CN102457928A - Frequency point migration triggering method, frequency point migration method, system and device - Google Patents
Frequency point migration triggering method, frequency point migration method, system and device Download PDFInfo
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Abstract
An embodiment of the invention discloses a frequency point migration triggering method, a frequency point migration method, a system and a device, relating to the wireless communication technology field. The invention is used for raising timeliness and robustness of frequency point migration in a cognitive radio (CR) wireless communication system. The above two methods comprise the following steps: determining a frequency point migration parameter employed by a terminal in carrying out frequency point migration, and sending the frequency point migration parameter to the terminal; when a present working frequency point detects a signal of an authorization system, at a preset resource position, sending a frequency point migration indication SSIS sequence which triggers the terminal to carry out frequency point migration to the terminal; receiving a frequency point migration parameter sent by a base station and saving the frequency point migration parameter; at the preset resource position, detecting an SSIS sequence sent by the base station, and when the SSIS sequence is detected, carrying out frequency point migration according to the frequency point migration parameter. By employing the methods, the system and the device in the invention, the timeliness and robustness of the frequency point migration in the CR wireless communication system can be effectively raised.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of frequency migration and trigger and frequency moving method, system and equipment.
Background technology
Along with the develop rapidly of wireless communication technology, the growing broadband wireless communications demand and the contradiction of limited frequency spectrum resource become clear day by day.On the one hand; Though can pass through multiple-input and multiple-output (multiple input multiple output; MIMO), Digital Signal Processing such as high order modulation improves the utilance of unit frequency spectrum; But can not fundamentally solve the rare problem of frequency spectrum resource, and from signal propagation characteristics, low frequency has the incomparable advantage of high frequency; On the other hand, but there is the free time in various degree in the frequency spectrum resource of much having distributed to existing wireless system on time and space, but limit the access of potential wireless communication system.This mainly since existing spectrum management and distribution policy cause, i.e. frequency spectrum resource method of salary distribution relative fixed, can't be quick self-adapted adjust according to demand.
Under this background; Cognitive radio (Cognitive Radio; CR) technology receives gradually widely and paying close attention to; Its basic thought is: on the basis that does not influence the authoring system proper communication of authorizing frequency range, the Wireless Telecom Equipment opportunistic with cognitive function is the idle frequency spectrum of insertion authority frequency range (opportunistic), and dynamically utilizes frequency spectrum.The core concept of cognitive radio is Wireless Telecom Equipment to be had find idle frequency spectrum and the ability of rationally utilizing.Cognitive radio technology can fundamentally solve at present the irrational utilization to frequency spectrum resource that the fixed allocation policy because of frequency spectrum causes.
The notion of cognitive radio is proposed in 1999 by Joseph Mitola at first, strengthens the flexibility of individual radio service through wireless knowledge description language, helps the user to select best, the most cheap service to carry out wireless transmission automatically.(Federal Communications Commission FCC) is referred to as cognitive radio to any radio with adaptive spectrum perception in FCC.After this, FCC has provided the definition of cognitive radio: cognitive radio be meant can be through with operational environment mutual, change the wireless device of transmitter parameter.
Cognitive radio technology provides cognitive user opportunistic ground to share the ability of frequency spectrum, makes cognitive system have following ability:
The frequency spectrum perception ability is promptly caught from the wireless environment of its work or perception mandate frequency spectrum uses information, thereby identifies the idle frequency spectrum of the mandate frequency range in specific time domain and spatial domain; When being operated in the mandate frequency range, detect the appearance of authoring system;
Spectrum analysis and decision-making capability are promptly estimated the characteristic of idle frequency spectrum, and select best idle frequency spectrum communication according to system requirements and spectral characteristic, and decision associated transport parameter;
The frequency spectrum share ability is promptly used idle frequency spectrum with other cognitive user cooperation ground, comprises that mainly dynamic spectrum inserts and dynamic frequency spectrum deployment, needs to consider to insert and validity, fairness and the communication overhead etc. that distribute;
Frequency spectrum mobility ability promptly when detecting the authoring system appearance or needing the channel of better quality, is moved to and is proceeded communication on another frequency, reduces the interference to authoring system, and guarantees the continuity of cognitive system business.
Based on above prior art introduction, can find out that cognitive radio technology utilizes idle frequency spectrum with can making the wireless system opportunistic, thereby improve the utilance of frequency spectrum, fundamentally solve the rare contradiction idle of frequency spectrum resource with authorizing frequency spectrum resource.For example adopt the wireless communication system and the broadcast system of CR technology to share the 700MHz frequency range, promptly utilize to CR wireless communication system opportunistic the idle frequency spectrum communication of broadcast band, improve the utilance of broadcast band on the one hand; On the other hand because the good propagation characteristic of 700MHz can promote the efficient and the covering of CR wireless communication system.
In order to guarantee not influence the operate as normal of broadcast system, just need the design technology compatible with existing broadcast system, adopt the CR wireless communication system of frequency spectrum perception and frequency migrating technology can realize above-mentioned functions.The starting point of frequency migration is to be deployed in the CR wireless communication system of authorizing frequency range; When detecting the authoring system signal and occur; Discharge current frequency apace; Select new idle frequency to set up the sub-district, and notify the user to carry out the fast frequency point migration, to reduce interference and the professional continuity of assurance CR wireless communication system authoring system.
Yet when the authoring system signal occurred, the CR wireless communication system need in time notify its terminal to carry out the frequency migration on the one hand, to reduce the interference of authoring system and the service continuity of assurance CR wireless communication system; On the other hand, the CR wireless communication system has been under the strong jamming of authoring system, needs to adopt the method for robustness to notify its terminal to carry out the frequency migration.Therefore adopt in time and the method for strong robustness notice terminal is carried out the frequency migration and had great significance for the CR wireless communication system.
The migration of existing frequency generally realizes through the hand off signaling of complicacy alternately, wherein the base station of CR wireless communication system and terminal (UE) aloft the Signalling exchange of interface comprise:
The base station of step 1:CR wireless communication system in the source frequency UE is measured control;
Frequency scheduling UE carries out reporting measuring result in the source in the base station of step 2:CR wireless communication system, judges the target frequency of UE migration according to measurement result;
The base station of step 3:CR wireless communication system is frequency scheduling UE in the source; Send Radio Resource control (RRC) to UE and connect reallocation message (RRC Connection Reconfiguration), wherein comprise mobility control information (Mobility Control Information);
Step 4:UE carries out synchronously at the target frequency, sends lead code (preamble);
The base station of step 5:CR wireless communication system is adjusted UE at the target frequency synchronously, accomplishes synchronously;
Step 6:UE sends RRC through the target frequency and connects reprovision completion message (RRC connection Reconfiguration complete).
Wherein, comprise following content in the Mobility Control Information information: Target Cell Identifier (ID), carrier frequency point, the exclusive configuration of bandwidth and sub-district and insert relevant configuration information etc. at random.
In realizing process of the present invention, the inventor finds to exist in the prior art following technical problem:
In the prior art, the CR wireless communication system need be when detecting the authoring system signal and occur, and the rapid release current working frequency is set up the sub-district fast on other idle frequency, and notify its terminal to carry out the fast frequency point migration.Therefore two indexs of the general design of CR system are respectively applied for protection authoring system and the continuity that guarantees that the CR wireless communication system is professional: the time index that the CR wireless communication system discharges current working frequency is the service outage duration index of release time index, CR wireless communication system.
When the authoring system signal occurred, the CR wireless communication system needed timely its notice terminal to carry out the frequency migration on the one hand; On the other hand, the CR wireless communication system has been under the strong jamming of authoring system, needs to adopt the method for strong robustness to notify its terminal to carry out the frequency migration.Therefore adopt in time and the method for robustness notice terminal is carried out the frequency migration and had great significance for the CR wireless communication system.
Yet; Existing frequency migration generally realizes through the sub-district hand off signaling of complicacy alternately; And comprise in the signaling like Target cell ID; The exclusive configuration in carrier frequency point, bandwidth and sub-district and insert bulk information such as relevant configuration at random can't be satisfied the promptness and the robustness of CR frequency points of wireless communication system migration, causes the CR wireless communication system can't satisfy the requirement of frequency migration performance index.
Summary of the invention
The embodiment of the invention provides frequency migration trigger equipment and a kind of base station in the frequency migration triggering method in a kind of CR wireless communication system, a kind of CR wireless communication system, is used for improving promptness and the robustness that the frequency migration is carried out at CR wireless communication system notice terminal.
Frequency migration triggering method in a kind of CR wireless communication system, this method comprises:
Confirm that the terminal carries out the frequency transfer parameter that frequency migration is adopted, and send this frequency transfer parameter to the terminal;
When current working frequency detects the signal of authoring system, send the SSIS sequence that the frequency migration is carried out at this terminal of triggering to the terminal at predefined resource location.
Frequency migration trigger equipment in a kind of CR wireless communication system, this device comprises:
Information transmitting unit is used for definite terminal and carries out the frequency transfer parameter that the frequency migration is adopted, and sends this frequency transfer parameter to the terminal;
Frequency migration trigger element is used for when current working frequency detects the signal of authoring system, sends to the terminal at predefined resource location and triggers the SSIS sequence that the frequency migration is carried out at this terminal.
A kind of base station, this base station comprise the frequency migration trigger equipment in the above-mentioned CR wireless communication system.
In this programme; In advance the frequency transfer parameter that frequency migration adopted is carried out at the terminal and send to the terminal; And when current working frequency detects the signal of authoring system; Send to trigger the SSIS sequence that the frequency migration is carried out at this terminal to the terminal, and carry out the frequency migration through the hand off signaling notice terminal, sub-district of complicacy in the prior art and compare, the present invention effectively raises the promptness that the frequency migration is carried out at the notice terminal in the CR wireless communication system.And the frequency migration that this programme adopts the SSIS sequence to carry out the frequency migration as triggering terminal is indicated, and can improve the probability that the CR terminal of wireless communication system successfully detects frequency migration indication, and then has effectively improved the robustness of notice terminal frequency migration.
The embodiment of the invention provides frequency moving method, the frequency moving apparatus in a kind of CR wireless communication system, a kind of terminal and a kind of CR wireless communication system in a kind of CR wireless communication system, is used for improving promptness and the robustness that the CR wireless communication system carries out the frequency migration.
Frequency moving method in a kind of CR wireless communication system, this method comprises:
Receive the frequency transfer parameter that send the base station, preserve this frequency transfer parameter;
In the SSIS sequence of predefined resource location base stations detected transmission, and when detecting this SSIS sequence, carry out the frequency migration according to said frequency transfer parameter.
Frequency moving apparatus in a kind of CR wireless communication system, this device comprises:
Frequency transfer parameter receiving element is used to receive the frequency transfer parameter of sending the base station, preserves this frequency transfer parameter;
The frequency migration units is used for the SSIS sequence in predefined resource location base stations detected transmission, and when detecting this SSIS sequence, carries out the frequency migration according to said frequency transfer parameter.
A kind of CR wireless communication system, this system comprises:
The base station is used for definite terminal and carries out the frequency transfer parameter that the frequency migration is adopted, and sends this frequency transfer parameter to the terminal; When current working frequency detects the signal of authoring system, send the SSIS sequence that the frequency migration is carried out at this terminal of triggering to the terminal at predefined resource location.
The terminal is used to receive the frequency transfer parameter of sending the base station, preserves this frequency transfer parameter; In the SSIS sequence of predefined resource location base stations detected transmission, and when detecting this SSIS sequence, carry out the frequency migration according to said frequency transfer parameter.
A kind of terminal, this terminal comprise the frequency moving apparatus in the above-mentioned CR wireless communication system.
In this programme, receive the frequency transfer parameter that send the base station, preserve this frequency transfer parameter; In the SSIS sequence of predefined resource location base stations detected transmission, and when detecting this SSIS sequence, carry out the frequency migration according to said frequency transfer parameter.With realize alternately that through the sub-district hand off signaling of complicacy frequency migration compares in the prior art, the present invention effectively raises the promptness that the CR wireless communication system carries out the frequency migration.And the frequency migration that this programme adopts the SSIS sequence to carry out the frequency migration as triggering terminal is indicated, and can improve the probability that the CR terminal of wireless communication system successfully detects frequency migration indication, and then has effectively improved the robustness of terminal frequency migration.
Description of drawings
The method flow sketch map that Fig. 1 provides for the embodiment of the invention;
Another method schematic flow sheet that Fig. 2 provides for the embodiment of the invention;
Fig. 3 A is the method flow sketch map of the embodiment of the invention one;
Fig. 3 B is the method flow sketch map of the embodiment of the invention two;
Fig. 3 C is the method flow sketch map of the embodiment of the invention three;
The system configuration sketch map that Fig. 4 provides for the embodiment of the invention;
The architecture of base station sketch map that Fig. 5 provides for the embodiment of the invention;
The terminal structure sketch map that Fig. 6 provides for the embodiment of the invention.
Embodiment
Carry out the promptness of frequency migration in order to improve the CR terminal of wireless communication system; The embodiment of the invention provides the triggering method of the frequency migration in a kind of CR wireless communication system; In this method; The base station of CR wireless communication system is carried out the frequency transfer parameter that frequency migration adopted with the terminal in advance and is sent to the terminal, and when current working frequency detects the signal of authoring system, sends to the terminal and triggers frequency migration indication (the Spectrum Switch Indication Sequence that the frequency migration is carried out at this terminal; SSIS) sequence, terminal are carried out the frequency migration according to the frequency transfer parameter that receives when detecting this SSIS sequence.
Referring to Fig. 1, the frequency migration triggering method in the CR wireless communication system that the embodiment of the invention provides specifically may further comprise the steps:
Step 10: the base station confirms that the terminal carries out the frequency transfer parameter that frequency migration is adopted, and sends this frequency transfer parameter to the terminal;
Step 11: when the base station detects the signal of authoring system in current working frequency, send the SSIS sequence that the frequency migration is carried out at this terminal of triggering to the terminal at predefined resource location.Here, authoring system is meant that being authorized to except that the CR wireless communication system uses the wireless communication system of this current working frequency points.
In the step 11, said frequency transfer parameter comprises: the information of subsequent use frequency and/or frequency transit time information; The information of said subsequent use frequency is the information of the frequency that can move to of terminal; Said frequency transit time information is the temporal information that the frequency migration is carried out at the terminal.
Here, when the frequency transfer parameter comprised the information of subsequent use frequency, this subsequent use frequency was moved to current working frequency in the terminal; When the frequency transfer parameter comprised the information of subsequent use frequency and frequency transit time, this subsequent use frequency was moved to current working frequency in the terminal in this frequency transit time; When the frequency transfer parameter comprises the information of frequency transit time; The frequency migration is carried out at the terminal in this frequency transit time; Specifically moving to which frequency can confirm through automatic function of search; Be that the new working frequency points that the base station is confirmed in search is automatically passed through at the terminal, and the working frequency points of self is moved to this frequency.
Preferable, the base station is after the frequency transfer parameter is sent at the terminal in step 10, and the frequency transfer parameter that the frequency migration is adopted is carried out in base station more new terminal, and sends the frequency transfer parameter after upgrading to the terminal.Concrete; The frequency transfer parameter that the frequency migration is adopted can be carried out by periodic or acyclic more new terminal in the base station; For example; The information of the subsequent use frequency in the frequency transfer parameter can be upgraded in the base station when confirming that with analysis variation has taken place operable subsequent use frequency through frequency spectrum perception.Again for example, the frequency transit time information in the frequency transfer parameter is upgraded in the base station when confirming to need to revise frequency transit time information.
In the step 11; The base station is sent the employed resource location of SSIS sequence to the terminal and can be made an appointment with the terminal; The base station is sent the SSIS sequence in the appointed resource position to the terminal; The terminal is then in appointed resource position probing SSIS sequence, and at this moment, the base station need not sent the information of this resource location to the terminal.Same, which kind of SSIS sequence the base station sends also can be made an appointment with the terminal, and the SSIS sequence of arranging is sent to the terminal in the base station, and the SSIS sequence of agreement is then detected at the terminal, and at this moment, the base station need not sent the descriptor of this SSIS sequence to the terminal.
As another kind of mode; The base station can also be when this frequency transfer parameter be sent at the terminal; Send the information of said resource location and/or the descriptor of said SSIS sequence to the terminal, the terminal is then detected the described SSIS sequence of this descriptor according to the information of this resource location at this resource location.Here, the descriptor of SSIS sequence comprises the type, serial number information of SSIS sequence etc., and a SSIS sequence can be confirmed according to the descriptor of the SSIS sequence that receives is unique in the terminal.Here; The base station is when this frequency transfer parameter is sent at the terminal; Send the information of said resource location and/or the descriptor of said SSIS sequence to the terminal; Specifically can be the descriptor of the information of said resource location and/or said SSIS sequence and frequency transfer parameter to be carried in the same message send; Also can be that descriptor with the information of frequency transfer parameter and said resource location and/or said SSIS sequence is carried in the different messages and sends, but this different messages be sent out simultaneously.
Same, after the information of resource location was sent at the terminal, the base station can be upgraded and send the employed resource location of SSIS sequence, and sends the information of the resource location after upgrading to the terminal in the base station.After the descriptor of SSIS sequence was sent at the terminal, the base station can be upgraded triggering terminal and carries out frequency and move employed SSIS sequence, and sends the descriptor of the SSIS sequence after upgrading to the terminal in the base station.
The information of also promptly, sending the employed resource location of SSIS sequence can be static or dynamic-configuration; The descriptor of SSIS sequence also can be static or dynamic-configuration on the other hand.
In the step 11, the base station is sent the SSIS sequence at predefined resource location to the terminal, and its concrete realization can be following:
The signal interference strength of said authoring system to said CR system confirmed in the base station, confirms to send to the terminal number of times and the transmitted power of SSIS sequence according to this interference strength, according to definite result at predefined resource location to terminal transmission SSIS sequence.For example; If said authoring system is bigger to the signal interference strength of said CR system; Then the number of times to terminal transmission SSIS sequence is more, transmitted power is also big more; If said authoring system is less to the signal interference strength of said CR system, the number of times that then sends the SSIS sequence to the terminal more less, transmitted power is also more little.
Preferable, said CR wireless communication system be Long Term Evolution (Long Term Evolution, LTE) during system, said resource location be positioned at Physical Control Format Indicator Channel (Physical Control Format Indicator Channel, PCFICH).Said SSIS sequence can be 4 control format indication (Control Format Indicator, CFI) sequence for call number.
Certainly, said resource location also can be positioned at other descending transmission channel.Said SSIS sequence can be that the burst that frequency moves is carried out at other any these terminals of can triggering.
The base station also need discharge current working frequency in the step 11 when current working frequency detects the signal of authoring system, sets up new sub-district at subsequent use frequency.
Referring to Fig. 2, the embodiment of the invention also provides the frequency moving method in a kind of CR wireless communication system, specifically may further comprise the steps:
Step 20: the terminal receives the frequency transfer parameter that send the base station, preserves this frequency transfer parameter;
Step 21: the SSIS sequence that send in predefined resource location base stations detected at the terminal, and when detecting this SSIS sequence, carry out the frequency migration according to said frequency transfer parameter.
In the step 21, when said frequency transfer parameter comprised the information of subsequent use frequency, the concrete realization of carrying out the frequency migration according to the frequency transfer parameter can be following: the terminal discharged current working frequency points, and moves to said subsequent use frequency.
When said frequency transfer parameter also comprised frequency transit time information, the terminal in indicated time, was moved to said subsequent use frequency at this frequency transit time.
Preferable, when receiving the frequency transfer parameter of sending the base station at the terminal, the terminal can also receive the information of the resource location that sends the base station and/or the descriptor of SSIS sequence; Accordingly, in the step 21, the described SSIS sequence of said descriptor that send in said resource location base stations detected at the terminal.
Preferable, when said CR wireless communication system was the LTE system, said resource location was positioned at PCFICH.Said SSIS sequence is that call number is 4 CFI sequence.
Specify in the face of the present invention down:
The present invention proposes a kind of fast frequency point migration triggering method, and the wireless communication system that adopts cognitive radio technology is when authoring system occurs, and this invention capable of using in time and effectively notifies its terminal use to carry out predefined frequency migration.Basic principle is: at first when normal operation, CR radio communication system base station and terminal are arranged predefined frequency transfer parameter and are safeguarded relevant information; When secondly the CR radio communication system base station finds that authoring system occurs; Send predefined SSIS and notify its terminal use to carry out the frequency migration, and discharge current working frequency, set up new sub-district at subsequent use frequency; And the CR radio communication system terminal is when detecting the SSIS sequence of this sub-district; Trigger the frequency migratory behaviour, discharge current working frequency, move to predefined frequency according to predefined mode.
Adopt CR wireless communication system job step of the present invention following:
Step 01: normal operation stage, CR radio communication system base station and terminal agreement are also safeguarded predefined frequency transfer parameter.
This step is the preparatory stage of fast frequency point migration triggering method.In normal operation stage, the CR radio communication system base station is notified predefined frequency transfer parameter of its terminal use and content through methods such as broadcast, RRC signalings, like information such as subsequent use frequency point information, the skews of frequency transit time.The CR wireless communication system can be according to the dynamic change of subsequent use frequency, and periodicity or aperiodicity maintenance are also upgraded predefined frequency transfer parameter.
Step 02: when authoring system occurred, the CR wireless communication system adopted triggering method to move to subsequent use frequency operation according to predefined mode.
This step is the execution phase of fast frequency point migration triggering method.When authoring system occurred, the CR radio communication system base station sent predefined SSIS sequence and notifies its terminal use to carry out the frequency migration, and discharges current working frequency, sets up new sub-district at subsequent use frequency.
CR radio communication system terminal user adopts sequence detecting method to detect the SSIS sequence of sub-district, place.When detecting the SSIS sequence, CR radio communication system terminal user triggers frequency migration, discharges current working frequency, moves to predefined frequency according to predefined.
Step 03:CR wireless communication system is normally runed at subsequent use frequency.
Predefined fast frequency point transfer parameter is upgraded in CR radio communication system base station and terminal after the normal operation of subsequent use frequency, like subsequent use frequency point information etc.
The workflow of base station that adopts CR wireless communication system of the present invention is shown in Fig. 3 A, and is specific as follows:
Step 11: the base station according to system requirements, is selected suitable working frequency points N, and is worked at frequency N through frequency spectrum perception and spectrum analysis;
Step 12: the signaling or the message of carrying predefined frequency transfer parameter is sent in the base station to the terminal;
Step 13: the authoring system signal is detected at current working frequency N in the base station;
Step 14: judge whether to detect the authoring system signal, if, then arrive step 15, otherwise, to step 13;
Step 15: the base station is sent the SSIS sequence that triggering terminal is carried out the frequency migration at current working frequency N to the terminal;
Step 16: the base station discharges frequency N, and working frequency points is moved to subsequent use frequency M, restarts operation at subsequent use frequency M.
The workflow of base station that adopts CR wireless communication system of the present invention is shown in Fig. 3 B, and is specific as follows:
Step 21: work at frequency N in the terminal;
Step 22: the terminal receives signaling or the message that send the base station, from this signaling or message, obtains predefined frequency transfer parameter and preservation;
Step 23: the terminal receives at current working frequency N and detects the SSIS sequence;
Step 24: judge whether to detect the SSIS sequence, if, then arrive step 25, otherwise, to step 23;
Step 25: the frequency migration is carried out according to the frequency transfer parameter in the terminal.
In order to specify the course of work of the present invention more, consider LTE (CR-LTE) system of operation at the employing cognitive radio technology of 700MHz radio and television frequency range.In order to guarantee the proper communication of authoring systems such as radio and television; When the CR-LTE system finds the authoring system of 700MHz radio and television frequency range in current working frequency; Need in time to discharge current working frequency, set up the sub-district, and timely and effectively notify its terminal use to carry out the frequency migration at new frequency.The flow process that adopts CR-LTE of the present invention system is shown in Fig. 3 C.
Step according to the front can be found out: when authoring system occurred, the CR radio communication system base station sent the SSIS sequence and notifies its terminal use to carry out predefined frequency migration; The terminal use adopts sequence detecting method to detect the SSIS sequence, and triggers predefine frequency transition process.When authoring system occurred, the CR wireless communication system had been under the strong jamming of authoring system, adopted the SSIS sequence to carry out frequency migration indication, can improve the probability that CR radio communication system terminal user successfully detects frequency migration indication.CR radio communication system terminal user in time discharges current working frequency on the one hand, reduces the interference to authoring system, satisfies index release time; The CR wireless communication system user is moved to predefined frequency according to predefined mode on the other hand, can guarantee the continuity of CR radio communication system terminal customer service, satisfies the service outage duration index.
In addition, the CR wireless communication system can further improve frequency migration through the design of SSIS sequence and indicate the probability that successfully transmits.On the one hand the resource location information of SSIS sequence can be static also can be dynamic-configuration; On the other hand SSIS sequence type and serial number information can be static also can be dynamic-configuration.
In order to guarantee the correct reception of SSIS sequence under authoring system strong jamming condition, the CR radio communication system base station can be according to the transmission number of times of the interference strength adjustment SSIS sequence of authoring system and power etc.
The SSIS sequences Design of CR wireless communication system answers concrete property such as frame structure and the physical channel of coupling system to realize, guarantees to switch the promptness and the robustness of indication notice on the one hand; To reduce change on the other hand to the existing system agreement as far as possible.
For example in the CR-LTE system; The SSIS sequence need combine wireless frame structure, physical channel and the signal transmission form etc. of traditional LTE to design, and basic principle is: select the down physical channel carrying SSIS sequence that transmission robustness is strong and UE all connection status detect at first.The PCFICH channel (Physical Control Format Indicator Channel) of LTE system is a downlink physical control channel; Carry 2 bit control format indication information (Control Format Indication; CFI), be used to the OFDM number of symbols of indicating current descending sub frame control area to take.The correct CFI of detection is the correct precondition that detects of descending control signaling and Data Receiving, so the design of the PCFICH of LTE system has very strong robustness, therefore adopts PCFICH channel bearing SSIS sequence can guarantee the robustness of SSIS sequence transmission.Because the control area size of each subframe has at most maybe in 3; And the CFI information of 2 bits can be indicated 4 kinds of states; When wherein being arranged, a kind of state reserves; As shown in table 1, therefore utilize the sequence of the state CFI=4 that reserves to carry the SSIS sequence, can reduce and introduce of the influence of CR technology original LTE agreement.
Table 1
In the CR-LTE system, adopt the core concept of PCFICH channel bearing SSIS sequence to be: the sequence of the CFI=4 of the reservation among the down physical channel PCFICH in the LTE system is defined as the SSIS sequence.
In the CR-LTE system; Adopt the performing step of PCFICH channel bearing SSIS sequence to be: when authoring system was found in current working frequency in the CR-LTE base station, the sequence that triggers at the PCFICH of current working frequency channel transmission CFI=4 was that 32 bits are 0 SSIS sequence; When UE when the PCFICH channel receives the sequence of CFI=4, trigger the frequency transition process, discharge current frequency, and move to predefined frequency according to predefined mode.
In addition, in order to improve the probability that UE under the authoring system strong jamming condition successfully detects the SSIS sequence, CR-LTE can adjust number of times that the SSIS sequence sends and power etc. according to interference strength; Also can the length of SSIS sequence be increased in order to reduce false alarm probability, with the sequence regulation SSIS sequence of CFI=4 among a plurality of PCFICH.
Shown in Fig. 3 C, idiographic flow is following:
Step 31: the outer detection is with in the base station, produces the frequency transfer parameter according to testing result, comprises subsequent use frequency tabulation etc.; According to resource allocation status the resource location of transmission SSIS sequence and the descriptor of SSIS sequence are set;
Step 32: frequency transfer parameter and the resource location information of sending the SSIS sequence and the descriptor of SSIS sequence are sent to the terminal in the base station;
Step 33: the terminal receives and storage frequency transfer parameter, the resource location information of SSIS sequence and the descriptor of SSIS sequence;
Step 34: the base station is with outer the detection again, produces new frequency transfer parameter according to testing result, comprises subsequent use frequency tabulation etc.;
Step 35: new frequency transfer parameter is sent to the terminal in the base station;
Step 36: the frequency transfer parameter that the terminal will have been stored is updated to the new frequency transfer parameter that receives;
Step 37: interior detection is with in the base station, detects the authoring system signal in current working frequency, discharges current working frequency, sets up new sub-district at subsequent use frequency;
Step 38: the base station is sent the SSIS sequence at above-mentioned resource location to the terminal, can send one or many;
Step 39: frequency migration flow process is triggered in the terminal after above-mentioned resource location detects the SSIS sequence, discharge current working frequency, and according to the frequency transfer parameter current working frequency is moved to new subsequent use frequency.
Referring to Fig. 4, the embodiment of the invention also provides a kind of CR wireless communication system, and this system comprises:
Referring to Fig. 5, the embodiment of the invention also provides the trigger equipment of the frequency migration in a kind of CR wireless communication system, and this device comprises:
Frequency migration trigger element 51 is used for when current working frequency detects the signal of authoring system, sends to the terminal at predefined resource location and triggers the SSIS sequence that the frequency migration is carried out at this terminal.
Said information transmitting unit 50 also is used for:
More new terminal carries out the frequency transfer parameter that the frequency migration is adopted, and sends the frequency transfer parameter after upgrading to the terminal.
Said information transmitting unit 50 also is used for:
Send the information of said resource location and/or the descriptor of said SSIS sequence to the terminal.
Said information transmitting unit 50 also is used for: upgrade and send the employed resource location of SSIS sequence, and send the information of the resource location after upgrading to the terminal.
Said information transmitting unit 50 also is used for: the renewal triggering terminal is carried out frequency and is moved employed SSIS sequence, and sends the descriptor of the SSIS sequence after upgrading to the terminal.
Said frequency migration trigger element 51 is used for:
When current working frequency detects the signal of authoring system; Confirm the signal interference strength of said authoring system to said CR system; Confirm number of times and transmitted power according to this interference strength, and trigger the SSIS sequence that the frequency migration is carried out at this terminal according to confirming that the result sends to the terminal at predefined resource location to terminal transmission SSIS sequence.
Said frequency transfer parameter comprises: the information of subsequent use frequency and/or frequency transit time information; The information of said subsequent use frequency is the information of the frequency that can move to of terminal; Said frequency transit time information is the temporal information that the frequency migration is carried out at the terminal.
When said CR wireless communication system was the LTE system, said resource location was positioned at PCFICH.Said SSIS sequence is that call number is 4 CFI sequence.
Referring to Fig. 6, the embodiment of the invention also provides the frequency moving apparatus in a kind of CR wireless communication system, and this device comprises:
Frequency transfer parameter receiving element 60 is used to receive the frequency transfer parameter of sending the base station, preserves this frequency transfer parameter;
Said frequency migration units 61 is used for:
When said frequency transfer parameter comprises the information of subsequent use frequency, discharge current working frequency points, and move to said subsequent use frequency.
Said frequency migration units 61 is used for: when said frequency transfer parameter also comprises frequency transit time information, in indicated time, move to said subsequent use frequency at said frequency transit time.
Said frequency transfer parameter receiving element 60 also is used for: receive the information of the resource location that sends the base station and/or the descriptor of SSIS sequence;
Said frequency migration units 61 is used for: the SSIS sequence is indicated in the described frequency migration of said descriptor in that said resource location base stations detected is sent.
When said CR wireless communication system was the LTE system, said resource location was positioned at PCFICH.Said SSIS sequence is that call number is 4 CFI sequence.
Frequency migration trigger equipment in the CR wireless communication system in the embodiment of the invention specifically can be network equipments such as base station, and the frequency moving apparatus in the CR wireless communication system in the embodiment of the invention specifically can be terminal side equipments such as terminal.
To sum up, beneficial effect of the present invention comprises:
In the scheme that the embodiment of the invention provides; The base station of CR wireless communication system is carried out the frequency transfer parameter that frequency migration adopted with the terminal in advance and is sent to the terminal; And when current working frequency detects the signal of authoring system; Send the SSIS sequence that the frequency migration is carried out at this terminal of triggering to the terminal; Frequency migration just can be carried out according to the frequency transfer parameter that receives in the terminal when detecting this SSIS sequence, and realize alternately that through the sub-district hand off signaling of complicacy the frequency migration compares in the prior art, and the present invention effectively raises the promptness that the CR terminal of wireless communication system is carried out the frequency migration.
And; The scheme that the embodiment of the invention provides adopts the SSIS sequence to carry out the frequency migration indication of frequency migration as triggering terminal; Can improve the probability that the CR terminal of wireless communication system successfully detects frequency migration indication, and then effectively improve the robustness of notice terminal frequency migration.
To sum up; The scheme that the present invention proposes can improve the promptness and the robustness of CR wireless communication system frequency migration indication notice when finding authoring system; Shorten CR frequency points of wireless communication system transit time; Thereby reduce influence, and reduce the break period of CR wireless communication system business authoring system.What the present invention provided realizes and can guarantee that above advantage reduces the change to existing LTE agreement simultaneously based on the concrete fast frequency point migration triggering method of LTE and the concrete design of frequency migration indicator sequence.The scheme that the present invention proposes is equally applicable to other and is operated in the cognition radio communication system and the terminal of authorizing frequency range.
The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out through the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in ability vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work; Make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device; Make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of on computer or other programmable devices, carrying out is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic inventive concept could of cicada, then can make other change and modification to these embodiment.So accompanying claims is intended to be interpreted as all changes and the modification that comprises preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (33)
1. the migration of the frequency in cognitive radio CR wireless communication system triggering method is characterized in that this method comprises:
Confirm that the terminal carries out the frequency transfer parameter that frequency migration is adopted, and send this frequency transfer parameter to the terminal;
When current working frequency detects the signal of authoring system, send the frequency migration indication SSIS sequence that the frequency migration is carried out at this terminal of triggering to the terminal at predefined resource location.
2. the method for claim 1 is characterized in that, after this frequency transfer parameter is sent at the terminal, this method further comprises:
More new terminal carries out the frequency transfer parameter that the frequency migration is adopted, and sends the frequency transfer parameter after upgrading to the terminal.
3. according to claim 1 or claim 2 method is characterized in that, when this frequency transfer parameter is sent at the terminal, this method further comprises:
Send the information of said resource location and/or the descriptor of said SSIS sequence to the terminal.
4. method as claimed in claim 3 is characterized in that, after sending the information of said resource location to the terminal, this method further comprises:
Upgrade and send the employed resource location of SSIS sequence, and send the information of the resource location after upgrading to the terminal.
5. method as claimed in claim 3 is characterized in that, after sending the descriptor of said SSIS sequence to the terminal, this method further comprises:
The renewal triggering terminal is carried out frequency and is moved employed SSIS sequence, and sends the descriptor of the SSIS sequence after upgrading to the terminal.
6. the method for claim 1 is characterized in that, saidly sends the SSIS sequence at predefined resource location to the terminal and comprises:
Confirm the signal interference strength of said authoring system, confirm to send the number of times and the transmitted power of SSIS sequence to the terminal according to this interference strength to said CR system, and according to definite result at predefined resource location to terminal transmission SSIS sequence.
7. like arbitrary described method among claim 1-2, the 4-6, it is characterized in that the information of said frequency transfer parameter comprises: the information of subsequent use frequency and/or frequency transit time information;
The information of said subsequent use frequency is the information of the frequency that can move to of terminal; Said frequency transit time information is the temporal information that the frequency migration is carried out at the terminal.
8. like arbitrary described method among claim 1-2, the 4-6, it is characterized in that when said CR wireless communication system was Long Term Evolution LTE system, said resource location was positioned at Physical Control Format Indicator Channel PCFICH.
9. method as claimed in claim 8 is characterized in that, said SSIS sequence is that call number is 4 control format indication CFI sequence.
10. the frequency moving method in the cognitive radio CR wireless communication system is characterized in that this method comprises:
Receive the frequency transfer parameter that send the base station, preserve this frequency transfer parameter;
The SSIS sequence is indicated in frequency migration in that predefined resource location base stations detected is sent, and when detecting this SSIS sequence, carries out the frequency migration according to said frequency transfer parameter.
11. method as claimed in claim 10 is characterized in that, said frequency transfer parameter comprises: the information of subsequent use frequency; Saidly carry out frequency migration according to said frequency transfer parameter and comprise:
Discharge current working frequency points, and move to said subsequent use frequency.
12. method as claimed in claim 11 is characterized in that, said frequency transfer parameter also comprises: frequency transit time information; Saidly move to said subsequent use frequency and comprise:
In indicated time, move to said subsequent use frequency at said frequency transit time.
13. method as claimed in claim 10 is characterized in that, when receiving the frequency transfer parameter of sending the base station, this method further comprises:
Receive the information of the resource location that sends the base station and/or the descriptor of SSIS sequence;
Said frequency migration indication SSIS sequence of sending in predefined resource location base stations detected comprises:
The SSIS sequence is indicated in the described frequency migration of said descriptor in that said resource location base stations detected is sent.
14., it is characterized in that when said CR wireless communication system was Long Term Evolution LTE system, said resource location was positioned at Physical Control Format Indicator Channel PCFICH like arbitrary described method among the claim 10-13.
15. method as claimed in claim 14 is characterized in that, said SSIS sequence is that call number is 4 control format indication CFI sequence.
16. the migration of the frequency in cognitive radio CR wireless communication system trigger equipment is characterized in that this device comprises:
Information transmitting unit is used for definite terminal and carries out the frequency transfer parameter that the frequency migration is adopted, and sends this frequency transfer parameter to the terminal;
Frequency migration trigger element is used for when current working frequency detects the signal of authoring system, sends to the terminal at predefined resource location and triggers the frequency migration indication SSIS sequence that the frequency migration is carried out at this terminal.
17. device as claimed in claim 16 is characterized in that, said information transmitting unit also is used for:
More new terminal carries out the frequency transfer parameter that the frequency migration is adopted, and sends the frequency transfer parameter after upgrading to the terminal.
18., it is characterized in that said information transmitting unit also is used for like claim 16 or 17 described devices:
Send the information of said resource location and/or the descriptor of said SSIS sequence to the terminal.
19. device as claimed in claim 18 is characterized in that, said information transmitting unit also is used for:
Upgrade and send the employed resource location of SSIS sequence, and send the information of the resource location after upgrading to the terminal.
20. device as claimed in claim 18 is characterized in that, said information transmitting unit also is used for:
The renewal triggering terminal is carried out frequency and is moved employed SSIS sequence, and sends the descriptor of the SSIS sequence after upgrading to the terminal.
21. device as claimed in claim 16 is characterized in that, said frequency migration trigger element specifically is used for:
When current working frequency detects the signal of authoring system; Confirm the signal interference strength of said authoring system to said CR system; Confirm number of times and transmitted power according to this interference strength, and trigger the SSIS sequence that the frequency migration is carried out at this terminal according to confirming that the result sends to the terminal at predefined resource location to terminal transmission SSIS sequence.
22., it is characterized in that said frequency transfer parameter comprises like arbitrary described device among claim 16-17, the 19-21: the information of subsequent use frequency and/or frequency transit time information;
The information of said subsequent use frequency is the information of the frequency that can move to of terminal; Said frequency transit time information is the temporal information that the frequency migration is carried out at the terminal.
23., it is characterized in that when said CR wireless communication system was Long Term Evolution LTE system, said resource location was positioned at Physical Control Format Indicator Channel PCFICH like arbitrary described device among claim 16-17, the 19-21.
24. device as claimed in claim 23 is characterized in that, said SSIS sequence is that call number is 4 control format indication CFI sequence.
25. the frequency moving apparatus in the cognitive radio CR wireless communication system is characterized in that this device comprises:
Frequency transfer parameter receiving element is used to receive the frequency transfer parameter of sending the base station, preserves this frequency transfer parameter;
The frequency migration units, the SSIS sequence is indicated in the frequency migration that is used for sending in predefined resource location base stations detected, and when detecting this SSIS sequence, carries out the frequency migration according to said frequency transfer parameter.
26. device as claimed in claim 25 is characterized in that, said frequency migration units specifically is used for:
When said frequency transfer parameter comprises the information of subsequent use frequency, discharge current working frequency points, and move to said subsequent use frequency.
27. device as claimed in claim 26 is characterized in that, said frequency migration units specifically is used for:
When said frequency transfer parameter also comprises frequency transit time information, in indicated time, move to said subsequent use frequency at said frequency transit time.
28. device as claimed in claim 25 is characterized in that, said frequency transfer parameter receiving element also is used for:
Receive the information of the resource location that sends the base station and/or the descriptor of SSIS sequence;
Said frequency migration units specifically is used for:
The SSIS sequence is indicated in the described frequency migration of said descriptor in that said resource location base stations detected is sent.
29., it is characterized in that when said CR wireless communication system was Long Term Evolution LTE system, said resource location was positioned at Physical Control Format Indicator Channel PCFICH like arbitrary described device among the claim 25-28.
30. device as claimed in claim 29 is characterized in that, said SSIS sequence is that call number is 4 control format indication CFI sequence.
31. a cognitive radio CR wireless communication system is characterized in that this system comprises:
The base station is used for definite terminal and carries out the frequency transfer parameter that the frequency migration is adopted, and sends this frequency transfer parameter to the terminal; When current working frequency detects the signal of authoring system, send the frequency migration indication SSIS sequence that the frequency migration is carried out at this terminal of triggering to the terminal at predefined resource location;
The terminal is used to receive the frequency transfer parameter of sending the base station, preserves this frequency transfer parameter; The SSIS sequence is indicated in frequency migration in that predefined resource location base stations detected is sent, and when detecting this SSIS sequence, carries out the frequency migration according to said frequency transfer parameter.
32. a base station is characterized in that, this base station comprises arbitrary described device among the claim 16-24.
33. a terminal is characterized in that, this terminal comprises arbitrary described device among the claim 25-30.
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| CN102457928B (en) | 2015-08-05 |
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