is divided into to cognitive pilot tone access assistance messages and cognitive pilot tone switching assistance messages; Described cognitive pilot tone access assistance messages and described cognitive pilot tone switching assistance messages are synchronously upgraded, and these two set boundary clearly not, flexibility and changeability, but the set of described cognitive pilot tone switching assistance messages can not be sky.
8. the radio switch-in method in cognition wireless network as claimed in claim 1 or 2, it is characterized in that, in step 3, cognitive base station is organized spectrum information by the form of cognitive pilot tone response message, the form of described cognitive pilot tone response message is different " mesh#ID:Operator#i, RAT#j, frequency#k ... " combination, its intermediate-frequeney point is for only enumerating available idle frequency, or the state used by the primary user for each frequency, can also comprise other information on each frequency in described cognitive pilot tone response message, and described cognitive pilot tone response message constantly upgrades according to up-to-date frequency spectrum perception fusion results.
9. the radio switch-in method in cognition wireless network as claimed in claim 1 or 2, it is characterized in that, in step 4, if community is selected unsuccessful under this wireless access type, according to the wireless access type priority list, select next wireless access type, attempted at the available free frequency of next wireless access type.
10. the radio switch-in method in cognition wireless network as claimed in claim 1 or 2, it is characterized in that, in step 4, if what select is not the wireless access type of limit priority, before carrying out Cell searching, to first be reshuffled so, on cognitive pilot channel, resource is reshuffled in application, downloads corresponding agreement and carries out terminal and reshuffle.
11. the radio switch-in method in cognition wireless network as claimed in claim 1 or 2, it is characterized in that, in the random access procedure of step 6, cognitive base station is to random access check code of each cognitive user agreement, and all users are arranged to the content of identical accidental access response, only have by described random access check code and decode and obtain correct accidental access response, the user sets up just success with linking of base station.
12. the radio switch-in method in cognition wireless network as described as claim 1 or 6, it is characterized in that, in the random access procedure of step 6, carry out the situation of random access for a plurality of users simultaneously, only have that cognitive user of request the earliest can obtain successfully decoded, other cognitive user that do not obtain being correctly decoded are random access failure.
13. the radio switch-in method in cognition wireless network as described as claim 1 or 3, it is characterized in that, in step 11, if the available free frequency spectrum set under the current wireless access style is empty, according to current terminal traffic transport-type, select the available free frequency spectrum in other wireless access type.
14. the radio switch-in method in cognition wireless network as described as claim 1 or 3, it is characterized in that, in step 12, if cognitive user accesses or is switched to while configuring on different wireless access type with terminal is existing, need first to terminal, be reshuffled.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105323765A (en) * | 2014-07-30 | 2016-02-10 | 普天信息技术有限公司 | Band resource allocation method |
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| CN106063347A (en) * | 2014-12-27 | 2016-10-26 | 华为技术有限公司 | Method and device for using unlicensed frequency spectrum |
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| CN105359604B (en) * | 2014-02-28 | 2020-02-14 | 华为技术有限公司 | Method, device and system for communication by using unlicensed spectrum |
| US10659968B2 (en) | 2014-02-28 | 2020-05-19 | Huawei Technologies Co., Ltd. | Method for performing communication by using unlicensed spectrum, device, and system |
| CN103957606A (en) * | 2014-05-23 | 2014-07-30 | 国网四川省电力公司信息通信公司 | Data transmission method based on electric power telecommunication system |
| CN106537994A (en) * | 2014-07-25 | 2017-03-22 | 中兴通讯(美国)公司 | Wireless communications energy aware power sharing radio resources method and apparatus |
| CN105323765B (en) * | 2014-07-30 | 2018-11-23 | 普天信息技术有限公司 | A kind of method for distributing frequency band sources |
| CN105323765A (en) * | 2014-07-30 | 2016-02-10 | 普天信息技术有限公司 | Band resource allocation method |
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| CN106063347B (en) * | 2014-12-27 | 2019-11-29 | 华为技术有限公司 | Use the method and apparatus of unlicensed spectrum |
| CN106304091A (en) * | 2015-05-15 | 2017-01-04 | 索尼公司 | The method and apparatus distributed for the frequency of unauthorized frequency range |
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| CN107318150A (en) * | 2017-07-28 | 2017-11-03 | 浙江大学 | A kind of user of LTE U autonomous systems is resident flow |
| CN107318150B (en) * | 2017-07-28 | 2019-09-06 | 浙江大学 | A kind of resident process of the user of LTE-U autonomous system |
| US11330666B2 (en) | 2017-10-20 | 2022-05-10 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Data transmitting method and terminal device |
| WO2019075816A1 (en) * | 2017-10-20 | 2019-04-25 | Oppo广东移动通信有限公司 | Data transmission method, terminal device, and session management function (smf) device |
| US11304260B2 (en) | 2017-10-20 | 2022-04-12 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Data transmission method, terminal device, and network device |
| CN111316705B (en) * | 2017-11-13 | 2022-03-25 | Oppo广东移动通信有限公司 | Method for selecting cell, terminal equipment and network equipment |
| CN111316705A (en) * | 2017-11-13 | 2020-06-19 | Oppo广东移动通信有限公司 | Method for selecting cell, terminal equipment and network equipment |
| US11234175B2 (en) | 2017-11-13 | 2022-01-25 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for selecting cell, terminal device, and network device |
| CN111031572B (en) * | 2018-10-09 | 2022-04-29 | 华为技术有限公司 | Data transmission method and device |
| CN111031572A (en) * | 2018-10-09 | 2020-04-17 | 华为技术有限公司 | Data transmission method and device |
| CN109729561B (en) * | 2019-02-22 | 2020-12-22 | 重庆邮电大学 | Spectrum switching method in cognitive heterogeneous radio network |
| CN109729561A (en) * | 2019-02-22 | 2019-05-07 | 重庆邮电大学 | Recognize frequency spectrum switching method in heterogeneous radio network |
| CN110492955B (en) * | 2019-08-19 | 2021-11-23 | 上海应用技术大学 | Spectrum prediction switching method based on transfer learning strategy |
| CN110492955A (en) * | 2019-08-19 | 2019-11-22 | 上海应用技术大学 | Spectrum prediction switching method based on transfer learning strategy |
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