CN101990231B - Method, system, central node and sensing node for determining idle frequency band - Google Patents
Method, system, central node and sensing node for determining idle frequency band Download PDFInfo
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- CN101990231B CN101990231B CN200910090226.4A CN200910090226A CN101990231B CN 101990231 B CN101990231 B CN 101990231B CN 200910090226 A CN200910090226 A CN 200910090226A CN 101990231 B CN101990231 B CN 101990231B
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Abstract
The embodiment of the invention discloses a method, a system, a central node and a sensing node for determining an idle frequency band. The method for determining the idle frequency band comprises the following steps of: sensing a to-be-detected frequency band at a special sensing time slot and determining a candidate frequency band according to a sensing result of the special sensing time slot; transmitting a sensing and scheduling instruction to the sensing node and scheduling the sensing node to sense the candidate frequency band at a common sensing time slot; and receiving the sensing result reported by the sensing node and determining the idle frequency band according to the sensing result reported by the sensing node. Through the embodiment of the invention, signaling expenditure of the central node and the sensing node in a multi-point cooperative frequency spectrum sensing mode is reduced, and the total power consumption of the sensing node is reduced.
Description
Technical field
The embodiment of the present invention relates to communication technical field, particularly a kind of method and system of definite idle frequency range, Centroid and sensing node.
Background technology
Cognitive radio (Cognitive Radio; Hereinafter to be referred as: CR) technology is one of the most promising technology solving current frequency spectrum resource anxiety, cognitive radio technology is by cognitive radio spectrum environment, can find the frequency range of fully not used in the frequency spectrum of fixed allocation, and at interfere with primary users (Primary User not; Hereinafter to be referred as: these frequency ranges of dynamic access under prerequisite PU), thus improve the availability of frequency spectrum.
Frequency spectrum perception is the key technology of cognitive radio, the object of frequency spectrum perception is the active situation that monitors and detect primary user's signal in special frequency channel, when primary user's signal do not detected in this special frequency channel, when this special frequency channel is idle, cognitive radio system can be used this special frequency channel; When primary user's signal again being detected in this special frequency channel, cognitive radio system must exit this special frequency channel in official hour.Frequency spectrum perception plays an important role in cognitive radio system, and by frequency spectrum perception, cognitive radio system can avoid interference primary user, and improves the availability of frequency spectrum.
Frequency spectrum perception comprises single node frequency spectrum perception and multi-node collaborative frequency spectrum perception.At Institute of Electrical and Electronics Engineers (Institute for Electrical and Electronic Engineers; Hereinafter to be referred as: IEEE) in 802.22, multi-node collaborative frequency spectrum perception is divided into (in-band) perception two classes in outer (out-of-band) perception of band and band.Wherein, being with outer frequency range is still untapped frequency ranges of current 802.22 systems, and these frequency ranges are by base station (Base Station; Hereinafter to be referred as: BS) dispatch idle ustomer premises access equipment (Customer PremiseEquipment; Hereinafter to be referred as: CPE) carry out perception, i.e. the outer perception of band.And in band frequency range be the frequency range used of current 802.22 systems and with the frequency range of the adjacent frequency bands using, for fear of frequency spectrum perception is produced and disturbed, when being with interior perception, be operated in the equipment in in-band frequency range, comprise BS and CPE, all need to keep mourning in silence.
For perception in band, what prior art adopted is a kind of perception mechanism of two-stage, and its quiet period is divided in frame two kinds of perception quiet period and interframe perception quiet period.
In frame, perception quiet period is arranged on the end of each frame, in order to guarantee service quality (the Qualityof Service of business; Hereinafter to be referred as: QoS), in frame, the common duration of perception quiet period is shorter.Perception quiet period in frame, the CPE that BS need dispatch some carries out perception, and this BS also participates in perception simultaneously.In frame, perception can adopt the perception algorithm of speed, and does not require sensing results entirely accurate, i.e. thick perception.After perception finishes, CPE reports sensing results, and candidate's frequency range that BS picks out some according to all sensing results offers the interframe perception of next stage.
The time that interframe perception quiet period can continue more to grow, in interframe perception quiet period, the CPE that BS dispatches some equally carries out perception to candidate's frequency range, and this BS also participates in perception simultaneously.After interframe perception finishes, the CPE of all participation perception reports sensing results to BS, and BS merges all sensing results, draws final court verdict.Different from perception in frame, because interframe perception meeting draws final court verdict, so interframe perception has higher requirements to perceptual sensitivity, and interframe perception should adopt meticulousr perception algorithm, i.e. thin perception, to guarantee the accuracy of sensing results.
In realizing process of the present invention, inventor finds that prior art at least exists following problem: in existing frequency spectrum perception mode, in frame, perception and interframe perception all need BS and CPE to participate in, so the signaling consumption of BS and CPE is larger; And CPE need to participate in perception and this two-stage perception of interframe perception in frame, the overall power consumption expense of CPE is larger, and when CPE is handheld device, larger power consumption expense produces larger impact by the normal use on CPE.
Summary of the invention
The embodiment of the present invention provides a kind of method and system, Centroid and sensing node of definite idle frequency range, to realize the signaling consumption that reduces in multi-point cooperative frequency spectrum perception mode and the power consumption expense of ustomer premises access equipment.
The embodiment of the present invention provides a kind of method of definite idle frequency range, comprising:
At dedicated sense time slot, frequency range to be detected is carried out to perception, according to the sensing results of described dedicated sense time slot, determine candidate's frequency range;
To sensing node, send perception scheduling indication, dispatch described sensing node, at public perception time slot, described candidate's frequency range is carried out to perception;
Receive the sensing results that described sensing node reports, the sensing results reporting according to described sensing node is determined idle frequency range.
The embodiment of the present invention also provides a kind of Centroid, comprising:
Broadband sensing module, at dedicated sense time slot, carries out perception to frequency range to be detected;
Candidate's frequency range determination module, for determining candidate's frequency range according to the sensing results of described broadband sensing module;
Indication sending module, for send perception scheduling indication to sensing node, dispatches described sensing node, at public perception time slot, the definite candidate's frequency range of described candidate's frequency range determination module is carried out to perception;
Sensing results receiver module, the sensing results reporting for receiving described sensing node;
Idle frequency range determination module, determines idle frequency range for the sensing results receiving according to described sensing results receiver module.
The embodiment of the present invention also provides a kind of sensing node, comprising:
Receiver module, the perception sending for receiving center node scheduling indication, described perception scheduling indication is used to indicate described sensing node, at public perception time slot, candidate's frequency range is carried out to perception;
Sensing module, for the perception scheduling indication receiving according to described receiver module, carries out perception to described candidate's frequency range;
Reporting module, for after described public perception time slot finishes, reports the sensing results of described sensing module to described Centroid.
The embodiment of the present invention also provides a kind of system of definite idle frequency range, comprises above-mentioned Centroid and at least one said sensed node.
By the embodiment of the present invention, at dedicated sense time slot, only Centroid carries out perception to frequency range to be detected, therefore without signaling consumption; And the sensing results of utilizing dedicated sense time slot is determined candidate's frequency range, the possibility that to have improved candidate's frequency range be idle frequency range, therefore the frequency range that needs sensing node to carry out perception reduces, and has not only reduced the overall power consumption of sensing node, has also further reduced signaling consumption.Therefore, the embodiment of the present invention has realized the Centroid that reduces in multi-point cooperative frequency spectrum perception mode and the signaling consumption of sensing node, has reduced the overall power consumption of sensing node.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart that the present invention determines an embodiment of method of idle frequency range;
Fig. 2 is the schematic diagram of a perception cycle of the present invention embodiment;
Fig. 3 is the flow chart that the present invention determines another embodiment of method of idle frequency range;
Fig. 4 is the flow chart that the present invention determines another embodiment of method of idle frequency range;
Fig. 5 is the schematic diagram of an embodiment of quiet period setting position of the present invention;
Fig. 6 is the structural representation of an embodiment of Centroid of the present invention;
Fig. 7 is the structural representation of another embodiment of Centroid of the present invention;
Fig. 8 is the structural representation of an embodiment of sensing node of the present invention;
Fig. 9 is the structural representation that the present invention determines an embodiment of system of idle frequency range.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, belongs to the scope of protection of the invention.
The embodiment of the present invention provides a kind of method of definite idle frequency range, and Fig. 1 is the flow chart that the present invention determines an embodiment of method of idle frequency range, and this embodiment introduces the handling process of Centroid side, and as shown in Figure 1, this embodiment comprises:
In the present embodiment, a complete perception cycle is divided into at least one dedicated sense time slot and at least one public perception time slot.Fig. 2 is the schematic diagram of a perception cycle of the present invention embodiment, in Fig. 2, dedicated sense time slot is identical with the quantity of public perception time slot, but the embodiment of the present invention is not limited in this, when practical application, the quantity of flexible configuration dedicated sense time slot and public perception time slot according to actual needs.
Particularly, according to the sensing results of dedicated sense time slot, determine that candidate's frequency range can be: according to the sensing results of dedicated sense time slot, determine occupied frequency range, and determine the priority that remains frequency range in frequency range to be detected after the occupied frequency range of eliminating; According to priority, residue frequency range is sorted, and in the residue frequency range after sequence, select the frequency range of some as candidate's frequency range.For instance, suppose at dedicated sense time slot, Centroid adopts energy measuring mode, and the reflection of the sensing results of dedicated sense time slot is the watt level measuring in frequency range to be detected; If the power of part frequency range to be detected is greater than predefined thresholding, can determine that these frequency ranges are occupied, by its eliminating.The measurement power that remains afterwards frequency range due to the occupied frequency range of eliminating in frequency range to be detected is less, the occupied probability of this residue frequency range is lower, the probability that this residue frequency range is idle frequency range is larger, therefore can determine according to the measurement performance number of residue frequency range the priority of residue frequency range, the measurement performance number of residue frequency range is less, and priority is higher.Then according to this priority, residue frequency range is sorted, after sequence, can be according to the priority of current bandwidth demand and residue frequency range, according to priority order from high to low, in residue frequency range after sequence, select the frequency range of some as candidate's frequency range, for example, select the frequency range that is less than predefined threshold value number as candidate's frequency range.
(1) distribute to frequency location and the bandwidth of candidate's frequency range of its detection of needs of sensing node;
(2) the perception duration;
(3) type of perceived signal;
(4) requirement to perceptual performance.
In the present embodiment, at dedicated sense time slot, only Centroid carries out perception to frequency range to be detected, therefore without signaling consumption; And at public perception time slot, owing to having got rid of the occupied frequency range of part, so signaling consumption minimizing, thereby realized the signaling consumption that reduces Centroid and sensing node.In addition, utilize the sensing results of dedicated sense time slot to determine candidate's frequency range, the possibility that to have improved candidate's frequency range be idle frequency range, the frequency range that therefore needs sensing node to carry out perception reduces, and has reduced the overall power consumption of sensing node.
Fig. 3 is the flow chart that the present invention determines another embodiment of method of idle frequency range, and this embodiment introduces the handling process of Centroid side, and as shown in Figure 3, this embodiment comprises:
In the present embodiment, a complete perception cycle is divided into at least one dedicated sense time slot and at least one public perception time slot.Fig. 2 is the structural representation of a perception cycle of the present invention embodiment, in Fig. 2, dedicated sense time slot is identical with the quantity of public perception time slot, but the embodiment of the present invention is not limited in this, when practical application, the quantity of flexible configuration dedicated sense time slot and public perception time slot according to actual needs.
Particularly, according to the sensing results of dedicated sense time slot, determine that candidate's frequency range can be: according to the sensing results of dedicated sense time slot, determine occupied frequency range, and determine the priority that remains frequency range in frequency range to be detected after the occupied frequency range of eliminating; According to priority, residue frequency range is sorted, and in the residue frequency range after sequence, select the frequency range of some as candidate's frequency range.For instance, suppose at dedicated sense time slot, Centroid adopts energy measuring mode, and the reflection of the sensing results of dedicated sense time slot is the watt level measuring in frequency range to be detected; If the power of part frequency range to be detected is greater than predefined thresholding, can determine that these frequency ranges are occupied, by its eliminating.The measurement power that remains afterwards frequency range due to the occupied frequency range of eliminating in frequency range to be detected is less, the occupied probability of this residue frequency range is lower, the probability that this residue frequency range is idle frequency range is larger, therefore can determine according to the measurement performance number of residue frequency range the priority of residue frequency range, the measurement performance number of residue frequency range is less, and priority is higher.Then according to this priority, residue frequency range is sorted, after sequence, can be according to the priority of current bandwidth demand and residue frequency range, according to priority order from high to low, in residue frequency range after sequence, select the frequency range of some as candidate's frequency range, for example, select the frequency range that is less than predefined threshold value number as candidate's frequency range.
(1) distribute to frequency location and the bandwidth of candidate's frequency range of its detection of needs of sensing node;
(2) the perception duration;
(3) type of perceived signal;
(4) requirement to perceptual performance.
In the present embodiment, at dedicated sense time slot, only Centroid carries out perception to frequency range to be detected, therefore without signaling consumption; And at public perception time slot, owing to having got rid of the occupied frequency range of part, so signaling consumption minimizing, thereby realized the signaling consumption that reduces Centroid and sensing node.In addition, according to the sensing results of dedicated sense time slot, determine candidate's frequency range, the possibility that to have improved candidate's frequency range be idle frequency range, the frequency range that therefore needs sensing node to carry out perception reduces, and has reduced the overall power consumption of sensing node.And at public perception time slot, Centroid participates in the perception of candidate's frequency range, sensing results and this Centroid of finally according to sensing node, reporting are determined idle frequency range to the sensing results of this candidate's frequency range, have improved the accuracy of definite idle frequency range.
Fig. 4 is the flow chart that the present invention determines another embodiment of method of idle frequency range, and this embodiment introduces the handling process of sensing node side, and as shown in Figure 4, this embodiment comprises:
(1) distribute to frequency location and the bandwidth of candidate's frequency range of its detection of needs of sensing node;
(2) the perception duration;
(3) type of perceived signal;
(4) requirement to perceptual performance.
In the present embodiment, Centroid carries out perception at dedicated sense time slot to frequency range to be detected, according to sensing results, determine candidate's frequency range, then Centroid sends perception scheduling indication to sensing node, and indication sensing node carries out perception at public perception time slot to candidate's frequency range.
In the present embodiment, sensing node does not participate in the perception of dedicated sense time slot, only at public perception time slot, candidate's frequency range is carried out to perception, thereby has reduced signaling consumption.And to be Centroid determine according to the sensing results of dedicated sense time slot candidate's frequency range, the possibility that to have improved candidate's frequency range be idle frequency range, so the frequency range that sensing node need to carry out perception reduces, and reduced the overall power consumption of sensing node.
The method of definite idle frequency range that the embodiment of the present invention proposes can be used in cellular network, at this moment Centroid can be positioned at base station, relay station and/or gateway, and sensing node can be positioned at the node that terminal, base station, relay station and/or sensor node etc. have air interface.At this moment, when the method that adopts the embodiment of the present invention to propose is determined idle frequency range, also need to determine whether at least one quiet period is set in radio frames according to the ability of Centroid and perception type, using this quiet period as dedicated sense time slot or public perception time slot.
Particularly, for dedicated sense time slot, when Centroid has the ability of carrying out frequency spectrum perception and transfer of data simultaneously, and perception type is, while being with outer perception, quiet period not to be set in radio frames;
When Centroid does not have the ability of carrying out frequency spectrum perception and transfer of data simultaneously, and when perception type is the outer perception of band, determine at least one quiet period need to be set in radio frames, and using quiet period as dedicated sense time slot, in this quiet period, Centroid stops receiving normal service signal, but receives the signal in frequency range to be detected;
When Centroid has the ability of carrying out frequency spectrum perception and transfer of data simultaneously, and when perception type is the interior perception of band, quiet period need to be set in radio frames, Centroid and sensing node only need to keep mourning in silence in frequency range to be detected, and the regular traffic in other frequency ranges except frequency range to be detected is unaffected;
When Centroid does not have the ability of carrying out frequency spectrum perception and transfer of data simultaneously, and when perception type is the interior perception of band, determine at least one quiet period need to be set in radio frames, and using quiet period as dedicated sense time slot, in this quiet period, Centroid stops receiving normal service signal, but receives the signal in frequency range to be detected; When Centroid is positioned at BS, the upward signal of the terminal that this BS serves also should be avoided frequency range to be detected.
For public perception time slot, when Centroid has the ability of carrying out frequency spectrum perception and transfer of data simultaneously, and perception type is for band is during outer perception, and no matter whether Centroid participates in the perception of public perception time slot, and quiet period all need to be set in radio frames;
When Centroid does not have the ability of carrying out frequency spectrum perception and transfer of data simultaneously, and when perception type is the outer perception of band, if Centroid will carry out perception to candidate's frequency range, determine at least one quiet period need to be set in radio frames, using this quiet period as public perception time slot, in this quiet period, Centroid need to stop receiving normal service signal, but receives the signal in candidate's frequency range;
When Centroid has the ability of carrying out frequency spectrum perception and transfer of data simultaneously, and when perception type is the interior perception of band, no matter whether Centroid participates in the perception of public perception time slot, all quiet period need to be set in radio frames, only need Centroid and sensing node in candidate's frequency range, to keep mourning in silence, and regular traffic in other frequency ranges except candidate's frequency range is unaffected;
When Centroid does not have the ability of carrying out frequency spectrum perception and transfer of data simultaneously, and when perception type is the interior perception of band, if Centroid will carry out perception to candidate's frequency range, determine at least one quiet period need to be set in radio frames, using this quiet period as public perception time slot, in this quiet period, Centroid need to stop receiving normal service signal, but receives the signal in candidate's frequency range; If Centroid does not participate in the perception of public perception time slot, only need in candidate's frequency range, keep mourning in silence, the regular traffic in other frequency ranges except candidate's frequency range is unaffected.
At time division duplex (Time Division Duplex; Hereinafter to be referred as: TDD) in system, due to the restriction of capacity of equipment and the impact of propagation delay, the position of changing to sub-frame of uplink to position and the descending sub frame of descending sub frame conversion at the sub-frame of uplink of radio frames, need reserved certain guard time, be respectively a receipts/conversion interval (Receive/Transmit Transition Gap; Hereinafter to be referred as: RTG) with send out/receipts conversion interval (Transmit/Receive Transition Gap; Hereinafter to be referred as: TTG).RTG and TTG are the intrinsic expenses of TDD system.And the above-mentioned quiet period inevitable signaling consumption that is cognitive radio system, therefore can RTG and/or TTG and quiet period is complete overlapping or partly overlap, to reduce total signaling consumption.Particularly; in TDD system; above-mentioned quiet period can be arranged on to the position that in radio frames, sub-frame of uplink and descending sub frame are changed mutually; and using the protection interval of this quiet period while mutually changing as sub-frame of uplink and descending sub frame; as shown in Figure 5, Fig. 5 is the schematic diagram of an embodiment of quiet period setting position of the present invention.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Fig. 6 is the structural representation of an embodiment of Centroid of the present invention, the Centroid of this embodiment can be used as base station, relay station or gateway, or be arranged in one or more of base station, relay station and gateway, for example: Centroid can only be positioned on base station, also can partly be positioned at base station, part is positioned at gateway, realizes flow process as embodiment illustrated in fig. 1 in the present invention.
As shown in Figure 6, this Centroid comprises: broadband sensing module 61, candidate's frequency range determination module 62, indication sending module 63, sensing results receiver module 64 and idle frequency range determination module 65.
In the present embodiment, a complete perception cycle is divided into at least one dedicated sense time slot and at least one public perception time slot.Fig. 2 is the structural representation of a perception cycle of the present invention embodiment, in Fig. 2, dedicated sense time slot is identical with the quantity of public perception time slot, but the embodiment of the present invention is not limited in this, when practical application, the quantity of flexible configuration dedicated sense time slot and public perception time slot according to actual needs.
Wherein, broadband sensing module 61 can, at dedicated sense time slot, carry out perception to frequency range to be detected; Candidate's frequency range determination module 62 can be determined candidate's frequency range according to the sensing results of broadband sensing module 61; Indication sending module 63 can send perception scheduling indication to sensing node, and scheduling sensing node carries out perception at public perception time slot to the definite candidate's frequency range of candidate's frequency range determination module 62; Sensing results receiver module 64 receives the sensing results that sensing node reports, and the sensing results then being received according to sensing results receiver module 64 by idle frequency range determination module 65 is determined idle frequency range.
Perception in the present embodiment scheduling indication comprises one or more in following information:
(1) distribute to frequency location and the bandwidth of candidate's frequency range of its detection of needs of sensing node;
(2) the perception duration;
(3) type of perceived signal;
(4) requirement to perceptual performance.
In the present embodiment, at dedicated sense time slot, sensing module 61 pairs of frequency ranges to be detected in broadband are carried out perception, and sensing node does not participate in the perception of dedicated sense time slot, therefore without signaling consumption; And candidate's frequency range determination module 62 is determined candidate's frequency range according to the sensing results of broadband sensing module 61, got rid of the occupied frequency range of part, therefore reduce the signaling consumption of public perception time slot, thereby realized the signaling consumption that reduces Centroid and sensing node.In addition, candidate's frequency range determination module 62 is determined candidate's frequency range according to the sensing results of broadband sensing module 61, the possibility that to have improved candidate's frequency range be idle frequency range, and the frequency range that therefore needs sensing node to carry out perception reduces, and has reduced the overall power consumption of sensing node.
Fig. 7 is the structural representation of another embodiment of Centroid of the present invention, the Centroid of this embodiment can be used as base station, relay station or gateway, or be arranged in one or more of base station, relay station and gateway, for example: Centroid can only be positioned on base station, also can partly be positioned at base station, part is positioned at gateway, realizes flow process as embodiment illustrated in fig. 2 in the present invention.
As shown in Figure 7, this Centroid comprises: broadband sensing module 71, candidate's frequency range determination module 72, indication sending module 73, sensing results receiver module 74, idle frequency range determination module 75 and thin sensing module 76.
In the present embodiment, a complete perception cycle is divided into at least one dedicated sense time slot and at least one public perception time slot.Fig. 2 is the structural representation of a perception cycle of the present invention embodiment, in Fig. 2, dedicated sense time slot is identical with the quantity of public perception time slot, but the embodiment of the present invention is not limited in this, when practical application, the quantity of flexible configuration dedicated sense time slot and public perception time slot according to actual needs.
Wherein, broadband sensing module 71 can, at dedicated sense time slot, carry out perception to frequency range to be detected; Candidate's frequency range determination module 72 can be determined candidate's frequency range according to the sensing results of broadband sensing module 71; Indication sending module 73 can send perception scheduling indication to sensing node, and scheduling sensing node carries out perception to the definite candidate's frequency range of candidate's frequency range determination module 72; After public perception time slot finishes, sensing results receiver module 74 receives the sensing results that sensing node reports, and the sensing results then being received according to sensing results receiver module 74 by idle frequency range determination module 75 is determined idle frequency range.
Perception in the present embodiment scheduling indication comprises one or more in following information:
(1) distribute to frequency location and the bandwidth of candidate's frequency range of its detection of needs of sensing node;
(2) the perception duration;
(3) type of perceived signal;
(4) requirement to perceptual performance.
Wherein, candidate's frequency range determination module 72 can comprise definite submodule 721, sequence submodule 722 and chooser module 723.Determine that submodule 721 can be according to the sensing results of broadband sensing module 71, definite occupied frequency range; Sequence submodule 722 can carry out prioritization to getting rid of above-mentioned occupied frequency range residue frequency range afterwards in frequency range to be detected, then, chooser module 723 can select the frequency range of some as candidate's frequency range in the above-mentioned residue frequency range after 722 sequences of sequence submodule.For instance, suppose at dedicated sense time slot, Centroid adopts energy measuring mode, and the reflection of the sensing results of dedicated sense time slot is the watt level measuring in frequency range to be detected; If the power of part frequency range to be detected is greater than predefined thresholding, definite submodule 721 can determine that these frequency ranges are occupied, by its eliminating.The measurement power that remains afterwards frequency range due to the occupied frequency range of eliminating in frequency range to be detected is less, the occupied probability of this residue frequency range is lower, the probability that this residue frequency range is idle frequency range is larger, therefore determine that submodule 721 can be according to the priority of the definite residue of the measurement performance number frequency range of residue frequency range, the measurement performance number of residue frequency range is less, and priority is higher.Then the submodule 722 that sorts sorts to residue frequency range according to this priority, after sequence, chooser module 723 is according to the priority of current bandwidth demand and the definite residue frequency range of definite submodule 721, according to priority order from high to low, in residue frequency range after sequence, select the frequency range of some as candidate's frequency range, for example, select the frequency range that is less than predefined threshold value number as candidate's frequency range.
This Centroid can also comprise: thin sensing module 76.Thin sensing module 76 can carry out perception to candidate's frequency range at public perception time slot, and after public perception time slot finishes, obtains the sensing results of candidate's frequency range; At this moment, the sensing results of candidate's frequency range that idle frequency range determination module 75 can further obtain according to thin sensing module 76 is determined idle frequency range, and the sensing results of candidate's frequency range that the sensing results that idle frequency range determination module 75 can receive according to sensing results receiver module 74 and thin sensing module 76 obtain is determined idle frequency range.
In the present embodiment, at dedicated sense time slot, sensing module 71 pairs of frequency ranges to be detected in broadband are carried out perception, and sensing node does not participate in the perception of dedicated sense time slot, therefore without signaling consumption; And candidate's frequency range determination module 72 is determined candidate's frequency range according to the sensing results of broadband sensing module 71, got rid of the occupied frequency range of part, therefore reduce the signaling consumption of public perception time slot, thereby realized the signaling consumption that reduces Centroid and sensing node.In addition, candidate's frequency range determination module 72 is determined candidate's frequency range according to the sensing results of broadband sensing module 71, the possibility that to have improved candidate's frequency range be idle frequency range, so the frequency range that sensing node need to carry out perception reduces, and reduced the overall power consumption of sensing node.And, at public perception time slot, thin 76 pairs of candidate's frequency ranges of sensing module are carried out perception, the sensing results of candidate's frequency range that the sensing results that last idle frequency range determination module 75 receives according to sensing results receiver module 74 and thin sensing module 76 obtain is determined idle frequency range, has improved the accuracy of definite idle frequency range.
It should be noted that, in the Centroid shown in Fig. 6 or Fig. 7, the broadband sensing module 61 in Fig. 6, or the broadband sensing module in Fig. 7 71 can share a receiver with the reception of other signals with thin sensing module 76; Also perception receiver can be set separately in Centroid, at this moment Centroid has the ability of simultaneously carrying out frequency spectrum perception and transfer of data, broadband sensing module 61 in Fig. 6, or the broadband sensing module in Fig. 7 71 shares receiver with thin sensing module 76 without the reception with other signals.
Fig. 8 is the structural representation of an embodiment of sensing node of the present invention, and the sensing node of this embodiment can be used as the node with air interface, or is arranged in the node with air interface, realizes flow process as embodiment illustrated in fig. 4 in the present invention; The node with air interface comprises terminal, base station, relay station and sensor node etc.As shown in Figure 8, this sensing node comprises: receiver module 81, sensing module 82 and reporting module 83.
Wherein, the perception scheduling indication that receiver module 81 sends for receiving center node, this perception scheduling indication is used to indicate sensing node, at public perception time slot, candidate's frequency range is carried out to perception.In the present embodiment, Centroid carries out perception at dedicated sense time slot to frequency range to be detected, according to sensing results, determine candidate's frequency range, then at public perception time slot, Centroid sends perception scheduling indication to sensing node, indication sensing node carries out perception to candidate's frequency range, and receiver module 81 receives this perception scheduling indication.
Perception in the present embodiment scheduling indication comprises one or more in following information:
(1) distribute to frequency location and the bandwidth of candidate's frequency range of its detection of needs of sensing node;
(2) the perception duration;
(3) type of perceived signal;
(4) requirement to perceptual performance.
After receiver module 81 receives perception scheduling indication, the perception scheduling indication that sensing module 82 can receive according to receiver module 81, carries out perception to candidate's frequency range; Then after public perception time slot finishes, reporting module 83 reports the sensing results of sensing module 82 to Centroid.Then, the sensing results being reported according to reporting module 83 by Centroid, determines idle frequency range.
In the present embodiment, the sensing module 82 of sensing node does not participate in the perception of dedicated sense time slot, only at public perception time slot, candidate's frequency range is carried out to perception, thereby has reduced signaling consumption.And to be Centroid determine according to the sensing results of dedicated sense time slot candidate's frequency range, the possibility that to have improved candidate's frequency range be idle frequency range, so the frequency range that sensing module 82 need to carry out perception reduces, and reduced the overall power consumption of sensing node.
Fig. 9 is the structural representation that the present invention determines an embodiment of system of idle frequency range, and the system of definite idle frequency range of this embodiment can be used as a cognitive radio system or as the part of a cognitive radio system.As shown in Figure 9, this system comprises a Centroid 91 and at least one sensing node 92.
In the present embodiment, a complete perception cycle is divided into at least one dedicated sense time slot and at least one public perception time slot.Fig. 2 is the structural representation of a perception cycle of the present invention embodiment, in Fig. 2, dedicated sense time slot is identical with the quantity of public perception time slot, but the embodiment of the present invention is not limited in this, when practical application, the quantity of flexible configuration dedicated sense time slot and public perception time slot according to actual needs.
The perception scheduling indication that sensing node 92 receiving center nodes 91 send, this perception scheduling indication is used to indicate sensing node 92, at public perception time slot, candidate's frequency range is carried out to perception; According to this perception scheduling indication, 92 pairs of candidate's frequency ranges of sensing node are carried out perception, and report sensing results to Centroid 91.
In addition, Centroid 91 also can carry out perception to candidate's frequency range at public perception time slot, and obtains the sensing results of candidate's frequency range; At this moment, the sensing results that Centroid 91 can report according to sensing node 92 and the sensing results of above-mentioned candidate's frequency range are determined idle frequency range.
Particularly, Centroid 91 can be realized by the Centroid shown in Fig. 6 or Fig. 7, and sensing node 92 can be realized by sensing node as shown in Figure 8.
In the present embodiment, at dedicated sense time slot, only 91 pairs of frequency ranges to be detected of Centroid are carried out perception, therefore without signaling consumption; And at public perception time slot, owing to having got rid of the occupied frequency range of part, so signaling consumption minimizing, thereby realized the signaling consumption that reduces Centroid 91 and sensing node 92.In addition, Centroid 91 utilizes the sensing results of dedicated sense time slot to determine candidate's frequency range, the possibility that to have improved candidate's frequency range be idle frequency range, so the frequency range that sensing node 92 need to carry out perception reduces, and reduced the overall power consumption of sensing node 92.And, at public perception time slot, Centroid 91 can participate in the perception of candidate's frequency range, and the sensing results finally reporting according to sensing node 92 and the sensing results of 91 pairs of these candidate's frequency ranges of this Centroid are determined idle frequency range, have improved the accuracy of definite idle frequency range.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
Finally it should be noted that: above embodiment is only in order to technical scheme of the present invention to be described but not be limited, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can be modified or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme depart from the spirit and scope of technical solution of the present invention.
Claims (12)
1. determine a method for idle frequency range, it is characterized in that, comprising:
A complete perception cycle is divided into at least one dedicated sense time slot and at least one public perception time slot;
At described dedicated sense time slot, Centroid carries out perception to frequency range to be detected, according to the sensing results of described dedicated sense time slot, determines candidate's frequency range;
Described Centroid sends perception scheduling indication to sensing node, dispatches described sensing node, at described public perception time slot, described candidate's frequency range is carried out to perception;
Described Centroid receives the sensing results that described sensing node reports, and the sensing results reporting according to described sensing node is determined idle frequency range.
2. method according to claim 1, is characterized in that, the described sensing results according to described dedicated sense time slot determines that candidate's frequency range comprises:
According to the sensing results of described dedicated sense time slot, determine occupied frequency range, and determine the priority that remains frequency range in described frequency range to be detected described in eliminating after occupied frequency range;
According to described priority, described residue frequency range is sorted;
In residue frequency range after sequence, select candidate's frequency range.
3. method according to claim 1, is characterized in that, also comprises: at described public perception time slot, described candidate's frequency range is carried out to perception, obtain the sensing results of described candidate's frequency range;
The described sensing results reporting according to described sensing node is determined idle frequency range, further comprises:
According to the sensing results of described candidate's frequency range, determine idle frequency range.
4. according to the method described in claim 1-3 any one, it is characterized in that, also comprise: at least one quiet period is set in radio frames, usings described quiet period as described dedicated sense time slot or described public perception time slot.
5. method according to claim 4; it is characterized in that; in tdd systems; described quiet period is arranged on to the position that in described radio frames, sub-frame of uplink and descending sub frame are changed mutually, and usings the protection interval of described quiet period while mutually changing as described sub-frame of uplink and described descending sub frame.
6. a Centroid, is characterized in that, comprising:
Broadband sensing module, at dedicated sense time slot, carries out perception to frequency range to be detected; Described dedicated sense time slot comprises at least one dedicated sense time slot, and described at least one dedicated sense time slot is by being divided into at least one dedicated sense time slot and at least one public perception time slot acquisition a complete perception cycle;
Candidate's frequency range determination module, for determining candidate's frequency range according to the sensing results of described broadband sensing module;
Indication sending module, for send perception scheduling indication to sensing node, dispatches described sensing node, at public perception time slot, the definite candidate's frequency range of described candidate's frequency range determination module is carried out to perception;
Sensing results receiver module, the sensing results reporting for receiving described sensing node;
Idle frequency range determination module, determines idle frequency range for the sensing results receiving according to described sensing results receiver module.
7. Centroid according to claim 6, is characterized in that, described candidate's frequency range determination module comprises:
Determine submodule, for according to the sensing results of described broadband sensing module, determine occupied frequency range;
Sequence submodule, for carrying out prioritization to the residue frequency range after occupied frequency range described in described frequency range eliminating to be detected;
Chooser module, selects the frequency range of some as candidate's frequency range for the described residue frequency range after described sequence submodule sequence.
8. Centroid according to claim 6, is characterized in that, also comprises:
Thin sensing module, at described public perception time slot, carries out perception to described candidate's frequency range, and after described public perception time slot finishes, obtains the sensing results of described candidate's frequency range;
Described idle frequency range determination module is further used for determining idle frequency range according to the sensing results of candidate's frequency range of described thin sensing module acquisition.
9. Centroid according to claim 6, is characterized in that, described Centroid is arranged in one or more of base station, relay station and gateway.
10. a sensing node, is characterized in that, comprising:
Receiver module, the perception sending for receiving center node scheduling indication, described perception scheduling indication is used to indicate described sensing node, at public perception time slot, candidate's frequency range is carried out to perception; Described candidate's frequency range is by being divided into at least one dedicated sense time slot and at least one public perception time slot a complete perception cycle, described Centroid is at described dedicated sense time slot, frequency range to be detected is carried out to perception, according to the sensing results of described dedicated sense time slot, determine;
Sensing module, for the perception scheduling indication receiving according to described receiver module, carries out perception to described candidate's frequency range;
Reporting module, for after described public perception time slot finishes, reports the sensing results of described sensing module to described Centroid.
11. sensing nodes according to claim 10, is characterized in that, described sensing node is positioned at the node with air interface, described in there is air interface node comprise: terminal, base station, relay station and sensor node.
12. 1 kinds of systems of determining idle frequency ranges, is characterized in that, comprise according to the Centroid described in claim 6-9 any one and at least one is according to the sensing node described in claim 10 or 11.
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| CN102130733B (en) * | 2011-04-19 | 2013-07-03 | 中国电子科技集团公司第五十四研究所 | Radio spectrum sensing realization method |
| CN102223191B (en) * | 2011-06-02 | 2014-11-05 | 电信科学技术研究院 | Method and equipment for acquiring idle spectrum |
| CN107666381B (en) | 2011-10-14 | 2020-08-07 | 索尼公司 | Apparatus and method for use in a radio communication system and computer storage medium |
| CN103124199B (en) * | 2011-11-21 | 2015-01-28 | 华为技术有限公司 | Method, device and data frame for sensing spectrum |
| CN103209032B (en) * | 2012-01-12 | 2015-04-08 | 电信科学技术研究院 | Frequency spectrum sensing method and system |
| CN103052076B (en) * | 2012-08-28 | 2016-07-20 | 深圳市国电科技通信有限公司 | A kind of discrete narrow band realizes the method for broadband data transmission |
| CN103634058A (en) * | 2012-08-29 | 2014-03-12 | 中兴通讯股份有限公司 | Frequency spectrum detection method and device without quiet period |
| CN104796906B (en) * | 2014-01-20 | 2019-03-15 | 中国联合网络通信集团有限公司 | A kind of method and device of pair of Internet of Things perception extended layer dynamic group net |
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| CN105208663B (en) * | 2014-06-10 | 2020-01-31 | 上海朗帛通信技术有限公司 | Scheduling method and device for unlicensed spectrum communication |
| CN104159233B (en) * | 2014-07-31 | 2017-11-28 | 东南大学 | It is used to solve the approximation method for perceiving slot length in a kind of cognitive radio |
| CN106357357B (en) * | 2015-07-17 | 2019-08-23 | 普天信息技术有限公司 | A kind of frequency spectrum sensing method and system |
| CN107592174A (en) * | 2017-09-12 | 2018-01-16 | 河南工业大学 | A kind of high-efficiency frequency spectrum cognitive method in intelligent grid communication |
| CN108847910B (en) * | 2018-08-23 | 2021-02-02 | 广州海格通信集团股份有限公司 | Spectrum sensing method and device and spectrum sensing equipment |
| CN111756459B (en) * | 2019-03-29 | 2021-11-19 | 华为技术有限公司 | Method and device for sending and receiving synchronous signals |
| WO2020199766A1 (en) | 2019-03-29 | 2020-10-08 | 华为技术有限公司 | Methods and apparatuses for transmitting and receiving synchronization signal |
| CN111313993B (en) * | 2019-11-19 | 2022-03-22 | 四川安迪科技实业有限公司 | Method and system for monitoring idle spectrum resources of satellite |
| CN113747461A (en) * | 2020-05-30 | 2021-12-03 | 华为技术有限公司 | Method and device for sensing target object |
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