CN102457929A - Frequency point migration triggering method and equipment, frequency point migration method and system, and equipment - Google Patents
Frequency point migration triggering method and equipment, frequency point migration method and system, and equipment Download PDFInfo
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Abstract
The embodiment of the invention discloses a frequency point migration triggering method, frequency point migration triggering equipment, a frequency point migration method, a frequency point migration system and equipment, relates to the technical field of radio communication and is used for improving the timeliness and the robustness of frequency point migration of a cognitive radio (CR) radio communication system. In the invention, a backup frequency point list is sent to a terminal, and when a current frequency point detects a signal of an authorized system, information for triggering the terminal to migrate the frequency point is sent to the terminal through a physical downlink control channel (PDCCH); the backup frequency point list sent by a base station is received and stored; the information which is sent by the base station and used for triggering the terminal to migrate the frequency point is detected in the PDCCH; and when the information is detected, the working frequency point is migrated to an available frequency point in the backup frequency point list. By the invention, the timeliness and the robustness of frequency point migration of the CR radio communication system can be improved effectively.
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
Development fast along with the mobile communication cause; The growing broadband wireless communications demand and the contradiction of limited frequency spectrum resource become clear day by day; Though adopted OFDM (OFDM), multiple-input and multiple-output technology such as (MIMO) to improve the availability of frequency spectrum in Long Term Evolution (LTE) system, these can not fundamentally solve the problem of limited frequency spectrum resource.Along with mobile service in development at full speed in future, telecom operators will face severeer frequency spectrum resource problem of shortage, on the other hand, the frequency spectrum of some wireless systems uses on time and region the almost free time.Particularly for the radio and television frequency range, along with radio data system from the development of analogue transmission to Digital Transmission because Digital Transmission can improve transmission capacity greatly, make a lot of radio and television frequency ranges be in idle condition for a long time, wasted valuable Radio Resource.
Statistics was once done to the situation that takies of frequency spectrum by a lot of mechanisms, showed that present a lot of frequency spectrums are not fully utilized.2002, (Federal Communications Commission FCC) did measurement to the frequency spectrum operating position of the U.S., and its report shows typical channel spectrum utilization rate generally less than 15%, and was the highest by also just 85% in FCC.And recently, statistics was done to the frequency spectrum operating position in area, Shanghai by Shanghai Research Center For Wireless Communications, and 698MHz is about 30% to the frequency spectrum utilization rate of 806MHz, and Beijing University of Post & Telecommunication also did similarly and measures, and also drew approximate conclusion.
For telecom operators, the UHF signal has good propagation characteristic, and bigger radius of society can be provided, and improves the throughput of Cell Edge User.For the covering in rural area or meagrely-populated area, use UHF to compare and use the 2GHz frequency range, can effectively reduce the networking cost of telecom operators, embody better economic benefit.On the one hand, some radio and television frequency ranges are in long-term idle condition, and on the other hand, telecom operators hope to cover vast rural area with lower cost, to save social resources.But under fixing at present spectrum allocation may policy, telecom operators can not use the radio and television frequency range, do not withdraw from the market fully because some regional simulated televisions are technological, so can not change existing spectrum allocation may policy within the short-term.
For solving frequency spectrum resource problem in short supply, new radiotechnics is that cognitive radio (CognitiveRadio, CR) paid close attention to widely by technology.Cognitive radio technology is proposed in 1999 by Joseph Mitola the earliest, and through the development in 10 years, it obtained the generally approval of science and industrial quarters, was a kind of present frequency spectrum resource effective means in short supply that solves.Through cognitive radio technology, radio system can be according to its operational environment, and its running parameter of adaptive adjustment is to satisfy the needs of self.Cognitive radio matches with software radio, can implement frequency spectrum use flexibly, realizes sharing of frequency spectrum, improves the service efficiency of frequency spectrum.
For typical cognitive radio system, generally suppose the authoring system operate as normal on certain mandate frequency range, cognitive system detects the frequency spectrum operating position of authoring system; When finding not work of authoring system, when authorizing frequency range idle, cognitive system is used this mandate frequency range; And continuation detects the operating state of this frequency range authoring system; Restart work in case find authoring system, then withdraw from this frequency range, and transfer to new frequency range and work on.In whole flow process, cognitive system need be accomplished frequency spectrum perception, spectrum management, spectral transition, frequency spectrum share.Wherein frequency spectrum perception obtains wireless environmental information; And spectrum management is according to the radio environment information that obtains available frequency range to be made corresponding management, to improve the efficient that frequency spectrum uses; When authoring system was started working, cognitive system was the serious interference of avoiding main user, need transfer to new working frequency range; Cognitive system also need be shared cognitive frequency range with other cognitive system.
For carrier wave communication system; Spectral transition can adopt the frequency migration pattern; Just after the base station detects authoring system and starts working; Send frequency migration order to all terminals, this sub-district, the base station all almost switches to a new available frequency simultaneously with all terminals, this sub-district and works on, thereby avoids the interference to authoring system.
In the LTE system, frequency migration generally realizes through the hand off signaling of complicacy alternately, wherein the base station of LTE system and terminal (UE) aloft the Signalling exchange of interface comprise:
Step 1: the base station in the source frequency UE is measured control;
Step 2: frequency scheduling UE carries out reporting measuring result in the source in the base station, judges the target frequency of UE migration according to measurement result;
Step 3: the base station is frequency scheduling UE in the source, sends Radio Resource control (RRC) to UE and connects reallocation message (RRC Connection Reconfiguration), wherein comprises mobility control information (MobilityControlInformation);
Step 4:UE carries out synchronously at the target frequency, sends lead code (preamble);
Step 5: the base station 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 connectionReconfiguration complete).
Wherein, comprise the exclusive configuration in Target cell ID, carrier frequency point, bandwidth and sub-district and insert relevant configuration etc. at random in the MobilityControlInformation information.
In the LTE system, Physical Downlink Control Channel (PDCCH) bearing downlink control information (DCI, Downlink Control Information) comprises information such as the schedule information of descending and transmitting uplink data and uplink power control.Different according to the purposes and the information content, DCI is divided into different forms, like following table 1:
Table 1
At physical layer process process such as Fig. 1 of base station side PDCCH, in the DCI of PDCCH, pass through Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C-RNTI) scrambling at terminal is arrived the mode of the CRC (CRC) of 16bit, with the targeted customer of this DCI transmission of implicit identification.In a descending sub frame, a plurality of DCI are parallel to encode and the rate-matched process, after coded-bit is multiplexed into a PDCCH and goes up, in operations such as carrying out scrambling jointly, modulate and interweave.
According to the DCI bit length and the channel conditions that carry, control channel unit (CCE) the polymerization grade (CCE Aggregation Level) that PDCCH selects can select 1,2,4 or 8.End side because and do not know DCI Format and the CCE polymerization grade that base station side is sent, so need carry out blind check to PDCCH.Defined the search volume of PDCCH blind check in the standard; Comprise the exclusive search volume of common search space and UE; The common search space is all terminals share in the sub-district, first CCE since a sub-frame, and CCE polymerization class 4 and 8 need be attempted in the terminal in this space.The exclusive search volume of UE comprises all possible CCE polymerization grade to each terminal.Exclusive search volume, terminal original position under a kind of CCE polymerization grade hypothesis is by the decisions such as RNTI at subframe numbering, terminal.
In realizing process of the present invention, the inventor finds to exist in the prior art following technical problem:
If the LTE system works of single carrier is unauthorized frequency range (being cognitive frequency range); After the authoring system signal occurs; The base station of LTE system at first detects authoring system and starts working; And issue frequency migration order indicating terminal frequency and move to new frequency; Need issue RRCConnection Reconfiguration message in the cell-of-origin in the frequency migration, wherein carry the new frequency that MobilityControlInformation information indication cognitive system need be transferred to, and the relevant parameter on new working frequency points.But this moment, authoring system was started working; The same frequency that LTE equipment possibly face the different system of full bandwidth disturbs; If different system same frequency interference level is very high; Will cause RRC Connection Reconfiguration information in time not received even and can be received by the terminal, cause the frequency migration in time to accomplish, the whole Zone of LTE interrupts.Because this moment, source cell base station was changed its working frequency points, so the sub-district can't be found at former frequency in the terminal, had only search network again.Operator generally can only hold hundreds of milliseconds customer service interrupts, and the long service disconnection brought of search network will influence user experience again.
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:
Send subsequent use frequency tabulation to the terminal, comprise the information of the detected available frequency in base station in this subsequent use frequency tabulation;
When current working frequency detects the signal of authoring system, send the information that the frequency migration is carried out at this terminal that triggers to the terminal through PDCCH.
Frequency migration trigger equipment in a kind of CR wireless communication system, this device comprises:
The tabulation transmitting element is used for sending subsequent use frequency tabulation to the terminal, comprises the information of the detected available frequency in base station in this subsequent use frequency tabulation;
Frequency migration trigger element is used for when current working frequency detects the signal of authoring system, sends the information that the frequency migration is carried out at this terminal that triggers through PDCCH to the terminal.
A kind of base station, this base station comprise the frequency migration trigger equipment in the said CR wireless communication system.
In this programme, send subsequent use frequency tabulation, comprise the information of the detected available frequency in base station in this subsequent use frequency tabulation to the terminal; When current working frequency detects the signal of authoring system, send the information that the frequency migration is carried out at this terminal that triggers to the terminal through PDCCH.With carry out the frequency migration through the sub-district hand off signaling notice terminal 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.And this programme carries out the frequency migration through the PDCCH triggering terminal, can improve the CR terminal of wireless communication system and successfully detect the probability that the information of frequency migration is carried out at this terminal of triggering, and then effectively improve the robustness of notice terminal frequency migration.
The embodiment of the invention also 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 subsequent use frequency tabulation that send the base station, comprise the information of the detected available frequency in base station in this subsequent use frequency tabulation;
The information of carrying out the frequency migration at this terminal of triggering that the PDCCH base stations detected is sent, and when detecting this information, working frequency points is moved to the available frequency in the said subsequent use frequency tabulation.
Frequency moving apparatus in a kind of CR wireless communication system, this device comprises:
The list information receiving element is used to receive the subsequent use frequency tabulation that send the base station, comprises the information of the detected available frequency in base station in this subsequent use frequency tabulation;
The frequency migration units is used for carrying out at this terminal of triggering that the PDCCH base stations detected is sent the information of frequency migration, and when detecting this information, working frequency points is moved to the available frequency in the said subsequent use frequency tabulation.
A kind of CR wireless communication system, this system comprises:
The base station is used for sending subsequent use frequency tabulation to the terminal, comprises the information of the detected available frequency in base station in this subsequent use frequency tabulation; When current working frequency detects the signal of authoring system, send the information that the frequency migration is carried out at this terminal that triggers to the terminal through PDCCH;
The terminal is used to receive the subsequent use frequency tabulation that send the base station; The information of carrying out the frequency migration at this terminal of triggering that the PDCCH base stations detected is sent, and when detecting this information, working frequency points is moved to the available frequency in the said subsequent use frequency tabulation.
A kind of terminal, this terminal comprise the frequency moving apparatus in the said CR wireless communication system.
In this programme, receive and preserve the subsequent use frequency tabulation that send the base station; The information of carrying out the frequency migration at this terminal of triggering that the PDCCH base stations detected is sent, and when detecting this information, working frequency points is moved to the available frequency in the said subsequent use frequency tabulation.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 of carrying out the frequency migration in the CR wireless communication system.And this programme carries out the frequency migration through the PDCCH triggering terminal, 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
Fig. 1 is a PDCCH handling process sketch map of the prior art;
The method flow sketch map that Fig. 2 provides for the embodiment of the invention;
Another method schematic flow sheet that Fig. 3 provides for the embodiment of the invention;
Fig. 4 is the method flow sketch map of the embodiment of the invention;
The system configuration sketch map that Fig. 5 provides for the embodiment of the invention;
The architecture of base station sketch map that Fig. 6 provides for the embodiment of the invention;
The terminal structure sketch map that Fig. 7 provides for the embodiment of the invention.
Embodiment
In order to improve the promptness and the robustness of carrying out the frequency migration in the CR wireless communication system; The embodiment of the invention provides the frequency migration in a kind of CR wireless communication system to trigger and the frequency moving method; In this method; The base station is sent the information that triggering terminal is carried out the frequency migration through PDCCH to the terminal, subsequent use frequency tabulation the carrying out frequency migration that send according to the base station when detecting this information in advance at the terminal.
Referring to Fig. 2, 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 20: subsequent use frequency tabulation is sent to the terminal in the base station, comprises the information of the detected available frequency in base station in this subsequent use frequency tabulation;
Step 21: when the base station detects the signal of authoring system in current working frequency, send the information that the frequency migration is carried out at this terminal that triggers to the terminal through PDCCH.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 20, subsequent use frequency tabulation is sent to the terminal in the base station, and its concrete realization can be following:
The frequency spectrum detection analysis is carried out in the base station, confirms available frequency according to frequency spectrum detection analysis result and system requirements, deposits the information of the available frequency of confirming in subsequent use frequency tabulation; Available frequency in the subsequent use frequency tabulation is carried out prioritization; Subsequent use frequency tabulation after the prioritization is sent to the terminal.
Here, frequency spectrum detection is carried out when analyzing in the base station, detects the frequency range of this current use in base station, simultaneously with the operating state of certain bandwidth detection at other frequency authoring systems, and analyzes the noise jamming level of these frequencies.Then; According to the frequency spectrum detection analysis result; And deposit available frequency and bandwidth in subsequent use frequency base station according to system requirements and survey tabulation, and preset the corresponding work parameter for each frequency, this running parameter comprises bandwidth, code length, code rate, modulation system parameter etc.Then, by bandwidth, interfere with water equality is carried out prioritization, and the available frequency in the tabulation is carried out index number according to priority with the available frequency in the subsequent use frequency tabulation.Again tabulation is surveyed in subsequent use frequency base station and send to the terminal, perhaps survey maps and go out corresponding subsequent use frequency end side tabulation, should subsequent use frequency end side tabulation send to all terminals, this sub-district through PBCH according to subsequent use frequency base station through PBCH.
The base station can periodically update the subsequent use frequency tabulation that need send to the terminal, and the subsequent use frequency tabulation after will upgrading sends to the terminal, the local existing subsequent use frequency tabulation of the new subsequent use frequency list update that the terminal utilization receives.For example, when the base station confirms that through the frequency spectrum detection analysis variation has taken place available frequency, can be subsequent use the information of available frequency in the frequency tabulation.
In the step 21, the base station is sent to the terminal through PDCCH and is triggered the information that the frequency migration is carried out at this terminal, and its concrete realization can be following:
At first, base station information that triggering terminal is carried out frequency migration is encoded according to the DCI form;
Then; CRC (CRC) is added for the DCI that obtains after encoding in the base station; And (Cognitive Radio-RNTI CR-RNTI) carries out scrambling to this CRC, and the DCI after the scrambling is sent to the terminal through PDCCH to use the cognitive radio Radio Network Temporary Identifier; This CR-RNTI is the RNTI that system reserves.
The information that above-mentioned triggering terminal is carried out the frequency migration can take one or more information bits position.Above-mentioned DCI form can adopt the DCI form of any existing or redetermination such as Format 1C.
When the DCI of base station after with scrambling sends to the terminal through PDCCH, can adopt fixing control channel unit (CCE) polymerization grade, the DCI after fixing logical place is with scrambling sends to the terminal through PDCCH.
Here, CCE polymerization grade is the parameter that is used to limit the number of sending the employed CCE of DCI, corresponding 36 Resource Units (RE) of each CCE, and CCE polymerization grade is high more, and the number of the CCE that then uses is big more.For example, be 4 o'clock in CCE polymerization grade, the number of sending the employed CCE of DCI is 4, can send DCI this moment on numbering is respectively 0,1,2 and 3 CCE, also can on numbering is respectively 4,5,6 and 7 CCE, send DCI, by that analogy, or the like.Again for example; In CCE polymerization grade is 8 o'clock; The number of sending the employed CCE of DCI is 8, and can send DCI this moment on numbering is respectively 0,1,2,3,4,5,6 and 7 CCE, also can on numbering is respectively 8,9,10,11,12,13,14 and 15 CCE, send DCI; By that analogy, or the like.
Above-mentioned logical place is meant the position of sending the employed CCE of DCI.For example, be 4 in CCE polymerization grade, and be respectively when sending DCI on 0,1,2 and 3 the CCE that numbering is respectively 0,1,2 and 3 CCE and is the logical place that sends DCI in numbering.Again for example, be 8 in CCE polymerization grade, and be respectively when sending DCI on 0,1,2,3,4,5,6 and 7 the CCE that numbering is respectively 0,1,2,3,4,5,6 and 7 CCE and is the logical place that sends DCI in numbering.
Above-mentioned CCE polymerization grade can be the highest CCE polymerization grade of system's support.Above-mentioned logical place can be the corresponding lowest logical position of said CCE polymerization grade.
Here, the corresponding lowest logical position of CCE polymerization grade is meant the minimum a series of CCE of initial CCE numbering in the corresponding logical place of this CCE polymerization grade.For example; In CCE polymerization grade is 4 o'clock; Can on numbering is respectively 0,1,2 and 3 CCE, send DCI, also can on numbering is respectively 4,5,6 and 7 CCE, send DCI, then numbering is respectively 0,1,2 and 3 CCE and is the corresponding lowest logical position of this CCE polymerization grade.
When the DCI of base station after with scrambling sends to the terminal through PDCCH, can the DCI continuous several times after the scrambling be sent to the terminal through PDCCH.
The base station also need discharge current working frequency in the step 21 when current working frequency detects the signal of authoring system, chooses the available frequency in the subsequent use frequency tabulation, sets up new sub-district at this available frequency.
Referring to Fig. 3, the frequency moving method in the CR wireless communication system that the embodiment of the invention provides specifically may further comprise the steps:
Step 30: the terminal receives the subsequent use frequency tabulation that send the base station; The information that comprises the detected available frequency in base station in this subsequent use frequency tabulation; Can also comprise the corresponding running parameter of each available frequency, this running parameter comprises bandwidth, code length, code rate, modulation system parameter etc.;
Step 31: the information that the frequency migration is carried out at this terminal of triggering that the PDCCH base stations detected is sent in the terminal, and when detecting this information, working frequency points is moved to the available frequency in the subsequent use frequency tabulation.
Concrete, the concrete realization of step 31 can be following:
The DCI that uses the CR-RNTI scrambling is detected at the terminal at PDCCH; This CR-RNTI is the RNTI that system reserves; Decipher detected DCI when detecting this DCI at the terminal, from subsequent use frequency tabulation, selects an available frequency according to the effective information position that decoding obtains, and working frequency points is moved to this available frequency.
An available frequency is selected in the above-mentioned effective information position that obtains according to decoding from said subsequent use frequency tabulation, its concrete realization can be adopted following dual mode:
First kind, when bit of effective information bit stealing that decoding obtains, select i available frequency in the subsequent use frequency tabulation, said i is predefined 1 the integer that is not less than;
Second kind, when a plurality of bit of effective information bit stealing that decoding obtains, select j available frequency in the subsequent use frequency tabulation, said j is indicated by said effective information position.
Above-mentioned DCI form can adopt the DCI form of any existing or redetermination such as Format 1C.
When the DCI of CR-RNTI scrambling detect to be used at PDCCH in above-mentioned terminal, can detect the DCI that uses the CR-RNTI scrambling at the fixing logical place of PDCCH according to fixing CCE polymerization grade.
Above-mentioned CCE polymerization grade can be the highest CCE polymerization grade of system's support.Above-mentioned logical place can be the corresponding lowest logical position of said CCE polymerization grade.
Specify in the face of the present invention down:
Among the present invention, because the PDCCH in the LTE system can be according to channel quality selective polymerization grade flexibly, thereby therefore the interference that can better resist authoring system increases the frequency migration that special control information is come indicating cell in DCI.When operate as normal, subsequent use frequency and relevant parameter tabulation are all preserved in base station and terminal, start working when base station side detects authoring system; Issue frequency migration order through PDCCH; After frequency migration order is received at the terminal,, in the subsequent use frequency tabulation that preserve this locality, select the indicated frequency of DCI according to the DCI indication; And working frequency points moved to this frequency continued work, as shown in Figure 4.
The present invention is specific as follows:
1bit effective information position or N bit effective information position are adopted in frequency migration order
When adopting 1bit effective information position, the base station detects authoring system start working after, send 1bit frequency migration information position to the terminal, whether indicating terminal triggers the migration of working frequency points.Frequency migration order is received at the terminal, uses the parameter migration working frequency points of i position in the subsequent use frequency tabulation, and wherein i is predetermined in advance.
When adopting 1Nbit effective information position; The base station detects authoring system start working after; Send N bits frequency migration information position to the terminal; Wherein N can be disposed by operator, and N bits information triggering terminal is utilized the information generation frequency migration of i position in the subsequent use frequency tabulation, and wherein i is indicated by N bits information.
The PDCCH DCI that carries frequency migration trigger command adopts the compatible form of present LTE, and 1bit or N bits trigger command are encoded into corresponding PDCCH DCI form length.
The PDCCH DCI that carries frequency migration trigger command can adopt the compatible at present DCI form of LTE, like Format 1C.In a single day base station side determines frequency to shift, and sends 1bit or Nbit trigger message, and it is encoded to 15bit length (if DCI adopts Format 1C).
The PDCCH DCI that carries frequency migration trigger command adopts CR-RNTI to the CRC scrambling, and wherein CR-RNTI adopts the RNTI value that keeps.
The RNTI that carries the DCI employing of frequency migration order is the RNTI value that LTE keeps, called after CR-RNTI, and with the DCI CRC scrambling of CR-RNTI to the frequency migration.
Carry the highest CCE polymerization grade that the PDCCH DCI using system of frequency migration trigger command can be supported, and the logical place transmission of fixing.And transmission that can be continuous N time, wherein N is configurable.
Because during the frequency migration, PDCCH possibly be subjected to very serious disturbance, should select than higher polymerization grade so carry the PDCCH DCI of frequency migration trigger command, in addition,, send with fixing polymerization grade for reducing the number of times that PDCCH detects.To anti-interference, the PDCCH DCI that carries frequency migration trigger command should send with the highest polymerization grade that system can support, such as the LTE system of 20MHz bandwidth, should the selective polymerization grade be 8 for effectively.The DCI that carries frequency migration order sends at fixing logical place, sends like the CCE that can use the lowest logical position, promptly uses the degree of polymerization 4, then uses { 0,1; 2, the CCE of 3} sends, if use the degree of polymerization 8, uses { 0; 1,2,3,4; 5,6,7} sends, and original position all is { 0}.
Before the PDCCH blind check,, detect with the highest CCE polymerization grade of system's support whether the PDCCH DCI that carries frequency migration trigger command is arranged at first in the fixed logic original position.
If CCE polymerization grade 8 is adopted in the base station, and send the DCI that carries the frequency migration in the lowest logical position, the terminal detected { 0,1,2,3,4,5,6, whether 7} has the DCI of frequency migration before each PDCCH blind check.To total blind check times influence is 1 time.
Decipher detected PDCCH DCI at the terminal, obtains triggering the effective information position of frequency migration.
After the PDCCH DCI that carries frequency migration order is detected, be decoded as the effective information position of 1bit or N bits, and select the migration of corresponding parameters frequency according to subsequent use frequency in terminal and parameter list.
Embodiment:
The base station of the LTE system of single carrier is operated in the 700MHz frequency range, has cognitive function, and above-mentioned functions is all supported at base station and terminal, and can be operated in a plurality of frequencies in the 700MHz frequency range.
Base station side:
Step 1: behind the opening base station,,, select suitable frequency and bandwidth to start working according to system requirements through frequency spectrum perception/spectrum analysis.
Step 2: after the operate as normal of base station, detect the frequency range that use this base station,, and analyze the noise jamming level of these frequencies simultaneously with other frequency range authoring system operating states of certain bandwidth detection.
Step 3: the base station is according to the frequency spectrum detection analysis result; And deposit available frequency and bandwidth in subsequent use frequency base station side tabulation according to system requirements; And be that each frequency is preset the corresponding work parameter; By bandwidth, interference level carries out prioritization, and will tabulate according to priority since 0 index number with frequency available in the subsequent use frequency base station side tabulation.
Step 4: tabulate according to subsequent use frequency base station side in the base station, shines upon corresponding subsequent use frequency end side tabulation, and list information is sent to all terminals, this sub-district through PBCH.
2. 3. 4. said work can periodically be pressed in the base station.
Step 5: the base station is if detecting this working frequency range authoring system starts working, then with the frequency migration of 2bit information notice terminal.The DCI that carries frequency migration order adopts Format 1C form, and 2bits frequency migration information is mapped as Index m, and is encoded to 15bits, its corresponding relation such as following table 2:
Table 2
Step 6: in next subframe base station Index m is generated PDCCH DCI information bit, through adding CPC, operations such as CR-RNTI (value is FFF4) scrambling, wherein CCE polymerization grade is the highest polymerization grade that system supports, on minimum logical place, sends.If needed, can repeat this emission process N time.
Step 7: the base station stops at the work of this frequency, and sets up the sub-district according to the running parameters such as frequency of Index m indication in the tabulation.
End side:
Step 1: in 700HMz frequency band search LTE sub-district, reside in the LTE sub-district afterwards behind the starting up of terminal, and receive broadcast, and upgrade subsequent use frequency end side tabulation according to broadcast through PBCH.
Step 2: the terminal is at first detecting on the PDCCH lowest logical position to detect by the highest CCE polymerization grade whether the DCI that carries frequency migration triggering is arranged in the blind check at every turn, and the RNTI that uses is CR-RNTI (value is FFF4), if there is not then operate as normal; If have, then the 15bits DCI that detects is decoded as the 2bits effective information, according to the produce effect Index m of DCI information indication of 2bits, use in the subsequent use frequency end side tabulation Index m corresponding parameters to carry out the frequency migration.
Referring to Fig. 5, the embodiment of the invention also provides a kind of CR wireless communication system, and this system comprises:
Referring to Fig. 6, 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 61 is used for when current working frequency detects the signal of authoring system, sends the information that the frequency migration is carried out at this terminal that triggers through physical downlink control channel PDCCH to the terminal.
Said tabulation transmitting element 60 is used for:
Carry out the frequency spectrum detection analysis, confirm available frequency, deposit the information of the available frequency of confirming in subsequent use frequency tabulation according to frequency spectrum detection analysis result and system requirements;
Available frequency in the subsequent use frequency tabulation is carried out prioritization;
Subsequent use frequency tabulation after the prioritization is sent to the terminal.
Said frequency migration trigger element 61 is used for:
Triggering terminal being carried out the information of frequency migration encodes according to Downlink Control Information DCI form;
The CRC CRC of the DCI that obtains after using cognitive radio Radio Network Temporary Identifier CR-RNTI to coding carries out scrambling, and the DCI after the scrambling is sent to the terminal through PDCCH; Said CR-RNTI is the RNTI that system reserves.
The information that said triggering terminal is carried out the frequency migration takies one or more information bits position.
Said DCI form is: Format 1C form.
Said frequency migration trigger element 61 is used for:
Adopt fixing control channel unit CCE polymerization grade, the DCI after fixing logical place is with scrambling sends to the terminal through PDCCH.
Said CCE polymerization grade is the highest CCE polymerization grade that system supports.
Said logical place is the corresponding lowest logical position of said CCE polymerization grade.
Said frequency migration trigger element 61 is used for:
DCI continuous several times after the scrambling is sent to the terminal through PDCCH.
Referring to Fig. 7, the embodiment of the invention also provides the frequency moving apparatus in a kind of CR wireless communication system, and this device comprises:
List information receiving element 70 is used to receive the subsequent use frequency tabulation that send the base station, comprises the information of the detected available frequency in base station in this subsequent use frequency tabulation;
Said frequency migration units 71 is used for:
Detect the Downlink Control Information DCI that uses cognitive radio Radio Network Temporary Identifier CR-RNTI scrambling at PDCCH; Said CR-RNTI is the RNTI that system reserves;
When detecting said DCI, detected DCI is deciphered, from said subsequent use frequency tabulation, select an available frequency according to the effective information position that decoding obtains, and working frequency points is moved to this available frequency.
Said frequency migration units 71 is used for:
When bit of effective information bit stealing that said decoding obtains, select i available frequency in the said subsequent use frequency tabulation, said i is predefined numerical value; Perhaps,
When a plurality of bit of effective information bit stealing that said decoding obtains, select j available frequency in the said subsequent use frequency tabulation, said j is indicated by said effective information position.
The form that said DCI adopted is: Format 1C form.
Said frequency migration units 71 is used for:
According to fixing control channel unit CCE polymerization grade, detect the DCI that uses the CR-RNTI scrambling at the fixing logical place of PDCCH.
Said CCE polymerization grade is the highest CCE polymerization grade that system supports.
Said logical place is the corresponding lowest logical position of said CCE polymerization grade.
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, subsequent use frequency tabulation is sent to the terminal in the base station, and when current working frequency detects the signal of authoring system, sends the information that the frequency migration is carried out at this terminal that triggers through PDCCH to the terminal.The terminal receives and preserves the subsequent use frequency tabulation that send the base station, and the information of carrying out the frequency migration at this terminal of triggering that the PDCCH base stations detected is sent, and when detecting this information, working frequency points is moved to the available frequency in the said subsequent use frequency tabulation.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 terminal of wireless communication system is carried out the frequency migration.
And; The scheme that the embodiment of the invention provides is sent the information that the frequency migration is carried out at this terminal that triggers through PDCCH to the terminal; Because PDCCH can be according to channel quality selective polymerization grade flexibly; Thereby can better resist the interference of authoring system, can improve the CR terminal of wireless communication system and successfully detect and trigger the information that the frequency migration is carried out at this terminal, and then effectively improve the robustness of notice terminal frequency migration.
To sum up, adopt LTE of the present invention system to disturb down the frequency spectrums of operation of LTE system is transferred on the new available frequency, guaranteed the quick yielding of authoring system and the service outage duration at assurance terminal are met the demands at more intense different system same frequency.The way of this programme goes for other GSM that uses cognitive frequency range work and terminals.
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 (35)
1. the migration of the frequency in cognitive radio CR wireless communication system triggering method is characterized in that this method comprises:
Send subsequent use frequency tabulation to the terminal, comprise the information of the detected available frequency in base station in this subsequent use frequency tabulation;
When current working frequency detects the signal of authoring system, send the information that the frequency migration is carried out at this terminal that triggers to the terminal through physical downlink control channel PDCCH.
2. the method for claim 1 is characterized in that, saidly sends the tabulation of subsequent use frequency to the terminal and comprises:
Carry out the frequency spectrum detection analysis, confirm available frequency, deposit the information of the available frequency of confirming in subsequent use frequency tabulation according to frequency spectrum detection analysis result and system requirements;
Available frequency in the subsequent use frequency tabulation is carried out prioritization;
Subsequent use frequency tabulation after the prioritization is sent to the terminal.
3. according to claim 1 or claim 2 method is characterized in that, the said transmission to the terminal through PDCCH triggered the information of carrying out the frequency migration in this terminal and comprised:
Triggering terminal being carried out the information of frequency migration encodes according to Downlink Control Information DCI form;
The CRC CRC of the DCI that obtains after using cognitive radio Radio Network Temporary Identifier CR-RNTI to coding carries out scrambling, and the DCI after the scrambling is sent to the terminal through PDCCH; Said CR-RNTI is the RNTI that system reserves.
4. method as claimed in claim 3 is characterized in that, the information that said triggering terminal is carried out the frequency migration takies one or more information bits position.
5. method as claimed in claim 3 is characterized in that, said DCI form is: Format 1C form.
6. method as claimed in claim 3 is characterized in that, saidly DCI after the scrambling is sent to the terminal through PDCCH comprises:
Adopt predefined control channel unit CCE polymerization grade, the DCI after predefined logical place is with scrambling sends to the terminal through PDCCH.
7. method as claimed in claim 6 is characterized in that, said CCE polymerization grade is the highest CCE polymerization grade that system supports.
8. method as claimed in claim 6 is characterized in that, said logical place is the corresponding lowest logical position of said CCE polymerization grade.
9. method as claimed in claim 3 is characterized in that, saidly DCI after the scrambling is sent to the terminal through PDCCH comprises:
DCI continuous several times after the scrambling is sent to the terminal through PDCCH.
10. the frequency moving method in the cognitive radio CR wireless communication system is characterized in that this method comprises:
Receive the subsequent use frequency tabulation that send the base station, comprise the information of the detected available frequency in base station in this subsequent use frequency tabulation;
The information of carrying out the frequency migration at this terminal of triggering that the physical downlink control channel PDCCH base stations detected is sent, and when detecting this information, working frequency points is moved to the available frequency in the said subsequent use frequency tabulation.
11. method as claimed in claim 10 is characterized in that, the information of frequency migration is carried out at said this terminal of triggering of sending in the PDCCH base stations detected, and the available frequency of when detecting this information, working frequency points being moved in the said subsequent use frequency tabulation comprises:
Detect the Downlink Control Information DCI that uses cognitive radio Radio Network Temporary Identifier CR-RNTI scrambling at PDCCH; Said CR-RNTI is the RNTI that system reserves;
When detecting said DCI, detected DCI is deciphered, from said subsequent use frequency tabulation, select an available frequency according to the effective information position that decoding obtains, and working frequency points is moved to this available frequency.
12. method as claimed in claim 11 is characterized in that, the said effective information position that obtains according to decoding selects an available frequency to comprise from said subsequent use frequency tabulation:
When bit of effective information bit stealing that said decoding obtains, select i available frequency in the said subsequent use frequency tabulation, said i is predefined numerical value; Perhaps,
When a plurality of bit of effective information bit stealing that said decoding obtains, select j available frequency in the said subsequent use frequency tabulation, said j is indicated by said effective information position.
13. method as claimed in claim 11 is characterized in that, the form that said DCI adopted is: Format 1C form.
14. method as claimed in claim 11 is characterized in that, the said detection at PDCCH uses the DCI of CR-RNTI scrambling to comprise:
According to fixing control channel unit CCE polymerization grade, detect the DCI that uses the CR-RNTI scrambling at the fixing logical place of PDCCH.
15. method as claimed in claim 14 is characterized in that, said CCE polymerization grade is the highest CCE polymerization grade that system supports.
16. method as claimed in claim 14 is characterized in that, said logical place is the corresponding lowest logical position of said CCE polymerization grade.
17. the migration of the frequency in cognitive radio CR wireless communication system trigger equipment is characterized in that this device comprises:
The tabulation transmitting element is used for sending subsequent use frequency tabulation to the terminal, comprises the information of the detected available frequency of device in this subsequent use frequency tabulation;
Frequency migration trigger element is used for when current working frequency detects the signal of authoring system, sends the information that the frequency migration is carried out at this terminal that triggers through physical downlink control channel PDCCH to the terminal.
18. device as claimed in claim 17 is characterized in that, said tabulation transmitting element specifically is used for:
Carry out the frequency spectrum detection analysis, confirm available frequency, deposit the information of the available frequency of confirming in subsequent use frequency tabulation according to frequency spectrum detection analysis result and system requirements;
Available frequency in the subsequent use frequency tabulation is carried out prioritization;
Subsequent use frequency tabulation after the prioritization is sent to the terminal.
19., it is characterized in that said frequency migration trigger element specifically is used for like claim 17 or 18 described devices:
Triggering terminal being carried out the information of frequency migration encodes according to Downlink Control Information DCI form;
The CRC CRC of the DCI that obtains after using cognitive radio Radio Network Temporary Identifier CR-RNTI to coding carries out scrambling, and the DCI after the scrambling is sent to the terminal through PDCCH; Said CR-RNTI is the RNTI that system reserves.
20. device as claimed in claim 19 is characterized in that, the information that said triggering terminal is carried out the frequency migration takies one or more information bits position.
21. device as claimed in claim 19 is characterized in that, said DCI form is: Format 1C form.
22. device as claimed in claim 19 is characterized in that, said frequency migration trigger element specifically is used for:
Adopt fixing control channel unit CCE polymerization grade, the DCI after fixing logical place is with scrambling sends to the terminal through PDCCH.
23. device as claimed in claim 22 is characterized in that, said CCE polymerization grade is the highest CCE polymerization grade that system supports.
24. device as claimed in claim 22 is characterized in that, said logical place is the corresponding lowest logical position of said CCE polymerization grade.
25. device as claimed in claim 19 is characterized in that, said frequency migration triggers single concrete unit and is used for:
DCI continuous several times after the scrambling is sent to the terminal through PDCCH.
26. the frequency moving apparatus in the cognitive radio CR wireless communication system is characterized in that this device comprises:
The list information receiving element is used to receive the subsequent use frequency tabulation that send the base station, comprises the information of the detected available frequency in base station in this subsequent use frequency tabulation;
The frequency migration units is used for carrying out at this terminal of triggering that the physical downlink control channel PDCCH base stations detected is sent the information of frequency migration, and when detecting this information, working frequency points is moved to the available frequency in the said subsequent use frequency tabulation.
27. device as claimed in claim 26 is characterized in that, said frequency migration units specifically is used for:
Detect the Downlink Control Information DCI that uses cognitive radio Radio Network Temporary Identifier CR-RNTI scrambling at PDCCH; Said CR-RNTI is the RNTI that system reserves;
When detecting said DCI, detected DCI is deciphered, from said subsequent use frequency tabulation, select an available frequency according to the effective information position that decoding obtains, and working frequency points is moved to this available frequency.
28. device as claimed in claim 27 is characterized in that, said frequency migration units specifically is used for:
When bit of effective information bit stealing that said decoding obtains, select i available frequency in the said subsequent use frequency tabulation, said i is predefined numerical value; Perhaps,
When a plurality of bit of effective information bit stealing that said decoding obtains, select j available frequency in the said subsequent use frequency tabulation, said j is indicated by said effective information position.
29. device as claimed in claim 27 is characterized in that, the form that said DCI adopted is: Format 1C form.
30. device as claimed in claim 27 is characterized in that, said frequency migration units specifically is used for:
According to fixing control channel unit CCE polymerization grade, detect the DCI that uses the CR-RNTI scrambling at the fixing logical place of PDCCH.
31. device as claimed in claim 30 is characterized in that, said CCE polymerization grade is the highest CCE polymerization grade that system supports.
32. device as claimed in claim 30 is characterized in that, said logical place is the corresponding lowest logical position of said CCE polymerization grade.
33. a cognitive radio CR wireless communication system is characterized in that this system comprises:
The base station is used for sending subsequent use frequency tabulation to the terminal, comprises the information of the detected available frequency in base station in this subsequent use frequency tabulation; When current working frequency detects the signal of authoring system, send the information that the frequency migration is carried out at this terminal that triggers to the terminal through physical downlink control channel PDCCH;
The terminal is used to receive the subsequent use frequency tabulation that send the base station; The information of carrying out the frequency migration at this terminal of triggering that the PDCCH base stations detected is sent, and when detecting this information, working frequency points is moved to the available frequency in the said subsequent use frequency tabulation.
34. a base station is characterized in that, this base station comprises arbitrary described device among the claim 17-25.
35. a terminal is characterized in that, this terminal comprises arbitrary described device among the claim 26-32.
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| CN2010105172237A CN102457929A (en) | 2010-10-15 | 2010-10-15 | Frequency point migration triggering method and equipment, frequency point migration method and system, and equipment |
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| CN2010105172237A CN102457929A (en) | 2010-10-15 | 2010-10-15 | Frequency point migration triggering method and equipment, frequency point migration method and system, and equipment |
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Application publication date: 20120516 |