CN100551111C - Single frequency network planning method based on orthogonal frequency division multiplexi - Google Patents
Single frequency network planning method based on orthogonal frequency division multiplexi Download PDFInfo
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- CN100551111C CN100551111C CNB2006101093174A CN200610109317A CN100551111C CN 100551111 C CN100551111 C CN 100551111C CN B2006101093174 A CNB2006101093174 A CN B2006101093174A CN 200610109317 A CN200610109317 A CN 200610109317A CN 100551111 C CN100551111 C CN 100551111C
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Abstract
The invention discloses a kind of single frequency network planning method, solved between the intersection sub-network of existing Single Frequency Network region and channel disturbance occurs, influence the problem of the network quality on border separately based on orthogonal frequency division multiplexi.Comprise the steps: Single Frequency Network is carried out unified resource planning; Provide the region of service to carry out unified addressing to Single Frequency Network, make adjacent region that the different network addresss be arranged; The Single Frequency Network aerial signal is carried out synchronously; Transmitter in the Single Frequency Network and honeycomb are classified; Determine optimum distance between the interior transmitter of described Single Frequency Network; The Single Frequency Network control channel relevant with the region handled; The Single Frequency Network Traffic Channel relevant with the region handled.Single Frequency Network need need reasonably planning to the regionality service at different regions intersection, reduces the differently channel disturbance between domain system, improves the service quality of Single Frequency Network.
Description
Technical field
The present invention relates to field of wireless communication, relate in particular to a kind of planing method of the Single Frequency Network based on OFDM (OFDM:Orthogonal FrequencyDivision Multiplexing) technology.
Technical background
The OFDM technology is a kind of multi-carrier digital modulation technique, also is a kind of multiplex technique, can realize the high-speed radio digital communication.Because the OFDM technology has the transmission rate height, the anti-multipath interference performance is strong, characteristics such as spectrum efficiency height, more and more receive the attention of communication field, Digital Audio Broadcasting), (digital video broadcasting: Digital Video Broadcasting) and based on the WLAN of IEEE802.11 standard (WLAN: the field all obtains practical application to DVB, also mainly all adopts the OFDM modulation technique in the follow-up evolution of third generation mobile WirelessLocal Area Networks) etc. at present in DAB (digital audio broadcasting:.
In recent years, digital multimedia Single Frequency Network (SFN:Single Frequency Networks) technology based on OFDM is developed rapidly, as the DVB network, the main feature of this network is: by the transmitting set that is in synchronous regime (transmitting base station or transmitting station) of a plurality of different locations, at one time, the same signal of same frequency emission, to realize reliable covering to certain service area, this helps frequency planning, save frequency resource, improve the availability of frequency spectrum, so mobile receiving system is identical at synchronization from the radio-frequency electromagnetic signal that different transmitters receive.Yet, if the Single Frequency Network system is except the service that sends whole network, also will send part has the service of areal variation, it is the characteristic (MFN:Multiple Frequency Networks) that multi-frequency network is arranged in the Single Frequency Network, will cause so channel disturbance occurring between the intersection sub-network of region, influence the network quality on border separately, transmit different DMB services so need provide a kind of single frequency network planning method to prevent the channel disturbance of different regions intersection and then can be implemented in different regions based on the OFDM technology at this actual conditions.
Summary of the invention
Defective and deficiency at the prior art existence, the invention provides a kind of channel disturbance that can prevent different regions intersection, transmit the single frequency network planning method based on orthogonal frequency division multiplexi of different DMB services to be implemented in different regions.
For achieving the above object, the present invention by the following technical solutions: a kind of single frequency network planning method based on orthogonal frequency division multiplexi comprises the steps:
Steps A is carried out unified resource planning to Single Frequency Network;
Step B provides the region of service to carry out unified addressing to Single Frequency Network, makes adjacent region that the different network addresss be arranged;
Step C carries out synchronously the Single Frequency Network aerial signal;
Step D classifies to transmitter in the Single Frequency Network and honeycomb;
Step e is determined optimum distance between the interior transmitter of described Single Frequency Network;
Step F is handled the Single Frequency Network control channel relevant with the region;
Step G handles the Single Frequency Network Traffic Channel relevant with the region;
Wherein, steps A comprises the steps:
Steps A 2 is divided into Traffic Channel that is subjected to regional impact and the Traffic Channel that is not subjected to regional impact with the Traffic Channel of Single Frequency Network;
All transmitters send identical control information at the control channel that is not subjected to regional impact in the steps A 3, Single Frequency Network;
All transmitters are being subjected to the control channel of regional impact in the steps A 4, Single Frequency Network, send control information inequality;
All transmitters send identical business information in the Traffic Channel that is not subjected to regional impact in the steps A 5, Single Frequency Network;
All transmitters are being subjected to the Traffic Channel of regional impact in the steps A 6, Single Frequency Network, send business information inequality;
Wherein, step B divides by the service that Single Frequency Network provides described region, and the service that identical air traffic channel resource transmits in different regions in the Single Frequency Network is different;
Wherein, step C is specially:
Step C1 obtains Single Frequency Network internal system maximum delay;
Step C2 is a benchmark with the transmitter of maximum delay in the Single Frequency Network, and other transmitters temporarily are kept at this locality by increasing the method for buffer memory with data to be launched;
Step C3, the time of importing with global positioning system is as the criterion, and when having arrived the time that Single Frequency Network is launched these frame data, just takes out data from buffer memory;
Wherein, transmitter and the honeycomb in the Single Frequency Network is divided into transmitter and border, region transmitter in the region, honeycomb and border, region honeycomb in the region among the step D;
Wherein, the optimum distance between the transmitter described in the step e multiply by the product of aerial signal propagation rate blanking time less than protection in the OFDM parameter;
Wherein, step F is specially:
Wherein, step G is specially: adopt sacrifice border honeycomb method or isolation strip method to realize the Single Frequency Network of the different services of different regions transmission, perhaps adopt sacrifice resource method to realize the Single Frequency Network of the different services of different regions transmission.
Preferably, step C1 is specially:
Step C11, network center's Control Node sends a go-and-return test message at initial timer time to transmitter, comprises identifying code in this message;
Step C12 just returns to network center's Control Node with this message immediately after transmitter is received this message described in the step C11;
Step C13, network center's Control Node just stop timing after receiving the message of returning, and whether the comparatively validate sign indicating number is consistent, and initial sum difference deadline is exactly the twice of the time-delay of transmitter described in the step C11.
Preferably, step F 2 is specially:
Border, region honeycomb is in the control messages of a region of former frame transmission, and back one frame sends the control messages of another region, and the addressing sign that increases the region in the message is to provide the receiving terminal system identification.
Wherein, described sacrifice border honeycomb method or isolation strip method are the service that does not transmit areal variation in the honeycomb of the border, region of at least one side of region intersection; Described sacrifice resource method is that the areal variation service is alternately transmitted in the both sides, region, and promptly former frame transmits the regionality service of a region, and next frame transmits the regionality service of adjacent region.
In described steps A, Single Frequency Network is carried out unified resource planning, no matter the Single Frequency Network system adopts frequency division mode or time division way, to service that is not subjected to regional impact and strict division of service that is subjected to regional impact, the control channel and business (data) channel that comprise Single Frequency Network, the air resource of unified distribution Single Frequency Network system is if the Single Frequency Network system according to the frequency division mode, just distributes frequency unitedly; If the Single Frequency Network system is according to time division way, with regard to the unified distribution time, promptly in ofdm system, unified distribution OFDM symbol, at the shared air resource of the service that is not subjected to regional impact, unifiedly in every frame take identical OFDM symbol, also unified distribution is subjected to the shared OFDM symbol of service of regional impact simultaneously, and this resource is in inter-domain sharing differently.
In described step B, unified addressing is carried out in the region, make adjacent region that the different network addresss be arranged, to distinguish the region, the region notion here can be divided by the service that Single Frequency Network provides, and two region services relevant with the region that identical air traffic channel resource transmits in Single Frequency Network are different.
In described step C, the Single Frequency Network aerial signal is synchronous and since the characteristics of Single Frequency Network be different transmitters at one time, the same signal of same frequency emission, so need to consider aerial signal stationary problem between transmitter.Usually network system is by network center Control Node unification each transmitter transmit traffic data in network, physics between network center's Control Node and the transmitter transmits media can be had multiple, as wired, wireless (satellite, microwave etc.) etc., but the sort of mode no matter, data arrive transmitter from network center's Control Node all different time-delays, the area coverage of Single Frequency Network is big more, the network system internal delay time is just big more, if do not consider the network system internal delay time, the Single Frequency Network system will produce interchannel interference and OFDM intersymbol interference so, so the network system internal delay time is very big to aerial signal influence synchronously.
Solve the Single Frequency Network aerial signal and need consider two aspect problems synchronously: at first, obtain the inner maximum delay of network system, can pass through network system close beta method or appraisal procedure; Next is exactly according to the definite transmitter cache size of network system time-delay, is not losing before the transmitter emission or the frame data covering of quilt back to guarantee data; At last, send simultaneously in order to guarantee every frame data all transmitters in Single Frequency Network, according to maximum delay in the network system, synchronously aerial by every frame data increase stamp method launch time is unified launch time to guarantee in network center's Control Node.
In described step D, transmitter and honeycomb are classified, be divided into transmitter and border, region transmitter in the region and the honeycomb on border, region is defined as the border honeycomb.
In described step e, to based in the Single Frequency Network of OFDM technology between transmitter the distance calculate.In Single Frequency Network signal cross overlay area; because receiving system can receive same signal from different transmitters; but arrive the time existence propagation difference of receiving terminal from the signal of different transmitters; if propagate difference less than protection interval (Cyclic Prefix) in the OFDM parameter; interchannel interference and OFDM intersymbol interference just can not occur, the optimum distance between the cell site multiply by aerial signal propagation rate (being the light velocity in the air) blanking time less than protecting in the OFDM parameter.
In described step F, the Single Frequency Network control channel is handled.At the region of Single Frequency Network intersection, at the control messages that is subjected to regional impact, reduce the emission frequency of intersection border, region honeycomb to it, adopt timesharing to send at interval, promptly send the control messages of a region in former frame, back one frame sends the control messages of another (adjacent) region, the addressing sign that increases the region in the message is to provide the receiving terminal system identification, as influential to terminal roaming, this interval sends the control channel message relevant with the region only at the border honeycomb, and honeycomb is not influenced by this network planning in the region, does not need timesharing to send at interval with the irrelevant control channel message in region in addition.
In described step G, to Single Frequency Network business (data) Channel Processing.At the region of Single Frequency Network intersection, at the business that areal variation is arranged (data) channel, what promptly this OFDM channel transmitted is regional service, can have two kinds of methods to realize the Single Frequency Network of the different services of different regions transmission:
Sacrifice border honeycomb method or isolation strip method, i.e. the service that only in the honeycomb of the border of region intersection, does not transmit areal variation,
Perhaps does not transmit both sides, and perhaps transmit a side region, and opposite side does not transmit, and so just forms natural isolation strip, makes the Single Frequency Network channel of different regions interference-free, and this method is sacrificed all or part of regional service at the region intersection;
Sacrifice the resource method, the areal variation service that is the both sides, region alternately transmits, it is the regionality service that former frame transmits a region, next frame transmits the regionality service of adjacent region, the shortcoming of this method is the waste resource, and for example two Lin Qu replace the regionality services of transmitting separately, need the air resource of twice like this, and causing the region internal network also is this transfer approach, so this method causes the Single Frequency Network system availability to reduce.
If Single Frequency Network is natural isolation strip at the region intersection, promptly the region intersection does not have the Single Frequency Network signal to cover, and perhaps the two does not intersect coverings, so whole Single Frequency Network system is not exerted an influence, and does not need this ad hoc network to plan.
Can adopt geographic isolation strip or two networks on different frequency range, to send the Single Frequency Network service at planning between Single Frequency Network, just not disturb between Single Frequency Network like this.Wherein the geographic isolation band is meant between Single Frequency Network that signal covers and do not have geographic overlappingly, does not disturb mutually; Be meant on the different frequency range that taking frequency spectrum resource differs greatly, as one be 700MHz, one is 750MHz.
Single Frequency Network need need reasonably planning to the regionality service at different regions intersection, reduces the differently channel disturbance between domain system, improves the service quality of Single Frequency Network.
Description of drawings
Fig. 1 is the Single Frequency Network system;
Fig. 2 is the frame planning based on time division way;
Fig. 3 is a network system internal loop test flow chart;
Fig. 4 is a transmitter delay process fundamental block diagram;
Fig. 5 is the classification of Single Frequency Network coverage planning;
Fig. 6 is an OFDM symbol time-domain diagram;
Fig. 7 is a Single Frequency Network control channel time division way planning chart;
Fig. 8 is for sacrificing (data) channel time division way planning chart of border honeycomb method;
Fig. 9 is for sacrificing (data) channel time division way planning chart of Internet resources method.
Specific embodiment
With reference to accompanying drawing 1, network side mainly is made up of network center's Control Node and transmitter in the Single Frequency Network system, network center's Control Node unification is to each transmitter transfer medium flow data, it is multiple that but the data transmission media between network center's Control Node and the transmitter can have, as wired, microwave, satellite etc.
Fig. 2 plans based on the time division way frame, promptly to based on time-division Single Frequency Network unified planning resource, in this frame, each channel comprises one or an above OFDM symbol, wherein, control channel 1 and 2 is not for being subjected to the control channel of regional impact, and all transmitters send identical control information at these two channels in the Single Frequency Network, and control channel 3 to n is the control channel that is subjected to regional impact; Traffic Channel 1 and 2 is not for being subjected to the regional impact Traffic Channel, and all transmitters send same service content in Traffic Channel 1 in the Single Frequency Network, and Traffic Channel 3 to n is also different in the service of different regions transmission for because of the different Traffic Channel in region.
Single Frequency Network system requirements different transmitters at one time, the same signal of same frequency emission, and be different by network center's Control Node unification to the time-delay that different transmitters transmits data, synchronous for aerial signal, must obtain the network system internal delay time.
A kind of network center shown in Figure 3 Control Node is to the go-and-return test method of delaying time between the transmitter, and flow process is as follows:
A. send a go-and-return test message at initial timer time to transmitter by network center's Control Node, comprise identifying code in this message;
B. after receiving this message, transmitter 1 just immediately this message is returned to network center's Control Node;
C. network center's Control Node just stops timing after receiving the message of returning, and whether the comparatively validate sign indicating number is consistent, and initial sum difference deadline is exactly two times of time-delays of this transmitter 1.
All transmitters are delayed time in the same procedure test Single Frequency Network, the length that compares delay time, with long delay in the Single Frequency Network is benchmark, other transmitters are by increasing the method for buffer memory, data to be launched temporarily are kept at this locality, and the time of importing with GPS is as the criterion, when having arrived the time that Single Frequency Network is launched these frame data, just from buffer memory, take out data, so just guaranteed the time consistency that the Single Frequency Network data send.The main modular that comprises at the delay process transmitter shown in Figure 4 is comprising the buffer memory part.
The transmitter classification of Single Frequency Network shown in Figure 5, both sides that transmitter B have a common boundary in the region respectively in the transmitter A of region 1 and the region 2 wherein, be border, region transmitter, and in the region transmitter C border transmitter B of 2 inside in same region and adjacent, so transmitter C is a transmitter in the region, the border honeycomb of border transmitter A is omnidirectional's honeycomb, and the border honeycomb of border transmitter B is 60 degree angle honeycombs, and mobile receiving terminal covers the reception service of going in the intersection of border transmitter A and B.
Fig. 6 forms the time of OFDM adjacent-symbol in time domain; comprise protection interval and effective time; protection main effect at interval is the anti-multipath expansion; the distance of OFDM Single Frequency Network transmitter is relevant at interval with protection; optimum distance between the Single Frequency Network transmitter is less than protection interval and aerial signal propagation velocity; otherwise produce interchannel interference and intersymbol interference in the intersection area of coverage, perhaps signal covers discontinuous.
Fig. 7 is the control channel time division way planning under Fig. 4 transmitter distribution situation, and wherein control channel 1 is irrelevant with the region in Single Frequency Network, and promptly no matter the aerial information that passes is identical in that region; And control channel 2 is relevant with the region in Single Frequency Network, promptly 1 content that transmits with 2 inner control channels 2 is different in the region, control channel 2 in the Cellular Networks of border is alternately to transmit in network frame, and control channel 1 is not limited by the region, no matter on the border, region or in inside, region; Honeycomb in the region also normally all transmits control channel in every frame, as in transmitter C.
Fig. 8 is respectively two kinds of business relevant with the region (data) channel time division way planing method with Fig. 9, wherein professional (data) channel 1 is irrelevant with the region in Single Frequency Network, no matter at the honeycomb on border, still honeycomb transmission content is identical in the region, and professional (data) channel 2 is relevant with the region in Single Frequency Network, and promptly the content that transmits in region 1 and 2 is different.Fig. 8 adopts sacrifice border honeycomb method that business (data) channel 2 in region 1 and the region 2 is isolated, the border honeycomb of professional (data) channel 2 in transmitter B do not send among the figure, but the normal transport service of the internal transmitter C in the region 2 (data) channel 2; Adopt sacrifice resource method to make alternately transport service (data) channel 2 of region 1 and region 2 among Fig. 9, internal transmitter C in the region 2 and border transmitter B adopt same transfer approach.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those skilled in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (4)
1, a kind of single frequency network planning method based on orthogonal frequency division multiplexi comprises the steps:
Steps A is carried out unified resource planning to Single Frequency Network;
Step B provides the region of service to carry out unified addressing to Single Frequency Network, makes adjacent region that the different network addresss be arranged;
Step C carries out synchronously the Single Frequency Network aerial signal;
Step D classifies to transmitter in the Single Frequency Network and honeycomb;
Step e is determined optimum distance between the interior transmitter of described Single Frequency Network;
Step F is handled the Single Frequency Network control channel relevant with the region;
Step G handles the Single Frequency Network Traffic Channel relevant with the region;
Wherein, steps A comprises the steps:
Steps A 1 is divided into control channel that is subjected to regional impact and the control channel that is not subjected to regional impact with the control channel of Single Frequency Network;
Steps A 2 is divided into Traffic Channel that is subjected to regional impact and the Traffic Channel that is not subjected to regional impact with the Traffic Channel of Single Frequency Network;
All transmitters send identical control information at the control channel that is not subjected to regional impact in the steps A 3, Single Frequency Network;
All transmitters are being subjected to the control channel of regional impact in the steps A 4, Single Frequency Network, send control information inequality;
All transmitters send identical business information in the Traffic Channel that is not subjected to regional impact in the steps A 5, Single Frequency Network;
All transmitters are being subjected to the Traffic Channel of regional impact in the steps A 6, Single Frequency Network, send business information inequality;
Wherein, step B divides by the service that Single Frequency Network provides described region, and the service that identical air traffic channel resource transmits in different regions in the Single Frequency Network is different;
Wherein, step C is specially:
Step C1 obtains Single Frequency Network internal system maximum delay;
Step C2 is a benchmark with the transmitter of maximum delay in the Single Frequency Network, and other transmitters temporarily are kept at this locality by increasing the method for buffer memory with data to be launched;
Step C3, the time of importing with global positioning system is as the criterion, and when having arrived the time that Single Frequency Network is launched these frame data, just takes out data from buffer memory;
Wherein, transmitter and the honeycomb in the Single Frequency Network is divided into transmitter and border, region transmitter in the region, honeycomb and border, region honeycomb in the region among the step D;
Wherein, the optimum distance between the transmitter described in the step e multiply by the product of aerial signal propagation rate blanking time less than protection in the OFDM parameter;
Wherein, step F is specially:
Step F 1 at the region of Single Frequency Network intersection, at the control messages that is subjected to regional impact, reduces the emission frequency of border, intersection region, region honeycomb to control information;
Step F 2, border, region honeycomb adopt timesharing to transmit control message at interval;
Wherein, step G is specially: adopt sacrifice border honeycomb method or isolation strip method to realize the Single Frequency Network of the different services of different regions transmission, perhaps adopt sacrifice resource method to realize the Single Frequency Network of the different services of different regions transmission.
2, the single frequency network planning method based on orthogonal frequency division multiplexi according to claim 1 is characterized in that step C1 is specially:
Step C11, network center's Control Node sends a go-and-return test message at initial timer time to transmitter, comprises identifying code in this message;
Step C12 just returns to network center's Control Node with this message immediately after transmitter is received this message described in the step C11;
Step C13, network center's Control Node just stop timing after receiving the message of returning, and whether the comparatively validate sign indicating number is consistent, and initial sum difference deadline is exactly the twice of the time-delay of transmitter described in the step C11.
3, the single frequency network planning method based on orthogonal frequency division multiplexi according to claim 1 is characterized in that, step F 2 is specially:
Border, region honeycomb is in the control messages of a region of former frame transmission, and back one frame sends the control messages of another region, and the addressing sign that increases the region in the message is to provide the receiving terminal system identification.
4, the single frequency network planning method based on orthogonal frequency division multiplexi according to claim 1, it is characterized in that, described sacrifice border honeycomb method or isolation strip method are the service that does not transmit areal variation in the honeycomb of the border, region of at least one side of region intersection; Described sacrifice resource method is that the areal variation service is alternately transmitted in the both sides, region, and promptly former frame transmits the regionality service of a region, and next frame transmits the regionality service of adjacent region.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101093174A CN100551111C (en) | 2006-08-08 | 2006-08-08 | Single frequency network planning method based on orthogonal frequency division multiplexi |
| PCT/CN2006/003782 WO2008019542A1 (en) | 2006-08-08 | 2006-12-30 | A method for laying out sfn based on ofdm technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101093174A CN100551111C (en) | 2006-08-08 | 2006-08-08 | Single frequency network planning method based on orthogonal frequency division multiplexi |
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| CN100551111C true CN100551111C (en) | 2009-10-14 |
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| WO (1) | WO2008019542A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8229441B2 (en) * | 2007-08-24 | 2012-07-24 | Avaya Inc. | Graduated single frequency network |
| CN102387508B (en) * | 2011-11-01 | 2019-05-24 | 中兴通讯股份有限公司 | The method and apparatus of carrier wave polymerization in a kind of lte-a system |
| CN109981514B (en) * | 2019-02-19 | 2021-11-19 | 重庆邮电大学 | Local area network-based cell DMB single frequency network implementation method |
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| US6956814B1 (en) * | 2000-02-29 | 2005-10-18 | Worldspace Corporation | Method and apparatus for mobile platform reception and synchronization in direct digital satellite broadcast system |
| KR100933155B1 (en) * | 2002-09-30 | 2009-12-21 | 삼성전자주식회사 | Device and Method for Allocating Virtual Cells in Frequency Division Multiple Access Mobile Communication System |
| WO2006069826A1 (en) * | 2004-12-23 | 2006-07-06 | France Telecom | Method for transmitting multicarrier signals in a planned macro-diversity multicellular network, corresponding network, signal, reception method and device |
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| CN101123781A (en) | 2008-02-13 |
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