Summary of the invention
The objective of the invention is to design the processing method of congested control and recovery in a kind of mobile communication system, can understand the load and the congestion condition of Radio Resource in real time, control congested rationally, effectively and handle congested recovery.
The technical scheme that realizes the object of the invention is such: the processing method of congested control and recovery in a kind of mobile communication system is characterized in that comprising:
A. detect the load of definite each time slot of cell uplink and each time slot of down link, and judge according to the testing result of each time-slot load whether each corresponding time slot is congested;
B. determine that according to being somebody's turn to do sub-district uplink and downlink link have congested number of time slots to determine the small area jam grade, and select to trigger dynamic channel allocation module, adaptive multi-rate control module, packet scheduling module, cell selecting module, admit control module, handover module to carry out congested processing according to the small area jam grade;
Whether the congested time slot that C. detects after step B handles satisfies congested recovery condition;
D. according to the number of time slots that satisfies congested recovery condition, determine the small area jam restoration grade, and select to trigger dynamic channel allocation module, adaptive multi-rate control module, packet scheduling module, cell selecting module, admit control module, handover module to carry out congested recovery processing according to the small area jam restoration grade.
Method of the present invention, be mainly used in load condition, the congestion condition of each time slot in the real-time monitoring sub-district, and determine congested or congested restoration grade according to different situations, so that after appearance is congested, take the appropriate reasonably congested scheme that deals with, handle operation with recovering accordingly when the congested recovery, make system continue to keep normal load condition.
When the present invention loads at calculation plot, be that unit carries out with the time slot, and calculate the average load factor of each time slot in certain " slip " time window, result of calculation has embodied statistical average;
The present invention in the congestion detection process, detection to as if the time slot of sub-district, and distinguish the uplink and downlink link, carry out congestion detection respectively, and that the load condition of all time slots is judged comprehensively in the comprehensive sub-district, whether detected cells takes place is congested;
Different congestion level is distinguished according to the congestion detection result by system, and the number of time slots that is in congestion state according to uplink and downlink link in the same sub-district is determined the congestion level of sub-district, as I level (accurate congested) and II level (congested).
The present invention is when congested processing, take different congested processing policies at different congestion level, as under the state of congestion level I, concrete treatment measures have triggering DCA, and (dynamic channel allocation: dynamic channel allocation) module is adjusted to other time slots with the certain user and/or triggers AMRC that (adaptivemulti-rate control: adaptive multi-rate control) module reduces the voice service message transmission rate and/or triggers PS (packet schedule: module compressed packet user's data transmission rate etc. packet scheduling), by the congested user of time slot is handled, to reduce the load of this time slot; As under the state of congestion level II, concrete treatment measures have triggering cell to select module and/or trigger the admittance control module and/or trigger handover module, thereby forbid new user or switch the user inserting this sub-district, simultaneously can adopt the concrete treatment measures of being taked under the congestion level I state, to reduce the load of congested time slot.
When the present invention detected in congested recovery, still being unit with the time slot detected the congestion state of each time slot of uplink and downlink link, and the load condition of all time slots judges whether detected cells satisfies congested returning to form in the comprehensive then sub-district.
When the present invention handles in congested recovery, the strategy that congested recovery is handled is to take different congested recovery processing policies according to the grade of the congested recovery of time slot, determine congested restoration grade according to the congested recovery number of the different time slot of uplink downlink, as congested restoration grade I level and II level; Under the state of congested restoration grade I, when congested recovery is handled, the user who carried out congested processing is recovered, concrete measure has: trigger the cancellation of DCA module the certain user is adjusted to other time slot; Perhaps trigger AMRC module recovery voice service message transmission rate; Perhaps trigger the message transmission rate of PS module recovery grouping user etc.Under the state of congested restoration grade II, can triggering cell select module; Triggering is admitted control module and is triggered handover module, thereby releasing recovers the user who carried out congested processing when congested recovery is handled simultaneously to the restriction that new user or switching user insert this sub-district.
Compare with the recovery processing method with the congested control of traditional load, congestion processing method of the present invention has following advantage:
Because in the TDD mobile communication system, the load of each sub-district can decide by the load of each time slot, thereby timeslot-based load testing method meets the characteristics of TDD system especially;
By introducing congestion level and congested restoration grade, can improve wireless resource utility efficiency guaranteeing the normal while of system loading.
Embodiment
The processing method of congested control of load of the present invention and recovery is undertaken by the classification situation, comprises the technology contents of five parts: load calculates (Fig. 1), congestion detection (Fig. 2, Fig. 3), congested processing (Fig. 4), congested recovery detects and (Fig. 5) handled in congested recovery.Below respectively in conjunction with the accompanying drawings.
Referring to Fig. 1, load is calculated as congestion detection provides basic foundation.Calculated load of the present invention is respectively that unit carries out with the time slot to uplink downlink, calculates the load condition of each time slot.
In the load calculation process:
Step 101, system periodically receives measurement data by base station report according to certain time interval, as the downlink gross power of base station, uplink interference situation etc.;
Step 102, at first differentiate the current sub-district that will calculate according to measurement data, just in M sub-district, reception be the measurement data of which sub-district, such as hypothesis is the measurement data of i sub-district in M the sub-district, below all describes at this i sub-district;
Step 103, what judgement will be calculated at present then is the uplink load or the downstream link overhead of this i sub-district, if the instantaneous load that calculates certain time slot of up link (representing with j) is then carried out to 106 by step 104, if the instantaneous load that calculates certain time slot of down link (representing with h) is then carried out (uplink and downlink link instantaneous load computational methods differences by step 107 to 109, its computational methods all adopt mature technology, do not belong to content of the present invention);
Step 104 is calculated the i sub-district in fixed length is " slip " time window of N, the average load factor L of each time slot of up link to 106
IjIts process comprises: discern certain j time slot earlier, calculate instantaneous load (or claiming time-slot load) l of i cell uplink j time slot
IjIn " slip " time window of fixed length N, every regular hour t, (being sliding step) calculates an average load factor L
Ij, promptly N result of calculation is averaged, just can obtain the average load factor L of this time slot j in the time window
Ij,
(wherein N is that sliding window is long, sliding window length be should be average number of times, k is the some intermediate variables in calculating for N time, k=1 ... N).The span of j is by the number of time slots decision of up link.
Step 107 is calculated the i sub-district in fixed length is " slip " time window of N, the average load factor L of each time slot of down link to 109
IhIts process comprises: discern certain h time slot earlier, calculate instantaneous load (or claiming time-slot load) l of i cellular downlink h time slot
IhIn " slip " time window of fixed length N, calculate once every regular hour ts (being sliding step), calculate N time altogether, then this N time result of calculation is averaged, just can obtain the average load factor L of this time slot h in the time window
Ih,
(wherein N is that sliding window is long, and k is N the some intermediate variable in the calculating, k=1 ... N).The span of h is by the number of time slots decision of down link.
The number of uplink and downlink chain time gap may be identical or inequality, the time slot calculating number that is the uplink and downlink link may be identical or inequality, is total to J time slot as up link, and down link is H time slot altogether, J and H can equate also can be unequal, viewing system situation and deciding.If tdd mode is a non-symmetrical service, the number of its uplink downlink time slot is just inequality, and it is inequality that promptly the time slot of uplink downlink calculates number.And if the TD-SCDMA pattern is a symmetrical service, the number of its uplink downlink time slot is just identical, and promptly the time slot of uplink downlink calculating number is identical.
The present invention is also undertaken by time slot congestion detection, the congestion state of each time slot is detected respectively, and also separately carry out by up link and down link for the congestion detection of time slot.During detection, investigate in the time window at one with predetermined threshold value according to each time-slot load result of calculation of uplink and downlink link respectively and compare, thereby judge the number that each time slot is whether congested and judge congested time slot.When detecting time slot when congested, be that congested grade takes different strategies to go to handle according to the congested number of time slot, detect promptly that time slot is congested, two time slots are congested, adopt processing method inequality when three time slots are congested etc. respectively.
For the congestion detection of sub-district, it is congested the load condition of all time slots in the comprehensive sub-district to judge whether detected cells takes place, and has only when all or most of uplink time slot all to occur judging that just the up link appearance of full sub-district is congested when congested.Equally, all occur judging that just the down link of full sub-district occurs congested when congested when all or most of downlink time slots.Its flow process is respectively as Fig. 2, shown in Figure 3.
Referring to Fig. 2, the congestion detection of each time slot of up link.By detection (finishing) that each time slot of certain cell uplink is loaded respectively, according to the average load factor result of calculation of each time slot each time slot is carried out whether congested judgement again by implementation step shown in Figure 1.
Step 201, each time slot average load factor L of cell uplink that input is calculated by process shown in Figure 1
Ij
Step 202 is with above-mentioned each time slot average load factor result of calculation L
IjCompare with predetermined uplink load factor threshold value (being the congestion threshold value of up link), judge L
Ij〉=uplink load factor threshold value is promptly carried out each time slot and whether is had congested judgement;
Step 205, if the average load factor of a certain time slot less than predetermined uplink load factor threshold value, it is congested to judge that then this time slot does not occur, and returns idle condition, waits for the load measurement information that receives following one-period;
Step 203, congested if the average load factor of some or several time slots, judges promptly that this one or several time slot occurs more than or equal to predetermined uplink load factor threshold value, add up congested number of time slots again and determine congestion level;
Step 204 triggers different congested processing schemes according to different congestion level, such as: dynamic channel adjustment (DCA), switching controls (HC), packet scheduling (PS) etc.
Referring to Fig. 3, the congestion detection of each time slot of down link.By detection that each time slot of down link is loaded respectively, according to the average load factor result of calculation of each time slot each time slot is carried out whether congested judgement again.
Step 301, each time slot average load factor L of cellular downlink that input is calculated by process shown in Figure 1
Ih
Step 302 is with above-mentioned each time slot average load factor result of calculation L
IhCompare with predetermined downstream link overhead factor threshold value (being down link congestion threshold value), judge L
Ih〉=downstream link overhead factor threshold value is promptly carried out each time slot of down link and whether is had congested judgement;
Step 303, if the average load factor of a certain time slot less than predetermined downstream link overhead factor threshold value, it is congested to judge that then this time slot does not occur, and returns idle condition, waits for the load measurement information that receives following one-period;
Step 304 is if the average load factor of some or several time slots is then added up congested number of time slots and judged congestion level more than or equal to predetermined downstream link overhead factor threshold value;
Step 305 triggers different congested processing schemes according to different congestion level, such as: dynamic channel adjustment (DCA), switching controls (HC), packet scheduling (PS) etc.
By the flow process of Fig. 2, Fig. 3 as can be seen, up identical with the downstream link overhead detection method.
Referring to Fig. 4, be congested handling process.Congested processing is after system receives the triggering result of congestion detection, selects suitable processing scheme according to congested grade, makes system as early as possible, as far as possible seamlessly get back to stable normal duty state.
Step 401, this congested handling process is to carry out after detecting the congestion detection status signal, triggers congested processing.
Step 402,403,405 is judged congestion level according to the congested number of time slot, makes congested processing take different strategies according to the congested number difference of time slot.Specifically, the number of time slots that is in congestion state according to uplink and downlink link in the same sub-district is determined the congestion level of sub-district exactly, such as accurate congestion state (congestion level I) and congestion state (congestion level II).Congestion level I is meant that a time slot is not congested at least in addition in up link or the down link, and congestion level I I is meant that all time slots are all congested in up link or the down link.Such as, dividing the TD-SCDMA system of (ratio 3: 3) for uplink and downlink business time-slot symmetry, congestion level I can be one, and time slot is congested or two time slots are congested, and congestion level II just is meant that three time slots all are in congestion state; And be the situation of asymmetric division for the uplink and downlink business time-slot, as in the TDD system, if establish the up n of having (n=1 ... 5) individual time slot, wherein m time slot is congested, and then the situation of m=n is congestion level II, and the situation of m<n is congestion level I.
Step 404, under the state of congestion level I, can carry out following processing to reduce the load of this time slot to the congested user of time slot, following processing method can all or part ofly adopt, comprise: trigger the DCA module, the certain user who is communicating by letter in this time slot is adjusted to other time slots; Trigger the AMRC module, reduce the voice service message transmission rate of communicating by letter in this time slot; Trigger the PS module, compress the pocket data transmission rate of communicating by letter in this time slot.
Step 406 under the state of congestion level II, can be carried out following processing to the congested user of time slot, and following processing method can all or part ofly adopt, and comprising: trigger the access thresholding of adjusting cell selecting; Forbid admitting in the control new user's access is judged, do not allow new user's access; Improve the switch decision thresholding, forbid switching the user and cut this sub-district; Trigger the load that AMRC module and PS module further reduce each time slot.
Referring to Fig. 5, for congested recovery detects and congested recovery handling process.The same with congestion detection, congested recovery detects, and also should to be unit with the time slot detect the congestion state of each time slot, and the load condition of all time slots is comprehensively judged in the comprehensive then sub-district, whether detected cells satisfy congested recovery condition.And the strategy that congested recovery is handled also should be determined according to the number of time slots that satisfies the congested recovery of time slot.
It is to be under the congested state in system that congested recovery detects, compare in a timing statistics according to load result calculated and the recovery threshold value of being scheduled to, if load result of calculation is lower than the recovery threshold value of setting, illustrative system has been eliminated congested, satisfy the sub-district and enter the congested condition that returns to form, can carry out congested recovery processing, thereby reach the effect of optimal utilization Internet resources.Concrete computational process can be referring to Fig. 1, that is: in fixed length is " slip " time window of N, each congested time slot to the uplink and downlink link calculates instantaneous load respectively one time every a sliding step, and each congested time slot of uplink and downlink link respectively calculates N time, and N is a positive integer; N instantaneous load result of calculation to each congested time slot of uplink and downlink link averages respectively, obtains the average load factor of each congested time slot of uplink and downlink link in the time window; With the average load factor of each congested time slot of uplink and downlink link of obtaining recover threshold value with uplink congestion respectively, downlink congestion recovers threshold value relatively, when less than the congested recovery threshold value of uplink and downlink, determine that this time slot satisfies congested recovery condition, otherwise determine that this time slot does not satisfy congested recovery condition.
Step 501, this congested recovery handling process return to form and carry out behind the signal detecting congestion detection, trigger congested recovery and handle.
Step 502,503,505, processing to congested recovery is similar with congested processing, the strategy that also adopt graduation, carries out step by step promptly detects when a time slot can recover or a plurality of time slot can recover or all time slot can recover, and adopts different recovery policies to handle respectively.Its detection is to judge congested restoration grade according to the congested recovery number of time slot, congested recovery is handled can be taked different recovery policies according to the number difference of the congested recovery of time slot.It is to the restriction of the congested time slot cancellation of having eliminated to its service transmission rate etc. that congested recovery is handled, and separates if all time slots all recover and closes the restriction that the sub-district is inserted.
Congested restoration grade also can have two kinds (I level, II levels) corresponding respectively accurate congested returning to form and congested returning to form.Its division is corresponding with the division of congestion level.Congested restoration grade I is meant to also have a time slot not satisfy congested recovery condition in up link or the down link at least, and congested restoration grade II is meant that all time slots all satisfy congested recovery condition in up link or the down link.Such as, divide the TD-SCDMA system of (ratio 3: 3) for uplink and downlink business time-slot symmetry, congested restoration grade I has a time slot to satisfy two time slots of congested recovery conditioned disjunction to satisfy congested recovery condition, and congestion level II just is meant that three time slots all satisfy congested recovery condition; And be the situation of asymmetric division for the uplink and downlink business time-slot, as the TDD system, n (n=1 is arranged if establish up link ... 5) individual time slot, wherein m time slot satisfies congested recovery condition, then the situation of m=n is congested restoration grade II, and the situation of m<n is congested restoration grade I.According to the congested restoration grade of this sub-district,, take different measures to handle to being in the different congested time slots that return to form.
Step 504, in congested restoration grade is under the state of I, by following technical measures the user who carried out congested processing in the congestion detection time slot is recovered, following technical measures can all carry out or select one of them to carry out, comprise: trigger the DCA module, the operation of other time slots is adjusted to the user in this time slot in cancellation; Trigger the AMRC module, recover the former voice service message transmission rate in this time slot; Trigger the PS module, recover the interior former pocket data transmission rate of this time slot etc.
Step 506, in congested restoration grade is under the state of II, by following technical measures the user who carried out congested processing in the congestion detection time slot is recovered, following technical measures can all carry out or select one of them to carry out, and comprising: trigger the former access thresholding that recovers cell selecting; During admitting and control, recovery, removes inserting new user's restriction to new user's access criterion; Recover the switch decision thresholding, remove and switch the restriction that the user inserts this sub-district; When carrying out abovementioned technology, can carry out the recovery measure of congested restoration grade I simultaneously.
By step 504,506, select suitable congested recovery processing scheme by the grade of congested recovery, make the Internet resources that utilize of system optimal, guarantee user's link-quality.
Referring to Fig. 6, be total handling process of congested control of the present invention and recovery.
Step 601 is at first carried out initialization;
Step 602 periodically receives the measured parameter data from the base station;
Step 603 is calculated the instantaneous load l of certain each time slot of cell i uplink and downlink link j, h respectively according to measured parameter data
Ij, l
Ih, and then the average load factor L of time window interior each time slot j, the h of calculating fixed length
Ij, L
Ih
Step 604 compares according to average load factor result calculated and the uplink and downlink congestion threshold value of being scheduled to then, judges whether each time slot in each uplink and downlink link of this i sub-district exists congested;
Step 605 if the average load factor result calculated of certain time slot judges then that greater than predetermined congestion threshold value this time slot is congested, is judged congestion level according to the number of congested time slot, carries out corresponding congested processing according to different congestion level.
Step 606 (can be set this section period) after the congested processing through a Measurement and Data Processing time, and whether detect in the uplink and downlink link of this cell i has time slot to satisfy congested recovery condition.
Step 607 if there is time slot to satisfy congested recovery condition, is then judged its congested restoration grade, and carries out corresponding congested recovery according to congested restoration grade and handle.
Step 608 has not been carried out congested recovery and is handled and then return if there is time slot to satisfy congested recovery conditioned disjunction.Finish this congested control and recover processing procedure, wait for the processing procedure of congested next time control and recovery.
Congested control of load among the present invention and recovery processing method are that unit carries out with the time slot, load condition and congestion condition by each time slot of uplink and downlink link in the real-time detected cells, and determine different congestion level or congested restoration grade according to congested number of time slots or congested recovery number of time slots, so that after appearance is congested, take the appropriate reasonably congested scheme that deals with, handle operation with recovering accordingly when the congested recovery, make system continue to keep normal load condition.The processing of congested control of the present invention and recovery can be carried out by the base station controller of mobile communication system.