CN1859036B - Regulating method and its device for physically random cut-in channel judging threshold - Google Patents
Regulating method and its device for physically random cut-in channel judging threshold Download PDFInfo
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Abstract
This invention discloses a method for adjusting the judgement threshold of a physical random access channel and its device to increase the usability of the access resource of the PRACH channel and the access service quality, in which, the user access situation of the PRACH channel is estimated periodically and the judgement threshold is adjusted dynamically to the PRACH channel to increase the judgement thresahold when the proportions of total user number and the user number refused to be accessed are over the preset threshold and reduce the threshold when the total user number is lower than the preset threshold.
Description
Technical field
The present invention relates to mobile communication technology, particularly the decision threshold adjustment technology of Physical Random Access Channel in the broadband CDMA system.
Background technology
3-G (Generation Three mobile communication system) Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division MultipleAccess, be called for short " WCDMA ") system owing to its strong multimedia communication capacity, high-speed data transmission speed and efficiently many advantages such as the availability of frequency spectrum gain great popularity, and become the developing goal of future mobile communications.
The channel of WCDMA can be divided into dedicated channel and common channel two big classes.Wherein, dedicated channel comprises: Traffic Channel, Separate Dedicated Control Channel, follow Dedicated Control Channel.Common channel comprises: Broadcast Control Channel, forward access channel, paging channel, Random Access Channel.These channels are mapped to corresponding physical channel by different modes, i.e. DPCH and public physical channel.And public physical channel is divided into descending public physical channel and up public physical channel.
In addition, the working method of WCDMA system is also divided two kinds, comprises Frequency Division Duplexing (FDD) (FrequencyDivision Duplex is called for short " FDD ") and time division duplex (Time Division Duplex is called for short " TDD ").
Wherein, the up public physical channel of WCDMA system under the FDD working method is Physical Random Access Channel (Physical Random Access Channel is called for short " PRACH ").The user inserts the WCDMA system at random by the PRACH channel, communicates with base-station node (Base Station is called for short " NodeB "), obtains the business that the WCDMA system provides.
On the PRACH channel, the random access procedure that carries out between user and the NodeB is to have the access way at random (time slot A LOHA) of the time slotization of quick access indication to realize with a kind of.It comprises targeting signal (Preamble) and message signale (Message) two parts.Wherein, targeting signal be by 16 complex symbols (1+j or-1-j, j is the mark of imaginary part) characteristic sequence (Signature) formed, have 16 kinds of different sequences.Theoretically, each PRACH channel allows 16 users at each access slot and inserts, and different PRACH channels is distinguished with spreading code.
In random access procedure, the user sends targeting signal as inserting request by up PRACH channel, and NodeB judges whether to allow to insert according to detected targeting signal on the PRACH channel, and at descending acquisition indicator channel (Acquisition Indicator Channel, be called for short " AICH ") go up transmission acquisition indicator (Acquisition Indicator is called for short " AI ") information to the user.Whether this AI information can be confirmation (ACK), also can be confirmation (NACK) not, indicate NodeB to allow the user to continue to send message signale respectively.
And at the NodeB end, whether NodeB detects the PRACH channel at each access slot has the user to insert.If detect targeting signal, then judge whether to allow the user to insert, and send AI information to the user by descending AICH channel.If allow the user to insert, then after sending AI information, also need in the signal that receives subsequently, detect the user and go up the message signale of sending out.
NodeB according to the PRACH channel on detected targeting signal when judging whether allow to insert, the criterion of judgement has three usually, is respectively: multi-path threshold, guide and support thresholding and insert thresholding.
Specifically, multi-path threshold is the characteristic according to radio wave transmissions, is used to select to participate in the decision threshold of the multipath signal that the RAKE reception technique receives.
So-called multipath effect has many approach when being meant the actual arrival NodeB of transmitting of user; And the NodeB side generally adopts the RAKE reception technique, is actually a kind of rake reception technique, can tell trickle multipath signal in time, and these multipath signals that distinguish are weighted adjustment respectively, make it to be combined into the signal of reinforcement.
Guiding and supporting thresholding is the decision threshold that adopts usually when the multipath signal number is counted less than the maximum receiving multipath signals of RAKE reception technique, is used for improving the receptivity of RAKE reception technique, also promptly is used to select to participate in the footpath of guiding and supporting of RAKE reception technique reception.
Inserting thresholding then is according to all energy situation and noise situations greater than the multipath signal of multi-path threshold, and the decision threshold that inserts of the access-in resource situation of system.
In actual applications, there is following problem in such scheme: the access-in resource utilance and the access service quality of PRACH channel are lower.
Cause the main cause of this situation to be, in actual applications, the resource-constrained of PRACH channel process user access simultaneously, if being provided with of decision threshold is on the low side, then will cause a large amount of virtual connections to be gone into, and may flood real user and insert request, make resource utilization ratio low, the quality of access service simultaneously is also lower.Equally, higher if decision threshold is provided with, may cause the user to insert, make system resource idle.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of physically random cut-in channel judging threshold regulating method and device thereof, makes the access-in resource utilance of PRACH channel and access service quality be improved.
For achieving the above object, the invention provides a kind of physically random cut-in channel judging threshold regulating method, comprise following steps:
Number of users that the Statistical Physics Random Access Channel successfully inserts and the number of users that is rejected access;
Described success number of users that inserts and the number of users addition that is rejected access are obtained total number of users;
Judge whether described total number of users surpasses first thresholding that presets, and whether the ratio that the described number of users that is rejected access accounts for described total number of users surpasses the ratio that number of users that second thresholding that presets or described success insert accounts for described total number of users and whether is lower than the 3rd thresholding that presets, if described total number of users surpasses first thresholding preset, and the described number of users that the is rejected access ratio that accounts for described total number of users surpasses the ratio that number of users that second thresholding that presets or described success insert accounts for described total number of users and is lower than in advance
Wherein, described success number of users that inserts and the measurement period that is rejected the number of users of access are carried out, and carry out and the relevant judgement of physically random cut-in channel judging thresholding adjustment according to the statistics in the nearest measurement period.
In this external described method, when needs improve the decision threshold of described Physical Random Access Channel, improve a step-length that presets at every turn;
If the decision threshold of described Physical Random Access Channel has has met or exceeded the 5th thresholding that presets, even then satisfied the condition that improves decision threshold, do not do further raising yet, only keep the present level of decision threshold.
In this external described method,, then need to reduce the decision threshold of Physical Random Access Channel if total number of users is less than or equal to the 4th thresholding that presets in the nearest measurement period.
In this external described method, when needs reduce the decision threshold of described Physical Random Access Channel, reduce a step-length that presets at every turn;
If the decision threshold of described Physical Random Access Channel has reached or has been lower than the 6th thresholding that presets, even then satisfied the condition that reduces decision threshold, do not do further reduction yet, only keep the present level of decision threshold.
In this external described method, described the 4th thresholding is 0.
In this external described method, the decision threshold of described Physical Random Access Channel comprises one of following or its combination in any:
Multi-path threshold, guide and support thresholding and insert thresholding.
The present invention also provides a kind of physically random cut-in channel judging thresholding adjusting device, comprises:
Adjustment unit is used to improve or reduce the decision threshold of Physical Random Access Channel;
First counter, the number of users that is used for Physical Random Access Channel is successfully inserted carries out statistical counting;
Second counter, the number of users that is used for Physical Random Access Channel is rejected access carries out statistical counting;
Adder is used for the count results addition of described first, second counter is obtained total number of users;
Divider, be used for from the number of users that is rejected access of described second counter divided by total number of users from described adder, obtain ratio value;
First comparator, be used to judge whether total number of users from described adder has surpassed first thresholding that presets and whether surpassed second thresholding that presets from the ratio value of described divider, improves described decision threshold if then trigger described adjustment unit.
Wherein, also comprise:
Second comparator is used to judge whether the total number of users from described adder is less than or equal to the 4th thresholding that presets, if then trigger described adjustment unit and reduce described decision threshold.
In addition, also comprise:
Timer is used to send cyclical signal, triggers described first, second counter O reset, triggers first, second comparator and carries out comparing function and export comparative result.
Can find that by comparing the main distinction of technical scheme of the present invention and prior art is that the user of periodic statistics PRACH channel inserts situation, and dynamically adjust the decision threshold of PRACH channel according to statistics.The ratio that accounts for total number of users at total number of users, the number of users that is rejected access all improves decision threshold in limited time above preset gate.Be lower than preset gate at total number of users and reduce decision threshold in limited time.
Difference on this technical scheme has brought comparatively significantly beneficial effect, and promptly the decision threshold of PRACH channel can be adjusted to the best or approaching best numerical value adaptively.
Surpass the decision threshold that preset gate improves PRACH in limited time by the ratio that accounts for total number of users at the number of users that is rejected access, the relatively low virtual connection of average power is gone into and is effectively suppressed, and the higher relatively real user of average power inserts request and can not be submerged in during a large amount of virtual connections goes into.Surpass the condition that presets thresholding by total number of users is set, make and judge that judged result is more accurate based on bigger radix.
Because have certain false alarm rate, so, then necessarily have some users' successful access if add up the long period according to 25.141 agreement PRACH channels, just have certain total number of users, if total number of users is very few, illustrate that thresholding is too high at this moment, need to reduce.
Description of drawings
Fig. 1 is the PRACH decision threshold adjusting device structural representation according to first embodiment of the invention;
Fig. 2 is the PRACH decision threshold method of adjustment flow chart according to second embodiment of the invention;
Fig. 3 is the PRACH decision threshold method of adjustment flow chart according to third embodiment of the invention;
Fig. 4 is the PRACH decision threshold method of adjustment flow chart according to four embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The PRACH decision threshold adjusting device of first embodiment of the invention as shown in Figure 1, this device comprises: adjustment unit, first counter, second counter, adder, divider, first comparator, second comparator and timer.
Specifically, adjustment unit is used to improve or reduce the decision threshold of Physical Random Access Channel.
First counter and second counter are respectively applied for the number of users that Physical Random Access Channel was successfully inserted and be rejected access and add up.
Adder is used for the count results addition of first, second counter is obtained total number of users.
Divider be used for from the number of users that is rejected access of second counter divided by total number of users from adder, obtain ratio value.
First comparator is used to judge whether total number of users from adder has surpassed first thresholding that presets and whether surpassed second thresholding that presets from the ratio value of divider, if then trigger adjustment unit and improve decision threshold.
Second comparator is used to judge whether the total number of users from adder is less than or equal to the 4th thresholding that presets, if then trigger adjustment unit and reduce decision threshold.
Timer then is used to send cyclical signal and triggers first, second counter O reset, simultaneously, triggers first, second comparator and carries out comparing function and export comparative result.First, second counter then is to count according to the timing cycle of timer.
The method that the PRACH decision threshold of second embodiment of the invention is adjusted as shown in Figure 2.In this device, according to the statistical conditions in the sub-district, set the lower limit X 5 of optimal judgement threshold value, and the total user capacity value X1 of the NodeB under this threshold value and the threshold value X2 that is rejected the ratio of user and X1, also set the fixed step size x that decision threshold once raises.
In step 201, carry out timing setting, this timing cycle can be operated according to actual conditions, for example can be made as 10 hours.
In step 202, timing arrives, and inserts the user and adds up successfully inserting the user in the sub-district and being rejected respectively, obtains the number of users that success inserts in the timing cycle and is rejected the number of users of access, will count zero clearing again, is counting preparation next time.
In step 203,, obtain total number of users with successful access customer number and be rejected the access customer number addition.
In step 204, total number of users and threshold value X1 are compared judgement, if total number of users then changes step 205 over to greater than X1, otherwise, change step 202 over to.Surpass the condition that presets thresholding by total number of users is set, make and judge that judged result is more accurate and stable based on bigger radix.
In step 205, calculate the ratio that is rejected number of users and total number of users.
In step 206, this ratio and threshold value X2 are compared, if this ratio greater than X2, then changes step 207 over to, otherwise, change step 202 over to.
In step 207, current decision threshold and threshold value X5 are compared, if current decision threshold more than or equal to X5, then keeps current decision threshold, and change step 202 over to, otherwise, change step 208 over to.
In step 208, regulate current decision threshold, make it to improve a default step-length x, and change step 202 over to.
The method of second embodiment of the invention, ratio by accounting for total number of users at the number of users that is rejected access surpasses the decision threshold that improves PRACH when presetting thresholding X2, can effectively be suppressed so that the relatively low virtual connection of average power is gone into, save system resource and insert, avoided real user to insert and flooded by a large amount of virtual connections to the higher relatively real user of average power.
The method that the PRACH decision threshold of third embodiment of the invention is adjusted as shown in Figure 3.Equally in this device, according to the statistical conditions in the sub-district, set the lower limit X 5 of optimal judgement threshold value, and the total user capacity value X1 of the NodeB under this threshold value and successfully insert the threshold value X3 of the ratio of user and X1, and also set the fixed step size x that decision threshold once raises.
Step 301 arrives step 204 with step 201 respectively to step 304.
In step 305, calculate successfully the ratio of access customer number and total number of users.
In step 306, the size of this ratio and threshold value X3 relatively, if this ratio less than X3, step 307 then, otherwise, change step 302 over to.
Step 307 and step 308 are also respectively with step 207 and step 208.
The method that the PRACH decision threshold of four embodiment of the invention is adjusted as shown in Figure 4.In this device, according to the statistical conditions in the sub-district, set the upper limit X6 of optimal judgement threshold value, and the successful access customer number of the NodeB under this threshold value threshold value X4=0 (or X4＞0) hour, because have certain false alarm rate (about one thousandth) according to 25.141 agreement PRACH channels, if so the statistics long period, then total number of users is necessarily greater than 0.If total number of users is too small, the limit value X4 that misses a gate, then explanation decision threshold this moment is provided with too highly, has caused the user normally to insert, and needs to reduce.Therefore, also being provided with the fixed step size that decision threshold once reduces is y.
Need to prove, in general, under the enough situation of PRACH access-in resource, the user inserts success always, only under the situation of PRACH access-in resource deficiency, just have unaccepted user, so the number of users that total number of users and success insert under the enough situation of PRACH access-in resource is consistent, whether present embodiment also can use the number of users of successfully access too small as Rule of judgment, and effect is identical.
Step 401 is identical with step 201.
In step 402, when timing arrives, add up successfully inserting the user, obtain total number of users in the timing cycle.
In step 403, total number of users and threshold value X4 are compared X4=0 in the present embodiment, the X4 fixed numbers that also can get other certainly.In general, the downward modulation decision threshold can make virtual connection go into increase, and is more careful, so that X4 often obtains is less.If total number of users is total number of users in this example and equals 0 smaller or equal to X4, then change step 404 over to, otherwise, change step 402 over to.
In step 404, whether judge current judging threshold smaller or equal to threshold value X6, if, then keep current decision threshold, and change step 402 equally over to, otherwise, change step 405 over to.
In step 405, current decision threshold is turned down a default step-length y, and change step 402 over to.
The decision threshold of the PRACH channel that embodiments of the present invention relate to can be multi-path threshold, guide and support thresholding or insert thresholding, perhaps can also be the combination in any in these three kinds of thresholdings.
By above-mentioned execution mode, use apparatus and method of the present invention as can be seen, the decision threshold of PRACH channel can be adjusted to the best or approaching best numerical value adaptively.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. a physically random cut-in channel judging threshold regulating method is characterized in that, comprises following steps:
Number of users that the Statistical Physics Random Access Channel successfully inserts and the number of users that is rejected access;
Described success number of users that inserts and the number of users addition that is rejected access are obtained total number of users;
Judge whether described total number of users surpasses first thresholding that presets, and whether the ratio that the described number of users that is rejected access accounts for described total number of users surpasses the ratio that number of users that second thresholding that presets or described success insert accounts for described total number of users and whether is lower than the 3rd thresholding that presets, if described total number of users surpasses first thresholding that presets, and the described number of users that the is rejected access ratio that accounts for described total number of users surpasses the ratio that number of users that second thresholding preset or described success insert accounts for described total number of users and is lower than the 3rd thresholding that presets, and then needs to improve the decision threshold of Physical Random Access Channel.
2. physically random cut-in channel judging threshold regulating method according to claim 1, it is characterized in that, described success number of users that inserts and the measurement period that is rejected the number of users of access are carried out, and carry out and the relevant judgement of physically random cut-in channel judging thresholding adjustment according to the statistics in the nearest measurement period.
3. physically random cut-in channel judging threshold regulating method according to claim 2 is characterized in that, when needs improve the decision threshold of described Physical Random Access Channel, improves a step-length that presets at every turn;
If the decision threshold of described Physical Random Access Channel has has met or exceeded the 5th thresholding that presets, even then satisfied the condition that improves decision threshold, do not do further raising yet, only keep the present level of decision threshold.
4. physically random cut-in channel judging threshold regulating method according to claim 2 is characterized in that, if total number of users is less than or equal to the 4th thresholding that presets in the nearest measurement period, then needs to reduce the decision threshold of Physical Random Access Channel.
5. physically random cut-in channel judging threshold regulating method according to claim 4 is characterized in that, when needs reduce the decision threshold of described Physical Random Access Channel, reduces a step-length that presets at every turn;
If the decision threshold of described Physical Random Access Channel has reached or has been lower than the 6th thresholding that presets, even then satisfied the condition that reduces decision threshold, do not do further reduction yet, only keep the present level of decision threshold.
6. physically random cut-in channel judging threshold regulating method according to claim 4 is characterized in that, described the 4th thresholding is 0.
7. according to each described physically random cut-in channel judging threshold regulating method in the claim 1 to 6, it is characterized in that the decision threshold of described Physical Random Access Channel comprises one of following or its combination in any:
Multi-path threshold, guide and support thresholding and insert thresholding;
Wherein, described multi-path threshold is the characteristic according to radio wave transmissions, is used to select to participate in the decision threshold of the multipath signal that the RAKE reception technique receives;
The described thresholding of guiding and supporting is the decision threshold that adopts usually when the multipath signal number is counted less than the maximum receiving multipath signals of RAKE reception technique;
Described access thresholding is according to all energy situation and noise situations greater than the multipath signal of multi-path threshold, and the decision threshold that inserts of the access-in resource situation of system.
8. a physically random cut-in channel judging thresholding adjusting device is characterized in that, comprises:
Adjustment unit is used to improve or reduce the decision threshold of Physical Random Access Channel;
First counter, the number of users that is used for Physical Random Access Channel is successfully inserted carries out statistical counting;
Second counter, the number of users that is used for Physical Random Access Channel is rejected access carries out statistical counting;
Adder is used for the count results addition of described first, second counter is obtained total number of users;
Divider, be used for from the number of users that is rejected access of described second counter divided by total number of users from described adder, obtain ratio value;
First comparator, be used to judge whether total number of users from described adder has surpassed first thresholding that presets and whether surpassed second thresholding that presets from the ratio value of described divider, improves described decision threshold if then trigger described adjustment unit.
9. physically random cut-in channel judging thresholding adjusting device according to claim 8 is characterized in that, also comprises:
Second comparator is used to judge whether the total number of users from described adder is less than or equal to the 4th thresholding that presets, if then trigger described adjustment unit and reduce described decision threshold.
10. physically random cut-in channel judging thresholding adjusting device according to claim 9 is characterized in that, also comprises:
Timer is used to send cyclical signal, triggers described first, second counter O reset, triggers first, second comparator and carries out comparing function and export comparative result.
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| EP1954087A1 (en) * | 2007-02-05 | 2008-08-06 | Nokia Siemens Networks Gmbh & Co. Kg | Method for reducing collisions and apparatus thereof |
| CN101060531B (en) * | 2007-05-17 | 2010-10-13 | 华为技术有限公司 | A method and device for avoiding the attack of network equipment |
| CN101668328B (en) * | 2008-09-05 | 2012-01-25 | 华为技术有限公司 | Random access method, random access system, evolution network base station |
| CN102111887B (en) * | 2010-02-05 | 2013-05-15 | 电信科学技术研究院 | Method for adjusting physical random access channel (PRACH) resource density and base station |
| CN102238580A (en) * | 2011-08-04 | 2011-11-09 | 大唐移动通信设备有限公司 | PRACH (Physical Random Access Channel) detecting method and equipment |
| US20200120211A1 (en) * | 2018-10-10 | 2020-04-16 | Avaya Inc. | Dynamic agent media type selection based on communication session quality of service parameters |
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| CN1394020A (en) * | 2001-06-27 | 2003-01-29 | 华为技术有限公司 | Speed control method by dynamic regulation of threshold for CDMA system |
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