CN101128004A - Detection method, terminal and network device for random access - Google Patents

Detection method, terminal and network device for random access Download PDF

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Publication number
CN101128004A
CN101128004A CNA200610115131XA CN200610115131A CN101128004A CN 101128004 A CN101128004 A CN 101128004A CN A200610115131X A CNA200610115131X A CN A200610115131XA CN 200610115131 A CN200610115131 A CN 200610115131A CN 101128004 A CN101128004 A CN 101128004A
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signature sequence
ofdm
random
described signature
sequence
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CN101128004B (en
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李斌
阮卫
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Yan June
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Huawei Technologies Co Ltd
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Priority to CN200610115131XA priority Critical patent/CN101128004B/en
Priority to PCT/CN2007/070506 priority patent/WO2008022598A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]

Abstract

The utility model discloses a network side device, a terminal and a detection method of random access which greatly reduces the calculation amount during the random access of network side detection and simplifies the relevant devices, belonging to the wireless communication field. The utility model is characterized in that detecting signature sequences in time domain becomes possible through sending OFDM signals comprising signature sequences in full bandwidth. The utility model can send signature sequences on continuous sub-carriers and detect through the method related to direct time-domain; and can also send signature sequences on sub-carriers with equal interval and detect through the method related to time-domain difference; the utility model can occupy an additional subsequent OFDM sign as the reserved protective time after the OFDM signs carrying the signature sequences are sent completely, and does not carry data; and can also defer a plurality of OFDM signs randomly before the OFDM signs carrying the signature sequences are sent completely.

Description

The detection method of Jie Ruing, terminal and network equipment at random
Technical field
The present invention relates to wireless communication field, particularly based on the detection technique that inserts at random in the system of OFDM.
Background technology
Along with being showing improvement or progress day by day of mobile communication technology, the sharp increase of mobile subscriber's quantity, current mobile radio system all needs to support the terminal of some.That is to say that system need comprise the base station of some, each base station needs to communicate by letter simultaneously with the user of some.
Because the terminal random dispersion is in the base station range of whole communication system,, need to initiate random access procedure when terminal needs and base station when communicating.Therefore, access technology accounts for consequence at various radio communication multiple access systems at random.Below the access control technology in the mobile communication system is made brief description.
In mobile communication system, terminal is in each neighbor cell when mobile, and after entering completing place, some sub-districts and registering, terminal just resides in this sub-district, and enters idle condition, and this sub-district also just is called the current area of terminal.Under idle condition, if terminal is carried out the subdistrict position renewal process, perhaps need the paging that the sub-district is come is replied, perhaps need to set up calling with other user, comprise service request, the request of sending SMS message etc., then terminal can send insert request to the current area base station.Need to prove that random access procedure is initiated by this terminal.Terminal sends the request of access to cell base station on Random Access Channel, carry out access exploration.Receive the access request of portable terminal when network side after, just on a common signal channel to terminal letter in reply road assignment messages, terminal and base station are mutual at the enterprising line data of particular channel that distributes then.Need to prove that also the random access procedure that terminal is initiated is the access-in resource according to the current area base station, and finish according to specific algorithm.Terminal is selected access slot in available access-in resource, this selection is at random, and the base station is after receiving the access exploration of portable terminal then, and cell base station just sends one and inserts Indication message to terminal, shows whether current terminal inserts success.Get nowhere if insert at random, terminal then can't be carried out data interaction with current area so, can not finish the function of conversation or transfer of data.
Random Access Channel is usually by Access Preamble and random accessing message two parts are formed at random.The function of Access Preamble is to realize uplink synchronous at random, carries random identification number and other information etc.The random accessing message part is carried connectivity request message etc. usually.Wherein, Access Preamble is called random access probe again at random.
The design of Access Preamble need be considered the catch complexity of base station for prefix sequence at random, the complexity that the base station is detected, and interference free performance, and the performance under the different transmission environment or the like.
At present, in wireless communication protocol C802.20, the design that transmitting terminal sends Access Preamble at random as shown in Figure 1.Transmitting terminal is at first selected signature sequence from candidate's signature sequence, adopt the Walsh sign indicating number (Walsh code) of 1024 bits as signature sequence in this scheme.After the signature sequence process scrambler scrambling of 1024 bits, line up the matrix of 128 row, 8 row.Each is listed as discrete Fourier transform (DFT) (Discrete Fourier Transform is called for short " the DFT ") conversion through 128.128 data that obtain after the conversion are mapped to OFDM (Orthogonal Frequency Division Multiplexing, abbreviation " OFDM ") on continuous 128 subcarrier of system, again through the OFDM modulation, as contrary fast fourier transform (Inverse Fast Fourier Transform through 512, abbreviation " IFFT ") after the conversion, add Cyclic Prefix, go out by antenna transmission as Access Preamble at random.Send 8 row altogether, accounted for 8 OFDM symbols.In 802.20, a physical frame has comprised 8 OFDM symbols, so the transmission of Access Preamble has taken 128 subcarriers on the physical frame at random.
The design that receiving terminal receives Access Preamble at random as shown in Figure 2, the at first signal process OFDM demodulation that antenna is received, as remove fast fourier transform (the Fast FourierTransform that circulates and carry out after embedding is sewed at 512, be called for short " FFT "), corresponding 128 subcarriers extract prefix data during then from transmission, form row, extract 8 row altogether.Every columns obtains the signature sequence data of 128 demodulation respectively according to through 128 contrary discrete Fourier transform (DFT) (Inverse Discrete Fourier Transform is called for short " IDFT ").The signature sequence data of the demodulation of 128 elements of 8 row rearrange the sequence of 1024 elements that revert to scrambling, after the coherent detection of this sequence through the Walsh sign indicating number of descrambling and 1024 bits, obtain detection signal.Whether surpass threshold value according to detection signal and judge whether to catch this prefix, if detection signal surpasses threshold value, then think to catch this prefix, base station as receiving terminal sends confirmation for the terminal as transmitting terminal at down channel, if detection signal does not surpass threshold value, then think and do not catch this prefix.
Because terminal when sending prefix sequence and the base station and the uplink synchronous that is unrealized, therefore, when carrying out coherent detection, need receive signal to antenna and carry out time-shifting, after OFDM demodulation etc., do coherent detection more then.
In actual applications, have following problem: the amount of calculation of (1) receiving terminal is very big, receives complex structure.Since at random Access Preamble only 128 subcarriers in 512 all OFDM subcarriers upload and give, and when sending prefix sequence and the base station and the uplink synchronous that is unrealized, timing information is unknown, therefore, receiving terminal is when carrying out time synchronized, need carry out 512 FFT computing, 128 IDFT computing and the related operation of Walsh sign indicating number again to the signal sampling point of each new reception, cause the huge operand of receiving terminal needs, had to possess extremely complicated receiver structure.
(2) poor performance under the high-speed case.Because the Walsh sign indicating number that transmitted has occupied 8 OFDM symbols, when terminal was in high-speed mobile, great changes will take place for the characteristic of channel, and receiving terminal carries out the Walsh sign indicating number when relevant, correlation peak since the great variety of the characteristic of channel will decline to a great extent, thereby influence performance.In addition, because the great variety of the characteristic of channel makes that the orthogonality between the Walsh sign indicating number is destroyed, thereby the detection performance of Walsh sign indicating number will be declined to a great extent.
(3) to other terminal serious interference.Because the Walsh sign indicating number transmits in whole subframe, timing error during reverse access not theing consider usually to cause mainly due to propagation delay, therefore, Access Preamble exists under the situation of inevitable time error and will seriously disturb other terminal generation of next frame at random.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of detection method, terminal and network equipment that inserts at random, and the amount of calculation that makes network side detect when inserting is at random significantly reduced, and relevant device is simplified.
For achieving the above object, the invention provides a kind ofly, comprise following steps based on the detection method that inserts at random in the system of OFDM:
Terminal sends signature sequence in the full range band in the OFDM mode;
Network side detects described signature sequence in time domain after the signal of receiving is removed Cyclic Prefix.
Wherein, described signature sequence is one of following:
The PN sequence of GCL sequence, Walsh sign indicating number, Walsh sign indicating number, PN sequence or process discrete Fourier transform (DFT) through discrete Fourier transform (DFT).
In this external described method, described terminal is mapped in described signature sequence on the continuous sub-carriers and sends;
Described network side detects described signature sequence by the relevant mode of direct time-domain.
In this external described method, also comprise following steps:
Described network side is according to the result who detects described signature sequence in time domain, and whether judgement has at random that Access Preamble is hunted down, and is hunted down then exports corresponding signature sequence number and correction of timing information if define at random Access Preamble.
In this external described method, described terminal is mapped in described signature sequence on the equally spaced subcarrier and sends, and all the other subcarriers fill out 0;
Described network side detects described signature sequence by the relevant mode of time-domain difference.
In this external described method, also comprise following steps:
Described network side is according to the result who detects described signature sequence in time domain, whether judgement has at random, and Access Preamble is hunted down, Access Preamble is hunted down then exports corresponding correction of timing information if define at random, removes the described signal behind the Cyclic Prefix and identifies described signature sequence according to this correction of timing information correction.
In this external described method, the described signature sequence of identification one of in the following manner:
Candidate's signature sequence is relevant with received signal, detect the output energy and whether surpass threshold value;
To described signature sequence is the situation of Walsh sequence, adopts the mode of Ha Dema conversion to discern;
To described signature sequence is the situation of GCL sequence, adopts the mode of differential coding-contrary multiple sharp leaf transformation to discern.
In this external described method, the sub-carrier number of the described signature sequence of actual bearer is less than or equal to the sub-carrier number of full range band.
In this external described method, described signature sequence is made up of at least one subsequence, and each subsequence sends in an OFDM symbol, and each subsequence of forming same signature sequence is identical or different.
In this external described method, described signature sequence sends in continuous OFDM symbol, the actual OFDM symbolic number M that sends described signature sequence is less than the continuous OFDM symbolic number N of system assignment to Random Access Channel, and the OFDM symbol that does not carry described signature sequence does not carry data.
In this external described method, described signature sequence adopts τ symbol of random delay, sends in [τ, τ+M-1] symbol, and wherein, τ is the integer more than or equal to 0, and τ+M-1≤N-1;
Last OFDM symbol does not carry data in N the continuous OFDM symbol.
The present invention also provides a kind of terminal based on OFDM, comprises:
Generate the unit of signature sequence;
The signature sequence that generates is modulated to the unit of ofdm signal;
In the full range band, send the unit of described ofdm signal.
Wherein, described signature sequence sends in continuous OFDM symbol, and the actual OFDM symbolic number M that sends described signature sequence is less than the continuous OFDM symbolic number N of system assignment to Random Access Channel, and the OFDM symbol that does not carry described signature sequence does not carry data; Wherein, described signature sequence adopts τ symbol of random delay, sends in [τ, τ+M-1] symbol, and wherein, τ is the integer more than or equal to 0, and τ+M-1≤N-1.
In addition, the sub-carrier number of the described signature sequence of actual bearer is less than or equal to the sub-carrier number of full range band.
In addition, the unit that described signature sequence is modulated to ofdm signal one of in the following manner is mapped to subcarrier with described signature sequence:
Described signature sequence is mapped on the continuous sub-carriers; Or
Described signature sequence is mapped on the equally spaced subcarrier sends, all the other subcarriers fill out 0.
The present invention also provides a kind of network equipment based on OFDM, comprises:
Receive the unit of ofdm signal;
The signal of receiving is removed the unit of Cyclic Prefix;
The signal of removing Cyclic Prefix is detected the unit of described signature sequence in time domain.
Wherein, the described unit that detects described signature sequence in time domain detects described signature sequence by the relevant mode of direct time-domain.
In addition, also comprise, according to the result who detects described signature sequence in time domain, whether judgement has at random that Access Preamble is hunted down, if define that Access Preamble at random is hunted down then the unit of exporting corresponding signature sequence number and correction of timing information.
In addition, the described unit that detects described signature sequence in time domain detects described signature sequence by the relevant mode of time-domain difference.
In addition, also comprise:
According to the result who detects described signature sequence in time domain, whether judgement has at random that Access Preamble is hunted down, if define that Access Preamble at random is hunted down then the unit of exporting corresponding correction of timing information;
Remove the described signal behind the Cyclic Prefix and identify the unit of described signature sequence according to described correction of timing information correction.
By finding that relatively the main distinction of technical scheme of the present invention and prior art is, by send the ofdm signal that contains signature sequence in the full range band, makes that the detection signature sequence becomes possibility in time domain.Because do not need all to use all candidate's signature sequences to carry out associative operation, so the detection in the time domain has significantly reduced the amount of calculation of network side to all possible time-shifting.The transmission of full range band is meant that taking all subcarriers sends the prefix that contains signature sequence, and signature sequence can be mapped to all subcarriers, also can only be mapped to the subcarrier of a part, and other subcarrier does not carry data.
Send signature sequence because be in the full range band, only in partial-band, send signature sequence relatively in the prior art, the present invention can finish the transmission of signature sequence with symbol still less, thereby still can obtain quite good detecting effectiveness under the moving velocity of terminal condition with higher.
Can send signature sequence on continuous sub-carriers, the mode relevant by direct time-domain detects, and this mode is convenient to directly obtain signature sequence and correction of timing information.
Also can send signature sequence on equally spaced subcarrier, the mode relevant by time-domain difference detects.With respect to the relevant mode of direct time-domain, the mode that time-domain difference is relevant can detect whether there is prefix with littler operand, only when having prefix, further identify concrete signature sequence again, thereby insert under the not too frequent situation in terminal, the relevant the amount of calculation of detection is less with inserting at random.
After can finishing in the OFDM symbol transmission of carrying signature sequence, take an OFDM symbol subsequently more, do not carry data as the guard time of reserving.Because the time is gone up terminal and the base station is not synchronous, adopt the guard time of reserving to prevent that Access Preamble guarantees the performance of Traffic Channel to the interference of Traffic Channel at random when inserting at random.
Before can also sending at the OFDM symbol of carrying signature sequence, several OFDM symbols of random delay, Access Preamble detects the chance of collision mutually thereby reduce at random.
Description of drawings
Fig. 1 sends the schematic diagram of Access Preamble at random according to terminal in the prior art;
Fig. 2 receives the schematic diagram of Access Preamble at random according to network side in the prior art;
Fig. 3 is based on the detection method flow chart that inserts at random in the system of OFDM according to first embodiment of the invention;
Fig. 4 sends the schematic diagram of Access Preamble at random according to first embodiment of the invention based on terminal in the detection method that inserts at random in the system of OFDM;
Fig. 5 receives the schematic diagram of Access Preamble at random according to first embodiment of the invention based on network side in the detection method that inserts at random in the system of OFDM;
Fig. 6 is based on the detection method flow chart that inserts at random in the system of OFDM according to second embodiment of the invention;
Fig. 7 receives the schematic diagram of Access Preamble at random according to second embodiment of the invention based on network side in the detection method that inserts at random in the system of OFDM.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Core of the present invention is, terminal is mapped to the signature sequence that generates in the continuous sub-carriers, perhaps, equally spaced be mapped in a part of subcarrier, other subcarrier does not carry data, in the full range band, send the ofdm signal that contains signature sequence, make receiving terminal to detect signature sequence by the relevant mode of direct time-domain or by the relevant mode of time-domain difference, thereby avoid all using all candidate's signature sequences to carry out associative operation, significantly reduced the amount of calculation of network side all possible time-shifting.
More than core of the present invention has been done simple declaration, below according to this principle, first execution mode of the present invention is described in detail based on the detection method that inserts at random in the system of OFDM.
As shown in Figure 3, in step 301, terminal generates signature sequence.Specifically, terminal generation length is m*N 2The signature sequence of bit that is to say, this signature sequence is N by the m segment length 2Subsequence form.Wherein, m is the integer more than or equal to 1, N 2Be available sub-carrier number in each OFDM symbol of ofdm system, this sub-carrier number is less than or equal to the total number of sub-carriers that each OFDM symbol of ofdm system comprises.Each subsequence of forming signature sequence comprises: the PN sequence of the Walsh sign indicating number of GCL sequence, Walsh sign indicating number or process DFT conversion, PN sequence or process DFT conversion etc.The subsequence of forming same signature sequence can be identical, also can be different, such as, in the same signature sequence by the multiple GCL sequence of two column weights.
Then, enter step 302, terminal is mapped to signature sequence on the continuous sub-carriers, sends in the OFDM mode in the full range band.Specifically, the length that terminal can be generated is m*N 2The signature sequence of bit is lined up N 2The array of row m row is mapped to each row wherein respectively on all available subcarriers of an OFDM symbol, and the m row is mapped to m continuous OFDM symbol, through going out by antenna transmission after the OFDM modulation, as shown in Figure 4.Because in the present embodiment, signature sequence sends by all available subcarriers in the OFDM symbol, therefore, only in partial-band, send signature sequence relatively in the prior art, present embodiment can be finished the transmission of signature sequence with symbol still less, thereby still can obtain quite good detecting effectiveness under the moving velocity of terminal condition with higher.
Be not difficult to find that the value of the m translational speed with this terminal in fact is relevant, the speed that terminal moves is high more, and the numerical value of the m that chooses is just more little.Such as for the 5M bandwidth, the system of 512 subcarriers is if choose m smaller or equal to 4, promptly by finishing the transmission of signature sequence smaller or equal to 4 OFDM symbols, even then also can obtain preferable performance under 300 kilometers/hour speed.
Then, enter step 303, after network side removes the signal of receiving to Cyclic Prefix, carry out the detection signature sequence by the mode that direct time-domain is relevant, as shown in Figure 5.Specifically, because terminal sends the signature sequence that generates by available subcarriers all in the OFDM symbol, therefore, even the total number of sub-carriers that available sub-carrier number is comprised less than each OFDM symbol of ofdm system in each OFDM symbol, this conduct signature sequence of Access Preamble has at random still taken whole frequency band.So, network side to the received signal, after removing Cyclic Prefix, can adopt the relevant method of direct time-domain to detect, and not need all to use all candidate's signature sequences to carry out associative operation, significantly reduce the amount of calculation of network side all possible time-shifting.
Then, enter step 304, whether network side judgement has at random that Access Preamble is hunted down.Specifically, network side is according in the result of time domain detection signature sequence, and whether judgement has at random that Access Preamble is hunted down, if having then enter step 305, otherwise, process ends.
In step 305, network side obtains corresponding signature sequence number and correction of timing information.Specifically, be hunted down and then obtain corresponding signature sequence number and correction of timing information if network side according in the result of time domain detection signature sequence, defines at random Access Preamble.Because terminal sends signature sequence on continuous sub-carriers, so network side can detect by the relevant mode of direct time-domain, directly obtains signature sequence and correction of timing information.
Second execution mode of the present invention based on the detection method that inserts at random in the system of OFDM as shown in Figure 6.
In step 601, terminal generates signature sequence.Specifically, terminal generation length is m* (N 2/ 2) signature sequence of bit that is to say, this signature sequence is N by the m segment length 2/ 2 subsequence is formed.Wherein, m is the integer more than or equal to 1, N 2Be available sub-carrier number in each OFDM symbol of ofdm system, this sub-carrier number is less than or equal to the total number of sub-carriers that each OFDM symbol of ofdm system comprises.Each subsequence of forming signature sequence comprises: the PN sequence of the Walsh sign indicating number of GCL sequence, Walsh sign indicating number or process DFT conversion, PN sequence or process DFT conversion etc.The subsequence of forming same signature sequence can be identical, also can be different, such as, in the same signature sequence by the multiple GCL sequence of two column weights.
Then, enter step 602, terminal is mapped to signature sequence on the equally spaced available subcarrier, sends in the OFDM mode in the full range band.Specifically, the length that terminal can be generated is m*N 2The signature sequence of/2 bits is lined up N 2The array of/2 row m row is mapped to each row wherein respectively on the equally spaced available subcarrier of an OFDM symbol, and as at odd number or only on the even number available subcarrier, other are that the available subcarrier that is mapped to does not carry data.And m row are mapped to m continuous OFDM symbol, make network side on time domain, make simple correlation to handle and obtain regularly synchronously so that produce on two time domains identical signal.N 2After the signature sequence of/2 row m row is mapped on the equally spaced available subcarrier, carries out OFDM and modulate and go out by antenna transmission.Wherein, the value of the m still translational speed with this terminal is relevant, and the speed that terminal moves is high more, and the numerical value of the m that chooses is just more little.Such as for the 5M bandwidth, the system of 512 subcarriers is if choose m smaller or equal to 4, promptly by finishing the transmission of signature sequence smaller or equal to 4 OFDM symbols, even then also can obtain preferable performance under 300 kilometers/hour speed.
Need to prove, be m*N in the present embodiment with length 2The signature sequence of/2 bits is that example describes, but in actual applications, the length of subsequence is set to bit still less in can also signature sequence, each subsequence wherein is mapped to respectively on the equally spaced available subcarrier of an OFDM symbol, as 3 subcarriers at interval.
In step 603, after network side removes the signal of receiving to Cyclic Prefix, by the relevant mode detection signature sequence of time-domain difference, as shown in Figure 7.Specifically, network side is sampled the first half and the latter half of time-domain signal respectively to each OFDM time-domain signal, again two signals is done coherent detection, and the detected energy on m the OFDM symbol is added up, and produces Differential Detection.Because terminal is mapped to signature sequence on the equally spaced available subcarrier, other are that the available subcarrier that is mapped to does not carry data.Therefore, even the total number of sub-carriers that available sub-carrier number is comprised less than each OFDM symbol of ofdm system in each OFDM symbol, this conduct signature sequence of Access Preamble has at random still taken whole frequency band.So network side does not need all to use all candidate's signature sequences to carry out associative operation to all possible time-shifting, has significantly reduced the amount of calculation of network side.
Then, enter step 604, whether network side judgement has at random that Access Preamble is hunted down.Specifically, network side is according in the result of time domain detection signature sequence, and whether judgement has at random that Access Preamble is hunted down, if having then enter step 605, otherwise, process ends.
In step 605, network side obtains corresponding correction of timing information.Specifically, be hunted down and then obtain corresponding correction of timing information if network side according in the result of time domain detection signature sequence, defines at random Access Preamble.
Then, enter step 606, network side identifies signature sequence.Specifically, network side is removed received signal behind the Cyclic Prefix according to the correction of timing information correction that is obtained, and then identifies signature sequence, as shown in Figure 7.Such as, can adopt candidate's signature sequence relevant with received signal, detect the output energy and whether discern signature sequence above the method for threshold value; Also can select specific detector according to the characteristic of signature sequence, adopt the Ha Dema change detection as the Walsh sequence, the GCL sequence adopts the method for differential coding-contrary multiple sharp leaf transformation to detect, and identifies signature sequence.
In the present embodiment, because terminal sends signature sequence on equally spaced subcarrier, therefore network side can detect whether there is prefix with littler operand by the relevant mode of time-domain difference, only when having prefix, further identify concrete signature sequence again, thereby insert under the not too frequent situation in terminal, the relevant the amount of calculation of detection is less with inserting at random.
The 3rd execution mode of the present invention on the basis of first or second execution mode, reserves the OFDM symbol as guard time, not the bearer service data based on the detection method that inserts at random in the system of OFDM.
Specifically, the supposing the system physical channel resources of distributing to Random Access Channel accounts for M 2, individual continuous OFDM symbol, then designing at random, Access Preamble accounts for M 1Individual continuous OFDM symbol, M 2〉=M 1+ 1.
Signature sequence adopts τ symbol of random delay, sends in continuous OFDM symbol, promptly at [τ, τ+M 1-1] send in the symbol, wherein, τ is the integer more than or equal to 0, τ+M 1-1≤M 2-1, last the OFDM symbol that does not carry signature sequence reserves and is used as guard time, does not carry data.
Terminal because on the time and base station is not synchronous, adopts the guard time of reserving can prevent that Access Preamble guarantees the performance of Traffic Channel to the interference of Traffic Channel at random when inserting at random.And by several OFDM symbols of random delay, can effectively reducing at random, Access Preamble detects the chance of collision mutually.
The 4th execution mode of the present invention is based on the terminal of OFDM, comprises the unit that generates signature sequence, the signature sequence that generates is modulated to the unit of ofdm signal and sends the unit of ofdm signal in the full range band.
Specifically, the unit that the signature sequence that generates is modulated to ofdm signal is mapped in signature sequence on the continuous sub-carriers, perhaps, signature sequence is mapped on the equally spaced subcarrier sends, all the other subcarriers fill out 0, and the sub-carrier number of actual bearer signature sequence is less than or equal to the sub-carrier number of full range band.
Then, by the unit that in the full range band, sends ofdm signal signature sequence is sent in continuous OFDM symbol, the actual OFDM symbolic number M that sends signature sequence is less than the continuous OFDM symbolic number N of system assignment to Random Access Channel, and the OFDM symbol that does not carry signature sequence does not carry data.Wherein, signature sequence adopts τ symbol of random delay, sends in [τ, τ+M-1] symbol, and τ is the integer more than or equal to 0, and τ+M-1≤N-1.
By in the full range band, sending the ofdm signal that contains signature sequence, make that the detection signature sequence becomes possibility in time domain, making network side detect does not need when inserting at random all to use all candidate's signature sequences to carry out associative operation to all possible time-shifting, significantly reduce amount of calculation, simplified relevant device.And, can prevent that by adopting the guard time of reserving Access Preamble guarantees the performance of Traffic Channel to the interference of Traffic Channel at random, Access Preamble detects the chance of collision mutually to adopt random delay also to help reducing at random.
The 5th execution mode of the present invention is based on the network equipment of OFDM, comprise: receive ofdm signal the unit, with the signal of receiving remove the unit of Cyclic Prefix, to the signal of removing Cyclic Prefix in the unit of time domain detection signature sequence with according to result in time domain detection signature sequence, whether judgement has at random that Access Preamble is hunted down, if define that Access Preamble at random is hunted down then the unit of exporting corresponding signature sequence number and correction of timing information.Wherein, the mode detection signature sequence that the signal of removing Cyclic Prefix is correlated with by direct time-domain in the unit of time domain detection signature sequence.
Network equipment is by the relevant mode detection signature sequence of direct time-domain, can significantly reduce the amount of calculation of detection when inserting at random, is convenient to directly obtain signature sequence and correction of timing information.
The 6th execution mode of the present invention is based on the network equipment of OFDM, comprise: receive ofdm signal the unit, with the signal of receiving remove the unit of Cyclic Prefix, to the signal of removing Cyclic Prefix in the unit of time domain detection signature sequence, according to result in time domain detection signature sequence, whether judgement has at random that Access Preamble is hunted down, and is hunted down then exports the unit of corresponding correction of timing information and remove the signal behind the Cyclic Prefix and identify the unit of signature sequence according to the correction of timing information correction if define Access Preamble at random.Wherein, the mode detection signature sequence of being correlated with by time-domain difference in the unit of time domain detection signature sequence.
Network equipment is by the relevant mode detection signature sequence of time-domain difference, can detect with littler operand and whether have prefix, only when having prefix, further identify concrete signature sequence again, thereby insert under the not too frequent situation in terminal, the relevant the amount of calculation of detection is less with inserting at random.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.

Claims (20)

1. one kind based on the detection method that inserts at random in the system of OFDM, it is characterized in that, comprises following steps:
Terminal sends signature sequence in the full range band in the OFDM mode;
Network side detects described signature sequence in time domain after the signal of receiving is removed Cyclic Prefix.
2. according to claim 1ly it is characterized in that described signature sequence is one of following based on the detection method that inserts at random in the system of OFDM:
The PN sequence of GCL sequence, Walsh sign indicating number, Walsh sign indicating number, PN sequence or process discrete Fourier transform (DFT) through discrete Fourier transform (DFT).
3. according to claim 1 based on the detection method that inserts at random in the system of OFDM, it is characterized in that described terminal is mapped in described signature sequence on the continuous sub-carriers and sends;
Described network side detects described signature sequence by the relevant mode of direct time-domain.
4. according to claim 3ly it is characterized in that, also comprise following steps based on the detection method that inserts at random in the system of OFDM:
Described network side is according to the result who detects described signature sequence in time domain, and whether judgement has at random that Access Preamble is hunted down, and is hunted down then exports corresponding signature sequence number and correction of timing information if define at random Access Preamble.
5. according to claim 1ly it is characterized in that based on the detection method that inserts at random in the system of OFDM described terminal is mapped in described signature sequence on the equally spaced subcarrier and sends, all the other subcarriers fill out 0;
Described network side detects described signature sequence by the relevant mode of time-domain difference.
6. according to claim 5ly it is characterized in that, also comprise following steps based on the detection method that inserts at random in the system of OFDM:
Described network side is according to the result who detects described signature sequence in time domain, whether judgement has at random, and Access Preamble is hunted down, Access Preamble is hunted down then exports corresponding correction of timing information if define at random, removes the described signal behind the Cyclic Prefix and identifies described signature sequence according to this correction of timing information correction.
7. according to claim 6ly it is characterized in that, one of in the following manner the described signature sequence of identification based on the detection method that inserts at random in the system of OFDM:
Candidate's signature sequence is relevant with received signal, detect the output energy and whether surpass threshold value;
To described signature sequence is the situation of Walsh sequence, adopts the mode of Ha Dema conversion to discern;
To described signature sequence is the situation of GCL sequence, adopts the mode of differential coding-contrary multiple sharp leaf transformation to discern.
8. according to claim 1 based on the detection method that inserts at random in the system of OFDM, it is characterized in that the sub-carrier number of the described signature sequence of actual bearer is less than or equal to the sub-carrier number of full range band.
9. according to each is described based on the detection method that inserts at random in the system of OFDM in the claim 1 to 8, it is characterized in that, described signature sequence is made up of at least one subsequence, each subsequence sends in an OFDM symbol, and each subsequence of forming same signature sequence is identical or different.
10. according to claim 9 based on the detection method that inserts at random in the system of OFDM, it is characterized in that, described signature sequence sends in continuous OFDM symbol, the actual OFDM symbolic number M that sends described signature sequence is less than the continuous OFDM symbolic number N of system assignment to Random Access Channel, and the OFDM symbol that does not carry described signature sequence does not carry data.
11. according to claim 10ly it is characterized in that based on the detection method that inserts at random in the system of OFDM described signature sequence adopts τ symbol of random delay, in [τ, τ+M-1] symbol, send, wherein, τ is the integer more than or equal to 0, and τ+M-1≤N-1;
Last OFDM symbol does not carry data in N the continuous OFDM symbol.
12. the terminal based on OFDM is characterized in that, comprises:
Generate the unit of signature sequence;
The signature sequence that generates is modulated to the unit of ofdm signal;
In the full range band, send the unit of described ofdm signal.
13. the terminal based on OFDM according to claim 12, it is characterized in that, described signature sequence sends in continuous OFDM symbol, the actual OFDM symbolic number M that sends described signature sequence is less than the continuous OFDM symbolic number N of system assignment to Random Access Channel, and the OFDM symbol that does not carry described signature sequence does not carry data; Wherein, described signature sequence adopts τ symbol of random delay, sends in [τ, τ+M-1] symbol, and wherein, τ is the integer more than or equal to 0, and τ+M-1≤N-1.
14. the terminal based on OFDM according to claim 12 is characterized in that the sub-carrier number of the described signature sequence of actual bearer is less than or equal to the sub-carrier number of full range band.
15. the terminal based on OFDM according to claim 12 is characterized in that, the unit that described signature sequence is modulated to ofdm signal one of in the following manner is mapped to subcarrier with described signature sequence:
Described signature sequence is mapped on the continuous sub-carriers; Or
Described signature sequence is mapped on the equally spaced subcarrier sends, all the other subcarriers fill out 0.
16. the network equipment based on OFDM is characterized in that, comprises:
Receive the unit of ofdm signal;
The signal of receiving is removed the unit of Cyclic Prefix;
The signal of removing Cyclic Prefix is detected the unit of described signature sequence in time domain.
17. the network equipment based on OFDM according to claim 16 is characterized in that, the described unit that detects described signature sequence in time domain detects described signature sequence by the relevant mode of direct time-domain.
18. the network equipment based on OFDM according to claim 17, it is characterized in that, also comprise, according to the result who detects described signature sequence in time domain, whether judgement has at random that Access Preamble is hunted down, if define that Access Preamble at random is hunted down then the unit of exporting corresponding signature sequence number and correction of timing information.
19. the network equipment based on OFDM according to claim 16 is characterized in that, the described unit that detects described signature sequence in time domain detects described signature sequence by the relevant mode of time-domain difference.
20. the network equipment based on OFDM according to claim 19 is characterized in that, also comprises:
According to the result who detects described signature sequence in time domain, whether judgement has at random that Access Preamble is hunted down, if define that Access Preamble at random is hunted down then the unit of exporting corresponding correction of timing information;
Remove the described signal behind the Cyclic Prefix and identify the unit of described signature sequence according to described correction of timing information correction.
CN200610115131XA 2006-08-18 2006-08-18 Detection method, terminal and network device for random access Expired - Fee Related CN101128004B (en)

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