CN102223210A - Method and device for adjusting block error rate - Google Patents
Method and device for adjusting block error rate Download PDFInfo
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- CN102223210A CN102223210A CN2011102036023A CN201110203602A CN102223210A CN 102223210 A CN102223210 A CN 102223210A CN 2011102036023 A CN2011102036023 A CN 2011102036023A CN 201110203602 A CN201110203602 A CN 201110203602A CN 102223210 A CN102223210 A CN 102223210A
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Abstract
The invention discloses a method for adjusting block error ratio. The method is used for realizing the adjustment on initial error block ratio, and further improves the veracity of the adjustment in a modulation coding mode. The method comprises the following steps of determining the QoS (Quality of Service) index of the current service of the user; judging whether the target initial block error rate (BLER) needs to be adjusted or not according to the determined QoS index; if so, carrying out the adjustment; and if not, keeping the current target initial BLER unchanged. The invention also discloses a device for implementing the method.
Description
Technical field
The present invention relates to the communications field, particularly relate to method and the device of adjusting Block Error Rate.
Background technology
In mobile communication system, become during owing to wireless fading channel, rapid fading can reach tens even tens dB in short-term, makes to have a large amount of uncertainties in the whole wireless communication procedure.For addressing this problem, and take all factors into consideration the throughput and the reliability of system, in wireless communication system, introduced Adaptive Modulation and Coding technology (AMC, Adaptive Modulation Coding), its basic principle is the instantaneous state information self-adapting ground change modulation coding mode (MCS according to channel, Modulation and Coding Scheme), thus under different channel statuss, obtain best throughput.In present AMC scheme, be to set one or several fixing Initial Block Error Rate (BLER mostly according to system emulation or the network planning or optimization experience, block error ratio), then according to UE (User ' s Equipment, subscriber equipment) under current channel condition, for the spectrum efficiency that the initial BLER that reaches this UE requires to support is come adaptive selection MCS grade.
The initial BLER of target is changeless in the prior art.The present inventor finds, in this AMC mechanism, because the receiving terminal channel conditions constantly changes, therefore the MCS grade selected of the initial BLER of target of channel information that obtains according to feedback or the base station measurement of UE and setting can not be fully and the channel conditions when carrying out transfer of data be complementary, therefore, can occur actual when carrying out Data Receiving the Initial Block Error Rate of receiving terminal be not equal to the situation of the initial BLER of target of setting.If still select the MCS grade according to the initial BLER of target, then MCS grade of Xuan Zeing and current channel conditions do not match, and will influence data transmission quality or efficient.
Summary of the invention
The embodiment of the invention provides a kind of method and device of adjusting Block Error Rate, is used to realize the adjustment to Initial Block Error Rate, and then improves the accuracy that modulation coding mode is regulated.
A kind of method of adjusting Block Error Rate may further comprise the steps:
Determine the service quality QoS index of user's current business;
Judge whether needs adjustment target Initial Block Error Rate BLER according to the QoS index of determining, if then adjust, otherwise keep the initial BLER of current goal constant.
A kind of device that is used to adjust Block Error Rate comprises:
Measurement module is used for determining the service quality QoS index of user's current business;
Adjusting module is used for judging whether needs adjustment target Initial Block Error Rate BLER according to the QoS index of determining, if then adjust, otherwise keep the initial BLER of current goal constant.
The embodiment of the invention selects more accurately the MCS grade by adjusting the initial BLER of target, thereby improves data transmission quality or efficient.
Description of drawings
Fig. 1 is a main method flow chart of adjusting Block Error Rate in the embodiment of the invention;
Fig. 2 is the method flow diagram of the time delay of determining in the embodiment of the invention to eat dishes without rice or wine;
Fig. 3 is the method flow diagram of the packet loss of determining in the embodiment of the invention to eat dishes without rice or wine;
Fig. 4 is the initialized method flow diagram of the initial BLER of target in the embodiment of the invention;
The structure chart of Fig. 5 for installing in the embodiment of the invention.
Embodiment
The embodiment of the invention selects more accurately the MCS grade by adjusting the initial BLER of target, thereby improves data transmission quality or efficient.
Referring to Fig. 1, the main method flow process of adjusting Block Error Rate in the present embodiment is as follows:
Step 101: service quality (QoS) index of determining user's current business.
Step 102: judge whether needs adjustment target Initial Block Error Rate BLER according to the QoS index of determining, if then adjust, otherwise keep the initial BLER of current goal constant.
The QoS index comprises several factors in the present embodiment, as comprises the eat dishes without rice or wine packet loss and the time delay of eating dishes without rice or wine.The packet loss and the time delay of eating dishes without rice or wine of eating dishes without rice or wine can be got instantaneous value, perhaps average (or smooth value).At first introduce the process of the eat dishes without rice or wine packet loss and the time delay of eating dishes without rice or wine of determining user's current business below.
Referring to Fig. 2, the method flow of the time delay of determining in the present embodiment to eat dishes without rice or wine is as follows:
Setting the timing statistics window is T1, is the actual transmissions time delay coboundary that unit eated dishes without rice or wine in statistics a period of time with the Data Radio Bearer, and calculates its average delay.
Step 201: the actual propagation delay time of eating dishes without rice or wine in the statistics T1 duration.Preferable, begin statistics from the T1 duration of distance current time.For the packet of correct reception, the RLC that makes a start (Radio Link control) layer is the actual propagation delay time of eating dishes without rice or wine to the time delay of receiving end rlc layer; For the overtime packet of making a start, its time delay of eating dishes without rice or wine is according to the maximum allowable delay statistics of eating dishes without rice or wine; For the overtime packet of receiving terminal, add up according to the time delay of eating dishes without rice or wine of its reality.
Step 202: the upper bound of the actual time delay of determining to eat dishes without rice or wine.Concrete, all time delay values of eating dishes without rice or wine that obtain are sorted from small to large, form CDF (Cumulative Distribution Function, the cumulative distribution function) curve, and the pairing time delay of point of getting accumulated value y% (as being 95% or 98%) on this curve is designated as PacketDelay as the actual coboundary that reaches of the time delay of eating dishes without rice or wine of this section in the time
iPresent embodiment is follow-up will be according to the upper bound PacketDelay of the actual time delay of eating dishes without rice or wine
iJudge whether to need to adjust the initial BLER of target, make the final initial BLER of target that determines guarantee professional QoS demand as far as possible, what time delay was determined if eat dishes without rice or wine is less, then influence the accuracy of the initial BLER of target, if it is excessive, such as getting maximum, then do not have generality, influence throughput of system.
Can also calculate the average of the actual time delay of eating dishes without rice or wine.Concrete, all statistical samples in this section time T 1 calculate its linear average, are the average PktDelayAvg of the actual time delay of eating dishes without rice or wine
i
Referring to Fig. 3, the method flow of the packet loss of determining in the present embodiment to eat dishes without rice or wine is as follows:
Setting the timing statistics window is T2, is the actual packet loss of eating dishes without rice or wine in the statistics T2 of the unit duration with the Data Radio Bearer.
Step 301: the packet loss of eating dishes without rice or wine in the statistics T2 duration.In the T2 of time period nT2～(n+1), the packet loss η that eats dishes without rice or wine of carrying i
i(n) be:
Wherein, N in this section period
ReceivedRLC SDU (Service Data Unit, the Service Data Unit) number that correctly receives for receiving terminal rlc layer reality; N
SendBe this section RLC SDU number that transmitting terminal is eating dishes without rice or wine to transmit in the time; N
TimeoutFor this section in the period because the congested RLC SDU number of making a start overtime that causes of eating dishes without rice or wine, n is a positive integer.
Step 302: the packet loss of eating dishes without rice or wine that obtains is carried out smoothly the packet loss of eating dishes without rice or wine after obtaining smoothly.Concrete, pass through formula:
Carry out smoothly, wherein, PacketLossRatio
i(n) for carry the level and smooth later packet loss of eating dishes without rice or wine of i at time period n, its initial value is σ; The value of σ and QCI (QoS Class Indicator, the indication of QoS grade) the wrong bag of parameter packet loss (Packet Error Loss Rate, PELR), the load level of network is relevant, for example constantly in the initial access of this carrying, determine that according to the network load level the current packet loss coefficient of eating dishes without rice or wine is x, the PELR magnitude of this carrying is 10
-k, σ=x10 then
-k, the magnitude of σ is identical with the magnitude of PELR; β is a smoothing factor, and span is 0～1.
Determined to eat dishes without rice or wine packet loss (packet loss of eating dishes without rice or wine after level and smooth) and the time delay of eating dishes without rice or wine (upper bound of the actual time delay of eating dishes without rice or wine) afterwards then judges whether needs adjustment target Initial Block Error Rate BLER according to the eat dishes without rice or wine packet loss and the time delay of eating dishes without rice or wine.Earlier according to the packet loss of eating dishes without rice or wine judge still earlier according to the time delay of eating dishes without rice or wine judge all can, below to judge the process of adjusting the initial BLER of target that illustrates according to the time delay of eating dishes without rice or wine earlier.
At first judge PacketDelay
iWhether+θ is less than PDB
Δ, wherein, PacketDelay
iBe the propagation delay time of eating dishes without rice or wine, the time delay side-play amount that θ is default, (span is 0～100ms), PDB in θ 〉=0
ΔBe the maximum delay of eating dishes without rice or wine to allow.Because present embodiment adopts is the upper bound of actual time delay of eating dishes without rice or wine, with PDB
ΔHaving certain side-play amount to make in the time of relatively also can be less than PDB greater than the actual time delay of eating dishes without rice or wine in the upper bound
ΔAnd, PDB in the present embodiment
Δ=PDB-Δ
TPacket delay budget (Packet Delay Budget, PDB) define this data carried by data and wrapped in UE and PCEF (Policy and Charging Enforcement Function, the coboundary of the propagation delay time that allows policy, billing enhancement function entity) is used to support the data dispatch of link layer.Because PDB is a propagation delay time between PCEF and the UE, preferable mode is the time delay between the layer 2 to PCEF of deduction base station during the maximum delay therefore considering to eat dishes without rice or wine to allow, and the time delay between the layer 2 to PCEF of base station is designated as Δ
T(its typical value is 20ms).
If less than, i.e. PacketDelay
i+ θ＜PDB-Δ
T, judge then whether the packet loss of eating dishes without rice or wine eats dishes without rice or wine to ensure the target lower limit less than packet loss, if PacketLossRatio
i＜(1-ε
1) PktLS
T arg et, then the initial BLER of current goal is raised a default step delta
Step(the typical value of step-length is 1% or 2%), wherein, PacketLossRatio
iFor Fig. 3 flow process is final obtain level and smooth after the packet loss of eating dishes without rice or wine, (1-ε
1) PktLS
T arg etFor packet loss eats dishes without rice or wine to ensure target lower limit, PktLS
T arg etFor packet loss eats dishes without rice or wine to ensure targets threshold, ε
1(representative value is 0.2) is default lower limit amplitude, Δ
StepAnd ε
1Be nonnegative real number.If PacketLossRatio
i＞(1+ ε
2) PktLS
T arg et, then with m default step delta of the initial BLER downward modulation of current goal
Step, m is default positive integer, span 1～5, and representative value is 2, (1+ ε
2) PktLS
T arg etFor packet loss eats dishes without rice or wine to ensure target first upper limit, ε
2Be the first default upper limit amplitude, its typical value is 0.1.Present embodiment is in order to guarantee the stability of transmission quality and system as far as possible, and the amplitude of downward modulation is bigger, and the amplitude of rise is smaller.The packet loss of eating dishes without rice or wine is higher than packet loss and eats dishes without rice or wine to ensure the target lower limit and eat dishes without rice or wine to ensure on the target first in limited time less than packet loss, keeps the initial BLER of current goal constant.
If be not less than, i.e. PacketDelay
i+ θ 〉=PDB-Δ
T, judge then whether the packet loss of eating dishes without rice or wine eats dishes without rice or wine to ensure target second upper limit greater than packet loss, if PacketLossRatio
i＞(1+ ε
3) PktLS
T are et, then according to default step delta
StepDownward modulation target initial BLER, perhaps preferable, according to packet loss eat dishes without rice or wine to ensure targets threshold, eat dishes without rice or wine average delay and the actual maximum transmission times that allows adjust the initial BLER of current goal.Concrete, pass through formula
Adjust the initial BLER of current goal, wherein, BLER
T arg etBe the initial BLER of adjusted target, PktLS
T arg etFor packet loss eats dishes without rice or wine to ensure targets threshold, the permission maximum transmission times summation of this configuration when p represents to dispose automatic re-transmission (ARQ) and mixes re-transmission (HARQ) automatically, q is illustrated in maximum transmission times when being no more than the maximum delay of eating dishes without rice or wine to allow, and the minimum value among p and the q is represented the maximum retransmission of actual permission.If do not dispose ARQ or HARQ, then be as the criterion with q, perhaps p is made as obvious value greater than q.If PacketLossRatio
i＜(1+ ε
3) PktLS
T arg et, then keep the initial BLER of current goal constant.
When a plurality of data packet loaded were multiplexed into a transmission block, the initial BLER of current goal was the initial BLER of target of value minimum among the corresponding initial BLER of target of a plurality of carryings.
Wherein preferable, packet loss eats dishes without rice or wine to ensure that targets threshold is eat dishes without rice or wine packet loss coefficient and the wrong product that wraps packet loss (PELR), i.e. PktLS
T arg et=x * 10
-k, the x packet loss coefficient of representing to eat dishes without rice or wine, 10
-kBe the magnitude requirement of the PELR of current carrying, the magnitude of PELR requires and can obtain by the QCI index search table 1 of current business correspondence, and the example of a table 1 is as follows:
Table 1, standard QCI characteristic
The implication of each parameter is as follows in the last table:
Resource type (Resource Type) is used to indicate current bearer types to belong to still Non-GBR (non-assurance bit rate) business of GBR (Guaranteed Bit Rate guarantees bit rate).
Priority (Priority) characterizes current data carried by data grade of transmission, and more little then should the obtaining earlier more of value dispatched.
Packet delay budget (Packet Delay Budget, PDB) define this data carried by data and wrapped in UE and PCEF (Policy and Charging Enforcement Function, the coboundary of the propagation delay time that allows policy, billing enhancement function entity) is used to support the data dispatch of link layer.
(Packet Error Loss Rate PELR) has defined that the transmitting terminal link layer is handled to wrong bag packet loss but receiving terminal successfully is not delivered to the ratio coboundary of IP (Internet Protocol, the Internet Protocol) bag on upper strata.The PELR index that it may be noted that QCI definition only is on the magnitude, as in the actual transmission course 9 * 10
-2Packet loss remain and satisfy 10
-2PELR require.
QoS grade indication (QCI) is QoS attribute-bit of carrying, its correspondence above-mentioned one group of QoS index request.
In above-mentioned QCI parameter, resource type is generally used for the admittance control and the scheduling of wireless side; The processed strategy that priority is generally used for dispatching; Packet loss is then relevant with the link layer configuration usually with the time delay configuration, as determining configuration RLC (Radio Link control, Radio Link control) pattern is UM (Unacknowledged Mode, no affirmation mode) still be AM (Acknowledgement Mode, affirmation mode), whether open ARQ (Automatic Repeat request, automatic request retransmission) mechanism, HARQ (Hybrid ARQ, mix automatic request retransmission) maximum retransmission, and the initialization of the initial BLER of target in the present embodiment and dynamically adjustment or the like.
In the foundation or modification process of RB (radio bearer), the QCI sign of each carrying can be known in the base station, and and then knows the QoS demand parameter of carrying according to table 1.In this manner, when setting up for UE or revising any RB, the QoS demand of knowing all kinds of carryings that the base station can both be real-time.As: when system inserts a QCI grade is 1 VoIP (Voice over Internet Protocol, IP speech; IP: Internet protocol) business, as shown in Table 1, its PDB is 100ms, it is 10 that packet loss requires
-2Because PDB is a propagation delay time between PCEF and the UE, should deduct the time delay Δ between the layer 2 to PCEF of base station during the maximum delay therefore considering to eat dishes without rice or wine to allow
T, the maximum transmitted time delay of then eating dishes without rice or wine to allow is the 100-Δ
TMs, the packet loss of eating dishes without rice or wine to require to guarantee is for being no more than 10
-2Magnitude.
And for example: when system inserts a QCI grade is 8 FTP (File Transport Protocol, file transfer protocol (FTP)) business, and as shown in Table 1, its PDB is 300ms, and it is 10 that packet loss requires
-6Equally, eating dishes without rice or wine to need the maximum transmitted time delay of assurance is the 300-Δ
TMs, the packet loss of eating dishes without rice or wine to require to guarantee is for being no more than 10
-6Magnitude.
And for example, consider that the HARQ maximum transmission times of UE is p=4, QCI grade of UE access simultaneously is 3 carrying, its PDB=50ms, and the time delay of then eating dishes without rice or wine to allow is no more than 30ms, and maximum delay 30ms calculates according to eating dishes without rice or wine; Now hypothesis through statistics obtain this be carried on for the previous period in the time delay of on average eating dishes without rice or wine of transfer of data be 15ms, then in 30ms, can transmit twice at most, so q=2; This moment min{p, q}=2 then still supposes x=8, this moment, target initial BLER then was (8 * 10
-3)
1/2=8.9%.
Mentioned the packet loss coefficient of eating dishes without rice or wine when packet loss eats dishes without rice or wine to ensure targets threshold introducing, the packet loss coefficient of eating dishes without rice or wine in the present embodiment is current load level index η
PRB_ratioFunction, as
TH wherein
Low, TH
HighBe the load thresholding of system, typical value is TH
Low=0.3, TH
High=0.7.When system loading is low, ensure that for the packet loss of eating dishes without rice or wine target is (as 1 * 10 with lower PELR
-k), with perception and the professional QoS that promotes the user; When system loading is overweight, be that packet loss ensures that target is (as 8 * 10 with higher PELR
-k), to support more number of users, bigger capacity be provided.
Present embodiment provides the scheme that the initial BLER of target is dynamically adjusted, and the prerequisite of adjustment is that the initial BLER of target exists initial value, and this initial value can rule of thumb be determined.Present embodiment exists initial value more accurate in order to make the initial BLER of target, more meet professional and the QoS demand, determine that according to the service quality rating of current business and the service quality rating of presetting and the corresponding relation of the initial BLER of target there is initial value in the initial BLER of target.The initial value of the initial BLER of current goal is also according to one in the QCI grade of load level index, the packet loss coefficient of eating dishes without rice or wine, link layer configuration and carrying or multinomial definite.
When initialization,, therefore replace with its minimum value HARQ RTT owing to can't obtain the average delay of eating dishes without rice or wine; If can obtain to eat dishes without rice or wine average delay, then calculate with this parameter.The example of the initial value of the initial BLER of a kind of definite target is: PktDelayAvg
i=HARQ RTT with this average, disposes the initial value that calculates the initial BLER of target in conjunction with the RLC pattern of this carrying, the HARQ maximum transmission times that ARQ disposes (whether opening ARQ function and ARQ maximum retransmission), affiliated UE.For example, suppose that this RB considers that the permission maximum transmission times summation after ARQ, the HARQ is p time, and according to PktDelayAvg
i=HARQ RTT and PDB-Δ
TThe not overtime maximum transmission times of assurance that estimation obtains is q time, and then the initial value of the initial BLER of target is
Referring to Fig. 4, the initialized method flow of the initial BLER of target is as follows in the present embodiment:
Step 401: the load level index η that obtains current area
PRB_ratio, and the packet loss coefficient x that determines to eat dishes without rice or wine.
Step 402: the HARQ maximum transmission times that is retrieved as the current UE configuration.
Step 403: obtain the PELR of current carrying, and definite packet loss eats dishes without rice or wine to ensure targets threshold.
Step 404: obtain the rlc layer pattern configurations of current carrying, judge whether current data RB (radio bearer) adopts RLC AM pattern, if then continue step 405, otherwise continue step 406.
Step 405: obtain PDB, the ARQ configuration of current carrying, and, determine the actual maximum transmission times that allows in conjunction with the HARQ maximum transmission times of UE.Wherein, it is relevant with the ARQ configuration that the rlc layer pattern configurations is actually, because have only RLC AM (acknowledgement Mode, affirmation mode) just can dispose ARQ, other pattern can not dispose ARQ.Continue step 407.
Step 406: obtain the PDB of current carrying, and, determine the actual maximum transmission times that allows in conjunction with the HARQ maximum transmission times of UE.Continue step 407.
Step 407: maximum transmission times that allows according to reality and packet loss eat dishes without rice or wine to ensure that targets threshold determines the initial value of the initial BLER of target.
Repeat said process, until all Data-carryings that traveled through this UE.
The configuration of the maximum transmission times of HARQ is that unit carries out with UE in the LTE system, rather than carry out with the unit of being carried as, therefore, for the index that guarantees the PDB parameter is met, need readjust the actual maximum transmission times that can use of this carrying according to the PDB parameter of carrying.For example, the HARQ maximum transmitted of configuration UE is 4 times, is 3 carrying and this UE has inserted a QCI grade, and then its PDB=50ms is limited to the 50ms-Δ on the time delay of eating dishes without rice or wine to allow
T, and Δ
TNormally more than or equal to 20ms, therefore, the maximum transmitted time delay of eating dishes without rice or wine to allow is no more than 30ms.For TDD (Time Division Duplex, time division duplex) system, the RTT of its HARQ is generally 10ms, so the HARQ the number of transmissions that this carrying can be born is 3, and the requirement that does not reach the maximum transmission times of UE configuration just the phenomenon of overtime packet loss occurred.Therefore, in this case, should consider that its actual maximum transmission times that can allow is 3.
And for example, suppose that current system loading is higher, select the coefficient of x=8, then the target packet loss requirement of eating dishes without rice or wine is 8*10, because this service delay requires harsh, consider to be configured to RLC UM pattern, the initial BLER of target that this carrying then can be set is 20%, can guarantee then that in the scope of PDB delay requirement (the HARQ the number of transmissions is no more than 3 times) reaches the packet loss requirement of eating dishes without rice or wine is 8*10
-3Target.
Can obtain corresponding relation as shown in table 2 by flow process shown in Figure 4.
Table 2
Corresponding relation shown in the table 2 has been arranged, can directly obtain the initial value of the initial BLER of target according to QCI index and packet loss coefficient x look-up table 2.Table 2 should comprise the corresponding relation of the initial value of QCI index and all possible value of packet loss coefficient x and the initial BLER of target.UE index sign is used to identify UE, and ropeway carrying-rope tendering knowledge is used for identification service.At one of a concrete UE definite business, back 3 row in the application table 2 get final product.
Understood the implementation procedure of adjusting the initial BLER of target by above description, this process can realize that internal structure and the function to this device is introduced below by device.
Referring to Fig. 5, the device that is used to adjust Block Error Rate in the present embodiment comprises: measurement module 501 and adjusting module 502.
Adjusting module 502 is used for judging whether needs adjustment target Initial Block Error Rate BLER according to the QoS index of determining, if then adjust, otherwise keep the initial BLER of current goal constant.Concrete, adjusting module 502 is judged PacketDelay
i+ θ＜PDB
Δ, and the packet loss of eating dishes without rice or wine eats dishes without rice or wine to ensure under the target that less than packet loss, initial BLER raises a default step-length with current goal in limited time; Wherein, PacketDelay
iBe the propagation delay time of eating dishes without rice or wine of radio bearer i, θ is default time delay side-play amount, θ 〉=0, PDB
ΔBe the time delay coboundary of eating dishes without rice or wine to allow.Adjusting module 502 is judged PacketDelay
i+ θ＜PDB
Δ, and the packet loss of eating dishes without rice or wine eats dishes without rice or wine to ensure on the target first in limited time that greater than packet loss with m default step-length of the initial BLER downward modulation of current goal, m is default positive integer.Adjusting module 502 judge eat dishes without rice or wine propagation delay time after raising default time delay side-play amount still less than the maximum delay of eating dishes without rice or wine to allow, and the packet loss of eating dishes without rice or wine is higher than packet loss and eats dishes without rice or wine to ensure the target lower limit and eat dishes without rice or wine to ensure on the target first in limited time less than packet loss, keeps the initial BLER of current goal constant.Adjusting module 502 is judged the propagation delay time of eating dishes without rice or wine and still be not less than the maximum delay of eating dishes without rice or wine to allow after being raised default time delay side-play amount, and the packet loss of eating dishes without rice or wine eats dishes without rice or wine to ensure on the target second in limited time greater than packet loss, according to packet loss eat dishes without rice or wine to ensure targets threshold, eat dishes without rice or wine average delay and the actual maximum transmission times that allows adjust the initial BLER of current goal.Adjusting module 502 is judged the propagation delay time of eating dishes without rice or wine and still be not less than the maximum delay of eating dishes without rice or wine to allow after being raised default time delay side-play amount, and the packet loss of eating dishes without rice or wine is not more than packet loss and eats dishes without rice or wine to ensure on the target second and to keep the initial BLER of current goal constant in limited time.
Preferable, the maximum delay of eating dishes without rice or wine to allow is the poor of packet delay budget and network side time delay.
Adjusting module 502 passes through formula
Adjust the initial BLER of current goal, wherein, BLER
T arg etBe the initial BLER of adjusted target, PktLS
T arg etFor packet loss eats dishes without rice or wine to ensure targets threshold, the permission maximum transmission times summation of this configuration when p represents to dispose automatic re-transmission ARQ and the automatic re-transmission of mixing HARQ, q is illustrated in maximum transmission times when being no more than the maximum delay of eating dishes without rice or wine to allow, and the minimum value among p and the q is represented the maximum retransmission of actual permission.Packet loss eats dishes without rice or wine to ensure that targets threshold is eat dishes without rice or wine packet loss coefficient and the wrong product that wraps packet loss PELR, and the packet loss coefficient of wherein eating dishes without rice or wine is the function of current load level index.
The initial value of the initial BLER of current goal is to determine according to the corresponding relation of the service quality rating of current business and service quality rating of presetting and the initial BLER of target.
The initial value of the initial BLER of current goal is also according to one in the QCI grade of load level index, the packet loss coefficient of eating dishes without rice or wine, link layer configuration and carrying or multinomial definite.When a plurality of data packet loaded were multiplexed into a transmission block, the initial BLER of current goal was the initial BLER of target of value minimum among the corresponding initial BLER of target of a plurality of carryings.
The embodiment of the invention selects more accurately the MCS grade by adjusting the initial BLER of target, thereby improves data transmission quality or efficient.The embodiment of the invention is mainly adjusted the initial BLER of target by the eat dishes without rice or wine packet loss and the time delay of eating dishes without rice or wine, and obtains the initial BLER of only target with expectation.And the embodiment of the invention also limits the Rule of judgment of the eat dishes without rice or wine packet loss and the time delay of eating dishes without rice or wine, to improve the accuracy of judging.In order further to improve data transmission quality or efficient, the embodiment of the invention also provides the scheme of the initial BLER initial value of definite target, so that obtain the initial BLER of target more accurately.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software implementation example or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form that goes up the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of carrying out on computer or other programmable devices is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (18)
1. a method of adjusting Block Error Rate is characterized in that, may further comprise the steps:
Determine the service quality QoS index of user's current business;
Judge whether needs adjustment target Initial Block Error Rate BLER according to the QoS index of determining, if then adjust, otherwise keep the initial BLER of current goal constant.
2. the method for claim 1 is characterized in that, the QoS index comprises the eat dishes without rice or wine packet loss and the time delay of eating dishes without rice or wine.
3. the method for claim 1 is characterized in that,
Judge whether needs adjustment target Initial Block Error Rate BLER according to the QoS index of determining, if then adjust, otherwise keep the constant step of the initial BLER of current goal to comprise:
Judge PacketDelay
i+ θ＜PDB
Δ, and the packet loss of eating dishes without rice or wine eats dishes without rice or wine to ensure under the target that less than packet loss, initial BLER raises a default step-length with current goal in limited time; Wherein, PacketDelay
iBe the propagation delay time of eating dishes without rice or wine of radio bearer i, θ is default time delay side-play amount, θ 〉=0, PDB
ΔBe the time delay coboundary of eating dishes without rice or wine to allow; Perhaps
Judge PacketDelay
i+ θ＜PDB
Δ, and the packet loss of eating dishes without rice or wine eats dishes without rice or wine to ensure on the target first in limited time that greater than packet loss with m default step-length of the initial BLER downward modulation of current goal, m is default positive integer; Perhaps
Judge eat dishes without rice or wine propagation delay time after raising default time delay side-play amount still less than the maximum delay of eating dishes without rice or wine to allow, and the packet loss of eating dishes without rice or wine is higher than packet loss and eats dishes without rice or wine to ensure the target lower limit and eat dishes without rice or wine to ensure on the target first in limited time less than packet loss, keeps the initial BLER of current goal constant; Perhaps
Judge the propagation delay time of eating dishes without rice or wine and after raising default time delay side-play amount, still be not less than the maximum delay of eating dishes without rice or wine to allow, and the packet loss of eating dishes without rice or wine eats dishes without rice or wine to ensure on the target second in limited time greater than packet loss, according to packet loss eat dishes without rice or wine to ensure targets threshold, eat dishes without rice or wine average delay and the actual maximum transmission times that allows adjust the initial BLER of current goal; Perhaps
Judge the propagation delay time of eating dishes without rice or wine and after raising default time delay side-play amount, still be not less than the maximum delay of eating dishes without rice or wine to allow, and the packet loss of eating dishes without rice or wine is not more than packet loss and eats dishes without rice or wine to ensure on the target second and to keep the initial BLER of current goal constant in limited time.
4. method as claimed in claim 3 is characterized in that, the maximum delay of eating dishes without rice or wine to allow is the poor of packet delay budget and network side time delay.
5. method as claimed in claim 3 is characterized in that, eats dishes without rice or wine to ensure that according to packet loss the step that targets threshold and the actual maximum retransmission that allows are adjusted the initial BLER of current goal comprises: pass through formula
Adjust the initial BLER of current goal, wherein, BLER
T arg etBe the initial BLER of adjusted target, PktLS
T arg etFor packet loss eats dishes without rice or wine to ensure targets threshold, the permission maximum transmission times summation of this configuration when p represents to dispose automatic re-transmission ARQ and the automatic re-transmission of mixing HARQ, q is illustrated in maximum transmission times when being no more than the maximum delay of eating dishes without rice or wine to allow, and the minimum value among p and the q is represented the maximum retransmission of actual permission.
6. method as claimed in claim 5 is characterized in that, packet loss eats dishes without rice or wine to ensure that targets threshold is eat dishes without rice or wine packet loss coefficient and the wrong product that wraps packet loss PELR, and the packet loss coefficient of wherein eating dishes without rice or wine is the function of current load level index.
7. the method for claim 1 is characterized in that, the initial value of the initial BLER of current goal is to determine according to the corresponding relation of the service quality rating of current business and service quality rating of presetting and the initial BLER of target.
8. method as claimed in claim 7 is characterized in that, the initial value of the initial BLER of current goal is also according to one in the QCI grade of load level index, the packet loss coefficient of eating dishes without rice or wine, link layer configuration and carrying or multinomial definite.
9. the method for claim 1 is characterized in that, when a plurality of data packet loaded were multiplexed into a transmission block, the initial BLER of current goal was the initial BLER of target of value minimum among the corresponding initial BLER of target of a plurality of carryings.
10. a device that is used to adjust Block Error Rate is characterized in that, comprising:
Measurement module is used for determining the service quality QoS index of user's current business;
Adjusting module is used for judging whether needs adjustment target Initial Block Error Rate BLER according to the QoS index of determining, if then adjust, otherwise keep the initial BLER of current goal constant.
11. device as claimed in claim 10 is characterized in that, the QoS index comprises the eat dishes without rice or wine packet loss and the time delay of eating dishes without rice or wine.
12. device as claimed in claim 10 is characterized in that adjusting module is judged PacketDelay
i+ θ＜PDB
Δ, and the packet loss of eating dishes without rice or wine eats dishes without rice or wine to ensure under the target that less than packet loss, initial BLER raises a default step-length with current goal in limited time; Wherein, PacketDelay
iBe the propagation delay time of eating dishes without rice or wine of radio bearer i, θ is default time delay side-play amount, θ 〉=0, PDB
ΔBe the time delay coboundary of eating dishes without rice or wine to allow; Perhaps
Adjusting module is judged PacketDelay
i+ θ＜PDB
Δ, and the packet loss of eating dishes without rice or wine eats dishes without rice or wine to ensure on the target first in limited time that greater than packet loss with m default step-length of the initial BLER downward modulation of current goal, m is default positive integer; Perhaps
Adjusting module judge eat dishes without rice or wine propagation delay time after raising default time delay side-play amount still less than the maximum delay of eating dishes without rice or wine to allow, and the packet loss of eating dishes without rice or wine is higher than packet loss and eats dishes without rice or wine to ensure the target lower limit and eat dishes without rice or wine to ensure on the target first in limited time less than packet loss, keeps the initial BLER of current goal constant; Perhaps
Adjusting module is judged the propagation delay time of eating dishes without rice or wine and still be not less than the maximum delay of eating dishes without rice or wine to allow after being raised default time delay side-play amount, and the packet loss of eating dishes without rice or wine eats dishes without rice or wine to ensure on the target second in limited time greater than packet loss, according to packet loss eat dishes without rice or wine to ensure targets threshold, eat dishes without rice or wine average delay and the actual maximum transmission times that allows adjust the initial BLER of current goal; Perhaps
Adjusting module is judged the propagation delay time of eating dishes without rice or wine and still be not less than the maximum delay of eating dishes without rice or wine to allow after being raised default time delay side-play amount, and the packet loss of eating dishes without rice or wine is not more than packet loss and eats dishes without rice or wine to ensure on the target second and to keep the initial BLER of current goal constant in limited time.
13. device as claimed in claim 12 is characterized in that, the maximum delay of eating dishes without rice or wine to allow is the poor of packet delay budget and network side time delay.
14. device as claimed in claim 12 is characterized in that adjusting module passes through formula
Adjust the initial BLER of current goal, wherein, BLER
T arg etBe the initial BLER of adjusted target, PktLS
T arg etFor packet loss eats dishes without rice or wine to ensure targets threshold, the permission maximum transmission times summation of this configuration when p represents to dispose automatic re-transmission ARQ and the automatic re-transmission of mixing HARQ, q is illustrated in maximum transmission times when being no more than the maximum delay of eating dishes without rice or wine to allow, and the minimum value among p and the q is represented the maximum retransmission of actual permission.
15. device as claimed in claim 14 is characterized in that, packet loss eats dishes without rice or wine to ensure that targets threshold is eat dishes without rice or wine packet loss coefficient and the wrong product that wraps packet loss PELR, and the packet loss coefficient of wherein eating dishes without rice or wine is the function of current load level index.
16. device as claimed in claim 10 is characterized in that, the initial value of the initial BLER of current goal is to determine according to the corresponding relation of the service quality rating of current business and service quality rating of presetting and the initial BLER of target.
17. device as claimed in claim 16 is characterized in that, the initial value of the initial BLER of current goal is also according to one in the QCI grade of load level index, the packet loss coefficient of eating dishes without rice or wine, link layer configuration and carrying or multinomial definite.
18. device as claimed in claim 10 is characterized in that, when a plurality of data packet loaded were multiplexed into a transmission block, the initial BLER of current goal was the initial BLER of target of value minimum among the corresponding initial BLER of target of a plurality of carryings.
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