CN101335977B - Method, system and device for transmitting ranging signal in OFDM system - Google Patents
Method, system and device for transmitting ranging signal in OFDM system Download PDFInfo
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- CN101335977B CN101335977B CN2007101094805A CN200710109480A CN101335977B CN 101335977 B CN101335977 B CN 101335977B CN 2007101094805 A CN2007101094805 A CN 2007101094805A CN 200710109480 A CN200710109480 A CN 200710109480A CN 101335977 B CN101335977 B CN 101335977B
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Abstract
An embodiment of the present invention discloses a method of range signal transmission in an orthogonal frequency division multiplexing system, comprising that: a district of a base station includes at least two areas, and each area is provided with a distance range channel time resource block in an upstream sub-frame section, and guard time is obligated in each distance range channel time resource block. A terminal determines oneself area according to the receiving intensity of the current signal, transmits the range signal to the base station through the time resource beside the guard time in the range channel time resource block distributed for the terminal area. The embodiment of the invention also discloses a system of range signal transmission, a base station and a terminal in the orthogonal frequency division multiplexing system. According to the method of range signal transmission in an orthogonal frequency division multiplexing system provided by the present invention, reverse access of the terminal in different area is flexibly supported.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to the method, system and device that distance measuring signal sends in a kind of ofdm system.
Background technology
Micro-wave access to global intercommunication (WiMAX) technology belongs to new generation broadband wireless metropolitan area network (WMAN) technology, refers in particular to the wireless access wide band technology based on IEEE802.16 series wideband wireless standard.Wherein 802.16d is the standard that is applicable to that fixed broadband wireless inserts, and 802.16e then is to use in the broadband wireless access standard of supporting mobility, and its frame structure as shown in Figure 1.802.16e physical layer adopts OFDM (OFDMA) technology, can adopt MIMO simultaneously, the antenna technology that AAS etc. are advanced obtains higher frequency utilization efficient.
Traditional multicarrier modulation system is that high-speed data-flow is formed the data flow of a plurality of low speed by serial to parallel conversion, and then modulates corresponding carrier wave respectively, thereby constitutes the parallel transmission system that sends of a plurality of low-rate datas.Wherein a plurality of carrier waves that are used to modulate show as a plurality of nonoverlapping subcarriers on frequency band.The OFDM technology is a kind of special multi-carrier modulation technology, have between each subcarrier 1/2 overlapping, but keep mutually orthogonal, receiving terminal can by the correlation demodulation technical point from, constitute data transmission system more efficiently.The OFDM technology can improve spectrum efficiency greatly, utilizes the DSP hardware of Fourier transform (FFT) and inversefouriertransform (IFFT) to realize simultaneously, can simplify the realization of ofdm system greatly.Ofdm system can also reduce intersymbol interference in addition, makes full use of frequency selectivity.Because the plurality of advantages of OFDM technology is so the OFDM technology is widely used at present.The OFDMA system utilizes the OFDM technology to do multiplex technique, promptly by distributing different data subcarriers to distinguish different users to different user.Because transfer of data is used different mutually orthogonal subcarriers between the user, so transfer of data can the phase mutual interference between the user.And when subcarrier is distributed, can take into full account this user's wireless environment situation, make full use of frequency selectivity, distribute the data subcarrier of the most suitable transmission to the user, by the allocation schedule optimization Algorithm, can be so that power system capacity improves.
Range finding (Ranging) technology is meant that portable terminal (MS) is linked into base station (BS), in fact the process that BS carries out reverse or up adjustment to transmission time/through-put power/transmission frequency of MS, the process of ranging are exactly oppositely to insert the process of (reverse access).The purpose that BS oppositely adjusts MS is to keep synchronously, and adopt suitable transmitting power for the transmission time that guarantees MS, transmission frequency.In the OFDMA system, if asynchronism(-nization) step/frequency is asynchronous, will cause serious disturbance, influence systematic function.So all strict time synchronized/Frequency Synchronization in the OFDMA system needs BS that transmission time/transmission frequency of MS is adjusted.Simultaneously, also need BS that the transmitting power of MS is adjusted, prevent that MS from using too big transmitting power to cause interference, perhaps MS uses too little transmitting power to cause BS not receive.And in the MS connecting system, because the residing environment of MS is unknown, the MS that has is near apart from BS, the MS that has is far away apart from BS, and the MS that has is just in high-speed mobile, and the MS that has remains static or the like, so at each different MS, when BS carries out ranging at each MS, all must carry out the reverse transfer time and adjust, guarantee that each MS's oppositely transmits a signal to the time synchronized that reaches BS each MS; BS also must adjust the emission frequency deviation of each MS, guarantees that the transmission frequency of each MS keeps orthogonality; BS can also adjust the transmitting power of each MS.
In the prior art, as shown in Figure 2, the Ranging process in the OFDMA system is as follows:
Step 201:BS is at the interval Ranging channel resource that distributes of sub-frame of uplink, the Ranging channel resource that distributes is a temporal frequency Resource Block in the sub-frame of uplink, be the Ranging channel resource block assignment transmission opportunity size of distributing, and reservation guard time, this transmission opportunity size is a temporal frequency resource block size, and is always big or small less than the Ranging channel resource block;
Step 202:BS sends the message that carries uplink map (UL-MAP) to MS, include the Ranging channel resource information that the rapid middle BS of previous step distributes among the UL-MAP, comprise that this Ranging channel resource block reaches the transmission opportunity size and the guard time of reserving for its assignment in the position in sub-frame of uplink interval;
Step 203:MS utilizes the resource of transmission opportunity size in the described Ranging channel resource block, sends the Ranging signal that includes the Ranging sign indicating number to BS, and this Ranging sign indicating number is used for identifying MS oneself;
Step 204:BS receives that MS sends receive the Ranging signal to the ranging channel resource after, and according to certain matching algorithm (such as by the frequency domain related algorithm), if can detect the Ranging signal that certain MS sends, BS will send down detected Ranging sign indicating number by forward direction or down channel so, send the Ranging success response according to the Ranging sign indicating number in this signal to MS, and by forward channel carry to this MS with time/frequency/power adjustment information, the MS that used this Ranging sign indicating number to carry out Ranging originally detects the forward direction information that BS sends, can know that then BS has detected the Ranging signal that oneself sends, so just time/frequency/power the adjustment information that need send according to BS sends to MS to the adjustment that oneself time/frequency/power carries out correspondence.
Such as; referring to Fig. 3; be the Ranging channel resource block of BS in the interval distribution of a sub-frame of uplink; this Resource Block comprises 12 transmission opportunitys; each transmission opportunity big or small identical; guard time (Empty) zone is the not occupied zone of blank as setting aside some time the zone, is used for preventing that the Ranging signal from disturbing next transfer of data constantly.N1 is the time span of transmission opportunity, can select 2 OFDMA symbols (symbol) or 4 OFDMA symbols, N2 is the frequency size of transmission opportunity, is typically chosen in 6 subchannels, and this Resource Block of N1 * N2 has just been represented a transmission opportunity size like this.
In realizing process of the present invention, the inventor finds to exist at least in the prior art following technical problem:
Existing systems is when distributing the Ranging channel resource; all users distribute transmission opportunity size and guard time unitedly for the sub-district; but in real system; the user of sub-district zones of different is different to the demand of guard time; for the near Cell Center User of distance BS; channel condition is good; transmission delay is little; only need less guard time just can prevent that the Ranging signal from disturbing next transfer of data constantly; and for distance BS Cell Edge User far away; because it is big to send the time delay of Ranging signal, need bigger guard time can prevent that just the Ranging signal from disturbing next transfer of data constantly.The method of unified distribution Ranging channel resource in the existing system; lack flexibility; can not satisfy the demand of the different guard times of user's needs of sub-district zones of different; for some regional user; Cell Edge User for example, because the guard time setting falls short of, the Ranging signal of transmission may be deferred to constantly next; next transfer of data is constantly caused interference, user's normal access is affected.
Summary of the invention
The embodiment of the invention provides the method, system and device that distance measuring signal sends in a kind of ofdm system, is used for solving prior art Ranging channel resource allocation mechanism and lacks flexibility, makes user's the affected problem of normal access.
The embodiment of the invention provides the method that distance measuring signal sends in a kind of ofdm system, and the sub-district of base station comprises at least two zones in the system, and this method comprises:
In the sub-frame of uplink interval is described each region allocation range channel time resource piece, and reserves guard time in each range channel time resource piece;
Terminal is determined self region according to the current demand signal receiving intensity, is utilized as in the range channel time resource piece that distributes described terminal region the time resource except that guard time to described base station transmission distance measuring signal.
The embodiment of the invention provides the system that distance measuring signal sends in a kind of ofdm system, and this system comprises:
Coverage cell comprises the base station at least two zones, and being used for interval at sub-frame of uplink is described each region allocation range channel time resource piece, and reserves guard time in each range channel time resource piece;
Terminal is used for determining self region according to the current demand signal receiving intensity, utilize described base station be in the range channel time resource piece that distributes of described terminal region the time resource except that guard time to described base station transmission distance measuring signal.
The embodiment of the invention provides a kind of base station, and this base station comprises:
Allocation units, being used for interval at sub-frame of uplink is described each region allocation range channel time resource piece;
Reserve the unit; be used for reserving guard time at described each range channel time resource piece; terminal is determined self region according to the current demand signal receiving intensity, is utilized as in the range channel time resource piece that distributes described terminal region the time resource except that guard time to described base station transmission distance measuring signal.
The embodiment of the invention provides a kind of terminal, and this terminal comprises:
Determining unit is used for determining self region according to the current demand signal receiving intensity;
Transmitting element, being used for utilizing the base station is the time resource of range channel time resource piece except that guard time of described region allocation, sends distance measuring signal to described base station.
As seen, in the embodiment of the invention, for distributing range channel time resource piece respectively in each zone of base station cell, and in each range channel time resource piece, reserve guard time respectively; After terminal is determined self region, be utilized as that the time resource except that guard time sends distance measuring signal in the range channel time resource piece of this region allocation.By this method, can prevent effectively that distance measuring signal to next influence of transfer of data constantly, making normally connecting system of user at sub-district zones of different flexible allocation range channel time resource piece.
Description of drawings
Fig. 1 is a frame structure schematic diagram in the prior art;
Fig. 2 is the flow chart that terminal oppositely inserts in the prior art;
Fig. 3 is the Ranging channel resource schematic diagram of base station assigns in the prior art;
The method flow diagram that Fig. 4 provides for the embodiment of the invention;
Fig. 5 is the Ranging channel resource schematic diagram that distributes in the embodiment of the invention one;
Fig. 6 is the Ranging channel resource schematic diagram that distributes in the embodiment of the invention two;
The system construction drawing that Fig. 7 provides for the embodiment of the invention;
The architecture of base station figure that Fig. 8 provides for the embodiment of the invention;
The terminal structure figure that Fig. 9 provides for the embodiment of the invention.
Embodiment
Referring to Fig. 4, the method that the Ranging signal sends in a kind of OFDMA system that the embodiment of the invention provides may further comprise the steps:
Step 401: in the sub-frame of uplink interval is each region allocation range channel Resource Block of base station cell, reserves guard time in the range channel Resource Block of each distribution, and sets the transmission opportunity size for each range channel Resource Block stays;
Here, the sub-district of base station can comprise one or more zones, for example central area and fringe region.The transmission opportunity size is a time size, for example 4 OFDMA symbols.
Step 402: terminal is determined self region according to the current demand signal receiving intensity, is utilized as time resource except that guard time, its transmission opportunity size in the range channel Resource Block of this region allocation, sends the Ranging signal to the base station;
Step 403: when the base station receives the Ranging signal that terminal sends, send the Ranging success response, and time/frequency/power adjustment information is sent to this terminal by forward channel to this terminal.
The implementation of step 401 mainly contains two kinds, is specifically described below:
First kind, the base station is distributed the Ranging channel resource block in the sub-frame of uplink interval respectively for the zones of different of sub-district, reserves guard time in the Ranging of each distribution channel resource block, and is that each Ranging channel resource block is set a transmission opportunity size.Certainly, a plurality of Ranging channel resource blocks that distributed here are nonoverlapping.
Here, specifically reserve how many resources and depend on path delay and the length of OFDM symbol itself and the trading off of power that cell coverage area causes (Empty) time as protection, BS can be provided with the value an of the best according to certain calculating and balance.Such as the sub-district that for a coverage is 50 kilometers; be every kilometer of 6.67 microsecond path delay, so under the extreme case, maximum path is 333.5 microseconds; suppose that an OFDM symbol is 102.8 microseconds, then need to reserve 4 OFDM symbols as can be seen at least as guard time.Need to reserve what OFDM symbols and then also depend on the mode that signal sends as the transmission opportunity size, promptly on earth by repeating or expanding transmission, and the degree decision that can reduce of the gain that brings thus and power, can obtain by certain emulation.Zui You solution is the distance according to each MS actual range BS as can be seen, calculate path delay, carry out optimal Rnging channel allocation then, but in real system, BS does not also know which MS need initiate Ranging, BS also can not accurately measure the distance of each MS simultaneously, so BS can not accomplish to carry out optimum allocation at each MS, so BS can only distribute at typical situation, such as all users are divided into 2 classes, a class is the user of center of housing estate, and another kind of is the user of cell edge, carry out the Ranging channel resource allocation respectively at this 2 class user, as long as guarantee that most user can satisfy performance requirement.
Such as, the base station is interval for Cell Center User distributes Ranging channel resource block 0 at sub-frame of uplink, and is transmission opportunity size of this channel resource block setting; Specify Ranging channel resource block 1 at Cell Edge User, and be transmission opportunity size of this channel resource block setting.Because Cell Center User is near apart from BS, channel condition is good, and Cell Edge User is far away apart from BS, bad channel conditions, can set the transmission opportunity size of the transmission opportunity size of Ranging channel resource block 1 greater than Ranging channel resource block 0, for example, the transmission opportunity of setting Ranging channel resource block 1 takies 4 OFDMA symbols, the transmission opportunity of Ranging channel resource block 0 takies 2 OFDMA symbols, as shown in Figure 5.Simultaneously; because the transmission path delay of Cell Center User is less; the transmission path delay of Cell Edge User is bigger; in order to guarantee that the Ranging signal that these users send does not influence next transfer of data constantly; in Ranging channel resource block 0, reserve less protection (Empty) time; in Ranging channel resource block 1, then need to reserve bigger guard time, as protection (Empty) zone of Ranging channel resource block 0 among Fig. 5 and Ranging channel resource block 1.
Second kind, at Ranging channel resource block of the interval distribution of sub-frame of uplink, this Resource Block is divided into a plurality of parts, be respectively applied for the user of sub-district zones of different; In each part, reserve guard time, and be each part setting transmission opportunity size.
Such as, the base station is at Ranging channel resource block of the interval distribution of sub-frame of uplink, the first half of the shared resource of this Ranging channel resource block is used for Cell Center User, latter half is used for Cell Edge User, and set a transmission opportunity size respectively for these two parts, the transmission opportunity size that is used for Cell Center User is less than the transmission opportunity size that is used for Cell Edge User, for example, the transmission opportunity that setting is used for Cell Center User takies 2 OFDMA symbols, and the transmission opportunity that is used for Cell Edge User takies 5 OFDMA symbols.Simultaneously; in the first half Resource Block, reserve less guard time; and in the latter half Resource Block, reserve bigger guard time; as shown in Figure 6; transmission opportunity 0-5 among the figure in the Ranging channel resource block 0; be used for Cell Center User, transmission opportunity 6-7 is used for Cell Edge User, the Empty zone of the Empty zone behind the transmission opportunity 6-7 after greater than transmission opportunity 0-5.
In the second approach, concrete guard time is reserved much resources, and sets great transmission opportunity size, and its strategy is considered same first method.
Need to prove, above-mentioned two kinds of methods of salary distribution can separately be used, use also can combine, combine to use and be meant that the base station is when the interval Ranging of distribution of sub-frame of uplink channel resource, distribute a plurality of Ranging channel resource blocks, can be used for the user of zones of different to certain Ranging channel resource block.Simultaneously, the division of cell area not only can be divided into center and peripheral, can also otherwise divide, and for example microzonation is divided into ring 1 zone, ring 2 zones, ring 3 zones etc.
The base station is at reasonable time in the step 401; the Ranging channel resource information of distributing is sent to terminal, and Ranging channel resource information comprises that each Ranging channel resource block of distribution is in sub-frame of uplink interval shared resource information, the transmission opportunity size information of setting and the guard time information of reservation.
Such as; for Fig. 5; the base station can be with Ranging channel resource block 0 shared resource information, transmission opportunity size information, guard time information, and Ranging channel resource block 1 shared resource information, transmission opportunity size information, guard time information send to terminal.For Fig. 6, the base station can be with Ranging channel resource block 0 shared resource information, division information and for each divides transmission opportunity size information that part sets and the guard time information of reservation sends to terminal.
Here, the shared resource information of Ranging channel resource block can comprise that the original position of this Ranging channel resource block in the sub-frame of uplink interval (comprises the time, the frequency band original position), time span (can represent) with the number of OFDMA symbols, frequency bandwidth (can represent) with the number of subchannel, work as original position, after time span and frequency bandwidth are given, the user just can be according to the unique definite Ranging channel resource block of these three parameters in the position in sub-frame of uplink interval, and then utilizes the resource of determining the transmission opportunity size in the Ranging channel resource block to send the Ranging signal.
The base station can be loaded in Ranging channel resource information and transmission opportunity size information among the UL-MAP, and sends to terminal.
Terminal is determined self region according to the current demand signal receiving intensity in the step 402, is utilized as in the range channel Resource Block of this region allocation except that guard time, the time resource of its transmission opportunity size is as follows to the concrete grammar that the base station sends the Ranging signal:
Terminal is determined self region according to the current demand signal receiving intensity; according to self region in a plurality of Ranging channel resource blocks of base station assigns, selecting a Ranging channel resource block; determine the transmission opportunity size and the guard time of this Ranging channel resource block correspondence, utilize in the selected Ranging channel resource block resource except guard time, its transmission opportunity size to send the Ranging signal to the base station.Such as; for Fig. 5; comprise two Ranging channel resource blocks in the Ranging channel resource information that terminal receives: Ranging channel resource block 0 and Ranging channel resource block 1; wherein, the transmission opportunity of Ranging channel resource block 0 correspondence takies 2 OFDMA symbols, and the protection zone is little; be used for Cell Center User; the transmission opportunity of Ranging channel resource block 1 correspondence takies 4 OFDMAsymbols, and the protection zone is big, is used for Cell Edge User.If the user detects from as central user, then select Ranging channel resource block 0, and utilize the time span of 2 OFDMAsymbols in the Ranging channel resource block 0 to send the Ranging signal.If the user detects from as edge customer, then select Ranging channel resource block 1, and utilize the time span of 4 OFDMAsymbols in the Ranging channel resource block 1 to send the Ranging signal.Be not used for sending any signal in the protection zone.
Perhaps; terminal is determined self region according to the current demand signal receiving intensity; determine to be the part of this zone user's appointment in the Ranging channel resource block of base station assigns, and utilize that resource except guard time, its transmission opportunity size sends the Ranging signal to the base station in this part Resource Block.Such as, for Fig. 6, include only Ranging channel resource block 0 in the Ranging channel resource information that the user receives, Ranging channel 0 Resource Block is divided into two parts: first half is used for Cell Center User, take 2 OFDMA symbols, latter half is used for Cell Edge User, takies 5 OFDMA symbols.If the user detects from as central user, then utilize the time span of 2 OFDMA symbols in the first half to send the Ranging signal; If the user detects from as edge customer, then utilize the time span of 5 OFDMA symbols in the latter half to send the Ranging signal.
Terminal is according to the distance of current received signal intensity detection apart from BS, determines that promptly the method for self region can be as follows:
The signal that the base station will comprise the signal strength threshold value sends to terminal, the forward signal intensity that terminal receives according to oneself and this signal strength threshold value compare, thereby judge self distance apart from BS, such as, when the signal that receives comprises a signal strength threshold value, if comparative result is lower than this threshold value for received signal intensity, then can judge certainly as Cell Edge User, bad channel quality, if comparative result is this threshold value of received signal intensity height, can judge that then oneself is good as Cell Center User, channel quality.For another example, when the signal of reception comprises two signal strength threshold values that vary in size,, then can judge self to be positioned at sub-district ring 3 if comparative result is lower than less threshold value for received signal intensity; If comparative result be received signal intensity between two threshold values, then can judge self to be positioned at sub-district ring 2; If comparative result be received signal intensity greater than bigger threshold value, then can judge self to be positioned at sub-district ring 1;
The user can also judge the position at self place in conjunction with detected a plurality of neighbor cell signals, if the user can detect the forward signal of a plurality of sub-districts, and signal strength signal intensity also is more or less the same, the user also can think the edge that self is in sub-district to be accessed so, if the user can detect the forward signal of a plurality of sub-districts, but the forward signal intensity maximum of having only sub-district to be accessed, and much larger than the forward signal of other sub-districts, then the user then can think the center that lays oneself open to sub-district to be accessed.
The user sends the Ranging signal and can adopt the mode of expansion or repetition to send, and the acquisition time gain is come by diversity reception in the base station.So-called extended mode is meant that the time resource of CU transmission opportunity only sends the Ranging signal one time, but the Ranging signal that is sent is expanded in time; So-called repetitive mode is meant that the time resource of CU transmission opportunity sends repeatedly identical Ranging signal continuously.Concrete which kind of mode that adopts can be specified by the base station, and concrete grammar is:
The base station sends the command signal that comprises send mode by forward channel to the user, and the indicating cell user still sends the Ranging signal in the mode that repeats in the mode of expansion, and the user then decides send mode according to this indication information.
Certainly, adopt which kind of mode to send the Ranging signal, also can preestablish in terminal, terminal can be set according to this and select send mode, base station to need 2 kinds of possibilities of blind Detecting at this moment.
The mode that adopts expansion or repeat sends the Ranging signal, increased time diversity gain (TimeDiversity), can suitably save user's transmitting power, because the Ranging channel is based on the mode of competition and sends, can reduce the interference of power minimizing so to other users, simultaneously can also improve the receptivity of base station to the Ranging signal, these advantages are especially obvious for Cell Edge User.
In the step 403, BS receives the Ranging signal to the Ranging channel resource, and according to certain matching algorithm (such as by the frequency domain related algorithm), if can detect the Ranging signal that MS sends, BS will send down detected Ranging sign indicating number by forward direction or down channel so, and carry time/frequency/power adjustment information to this MS, use this Ranging sign indicating number to carry out MS originally and detected the forward direction information that BS sends, by the Ranging sign indicating number information of carrying in the forward direction information, can know that then BS has detected the Ranging signal that oneself sends, so just need carry out the adjustment of correspondence to own time/frequency/power according to time/frequency/power adjustment information that BS sends, thereby reach the time synchronized/Frequency Synchronization with system, and use the best power emission.
Referring to Fig. 7, the embodiment of the invention also provides the system that distance measuring signal sends in a kind of ofdm system, and this system comprises:
Coverage cell comprises the base station 701 at least two zones, and being used for interval at sub-frame of uplink is each region allocation range channel time resource piece, and reserves guard time in each range channel time resource piece;
Terminal 702 is used for determining self region according to the current demand signal receiving intensity, and utilizing the base station is that the time resource except that its guard time sends distance measuring signal to the base station in the range channel time resource piece of this region allocation.
Referring to Fig. 8, the base station that the embodiment of the invention provides comprises: allocation units 801, and being used for interval at sub-frame of uplink is described each region allocation range channel time resource piece; Reserve unit 802, be used for reserving guard time at described each range channel time resource piece; Setup unit 803 is used to described each range channel time resource piece to set the transmission opportunity size, and this transmission opportunity size is the time size; Transmitting element 804, the transmission opportunity size information that is used for the range channel Resource Block information that allocation units are distributed, the guard time information of reserving the unit reservation, setup unit setting sends to terminal; Receiving element 805 is used for the distance measuring signal that receiving terminal is sent, and sends the Ranging success response to this terminal, and by forward channel time/frequency/power adjustment information is sent to this terminal.
Reserving unit 802 comprises: unit 8021 is reserved at the center, and the range channel time resource piece that is used for distributing in described central dispense unit is reserved guard time; Unit 8022 is reserved at the edge, is used for reserving guard time at the range channel time resource piece that described edge allocation units distribute, and this guard time is reserved the guard time that the unit is reserved greater than the center.
This base station further comprises: indicating member 806 is used for sending the signal that comprises the signal strength threshold value to terminal; Thresholding unit 807 is used for sending the command signal that comprises send mode to terminal.
Receiving element can obtain receiving gain by the diversity reception distance measuring signal.Reserve the unit and reserve great guard time, reach setup unit and set great transmission opportunity size, it considers that strategy with the method part, repeats no more here.
The workflow of the base station that the embodiment of the invention is provided describes below:
Step S01: the allocation units in the base station are each region allocation range channel Resource Block of sub-district;
Wherein, the central dispense unit is a center of housing estate region allocation range channel Resource Block in the sub-frame of uplink interval; The edge allocation units are that cell edge region is distributed the range channel Resource Block in the sub-frame of uplink interval;
Step S02: guard time is reserved in the reservation unit in the base station in each range channel Resource Block that allocation units distribute, and setup unit is that each range channel Resource Block that allocation units distribute is set the transmission opportunity size;
Wherein, the center is reserved the unit and reserve guard time in the range channel Resource Block that the central dispense unit distributes; The edge allocation units are reserved bigger guard time in the range channel Resource Block that the edge allocation units distribute.Simultaneously, the center setup unit is set the transmission opportunity size for the range channel Resource Block that the central dispense unit distributes; The edge setup unit is set bigger transmission opportunity size for the range channel Resource Block that the edge allocation units distribute;
Step S03: the transmission opportunity size information that the range channel resource information that the transmitting element in the base station distributes allocation units, the guard time information of reserving the unit reservation, setup unit are set sends to terminal;
Step S04: the distance measuring signal that the receiving element receiving terminal in the base station is sent sends the Ranging success response to this terminal, and by forward channel time/frequency/power adjustment information is sent to this terminal.
Referring to Fig. 9, the terminal that the embodiment of the invention provides comprises: receiving element 901 is used to receive range channel Resource Block information, guard time, the transmission opportunity size information sent the base station; Determining unit 902 is used for determining self region according to the current demand signal receiving intensity; Transmitting element 903, being used for utilizing the base station is that the range channel time resource piece time resource except that its guard time, its transmission opportunity size of described region allocation sends distance measuring signal to described base station.
This terminal further comprises: first receiving element 904: be used to receive the signal that comprises the signal strength threshold value that send the base station; Then described determining unit is used for: by received signal intensity and described signal strength threshold value are compared to determine self region.
This terminal further comprises: second receiving element 905 is used to receive the command signal that comprises send mode that send the base station; Then described transmitting element is used for: the send mode according to described command signal sends distance measuring signal to the base station.
Described send mode comprises: extended mode or repetitive mode, described extended mode is meant that the time resource that utilizes the transmission opportunity size sends a distance measuring signal to the base station, and described repetitive mode is meant that the time resource that utilizes the transmission opportunity size sends at least twice distance measuring signal continuously to the base station.
The workflow of the terminal that the embodiment of the invention is provided describes below:
Step S11: the receiving element of terminal receives range channel Resource Block information, guard time, the transmission opportunity size information that send the base station;
Step S12: terminal order unit is really determined self region according to the current demand signal receiving intensity;
Here, determine that specifically method is: first receiving element of terminal receives the signal that comprises the signal strength threshold value that send the base station, and determining unit is by comparing to determine self region with received signal intensity and described signal strength threshold value.
Step S13: it is that time resource except that its guard time, its transmission opportunity size sends distance measuring signal to the base station in the range channel time resource piece of described region allocation that the transmitting element in the terminal utilizes the base station.
Here, second receiving element of terminal receives the command signal that comprises send mode that send the base station, and transmitting element then sends distance measuring signal according to the send mode in the described command signal to the base station.
To sum up, beneficial effect of the present invention is:
In the embodiment of the invention; can distribute the Ranging channel resource flexibly at different zone, sub-district; comprise transmission opportunity size and protection zone size are set flexibly; make that the user can be according to self region; in the Ranging channel resource block that is its distribution, send the Ranging signal to the base station; not only reasonable use resource; zones of different user's different demands have also been satisfied; avoided the Ranging signal to next interference of transfer of data constantly, made normally connecting system of user.
Simultaneously, the user can adopt the mode of expansion or repetition to send the Ranging signal in the embodiment of the invention, increased time diversity gain (Time Diversity), can suitably save user's transmitting power, minimizing is to other users' interference, simultaneously can also improve the receptivity of base station to the Ranging signal, these advantages are especially obvious for Cell Edge User.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (27)
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| CN2007101094805A CN101335977B (en) | 2007-06-26 | 2007-06-26 | Method, system and device for transmitting ranging signal in OFDM system |
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| CN2007101094805A CN101335977B (en) | 2007-06-26 | 2007-06-26 | Method, system and device for transmitting ranging signal in OFDM system |
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| CN101815342B (en) * | 2009-02-25 | 2012-05-23 | 北京信威通信技术股份有限公司 | Method and device for ranging in wireless communication system |
| CN102075210B (en) * | 2009-11-20 | 2014-04-23 | 中兴通讯股份有限公司 | Method and base station for detecting distance between mobile stations in orthogonal frequency division multiplexing access (OFDMA) system |
| CN102469614B (en) * | 2010-11-03 | 2016-01-20 | 中兴通讯股份有限公司 | A kind of method for network access, control station and equipment |
| US9088455B2 (en) * | 2012-12-20 | 2015-07-21 | Broadcom Corporation | OFDM or OFDMA signaling for ranging and data |
| CN103560991B (en) * | 2013-10-18 | 2016-08-17 | 北京航空航天大学 | The method being applicable to OFDM receiver suppression rangefinder impulse disturbances |
| JP6616584B2 (en) * | 2015-04-09 | 2019-12-04 | ルネサスエレクトロニクス株式会社 | Semiconductor device |
Citations (2)
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|---|---|---|---|---|
| CN1192300A (en) * | 1995-06-05 | 1998-09-02 | 全点有限公司 | Timing adjustment control for efficient time division duplex communication |
| CN1846390A (en) * | 2003-07-03 | 2006-10-11 | 纳夫科姆技术公司 | Two-way ranging system and method for local positioning |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1192300A (en) * | 1995-06-05 | 1998-09-02 | 全点有限公司 | Timing adjustment control for efficient time division duplex communication |
| CN1846390A (en) * | 2003-07-03 | 2006-10-11 | 纳夫科姆技术公司 | Two-way ranging system and method for local positioning |
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