CN103595518A - Method for building frequency spectrum pool database based on unshared base station - Google Patents
Method for building frequency spectrum pool database based on unshared base station Download PDFInfo
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- CN103595518A CN103595518A CN201310576528.9A CN201310576528A CN103595518A CN 103595518 A CN103595518 A CN 103595518A CN 201310576528 A CN201310576528 A CN 201310576528A CN 103595518 A CN103595518 A CN 103595518A
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Abstract
The invention discloses a method for building a frequency spectrum pool database based on an unshared base station, particularly relates to a method which is applied to a cellular network of the base station unshared between secondary user systems and master user systems, and is used for replacing the radio frequency spectrum sensing technology, and relates to the technical field of cognitive radio frequency spectrum sensing. According to the method for building the frequency spectrum pool database based on the unshared base station, an orthogonal subcarrier modulated through the OFDM serves as an object, the frequency spectrum pool database is built in the base station of the cellular network of each master user system, and the secondary user systems have the cognitive user access control function and the frequency spectrum distribution function, and obtain idle subcarriers of the master user systems through master user system broadcast messages. Therefore, the method for building the frequency spectrum pool database based on the unshared base station has the advantage that the time for obtaining the idle frequency spectrum is shortened. The method for building the frequency spectrum pool database based on the unshared base station is based on the cellular network, such as a future LTE system. When the method for building the frequency spectrum pool database based on the unshared base station is used, it is made possible that the secondary user systems can use resources of the LTE system.
Description
Technical field
The present invention relates to cognitive radio frequency spectrum cognition technology field, more particularly, be that a kind of primary user's of being applied to system is the environment of Cellular Networks structure and cognitive user system and the unshared base station of primary user's system, can substitute the method for cognitive radio frequency spectrum cognition technology.
Background technology
Along with the growth of radio communication service, available frequency band day is becoming tight, and the problem of frequency spectrum resource scarcity is day by day serious.How to improve the availability of frequency spectrum, in zones of different and different time sections, effectively utilize different idle channels, become the technical problem that people pay special attention to.Cognitive radio (CR) Objective Concept Joseph doctor Mitola proposes, and its dominant ideas are by perception primary user's quickly and accurately idle frequency spectrum and are used, to improve the availability of frequency spectrum.Therefore the autoepistemic radio concept of frequency spectrum perception technology since proposing always as the important component part of cognitive radio technology.On in September, 2011 < < electronics fan > >, relevant for frequency spectrum perception technology summary, the Data Base Pile technology proposing, because the database of this technology is based upon in cognitive user system, it needs real-time detection, upgrade primary user's positional information, need to set up the network of a database for this reason, thus the increase that brings cost.The < < frequency spectrum sensing method being proposed by Huawei Tech Co., Ltd of another publication number CN102611509A, frequency spectrum perception equipment and database > >, remain the frequency spectrum perception level based on technology signal detection technique, the storage of database that it proposes to as if various frequency spectrum perception algorithms, the method needs frequent target perception frequency point information and the corresponding target aware software sign of transmitting simultaneously, allow in fact workflow become more loaded down with trivial details, in time, on cost, its technology to realize difficulty all larger.Along with about the deepening continuously of frequency spectrum perception technology correlative study, the problem main manifestations that frequency spectrum perception technology exposes is two aspects: being the accuracy problem of frequency spectrum perception on the one hand, is the speed issue of frequency spectrum perception on the other hand.And the solution of these two problems exists certain contradiction, or solve by increasing complexity and the cost of equipment, yet even if can not guarantee the detection of frequency spectrum cavity-pocket so perfectly safely, still exist certain false dismissal probability.
Summary of the invention
The object of the invention is to the disappearance and the deficiency that for existing frequency spectrum perception technology, exist, a kind of method of alternative frequency spectrum perception technology is proposed, it is a kind of method of setting up spectrum pool database based on unshared base station, be characterized in comprising, spectrum pool Database is in primary user's system base-station of each cellular network cell, and cognitive user access control and spectrum allocation may function are responsible for by cognitive user system.
Wherein, described primary user's system is usingd the orthogonal sub-carriers of OFDM (OFDM) modulation as object, and the sign that the orthogonal sub-carriers of usining is distinguished as multiple access is usingd the basic element of orthogonal sub-carriers as spectrum pool database.
Described " time that OFDM modulation once used " meaning " OFDM symbol period ".
A kind of described method of setting up spectrum pool database based on unshared base station, its feature is, comprises step in described OFDM symbol period:
A.1. refresh spectrum pool database;
A.2. count the idle sub-carrier number in current OFDM symbol period;
A.3. suppose that the whole orthogonal sub-carriers number of each OFDM symbol period is M, the number that orthogonal sub-carriers is taken by primary user is N, in each OFDM symbol period, the number of idle sub-carrier is M-N, if M-N>0 enters step B, otherwise skips to step C.
B. primary user's system base-station is to the idle sub-carrier in the current OFDM symbol period of place Cell Broadcast CB, and primary user's system base-station no longer participates in spectrum allocation may.
C. current OFDM symbol period finishes, and returns to steps A .1.
The present invention compares with a kind of method of setting up spectrum pool database based on sharing base, cognitive user access control and spectrum allocation may function are responsible for by cognitive user system, primary user's system is only broadcasted idle frequency spectrum information, cause cognitive user system not there is the ability of obtaining primary user idle frequency spectrum equal with primary user's system, but this has reduced, realize cost, realize simpler.
Accompanying drawing explanation
Fig. 1 is a kind of FB(flow block) of setting up the embodiment of the method for spectrum pool database based on unshared base station of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described
Refer to a kind of method of setting up spectrum pool database based on unshared base station shown in accompanying drawing 1, the method comprises the following steps:
Based on unshared base station, set up a method for spectrum pool database, its feature is, spectrum pool Database is in primary user's system base-station of each cellular network cell, and cognitive user access control and spectrum allocation may function are responsible for by cognitive user system.
Described primary user's system is usingd the orthogonal sub-carriers of OFDM modulation as object, and the sign that the orthogonal sub-carriers of usining is distinguished as multiple access is usingd the basic element of orthogonal sub-carriers as spectrum pool database.
Based on unshared base station, set up a method for spectrum pool database, its feature is, comprises step in described OFDM symbol period:
A.1. refresh spectrum pool database;
A.2. count the idle sub-carrier in current OFDM symbol period;
A.3. suppose that the whole orthogonal sub-carriers number of each OFDM symbol period is M, orthogonal sub-carriers is taken number N by primary user, in each OFDM symbol period, the number of idle sub-carrier is M-N, if M-N>0 enters step B, otherwise skips to step C.
B. primary user's system base-station is to the idle sub-carrier in the current OFDM symbol period of place Cell Broadcast CB, and primary user's system base-station no longer participates in spectrum allocation may.
C. current OFDM symbol period finishes, and returns to steps A .1.
In sum, the method that the present invention under certain conditions proposes has shortened the process of cognitive radio technology application, without the problems such as false dismissal probability nonzero sum real-time deficiency in common frequency spectrum perception algorithm.In addition, because the present invention is based on cellular network, so the present invention can be applied in the mobile communications network of operator, as following LTE system.Use this method to allow cognitive radio system use the resource of LTE system to become possibility.Again owing to being a kind of method of setting up spectrum pool database based on unshared base station, therefore the present invention compares with a kind of method of setting up spectrum pool database based on sharing base, cognitive user access control and spectrum allocation may function are responsible for by cognitive user system, primary user's system is only broadcasted idle frequency spectrum information, cause cognitive user system not there is the ability of obtaining primary user idle frequency spectrum equal with primary user's system, but this has reduced, realize cost, realize simpler.
Claims (3)
1. a method of setting up spectrum pool database based on unshared base station, it is characterized in that, in the base station of spectrum pool Database under primary user's system, primary user's system and cognitive user system are not enjoyed base station jointly, and cognitive user access control and spectrum allocation may function are responsible for by cognitive user system.
2. a kind of method of setting up spectrum pool database based on unshared base station as claimed in claim 1, it is characterized in that, described primary user's system is usingd the orthogonal sub-carriers of OFDM modulation as object, the sign that the orthogonal sub-carriers of usining is distinguished as multiple access, usings the basic element of orthogonal sub-carriers as spectrum pool database.
3. a kind of method of setting up spectrum pool database based on unshared base station as claimed in claim 2, is characterized in that, comprises step in described OFDM symbol period:
A.1. refresh spectrum pool database;
A.2. count the idle sub-carrier number in current OFDM symbol period;
A.3. suppose that the whole orthogonal sub-carriers number of each OFDM symbol period is M, the number that orthogonal sub-carriers is taken by primary user is N, in each OFDM symbol period, the number of idle sub-carrier is M-N, if M-N>0 enters step B, otherwise skips to step C;
B. primary user's system base-station is to the idle sub-carrier in the current OFDM symbol period of place Cell Broadcast CB, and primary user's system base-station no longer participates in spectrum allocation may;
C. current OFDM symbol period finishes, and returns to steps A .1.
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Citations (5)
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| CN201947445U (en) * | 2011-02-14 | 2011-08-24 | 国家无线电频谱管理研究所 | Dynamic spectrum allocation system based on time particle size |
| CN102209364A (en) * | 2011-05-20 | 2011-10-05 | 北京邮电大学 | Multi-user admission control method and system in cognitive radio communication system |
| CN102223652A (en) * | 2011-06-10 | 2011-10-19 | 北京邮电大学 | Wireless access system and method based on combination of cognitive database and spectrum detection |
| CN102316594A (en) * | 2011-09-23 | 2012-01-11 | 北京邮电大学 | Method for cross layer resource distribution and grouped dispatch in cognitive wireless network |
| CN102833759A (en) * | 2012-08-15 | 2012-12-19 | 北京工业大学 | Cognitive radio spectrum allocation method enabling OFDM (orthogonal frequency division multiplexing) master user to realize maximum revenue |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201947445U (en) * | 2011-02-14 | 2011-08-24 | 国家无线电频谱管理研究所 | Dynamic spectrum allocation system based on time particle size |
| CN102209364A (en) * | 2011-05-20 | 2011-10-05 | 北京邮电大学 | Multi-user admission control method and system in cognitive radio communication system |
| CN102223652A (en) * | 2011-06-10 | 2011-10-19 | 北京邮电大学 | Wireless access system and method based on combination of cognitive database and spectrum detection |
| CN102316594A (en) * | 2011-09-23 | 2012-01-11 | 北京邮电大学 | Method for cross layer resource distribution and grouped dispatch in cognitive wireless network |
| CN102833759A (en) * | 2012-08-15 | 2012-12-19 | 北京工业大学 | Cognitive radio spectrum allocation method enabling OFDM (orthogonal frequency division multiplexing) master user to realize maximum revenue |
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Application publication date: 20140219 |