CN101378374B - Dual-sequence association detection method for OFDM system random access process - Google Patents
Dual-sequence association detection method for OFDM system random access process Download PDFInfo
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- CN101378374B CN101378374B CN2007101484492A CN200710148449A CN101378374B CN 101378374 B CN101378374 B CN 101378374B CN 2007101484492 A CN2007101484492 A CN 2007101484492A CN 200710148449 A CN200710148449 A CN 200710148449A CN 101378374 B CN101378374 B CN 101378374B
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Abstract
The invention discloses a double-sequence joint detection method in a random access process of an Orthogonal Frequency Division Multiplexing (OFDM) system, which can improve the user access rate. The method comprises the following steps: (a) a node B broadcasts time domain, frequency domain and sequence resource of a Random Access Channel (RACH) to UE, and the bandwidth of the RACH is divided into a fist subsequence channel and a second subsequence channel according to the frequency domain; (b) the UE randomly selects the time domain resource, selects out a first sequence from the sequence resource, selects one of the optional correlation operation modes, carries out correlation operation to the first sequence so as to obtain a second sequence, sends out the first sequence on the first subsequence channel and simultaneously sends out the second sequence on the second subsequence channel; and (c) when the node B detects that the first sequences sent by a plurality of UE on the same time domain resource are the same, the second sequences sent by the UE are detected, if the second sequences are not the same, the different users can be distinguished according to the second sequences; if the second sequences are the same, the occurrence of collision is judged out.
Description
Technical field
The present invention relates to time division duplex (TDD, Time Division Duplex) access technology at random in the system, relate in particular in OFDM (OFDM, the Orthogonal Frequency DivisionMultiplexing) technology sequence detecting method in the random access procedure.
Background technology
In order to satisfy the requirement of the diversified and higher access capacity of communication, the introducing of tdd systems makes that the uplink and downlink user can carry out on the different time multiplexing, thereby improve power system capacity, improves resource utilization.
Along with the development of Digital Signal Processing and high speed device, OFDM (OFDM) technology has obtained very successful application in communication system.In the orthogonal frequency division multiplexi, at frequency domain frequency spectrum has been divided into the subchannel of several quadratures, the carrier wave of each subchannel is overlapped, has improved the availability of frequency spectrum.
Access technology is very important a kind of technology in the communication system at random, and it is mainly used in following situation: when the firm start of user has needed access network; When the user from a sub-district when another sub-district need be switched; When the user when silent status forwards state of activation to; Situation such as when the user uplink synchronization loss.
The utilizable access-in resource of Random Access Channel (RACH, Random Access Channel) itself is divided into three major types, time resource, frequency resource, and code source (referring to the sequence resource here).If different users has selected identical running time-frequency resource and identical access lead sequence (as the Zadoff-Chu sequence), will bump between the user so.If two subscriber equipmenies (UE) are more or less the same apart from the distance of base station, or the influence of (as channel circumstance etc.) because other factors, might these two users on identical running time-frequency resource, send in the identical access lead sequence, Node B (Node B) can not detect the generation of collision, when Node B has distributed identical ascending resource for these two UE, the UE information transmitted will bump.When the collision between the user can be detected by Node B, Node B will not send corresponding information to UE, and UE does not receive return information at default in the time, then think to send failure, resends leading access sequence.
Summary of the invention
The technical problem to be solved in the present invention provides the dual-sequence association detection method in a kind of OFDM system random access process, improves user's access rate.
In order to address the above problem, the invention provides the dual-sequence association detection method in a kind of OFDM system random access process, may further comprise the steps:
(a) Node B is given subscriber equipment with time domain, frequency domain and the sequence resource broadcast of Random Access Channel, and the bandwidth of described Random Access Channel is divided into the first subsequence channel and the second subsequence channel by frequency domain;
(b) subscriber equipment is selected running time-frequency resource at random, and from described sequence resource, select first sequence, from optional correlation operation mode, select a kind of, this first sequence is carried out correlation operation obtain one second sequence, send described first sequence at the described first subsequence channel, on the described second subsequence channel, send described second sequence simultaneously;
(c) Node B detects a plurality of subscriber equipmenies send on the same time-domain resource first sequence when identical, detect second sequence that these subscriber equipmenies send,, then distinguish different users in view of the above as these second sequence differences, if second sequence is identical, judging has collision to take place.
Further, described correlation operation mode is carried the subscriber equipment relevant information, and described Node B and subscriber equipment are associated described subscriber equipment relevant information with the correlation operation mode of second sequence; In described step (b), subscriber equipment is selected the correlation operation mode according to its relevant information; In described step (c), Node B parses the correlation operation mode that described second sequence is adopted, and then obtains the described relevant information of subscriber equipment.
Further, the first subsequence channel of described Random Access Channel and the second subsequence channel use two identical frequency domain resource of size and identical time-domain resource.
Further, in described step (b), described correlation operation is shift operation, and it is a kind of that described subscriber equipment is selected from promptly mobile what the displacement increments of optional displacement index, to obtaining second sequence after the displacement of first sequence; In described step (c), when Node B detects described second sequence, detect the displacement index of described second sequence, as displacement index difference, then distinguish different user in view of the above.
Further, described shift operation mode is carried the subscriber equipment relevant information, and described Node B and subscriber equipment are with the displacement correlation of indices connection of the described subscriber equipment relevant information and second sequence; In described step (c) Node B as identical second sequence of first sequence judging a plurality of subscriber equipmenies and send different and distinguish different user after, by detecting the displacement index of second sequence that described different user devices sends, parse described different user devices relevant information separately respectively; Node B is not as first sequence judging a plurality of subscriber equipmenies and send not simultaneously in described step (c), it then is described user equipment allocation resource, and detect the displacement index of second sequence that described subscriber equipment sends, separate out the relevant information of described subscriber equipment according to this displacement exponential solution.
Further, in the described step (a), described Node B informs that with broadcast mode the resource information of subscriber equipment also comprises having the optional mode information index of described correlation operation resource information, and subscriber equipment is known the optional mode of described correlation operation from the described index resource information that receives.
Further, in the described step (a), described Node B informs that with broadcast mode the resource information of subscriber equipment also comprises the index resource information, this index resource information comprises optional displacement index and corresponding subscriber equipment relevant information thereof, subscriber equipment is known optional displacement index and corresponding subscriber equipment relevant information thereof from described index resource information, described subscriber equipment is displacement index as its second sequence correspondence of picked at random from optional displacement index.
Further, the relevant information of described subscriber equipment is a kind of or its combination in user device attribute information, business information and the channel information.
Further, described displacement increment time corresponding is greater than the maximum delay extended protection time of default.
Further, in described step (c), Node B then is the corresponding resource of described user equipment allocation on same time-domain resource as when not detecting the first identical sequence.
Further, in described step (c), first sequence and second sequence homogeneous phase while that Node B sends on same running time-frequency resource as detecting a plurality of subscriber equipmenies, then do not return response to these subscriber equipmenies.
In the method for the present invention,,, reduced the probability of miscarriage of justice of false detection rate and hot zones though the bandwidth that takies is a former twice owing to adopt dual-sequence association to judge.Utilize two sequences to carry out joint-detection, judge the consistency of the auxiliary sequence that both adopt, like this, at first reduced the probability of miscarriage of justice of first sequence under the adverse circumstances, simultaneously, when different user has been selected identical running time-frequency resource, and when on first sequence, having selected identical sequence transmission, can it be distinguished by second sequence, improve the collision detection probability and improved access rate, on second sequence location, can also improve the amount of information of stochastic access channel bearing simultaneously by the different certain information of displacement index index carrying.
Description of drawings
Fig. 1 is the schematic diagram that the RACH channel resource is provided with in the present embodiment;
Fig. 2 is the flow chart of sequence detecting method in the present embodiment.
Embodiment
The present invention is directed to the collision detection between the user inserts in the present sub-district, the method that a kind of dual-sequence association detects has been proposed, its core concept is: increasing RACH channel width is former twice, introduce an additional access lead sequence, detect by two sequence associations, distinguish different users, improve user's access rate, the schematic diagram that the RACH channel resource is provided with as shown in Figure 1.
As shown in Figure 2, sequence detecting method may further comprise the steps:
Step 201, Node B is informed all UE with RACH channel available resources by broadcast mode, and described RACH channel time domain length is constant, and RACH channel width is expanded as former twice.
Described RACH channel available resources comprise that (displacement index resource can not broadcasted yet for time-domain resource, frequency domain resource, access lead sequence resource and displacement index resource, directly be configured on Node B and the UE), in the present embodiment, the bandwidth of described RACH channel has increased by one times with respect to simple sequence.In the prior art, after bumping, also can reduce the probability of collision by the bandwidth that increases the RACH channel, but the increase of this frequency domain resource mutually for purposes of the invention, is quite limited for the effect that reduces collision probability.Because it increases after the twice frequency domain resource, collision probability has just reduced half, and the present invention in conjunction with displacement index resource after, although increasing, bandwidth is twice, on frequency domain, do not increase the possibility of selecting, but the selectable displacement resource of UE is generally much larger than 2, and therefore the probability of collision will reduce greatly.In addition, the time-domain resource anxiety in the TDD system, and discontinuous two sequences are difficult to distinguish in the Node B side on time domain.Therefore the present invention has selected the increase frequency domain bandwidth to carry two sequences.
In the present embodiment, displacement index resource comprise the displacement index and with the corresponding UE relevant information of displacement index.
As shown in Figure 1, the RACH channel is divided into two parts by frequency domain, represent with the first subsequence channel RACH11 and the second subsequence channel RACH12 respectively that below the first subsequence channel and the second subsequence channel take two identical frequency domain resource of size and identical time-domain resource respectively.
Step 202, UE selects in running time-frequency resource that Node B provides and sequence resource at random, selects the first sequence (RACH earlier
11Sequence), and selects corresponding displacement index resource, described first sequence is shifted the back as the second sequence (RACH according to the UE relevant information
12Sequence), with described first sequence at RACH
11Last transmission, simultaneously with described second sequence at RACH
12Last transmission, i.e. RACH
11And RACH
12Whole as the uplink of a RACH resource;
Though present embodiment is to adopt shift operation, can also be the correlation operation except that shift operation in other embodiments,, thereby improve the precision that detects because, just can carry out joint-detection as long as first sequence is relevant with second sequence.And after Node B was received two sequences that a plurality of UE send, can correctly distinguish out which pair sequences from multiple combination was to send among the same UE, thereby avoided the wasting of resources that causes by may make up Resources allocation the time.
Second sequence is the shift sequence of first sequence, and first sequence has identical auxiliary sequence with second sequence.During displacement, need to guarantee RACH
12The length of sequence displacement increment is enough big, and displacement increment size time corresponding is greater than the maximum delay extended protection time, like this can be in the process that detects, with RACH
12On different sequence area branch away RACH simultaneously
12The displacement index can carry the UE relevant information, the displacement index refers to what displacement increments the number of times that is shifted promptly moves, and available displacement index is determined by the sequence length and the increment that is shifted.
Described UE relevant information can comprise as in UE attribute information such as grade (as VIP user or domestic consumer), business information such as class of service, channel information such as the channel quality etc. one or more.
For example, the default sequence has 512, and the displacement increment size is 32, and the index that then is shifted has 16 kinds of index values, is 0,1,2,3...15.Corresponding displacement situation is to move 0, move 32, move 64, move 96 ... move 480.Different displacement indexes or displacement index group can be represented different UE relevant informations, are that any one is represented VIP user or uses multicast service etc. in 0 to 7 as the displacement exponential quantity.Here it should be noted that and avoid making the judgement effect of second sequence lose efficacy that promptly different user has adopted the first identical sequence, owing to will transmit identical information, has adopted the second identical sequence again owing to needing to transmit certain information.The UE relevant information more to number of users should be distributed more displacement index resource, and the user selects on the index resource of correspondence at random.
System can be provided with displacement index resource, promptly has the value of displacement index to have 16 as having 16 kinds of displacement modes in the system, and the displacement index of VIP user's correspondence is any one in 0 to 7, and the displacement index of domestic consumer's correspondence is any one in 8 to 15.So, when system was provided with displacement index resource, UE selected displacement index resource at random according to the grade of self in index resource group, and first sequence is shifted according to the displacement index obtains second sequence.
In another embodiment, when system was not provided with the corresponding relation of displacement index resource and UE information, UE can select displacement mode that first sequence is shifted at random.
Step 203, Node B are after having received the RACH channel information that UE sent, and whether identical, if inequality, carry out next step, otherwise forward step 206 to if detecting first sequence that a plurality of subscriber equipmenies send on the same time-domain resource;
Step 204, Node B detect the displacement index of second sequence of described UE, parse the UE relevant information of being carried on second sequence;
Step 205, Node B are that UE distributes corresponding resource; Finish.
Step 206, Node B detect the displacement index of second sequence of a plurality of UE, judge whether the displacement index is identical, if different, carries out next step, otherwise, execution in step 208;
Step 207, Node B are distinguished different user and are parsed these users' RACH simultaneously
12The UE relevant information of being carried on the sequence for these UE distribute corresponding resource respectively, finishes;
Step 208, Node B are judged has collision to take place, and not to these UE return informations, UE does not receive the return information of Node B at default in the time, then think to send failure, will resend the access lead sequence.
For example, default access lead sequence length is 512, the displacement increment is 32, the user A of same sub-district and user B are in random access procedure, selected identical running time-frequency resource, and on RACH11, selected identical access lead sequence, user A is VIP user, displacement index on RACH12 is 4 (moving 128), user B is a domestic consumer, displacement index on RACH12 is 10 (moving 320), then Node B detect on the RACH11 user A and user B taken place the collision after, can distinguish them for different user in the difference of RACH12 superior displacement index according to both, just can distribute corresponding resource, finish two users' random access procedure for user A and user B.Simultaneously can know that user A is VIP user, user B is domestic consumer's (exponential quantity that wherein is shifted is that any one represents VIP user in 0 to 7, and the displacement exponential quantity is that any one represents domestic consumer in 8 to 15).
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 of ordinary skill in the art are when making various corresponding changes and distortion according to the present invention, and these change and be out of shape the protection range that all should belong to the appended claim of the present invention accordingly.
Claims (11)
1. the dual-sequence association detection method in the OFDM system random access process is characterized in that, may further comprise the steps:
(a) Node B is given subscriber equipment with time domain, frequency domain and the sequence resource broadcast of Random Access Channel, and the bandwidth of described Random Access Channel is divided into the first subsequence channel and the second subsequence channel by frequency domain;
(b) subscriber equipment is selected running time-frequency resource at random, and from described sequence resource, select first sequence, from optional correlation operation mode, select a kind of, this first sequence is carried out correlation operation obtain one second sequence, send described first sequence at the described first subsequence channel, on the described second subsequence channel, send described second sequence simultaneously;
(c) Node B detects a plurality of subscriber equipmenies send on the same time-domain resource first sequence when identical, detect second sequence that these subscriber equipmenies send,, then distinguish different users in view of the above as these second sequence differences, if second sequence is identical, judging has collision to take place.
2. the method for claim 1 is characterized in that,
Described correlation operation mode is carried the subscriber equipment relevant information, and described Node B and subscriber equipment are associated described subscriber equipment relevant information with the correlation operation mode of second sequence;
In described step (b), subscriber equipment is selected the correlation operation mode according to its relevant information;
In described step (c), Node B parses the correlation operation mode that described second sequence is adopted, and then obtains the described relevant information of subscriber equipment.
3. the method for claim 1 is characterized in that,
The first subsequence channel of described Random Access Channel and the second subsequence channel use two identical frequency domain resource of size and identical time-domain resource.
4. as claim 1,2 or 3 described methods, it is characterized in that,
In described step (b), described correlation operation is shift operation, and it is a kind of that described subscriber equipment is selected from promptly mobile what the displacement increments of optional displacement index, to obtaining second sequence after the displacement of first sequence;
In described step (c), when Node B detects described second sequence, detect the displacement index of described second sequence, as displacement index difference, then distinguish different user in view of the above.
5. method as claimed in claim 4 is characterized in that,
Described shift operation mode is carried the subscriber equipment relevant information, and described Node B and subscriber equipment are with the displacement correlation of indices connection of the described subscriber equipment relevant information and second sequence;
In described step (c) Node B as identical second sequence of first sequence judging a plurality of subscriber equipmenies and send different and distinguish different user after, by detecting the displacement index of second sequence that described different user devices sends, parse described different user devices relevant information separately respectively;
Node B is not as first sequence judging a plurality of subscriber equipmenies and send not simultaneously in described step (c), it then is described user equipment allocation resource, and detect the displacement index of second sequence that described subscriber equipment sends, separate out the relevant information of described subscriber equipment according to this displacement exponential solution.
6. method as claimed in claim 2 is characterized in that,
In the described step (a), described Node B informs that with broadcast mode the resource information of subscriber equipment also comprises having the optional mode information index of described correlation operation resource information, and subscriber equipment is known the optional mode of described correlation operation from the described index resource information that receives.
7. method as claimed in claim 4 is characterized in that,
In the described step (a), described Node B informs that with broadcast mode the resource information of subscriber equipment also comprises the index resource information, this index resource information comprises optional displacement index and corresponding subscriber equipment relevant information thereof, subscriber equipment is known optional displacement index and corresponding subscriber equipment relevant information thereof from described index resource information, described subscriber equipment is displacement index as its second sequence correspondence of picked at random from optional displacement index.
8. as claim 2 or 5 described methods, it is characterized in that,
The relevant information of described subscriber equipment is a kind of or its combination in user device attribute information, business information and the channel information.
9. method as claimed in claim 4 is characterized in that,
Described displacement increment time corresponding is greater than the maximum delay extended protection time of default.
10. the method for claim 1 is characterized in that,
In described step (c), Node B then is the corresponding resource of described user equipment allocation on same time-domain resource as when not detecting the first identical sequence.
11. the method for claim 1 is characterized in that,
In described step (c), first sequence and second sequence homogeneous phase while that Node B sends on same running time-frequency resource as detecting a plurality of subscriber equipmenies, then do not return response to these subscriber equipmenies.
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| CN1342348A (en) * | 2000-01-14 | 2002-03-27 | 松下电器产业株式会社 | Radio base station device and radio communication method |
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