CN101815311A - Link establishment method by taking user as center in cognitive radio scene - Google Patents
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Abstract
The invention discloses a link establishment method by taking a user as a center in a cognitive radio scene, and belongs to the technical field of wireless communication. In a system taking the user as the center, the user can freely select a seller having available channels, so call blocking can be generated unless all sellers are overloaded. Therefore, the call blocking rate is reduced, and the spectral efficiency is improved. The method comprises three steps of initial spectrum environment sensing, optimal seller locking, and stabilization of transceiving spectral masks. In the initial spectrum environment sensing, an MS scans BS beacons, a seller of which the link quality meets the requirement is selected, a request is sent, and a seller model and a related loss function are established; in the optimal seller locking, the optimal seller is selected in the established model basin, the MS sends a locking request to an MRC, the MRC sends locking information to the selected seller, and an initial link is established between the MS and the seller BS; and in the stabilization of transceiving spectral masks, the difference between the transceiving spectral masks is reduced by exchanging spectrum detecting results between the MS and the BS, a stable link is established, and the BS provides communication service for the MS in the update time T. The invention introduces the thought of taking the user as the center, and can effectively reduce the call blocking rate and improve the spectral efficiency.
Description
Technical field
The present invention relates to the method for link establishment in a kind of wireless system of customer-centric in the cognitive radio scene, belong to wireless communication technology field, be particularly related to cognitive radio technology (Cognitive Radio, CR, S.Haykin, " CognitiveRadio:Brain-Empowered Wireless Communications; " IEEE JSAC, Feb.2005, vol.23, no2, pp.201-220).
Background technology
The CR technology has become a kind of one of the most attractive technology that improves the frequency spectrum service efficiency.The research that improves wireless system performance based on the CR technology has also obtained a lot of progress.In the middle of traditional wireless communication system, employing all be to be the system at center with the seller, promptly the user obeys service provider (seller), and the frequency spectrum that always is to use the seller to distribute, and sets up link and communicates.The system utility performance (being defined as spectrum efficiency, blocking rate) that with the seller is the center is lower.
At this problem, some preliminary results of study have been arranged.Part Study person has proposed a kind of wireless system setting of customer-centric.In the system of customer center, the user no matter at any time, the service that can both freely select the best seller to provide of any position.Intelligent mobile station is selected the best seller by certain rule.But, this article does not provide method for building up (the Zekavat S A of initial link circuit in the CR scene, Li X. " User-central wireless system:ultimatedynamic channel allocation; " in:proc.IEEE DySPAN 2005, November, 2005, pp.82-87).And when setting up link based on the signalling exchange system of OFDM, when the sending and receiving end frequency spectrum detecting result is inconsistent, can cause serious disturbance (T.Weiss more to authorized user (Incumbent Users), J.Hillenbrand, A.Krohn, F.K.Jondral, " Efficient Signaling of Spectral Resources in Spectrum Pooling Systems, " Proc.Of the 10
ThSymposium on Communications and Vehicular Technology SCVT 2003, Eindhoven, Netherlands, 2003).Other researcher distributes special-purpose logic channel for signaling control channel, and (Ultra-Wide Band, UWB) technology is as a kind of signaling transmission mechanism with ultra broadband.In order to solve the usable spectrum that constantly changes in the CR scene, there are some researchers to propose a kind of link maintenance mechanism, but, they do not set forth (D.Willkomm to concrete technology, J.Gross, and A.Wolisz, " Reliable Link Maintenance in CognitiveRadio Systems; " In Proc.Of the IEEE Symposium on New Frontiers in Dynamic SpectrumAccess Networks (DySPAN 2005), Baltimore (MD), November 2005).
Existing method (based on the method for boosting agreement and OFDM):
Suppose access point (Access Point, AP) broadcasted pressure frequency spectrum resource allocation vector give all travelling carriages (MobileStation, MS).This method only considers that the situation that the channel authorization user inserts and original authorized user withdraws from is arranged.
Phase I: collect the testing result stage.
The first step: each travelling carriage is compared the allocation vector of broadcasting after new detected result and the last sense cycle after finishing input.If have in the new authorized user access network, the travelling carriage transmitting power with maximum on the subcarrier that the new user of access inserts that detects new authorized user access is so launched the complex value symbol, such as 1+j1, does not transmit on other subcarrier.
Second step: amplified because the signal of the new authorized user that inserts is detected the travelling carriage of its signal, access point apparatus detects the frequency spectrum that the authorized user of new access takies at an easy rate.
The 3rd step: old distributed carry and idle subband between do mapping one by one, travelling carriage transmits with maximum transmission power on the idle subband of correspondence allocated subbands, does not transmit on the idle subband of the subband correspondence of the authorized user correspondence that exits network.
The 4th step: access point is known old subband that has distributed and the mapping relations one by one between the idle subband in advance, so it can detect withdrawing from of authorized user.
Second stage: broadcast allocation vector.
The first step: access point apparatus is divided into plurality of sections with allocation vector, and (CyclicRedundancy Checksum CRC) is combined into separately transmission of bag to each section behind the coding with cyclic redundancy check (CRC).Each wraps in and periodically repeats transmission (repeating at least 3 times) on the idle OFDM subcarrier.
Second step: travelling carriage receives the bag of access point broadcasting on the OFDM of free time subcarrier, obtain new spectrum allocation may vector.
The shortcoming of this method:
1, based on the signaling transmission mechanism of OFDM, frequency spectrum detecting result is inconsistent in the sending and receiving end, particularly when having the new authorized user that uses a large amount of subbands to insert, can cause unnecessary interference to authorized user.
2, only consider link maintenance mechanism between access point and the travelling carriage, do not considered the mechanism when travelling carriage initially inserts.
3, based on the system at seller center, frequency spectrum is not fully utilized, and blocking rate is high slightly.
Summary of the invention
In traditional wireless communication system, all be to be the center with the seller, cause the availability of frequency spectrum insufficient, and because the difference of link transmit-receive two ends electromagnetic environment of living in, cause the available radio spectrum of sending and receiving end also not quite identical, thereby cause the availability of frequency spectrum not high, the problem that phase mutual interference and link-quality descend between the user.In order to solve the problems of the technologies described above, the present invention proposes the link establishing method of customer-centric in a kind of cognitive radio scene.
Technical solution of the present invention is:
The link establishing method of customer-centric in a kind of cognitive radio scene, precondition is in the hypothesis CR network, there is some BS (base station, Base Station) and some MS (travelling carriages, Mobile Station), the frequency spectrum detecting result of BS and MS can reflect the usable spectrum distribution situation of BS and MS end truly, reliably.Each BS has the specific seller to provide, and the seller has formed the seller's Local Area Network by mobile registration center (MRC) control between a seller.MS does not need predetermined any seller, as long as be registered to the validated user that MRC just becomes wireless network.Its process comprises the steps:
Step 1: spectrum environment sensing
In the wireless system of customer center, after the MS start, search seller pilot transmitted signal is differentiated the seller's BS, the data assessment initial link circuit quality of utilizing demodulation to obtain.If link-quality more than or equal to threshold T 1, think so link can with and MS send request and make the seller notify its base station.BS sends self information to the MS of request.MS receives after the response of seller BS, for it sets up the loss function.Then, MS continues the perception environment, and receives available channel, produces the related loss function.
Step 2: optimal seller locking
In the spectrum environment sensing of completing steps one, set up relevant model basin after.MS selects the best seller based on the loss function of the best.Then, the best seller of Subscriber Locked, the best is sold direction MRC and is sent locking information.The BS of MS and locking sets up initial link circuit.
Step 3: stablize the transceiving spectral cover
After the best seller of locking, set up an available link between MS and the BS, but the transceiving spectral cover between MS and the BS is still variant.Exchange the difference that reduces between its transceiving spectral cover by frequency spectrum detecting result between MS and the BS.
In whole link use, with period T 0 repeating step one, step 2 and step 3 so that link is safeguarded.
Beneficial effect of the present invention:
1, reduced call blocking rate.Different with seller's centring system, in the customer center system, user's call blocking rate obviously reduces, because the user can freely select the seller of available channel, has only all sellers all just to understand bid during overburden like this and blocks.
2, spectrum efficiency improves.Compare with seller's centring system, there is higher spectrum efficiency in the customer center system, because its call blocking rate is lower; Can insert more calling like this, thereby improve the availability of frequency spectrum.
3, the consistent link that has proposed complete customer-centric is set up and maintaining method, does not need special-purpose control channel.
Description of drawings
Fig. 1 is customer center wireless system arrangements figure;
Fig. 2 is the travelling carriage perception;
Fig. 3 is that MS sets up the link process flow diagram;
Fig. 4 stablizes the spectrum mask flow chart.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Step 1: spectrum environment sensing
In the wireless system of customer center, after the MS start, search seller pilot transmitted signal is differentiated the seller's BS, the data assessment initial link circuit quality of utilizing demodulation to obtain.(threshold T 1 can be signal to noise ratio if link-quality is more than or equal to threshold T 1, can be signal power, its span depends on concrete application scenarios, comprise communication channel condition, the launch scenario that is adopted and type of service etc.), think so link can with and MS send request and make the seller notify its base station.BS sends self information to the MS of request.MS receives after the response of each seller BS, for it sets up the loss function.Then, MS continues the perception environment, and receives available channel, produces the related loss function.
Step 2: optimal seller locking
In the spectrum environment sensing of completing steps one, set up relevant model basin after.MS selects the best seller based on the loss function of the best.Then, the best seller of Subscriber Locked, the best is sold direction MRC and is sent locking information.The BS of MS and locking sets up initial link circuit.
Step 3: stablize the transceiving spectral cover
After the best seller of locking, set up an available link between MS and the BS, but the transceiving spectral cover between MS and the BS is still variant.Exchange the difference that reduces between its transceiving spectral cover by frequency spectrum detecting result between MS and the BS, as shown in Figure 4, specifically comprise the steps:
The first step: MS launches its frequency spectrum detecting result by its transceiving spectral cover.
Second step: the BS receives the signal that MS launches by its received spectrum cover, and estimates MS end available spectrum resource by the signal that receives; The result that the BS estimation obtains and the common factor of its local testing result are as BS new emission spectrum cover and received spectrum cover; The frequency spectrum detecting result of BS reality is launched by new emission spectrum cover.
The 3rd step: MS receives the signal of BS emission by its received spectrum cover, and estimates the usable spectrum resource of BS end by the signal that receives; The result that the MS estimation obtains and the common factor of its local testing result are as new emission spectrum cover and the received spectrum cover of MS; The frequency spectrum detecting result of MS reality is launched by new emission spectrum cover.
The 4th step: after repeatedly exchanging between MS and the BS, if the transceiving spectral of BS covers on continuous variation, constantly exchange frequency spectrum detecting result so between MS and the BS, reach the number of times M (M depends on professional requirement to time delay in the different application scene) that maximum can allow up to the exchange number of times.After the exchange number of times surpasses M, if the transceiving spectral cover of BS is abandoned this link so still changing; If the transceiving spectral cover of the transceiving spectral cover of BS and MS is compared difference and is less than or equal to threshold T 2 (threshold T 2 can be the mistake number, its span depends on concrete application scenarios, comprise communication channel condition, the launch scenario that is adopted and type of service etc.), stop exchange so, finish link establishment, carry out transfer of data.
In whole link use, with period T 0 repeating step one, step 2 and step 3 so that link is safeguarded.Above embodiment is the unrestricted technical scheme involved in the present invention in order to explanation only, although the present invention is had been described in detail with reference to above preferred embodiment, those of ordinary skill in the art should be appreciated that technical scheme of the present invention can make amendment, is out of shape or is equal to replacement; And do not break away from the spirit and scope of technical solution of the present invention, all should be encompassed among the claim scope of the present invention.
Claims (5)
1. the link establishing method of customer-centric in the cognitive radio scene, precondition is in the hypothesis CR network, the frequency spectrum detecting result of BS and MS can be reacted the usable spectrum distribution situation of BS and MS end truly, reliably, and the MS registration in advance becomes the validated user of wireless network in the MRC; It is characterized in that may further comprise the steps:
Step 1: spectrum environment sensing
In the wireless system of customer center, scanning frequency spectrum after the MS start, search seller pilot transmitted signal is differentiated the seller's BS, the data assessment initial link circuit quality of utilizing demodulation to obtain; If link-quality more than or equal to threshold T 1, think so link can with and MS send request and make the seller notify its base station BS; BS sends self information to the MS of request; MS receives after each seller's the response of BS, for it sets up the loss function; Then, MS continues the perception environment, and receives available channel, produces the related loss function;
Step 2: optimal seller locking
MS selects the best seller based on the loss function of the best; Then, the best seller of Subscriber Locked, the best is sold direction MRC and is sent locking information; The MS and the locking seller's BS sets up initial link circuit;
Step 3: stablize the transceiving spectral cover
After the best seller of locking, set up an available link between MS and the BS, but the transceiving spectral cover between MS and the BS is still variant; Exchange the difference that reduces between its transceiving spectral cover by frequency spectrum detecting result between MS and the BS, specifically comprise the steps:
The first step: MS launches the frequency spectrum detecting result of MS by its transceiving spectral cover;
Second step: the BS receives the signal that MS launches by its received spectrum cover, and estimates MS end available spectrum resource by the signal that receives; The result that the BS estimation obtains and the common factor of its local testing result are as BS new emission spectrum cover and received spectrum cover; The frequency spectrum detecting result of BS reality is launched by new emission spectrum cover
The 3rd step: MS receives the signal of BS emission by its received spectrum cover, and estimates the usable spectrum resource of BS end by the signal that receives; The result that the MS estimation obtains and the common factor of its local testing result are as new emission spectrum cover and the received spectrum cover of MS; The frequency spectrum detecting result of MS reality is launched by new emission spectrum cover;
The 4th step: after repeatedly exchanging between MS and the BS,, constantly exchange frequency spectrum detecting result so between MS and the BS, reach the number of times M that maximum can allow up to the exchange number of times if the transceiving spectral of BS covers on continuous variation; After the exchange number of times surpasses M, if the transceiving spectral cover of BS is abandoned this link so still changing; If the spectrum mask difference of the transceiving spectral cover of BS and MS is less than or equal to threshold T 2, stop exchange so, finish link establishment, carry out transfer of data.
2. the link establishing method of customer-centric is characterized in that in a kind of cognitive radio scene according to claim 1, in whole link use, with fixing period T 0 repeating step one, step 2 and step 3 so that link is safeguarded.
3. the link establishing method of customer-centric in a kind of cognitive radio scene according to claim 1, it is characterized in that, threshold T 1 can be signal to noise ratio or signal power, its span depends on concrete application scenarios, and described concrete application scenarios comprises communication channel condition, the launch scenario that is adopted and type of service.
4. the link establishing method of customer-centric is characterized in that in a kind of cognitive radio scene according to claim 1, and BS sends self information to the MS of request and comprises and be not limited to channel availability, congestion ratio, BER, signal power.
5. the link establishing method of customer-centric in a kind of cognitive radio scene according to claim 1, it is characterized in that, described threshold T 2 is the mistake number, its span depends on concrete application scenarios, and described concrete application scenarios comprises communication channel condition, the launch scenario that is adopted and type of service.
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| CN104202777A (en) * | 2014-09-16 | 2014-12-10 | 北京邮电大学 | Augmented Lagrangian-based resource consultation mechanism in MANETs (mobile ad hoc networks) |
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| CN1829385A (en) * | 2006-04-13 | 2006-09-06 | 电子科技大学 | Chain circuit building method in cognitive radio field |
| CN101325461A (en) * | 2008-07-25 | 2008-12-17 | 浙江大学 | Method for establishing and maintaining cognition radio communication link based on non-speed code |
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| CN1829385A (en) * | 2006-04-13 | 2006-09-06 | 电子科技大学 | Chain circuit building method in cognitive radio field |
| CN101325461A (en) * | 2008-07-25 | 2008-12-17 | 浙江大学 | Method for establishing and maintaining cognition radio communication link based on non-speed code |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104202777A (en) * | 2014-09-16 | 2014-12-10 | 北京邮电大学 | Augmented Lagrangian-based resource consultation mechanism in MANETs (mobile ad hoc networks) |
| CN104202777B (en) * | 2014-09-16 | 2019-07-26 | 北京邮电大学 | Resource negotiation method based on augmentation Lagrange in mobile ad hoc network |
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Application publication date: 20100825 |