CN102647720A - System and method for sub-band frequency hopping external interference avoidance based on long term evolution (LTE) - Google Patents
System and method for sub-band frequency hopping external interference avoidance based on long term evolution (LTE) Download PDFInfo
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- CN102647720A CN102647720A CN2012101295627A CN201210129562A CN102647720A CN 102647720 A CN102647720 A CN 102647720A CN 2012101295627 A CN2012101295627 A CN 2012101295627A CN 201210129562 A CN201210129562 A CN 201210129562A CN 102647720 A CN102647720 A CN 102647720A
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Abstract
The invention discloses a system and a method for sub-band frequency hopping external interference avoidance based on long term evolution (LTE). The system comprises an initialization module, an assignment module, a sub-band determination module and a broadcasting module, wherein the initialization module is used for dividing the whole frequency spectrum of a cell into M sub-bands, all users in the cell are divided into N clusters according to geographic locations of users, M is larger than or equals to N, one of the users is set as a cluster head in each of the clusters, and a base station assigns a cluster number to each of the users; the assignment module instructs the base station to select N sub-bands from M sub-bands according to channel interference of cluster heads and assigns one of the sub-bands to all clusters, and the base station assigns one channel resource at a corresponding position in one sub-band to users of each of the clusters; the sub-band determination module instructs the base station to determine sub-band frequency hopping patterns according to the channel interference of cluster heads; and the broadcasting module is used by the base station for sending broadcasting sub-band frequency hopping results to all users. By the aid of the system and the method, the problems that external system interference exists in current smart grids and huge dispatching signaling overhead caused by a large user volume are solved.
Description
Technical field
The present invention relates to a kind of subband hopping external disturbance based on LTE and avoid system and method, a kind of subband hopping external disturbance based on LTE that particularly relates in the intelligent grid is avoided system and method.
Background technology
Intelligent grid has smoothly been integrated regenerative resource and alternative energy source as a kind of modern electric power network infrastructure through automation control and modern communication technology, has improved efficient simultaneously, reliability and fail safe.The existing electrical network that lacks communication capability of contrast, intelligent grid infrastructure has powerful remote sensing, advanced person's communication and computing capability.Different system components links together through communication path and sensor node, has improved interoperability each other, for example: transmission of electricity, distribution and other transformer stations.
As everybody knows, communication system is the important component part of intelligent grid infrastructure.Wired and wireless these two main communication mediums are supported the different communication technologys, can be used for the transfer of data between intelligent electric meter and the Utilities Electric Co..Advanced broadband wireless system can provide better quality products at good values, disposes fast, installs cheaply, insert widely and mobile communication, and these all are the benefits that cable communicating technology even old arrowband wireless technology often can't provide.Yet in the past because low data rate, relevant interference, safe, limited problems such as product availability, wireless technology can only be accepted in power industry more slowly; Several activities have started and have solved the problems referred to above, and require to confirm that suitable wireless technology especially is applied to the technology of intelligent grid.From nearest development and the activity carried out, can see the effort of carrying out for various intelligent use are provided; Various standardized wireless communication techniques have been adopted, for example: the MobileFi etc. that based on the WiMAX of IEEE 802.11 WLANs, IEEE 802.16 standards, 3G/4G honeycomb, based on ZigBee, 802.20 standards of IEEE802.15 is the basis.Fig. 1 is the system architecture diagram that adopts the LTE cellular system of wireless technology in the current intelligent grid, and it comprises base station, user and external equipment, has formed special wireless broadband network.
As everyone knows, interference is the one of the main reasons that wireless network performance is degenerated.Successful channel allocation algorithm design is through on interfering link, using non-overlapped channel to reduce the interference in the network range.Yet, except in the sub-district with the interference of minizone, different with the scene of common honeycomb LTE (Long Term Evolution, Long Term Evolution) system, in intelligent grid, also exist uncontrollable external disturbance.For example, in the frequency range of 230MHz, might be that department of astronomy unifies the radio positioning system of intelligent grid frequency spectrum simultaneously in operation.Wireless transmission that these are outside and equipment, owing under the control of heterogeneous networks operator, do not consider usually in the channel allocation, so their activity is to be difficult to catch.
In addition, the wireless channel decline at intelligent grid is quite slowly.Because most user and the fixed position of base station deployment in intelligent grid, the radio channel variation between user and its relevant base station is compared and moved the LTE environment is quite slowly.Therefore, it there is no need per 10 milliseconds of renewal channel condition informations as common honeycomb LTE system call.In addition, the number of users in the sub-district of intelligent grid is far away more than general cellular cell, usually according to cell size and geographic area, and the channel resource of thousands of equipment requirements 10,000 [1].Therefore the LTE system is huge at the cost of intelligent grid scheduling.
In sum, can know that the intelligent grid of prior art exists external system interference and large user's amount to bring the problem of huge dispatch expense, therefore be necessary to propose improved technological means in fact, solve this problem.
Summary of the invention
For overcoming the deficiency that above-mentioned prior art exists; The present invention's purpose is to provide a kind of subband hopping external disturbance based on LTE to avoid system and method, measures the problem of bringing huge dispatch expense with external system interference and the large user who solves in the intelligent grid.
For reaching above-mentioned and other purpose, the present invention provides a kind of subband hopping external disturbance based on LTE to avoid system, is applied to comprise the intelligent grid of base station, user and external equipment, and this system comprises:
The initialization module is used for the entire spectrum of sub-district is divided into M subband, and all users in this sub-district are divided into N bunch according to its geographical position; Wherein satisfy M >=N; In one bunch, to set one of them user and be bunch head, the base station distributes a bunch of numbering for each user;
Distribute module, be used for selecting N subband according to the channel disturbance indication base station of bunch head from this M subband, distribute a subband for then each bunch, the base station is distributed in a channel resource of relative position in the subband for the user in each bunch;
Subband is confirmed module, is used for confirming the subband hopping pattern according to the channel disturbance indication base station of bunch head; And
The broadcasting module, base station broadcast subband hopping result gives all users.
Further, this base station is with CEIL (log
2(M! / (M-N)! )) flag bit of position bit representes the frequency-hopping mode of all subbands, wherein CEIL (X) expression is not less than the smallest positive integral of X.
Further, first bit representation base station of this channel disturbance indication and bunch head receive the situation of external disturbance in first sub-band channel, and the second bit representation base station and bunch head receive the situation of external disturbance in second sub-band channel.
Further; Represent that base station and bunch head are disturbed by external equipment in first sub-band channel for first ' 1 ' of this channel disturbance indication, represent that a base station and a bunch base station and bunch head are the clean channel that not disturbed by external equipment in second sub-band channel for second ' 0 ' of this channel disturbance indication.
For reaching above-mentioned and other purposes, the present invention also provides a kind of subband hopping external disturbance avoiding method based on LTE, is applied to comprise the intelligent grid of base station, user and external equipment, and this method comprises the steps:
After step 2, base station receive the channel disturbance indication of this k bunch head, attempt bunch being selected k subband from (M-N+k) individual subband for what k quilt disturbed;
Step 3, base station broadcast Interference Detection require to all bunch heads;
Step 4, receive the requirement of Interference Detection from the base station after, find bunch all M subbands of head scanning that disturb, and report that current channel disturbance indicates to the base station;
Step 5, the base station is selected N subband according to the channel disturbance indication that receives from M subband, and avoids all bunches to receive the interference of external equipment; And
Step 6, base station broadcast subband hopping result, each user switches to the corresponding channel of new subband according to newly assigned subband with channel.
Further, in step 2, if there are enough allocation of subbands to give k bunch to avoid the external equipment interference again, the base station directly obtains the allocation of subbands result, gets into step 6; Otherwise entering step 3.
Further, in step 6, this base station is with CEIL (log
2(M! / (M-N)! )) bit broadcasting subband hopping result.
Compared with prior art; A kind of subband hopping external disturbance based on LTE of the present invention avoids system and method to pass through all user's sub-clusterings; And will bunch in all users be assigned to when the fixing channel of relative position switches with the subband when bunch distribution in the subband; Subband after the corresponding corresponding bunch switching of channel of switching separately of user; Not only avoid the interference of external system, and significantly reduced signaling consumption, solved the external system interference of prior art existence and the problem that large user's amount is brought huge dispatch expense.
Description of drawings
Fig. 1 is the system architecture diagram that adopts the LTE cellular system of wireless technology in the current intelligent grid;
Fig. 2 is a kind of system architecture diagram of avoiding system based on the subband hopping external disturbance of LTE of the present invention;
Subscriber channel resource pre-scheduling sketch map in Fig. 3 bunch;
Fig. 4 is the corresponding CII channel reporting structure of bunch head;
Fig. 5 is the flow chart of steps of a kind of subband hopping external disturbance avoiding method based on LTE of the present invention.
Embodiment
Below through specific instantiation and accompanying drawings execution mode of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by the content that this specification disclosed.The present invention also can implement or use through other different instantiation, and each item details in this specification also can be based on different viewpoints and application, carries out various modifications and change under the spirit of the present invention not deviating from.
Fig. 2 is a kind of system architecture diagram of avoiding system based on the subband hopping external disturbance of LTE of the present invention.As shown in Figure 2, a kind of subband hopping external disturbance based on LTE of the present invention is avoided system, is applied to comprise in the intelligent grid: initialization module 201, distribution module 202, subband are confirmed module 203 and broadcasting module 204.
Wherein, initialization module 201 is used for the entire spectrum of sub-district is divided into M subband, and all users in the sub-district are divided into N bunch according to its geographical position; Wherein satisfy M >=N; In one bunch, to set one of them user and be bunch head, the base station distributes a bunch of numbering for each user.
Distribute module 202, N subband selected according to the channel disturbance indication (CII, Channel Interface Indicator) of bunch head in the base station from M subband, distributes a subband for then each bunch, so CEIL (log need be used in the base station
2(M! / (M-N)! )) flag bit of position bit representes the frequency-hopping mode of all subbands.Here function C EIL (X) expression is not less than the smallest positive integral of X.In this hypothesis, base station and user know the mapping relations between subband hopping pattern and the flag bit.The base station is distributed in a channel resource of relative position in the subband for the user in each bunch, and as shown in Figure 3, the position of the channel resource that the user is assigned in subband is geostationary, even experience subband hopping process.
Here, channel condition information is indicated by CII, and its structural design is as shown in Figure 4.For simplicity, the signal interference ratio that defines among the present invention (SINR, Signal to Interference plus Noise Ratio) threshold value is SINR
Th, for example work as SINR less than SINR
ThShi Xindao is disturbed, and works as SINR more than or equal to SINR
ThShi Xindao is not disturbed.Represent that base station and bunch head are disturbed by external system in first sub-band channel for first ' 1 ' of CII, represent that base station and bunch head are the clean channel that does not receive external disturbance in second sub-band channel for second ' 0 ' of CII.In a word, position ' 1 ' representative ' interference ', position ' 0 ' representative ' noiseless '; Each bit position in the CII structure is represented the sequence number of subband.Therefore, all bunches head only need spend altogether N * M position bit and report their channel condition information, thereby adopts the instruction design of CII to reduce signaling consumption greatly than original channel quality indication (CQI, Channel Quality Indicator).For example, suppose CQI cost K
1Channel quality between position bit quantization user and the base station; A subband comprises K
2Channel; One bunch comprises K
3The user; Report that all users and the CQI between the base station need spend N * M * K
1* K
2* K
3Bit.Use bunch head and CII structure, greatly saved the channel status information reports expense, the chances are N * M * (K
1* K
2* K
3-1) bit.
Subband is confirmed module 203, and the base station is according to the CII decision subband frequency hopping pattern of bunch head, that is, which subband which bunch is assigned to.
Broadcasting module 204, base station broadcast subband hopping result gives all users, thus the channel resource that the user can distribute under its bunch numbering, bunch sub-reel number and the pre-scheduling result obtains the final channel resource that himself is assigned to.
Fig. 5 is the flow chart of steps of a kind of subband hopping external disturbance avoiding method based on LTE of the present invention; As shown in Figure 5; A kind of subband hopping external disturbance avoiding method based on LTE of the present invention is applied to comprise in the intelligent grid of base station, user and external equipment, comprises the steps:
The scheduling scheme of the CQI structure that below will use the present invention and original LTE through an instantiation does one relatively.As previously mentioned, K
1, K
2, K
3Represent respectively in the bit number, subband of channel CQI the number of channel, bunch in number of users.In the scheduling scheme of the CQI structure that original LTE uses, each user effort (K
1* K
2* M) bit comes the up signaling of reporting channel state information, spends (K altogether
1* K
2* K
3The bit of * N * M).Then, (K
2* M) channel can be distributed to (K
3* N) user.For downlink signaling, base station cost CEIL (log
2(K
2* M)) bit indicates the channel of distributing to each user, needs (K altogether
3* N) * CEIL (log
2(K
2* M)) bit.
Table 1 the present invention and original LTE strategy scheduling overhead are relatively
Enumerated the comparative result of CQI structure under signaling consumption of the present invention and the original LTE at table 1.Adopt M=15, N=10, K1=4, K2=10, K3=25.The present invention is at up signaling and maximum expense 35 bits of downlink signaling and 150 bits, and up signaling consumption 150000 bits of the LTE of original CQI structure are with believing signaling consumption 2000 bits at present.Therefore, the present invention has significantly reduced signaling consumption.
In sum; A kind of subband hopping external disturbance based on LTE of the present invention avoids system and method to pass through all user's sub-clusterings; And will bunch in all users be assigned to when the fixing channel of relative position switches with the subband when bunch distribution in the subband; Subband after the corresponding corresponding bunch switching of channel of switching separately of user; Not only avoid the interference of external system, and significantly reduced signaling consumption, solved the external system interference of prior art existence and the problem that large user's amount is brought huge dispatch expense.
The foregoing description is illustrative principle of the present invention and effect thereof only, but not is used to limit the present invention.Any those skilled in the art all can be under spirit of the present invention and category, and the foregoing description is modified and changed.Therefore, rights protection scope of the present invention should be listed like claims.
Claims (7)
1. the subband hopping external disturbance based on LTE is avoided system, is applied to comprise the intelligent grid of base station, user and external equipment, comprising:
The initialization module is used for the entire spectrum of sub-district is divided into M subband, and all users in this sub-district are divided into N bunch according to its geographical position; Wherein satisfy M >=N; In one bunch, to set one of them user and be bunch head, the base station distributes a bunch of numbering for each user;
Distribute module, be used for selecting N subband according to the channel disturbance indication base station of bunch head from this M subband, distribute a subband for then each bunch, the base station is distributed in a channel resource of relative position in the subband for the user in each bunch;
Subband is confirmed module, is used for confirming the subband hopping pattern according to the channel disturbance indication base station of bunch head; And
The broadcasting module, base station broadcast subband hopping result gives all users.
2. the subband hopping external disturbance based on LTE as claimed in claim 1 is avoided system, and it is characterized in that: this base station is with CEIL (log
2(M! / (M-N)! )) flag bit of position bit representes the frequency-hopping mode of all subbands, wherein CEIL (X) expression is not less than the smallest positive integral of X.
3. the subband hopping external disturbance based on LTE as claimed in claim 1 is avoided system; It is characterized in that: first bit representation base station of this channel disturbance indication and bunch head receive the situation of external disturbance in first sub-band channel, and the second bit representation base station and bunch head receive the situation of external disturbance in second sub-band channel.
4. the subband hopping external disturbance based on LTE as claimed in claim 3 is avoided system; It is characterized in that: represent that base station and bunch head are disturbed by external equipment in first sub-band channel for first ' 1 ' of this channel disturbance indication, represent that base station and bunch head are the clean channel that not disturbed by external equipment in second sub-band channel for second ' 0 ' of this channel disturbance indication.
5. subband hopping external disturbance avoiding method based on LTE is applied to comprise comprise the steps: the intelligent grid of base station, user and external equipment
Step 1, k the existing external equipment of bunch hair disturbs, and to the current channel disturbance indication of base station report;
After step 2, base station receive the channel disturbance indication of this k bunch head, attempt bunch being selected k subband from (M-N+k) individual subband for what k quilt disturbed;
Step 3, base station broadcast Interference Detection require to all bunch heads;
Step 4, receive the requirement of Interference Detection from the base station after, find bunch all M subbands of head scanning that disturb, and report that current channel disturbance indicates to the base station;
Step 5, the base station is selected N subband according to the channel disturbance indication that receives from M subband, and avoids all bunches to receive the interference of external equipment; And
Step 6, base station broadcast subband hopping result, each user switches to the corresponding channel of new subband according to newly assigned subband with channel.
6. the subband hopping external disturbance avoiding method based on LTE as claimed in claim 5 is characterized in that: in step 2, if there are enough allocation of subbands to give k bunch to avoid the external equipment interference again, the base station directly obtains the allocation of subbands result, gets into step 6; Otherwise entering step 3.
7. the subband hopping external disturbance avoiding method based on LTE as claimed in claim 5, it is characterized in that: in step 6, this base station is with CEIL (log
2(M! / (M-N)! )) bit broadcasting subband hopping result.
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