CN101925161B - 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, relate to the discontinuous reception parameters that user is set adaptively according to the situation of wireless channel, thereby further improve the method and apparatus of the electric energy of discontinuous reception modes.
Background technology
Third generation partner program (3rd Generation Partnership Project, 3GPP) as the vital tissue of moving communicating field, greatly promoted the Standardization of 3G (Third Generation) Moblie technology (TheThird Generation, 3G).3GPP has formulated a series of Wideband Code Division Multiple Access (WCDMA) access (Wide Code Division Multiple Access that comprise, WCDMA), high speed downlink packet access (High Speed Downlink Packet Access, HSDPA), high speed uplink packet access (High Speed Uplink Packet Access, HSUPA) etc. is in interior communication system standard.In order to tackle the challenge of broadband access technology, and meet the demand of growing new 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, for high-speed mobile user provides the access service etc. of higher rate.
In above-mentioned mobile communication system, the mutual supply based on both sides' energy of information between user and base station.For the battery-powered travelling carriages such as the overwhelming majority such as mobile phone, notebook computer, its energy reserve is limited.Therefore, thus how falling standby and the service time that low-energy-consumption extends user is in mobile communication system, to need one of key issue of considering.
In order to realize this object, in the standard of 3GPP, adopted discontinuous reception (DiscontinuousReception, DRX) pattern, by allowing user's monitor channel receive downlink business in the special time period of appointing with 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, although first-class slightly different in state, channel and the trigger condition of its application, the operating process of user under DRX pattern is identical, can characterize by several specific parameters.
Fig. 1 shows the operating process of user under discontinuous reception modes.As shown in Figure 1, under DRX pattern, user UE (mobile terminal) is alternately in " active period " (Active Period) and " sleep period " (Sleep Period).In the zero hour of twice continuous active period, namely the time interval between activation period starting point (APSP:Active Period Starting Point) is called as a discontinuous receiving cycle (DRX cycle).In active period, user opens its receiver (Receiver, Rx) with information the downlink data receiving of monitoring control channel; And in sleep period, UE does not need monitoring control channel, thereby reach the object of power saving.In carry out the whole standard of describing for LTE, the DRX to user under Radio Resource control connection (RRC_CONNECTED) state is illustrated, and provides to give a definition:
-opening the duration (on-duration): user waits for the time that receives Physical Downlink Control Channel (PDCCH:Physical Downlink Control Channel) from the sleep period of DRX is waken up, its unit is Transmission Time Interval (TTI:Transmission Time Interval).User is entering this unlatching duration when DRX sleep state is waken up, if during this period of time user successfully decodes to PDCCH, user will keep the state of (Awake) of waking up, and start inactive timer (Inactivity Timer); Otherwise user will enter DRX sleep state in the situation that DRX configuration allows.
-inactive timer (inactivity timer): user waits for the time of the PDCCH that again successfully decodes after successfully decoding PDCCH from the last time, and its unit is TTI.If user successfully decodes to PDCCH, user will keep awake state, and again start inactive timer, until certain media access control (MAC:Medium Access Control) head or control message tell user to reenter discontinuous receiving state, and in MAC payload, indicate clearly the cycle of DRX; Or this user automatically reenters discontinuous receiving state according to predefined DRX cycle when inactive timer finishes.
-DRX cycle (DRX Cycle): institute's interlude between two adjacent unlatching duration, may comprise the time in inactive timer in during this period of time
-activationary time (active time): the time of user in awake state, comprise unlatching duration in DRX cycle and before inactive timer finishes user carry out the time receiving continuously.The minimum value of this activationary time equals to open the duration, and maximum is restriction not.In parameter defined above, opening duration and inactive timer is fixing value, Universal Terrestrial Radio Access Network network enhancement mode B node (Evolved Universal TerrestrialAccess Network NodeB by evolution, eNB) (base station) notifies user to arrange, and activationary time depends on that to the successfully decoded of PDCCH whether scheduling strategy and user.
By above-mentioned discontinuous reception, user does not need to continue monitor channel, and just at intervals some specific constantly waking up, thereby reduce because unnecessarily monitor channel and the not one's own data of decoding and the energy consumption that causes extends 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 user is in sleep period time, even if user is likely 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, user's active period has limited user and has participated in the time of dispatching; On the other hand, due to the variation of channel condition, the possibility that user is scheduled constantly at some is lower, but because the user that is arranged so that of active period wakes up constantly at this, but the not transmission of data has increased meaningless energy loss thus.Cause the main cause of these two kinds of results to be, in multi-user's situation, the scheduling result of scheduler is except relevant with the activationary time that participates in dispatched users, also directly be subject to the impact of each user radio channel conditions, so, realize more effectively power savings, just should adjust adaptively user's DRX parameter configuration, it is matched with radio channel state.
Fig. 2 and 3 shows respectively the schematic diagram on scheduling result impact while carrying out discontinuous reception in the situation that different user is counted.Here Radio Resource is expressed as to the set of two dimensional wireless Resource Block, transverse axis represents time-domain, YiTTIWei unit, and the longitudinal axis represents frequency domain, take subcarrier as unit.Like this, in a TTI, the 2 dimensional region that the subcarrier of some (such as conventionally adopting 12 continuous subcarriers in LTE) forms is called as a Resource Block (RB:Resource Block), the number N of Resource Block in a corresponding TTI
rBrepresent.Fig. 2 is with N
rB=2 have provided the schematic diagram on scheduling result impact while carrying out discontinuous reception in the situation that different user is counted for example.The set of radio resources of eNB (base station) based on such carried out resource distribution, and on corresponding Resource Block, data passed to corresponding user.As shown in Figure 2, suppose in current system, have four user UE1, UE2, 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 within each customed time period.Each constantly eNB can detect the user in active period, and while having the data of pointing to them in memory, be their Resources allocation.When number of users increases to 6 from 4, as shown in Figure 3, the DRX parameter configuration of supposing user does not change, can see that now user 3 (UE3) and user 4 (UE4) are owing to there being the competition of user 5 and 6, in the active period having, do not have scheduled, wait until that next active period just can be scheduled, will make like this user 3,4 cause meaningless power loss.From system perspective, due to multi-user diversity, each is constantly more in the number of users of active period, has higher throughput of system.
Fig. 4 shows the trend schematic diagram that throughput of system changes with the change of the number of users in active period.As shown in Figure 4, although the throughput of system increases along with the increase of the number of users that participates in dispatching, but after number of users reaches some, the growth of throughput of system is also not obvious, user's power consumption but with time span relation in direct ratio in active period.Therefore, increase simply excited user number and can not improve significantly throughput of system, can increase on the contrary user's power consumption.In addition, the load of system is time dependent, for example, larger from sky work time system duty ratio, during night system load smaller, if adopt identical DRX parameter configuration, too much in the number of users of active period when will make system load large, consume user's electric weight meaninglessly.
Fig. 5 shows user that channel variance situation is different under the inactive set timer of identical DRX, the schematic diagram of active period of living in.As shown in Figure 5 a, when user's channel variation is slower, for example, when user moving speed is smaller, in certain inactive timer of opening, once user be not scheduled sometime, due to the impact of channel relevancy, the possibility that the interior time below of inactive timer is not scheduled is also larger, and the possibility not being scheduled in Period1 is larger.If inactive timer is long, the state that this user just may not be scheduled in activation in long time has namely consumed electric weight meaninglessly.On the contrary, if be shorter value by inactive set timer, can this thing happens, and due to as long as user is scheduled, will reopen an inactive timer, so user can't miss the time that may be scheduled.As shown in Figure 5 b, when user's channel variation compares faster, for example, when user moving speed is larger, this user is not strong in the possibility correlation whether being scheduled sometime with being scheduled within the time after this.So user's activationary time is longer, the chance that may be scheduled is more.Like this, if according to traditional method, in the situation that different channel variation speed, to user, identical inactive timer time length is set, can make slow meaningless ground of the user consumes power of channel variation, and the fast user's of channel variation transmission rate is restricted, be also that the energy-saving efficiency of DRX is not better utilized.Therefore need to be according to the situation of wireless channel, adaptive adjustment DRX parameter, thus obtain more efficient energy-saving effect.That is, in the situation that minimum loss of throughput is saved more user's energy.
As mentioned above, user's discontinuous reception depends on the setting of several parameters: open duration, inactive timer, DRX cycle.Wherein open duration and DRX cycle and determined to a great extent user's shared ratio of the time in active period, thereby also just determined the number of the number of users in active period in whole system at a time.Therefore, by adjusting DRX cycle and the relation of unlatching duration, can adjust the number of users in active period, thus economize on electricity problem when resolution system load is large.On the other hand, the length of inactive timer determined user be scheduled after continuous time of monitor channel, user's activationary time is also had to impact.Therefore, according to channel variation speed, adjust the inactive timer time length of user in prior art, can effectively improve different channels and change the energy-saving efficiency in user's mixing situation.In existing technology, open duration, DRX cycle and inactive timer and conventionally by user's type of service, determined, and not along with system load number and the speed of channel variation adjust.Yet, from analysis above, can find out, the mode of DRX parameter is set like this, can make certain customers be activated in the moment being unlikely scheduled, expend electric weight meaninglessly, and even if another part user may, still in sleep period in the situation that may being scheduled, reduce 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 in the situation that guaranteeing throughput of system requirement, more effectively save user's electric weight, prolongation user stand-by time.
Summary of the invention
An object of the present invention is to provide a kind of according to the method and apparatus of the situation self adaptation adjustment user's of wireless channel discontinuous reception parameters, can arrange and open duration, inactive timer and DRX cycle according to radio channel state, thereby further improve the electric energy of user's discontinuous reception, more effectively extend user's stand-by time.
Another object of the present invention is to provide a kind of according to the method and apparatus of the situation self adaptation adjustment user's of wireless channel discontinuous reception parameters, can utilize the load information of system and the adjustment of channel variation speed information self-adapting to open duration, inactive timer and DRX cycle, thereby further improve the electric energy of discontinuous reception, more effectively extend user's stand-by time.
According to an aspect of the present invention, provide a kind of according to the method for the situation self adaptation adjustment user's of wireless channel discontinuous reception parameters, described method comprises step: the load variation amount that detects wireless communication system; According to the load variation amount detecting, change user's time in active period in discontinuous receiving cycle.
According to another aspect of the present invention, provide a kind of according to the method for the situation self adaptation adjustment user's of wireless channel discontinuous reception parameters, comprise step: detect the speed that subscriber channel changes; The speed degree changing according to subscriber channel, changes user's time in active period in discontinuous receiving cycle.
According to a further aspect of the invention, provide a kind of according to the system of the situation self adaptation adjustment user's of wireless channel discontinuous reception parameters, comprise: discontinuous reception parameters calculation element, be used for obtaining discontinuous reception parameters, and calculate the ratio of opening duration and discontinuous receiving cycle; Discontinuous reception parameters status register, for the described ratio of preserving discontinuous reception parameters and calculating; Discontinuous reception parameters configuration packages device, for by 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, for adjusting user's discontinuous receiving state according to the discontinuous reception configuration information receiving; The first transmission/reception, for launching discontinuous reception configuration information and receiving the information from user to user; The second transmission/reception, the discontinuous reception configuration information sending for receiving described the first transmission/reception.
According to a further aspect of the invention, provide a kind of according to the system of the situation self adaptation adjustment user's of wireless channel discontinuous reception parameters, comprise: discontinuous reception parameters calculation element, for calculate user's inactive timer time length according to subscriber channel changing condition information; Discontinuous reception parameters status register, for the inactive timer time length of preserving subscriber channel changing condition information and calculating; Discontinuous reception parameters configuration packages device, for by discontinuous reception parameters, and the subscriber channel changing condition information of calculating and the inactive timer time length calculated are packaged into discontinuous reception configuration information; Discontinuous reception adjusting device, for adjusting user's discontinuous receiving state according to the discontinuous reception configuration information receiving; The first transmission/reception, for launching discontinuous reception configuration information and receiving the information from user to user; The second transmission/reception, the discontinuous reception configuration information sending for receiving described the first transmission/reception.
According to the present invention, according to the situation of wireless channel, adjust adaptively the DRX parameter such as DRX cycle, unlatching duration and inactive timer, make the variation of user's activationary time adaptation wireless channel, avoid user to activate in the situation that scheduling possibility is little, in larger 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, according to channel variation speed, adjust file time that will take that inactive timer time length can also reduce transmission formed objects.
Accompanying drawing explanation
By below in conjunction with accompanying drawing explanation the preferred embodiments of the present invention, will make of the present invention above-mentioned and other objects, features and advantages are clearer, wherein:
Fig. 1 shows the operating process schematic diagram of user under discontinuous reception modes;
It is the schematic diagram on scheduling result impact while carrying out discontinuous reception at 4 o'clock at number of users that Fig. 2 shows according to prior art;
It is the schematic diagram on scheduling result impact while carrying out discontinuous 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 in active period;
Under the DRX pattern that Fig. 5 a and 5b show in prior art, the schematic diagram of the user of different channels situation of change active period of living under the inactive set timer of identical DRX;
Fig. 6 shows and according to first embodiment of the present invention eNB, according to the adjustment of system load situation self adaptation, opens the flow chart of the ratio between duration and DRX cycle;
Fig. 7 shows and according to first embodiment of the present invention eNB, according to the adjustment of system load situation self adaptation, opens the schematic diagram of the ratio between duration and DRX cycle;
Fig. 8 shows eNB according to a second embodiment of the present invention and according to the speed degree self adaptation of subscriber channel variation, adjusts the flow chart of inactive timer time length;
Fig. 9 show according to a second embodiment of the present invention channel variation as multi-user when different inactive timer schematic diagram is set;
Figure 10 shows according to the present invention eNB when system provides multiple business and according to the adjustment of system load situation self adaptation, opens the schematic diagram of the ratio between duration and DRX cycle;
Figure 11 shows according to the present invention eNB when system provides multiple business and changes according to subscriber channel the schematic diagram that speed degree self adaptation is adjusted inactive timer time length;
Figure 12 shows according to the present invention two kinds of eNB and configures the signalling diagram of DRX parameter for user; With
Figure 13 shows eNB according to the present invention and according to system load size adaptation, adjusts the installation drawing of DRX parameter.
Embodiment
With reference to the accompanying drawings embodiments of the invention are elaborated, in description process, having omitted is unnecessary details and function for the present invention, to prevent that the understanding of the present invention from causing, obscures.
According to the present invention, in order to guarantee the throughput of wireless communication system and to save user's electric energy loss, need to DRX parameter be set adaptively according to radio channel state, to improve the power savings of DRX pattern.For this reason, can DRX parameter be set in different ways according to the different situations of wireless channel in wireless communication system.Below in conjunction with accompanying drawing, this is described.
The first execution mode
According to the relation between previously described throughput of system and system load, can find out, along with increasing of the number of users 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 in active period, very little to the contribution of throughput of system.Based on this, can be when system load be fewer, wish the throughput that the abundant user in active period guarantees system, and after the number of users 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 the number of users of restriction in active period, save efficiently user's electric energy.
For this reason, can adjust user's unlatching duration and the ratio between DRX cycle according to the loading condition of wireless communication system.Specifically, when the load of wireless communication system is large, can reduce the ratio of opening between duration and DRX cycle, and when the load of wireless communication system hour, can improve the ratio of opening between duration and DRX cycle.
In order to save user's power consumption in the situation that guaranteeing throughput of system, defined in the present invention parameter K.Parameter K represents to open the ratio between duration and DRX cycle, and K has been equivalent to describe user time in active period in a DRX cycle.From the angle of system, K has described the number of users in active period, i.e. N sometime indirectly
0≈ N * K, wherein N represents the size of system load, N
0represent to wish the number of users in active period sometime.In other words, can detect the load variation amount of wireless communication system, and according to the load variation amount detecting, change user's time in active period in discontinuous receiving cycle.If control the number of users in active period sometime, can realize by adjusting the value of K.
Fig. 6 shows and according to first embodiment of the present invention eNB, according to the adjustment of system load situation self adaptation, opens the flow chart of the ratio between duration and DRX cycle.Below with reference to Fig. 6, the first execution mode that self adaptation arranges DRX parameter is described.
At step S601, during beginning, can initialization system load be N
1, the ratio opened between duration and DRX cycle is K
1.At step S602, base station (eNB) detects current system load N
2, and according to current system load N
2the variation delta N of the load of statistical system, and computational load in real time.At this, N
1the load of system while being initialization, N
2it is the system load size of real-time statistics.After this, at step S603, eNB judges whether the size of Δ N meets the demands, the load-threshold value threshold1 that the system that whether is more than or equal to is set, for example threshold1=20.When Δ N is more than or equal to the set load-threshold value threshold1 of system, eNB thinks and need to adjust the parameter configuration of DRX.In this case, flow process proceeds to step S605, adjusts the size of K value.And when the set threshold value threshold1 of the system that is less than at step S603 judgement Δ N, eNB thinks and there is no need to adjust DRX parameter.Now, flow process turns back to step S602, continues statistics load information.
At step S605, eNB calculates and when load variations, wants the constant needed K value size of keeping system throughput, i.e. K according to expression formula (1) below
2.
After this, at step S606, the K relatively calculating
2with initial value K
1size.As the K that satisfies condition
2>=K
1time, that is to say when system load diminishes, flow process proceeds to step S607.At step S607, eNB need to 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 arrange meets the minimum value C of system to throughput
0require C (K
1)>=C
0.If do not change K value, still can not meet throughput of system requirement, i.e. C (K
1)>=C
0, flow process proceeds to step S608, keeps current DRX parameter setting, i.e. K=K
1.If at step S607 judgement C (K
1)>=C
0be false, when this size that shows not change K value can cause the loss of throughput of system, flow process proceeds to step S609.At step S609, eNB can be according to system the minimum value C to throughput
0the corresponding number of users N in active period
0, the total system load of current time and the K that calculated before
2and the system load N of current time
2, utilize expression formula (2) below to calculate the K value size that guarantees throughput of system.
As the K that do not satisfy condition in step S606 judgement
2>=K
1time, that is to say that, when system load becomes large, flow process proceeds to step S610.At step S610, eNB need to guarantee that the number of users in active period is not too many simultaneously, and to avoid unnecessary power loss, calculating is worked as K value and obtained initial value K
1with amount of calculation K
2average time corresponding throughput of system size, and compare (step 610) with initial throughput of system, if the two difference is less than system to the threshold value threshold2 of loss of throughput (as shown in expression formula (3) below), stop so calculating.That is to say, at step S610, because system load becomes large, if keep K value constant, in system, the number of users in active period increases simultaneously so, but now the multi-user diversity of system reaches capacity, increase extra excited users and can bring power consumption but very little to the contribution of throughput, so need to adjusting K value, eNB make the user who activates not too many.
After this, at step S611, current K value is set and is required K value.IF expression (3) is false, and represents that current K value can make the loss of throughput of system excessive, needs further to improve the size of K value.In this case, at step S612, K is set
2=K, and return to step 610 and continue relatively, to repeat this process until find the K value (step 612) meeting the demands.Unlatching duration after being finally adjusted and the ratio between DRX cycle.
Fig. 7 illustrates a plurality of users and adjusts the big or small schematic diagram of K value according to above-mentioned the first execution mode.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 becomes large, when number of users rises to 6 from 4, adjust K value and be taken as
compare with the conventional method shown in Fig. 3 with Fig. 2, adopt after first embodiment of the invention, each constantly still has user scheduled, the throughput of system is guaranteed, but for each user, because the time scale in active period is shortened, 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 DRX cycle according to the loading condition adjustment of system has been described above.Particularly, when system load is larger, can open the ratio between duration and DRX cycle by reduction, make, when guaranteeing the throughput of wireless communication system, to save user's energy consumption; And when system load hour, can reduce the ratio between unlatching duration and DRX cycle by raisings, thus in the throughput of assurance wireless communication system, saving 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 different system loads and K value under different channel situation, obtain a mapping table (as shown in Table 1 below) of corresponding relation between different system load capacity and unlatching duration and DRX cycle ratio, and be kept at base station.
Table 1
In table 1, U
nrepresent different system loads, E
mrepresent different channel situation, K
nmexpression is for the ratio between different system loads and channel situation resulting unlatching duration and DRX cycle, and wherein m and n are respectively integers.
In actual communication process, when need to open between duration and DRX cycle ratio time, only need to, according to current system load amount, by searching the mode of mapping table, can obtain corresponding ratio.
In order to calculate the ratio K between the unlatching duration described in table 1 and DRX cycle above
nm, can make base station end in advance contingent channel situation be estimated, and under different channel situation, during different system load capacity, traversal is calculated applicable unlatching duration and all ratios between DRX cycle.
It is pointed out that the method for calculating by traversal obtains above-mentioned mapping table and can independently exist with the method for the self adaptation adjustment providing above.In other words, in actual communication process, can calculate in real time corresponding unlatching duration and the ratio between DRX cycle according to current system load amount, and notice is to user.
The second execution mode
The first execution mode of opening the ratio between duration and DRX cycle according to the adjustment of system load situation self adaptation has been described above.The second execution mode that utilizes the load information of system and channel variation speed information self-adapting and adjust DRX parameter is described below.
Can adjust discontinuous reception time span 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 reception time span, to the slow user of channel variation, reduces user's discontinuous reception time span.
Fig. 8 shows second embodiment of the present invention eNB and according to the speed degree self adaptation of subscriber channel variation, adjusts the flow chart of inactive timer time length.Below with reference to Fig. 8, the second execution mode that self adaptation arranges 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 inactive timer time length, Ti_slow, Ti_fast and Ti_original are respectively slow change channel user, Quick-Change channel user and initial inactive timer time length.As shown in Figure 8, during beginning, the inactive timer time length that becomes slowly channel user and Quick-Change channel user is identical, equals initial inactive timer time length.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 contrary translational speed is low changes slow, the threshold value S arranging according to system
1, when user's translational speed is lower than this threshold value time, eNB judges that he is for becoming slowly channel user.In this case, need to adjust its inactive timer time length, for example, Ti_slow is set to 1/2 original (step 802).Then,, at step S803, after eNB calculates and adjusts, user power is saved percent delta P/P
0, wherein Δ P is the reduction of average power consumption, P
0be initial power consumption value, and relatively power is saved percent delta P/P
0size with system door limit value threshold3.If the comparative structure at step S803 shows Δ P/P
0be greater than threshold value threshold3, illustrate that user's electric energy has reached the requirement of system, thus the adjustment to the inactive timer time length T i_slow of slow change channel user can be stopped, 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 user's electric energy still needs to improve.In this case, flow process turns back to step 802, continues Ti_slow to adjust, until electric energy meets system requirements.
In step 804, the threshold value S that eNB arranges according to system
2search Quick-Change channel user.When user's translational speed is higher than threshold value S
2time, eNB judges that it is Quick-Change channel user.At step S805, eNB need to adjust Quick-Change channel user's inactive timer time length.For example, Ti_fast is added to a TTI length certainly.Then, at step S806, eNB calculates the percent delta R/R that throughput of system improves after inactive timer time length adjustment
0, wherein Δ R is the recruitment of throughput of system, R
0the throughput of system while being initial, and comparison system throughput improves percent delta R/R
0size with system door limit value threshold4.If Δ R/R
0be greater than threshold value threshold4, the loss of illustrative system throughput, within system requirements scope, can stop the adjustment of Ti_fast.In this case, at step S807, the Ti_slow after being adjusted, Ti_fast.If Δ R/R
0be not more than threshold value threshold4, 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 loss of throughput is reduced, until meet the demands.
In the step shown in Fig. 8, eNB obtains the information of channel variation speed, as shown in phantom in FIG. part by measuring user's translational speed.Be noted that and the invention is not restricted to this, also can obtain by other method this information.The variation of the down channel CQI information that for example, eNB can feed back by counting user judges that down channel changes speed.At this moment, the part in dotted line can directly replace user's velocity information with CQI information change speed degree.
Fig. 9 shows when multi-user's channel variation difference, the schematic diagram that carries out the setting of inactive timer according to second embodiment of the invention.Suppose that all users' inactive timer time length is all 4 when initial, after using self-adapting regulation method of the present invention, the slow inactive timer time length adjustment of user that becomes channel is 2, and the inactive timer time length adjustment of user of Quick-Change channel is 6.To the user of the larger Quick-Change channel of throughput of system contribution, have more chance to be scheduled like this, becoming slowly channel user can not waste power and wait for scheduling.From total system angle, user's average power consumption can be saved.
Describe the speed according to channel variation above, adjusted the method for discontinuous reception time span.Particularly, to channel variation user faster, can increase user's discontinuous reception time span, make, when guaranteeing the throughput of wireless communication system, to save user's energy consumption; And to the slower user of channel variation, can be by reducing user's discontinuous reception time span, thus when guaranteeing the throughput of 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 different channel variation speed and user's under different channel situation inactive timer time length, obtain the mapping table (as shown in Table 2 below) of corresponding relation between the speed degree of channel variation and user's inactive timer time length, and be kept at base station.
Table 2
In table 2, V
nrepresent different channel variation speed, E
mrepresent different channel situation, Ti
nmexpression is for different channel variation speed and the resulting user's of channel situation inactive timer time length, and wherein m and n are respectively integers.
In actual communication process, base station can, according to user's channel variation speed situation and channel situation, by tabling look-up to obtain the corresponding inactive timer time length of user, then be notified to user and carry out Reconfigurations.
In order to calculate the inactive timer time length T i described in table 2 above
nm, can make base station end in advance channel variance situation be estimated, and under different variation speed degrees, traversal is calculated the inactive timer time length being applicable to.
It is pointed out that the above-mentioned mapping table that the method calculated by traversal obtains can independently exist with the method for the self adaptation adjustment providing above.In other words,, in actual communication process, can, according to current channel variation speed and channel situation, calculate in real time corresponding inactive timer time length, and notice be to user.
Above-described self adaptation DRX parameter regulation means is the user who requires based on identical services quality (QoS), also all users in the situation that carry out that identical business carries out.While there is multiple business in system, also can use method of the present invention, for different business, carry out adaptive adjustment respectively, be specifically described below.
Figure 10 shows according to the present invention eNB when system provides multiple business and according to the adjustment of system load situation self adaptation, opens the schematic diagram of the ratio between duration and DRX cycle.As shown in figure 10, in system, exist such as VoIP, during the multiple business such as network browsing and FTP, the DRX parameter setting of various different business is not identical, and this can carry out initial setting up according to conventional method.When the load variations of certain business, according to conventional method, DRX parameter is not carry out self adaptation adjustment, but according to method of the present invention, when system load becomes large, need to carry out adaptive adjustment to K value.For example, for network browsing business, according to the initial K value of service feature, be made as 1/4, when system load increases to 200 from 100, use method of the present invention, K value is adjusted into 11/48 can better electric energy, in like manner can adjust the K value of other business.
Figure 11 shows according to the present invention eNB when system provides multiple business and changes according to subscriber channel the schematic diagram that speed degree self adaptation is adjusted inactive timer time length.As shown in figure 11, in every kind of business, all can there is the fast user who becomes of channel and the slow user who becomes of channel, a conventional method T at different business
ibetween have any different, the present invention is the T to the user of the different channels pace of change in each business
ivalue is adjusted.For example, for FTP user, all FTP user's T when initial
ibe 4, by method of the present invention, adjust the user T of Quick-Change channel
ivalue is greater than 4, becomes slowly the user T of channel
ivalue is less than 4, can adjust equally the T of other business
ivalue.
Figure 12 shows two kinds of eNB and configures the signalling diagram of DRX parameter for user.In Figure 12 a, when eNB thinks when being necessary user's DRX parameter to adjust, DRX parameter after adjusting can be put into DRX configuration information, and DRX configuration information is put into RRC configuration messages (RRCConnectionReconfiguration) send to user together with other configuration messages, after user successfully receives the DRX configuration messages of eNB, send RRC connect reshuffled information (RRCConnectionReconfiguration Complete) message to eNB as replying, and carry out discontinuous reception according to this configuration messages.Different from Figure 12 a, Figure 12 b shows the DRX parameter that adopts MACPDU to carry needs change and realizes DRX dynamic-configuration, and other processes in Figure 12 b are identical with the process in Figure 12 a.
Figure 13 shows eNB according to the present invention and according to system load size adaptation, adjusts the installation drawing of DRX parameter.As shown in figure 13, eNB side comprises transmission/reception 131 (can be referred to as the first transmission/reception), DRX parameter calculation apparatus 132, DRX status register 133, and DRX configuration packages device 134.User's side comprises transmission/reception 135 (can be referred to as the 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 eNB side, DRX parameter calculation apparatus 132 utilizes the system load amount obtaining to calculate DRX cycle, open the duration, and the ratio of opening duration and DRX cycle, to obtain DRX parameter adjustment parameter K (for the situation of the first execution mode).The in the situation that of second method, DRX parameter calculation apparatus 132 calculates user's inactive timer time length according to subscriber channel changing condition information.DRX parameter calculation apparatus 132 is kept at the result of calculating in DRX status register 133, or upgrades DRX parameter or the inactive timer time length of formerly preserving in DRX status register 133 by the result of calculating.DRX configuration packages unit 134 is the cycle of the discontinuous receiving state calculating, unlatching duration, and the unlatching duration of calculating and the ratio of DRX cycle, or inactive timer length, DRX parameter together with other is encapsulated in Radio Resource control (RRC) message or media access control protocol data unit (MAC PDU), and sends to this user by transmission/reception 131.
DRX status register 133 is preserved all users' that are connected with this eNB current DRX state information, comprises DRX cycle, opens duration, the unlatching duration of calculating and the ratio of DRX cycle, and inactive timer length information.Transmission/reception 131 is used for the information of sending and receiving from wave point.
In user (UE) side, DRX state adjusting device 136 is adjusted the DRX state of oneself according to the DRX configuration information receiving from transmission/reception 135.The DRX state of user's side adjustment self comprises according to the operation of the DRX cycle of the DRX configuration information update oneself receiving, unlatching duration and inactive timer time length.
In the present invention, according to the situation of wireless channel, adjust adaptively discontinuous reception parameters, make the variation of user's activationary time adaptation wireless channel, avoid user to activate in the situation that scheduling possibility is little, in larger 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, according to channel variation speed, adjust inactive timer length and can also reduce the time that transmission formed objects file will take.
So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that, those skilled in the art without departing from the spirit and scope of the present invention, can carry out various other change, replacement and interpolations.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.
Claims (5)
1. according to the situation self adaptation of wireless channel, adjust a method for user's discontinuous reception parameters, described method comprises step:
A. initialization system load N
1, and calculate to open the ratio K between duration and discontinuous reception DRX period
1;
B. detect current system load N
2, according to current system load N
2the variation delta of the load of statistical system, and computational load in real time N;
C. judge whether load variation amount Δ N is more than or equal to or is less than default threshold value;
If d. described load variation amount Δ N is more than or equal to predetermined load-threshold value, discontinuous reception DRX parameter is adjusted; And
If e. described load variation amount Δ N is less than predetermined load-threshold value, do not adjust discontinuous reception DRX parameter, and return to step b,
Wherein adjust discontinuous reception DRX parameter and comprise the ratio of adjusting between unlatching duration and discontinuous receiving cycle.
2. method according to claim 1, wherein calculates and adjusts the ratio K of opening between duration and discontinuous receiving cycle according to expression formula below
2
3. method according to claim 1 and 2, is further included in the situation that meets throughput of system requirement, the step that keeps current discontinuous reception parameters to arrange.
4. method according to claim 1 and 2, after the throughput that is further included in communication system does not increase with the number of users in active period, stops increasing the step of the number of users that is in active period.
5. according to the situation self adaptation of wireless channel, adjust a system for user's discontinuous reception parameters, comprising:
Discontinuous reception parameters calculation element, for initialization system load N
1, obtain system load amount, and calculate the ratio of opening duration and discontinuous receiving cycle, and according to the current system load N detecting
2the load of statistical system in real time, computational load variation delta N;
Discontinuous reception parameters status register, for the described ratio of preserving discontinuous reception parameters and calculating;
Discontinuous reception parameters configuration packages device, for by 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, for adjusting user's discontinuous receiving state according to the discontinuous reception configuration information receiving;
The first transmission/reception, for launching discontinuous reception configuration information and receiving the information from user to user;
The second transmission/reception, the discontinuous reception configuration information sending for receiving described the first transmission/reception,
Wherein discontinuous reception adjusting device judges whether load variation amount Δ N is more than or equal to or is less than default threshold value; If described load variation amount Δ N is more than or equal to predetermined load-threshold value, discontinuous reception DRX parameter is adjusted; If described load variation amount Δ N is less than predetermined load-threshold value, do not adjust discontinuous reception DRX parameter, adjust discontinuous reception DRX parameter and comprise the ratio of adjusting between unlatching duration and discontinuous receiving cycle.
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