CN100433900C - Method for dynamic adjusting leading detection threshold of access - Google Patents
Method for dynamic adjusting leading detection threshold of access Download PDFInfo
- Publication number
- CN100433900C CN100433900C CNB200410103612XA CN200410103612A CN100433900C CN 100433900 C CN100433900 C CN 100433900C CN B200410103612X A CNB200410103612X A CN B200410103612XA CN 200410103612 A CN200410103612 A CN 200410103612A CN 100433900 C CN100433900 C CN 100433900C
- Authority
- CN
- China
- Prior art keywords
- probability
- detection
- threshold
- preamble
- access
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention relates to a dynamic adjusting method for accessing a preamble detection threshold, which comprises the steps that A. a threshold T1 of preamble detection false alarm probability P1 is preset as a lowest threshold of a detection threshold T; B. a probability threshold P2 which makes message demodulating resources not enough is determined according to the preamble detection false alarm probability P1, and preamble detection probability P3 of users in a period is counted in cyclicity; C. whether the preamble detection probability P3 is greater than the probability threshold P2 is judged; if the preamble detection probability P3 is greater than the probability threshold P2, the T is adjusted to be T' according to the ratio of the detection probability P3 and the probability threshold P2; otherwise, the T is adjusted to be a T' according to the ratio of the probability threshold P2 and the detection probability P3; the T' and the T' are the current preamble detection thresholds which change following the ratio of the P3 and the P2. The preamble detection thresholds are adjusted adaptively and dynamically by the present invention so as to reduce the increase of the preamble detection false alarm, which is caused by the change of environment and channels; therefore, the utilization of access demodulating resources of systems is effectively improved.
Description
Technical field
The present invention relates to the method that a kind of detection threshold is adjusted, particularly relate to the method that a kind of leading detection threshold of access attitude is adjusted.
Background technology
In the communication technology, subscriber equipment (UE, User Equipment) initially be connected with base station foundation by Physical Random Access Channel (PRACH, Physical Random Access Channel), request is set up dedicated channel or is sent up limited packet.The structure chart of Physical Random Access Channel PRACH comprises one or more leading (Preamble) signal (shown in 1 among Fig. 1) and a message (Message) signal (shown in 3 among Fig. 1) as shown in Figure 1.Targeting signal length is 4096chip, and the signature of 16 quadratures (Signature) can be formed 16 kinds of targeting signals, and for reducing access interference, user equipment (UE) can be selected at random according to the signature of system assignment; With the leading message that is complementary, its length is 1 or 2 frames, just 38400chip or 76800chip.Two common time slots are formed an access slot, and its length is 5120chip, and targeting signal sends and the alignment of access slot initial time.
At present, the method of adjustment of detection threshold is: in each access slot, system loads is the white Gaussian noise cancellation signal stably, without any subscriber signal send leading, by emulation and test, system statistics the detected energy of the leading reception that might sign, and described detected energy carried out rank from high to low, the energy of selecting a certain position is as system's detection of preamble thresholding, that is to say fixed threshold, such as, be 1%, promptly guaranteed 1% false-alarm thresholding.During actual detected, system at first detects the leading energy that each signature is formed, and and fixing detection threshold compare, when the energy of certain signature during greater than the thresholding set, system judges there being the targeting signal of this signature to send in this access slot, otherwise thinks do not have user equipment (UE) to send the targeting signal of this signature; Secondly, when the base station has detected the targeting signal transmission, and in the time of can be for this user's assignment messages demodulation resource, just by descending AICH Acquisition Indication Channel (AICH, AcquisitionIndicator Channel) indication (AI is caught in transmission, Acquisition Indicator) be that 1 coupling is caught indication (shown in 2 among Fig. 1), if system's assignment messages demodulation resource for it, then descending AICH Acquisition Indication Channel AICH catches indication AI indication accordingly and is set to-1.At last, do not catch indication during AI when what user equipment (UE) received any coupling, user equipment (UE) will increase power and continue to send targeting signal, receive this targeting signal or will have reached maximum number of times of transmission up to the affirmation base station; When user equipment (UE) receive with its transmission leading be complementary catch indication AI when being 1, then continue to send message signale; The coupling that receives is caught indication AI judgement and is at-1 o'clock, and message signale no longer sends.
Because system detects leading and resource demodulation message is independently, system is in each access slot, all targeting signals that the difference signature of its distribution is formed all will detect, if 16 access lead assignment messages demodulation resources for the maximum possible detection, when the message frame length is 38400chip, do not consider earlier demodulation resource configuration and the time that discharges, do not consider the different messages difference of lock in time yet, the number of resources of the message demodulation that needs altogether is 16 * (38400/5120)=120 covers, if the message frame length is 76800chip, the demodulation resource that needs should double, and has greatly increased the complexity of system design.
Once more, the setting of thresholding must consider to detect the influence of false-alarm to system, can guarantee that substantially false alarm probability is constant though fixed threshold is provided with, and satisfy system requirements, but have uncontrollable bursty interference in the actual signal, and this interference may exist all in the long period section.CDMA is the self-interference system, any instantaneous and interference at random all can bring community user to send the bigger variation of signal, even the adjustment of AGC also can't guarantee the stationarity of the instantaneous received signal of system, when being being provided with of constant thresholding, false alarm probability is no longer constant, will be greater than target value set, thus the interference of system increased.
The user is by Physical Random Access Channel (PRACH, Physical Random Access Channel) before transmission signal and system set up and initially are connected, because system can't know the information of user equipment (UE), false-alarm and the actual targeting signal that sends to detected access lead, all distribute idle message demodulation resource, duration is the duration that message sends at least, i.e. 1 frame or 2 frames, discharge resource again after finishing Deng message demodulation, send even without real message signale, also may take the message demodulation resource.So, false-alarm is to take the message demodulation resource that the PRACH channel receives to the influence of system, thereby causes the deficiency of access-in resource.
In addition, when system design, the message demodulation resource only needs limited several covers, distributes by time division multiplexing, when false alarm probability during greater than re-set target, because false-alarm increases, system is that the message demodulation resource of its distribution increases, and when sending targeting signal and normally inserting the user and detected by system, does not also have efficient resource to distribute probably, cause user's access delay to increase, the extreme case that false-alarm is more serious is that the user in the sub-district can't normally insert.
If fixedly install the higher detection threshold value, though false-alarm can reduce, the detection probability that the user inserts signal obviously descends, and the energy that needs UE to send targeting signal increases, and the also corresponding increase of system interference is not suitable for all situations.
In sum, the shortcoming of prior art is: the setting of (1) fixed threshold can not guarantee the constant of actual application environment false alarm probability, thereby can not satisfy the demand of system; (2) the message demodulation effective utilization rate of resource reduces; (3) if improve the detection threshold value that fixedly installs, though false-alarm was still lower when interference signal was arranged, but the detection probability that the user inserts signal during state no interference signal obviously descends, thereby the energy that causes subscriber equipment to send targeting signal increases, and the interference of system also increases.
Summary of the invention
The problem that the present invention solves provides the method that a kind of leading detection threshold of access attitude is adjusted, adjust the detection of preamble thresholding dynamically by self adaptation, cause the increase of detection of preamble false-alarm with minimizing because of the variation of environment and passage, thereby effectively improved the utilance of system's access demodulation resource.
For addressing the above problem, the invention provides the method that a kind of leading detection threshold of access attitude is adjusted, comprising:
The thresholding T1 of detection of preamble false alarm probability P1 is predisposed to the minimum threshold of detection threshold T;
Determine to make the probability threshold P2 of message demodulation inadequate resource and the detection of preamble probability P 3 of periodic statistics user in a period of time according to detection of preamble false alarm probability P1;
Whether judge described detection of preamble probability P 3 greater than probability threshold P2, if increase detection threshold T according to the ratio of detection probability P3 and probability threshold P2; Otherwise, reduce detection threshold T according to the ratio of probability threshold P2 and detection probability P3.
Describedly determine to make the process of the probability threshold P2 of message demodulation inadequate resource to be according to detection of preamble false alarm probability P1:
According to detecting the message demodulation number of resources N that false alarm probability P1 determines that the false-alarm needs distribute
Demand
As described message demodulation number of resources N
DemandGreater than in the system during time-multiplexed message demodulation number of resources M, the probability threshold of this moment is set to P2, and described probability threshold P2 is: P2=(M/N
Total) * a, wherein, a is a constant.
Described probability threshold P2=(M/N
TotalIn the formula of) * a, the value of described a be 0.25 o'clock for best.
Described according to detecting the message demodulation number of resources N that false alarm probability P1 determines that the false-alarm needs distribute
DemandProcess be specially:
When the access message-length is the longest, detect the times N of access lead in the timing statistics section
SigDetect the times N of attempting with all
Total
Calculate the message demodulation number of resources N that false-alarm need be distributed
Demand, its computing formula is:
N
Demand=N
Total* P1, wherein, N
TotalFor all detect the number of times of attempting, P1 is for detecting false alarm probability.
When described detection false alarm probability was meant that not having the user to insert signature signal sends, system detected the probability that the signal that bears the signature sends.
Described detection of preamble probability P 3 is: detected number of signature and the ratio that detects number of times in statistics a period of time.
Preferably, described ratio according to detection probability P3 and probability threshold P2 increases detection threshold T for T '=T+k * (P3/P2-1), wherein, T is the detection of preamble thresholding, and k is that thresholding is adjusted coefficient, and P3 is the detection probability in a period of time, and P2 is for adjusting probability.
Preferably, described ratio according to probability threshold P2 and detection probability P3 is reduced to T with detection threshold T, and "=T-k * (P2/P3-1), wherein, T is the detection of preamble thresholding, and k is that thresholding is adjusted coefficient, and P3 is the detection probability in a period of time, and P2 is for adjusting probability.
When described in the step C detection threshold T being adjusted into T and " also comprising: as detection threshold T " less than minimum threshold T1 before, the detection of preamble threshold setting is T1.
When number power increases system interference, also guarantee the normal message demodulation resource allocation that inserts of user; The dynamic adjustment of detection threshold may cause detecting the increase of false-alarm in the time of can reducing the variation of environment and passage, avoid false-alarm to the taking of message demodulation efficient resource, and has guaranteed the normal message demodulation resource allocation that inserts of user.In addition, the present invention can also effectively strengthen the robustness that the PRACH channel receives under the different application environment.
Description of drawings
Fig. 1 is the structure chart of prior art Physical Random Access Channel PRACH;
Fig. 2 is the flow chart of the method for leading detection threshold of access attitude adjustment of the present invention;
Fig. 3 is the flow chart that the best of the method for leading detection threshold of access attitude adjustment of the present invention is implemented
Embodiment
Operating principle of the present invention is: the user sets up with the base station by Physical Random Access Channel and initially is connected, the concurrent limited packet of row of serving of dedicated channel is set up in request, the base station is calculated also by energy and detection threshold compares, described detection of preamble thresholding no longer fixedly installs, but, dynamically adjust detection threshold according to current statistical conditions, make the detection probability of system and the message demodulation resource of system design be complementary, guarantee the access of normal users, farthest reduce user's access delay.Whether the base station determines to have in the access slot targeting signal to send, when the base station has detected the targeting signal transmission, and in the time of can be for this user's assignment messages demodulation resource, just by descending (AICH, Acquisition Indicator Channel) to send AI be that 1 coupling is caught indication to channel, if can not the assignment messages demodulation resource, the corresponding AI indication of descending AICH channel be set to-1.When the leading AI that is complementary of transmission that receives base station feedback as the user is 1, then continue to send message signale; The coupling AI judgement that receives is at-1 o'clock, and message signale no longer sends.
Generally, the detection threshold setting of constant false-alarm can guarantee the normal access of community user, because the influence of the various interference that environment and passage bring, may cause inserting the increase of false-alarm, system can't give the normal user of access assignment messages demodulation resource, this time, if raising detection threshold, the multi-path threshold of effective multi-path judging when perhaps improving the leading energy information of statistics, can both reduce false alarm probability, the user sends targeting signal as long as suitably improve power, still can be detected by system, though the transmitted power increase makes system interference also increase, system can detect user's normal access.
Below in conjunction with accompanying drawing the present invention is done further.
Fig. 2 is the flow chart of the method for leading detection threshold of access attitude adjustment of the present invention, comprising:
Step S11: the thresholding T1 that presets detection of preamble false alarm probability P1 is the minimum threshold of detection threshold T;
Step S12: determine to make the probability threshold P2 of message demodulation inadequate resource and the detection of preamble probability P 3 of periodic statistics user in a period of time according to detection of preamble false alarm probability P1;
Step S13: judge that whether described detection of preamble probability P 3 is greater than probability threshold P2, if, ratio according to detection probability P3 and probability threshold P2 is adjusted into T ' with detection of preamble thresholding T, and described T ' is the detection of preamble thresholding (step S14) that changes with the variation of adjusting probability P 2 ratios along with detection probability P3; Otherwise, detection threshold T is adjusted into T according to the ratio of probability threshold P2 and detection probability P 3 ", described T " is the detection of preamble thresholding (step S15) that changes with the variation of adjusting probability P 2 ratios along with detection probability P3.
In broadband CDMA system, the user sets up with the base station by Physical Random Access Channel and initially is connected, the concurrent limited packet of row of serving of dedicated channel is set up in request, at first, in described step S11, the constant false alarm probability P1 of base station sets detection of preamble, its corresponding threshold value is as minimum threshold T1, remain constant, and with the default setting of minimum threshold T1 as detection of preamble thresholding T, described constant false alarm probability is set according to system design specification demand, and different products it be provided with also different, described false alarm probability is when to be this sub-district without any the user insert signature signal and send, and system detects the probability that the signal that bears the signature sends.
Execution in step S12 then, the ratio setting of detected leading number of times and all number of attempts may cause the probability threshold of message demodulation inadequate resource in the system statistics time period, be probability threshold P2, described P2 is determined by the ratio of the number of times that detects targeting signal in the timing statistics section and all detection number of attempts.Its setting is relevant with the system design specification, and by calculate obtaining, its computational process is: when considering to insert message-length and being 2 frames, i.e. and 76800chip, the access number of signature that the terminal of system configuration may be selected is N
Sig, total detection times N is made by system in this time period
Total=(76800/5120) * N
SigIf the detection false alarm probability is P1, because the message demodulation resource that false-alarm need be distributed is N
Demand=N
Total* P1 works as N
DemandThe time-multiplexed message demodulation number of resources M that is provided with greater than system, perhaps both relatively near the time, system can't be the normal user resource allocation that inserts, so P2 can be set to: P2=(M/N
Total) * a is most preferred embodiment when the value of a is constant 0.25, guarantees that at least 3/4 message demodulation resource reservation is given the normal user of access.The statistics of system cycle detects the ratio of the detection number of times in all possible number of signature and this time period as detection of preamble probability P 3 in a period of time then.
Last execution in step S13 judges that whether described detection of preamble probability P 3 is greater than probability threshold P2, if P3 is greater than P2, that is to say, having uncontrollable signal to disturb in the system increases, and the detection false-alarm of system also increases, and therefore needs to adjust the detection threshold of targeting signal; Otherwise, there is not uncontrollable signal to disturb in the system, or the signal-to-jamming ratio that exists hour, to judge that also whether current detection threshold is greater than minimum threshold T1, if the current detection thresholding is greater than minimum threshold T1, then current detection threshold is set at the detection of preamble thresholding, otherwise the detection of preamble threshold setting is T1.Concrete deterministic process is as follows:
If P3 is greater than P2, calculate current detection of preamble thresholding T ' according to adjusting probability P 3 and detection probability P2, and detection of preamble thresholding T is adjusted into T ', the detection of preamble thresholding that described T ' changes for the variation along with detection probability P3 and adjustment probability P 2 ratios, its computing formula is: T '=T+k * (P3/P2-1), wherein, T is current detection of preamble minimum threshold, k is that thresholding is adjusted coefficient, it is a variable that described thresholding is adjusted coefficient k, when it is provided with scope when 0.25dB is between 0.5dB, the thresholding adjustment can be followed the tracks of the variation of false-alarm effectively, because thresholding is adjusted the too high bigger power ramp of user that causes normally inserting, P3 is the detection probability in a period of time to solve, and P2 is for adjusting probability; Because this step has been adjusted detection threshold to detection threshold dynamically according to active user's demand, efficiently solve because the increase of interference signal, cause the increase of invalid detection, improved detection threshold, lowered false alarm probability user assignment messages demodulation resource, the message demodulation a resource shrinkage that it takies, thus system can make the signal that inserts the user normally insert (being step S14).If P3 is not more than P2, then calculate current detection of preamble thresholding T according to adjusting probability P 2 and detection probability P3 "; and just detection of preamble thresholding T is adjusted into T ", described T " is the current detection of preamble thresholding that changes along with detection probability P3 and the variation of adjusting probability P 2 ratios; its computing formula is: T "=T-k * (P2/P3-1), wherein, T is current detection of preamble thresholding, k is that thresholding is adjusted coefficient, it is a variable that described thresholding is adjusted coefficient k, when it is provided with scope when 0.25dB is between 0.5dB, the thresholding adjustment can be followed the tracks of the variation of false-alarm effectively, because thresholding is adjusted the too high bigger power ramp of user that causes normally inserting, P3 is the detection probability in a period of time to solve, and P2 is for adjusting probability.
Also see also Fig. 3, the flow chart of the most preferred embodiment of the method for adjusting for leading detection threshold of access attitude of the present invention.This scheme is optimized on the basis to the technical scheme of described Fig. 2.The computational process that is to say before execution in step S15: earlier judge current leading thresholding T according to the ratio calculation of probability threshold P2 and detection probability P3 " (step S16); T among its computational process and Fig. 2 " is identical, here do not giving unnecessary details, judge current leading thresholding T then " whether greater than minimum threshold T1 (step S 17); if; T is adjusted into T with the detection of preamble thresholding " (step S15), otherwise, detection of preamble thresholding T is adjusted into T1 (step S18); When this step is disturbed minimizing at system burst,, improved the detection probability of system, reduced the access signal and send the influence of higher-wattage system to the validated user signal by reducing detection threshold.That is to say, the detection threshold of described PRACH lead signal no longer fixedly installs, but, dynamically adjust detection threshold according to current statistical conditions, the more considerations of the setting of detection threshold detect the influence of false-alarm variation to system, when thereby the uncontrollable bursty interference of the system that efficiently solves changes, balance between false-alarm and the detection probability that is to say, detection threshold is low more, detection probability is just big more, and false alarm probability is also just big more; Detection threshold is high more, and detection probability is just more little, and false alarm probability is also just more little.Make the detection probability of system and the message demodulation resource of system design be complementary, guarantee the access of normal users, farthest reduce user's access delay.
In implementation procedure of the present invention, it is leading that user equipment (UE) selects a signature (Signature) to form at random, according to open Loop Power control, initial transmission power is set.Described initial transmission power is realized by agreement itself, inform the Common Pilot Channel transmitted power and measure the Common Pilot Channel received power by system, determine path loss, add system's present load and demodulation ability information, Initial Trans is set.Each energy information that may sign is collected in the base station in the time of access slot, when this energy surpassed leading thresholding, system just judged that the user profile that bears the signature will send.That is to say, when the base station has detected the targeting signal transmission, and in the time of can be for this user's assignment messages demodulation resource, just send and catch indication (AI by descending AICH Acquisition Indication Channel, Acquisition Indicator) be that 1 coupling is caught indication, if can not the assignment messages demodulation resource, descending AICH Acquisition Indication Channel AICH catches indication AI indication accordingly and is set to-1.If user equipment (UE) receive the transmission of base station feedback leading be complementary to catch indication AI be 1 o'clock, then continue to send message signale; Judgement is at-1 o'clock if the coupling that receives is caught indication AI, and message signale no longer sends.
Certainly user equipment (UE) send leading and message the time follow strict sequential definition, but because different user devices UE can select access slot at random in the sub-district, for the base station, each access slot all may receive the targeting signal that user equipment (UE) sends, only detect targeting signal and send to catch accordingly and indicate AI to be designated as at 1 o'clock, just the message signale that may send the subsequent user equipment UE carries out demodulation.System detects leading and resource demodulation message is independently, system is in each access slot, all targeting signals that the difference signature of its distribution is formed all will detect, by dynamic adjustment detection of preamble thresholding, compared with prior art efficiently solve the problem of message demodulation inadequate resource, the less complexity of system design.Because in the middle of practical application, Physical Random Access Channel PRACH holding time is short, compare with dedicated channel, actual volume is not high, the physics of the reserving message demodulation resource of access channel PRACH immediately is fewer, generally only provide a few cover message demodulation resources according to user's request, allow different user devices UE share by time division multiplexing, when the message demodulation resource occupied, when having new access lead to be detected again, the descending indication AI that catches also just is assigned as-1, allows user equipment (UE) suspend and sends physics access channel PRACH channel immediately, avoid it to continue soaring power and send targeting signal, thereby reduce its interference system.
The present invention is in the middle of using, consider the randomness of multi-user's received signal and system receive in the adjustment of radio-frequency channel AGC, baseband receiving signals generally all is a stable Gaussian white noise signal, system is at first according to constant false alarm probability, the minimum threshold of detection of preamble thresholding is set, the setting of described minimum threshold is a basis: when the signature signal transmission is inserted without any the user in this sub-district, system loads is the white Gaussian noise cancellation signal stably, collection by system's detected energy, greater than the energy of the false alarm probability ratio minimum threshold as detection threshold, false alarm probability was constant when system can guarantee the stationary noise input to leading detection from the energy rank.But the actual signal that the base station receives is subjected to influence of various factors, such as: the fluctuation of subscriber signal burst, the interference of other communication system leakage signal, clutter interference etc., and also this interference may all exist in the long period section.Particularly broadband CDMA system WCDMA is the self-interference system, any instantaneous and interference at random all can bring community user to send the bigger variation of signal, for this reason, the present invention proposes dynamically to adjust the detection of preamble thresholding, to solve increase owing to false-alarm, and cause the deficiency of demodulates information resource, the message demodulation resource of system's detection probability and system design is complementary, thereby has improved the effective rate of utilization of system's access-in resource.
The present invention is according to the current statistical conditions that the user received the signature energy, when having uncontrollable signal to disturb increase in the system, the detection false-alarm of system also increases, the present invention is by the adjustment to the leading detection threshold of access attitude, when the various interference effects of system reduce, reduced the setting of detection of preamble thresholding, can at utmost reduce and insert the interference of signal power increase, guaranteed the normal message demodulation resource allocation that inserts of user simultaneously system.In addition, the dynamic adjustment of detection threshold can reduce the increase that causes detecting false-alarm because of the variation of environment and passage, avoids false-alarm to the taking of message demodulation efficient resource, and has guaranteed the normal message demodulation resource allocation that inserts of user.Therefore, the leading detection threshold of access attitude is adjusted, and makes system under the different application environment, can effectively strengthen the robustness that the PRACH channel receives.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1, a kind of method of leading detection threshold of access attitude adjustment is characterized in that, comprising:
A, the thresholding T1 of detection of preamble false alarm probability P1 is predisposed to the minimum threshold of detection threshold T;
B, determine to make the probability threshold P2 of message demodulation inadequate resource and the detection of preamble probability P 3 of periodic statistics user in a period of time according to detection of preamble false alarm probability P1;
C, whether judge described detection of preamble probability P 3, if increase detection threshold T according to the ratio of detection probability P3 and probability threshold P2 greater than probability threshold P2; Otherwise, reduce detection threshold T according to the ratio of probability threshold P2 and detection probability P3.
2, the method adjusted of leading detection threshold of access attitude according to claim 1 is characterized in that, determines to make the process of the probability threshold P2 of message demodulation inadequate resource to be according to detection of preamble false alarm probability P1 among the step B:
1) according to detecting the message demodulation number of resources N that false alarm probability P1 determines that the false-alarm needs distribute
Demand
2) as described message demodulation number of resources N
DemandGreater than in the system during time-multiplexed message demodulation number of resources M, the probability threshold of this moment is set to P2, and described probability threshold P2 is: P2=(M/N
Total) * a, wherein, a is a constant.
3, the method adjusted of leading detection threshold of access attitude according to claim 2 is characterized in that step 2) described in probability threshold P2=(M/N
TotalIn the formula of) * a, the value of described a be 0.25 o'clock for best.
4, the method for leading detection threshold of access attitude adjustment according to claim 3 is characterized in that, and is described according to detecting the message demodulation number of resources N that false alarm probability P1 determines that the false-alarm needs distribute
DemandProcess be specially:
When 41) the access message-length is the longest, detect the times N of access lead in the timing statistics section
SigDetect the times N of attempting with all
Total
42) calculate the message demodulation number of resources N that false-alarm need be distributed
Demand, its computing formula is:
N
Demand=N
Total* P1, wherein, N
TotalFor all detect the number of times of attempting, P1 is for detecting false alarm probability.
5, the method for leading detection threshold of access attitude adjustment according to claim 1 is characterized in that, when described detection false alarm probability sent for there not being the user to insert signature signal, system detected the probability that the signal that bears the signature sends.
6, the method for leading detection threshold of access attitude adjustment according to claim 1 is characterized in that the probability P of detection of preamble described in the step B 3 is: detected number of signature and the ratio that detects number of times in statistics a period of time.
7, the method for leading detection threshold of access attitude adjustment according to claim 6 is characterized in that, it is T ' that described ratio according to detection probability P3 and probability threshold P2 increases detection threshold T:
T '=T+k * (P3/P2-1), wherein, T is the detection of preamble thresholding, and k is that thresholding is adjusted coefficient, and P3 is the detection probability in a period of time, and P2 is for adjusting probability.
8, the method for leading detection threshold of access attitude adjustment according to claim 7 is characterized in that described ratio according to probability threshold P2 and detection probability P3 is reduced to T with detection threshold T ":
"=T-k * (P2/P3-1), wherein, T is the detection of preamble thresholding to T, and k is that thresholding is adjusted coefficient, and P3 is the detection probability in a period of time, and P2 is for adjusting probability.
9, the method for leading detection threshold of access attitude adjustment according to claim 8 is characterized in that, described in the step C detection threshold T is adjusted into T " also comprise before:
" during less than minimum threshold T1, the detection of preamble threshold setting is T1 as detection threshold T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410103612XA CN100433900C (en) | 2004-12-29 | 2004-12-29 | Method for dynamic adjusting leading detection threshold of access |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410103612XA CN100433900C (en) | 2004-12-29 | 2004-12-29 | Method for dynamic adjusting leading detection threshold of access |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1798441A CN1798441A (en) | 2006-07-05 |
| CN100433900C true CN100433900C (en) | 2008-11-12 |
Family
ID=36819114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410103612XA Expired - Fee Related CN100433900C (en) | 2004-12-29 | 2004-12-29 | Method for dynamic adjusting leading detection threshold of access |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100433900C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006608B (en) * | 2010-11-15 | 2014-10-29 | 上海中兴软件有限责任公司 | Determination method and system as well as detection method and system of access preamble detection threshold |
| CN103297999B (en) * | 2012-02-22 | 2017-11-24 | 中兴通讯股份有限公司 | Adjust the method and device of dispatch request false-alarm threshold value |
| CN113038514B (en) * | 2021-03-24 | 2022-09-13 | 中国科学院计算技术研究所 | Self-adaptive method of 5G PRACH peak detection algorithm |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030058171A (en) * | 2001-12-29 | 2003-07-07 | 엘지전자 주식회사 | Transmission signal decision method for mobile communication system |
| CN1534908A (en) * | 2003-03-28 | 2004-10-06 | 中国科学技术大学 | Frame timing synchronization method of orthogonal frequency division multiplex signal |
| DE10315044A1 (en) * | 2003-04-02 | 2004-10-14 | Siemens Ag | Procedure for the transmission between base station and terminal e.g. for UMTS, dividing successive transferred given time slots of radio link and where timeslots are combined into transmission framework |
-
2004
- 2004-12-29 CN CNB200410103612XA patent/CN100433900C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030058171A (en) * | 2001-12-29 | 2003-07-07 | 엘지전자 주식회사 | Transmission signal decision method for mobile communication system |
| CN1534908A (en) * | 2003-03-28 | 2004-10-06 | 中国科学技术大学 | Frame timing synchronization method of orthogonal frequency division multiplex signal |
| DE10315044A1 (en) * | 2003-04-02 | 2004-10-14 | Siemens Ag | Procedure for the transmission between base station and terminal e.g. for UMTS, dividing successive transferred given time slots of radio link and where timeslots are combined into transmission framework |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1798441A (en) | 2006-07-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2426111C (en) | Ranging method for mobile communication system based on orthogonal frequency division multiple access scheme | |
| EP2070380B1 (en) | Method for reducing intra-cell interference between cell phones performing random access | |
| CN101116265B (en) | Wireless device and sending power control based interfere preventing method | |
| EP2345275B1 (en) | Cognitive radio communication terminal and method for detecting collision using feature detection | |
| CN102404724B (en) | User filtering method and base station for user filtering | |
| US20070064666A1 (en) | Method of allocating resources and method of receiving the allocated resources in a communication system | |
| CN108093436A (en) | A kind of Adaptive Rate Shape method of LPWAN Internet of Things based on Network status | |
| CN101098297B (en) | Random access method and pilot code extending method | |
| CN101203029B (en) | Method for implementation of random accessing and base station | |
| CN102548014A (en) | Network access method of machine-to-machine (M2M) communication terminals | |
| CN105472753A (en) | Cognitive small-cell dual resource allocation and disturbance management method based on LTE | |
| US8879412B2 (en) | Adaptation of cyclic shift for random access preambles | |
| CN101960894A (en) | Radio communication system, communication device, radio communication network system and method therefor | |
| KR20180058662A (en) | Method for collision avoidance in synchronized wireless communication system | |
| EP2163043B1 (en) | Random access collision detection | |
| CN109587812A (en) | Random access parameter determines method and device | |
| CN109392071A (en) | A kind of method and device of power control | |
| CN100433900C (en) | Method for dynamic adjusting leading detection threshold of access | |
| CN1859036B (en) | Regulating method and its device for physically random cut-in channel judging threshold | |
| CN101335981B (en) | Carrier distribution method of tri-carrier TD-SCDMA system | |
| KR20090129325A (en) | Communication system for grouping random access preamble | |
| US20200008151A1 (en) | User node, network node and methods for allocating and using resources for control signals | |
| CN101931963B (en) | Multi-user ranging detection and collision processing method and device | |
| CN100407865C (en) | Method, system and apparatus for controlling, trapping and indicating channel transmitting power | |
| CN101926213B (en) | Method and arrangement for allocation of E-DCH common resources in telecommunication system |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081112 Termination date: 20191229 |