CN101248593A - Method for accidental access detecting collision reprocessing for improving user access rate - Google Patents
Method for accidental access detecting collision reprocessing for improving user access rate Download PDFInfo
- Publication number
- CN101248593A CN101248593A CNA2005800513730A CN200580051373A CN101248593A CN 101248593 A CN101248593 A CN 101248593A CN A2005800513730 A CNA2005800513730 A CN A2005800513730A CN 200580051373 A CN200580051373 A CN 200580051373A CN 101248593 A CN101248593 A CN 101248593A
- Authority
- CN
- China
- Prior art keywords
- window
- access
- sequence code
- random sequence
- pseudo random
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 66
- 238000012958 reprocessing Methods 0.000 title 1
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 238000012805 post-processing Methods 0.000 claims abstract description 33
- 230000001174 ascending effect Effects 0.000 claims description 41
- 230000002596 correlated effect Effects 0.000 claims description 33
- 230000000875 corresponding effect Effects 0.000 claims description 32
- 238000004088 simulation Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 claims description 2
- 235000015170 shellfish Nutrition 0.000 claims 1
- 238000010295 mobile communication Methods 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/0858—Random access procedures, e.g. with 4-step access with collision treatment collision detection
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A random access collision detection postprocessing method for improving user access rate including the steps: base station operates received random access signal to obtain corresponding correlation peak window, front window and back window and determines the pseudorandom sequence code selected by access user terminal and then said base station decides whether the taps satisfying collision decision condition exists out of correlation peak window or not, if not, it decides that said pseudorandom sequence code access is successful; otherwise it decides that the collision exists in pseudorandom sequence code access records all taps positions satisfying collision decision condition and detects whether identical collision occurs again or not, and if it is, it decides that said collision is caused by individual user multipath by oneself, and that said pseudorandom sequence code access is successful; otherwise it decides that multi-user access collision exists. Said method can improve greatly user access rate without reducing collision detection probability thereby enhance performance and treatment efficiency in mobile communication system.
Description
A kind of method for the Stochastic accessing detection conflict post processing for improving user's access rate
Technical field
The present invention relates to the method that user's Stochastic accessing in a kind of GSM is detected, the method for more particularly to a kind of Stochastic accessing detection conflict post processing for being used to improve user's access rate in the third generation TD-SCDMA GSMs based on time division duplex.Background technology
TD-SCDMA system is a kind of third generation CDMA digital mobile communication system based on time division duplex, and multi-user's random access procedure is a critical process of TD-SCDMA system, can the quality of wherein user's access detection algorithm performance directly influences user correctly access wireless network, while user's access judgement of mistake（Mistake access judgement when mistake access judgement and multi-user's ascending pilot frequency code during including being accessed without UE are collided）It will result directly in the decline of systematic function and the waste of system resource.
According to 3GPP agreements, regulation TD-SCDMA system a cell distributes 8 ascending pilot frequencies codes altogether thereon（I.e. orthogonal or quasi-orthogonal pseudo random sequence code, is expressed as SYNCJJL), subscriber terminal equipment（UE) optionally one of ascending pilot frequency code is in uplink pilot time slot（UpPTS) initiating random access procedure, base station（Node B) detect UE multi-upstream access information by series of algorithms, and 4 sub- frame ins afterwards pass through physical channel FPACH (fast physical layer forward access channels）Necessary control information is sent to UE., could be in corresponding physical channel PRACH (physical layer RACHs only after UE receives relevant information in predetermined time interval from selected FPACH (FPACH corresponding with selected ascending pilot frequency code)）Upper transmission R C (wireless heterogeneous networks）Access request message, otherwise UE will carry out the re-transmission of ascending pilot frequency code, ascending pilot frequency code can be randomly choosed again after a random delay and carry out by retransmitting.
Chinese patent specification " a kind of method for detecting user terminal Stochastic accessing "（Number of patent application： 03119174.6；Publication number： CN1533199A;Publication date：On September 29th, 2004）Disclose a kind of method for detecting user terminal Stochastic accessing：The accidental access signal order of the synchronization received and each ascending pilot frequency code are carried out associative operation by base station, obtain corresponding
Correlated results window；Then, the maximum correlation peaks point in correlated results window is found out, and then marks off correlation peak window, the front and rear side window on both sides；Then, give one or more thresholdings, with in correlation peak window or correlated results corresponding with correlation peak window and front and rear side window carries out the multilevel iudge of one or more conditions, when the condition is satisfied, it is the selected pseudo random sequence code of moment access user terminal to determine the pseudo random sequence code that corresponding correlated results window associative operation is participated in above-mentioned steps, so as to detect each terminal of Stochastic accessing.This method has good Detection results in the case where synchronization user selection ascending pilot frequency code is not clashed, and still, it can not detect entry/exit conflicts.
Thus, a kind of Chinese patent specification " method for detecting multiple users random access collision " (number of patent application: 03119189.4；Publication number： CN1533203A;Publication date：On September 29th, 2004）A kind of method for detecting multiple users random access collision is disclosed, this method is in previous patent application（" a kind of method for detecting user terminal Stochastic accessing ", number of patent application：03119174.6) on the basis of, by setting thresholding by peak value and the corresponding correlated results progress condition comparison in side window in addition to correlation peak window in correlated results window, when the condition is satisfied, determine that the pseudo random sequence code for participating in correlated results window associative operation in above-mentioned steps is randomly choosed by multiple user terminals to access, and there are problems that two or more UE have selected the access interference that identical pseudo random sequence code is accessed with same base station work in same frame, but it is due to that this method employs collision detection method in Stochastic accessing detection process, it is multi-user conflict i.e. by the relatively high power tap judgement beyond related power tap sequence peak value window, so as to result in 3GPP test channelsCaSE2 and similarCaThe access rate of user is very low under the se2 multi-path delay spread very big and uniform actual wireless channel circumstance of energy, its reason is have a plurality of time delay scattered and the close multipath of power when reaching base station by the subscriber signal of this kind of channel, and this make it that nearly all subscriber signal can all be mistaken for multi-user conflict and refuse access in the random access procedure using this method.The content of the invention
The technical problem to be solved in the invention is to provide a kind of method for the Stochastic accessing detection conflict post processing for improving user's access rate, user's access rate can be greatly improved on the premise of collision detection probability is not reduced using this method, and then strengthen the performance and treatment effeciency of GSM.
In order to solve the above-mentioned technical problem, the random of user's access rate is improved the invention provides a kind of
The method of access detection conflict post processing, applied in the GSM being made up of at least one base station and one group of user terminal, the base station and this group of user terminal are respectively using the common N number of orthogonal or quasi-orthogonal pseudo random sequence code of one group of identical, Stochastic accessing as user terminal, N is positive integer, and this method comprises the following steps：
(al) base station obtains the accidental access signal included in the pseudo random sequence code selected by synchronization access user terminal, and each pseudo random sequence code in the pseudo-random sequence code character of the accidental access signal and base station is made into associative operation, respectively obtain corresponding correlated results window；
(a2) correlation peak point is found out in the correlated results window respectively, correlation peak window, preceding side window and rear side window, and the pseudo random sequence code as selected by pseudo random sequence code from operation determination access user terminal is marked off；
(a3) setting conflict criterion, judge in correlation peak outside window with the presence or absence of the tap for meeting the conflict criterion, if in the presence of the judgement pseudo random sequence code access has access interference, and records the tap positions of all satisfaction conflict criterions；Otherwise, it is determined that the pseudo random sequence code is successfully accessed, terminate this flow；
(a4) setting time length and conflict number threshold value, in the follow-up time span, if detecting the same pseudo random sequence code access of the number of times presence access interference equal with the conflict number threshold value, and the maximum tap position of its corresponding correlation peak outside window is included in step 3) in the tap position that is recorded, then judge that the access interference existed is caused by single user itself multipath, the pseudo random sequence code is successfully accessed；Otherwise judge there is multiple access conflict, pseudo random sequence code access is unsuccessful.Further, this method also has following features：Step（A4) the time span span is 12 subframe lengths to 20 subframe lengths.
Further, this method also has following features：Step（A4) the conflict number threshold value is 1 or 2.
Further, this method also has following features：The tap position is the relative position of correlation peak point and tap, and the precision of the tap position is 1/8 chip.
Further, this method also has following features：Associative operation described in step (al) can be realized using matched filtering method.
Further, this method also has following features, step（A2 marked off in) correlation peak window,
The method of preceding side window and rear side window comprises the following steps：
(M) by performance simulation and theory analysis, show that the front window length and rear side window of correlation peak point are long, and correlation peak window is marked off according to correlation peak point；
B2) by performance simulation and theory analysis, preceding side window length and rear side window length are drawn, and according to the correlation peak window, determine preceding side window and rear side window.
Further, this method also has following features：A length of 2 chip of front window of the correlation peak point, a length of 4 chip of rear side window of the correlation peak point, the preceding side window length is 32 chips, and the rear side window length is 32 chips.
Further, this method also has following features, step（A2 pseudo random sequence code is comprised the following steps from operation described in)：
(cl) a correlated results window is taken out；
(c2) setting pseudo random sequence code is from judgement threshold and selects criterion, the correlated results and the pseudo random sequence code of correlation peak point size, preceding side window and rear side window are compared from judgement threshold, if comparative result meets and selects criterion, the pseudo random sequence code corresponding to the correlated results window is selected by user；Otherwise the pseudo random sequence code corresponding to the correlated results window is not selected by user.
(c3) next correlated results window, repeat step are taken out successively（C2) to step（C3), until completing the detection to all correlated results windows.
Further, this method also has following features：The form of the correlated results window includes power form.
Further, this method also has following features：The correlation peak point is the prominent point in correlated results window.
Further, this method also has following features, step（C2) comprise the following steps-(dl) according to preceding side window determine before side window mean power, according to rear side window determination after side window mean power；
(d2) difference that the correlation peak point size subtracts the preceding side window mean power is obtained, and correlation peak point size subtracts the difference of the rear side window mean power；
(d3) performance simulation and theory analysis are passed through, setting pseudo random sequence code selects judgement threshold, if described two differences, which are respectively greater than the pseudo random sequence code, selects judgement threshold, judge that the pseudo random sequence code corresponding to the correlated results window is selected by user；Otherwise the correlated results window is judged
Corresponding pseudo random sequence code is not selected by user.
Further, this method also has following features：Described pseudo random sequence code is 10dB from judgement threshold.
Further, this method also has following features：Step（A3 the conflict criterion described in) is less than tap set in advance for the difference that the correlation peak point size subtracts tap power and differentiates that door P is blunt, and the tap judgement threshold is 5.5dB.
Further, this method also has following features：The form of the correlated results window includes amplitude form. '
Further, this method also has following features：The GSM is the third generation TD-SCDMA GSMs based on time division duplex; described orthogonal or quasi-orthogonal pseudo random sequence code is ascending pilot frequency code; the data segment, length of its accidental access signal is 256 chips, includes the protection interval and the ascending pilot frequency code time slot of 160 chips of 96 chips.Compared with prior art, it is a more stable slow change factor that there is the present invention advantages below-present invention, which to take full advantage of multipath relative time delay in true wireless channel environment, and the probability of multi-user's repeated collisions is relatively low and relative time delay position than it is more random the characteristics of, by detecting whether same conflict access events repeat to occur in a period of time length, thus it is that multiple access causes or single user itself multipath causes to judge access interference, and then make corresponding correct processing, therefore, rate is successfully accessed using what the present invention can greatly improve user on the premise of collision detection probability is not reduced, and then improve the performance of GSM.Summary of drawings
Fig. 1 is the subframe structure schematic diagram of physical layer in TD-SCDMA GSMs；Fig. 2 is the schematic flow sheet of the embodiment of the present invention；
Fig. 3 be the present invention embodiment in Stochastic accessing detection and conflict post processing described in step 4 schematic flow sheet；
Fig. 4 be the present invention embodiment in the schematic flow sheet that is checked sub-frame counter.
The preferred forms of the present invention
In order to understand the present invention in depth, below in conjunction with the accompanying drawings and specific embodiment the present invention is described in detail.
In a particular embodiment of the present invention; the GSM applied is TD-SCDMA mobile communcations systems; the subframe structure of its physical layer is as shown in Figure 1; the long 5ms of each subframe, totally 6400 chips, transmit the uplink pilot time slot of ascending pilot frequency yard for 160 chips; the descending pilot frequency time slot for transmitting downlink frequency pilot code is 96 chips; protection interval is 96 chips, in addition, also including uplink and downlink timeslot switching point.
This specific embodiment is applied to TD-SCDMA mobile communcations systems, user terminal and base station respectively use one group of identical totally 8 ascending pilot frequency codes, Stochastic accessing as user terminal, as shown in Fig. 2, this specific embodiment comprises the following steps-step 201 in the concrete operations that base station baseband is handled, and base station is obtained receives the data segment in data where ascending pilot frequency code in antenna opening subframe；
Step 202, set ascending pilot frequency code index i, and ascending pilot frequency code index i initial values are set to 1, concurrently set 8 conflict post processing event counters, and each conflict post processing event counter is set in 0,8 ascending pilot frequency code characters of base station into each ascending pilot frequency code division corresponds to a conflict to post-process event counter；
Step 203, the ascending pilot frequency code for being i will be indexed in 8 ascending pilot frequency code characters of base station with the ascending pilot frequency code place data segment progress matched filtering obtained to realize both associative operations, it is the related power results window corresponding to i ascending pilot frequency code to obtain index；
Step 204, Stochastic accessing detection and conflict last handling process are carried out to the ascending pilot frequency code indexed as i；
Step 205, by ascending pilot frequency code index i cumulative 1；
Step 206, differentiate whether ascending pilot frequency code index i is more than 8, if so, performing step 207, otherwise return to step 203;
Step 207, the subsequent treatment of Stochastic accessing is carried out；
Step 208, terminate.
Data segment, length where ascending pilot frequency code is 256 chips, wherein, include the protection interval and the uplink pilot time slot of 160 chips of 96 chips.Ascending pilot frequency code index i (i 8) represents base station
8 ascending pilot frequency code characters in ascending pilot frequency code sequence number, index conflict post processing event counter is represented with Cpp-counter, wherein, it is the conflict post processing event counter corresponding to i ascending pilot frequency code that Cpp-counter [i] (i^8), which is expressed as ascending pilot frequency code index,.
As shown in figure 3, carrying out Stochastic accessing detection and conflict last handling process to the ascending pilot frequency code indexed as i in step 204, comprise the following steps：
Step 301, judge whether index is more than 0 for conflict post processing event counter Cpp-counter [i] corresponding to i ascending pilot frequency code, if so, performing step 302, otherwise perform step 303;Step 302, sub-frame counter is operated；
Step 303, correlation peak point position P_peak-index and size P_peak is determined in related power tap sequence of the index for the related power results window corresponding to i ascending pilot frequency code, and according to performance simulation and theory analysis, determine the long Lpl of front window and the long Lp2 of rear side window of correlation peak point, so that it is determined that correlation peak window Lp (Lp=Lpl+Lp2), another sunset is foretold, according to performance simulation and theory analysis, preceding side window length Lbf and rear side window length Laf are determined, so that it is determined that preceding side window and rear side window；
Step 304, according to preceding side window, side window mean power Pavl before calculating, and according to rear side window, side window mean power Pav2 after calculating;
Step 305, setting pseudo random sequence code selects judgement threshold Pd, judges whether while meeting condition P_peak-Pavl>Pd and condition P_peak-Pav2>Pd, if so, performing step 306, otherwise performs step 322;
Step 306, tap judgement threshold Pc is set, correlation peak all power taps outside window are traveled through
Pside, determines all satisfaction conflict criterion P_peak-PSide<PCPower tap position, and be consequently formed queue Pside-indices;
Step 307, whether be not sky, if not empty, perform step 308, otherwise perform step 321 if checking queue Pside-indices;
Step 308, judge whether Cpp-counter [i] is equal to 0, if so, performing step 309, otherwise perform step 313;
Step 309, Cpp-counter [i]=Cpp_counter [i]+1 is made；
Step 310, it is determined that meeting the tap for the criterion that conflicts described in step 306, calculate and preserve the taps of all satisfaction conflict criterions and the relative position of correlation peak point to queue
In rel-indices, precision is 1/8 chip；
Step 311, collision counter C-counter corresponding to this conflict access events is set, the number of times for recording follow-up similar collision, initial value is set to 0, and threshold value is set to Ncol;
Step 312, the corresponding sub-frame counter SF-counter of this conflict access events is set, for recording time span, initial value is set to Nsf, performs step 322;
Step 313, it is determined that and calculating relative position col-rel-index in correlation peak peak power tap outside window and correlation peak point;
Step 314, make k=l, represent to have clashed access events in number for having clashed in access events k-th for Cpp-counter [i]；
Step 315, check whether rel-indices [k] contains col-rel-index, if it does, performing step 318, otherwise perform step 316;Wherein, rel-indices [k] represents the queue rel-indices corresponding with having clashed access events k-th;
Step 316,1^ is made] ^+1, represent to carry out inspection Check to next access events that clashed；Step 317, judge k whether be more than Cpp-COmiter[i], if so, performing step 309, otherwise return to step 315;
Step 318, C-counter [k] is incremented by 1;Wherein, C-counter [k] represents the collision counter C-counter corresponding with having clashed access events k-th;
Step 319, judge whether to meet condition C-COunter[k] = NC0L, if meeting, performs step 320, otherwise return to step 316;
Step 320, judge that this conflict access events is to be caused by user's multipath and not multiple access causes conflict, remove and discharge resource collision counter C-COUnter [k] and sub-frame counter SF_counter [k], post processing event counter Cpp-counter [i] successively decrease 1, perform step 321;Step 321, judge that ascending pilot frequency code is successfully accessed（There is user's access）, perform step 323；
Step 322, the unsuccessful access of ascending pilot frequency code is judged（I.e. no user has multiple users to access simultaneously）, perform step 323;
Step 323, ascending pilot frequency code index terminates for i ascending pilot frequency code detection.
By performance simulation and theory analysis, each parameter value is as follows, the chip of Lpl=2, the chip of Lp2=4, the chip of Lbf=Laf=32, Pd=10dB, the span that Pc=5.5dB, Ncol span are 12, Nsf is 12 20 subframes.
As shown in figure 4, to conflict post processing event counter Cpp-counter [i] phase in step 302
The operation that corresponding sub-frame counter is carried out, comprises the following steps-step 401, the post processing event counter Cpp that conflicts-CSub-frame counter corresponding to ounter [i] subtracts 1, and wherein sub-frame counter number is Cpp-counter [i] numerical value；
Step 402, if j=l, serial number j sub-frame counter is represented；
Step 403, whether the numerical value for checking serial number j sub-frame counter is 0, if so, performing step 404, otherwise performs step 405;
Step404, the conflict for having clashed access events access corresponding to serial number j sub-frame counter is caused by multiple access, judge that the ascending pilot frequency for the having clashed post processing event code corresponding to the sub-frame counter is successfully accessed unsuccessful, discharge the sub-frame counter, and corresponding collision counter, and Cpp-counter [i] is successively decreased 1；
Step 405, j=j+l, represents to take out next sub-frame counter；
Step 406, judge whether j is more than Cpp-counter [i], if so, performing step 407, otherwise return to step 403;
Step 407, terminate.Industrial applicibility
The method that the present invention is a kind of stability in multipath relative time delay using accessing user and the random retransmission mechanism of ascending pilot frequency code to distinguish multi-user conflict and user itself multipath, user's access rate can be greatly improved on the premise of collision detection probability is not reduced using this method, and then improve the performance and treatment effeciency of GSM.
In addition, the present invention may be not only suitable for the base station receiver of TD-SCDMA GSMs, and it could be applicable to any using orthogonal（Or it is accurate orthogonal）Pseudo random sequence code carry out Stochastic accessing GSM.
Claims (1)
- Claims1st, a kind of method for the Stochastic accessing detection conflict post processing for improving user's access rate, applied in the GSM being made up of at least one base station and one group of user terminal, the base station and this group of user terminal are respectively using the common N number of orthogonal or quasi-orthogonal pseudo random sequence code of one group of identical, Stochastic accessing as user terminal, N is positive integer, and this method comprises the following steps：(al) base station obtains the accidental access signal included in the pseudo random sequence code selected by synchronization access user terminal, and by the pseudo-random sequence code character of the accidental access signal and base station it is each ' individual pseudo random sequence code makees associative operation, respectively obtains corresponding correlated results window；(a2) correlation peak point is found out in the correlated results window respectively, correlation peak window, preceding side window and rear side window, and the pseudo random sequence code as selected by pseudo random sequence code from operation determination access user terminal is marked off；(a3) setting conflict criterion, judge in correlation peak outside window with the presence or absence of the tap for meeting the conflict criterion, if in the presence of the judgement pseudo random sequence code access has access interference, and records the tap positions of all satisfaction conflict criterions；Otherwise, it is determined that the pseudo random sequence code is successfully accessed, terminate this flow；(a4) setting time length and conflict number threshold value, in the follow-up time span, if detecting the same pseudo random sequence code access of the number of times presence access interference equal with the conflict number threshold value, and the maximum tap position of its corresponding correlation peak outside window is included in step 3) in the tap position that is recorded, shellfish I " judges that the access interference existed is caused by single user itself multipath, and the pseudo random sequence code is successfully accessed；Otherwise judge there is multiple access conflict, pseudo random sequence code access is unsuccessful.2nd, the method for a kind of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 1, it is characterised in that：Step（A4) the time span span is 12 subframe lengths to 20 subframe lengths.3rd, the method for a kind of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 2, it is characterised in that：Step（A4) the conflict number threshold value is 1 or 2.4th, the method for a kind of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 3, it is characterised in that：The tap position is the relative position of correlation peak point and tap Put, the precision of the tap position is 1/8 chip.A kind of 5, method of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 3, it is characterised in that：Step can be realized using matched filtering method（Al the associative operation described in).56, a kind of method of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 4, it is characterised in that step（A2 the method that correlation peak window, preceding side window and rear side window are marked off in) comprises the following steps：() show that the front window length and rear side window of correlation peak point are long, and mark off correlation peak window according to correlation peak point by performance simulation and theory analysis；10 (b2) draw preceding side window length and rear side window length, and according to the correlation peak window, determine preceding side window and rear side window by performance simulation and theory analysis.7th, the method for a kind of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 6, it is characterised in that：A length of 2 chip of front window of the correlation peak point, a length of 4 chip of rear side window of the correlation peak point, the preceding side window length is 32 chips, the back15 window length are 32 chips.8th, a kind of method of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 7, it is characterised in that step（A2 pseudo random sequence code is comprised the following steps from operation described in)：(cl) a correlated results window is taken out；, 20 (c2) setting pseudo random sequence codes are from judgement threshold and select criterion, by relevant peaks' value point size, the correlated results of preceding side window and rear side window and the pseudo random sequence code be compared from judgement threshold, if comparative result, which is met, selects criterion, the pseudo random sequence code corresponding to the correlated results window is selected by user；Otherwise the pseudo random sequence code corresponding to the correlated results window is not selected by user；25 (c3) take out next correlated results window, repeat step successively（C2) to step（C3), until completing the detection to all correlated results windows.9th, the method for a kind of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 8, it is characterised in that：The form of the correlated results window includes power form.10th, a kind of Stochastic accessing detection conflict for improving user's access rate according to claim 9 The method of post processing, it is characterised in that：The correlation peak point is the prominent point in correlated results window.11st, a kind of method of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 10, it is characterised in that step（C2) comprise the following steps：(dl) side window mean power before being determined according to preceding side window, side window mean power after being determined according to rear side window；(d2) difference that the correlation peak point size subtracts the preceding side window mean power is obtained, and correlation peak point size subtracts the difference of the rear side window mean power；(d3) performance simulation and theory analysis are passed through, setting pseudo random sequence code selects judgement threshold, if described two differences, which are respectively greater than the pseudo random sequence code, selects judgement threshold, judge that the pseudo random sequence code corresponding to the correlated results window is selected by user；Otherwise judge that the pseudo random sequence code corresponding to the correlated results window is not selected by user.12nd, the method for a kind of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 11, it is characterised in that：The pseudo random sequence code is 10dB from judgement threshold.13rd, the method for a kind of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 9, it is characterised in that：Step（A3 the conflict criterion described in) is less than tap judgement threshold set in advance for the difference that the correlation peak point size subtracts tap power.14th, the method for a kind of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 13, it is characterised in that：The tap judgement threshold is 5.5dB.15th, the method for a kind of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 8, it is characterised in that：The form of the correlated results window includes amplitude form.16th, the method for a kind of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 8, it is characterised in that：The GSM is the third generation TD-SCDMA GSMs based on time division duplex, and described orthogonal or quasi-orthogonal pseudo random sequence code is ascending pilot frequency code.17th, the method for a kind of Stochastic accessing detection conflict post processing for improving user's access rate according to claim 16, it is characterised in that：Step 1) described in accidental access signal data segment, length be 256 chips, protection interval and 160 chips including 96 chips ascending pilot frequency code time slot.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2005/002085 WO2007065291A1 (en) | 2005-12-05 | 2005-12-05 | Random access collision detection postprocessing method for improving user access rate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101248593A true CN101248593A (en) | 2008-08-20 |
| CN101248593B CN101248593B (en) | 2011-11-23 |
Family
ID=38122449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005800513730A Expired - Fee Related CN101248593B (en) | 2005-12-05 | 2005-12-05 | Method for accidental access detecting collision reprocessing for improving user access rate |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101248593B (en) |
| WO (1) | WO2007065291A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102984699A (en) * | 2012-12-03 | 2013-03-20 | 中国联合网络通信集团有限公司 | D2D (device-to-device) communication data processing method, equipment and system |
| CN103313274A (en) * | 2012-03-13 | 2013-09-18 | 普天信息技术研究院有限公司 | Method for inhibiting random access code false alarm |
| CN104349492A (en) * | 2013-07-24 | 2015-02-11 | 华为技术有限公司 | Random access method and device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340884B (en) * | 2010-07-26 | 2015-06-03 | 中兴通讯股份有限公司 | Base station and method for preventing random access conflicts |
| US9277428B2 (en) | 2014-04-29 | 2016-03-01 | Motorola Solutions, Inc. | Method and apparatus for responding to a potential mass random access event |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100674806B1 (en) * | 1999-12-31 | 2007-01-26 | 주식회사 케이티 | Apparatus for detecting physical layer confliction on mobile communication systems |
| KR20020053953A (en) * | 2000-12-26 | 2002-07-06 | 오길록 | Traffic Control Method of Random Access Channel in Asynchronous Wireless Communication System |
| CN1275489C (en) * | 2003-03-18 | 2006-09-13 | 大唐移动通信设备有限公司 | Method for detecting multiple user's terminal random cutrin conflict |
| CN1275485C (en) * | 2003-03-18 | 2006-09-13 | 大唐移动通信设备有限公司 | Method for detecting user's terminal random cut-in |
| CN1249942C (en) * | 2003-05-13 | 2006-04-05 | 武汉汉网高技术有限公司 | Random access method utilized in orthographic frequency division multiple access (OFDM) system |
-
2005
- 2005-12-05 CN CN2005800513730A patent/CN101248593B/en not_active Expired - Fee Related
- 2005-12-05 WO PCT/CN2005/002085 patent/WO2007065291A1/en active Application Filing
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103313274A (en) * | 2012-03-13 | 2013-09-18 | 普天信息技术研究院有限公司 | Method for inhibiting random access code false alarm |
| CN103313274B (en) * | 2012-03-13 | 2016-12-14 | 普天信息技术研究院有限公司 | A kind of method suppressing random access code false-alarm |
| CN102984699A (en) * | 2012-12-03 | 2013-03-20 | 中国联合网络通信集团有限公司 | D2D (device-to-device) communication data processing method, equipment and system |
| CN102984699B (en) * | 2012-12-03 | 2016-02-17 | 中国联合网络通信集团有限公司 | D2D processing method of communication data, equipment and system |
| CN104349492A (en) * | 2013-07-24 | 2015-02-11 | 华为技术有限公司 | Random access method and device |
| CN104349492B (en) * | 2013-07-24 | 2018-03-09 | 华为技术有限公司 | Accidental access method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007065291A1 (en) | 2007-06-14 |
| CN101248593B (en) | 2011-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1400049B1 (en) | Method for adaptively setting transmission parameters for a random access channel transmission uplink procedure in a wireless communication system | |
| US7002910B2 (en) | Receiver-initiated channel-hopping (RICH) method for wireless communication networks | |
| CN101185250B (en) | Initial multi-path acquisition of random access channels | |
| CN101690360B (en) | Ranging method and bandwidth request ranging method | |
| US6493334B1 (en) | Spread spectrum time-division multiple access communication scheme | |
| JP2007266733A (en) | Random access method, wireless terminal and wireless communication system | |
| CN102448158B (en) | Mobile terminal random access method of TD-SCDMA system | |
| US9801212B2 (en) | User equipment and method for resource allocation | |
| CN101248593A (en) | Method for accidental access detecting collision reprocessing for improving user access rate | |
| CN100401660C (en) | Detection method of user terminal random access | |
| EP1456971A1 (en) | Cell search using peak quality factors | |
| Vukovic et al. | Performance analysis of the random access channel (RACH) in WCDMA | |
| CN101136653B (en) | Random access channel multi-path searching device and method of CDMA system | |
| Thomsen et al. | Analysis of the LTE access reservation protocol for real-time traffic | |
| Chen et al. | A novel analytical model for asynchronous multi-packet reception MAC protocol | |
| CN101026390B (en) | Method for accurately determining downlink guaranteed time slot | |
| CN100377504C (en) | First-step search of initial zone in time division synchronizing CDMA system | |
| Zhai et al. | Modified 802.11‐Based Opportunistic Spectrum Access in Cognitive Radio Networks | |
| EP1492246A1 (en) | Path diversity receiver apparatus and method of spectrum spread communication system | |
| CN103581986A (en) | Channel detection method and device | |
| Choudhary et al. | Simulated performance of W-CDMA random access channel | |
| Zhang et al. | Performance analysis and simulation of code division multiple access (CDMA) cellular digital networks | |
| Kim et al. | Performance of slotted asynchronous CDMA using controlled time of arrival | |
| Sun et al. | Rapid access protocols for discontinuous transmission in DS-CDMA systems | |
| He et al. | Simple analytical model for the random access channel in WCDMA |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20080820 Assignee: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD. Assignor: ZTE Corporation Contract record no.: 2015440020319 Denomination of invention: Method for accidental access detecting collision reprocessing for improving user access rate Granted publication date: 20111123 License type: Common License Record date: 20151123 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111123 Termination date: 20191205 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |