CN101248593B - 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
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- 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]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
- H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
- H04W74/0858—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment collision detection
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
Technical field
The present invention relates to the method that user in a kind of mobile communication system inserts detection at random, particularly relate to a kind of in third generation TD-SCDMA mobile communication system, be used to improve user's access rate based on time division duplex insert the method that detects the conflict reprocessing at random.
Background technology
The 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, wherein user's quality of inserting the detection algorithm performance directly has influence on correctly access of radio network of user, and wrong simultaneously user inserts decline and the resource waste that judgement (comprise the mistake access when mistake when no UE inserts inserts judgement and the collision of multi-user's ascending pilot frequency sign indicating number adjudicate) will directly cause systematic function.
According to the 3GPP agreement, sub-district of regulation TD-SCDMA system is divided into that to join 8 ascending pilot frequency sign indicating numbers (be quadrature or quasi-orthogonal pseudo random sequence code on it, be expressed as SYNC_UL), optional one of them the ascending pilot frequency sign indicating number of subscriber terminal equipment (UE) is initiated random access procedure at uplink pilot time slot (UpPTS), base station (Node B) detects the up access information of UE by series of algorithms, and by physical channel FPACH (fast physical layer forward access channel) necessary control information is sent to UE in 4 subframes afterwards.Have only when UE receives relevant information from selected FPACH (with the corresponding FPACH of selected ascending pilot frequency sign indicating number) in the official hour interval after, could go up at corresponding physical channel PRACH (physical layer Random Access Channel) and send RRC (Radio Resource control) access request message, otherwise UE will carry out the re-transmission of ascending pilot frequency sign indicating number, and the re-transmission meeting selects an ascending pilot frequency sign indicating number to carry out behind a random delay once more at random.
Chinese patent specification " a kind of be used to detect the method that user terminal inserts at random " (number of patent application: 03119174.6; Publication number: CN1533199A; Open day: on September 29th, 2004) disclose a kind of method that user terminal inserts at random that is used to detect: the base station was carried out associative operation with the accidental access signal order of the synchronization that receives with each ascending pilot frequency sign indicating number, obtains corresponding correlated results window; Then, find out the maximal correlation peak value point in the correlated results window, and then mark off the front and back side window on correlation peak window, both sides; Then, given one or more thresholding, with in the correlation peak window or with correlation peak window and front and back side window in corresponding correlated results carry out the relatively judgement of one or more conditions, when satisfying condition, the pseudo random sequence code of determining the correlated results window associative operation of participation correspondence in the above-mentioned steps is the selected pseudo random sequence code of this moment access user terminal, thereby detects each terminal that inserts at random.This method has good detection effect under the situation that the synchronization user selects the ascending pilot frequency sign indicating number not clash, still, it can not detect conflict.
Thereby, Chinese patent specification " a kind of be used to detect the multiple users method of access interference at random " (number of patent application: 03119189.4; Publication number: CN1533203A; Open day: on September 29th, 2004) disclose a kind of multiple users method of access interference at random that is used to detect, this method is last patent application (" a kind of be used to detect the method that user terminal inserts at random ", number of patent application: on the basis 03119174.6), by be provided with thresholding with in peak value and the correlated results window except that the correlation peak window in the side window corresponding correlated results carry out condition relatively, when satisfying condition, determining the pseudo random sequence code that participates in correlated results window associative operation in the above-mentioned steps is selected to insert by a plurality of user terminals at random, and exist two or more UE to select identical pseudo random sequence code and same base station to make the access interference problem that inserts at same frame, but because this method has adopted collision detection method inserting at random in the testing process, be about to the more high-power tap judgement in addition of related power tap sequence peak value window and be multi-user conflict, thereby the multidiameter delay expansion that has caused 3GPP test channel case2 and similar case2 is very big and the actual wireless channel circumstance of energy even under user's access rate very low, its reason has many time delays to disperse and the approaching multipath of power when being through the subscriber signal arrival base station of this class channel, and this makes that nearly all subscriber signal all can be mistaken for multi-user conflict and refuse access in the random access procedure of this method of employing.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of method that inserts detection conflict reprocessing at random of the user's of raising access rate, adopt this method can under the prerequisite that does not reduce the collision detection probability, improve user's access rate greatly, and then strengthen the performance and the treatment effeciency of mobile communication system.
In order to solve the problems of the technologies described above, the invention provides a kind of method that inserts detection conflict reprocessing at random of the user's of raising access rate, in the mobile communication system that is applied to form by at least one base station and one group of user terminal, one group of identical common N quadrature or quasi-orthogonal pseudo random sequence code is respectively adopted with this group user terminal in this base station, access at random as user terminal, N is a positive integer, and this method comprises the steps:
(a1) base station obtains the accidental access signal that includes at the selected pseudo random sequence code of synchronization access user terminal, and each pseudo random sequence code in the pseudo random sequence code character of this accidental access signal and base station made associative operation, obtain corresponding correlated results window respectively;
(a2) in described correlated results window, find out the correlation peak point respectively, mark off correlation peak window, preceding side window and back side window, and select for use operation to determine the selected pseudo random sequence code of access user terminal by pseudo random sequence code;
(a3) setting conflict criterion judges whether there is the tap of satisfying this conflict criterion outside window at correlation peak, if exist, judges that there is access interference in described pseudo random sequence code access, and writes down the tap position of all satisfied conflict criterions; Otherwise, judge that this pseudo random sequence code inserts successfully process ends;
(a4) setting-up time length and conflict number of times threshold value, in this follow-up time span, if detect the same pseudo random sequence code access that has access interference that number of times equates with this conflict number of times threshold value, and in the tap position that the step (a3) that is included in its corresponding correlation peak maximum tap position is outside window write down, judge that then the access interference that exists causes that by single user self multipath described pseudo random sequence code inserts successfully; Otherwise judge to have multi-user's access interference, this pseudo random sequence code inserts unsuccessful.
Further, this method also has following characteristics: the described time span span of step (a4) is 12 subframe lengths to 20 subframe lengths.
Further, this method also has following characteristics: the described conflict number of times of step (a4) threshold value is 1 or 2.
Further, this method also has following characteristics: described tap position is the relative position of correlation peak point and tap, and the precision of described tap position is 1/8 chip.
Further, this method also has following characteristics: but adopt the described associative operation of matched filtering method performing step (a1).
Further, this method also has following characteristics, and the method that marks off correlation peak window, preceding side window and back side window in the step (a2) comprises the steps:
(b1) through performance emulation and theory analysis, the front window that draws correlation peak point is long long with the back side window, and marks off the correlation peak window according to the correlation peak point;
(b2) through performance emulation and theory analysis, side window length and back side window length before drawing, and according to described correlation peak window, side window and back side window before determining.
Further, this method also has following characteristics: the front window length of described correlation peak point is 2 chips, and the back side window length of described correlation peak point is 4 chips, and described preceding side window length is 32 chips, and described back side window length is 32 chips.
Further, this method also has following characteristics, and pseudo random sequence code described in the step (a2) selects for use operation to comprise the steps:
(c1) take out a correlated results window;
(c2) setting pseudo random sequence code selects judgement threshold for use and selects criterion for use, select for use judgement threshold to compare correlated results and this pseudo random sequence code of correlation peak point size, preceding side window and back side window, select criterion for use if comparative result satisfies, the pairing pseudo random sequence code of then described correlated results window is selected for use by the user; Otherwise the pairing pseudo random sequence code of described correlated results window is not selected for use by the user.
(c3) take out next correlated results window successively, repeating step (c2) is to step (c3), until the detection of finishing all correlated results windows.
Further, this method also has following characteristics: the form of described correlated results window comprises the power form.
Further, this method also has following characteristics: described correlation peak point is prominent point in the correlated results window.
Further, this method also has following characteristics, and step (c2) comprises the steps:
(d1) determine preceding side window average power according to preceding side window, determine back side window average power according to the back side window;
(d2) obtain the difference that described correlation peak point size deducts described preceding side window average power, and described correlation peak point size deducts the difference of described back side window average power;
(d3) through performance emulation and theory analysis are set pseudo random sequence code and are selected judgement threshold for use, if described two differences are selected judgement threshold for use greater than this pseudo random sequence code respectively, judge that then the pairing pseudo random sequence code of described correlated results window selected for use by the user; Otherwise judge that the pairing pseudo random sequence code of described correlated results window do not selected for use by the user.
Further, this method also has following characteristics: it is 10dB that described pseudo random sequence code is selected judgement threshold for use.
Further, this method also has following characteristics: the described conflict criterion of step (a3) be described correlation peak point size deduct tap power difference less than predefined tap judgement threshold, described tap judgement threshold is 5.5dB.
Further, this method also has following characteristics: the form of described correlated results window comprises the amplitude form.
Further; this method also has following characteristics: described mobile communication system is the third generation TD-SCDMA mobile communication system based on time division duplex; described quadrature or quasi-orthogonal pseudo random sequence code are the ascending pilot frequency sign indicating number; the data segment, length of its accidental access signal is 256 chips, comprises the protection interval of 96 chips and the ascending pilot frequency sign indicating number time slot of 160 chips.
Compared with prior art, the present invention has the following advantages:
It is a more stable change factor slowly that the present invention has made full use of in the true wireless channel environment multipath relative time delay, and the probability of multi-user's repeated collisions is lower and position in relative time delay characteristics more at random, whether same conflict access events repeats to take place in a period of time length by detecting, judging access interference thus and be the multi-user inserts and causes or single user self multipath causes, and then make accordingly and correctly handling, therefore, adopt the present invention can under the prerequisite that does not reduce the collision detection probability, improve user's successful access rate greatly, and then improve the performance of mobile communication system.
Summary of drawings
Fig. 1 is the subframe structure schematic diagram of physical layer in the TD-SCDMA mobile communication system;
Fig. 2 is the schematic flow sheet of the specific embodiment of the present invention;
Fig. 3 is the described schematic flow sheet that detects with the reprocessing that conflicts that inserts at random of step 4 in the specific embodiment of the present invention;
Fig. 4 is the schematic flow sheet that the antithetical phrase frame counter is checked in the specific embodiment of the present invention.
Preferred forms of the present invention
In order to understand the present invention in depth, the present invention is described in detail below in conjunction with drawings and the specific embodiments.
In specific embodiments of the invention; applied mobile communication system is the TD-SCDMA mobile communcations system; the subframe structure of its physical layer as shown in Figure 1; the long 5ms of each subframe, totally 6400 chips, the uplink pilot time slot of transmission ascending pilot frequency sign indicating number is 160 chips; the descending pilot frequency time slot of transmission downlink frequency pilot code is 96 chips; protection is spaced apart 96 chips, in addition, also includes the uplink and downlink timeslot switching point.
This specific embodiment is applied to the TD-SCDMA mobile communcations system, user terminal respectively adopts one group of identical totally 8 ascending pilot frequency sign indicating number with the base station, as the access at random of user terminal, as shown in Figure 2, the concrete operations that this specific embodiment is handled at base station baseband comprise the steps:
Whether step 206 differentiates ascending pilot frequency sign indicating number index i greater than 8, if, execution in step 207, otherwise return step 203;
The data segment, length at ascending pilot frequency sign indicating number place is 256 chips, wherein, comprises the protection interval of 96 chips and the uplink pilot time slot of 160 chips.The sequence number of ascending pilot frequency sign indicating number in 8 ascending pilot frequency code characters of ascending pilot frequency sign indicating number index i (i≤8) expression base station, index conflict reprocessing event counter is represented with Cpp_counter, wherein, Cpp_counter[i] (i≤8) be expressed as the pairing conflict reprocessing of the ascending pilot frequency sign indicating number event counter that ascending pilot frequency sign indicating number index is i.
As shown in Figure 3, be that the ascending pilot frequency sign indicating number of i inserts at random and detects and the last handling process that conflicts to index in the step 204, comprise the steps:
Step 308 is judged Cpp_counter[i] whether equal 0, if, execution in step 309, otherwise execution in step 313;
Step 309 makes Cpp_counter[i]=Cpp_counter[i]+1;
Step 310 determines to satisfy the tap of the described conflict criterion of step 306, and the relative position that calculates and preserve all taps of satisfying the conflict criterion and correlation peak point is to formation rel_indices, and precision is 1/8 chip;
Step 311 is set the pairing collision counter C_counter of this conflict access events, is used to write down the number of times of follow-up similar collision, and initial value is made as 0, and threshold value is made as Ncol;
Step 312 is set the sub-frame count device SF_counter of this conflict access events correspondence, is used for length writing time, and initial value is made as Nsf, execution in step 322;
Step 313 is determined and is calculated at the correlation peak maximum power tap outside window and the relative position col_rel_index of correlation peak point;
Step 314 makes k=1, and being illustrated in number is Cpp_counter[i] clash in the access events k and clashed access events;
Step 315 is checked rel_indices[k] whether contain col_rel_index, if contain execution in step 318, otherwise execution in step 316; Wherein, rel_indices[k] expression and the individual corresponding formation rel_indices of access events that clashed of k;
Step 316 makes k=k+1, and expression has clashed access events inspection to the next one;
Step 317 judges that whether k is greater than Cpp_counter[i], if, execution in step 309, otherwise return step 315;
Step 319 judges whether the C_counter[k that satisfies condition]=Ncol, if satisfy, execution in step 320, otherwise return step 316;
Step 321 judges that this ascending pilot frequency sign indicating number successfully inserts (promptly having a user to insert), execution in step 323;
Step 322 is judged the unsuccessful access of this ascending pilot frequency sign indicating number (promptly do not have the user or have a plurality of users to insert simultaneously), execution in step 323;
Through performance emulation and theory analysis, described each parameter value is as follows, the Lp1=2 chip, the Lp2=4 chip, the Lbf=Laf=32 chip, Pd=10dB, Pc=5.5dB, the span of Ncol is 1～2, the span of Nsf is 12～20 subframes.
As shown in Figure 4, in the step 302 to conflict reprocessing event counter Cpp_counter[i] operation that corresponding sub-frame count device is carried out, comprise the steps:
Step 402 is established j=1, and the expression sequence number is the sub-frame count device of j;
Step 406 judges that whether j is greater than Cpp_counter[i], if, execution in step 407, otherwise return step 403;
Step 407 finishes.
Industrial applicibility
The present invention is the method that the retransmission mechanism at random of a kind of stability of utilizing multipath relative time delay of inserting the user and ascending pilot frequency sign indicating number is distinguished out multi-user conflict and user self multipath, adopt this method can under the prerequisite that does not reduce the collision detection probability, improve user's access rate greatly, and then improve the performance and the treatment effeciency of mobile communication system.
In addition, the present invention is not only applicable to the base station receiver of TD-SCDMA mobile communication system, but also the mobile communication system that inserts at random applicable to the pseudo random sequence code of any employing quadrature (or accurate quadrature).
Claims (17)
1. method that insert to detect the conflict reprocessing at random that improves user's access rate, in the mobile communication system that is applied to form by at least one base station and one group of user terminal, one group of identical common N quadrature or quasi-orthogonal pseudo random sequence code is respectively adopted with this group user terminal in this base station, access at random as user terminal, N is a positive integer, and this method comprises the steps:
(a1) base station obtains the accidental access signal that includes at the selected pseudo random sequence code of synchronization access user terminal, and each pseudo random sequence code in the pseudo random sequence code character of this accidental access signal and base station made associative operation, obtain corresponding correlated results window respectively;
(a2) in described correlated results window, find out the correlation peak point respectively, mark off correlation peak window, preceding side window and back side window, and select for use operation to determine the selected pseudo random sequence code of access user terminal by pseudo random sequence code;
(a3) setting conflict criterion judges whether there is the tap of satisfying this conflict criterion outside window at correlation peak, if exist, judges that there is access interference in described pseudo random sequence code access, and writes down the tap position of all satisfied conflict criterions; Otherwise, judge that this pseudo random sequence code inserts successfully process ends;
(a4) setting-up time length and conflict number of times threshold value, in this follow-up time span, the same pseudo random sequence code that has access interference inserts and the access interference number of times of this pseudo random sequence code correspondence equates with described conflict number of times threshold value if detect, and in the tap position that the step (a3) that is included in the correlation peak of this pseudo random sequence code correspondence maximum tap position is outside window write down, judge that then the access interference that exists causes that by single user self multipath described pseudo random sequence code inserts successfully; Otherwise judge to have multi-user's access interference, this pseudo random sequence code inserts unsuccessful.
2. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 1, it is characterized in that: the described time span span of step (a4) is 12 subframe lengths to 20 subframe lengths.
3. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 2, it is characterized in that: the described conflict number of times of step (a4) threshold value is 1 or 2.
4. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 3, it is characterized in that: described tap position is the relative position of correlation peak point and tap, and the precision of described tap position is 1/8 chip.
5. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 3 is characterized in that: but adopt the described associative operation of matched filtering method performing step (a1).
6. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 4 is characterized in that the method that marks off correlation peak window, preceding side window and back side window in the step (a2) comprises the steps:
(b1) through performance emulation and theory analysis, the front window that draws correlation peak point is long long with the back side window, and marks off the correlation peak window according to the correlation peak point;
(b2) through performance emulation and theory analysis, side window length and back side window length before drawing, and according to described correlation peak window, side window and back side window before determining.
7. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 6, it is characterized in that: the front window length of described correlation peak point is 2 chips, the back side window length of described correlation peak point is 4 chips, side window length is 32 chips before described, and described back side window length is 32 chips.
8. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 7 is characterized in that pseudo random sequence code described in the step (a2) selects for use operation to comprise the steps:
(c1) take out a correlated results window;
(c2) setting pseudo random sequence code selects judgement threshold for use and selects criterion for use, select for use judgement threshold to compare correlated results and this pseudo random sequence code of correlation peak point size, preceding side window and back side window, select criterion for use if comparative result satisfies, the pairing pseudo random sequence code of then described correlated results window is selected for use by the user; Otherwise the pairing pseudo random sequence code of described correlated results window is not selected for use by the user.
(c3) take out next correlated results window successively, repeating step (c2) is to step (c3), until the detection of finishing all correlated results windows.
9. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 8, it is characterized in that: the form of described correlated results window comprises the power form.
10. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 9, it is characterized in that: described correlation peak point is prominent point in the correlated results window.
11. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 10 is characterized in that step (c2) comprises the steps:
(d1) determine preceding side window average power according to preceding side window, determine back side window average power according to the back side window;
(d2) obtain the difference that described correlation peak point size deducts described preceding side window average power, and described correlation peak point size deducts the difference of described back side window average power;
(d3) through performance emulation and theory analysis are set pseudo random sequence code and are selected judgement threshold for use, if described two differences are selected judgement threshold for use greater than this pseudo random sequence code respectively, judge that then the pairing pseudo random sequence code of described correlated results window selected for use by the user; Otherwise judge that the pairing pseudo random sequence code of described correlated results window do not selected for use by the user.
12. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 11, it is characterized in that: it is 10dB that described pseudo random sequence code is selected judgement threshold for use.
13. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 9 is characterized in that: the described conflict criterion of step (a3) is that described correlation peak point size deducts the difference of tap power less than predefined tap judgement threshold.
14. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 13, it is characterized in that: described tap judgement threshold is 5.5dB.
15. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 8, it is characterized in that: the form of described correlated results window comprises the amplitude form.
16. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 8, it is characterized in that: described mobile communication system is the third generation TD-SCDMA mobile communication system based on time division duplex, and described quadrature or quasi-orthogonal pseudo random sequence code are the ascending pilot frequency sign indicating number.
17. a kind of method that inserts detection conflict reprocessing at random that improves user's access rate according to claim 16; it is characterized in that: the data segment, length of the described accidental access signal of step (a1) is 256 chips, comprising the protection interval of 96 chips and the ascending pilot frequency sign indicating number time slot of 160 chips.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2005/002085 WO2007065291A1 (en) | 2005-12-05 | 2005-12-05 | Random access collision detection postprocessing method for improving user access rate |
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| CN101248593B true CN101248593B (en) | 2011-11-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| 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 |
| CN104349492B (en) * | 2013-07-24 | 2018-03-09 | 华为技术有限公司 | Accidental access method and device |
| US9277428B2 (en) | 2014-04-29 | 2016-03-01 | Motorola Solutions, Inc. | Method and apparatus for responding to a potential mass random access event |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1463097A (en) * | 2003-05-13 | 2003-12-24 | 武汉汉网高技术有限公司 | Random access method utilized in orthographic frequency division multiple access (OFDM) system |
| CN1533203A (en) * | 2003-03-18 | 2004-09-29 | 大唐移动通信设备有限公司 | Method for detecting multiple user's terminal random cutrin conflict |
| CN1533199A (en) * | 2003-03-18 | 2004-09-29 | 大唐移动通信设备有限公司 | Method for detecting user's terminal random cut-in |
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| 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 |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1533203A (en) * | 2003-03-18 | 2004-09-29 | 大唐移动通信设备有限公司 | Method for detecting multiple user's terminal random cutrin conflict |
| CN1533199A (en) * | 2003-03-18 | 2004-09-29 | 大唐移动通信设备有限公司 | Method for detecting user's terminal random cut-in |
| CN1463097A (en) * | 2003-05-13 | 2003-12-24 | 武汉汉网高技术有限公司 | Random access method utilized in orthographic frequency division multiple access (OFDM) system |
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| CN101248593A (en) | 2008-08-20 |
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