CN101925161A - Method and device for adaptively adjusting discontinuous reception modes in wireless communication system - Google Patents
Method and device for adaptively adjusting discontinuous reception modes in wireless communication system Download PDFInfo
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Abstract
The invention discloses a method for adaptively adjusting discontinuous reception parameters of users according to conditions of a wireless channel. The method of the invention comprises the following steps: detecting the load variation of a wireless communication system; and changing the time when a user is in the activation stage in the discontinuous reception cycle according to the detected load variation. In addition, the invention can also be used for detecting the change speed of a user channel and changing the time when the user is in the activation stage in the discontinuous reception cycle according to the detected change speed of the channel.
Description
Technical field
The present invention relates to a kind of in wireless communication system the method and apparatus of self adaptation adjustment user's discontinuous reception modes, particularly, the situation that relates to according to wireless channel is provided with discontinuous reception parameters of users adaptively, thereby further improves the method and apparatus of the electric energy of discontinuous reception modes.
Background technology
(3rd Generation Partnership Project, 3GPP) vital tissue as moving communicating field has greatly promoted 3G (Third Generation) Moblie technology (The Third Generation, standardization progress 3G) to third generation partner program.3GPP has formulated a series of Wideband Code Division Multiple Access (WCDMA) that comprise and has inserted (Wide Code Division Multiple Access, WCDMA), high speed downlink packet inserts (High Speed Downlink Packet Access, HSDPA), (High Speed Uplink Packet Access HSUPA) waits in interior communication system standard in the high speed uplink packet access.In order to tackle the challenge of broadband access technology, and satisfy the demand of growing novel business, 3GPP will have started the standardization effort of 3G Long Term Evolution (LTE:Long Term Evolution) technology in the end of the year 2004, wish further to improve spectrum efficiency, improve the performance of Cell Edge User, reduce system delay, the access service of higher rate etc. is provided for the high-speed mobile user.
In above-mentioned mobile communication system, the mutual supply of information between user and the base station based on both sides' energy.For such as most battery-powered travelling carriages such as mobile phone, notebook computer, its energy reserve is limited.Therefore, thus how reducing standby and the service time that energy consumption prolongs the user is to need one of key issue of considering in the mobile communication system.
In order to realize this purpose, adopted discontinuous reception (Discontinuous Reception in the standard of 3GPP, DRX) pattern, by allowing user's monitor channel and receive downlink business in the special time period of appointing with the base station, can reduce the time of unnecessary monitor channel, reduce user's energy consumption.This DRX pattern is adopted by LTE equally.Than 3GPP standard before, though first-class slightly different in state, channel and the trigger condition of its application, the operating process of user under the DRX pattern is identical, can characterize with several specific parameters.
Fig. 1 shows the operating process of user under discontinuous reception modes.As shown in Figure 1, under the DRX pattern, user UE (portable terminal) alternately is in " active period " (Active Period) and " sleep period " (Sleep Period).In the zero hour of twice continuous active period, just the time interval between the activation period starting point (APSP:Active Period Starting Point) is called as a discontinuous receiving cycle (DRX cycle).In active period, the user opens its receiver, and (Receiver is Rx) with the information and the downlink data receiving of monitoring control channel; And in sleep period, UE does not need monitoring control channel, thereby reaches purpose of power saving.In carry out the whole standard of describing at LTE, the DRX that the user is under Radio Resource control connection (RRC_CONNECTED) state is illustrated, and provides to give a definition:
-opening the duration (on-duration): the user waits for the time that receives Physical Downlink Control Channel (PDCCH:Physical Downlink Control Channel) after waking up from the sleep period of DRX, its unit is Transmission Time Interval (TTI:Transmission Time Interval).The user is enter this unlatching duration when the DRX sleep state is waken up, if during this period of time the user successfully decodes to PDCCH, the user will keep the state of (Awake) of waking up, and start non-Active Timer (Inactivity Timer); Otherwise the user will enter the DRX sleep state under the situation that the DRX configuration allows.
-non-Active Timer (inactivity timer): wait for the time of the PDCCH that successfully decodes once more after the user successfully decodes PDCCH from the last time, its unit is TTI.If the user successfully decodes to PDCCH, the user will keep awake state, and start non-Active Timer once more, tell the user to reenter discontinuous receiving state up to certain medium access control (MAC:Medium Access Control) head or control messages, and in the MAC payload, indicate clearly the cycle of DRX; Perhaps, this user reenters discontinuous receiving state automatically according to predefined DRX cycle when non-Active Timer finishes.
-DRX cycle (DRX Cycle): institute's interlude between two adjacent unlatching duration may comprise the time that is in non-Active Timer in during this period of time
-activationary time (active time): the user is in the time of awake state, comprises unlatching duration in the DRX cycle and the time that the user receives continuously before non-Active Timer finishes.The minimum value of this activationary time equals to open the duration, and maximum without limits.In the parameter of above-mentioned definition, opening duration and non-Active Timer is the value of fixing, Universal Terrestrial Radio Access Network network enhancement mode B node (Evolved Universal Terrestrial Access Network NodeB by evolution, eNB) (base station) notifies the user to be provided with, and activationary time then depends on scheduling strategy and the user decoding success or not to PDCCH.
By above-mentioned discontinuous reception, the user does not need to continue monitor channel, and just wake up in some specific moment at intervals, thereby reduce because unnecessarily monitor channel and the not one's own data of decoding and the energy consumption that causes prolongs user's standby and service time.But discontinuous reception has also limited the reception of user to downlink data in time.For example, in Fig. 1, when the user was in sleep period, even the user might be scheduled, eNB just can dispatch this user in the time of also will waiting until this user's active period next time, and therefore, these data are delayed.That is to say that user's active period has limited the time that the user participates in dispatching; On the other hand, because the variation of channel condition, the user is lower in the possibility that some is scheduled constantly, but because the user that is arranged so that of active period wakes up constantly at this, still the not transmission of data has increased meaningless energy loss thus.Cause these two kinds of results' main cause to be, under multi-user's situation, the scheduling result of scheduler is except relevant with the activationary time that participates in dispatched users, also directly be subjected to the influence of each user radio channel conditions, so, realize more effectively power savings, just should adjust user's DRX parameter configuration adaptively, it is matched with radio channel state.
Fig. 2 and 3 shows the schematic diagram that when carrying out discontinuous the reception under the situation of different user number scheduling result is influenced respectively.Here Radio Resource is expressed as the set of two dimensional wireless Resource Block, transverse axis is represented time-domain, is unit with TTI, and the longitudinal axis is represented frequency domain, is unit with the subcarrier.Like this, in a TTI, the 2 dimensional region that the subcarrier of some (such as adopting 12 continuous sub-carriers among the LTE usually) is formed is called as a Resource Block (RB:Resource Block), the number N of Resource Block in the corresponding TTI
RBRepresent.Fig. 2 is with N
RB=2 have provided when carrying out discontinuous receive under the situation of different user number schematic diagram to the scheduling result influence for example.ENB (base station) carries out resource allocation based on such set of radio resources, and gives corresponding user data passes on corresponding resource blocks.As shown in Figure 2, suppose that four user UE1, UE2 are arranged in the current system, UE3, UE4, they are in discontinuous receiving state and have identical DRX cycle and different active periods, the monitor channel and receive one's own data of waking up in each customed time period.Each constantly eNB all can detect the user who is in active period, and when the data of pointing to them are arranged, be their Resources allocation in memory.When number of users when 4 increase to 6, as shown in Figure 3, the DRX parameter configuration of supposing the user does not change, can see that this moment user 3 (UE3) and user 4 (UE4) is owing to the competition that user 5 and 6 have been arranged, in the active period that has, do not have scheduled, wait until that next active period just can be scheduled, will make user 3,4 cause meaningless power loss like this.From system perspective, because multi-user diversity, each number of users that is in active period constantly is many more, has high more throughput of system.
Fig. 4 shows the trend schematic diagram that throughput of system changes with the change of the number of users that is in active period.As shown in Figure 4, though the throughput of system increases along with the increase of the number of users that participates in scheduling, but reach after the some when number of users, the growth of throughput of system is also not obvious, user's power consumption but with the time span that is in active period relation in direct ratio.Therefore, increase excited user number simply and can not improve throughput of system significantly, can increase user's power consumption on the contrary.In addition, the load of system is time dependent, for example, the time system that works by day duty ratio is bigger, during night system load smaller, if adopt identical DRX parameter configuration, will make that the number of users that is in active period when system load is big is too much, consume user's electric weight meaninglessly.
Fig. 5 shows the different user of channel variance situation and is provided with down at the non-Active Timer of identical DRX, the schematic diagram of active period of living in.Shown in Fig. 5 a, when user's channel variation is slow, when for example user moving speed is smaller, in certain non-Active Timer of opening, in case the user be not scheduled sometime, because the possibility that the time of back is not scheduled in the influence of channel relevancy, non-Active Timer is also bigger, promptly the possibility that is not scheduled in the Period1 is bigger.If non-Active Timer is long, this user just may be in the state that activates and be not scheduled in long time, just consumed electric weight meaninglessly.On the contrary, if non-Active Timer is set to relatively short value, then can this thing happens, and owing to, will open a non-Active Timer again, so the user can't miss the time that may be scheduled as long as the user is scheduled.Shown in Fig. 5 b, when user's channel variation compared faster, for example, when user moving speed was bigger, this user was not strong in the possibility correlation that whether is scheduled sometime Yu be scheduled in the time after this.So user's activationary time is long more, the chance that may be scheduled is many more.Like this, if according to traditional method, promptly under the situation of different channel variation speed, to the user identical non-Active Timer time span is set, can make meaningless ground of the user consumes power that channel variation is slow, and the fast user's of channel variation transmission rate is restricted, and also is that the energy-saving efficiency of DRX does not obtain better utilization.Therefore need be according to the situation of wireless channel, adaptive adjustment DRX parameter, thus obtain more efficient energy-saving effect.That is, under the situation of minimum loss of throughput, save more user's energy.
As mentioned above, the setting of Several Parameters is depended in user's discontinuous reception: open duration, non-Active Timer, DRX cycle.Wherein open duration and DRX cycle and determined the user to be in the shared ratio of time of active period to a great extent, thereby also just determined to be in the whole system at a time what of number of users of active period.Therefore,, can adjust the number of users that is in active period by adjusting DRX cycle and opening the relation of duration, thus the economize on electricity problem when the resolution system load is big.On the other hand, the time of continuous monitor channel was also influential to user's activationary time after the length of non-Active Timer had determined the user to be scheduled.Therefore, according to the non-Active Timer time span of user in the channel variation speed adjustment prior art, can improve the energy-saving efficiency under the different channels variation user mixing situation effectively.In existing technology, open duration, DRX cycle and non-Active Timer and determined by user business type usually, and not along with system load how much and the speed of channel variation adjust.Yet, from the analysis of front as can be seen, the mode of DRX parameter is set like this, can make certain customers be activated in the moment that unlikely is scheduled, expend electric weight meaninglessly, even and if another part user may still be in sleep period under the situation that may be scheduled, reduced the throughput of system.
In sum, the electric energy of traditional DRX parameter setting method has much room for improvement.Therefore need a kind of method to solve the not high problem of traditional DRX parameter setting method electric energy, make under the situation that guarantees the throughput of system requirement, save user's electric weight, prolongation user stand-by time more effectively.
Summary of the invention
An object of the present invention is to provide a kind of method and apparatus of adjusting discontinuous reception parameters of users according to the situation self adaptation of wireless channel, can be provided with according to radio channel state and open duration, non-Active Timer and DRX cycle, thereby further improve the electric energy of the discontinuous reception of user, more effectively prolong user's stand-by time.
Another object of the present invention provides a kind of method and apparatus of adjusting discontinuous reception parameters of users according to the situation self adaptation of wireless channel, can utilize the load information of system and the adjustment of channel variation speed information self-adapting to open duration, non-Active Timer and DRX cycle, thereby further improve the electric energy of discontinuous reception, more effectively prolong user's stand-by time.
According to an aspect of the present invention, provide a kind of situation self adaptation according to wireless channel to adjust the method for discontinuous reception parameters of users, described method comprises step: the load variation amount that detects wireless communication system; According to the load variation amount that detects, change the user is in active period in discontinuous receiving cycle time.
According to another aspect of the present invention, provide a kind of situation self adaptation according to wireless channel to adjust the method for discontinuous reception parameters of users, comprise step: detect the speed that subscriber channel changes; Speed degree according to subscriber channel changes changes the user is in active period in discontinuous receiving cycle time.
According to a further aspect of the invention, a kind of system that adjusts discontinuous reception parameters of users according to the situation self adaptation of wireless channel is provided, comprise: the discontinuous reception parameters calculation element, be used to obtain discontinuous reception parameters, and calculate the ratio of opening duration and discontinuous receiving cycle; The discontinuous reception parameters status register is used to the described ratio of preserving discontinuous reception parameters and being calculated; Discontinuous reception parameters configuration packages device is used for discontinuous reception parameters and the unlatching duration of calculating and the ratio of discontinuous receiving cycle are packaged into discontinuous reception configuration information; Discontinuous reception adjusting device is used for adjusting according to the discontinuous reception configuration information that receives user's discontinuous receiving state; First transmission/reception is used for launching discontinuous reception configuration information and the information that receives from the user to the user; Second transmission/reception is used to receive the discontinuous reception configuration information that described first transmission/reception sends.
According to a further aspect of the invention, a kind of system that adjusts discontinuous reception parameters of users according to the situation self adaptation of wireless channel is provided, comprise: the discontinuous reception parameters calculation element is used for calculating according to subscriber channel changing condition information user's non-Active Timer time span; The discontinuous reception parameters status register is used to the non-Active Timer time span of preserving subscriber channel changing condition information and being calculated; Discontinuous reception parameters configuration packages device is used for discontinuous reception parameters and subscriber channel changing condition information of calculating and the non-Active Timer time span of being calculated are packaged into discontinuous reception configuration information; Discontinuous reception adjusting device is used for adjusting according to the discontinuous reception configuration information that receives user's discontinuous receiving state; First transmission/reception is used for launching discontinuous reception configuration information and the information that receives from the user to the user; Second transmission/reception is used to receive the discontinuous reception configuration information that described first transmission/reception sends.
According to the present invention, adjust such as DRX cycle adaptively, open the DRX parameter duration and the non-Active Timer according to the situation of wireless channel, make user's activationary time adapt to the variation of wireless channel, avoid the user under the little situation of scheduling possibility, to activate, on bigger degree, utilized the power save properties of discontinuous reception, can obtain more efficient battery saving mode, in acceptable throughput of system loss range, obviously reduce power loss.In addition, adjust file time that will take that non-Active Timer time span can also reduce the identical size of transmission according to the channel variation speed.
Description of drawings
By below in conjunction with description of drawings the preferred embodiments of the present invention, will make above-mentioned and other purpose of the present invention, feature and advantage clearer, wherein:
Fig. 1 shows the operating process schematic diagram of user under discontinuous reception modes;
It is to the schematic diagram of scheduling result influence when carrying out discontinuous the reception at 4 o'clock at number of users that Fig. 2 shows according to prior art;
It is to the schematic diagram of scheduling result influence when carrying out discontinuous the reception at 6 o'clock at number of users that Fig. 3 shows according to prior art;
Under the DRX pattern that Fig. 4 shows in prior art, throughput of system is with the number of users variation tendency schematic diagram that is in active period;
Under the DRX pattern that Fig. 5 a and 5b show in prior art, the user of different channels situation of change is provided with the schematic diagram of active period of living in down at the non-Active Timer of identical DRX;
Fig. 6 shows the flow chart of opening the ratio between duration and the DRX cycle according to first embodiment of the present invention eNB according to the adjustment of system load situation self adaptation;
Fig. 7 shows the schematic diagram of opening the ratio between duration and the DRX cycle according to first embodiment of the present invention eNB according to the adjustment of system load situation self adaptation;
Fig. 8 shows the flow chart that speed degree self adaptation that eNB according to a second embodiment of the present invention changes according to subscriber channel is adjusted non-Active Timer time span;
Fig. 9 show according to a second embodiment of the present invention when multi-user's channel variation not simultaneously non-Active Timer schematic diagram is set;
ENB opened the schematic diagram of the ratio between duration and the DRX cycle when Figure 10 showed according to the present invention and to provide multiple business in system according to the adjustment of system load situation self adaptation;
ENB changed the schematic diagram that speed degree self adaptation is adjusted non-Active Timer time span according to subscriber channel when Figure 11 showed according to the present invention and to provide multiple business in system;
Figure 12 shows according to the present invention two kinds of eNB dispose the DRX parameter for the user signalling diagram; With
Figure 13 shows eNB according to the present invention adjusts the DRX parameter according to the system load size adaptation installation drawing.
Embodiment
With reference to the accompanying drawings embodiments of the invention are elaborated, having omitted in the description process is unnecessary details and function for the present invention, obscures to prevent that the understanding of the present invention from causing.
According to the present invention, for throughput that guarantees wireless communication system and the electric energy loss of saving the user, need the DRX parameter be set adaptively, to improve the power savings of DRX pattern according to radio channel state.For this reason, can the DRX parameter be set in different ways according to the different situations of wireless channel in the wireless communication system.Below in conjunction with accompanying drawing this is described.
First execution mode
According to the relation between previously described throughput of system and the system load as can be seen, along with the increasing of the number of users that is in active period sometime, the quantity that throughput of system increases is also not obvious.In this case, if additionally increase the number of users that is in active period, very little to the contribution of throughput of system.Based on this, can be when system load be fewer, wishing has the abundant user who is in active period to guarantee the throughput of system, and after the number of users that is in active period increases to a certain degree, because the increase of number of users can not obviously increase the throughput of system, therefore wish that restriction is in the number of users of active period, save user's electric energy efficiently.
For this reason, can adjust user's unlatching duration and the ratio between the DRX cycle according to the loading condition of wireless communication system.Specifically, when the load of wireless communication system is big, can reduce the ratio of opening between duration and the DRX cycle, and when the load of wireless communication system hour, can improve the ratio of opening between duration and the DRX cycle.
In order under the situation that guarantees throughput of system, to save user's power consumption, defined parameter K in the present invention.Parameter K represents to open the ratio between duration and the DRX cycle, and promptly K has been equivalent to describe a user is in active period in a DRX cycle time.From the angle of system, K has described the number of users that is in active period sometime, i.e. N indirectly
0≈ N * K, wherein N represents the size of system load, N
0Expression wishes to be in sometime the number of users of active period.In other words, can detect the load variation amount of wireless communication system, and, change the user is in active period in discontinuous receiving cycle time according to the load variation amount that detects.If control is in the number of users of active period sometime, can realize by the value of adjusting K.
Fig. 6 shows the flow chart of opening the ratio between duration and the DRX cycle according to first embodiment of the present invention eNB according to the adjustment of system load situation self adaptation.Below with reference to Fig. 6 first execution mode that self adaptation is provided with the DRX parameter is described.
At step S601, can the initialization system load be N during beginning
1, the ratio opened between duration and the DRX cycle is K
1At step S602, base station (eNB) detects current system load N
2, and according to current system load N
2The load size of statistical system, and the variation delta N of computational load in real time.At this, N
1The load size of system when being initialization, N
2It is the system load size of real-time statistics.Whether after this, at step S603, eNB judges whether the size of Δ N meets the demands, promptly more than or equal to the set load-threshold value threshold1 of system, for example threshold1=20.As Δ N during more than or equal to the set load-threshold value threshold1 of system, eNB thinks and need adjust the parameter configuration of DRX.In this case, flow process proceeds to step S605, adjusts the size of K value.And when judging Δ N less than the set threshold value threshold1 of system at step S603, eNB thinks and there is no need to adjust the DRX parameter.At this moment, flow process turns back to step S602, continues the statistics load information.
At step S605, eNB calculates according to following expression (1) and will keep the constant needed K value of throughput of system big or small when the load variations, i.e. K
2
After this, at step S606, compare the K that is calculated
2With initial value K
1Size.As the K that satisfies condition
2〉=K
1The time, that is to say when system load diminishes that flow process proceeds to step S607.At step S607, eNB need guarantee to save electric weight under the prerequisite that throughput of system is not suffered a loss, and whether the size of calculating throughput of system when keeping DRX to be provided with satisfies the minimum value C of system to throughput
0Require C (K
1) 〉=C
0Still can not satisfy the throughput of system requirement if do not change the K value, i.e. C (K
1) 〉=C
0, flow process then proceeds to step S608, keeps current DRX parameter to be provided with, i.e. K=K
1If judge C (K at step S607
1) 〉=C
0Be false, this shows that flow process then proceeded to step S609 when the size that does not change the K value can cause the loss of throughput of system.At step S609, eNB can be according to the minimum value C of system to throughput
0The pairing number of users N that is in active period
0, the total system load of current time and the K that is calculated before
2And the system load N of current time
2, utilize following expression (2) to calculate the K value size of assurance throughput of system.
When judging the K that do not satisfy condition at step S606
2〉=K
1The time, that is to say that flow process proceeded to step S610 when system load became big.At step S610, it is not too many that eNB need guarantee to be in simultaneously the number of users of active period, to avoid unnecessary power loss, calculates when the K value and obtain initial value K
1With amount of calculation K
2Average the time pairing throughput of system size, and compare (step 610) with initial throughput of system, if the two difference less than the threshold value threshold2 (as following expression (3) shown in) of system to loss of throughput, stops to calculate so.That is to say, at step S610, because it is big that system load becomes, if keep the K value constant, the number of users that is in active period so in the system simultaneously increases, but this moment, the multi-user diversity of system reached capacity, and increased extra excited users and can bring power consumption but very little to the contribution of throughput, made that the user who activates is not too many so eNB need adjust the K value.
After this, at step S611 current K value is set and is the K value of being asked.IF expression (3) is false, and represents that then current K value can make that the loss of throughput of system is excessive, needs further to improve the size of K value.In this case, at step S612 K is set
2=K, and return step 610 and continue relatively to repeat this process till finding the K value that meets the demands (step 612).Finally obtain the ratio between adjusted unlatching duration and the DRX cycle.
Fig. 7 illustrates a plurality of users adjust K value size according to above-mentioned first execution mode schematic diagram.Suppose when initial
All user UE1, UE2, UE3, UE4 can wake up once in a DRX cycle, and all can be scheduled when waking up; When system load became big, promptly number of users was adjusted the K value and is taken as when 4 rise to 6
Compare with conventional method shown in Figure 3 with Fig. 2, after adopting first embodiment of the invention, each constantly still has the user scheduled, the throughput of system is guaranteed, but for each user, is shortened owing to be in the time scale of active period, thereby power consumption diminishes, but avoided activating situation about not being scheduled, thereby power savings is better, stand-by time is longer.
The method of opening the ratio between duration and the DRX cycle according to the loading condition adjustment of system has been described above.Particularly, when system load is big, can make and in the throughput that guarantees wireless communication system, save user's energy consumption by reducing the ratio of opening between duration and the DRX cycle; And when system load hour, can reduce the ratio of opening between duration and the DRX cycle by improving, thereby in the throughput that guarantees wireless communication system, save user's energy consumption.For this reason, can be according to above-described computational process, also can adopt a kind of method of traversal, calculate the K value under different system loads and the different channel situation, obtain a mapping table (shown in following table 1) of corresponding relation between different system load capacity and unlatching duration and the DRX cycle ratio, and be kept at the base station.
Table 1
In table 1, U
nRepresent different system loads, E
mRepresent different channel situation, K
NmExpression is at the ratio between different system loads and channel situation resulting unlatching duration and the DRX cycle, and wherein m and n are respectively integers.
In the communication process of reality, when the ratio between needs unlatching duration and the DRX cycle, only need can obtain corresponding ratio by the mode of searching mapping table according to current system load amount.
In order to calculate the ratio K between unlatching duration described in the top table 1 and the DRX cycle
Nm, the base station end is estimated in advance, and under different channel situation, during the different system load capacity to contingent channel situation, traversal is calculated unlatching duration of being fit to and all ratios between the DRX cycle.
It is pointed out that by the traversal Calculation Method and obtain above-mentioned mapping table and the method for the self adaptation adjustment that provides previously can independently exist.In other words, in the communication process of reality, can calculate corresponding unlatching duration and the ratio between the DRX cycle in real time according to current system load amount, and be notified to the user.
Second execution mode
First execution mode of opening the ratio between duration and the DRX cycle according to the adjustment of system load situation self adaptation has been described above.The load information that utilizes system and channel variation speed information self-adapting ground are described below adjust second execution mode of DRX parameter.
Can adjust discontinuous time of reception length according to the speed degree of the channel variation of wireless communication system second embodiment of the invention.Specifically, the user fast to channel variation increases user's discontinuous time of reception length, to the slow user of channel variation, reduces user's discontinuous time of reception length.
Fig. 8 shows second embodiment of the present invention eNB adjusts non-Active Timer time span according to the speed degree self adaptation of subscriber channel variation flow chart.Below with reference to Fig. 8 second execution mode that self adaptation is provided with the DRX parameter is described.
Second embodiment of the invention, eNB judges the speed degree of channel variation according to user's translational speed.Use T
iRepresent non-Active Timer time span, Ti_slow, Ti_fast and Ti_original are respectively and become channel user, Quick-Change channel user and initial non-Active Timer time span slowly.As shown in Figure 8, during beginning, the non-Active Timer time span that becomes channel user and Quick-Change channel user slowly is identical, equals initial non-Active Timer time span.At step S801, eNB is by measuring user's translational speed, channel variation speed that can estimating subscriber's, and the subscriber channel that translational speed is high changes fast, and the subscriber channel that opposite translational speed is low changes slow, the threshold value S that is provided with according to system
1, when user's translational speed was lower than this threshold value, eNB judged that he is for becoming channel user slowly.In this case, need adjust its non-Active Timer time span, for example, Ti_slow is set to 1/2 original (step 802).Then, at step S803, eNB calculates and adjusts back user power saving percent delta P/P
0, wherein Δ P is the reduction of average power consumption, P
0Be initial power consumption value, and compare power-saving percent delta P/P
0Size with system door limit value threshold3.If the comparative structure at step S803 shows Δ P/P
0Greater than threshold value threshold3, illustrate that user's electric energy has reached the requirement of system, thus can stop adjustment to the non-Active Timer time length Ti _ slow that becomes channel user slowly, and flow process proceeds to step 804.If the comparative structure at step S803 shows Δ P/P
0Be not more than threshold value threshold3, illustrate that then user's electric energy still needs to improve.In this case, flow process turns back to step 802, continues Ti_slow is adjusted, till electric energy satisfies system requirements.
In step 804, the threshold value S that eNB is provided with according to system
2Search the Quick-Change channel user.When user's translational speed is higher than threshold value S
2The time, eNB judges that it is the Quick-Change channel user.At step S805, eNB need adjust Quick-Change channel user's non-Active Timer time span.For example, Ti_fast is added a TTI length certainly.Then, at step S806, eNB calculates the percent delta R/R that throughput of system improves after the adjustment of non-Active Timer time span
0, wherein Δ R is the recruitment of throughput of system, R
0The throughput of system when being initial, and the comparison system throughput improves percent delta R/R
0Size with system door limit value threshold4.If Δ R/R
0Greater than threshold value threshold4, the loss of illustrative system throughput within the system requirements scope, can stop the adjustment of Ti_fast.In this case, at step S807, obtain adjusted Ti_slow, Tu_fast.If Δ R/R
0Be not more than threshold value threshold4, then the illustrative system loss of throughput still can not be received by system.In this case, flow process turns back to step 805, further adjusts Ti_fast and makes loss of throughput reduce, till meeting the demands.
In step shown in Figure 8, eNB is by the information of measurement user's translational speed acquisition channel variation speed, part as shown in phantom in FIG..Be noted that to the invention is not restricted to this, also can obtain this information by other method.For example, eNB can judge that down channel changes speed by the down channel CQI change in information of statistics user feedback.At this moment, the part in the dotted line can directly replace user's velocity information with CQI information change speed degree.
Fig. 9 show when multi-user's channel variation not simultaneously, carry out the schematic diagram of the setting of non-Active Timer according to second embodiment of the invention.Suppose that all users' non-Active Timer time span all is 4 when initial, use after the self-adapting regulation method of the present invention, slowly the non-Active Timer time span of user that becomes channel is adjusted into 2, and the user of Quick-Change channel is non-, and the Active Timer time span is adjusted into 6.User to the bigger Quick-Change channel of throughput of system contribution has more opportunity to be scheduled like this, and becoming channel user slowly then can not waste power and wait for scheduling.From the total system angle, user's average power consumption can be saved.
Described speed above, adjusted the method for discontinuous time of reception length according to channel variation.Particularly,, can increase user's discontinuous time of reception length, make and in the throughput that guarantees wireless communication system, save user's energy consumption channel variation user faster; And to the slower user of channel variation, can be by reducing user's discontinuous time of reception length, thus in the throughput that guarantees wireless communication system, save user's energy consumption.For this reason, can be according to above-described computational process, also can adopt a kind of method of traversal, calculate the non-Active Timer time span of user under different channel variation speed and the different channel situation, the mapping table (shown in following table 2) of corresponding relation between the speed degree of acquisition channel variation and user's the non-Active Timer time span, and be kept at the base station.
Table 2
In table 2, V
nRepresent different channel variation speed, E
mRepresent different channel situation, Ti
NmExpression is at different channel variation speed and the resulting user's of channel situation non-Active Timer time span, and wherein m and n are respectively integers.
In the communication process of reality, the base station can obtain the corresponding non-Active Timer time span of user according to user's channel variation speed situation and channel situation by tabling look-up, be notified to the user then and upgrade configuration.
In order to calculate the non-Active Timer time length Ti described in the top table 2
Nm, the base station end is estimated channel variance situation in advance, and under different variation speed degree, traversal is calculated the non-Active Timer time span that is fit to.
The method that it is pointed out that above-mentioned mapping table that obtains by the traversal Calculation Method and the self adaptation adjustment that provides previously can independently exist.In other words, in the communication process of reality, can calculate corresponding non-Active Timer time span in real time, and be notified to the user according to current channel variation speed and channel situation.
Above-described self adaptation DRX parameter regulation means is based on the user that identical services quality (QoS) requires, and also promptly all users carry out under the situation of carrying out identical business.When having multiple business in the system, also can use method of the present invention, promptly carry out adaptive adjustment for different business respectively, specifically describe below.
ENB opened the schematic diagram of the ratio between duration and the DRX cycle when Figure 10 showed according to the present invention and to provide multiple business in system according to the adjustment of system load situation self adaptation.As shown in figure 10, exist in system such as VoIP, during multiple business such as network browsing and FTP, the DRX parameter setting of various different business is also inequality, and this can carry out initial setting up according to conventional method.When certain professional load variations, according to conventional method, the DRX parameter is not carry out self adaptation to adjust, but according to method of the present invention, when system load becomes big, need carry out adaptive adjustment to the K value.For example,, be made as 1/4 according to the initial K value of service feature for the network browsing business, when system load when 100 increase to 200, use method of the present invention, the K value is adjusted into 11/48 can better electric energy, in like manner can adjust other professional K values.
ENB changed the schematic diagram that speed degree self adaptation is adjusted non-Active Timer time span according to subscriber channel when Figure 11 showed according to the present invention and to provide multiple business in system.As shown in figure 11, the user that in every kind of business, all can exist fast user who becomes of channel and channel to become slowly, conventional method a T at different business
iBetween have any different, the present invention is T of user of the different channels pace of change in professional to each then
iValue is adjusted.For example, for the FTP user, all FTP user's T when initial
iBe 4, adjust the user T of Quick-Change channel with method of the present invention
iValue becomes the user T of channel slowly greater than 4
iValue can be adjusted other professional T equally less than 4
iValue.
Figure 12 shows two kinds of eNB dispose the DRX parameter for the user signalling diagram.In Figure 12 a, when eNB thinks when being necessary user's DRX parameter adjusted, adjusted DRX parameter can be put into the DRX configuration information, and the DRX configuration information is put into RRC configuration messages (RRCConnectionReconfiguration) send to the user with other configuration messages, after the user successfully receives the DRX configuration messages of eNB, transmission RRC connection is reshuffled the information of finishing (RRCConnectionReconfiguration Complete) message and is replied for the eNB conduct, and carries out discontinuous reception according to this configuration messages.Different with Figure 12 a, Figure 12 b shows the DRX parameter that adopts MACPDU to carry to need change and realizes the DRX dynamic-configuration, and other processes among Figure 12 b are identical with process among Figure 12 a.
Figure 13 shows eNB according to the present invention adjusts the DRX parameter according to the system load size adaptation installation drawing.As shown in figure 13, the eNB side comprises transmission/reception 131 (can be referred to as first transmission/reception), DRX parameter calculation apparatus 132, DRX status register 133 and DRX configuration packages device 134.User side comprises transmission/reception 135 (can be referred to as second transmission/reception) and DRX state adjusting device 136.
Below in conjunction with Figure 13 the operation that self adaptation of the present invention is adjusted the device of DRX parameter is described.In the eNB side, DRX parameter calculation apparatus 132 utilizes the system load amount that is obtained to calculate DRX cycle, open the duration, and the ratio of opening duration and DRX cycle, to obtain DRX parameter adjustment parameter K (at the situation of first execution mode).Under the situation of second mode, DRX parameter calculation apparatus 132 calculates user's non-Active Timer time span according to subscriber channel changing condition information.DRX parameter calculation apparatus 132 is kept at result calculated in the DRX status register 133, perhaps upgrades the DRX parameter or the non-Active Timer time span of formerly preserving in the DRX status register 133 with result calculated.DRX configuration packages unit 134 is the cycle of the discontinuous receiving state that calculates, unlatching duration, and the unlatching duration of calculating and the ratio of DRX cycle, or non-Active Timer length, DRX parameter together with other is encapsulated in Radio Resource control (RRC) message or the media access control protocol data unit (MAC PDU), and sends to this user by transmission/reception 131.
In user (UE) side, DRX state adjusting device 136 is adjusted the DRX state of oneself according to the DRX configuration information that receives from transmission/reception 135.The DRX state of user side adjustment self comprises the operation according to the DRX cycle of the DRX configuration information update oneself that receives, unlatching duration and non-Active Timer time span.
In the present invention, situation according to wireless channel is adjusted discontinuous reception parameters adaptively, make user's activationary time adapt to the variation of wireless channel, avoid the user under the little situation of scheduling possibility, to activate, on bigger degree, utilized the power save properties of discontinuous reception, can obtain more efficient battery saving mode, in open ended throughput of system loss range, significantly reduce power loss.Meanwhile, adjust non-Active Timer length according to the channel variation speed and can also reduce the time that the identical big small documents of transmission will take.
So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that those skilled in the art can carry out various other change, replacement and interpolations under the situation that does not break away from the spirit and scope of the present invention.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.
Claims (16)
1. adjust the method for discontinuous reception parameters of users according to the situation self adaptation of wireless channel for one kind, described method comprises step:
Detect the load variation amount of wireless communication system;
According to the load variation amount that detects, change the user is in active period in discontinuous receiving cycle time.
2. method according to claim 1, further comprise step: open the ratio between duration and the discontinuous receiving cycle under the situation of calculating different system load capacity, obtain the mapping table of the corresponding relation of the ratio between different system load capacity and unlatching duration and the discontinuous receiving cycle.
3. method according to claim 1 and 2 further comprises step:
The initialization system load is N
1, the ratio opened between duration and the discontinuous receiving cycle is K
1
Detect current system load N
2, according to current system load N
2The N of the load size of statistical system, and computational load variation delta in real time;
If described load variation amount Δ N then adjusts discontinuous reception parameters more than or equal to predetermined threshold value.
4. method according to claim 3, the step of wherein adjusting discontinuous reception parameters comprise adjusts the ratio of opening between duration and the discontinuous receiving cycle.
5. method according to claim 4 is wherein calculated according to following expression and is adjusted the ratio K of opening between duration and the discontinuous receiving cycle
2
6. method according to claim 1 and 2 further is included under the situation that satisfies the throughput of system requirement, the step that keeps current discontinuous reception parameters to be provided with.
7. method according to claim 1 and 2 after the throughput that further is included in communication system does not increase with the number of users that is in active period, stops to increase the step of the number of users that is in active period.
8. adjust the method for discontinuous reception parameters of users according to the situation self adaptation of wireless channel for one kind, described method comprises step:
Detect the speed degree that subscriber channel changes;
Speed degree according to subscriber channel changes changes the user is in active period in discontinuous receiving cycle time.
9. method according to claim 8 further comprises step: calculate the non-Active Timer time span of user under the different channel variation speed, the mapping table of corresponding relation between acquisition channel variation speed and user's the non-Active Timer length.
10. according to Claim 8 or 9 described methods, further comprise step:
If user's translational speed is lower than predetermined threshold value S
1, reduce described user's non-Active Timer time span;
Described user saves the percentage of power after the described user's of calculating minimizing the non-Active Timer time span;
If save the power percent value greater than predetermined threshold, stop described user's non-Active Timer time span is adjusted; With
If user's translational speed is not less than predetermined threshold value S
1, increase user's non-Active Timer time span.
11. method according to claim 10 further comprises and calculates the step that non-Active Timer time span increases the percentage of back throughput of system raising.
12. method according to claim 11 further comprises the step that percentage that throughput of system is improved and the system door limit value of being scheduled to compare.
13. method according to claim 12 if wherein comparative result is greater than described predetermined system door limit value, stops to increase user's non-Active Timer time span.
14. method according to claim 13 if wherein comparative result is not more than described predetermined system door limit value, continues to increase user's non-Active Timer time span.
15. the system according to the situation self adaptation adjustment discontinuous reception parameters of users of wireless channel comprises:
The discontinuous reception parameters calculation element is used to obtain discontinuous reception parameters, and calculates the ratio of opening duration and discontinuous receiving cycle;
The discontinuous reception parameters status register is used to the described ratio of preserving discontinuous reception parameters and being calculated;
Discontinuous reception parameters configuration packages device is used for discontinuous reception parameters and the unlatching duration of calculating and the ratio of discontinuous receiving cycle are packaged into discontinuous reception configuration information;
Discontinuous reception adjusting device is used for adjusting according to the discontinuous reception configuration information that receives user's discontinuous receiving state;
First transmission/reception is used for launching discontinuous reception configuration information and the information that receives from the user to the user;
Second transmission/reception is used to receive the discontinuous reception configuration information that described first transmission/reception sends.
16. the system according to the situation self adaptation adjustment discontinuous reception parameters of users of wireless channel comprises:
The discontinuous reception parameters calculation element is used for calculating according to subscriber channel changing condition information user's non-Active Timer time span;
The discontinuous reception parameters status register is used to the non-Active Timer time span of preserving subscriber channel changing condition information and being calculated;
Discontinuous reception parameters configuration packages device is used for discontinuous reception parameters and subscriber channel changing condition information of calculating and the non-Active Timer time span of being calculated are packaged into discontinuous reception configuration information;
Discontinuous reception adjusting device is used for adjusting according to the discontinuous reception configuration information that receives user's discontinuous receiving state;
First transmission/reception is used for launching discontinuous reception configuration information and the information that receives from the user to the user;
Second transmission/reception is used to receive the discontinuous reception configuration information that described first transmission/reception sends.
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| CN200910145794.XA CN101925161B (en) | 2009-06-11 | 2009-06-11 | Method and device for adaptively adjusting discontinuous reception modes in wireless communication system |
| JP2010133498A JP5657283B2 (en) | 2009-06-11 | 2010-06-11 | Method and apparatus for adaptively adjusting intermittent reception mode in wireless communication system |
| JP2014238896A JP5965970B2 (en) | 2009-06-11 | 2014-11-26 | Method and apparatus for adaptively adjusting intermittent reception mode in wireless communication system |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2015073307A (en) | 2015-04-16 |
| CN101925161B (en) | 2014-11-19 |
| JP5657283B2 (en) | 2015-01-21 |
| JP2010288278A (en) | 2010-12-24 |
| JP5965970B2 (en) | 2016-08-10 |
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