CN102263608B - Method and system for adaptive modulation and coding - Google Patents
Method and system for adaptive modulation and coding Download PDFInfo
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Abstract
The invention provides a method and system for adaptive modulation and coding. In the method, a base station detects a data frame error rate of a user; when the data frame error rate meets a preset frame error rate condition, a new modulation and coding set (MCS) is determined according to MCS transform probability information, and the user is indicated to use the MCS. In the invention, the base station can directly select a new MCS for the user according to the MCS transform probability information, so that the efficiency and effectiveness of the control on the MCS of the user can be improved and the user can be indicated to adopt reasonable MCS in time, and thus the system performance is improved. Besides, the probability that a user uses MCS which cannot reach required demodulation performance is very small, and the probability value that the MCS is used as an objective MCS in the MCS transform probability information is very small or zero, so that the base station cannot select the MCS for the user, thus the problem of the sudden rise of the frame error rate of the user in the traditional method can be avoided.
Description
Technical field
The present invention relates to wireless communication system, particularly a kind of method and system of adaptive coding and modulating.
Background technology
Long Term Evolution (Long Term Evolution, abbreviation LTE) project is 3G (Third Generation) Moblie technology (3rd-generation, abbreviation 3G) evolution of technology, wherein improve and strengthened the aerial access technology of 3G, adopt OFDM (Orthogonal Frequency Division Multiplexing, be called for short OFDM) and multiple-input and multiple-output (Multiple-Input Multiple-Out-put, abbreviation MIMO) as the sole criterion of its wireless network evolution.
Adaptive coding and modulating (Adaptive Modulation and Coding, abbreviation AMC) basic principle is exactly to change and select suitable modulation and coded system (Modulation andCoding Set according to wireless channel, be called for short MCS), the MCS of the most suitable up link of user is selected and distributes in base station according to the instantaneous channel quality status of user and frame error rate.Different corresponding different modulation and the encryption algorithms of MCS, in agreement and in practical application, adopt an integer to modulate and coded system for representing as modulation and coded system value (also can be considered index value), different modulation and coded system value are corresponding to different modulation and coded system, and the network element in system is all known the mapping relations of modulation and coded system value and concrete modulation and coded system.
In AMC system, general user uses the modulation system of high-order and higher code rate in the reasonable situation of channel quality, and in bad channel quality, adopts lower modulation coding mode.
Power is controlled and to be used for subscribers carrier interference-to-noise ratio (CarrierInterference and Noise Ratio that receiver is received, abbreviation CINR) reach a desired value, when being less than target CINR, user's CINR increases user's transmitted power, when user's CINR is greater than targeted customer's CINR, reduce user's transmitted power.
The prior art relevant with the present invention provides a kind of method of adaptive coding and modulating, take LTE up link as example, and its implementation process is as follows:
Base station receives subscriber equipment (User Equipment, be called for short UE) uplink service signal, measure the CINR of current time, this CINR is mapped to MCS, if active user's frame error rate is less than 10%, for representing that increasing a correction value in the value of MCS obtains new MCS.If be greater than 10%, for representing that deducting a correction value in the value of MCS obtains new MCS.And current MCS is sent to UE by down control channel, UE encodes and modulates with this MCS after receiving.
But, in the extraordinary situation of channel quality, subscriber-coded demodulation ability cannot reach certain specific MCS, in frame error rate, is less than in 10%, if MCS is increased to this specific MCS, can cause the frame error rate of user data to raise suddenly, cause this user's flow to decline.
In LTE system, the MCS that receives base station transmission due to user needs some times to using this MCS to send data, add base station measurement equivalence carrier-in-interference noise ratio and scheduling time, making this MCS is not the channel quality of very enough accurate description UE delivery times, the mode that increases correction value or minimizing correction value in said method easily causes the concussion of frame error rate, causes this user's flow to decline.
In LTE system, under multipath channel, can there is the poor situation of channel quality in user, and user adopts too low MCS can make user's business not reach requirement.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method and system of adaptive coding and modulating, improves and controls user's modulation and the efficiency of coded system and validity, and indicating user adopts reasonably modulation and coded system in time, improves systematic function.
In order to solve the problems of the technologies described above, the invention provides a kind of method of adaptive coding and modulating, comprise: when base station detection user's data frame error rate meets default frame error rate condition, according to modulation and coded system transition probability information, determine new modulation and coded system, indicate described user to use this modulation and coded system.
Further, said method also has following characteristics:
In described modulation and coded system transition probability information, comprise that user modulates from source modulation and coded system value I to object and the corresponding probable value P of conversion of coded system value J
i, J, wherein I, J are for representing the integer of modulation and coded system, I≤M, and J≤M, M is that base station can be modulation and the coded system value of described user configured maximum.
Further, said method also has following characteristics:
Described modulation and coded system transition probability information are upgraded after adjusting described user's transmitting power in described base station; The concrete mode of upgrading described modulation and coded system transition probability information is: described base station is described user's Offered target modulation and coded system value U, described base station is adjusted after described user's transmitting power, corresponding modulation and the coded system value of carrier-in-interference noise ratio of determining described user by carrier-in-interference noise ratio and the mapping relations of modulation and coded system value is K, and it is that U object is modulated and the probable value P of the conversion correspondence that coded system value is K that described base station increases the modulation of source in described modulation and coded system transition probability information and coded system value
u, K.
Further, said method also has following characteristics:
The method that described user's transmitting power is adjusted in described base station is: by the mapping relations of carrier-in-interference noise ratio and modulation and coded system value, determine that the carrier-in-interference noise ratio corresponding with described target modulation and coded system value U is target carrier interference-to-noise ratio L; When the carrier-in-interference noise ratio that described base station records described user's reality is N, with the power increment of L-N, adjust user's transmitting power.
Further, said method also has following characteristics:
In round figures, described base station increases probable value P to the probable value of modulation and coded system conversion
u, Kon Shi Yuan probable value basis, increase by a fixed integer value.
Further, said method also has following characteristics:
User's data frame error rate meets the data frame error rate that default frame error rate condition refers to user and is less than default frame error rate thresholding; According to modulation and coded system transition probability information, determine that new modulation and coded system specifically refer to: from source modulation and coded system value, be to select a probable value P the probable value that U object is modulated and coded system value is U+1 to M
u, R, this probable value is not 0 o'clock, using the modulation of object corresponding to this probable value and modulation corresponding to coded system value R and coded system as described new modulation and coded system; Or; User's data frame error rate meets default frame error rate condition and refers to: user's data frame error rate is greater than default frame error rate thresholding; According to modulation and coded system transition probability information, determine that new modulation and coded system refer to: from source modulation and coded system value, be that U object is modulated and coded system value is to select a probable value P 1 to U-1 probable value
u, S, this probable value is not 0 o'clock, using the modulation of object corresponding to this probable value and modulation corresponding to coded system value S and coded system as described new modulation and coded system.
Further, said method also has following characteristics:
Selection mode while selecting a probable value is for selecting maximum or in the probable value that is greater than default probable value thresholding optional one.
In order to solve the problems of the technologies described above, the invention provides a kind of system of adaptive coding and modulating, comprise base station, described base station comprises transition probability information storage module, frame error rate judge module, adaptive coding and modulating module; Described transition probability information storage module, for storing modulation and coded system transition probability information; Described frame error rate judge module, while meeting default frame error rate condition for detection of user's data frame error rate, sends and triggers message to adaptive coding and modulating module; Described adaptive coding and modulating module, triggers after message for receiving, according to described modulation and coded system transition probability information, determines new modulation and coded system, indicates described user to use this modulation and coded system.
Further, said system also has following characteristics:
In described modulation and coded system transition probability information, comprise that user modulates from source modulation and coded system value I to object and the corresponding probable value P of conversion of coded system value J
i, J, wherein I, J are for representing the integer of modulation and coded system, I≤M, and J≤M, M is that base station can be modulation and the coded system value of described user configured maximum.
Further, said system also has following characteristics:
Described base station also comprises the carrier-in-interference noise ratio measurement module being connected with adaptive coding and modulating module, the power control module being connected with carrier-in-interference noise ratio measurement module; Described adaptive coding and modulating module comprises updating block; Described carrier-in-interference noise ratio measurement module, adjusts user's transmitting power for controlling described power control module; Also, for after user's transmitting power being adjusted at the described power control module of control, to described adaptive coding and modulating module, send described user's carrier-in-interference noise ratio; Described power control module, adjusts for the transmitting power to user; Described updating block, be used for upgrading described modulation and coded system transition probability information, concrete, receive after described user's carrier-in-interference noise ratio, corresponding modulation and the coded system value of carrier-in-interference noise ratio of determining described user by carrier-in-interference noise ratio and the mapping relations of modulation and coded system value is K, with reference to the described user's that arranged target modulation and coded system value U, increase source modulation and coded system value in described modulation and coded system transition probability information and be that U object is modulated and the probable value P of the conversion correspondence that coded system value is K
u, K, and indicate described transition probability information storage module to upgrade probable value P
u, K; Described transition probability information storage module, upgrades probable value P according to the indication of described adaptive coding and modulating module
u, K.
Further, said system also has following characteristics:
Described carrier-in-interference noise ratio measurement module, also for passing through the mapping relations of carrier-in-interference noise ratio and modulation and coded system value, determine that the carrier-in-interference noise ratio corresponding with described target modulation and coded system value U is target carrier interference-to-noise ratio L, when the carrier-in-interference noise ratio that records actual user's reality is N, notify the transmitting power of described power control module with the power increment adjustment user of L-N.
Further, said system also has following characteristics:
Described adaptive coding and modulating module, also for increasing probable value P
u, Kon Shi Yuan probable value basis, increase by a fixed integer value.
Further, said system also has following characteristics:
Described adaptive coding and modulating module comprises modulation and coding mode selection unit; Described frame error rate judge module, while being also less than default frame error rate thresholding for detection of user's data frame error rate, sending and triggers message and indicate frame error rate to be less than default frame error rate thresholding to adaptive coding and modulating module; Described modulation and coding mode selection unit, for receiving after described triggering message, are to select a probable value P the probable value that U object is modulated and coded system value is U+1 to M from source modulation and coded system value
u, R, this probable value is not 0 o'clock, using the modulation of object corresponding to this probable value and modulation corresponding to coded system value R and coded system as described new modulation and coded system.
Further, said system also has following characteristics:
Described adaptive coding and modulating module comprises modulation and coding mode selection unit; Described frame error rate judge module, while being also greater than default frame error rate thresholding for detection of user's data frame error rate, sending and triggers message and indicate frame error rate to be greater than default frame error rate thresholding to adaptive coding and modulating module; Described modulation and coding mode selection unit, for receiving after described triggering message, are that U object is modulated and coded system value is to select a probable value P 1 to U-1 probable value from source modulation and coded system value
u, S, this probable value is not 0 o'clock, using the modulation of object corresponding to this probable value and modulation corresponding to coded system value S and coded system as described new modulation and coded system.
In the present invention base station with reference to modulation and coded system transition probability information directly for user selects new modulation and coded system, can improve and control user's modulation and the efficiency of coded system and validity, indicating user adopts reasonably modulation and coded system in time, improves systematic function.
In addition, user uses the be beyond one's reach probability of MCS of demodulation performance very little, in modulation and coded system transition probability information, this MCS is very little or be 0 as the probable value of object MCS, user's the unexpected problem raising of the error rate can, for user selects this MCS, not avoided making in existing method in base station.
In the present invention according to modulation and coded system transition probability information directly for user selects new modulation and coded system, the target MCS that has comprised user in modulation and coded system transition probability information and the conversion record of actual MCS, and the general larger value of probability of selecting while selecting, can be fast for user chooses the MCS that meets its channel situation, make user obtain suitable MCS as far as possible, reduce the duration that the process of user MCS is adjusted in base station, improve systematic function.
Accompanying drawing explanation
Fig. 1 is the structure chart of adaptive Coded Modulation Systems;
Fig. 2 is the method schematic diagram that carries out MCS selection in adaptive code modulation method.
Embodiment
(the Physical Uplink Share Channel of PUSCH in LTE system, Uplink Shared Channel) MCS that UE is used is by PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel) DCI (Downlink Control Information in, Downlink Control Information) form 0 sends, after user receives this MCS, with this MCS, carry out coded modulation, on PUSCH, send data.
As shown in Figure 1, base station in the system of adaptive coding and modulating, transition probability information storage module, frame error rate judge module, adaptive coding and modulating module, the carrier-in-interference noise ratio measurement module being connected with adaptive coding and modulating module, the power control module being connected with carrier-in-interference noise ratio measurement module.Adaptive coding and modulating module comprises updating block and coding mode selection unit.
Transition probability information storage module, for storing modulation and coded system transition probability information.
Frame error rate judge module, while meeting default frame error rate condition for detection of user's data frame error rate, sends and triggers message to adaptive coding and modulating module.
Adaptive coding and modulating module, triggers after message for receiving, according to described modulation and coded system transition probability information, determines new modulation and coded system, indicates described user to use this modulation and coded system.
In native system, in described modulation and coded system transition probability information, comprise that user modulates from source modulation and coded system value I to object and the corresponding probable value P of conversion of coded system value J
i, J, wherein I, J are for representing the integer of modulation and coded system, I≤M, and J≤M, M is that base station can be modulation and the coded system value of described user configured maximum.
In native system, can realize user's transmitting power is adjusted after to state modulation and coded system transition probability information upgrade, implementation method is as follows:
Described carrier-in-interference noise ratio measurement module is adjusted user's transmitting power for controlling described power control module; Concrete, by the mapping relations of carrier-in-interference noise ratio and modulation and coded system value, determine that the carrier-in-interference noise ratio corresponding with described target modulation and coded system value U is target carrier interference-to-noise ratio L, when the carrier-in-interference noise ratio that records actual user's reality is N, notify the transmitting power of described power control module with the power increment adjustment user of L-N.Described carrier-in-interference noise ratio measurement module also, for after user's transmitting power being adjusted at the described power control module of control, sends described user's carrier-in-interference noise ratio to described adaptive coding and modulating module;
Described power control module, adjusts for the transmitting power to user;
Described updating block, also for upgrading described modulation and coded system transition probability information, concrete, receive after described user's carrier-in-interference noise ratio, corresponding modulation and the coded system value of carrier-in-interference noise ratio of determining described user by carrier-in-interference noise ratio and the mapping relations of modulation and coded system value is K, with reference to the described user's that arranged target modulation and coded system value U, increase source modulation and coded system value in described modulation and coded system transition probability information and be that U object is modulated and the probable value P of the conversion correspondence that coded system value is K
u, K, and indicate described transition probability information storage module to upgrade probable value P
u, K;
Described transition probability information storage module, upgrades probable value P according to the indication of described adaptive coding and modulating module
u, Kprobable value P
u, Kin the time of in round figures, increase probable value P
u, Ktime can on former probable value basis, increase by a fixed integer value, for example, fixed integer value is 1.In another kind of implementation, can by MCS transition probability information, take each probable value that source modulation and coded system value be U be set to 1, i.e. sequence P=[p
u, 1... p
u, U, p
u, U+1... p
u, M] in each probable value and be 1, increase P
u, Kvalue time, can be to increase fixedly real number value mode, can also be by P
u, Kbe multiplied by a mode that is greater than 1 real number coefficient, etc.
In native system, user's data frame error rate is less than default frame error rate thresholding, can carry out in the following manner MCS selection:
Described frame error rate judge module, while being less than default frame error rate thresholding for detection of user's data frame error rate, sending and triggers message and indicate frame error rate to be less than default frame error rate thresholding to adaptive coding and modulating module;
Described modulation and coding mode selection unit, for receiving after described triggering message, are to select a probable value P the probable value that U object is modulated and coded system value is U+1 to M from source modulation and coded system value
u, R, this probable value is not 0 o'clock, using the modulation of object corresponding to this probable value and modulation corresponding to coded system value R and coded system as described new modulation and coded system.
In native system, user's data frame error rate is greater than default frame error rate thresholding, can carry out in the following manner MCS selection:
Described frame error rate judge module, while being greater than default frame error rate thresholding for detection of user's data frame error rate, sending and triggers message and indicate frame error rate to be greater than default frame error rate thresholding to adaptive coding and modulating module;
Described modulation and coding mode selection unit, for receiving after described triggering message, are that U object is modulated and coded system value is to select a probable value P 1 to U-1 probable value from source modulation and coded system value
u, S, this probable value is not 0 o'clock, using the modulation of object corresponding to this probable value and modulation corresponding to coded system value S and coded system as described new modulation and coded system.
In native system, user's data frame error rate equals default frame error rate thresholding, and modulation and coding mode selection unit are using modulation corresponding to U and coded system as described new modulation and coded system.
Modulation and the coding mode selection unit selection mode while selecting a probable value is selection maximum or in the probable value that is greater than default probable value thresholding optional one.From a plurality of probable values, searching peaked algorithm has multiplely, and for example comparatively conventional binary search algorithm and sequential search algorithm etc. repeat no more herein.
The method of adaptive coding and modulating comprises: when base station detection user's data frame error rate meets default frame error rate condition, according to modulation and coded system transition probability information, determine new modulation and coded system, indicate described user to use this modulation and coded system.
In embodiment, in MCS transition probability information, comprise that user modulates from source modulation and coded system value I to object and the corresponding probable value P of conversion of coded system value J
i, J, wherein I, J are for representing the integer of modulation and coded system, I≤M, and J≤M, M is that base station can be modulation and the coded system value of described user configured maximum.
MCS transition probability information can represent also can represent in sequence mode with matrix-style, not limit this expression mode in the present invention.Probable value P
i, Jcan be that integer can be also real number, can represent that user modulates from source modulation and coded system value I to object and the transition probability of coded system value J.
MCS transition probability information can, according to user's the attribute MCS transition probability information fixing for each user arranges, also can be upgraded in base station after the transmitting power of adjusting user.Specifically describe the situation of upgrading modulation and coded system transition probability information after base station adjustment user's transmitting power below.
The process that user's transmitting power is adjusted in base station comprises following content: base station is that described user's Offered target modulation and coded system value U are (concrete, can be according to user's business demand setting), by the mapping relations of CINR and MCS, determine that the target CINR corresponding with U value is L; Base station receives user's upstream data, and the CINR that records user's reality is N, adjusts user's transmitting power with the power increment of L-N (dB).
Base station is adjusted after user's transmitting power, receive user uplink data, measure CINR, by carrier-in-interference noise ratio and the mapping relations of modulation and coded system value, determine that current modulation and coded system value that this CINR is corresponding are K, MCS transition probability information is upgraded in base station, increases source modulation and coded system value in described modulation and coded system transition probability information and be that U object is modulated and the probable value P of the conversion correspondence that coded system value is K
u, K.Probable value P
u, Kin the time of in round figures, base station increases probable value P
u, Ktime can on former probable value basis, increase by a fixed integer value, for example, fixed integer value is 1.In another kind of implementation, can by MCS transition probability information, take each probable value that source modulation and coded system value be U be set to 1, i.e. sequence P=[p
u, 1... p
u, U, p
u, U+1... p
u, M] in each probable value and be 1, increase P
u, Kvalue time, can be to increase fixedly real number value mode, can also be by P
u, Kbe multiplied by a mode that is greater than 1 real number coefficient, etc.In the present invention, be not limited to the mode of the above-mentioned increase probable value of enumerating.
One frame error rate thresholding can be set when frame error rate condition is set, and base station carries out obtaining error code information after demodulation code to the upstream data receiving, and calculates the frame error rate of user's current time.
As shown in Figure 2, to meet default frame error rate condition be that user's data frame error rate is less than default frame error rate thresholding to user's data frame error rate.In the case, according to MCS transition probability information, determine that the concrete grammar of new modulation and coded system is: from source modulation and coded system value, be to select a probable value P the probable value that U object is modulated and coded system value is U+1 to M
u, R, from sequence P=[p
u, U+1... p
u, M] the middle probable value P that selects
u, R, U < R≤M, this probable value is not 0 o'clock, using the modulation of object corresponding to this probable value and modulation corresponding to coded system value R and coded system as described new modulation and coded system.This probable value is 0 o'clock, using modulation corresponding to U and coded system as described new modulation and coded system.
It can also be that user's data frame error rate is greater than default frame error rate thresholding that user's data frame error rate meets default frame error rate condition.In the case, according to modulation and coded system transition probability information, determine that the concrete grammar of new modulation and coded system is: from source modulation and coded system value, be that U object is modulated and coded system value is to select a probable value P 1 to U-1 probable value
u, S, from sequence P=[p
u, 1... p
u, U-1] the middle probable value P that selects
u, R, 1 < S≤U-1, this probable value is not 0 o'clock, using the modulation of object corresponding to this probable value and modulation corresponding to coded system value S and coded system as described new modulation and coded system.This probable value is 0 o'clock, using modulation corresponding to U and coded system as described new modulation and coded system.
While selecting probable value in the probable value sequence that source modulation and coded system value are U, can be in the probable value that is greater than default probable value thresholding optional one.Preferably selection mode is for selecting maximum.Select peaked mode, make base station can choose fast optimum MCS, shorten the process of adjusting user MCS, for user chooses the MCS that is applicable to current channel quality, reduce system interaction process.From a plurality of probable values, searching peaked algorithm has multiplely, and for example comparatively conventional binary search algorithm and sequential search algorithm etc. repeat no more herein.
When user's data frame error rate equals default frame error rate thresholding, using modulation corresponding to U and coded system as described new modulation and coded system.
In above-mentioned implementation, user uses the be beyond one's reach probability of MCS of demodulation performance very little, in modulation and coded system transition probability information, this MCS is very little or be 0 as the probable value of object MCS, user's the unexpected problem raising of the error rate can, for user selects this MCS, not avoided making in existing method in base station.
In the present invention according to modulation and coded system transition probability information directly for user selects new modulation and coded system, the target MCS that has comprised user in modulation and coded system transition probability information and the conversion record of actual MCS, and the general larger value of probability of selecting while selecting, can be fast for user chooses the MCS that meets its channel situation, make user obtain suitable MCS as far as possible, reduce the duration that the process of user MCS is adjusted in base station, improve systematic function.
Below with specific embodiment explanation the present invention.
Specific embodiment one:
Base station can be 28 for described user configured maximum modulation and coded system value, and frame error rate thresholding is set to 10%.In this specific embodiment, the method for adaptive coding and modulating comprises the following steps:
Step 1, base station is 12 according to current this user's of traffic set of user target MCS value, the target CINR that the mapping relations by CINR and MCS obtain user is 3.5dB.
Step 2, base station receives user's upstream data, and the CINR measuring is 2.5dB, with power increment value 1dB, improves user's transmitting power.
Step 3, base station receives user's upstream data, and the CINR measuring is 3, and by the mapping table of inquiry CINR and MCS, obtaining MCS is 8, by P in MCS transition probability sequence
12,8value add 1.
Step 4, demodulation code is carried out to the Uplink Shared Channel data that receive in base station, obtains error code information, and the frame error rate of calculating the current moment is 7%.
Step 5, judges that current frame error rate is less than frame error rate thresholding 10%, at sequence P=[P
12,13, P
12,14... P
12,28] to search maximum be P
12,14, judgement P
12,14whether be 0, if not 0, the base station selected MCS value of current time is 14, if 0, the MCS value that current base station is selected is 12.
Specific embodiment two:
Base station can be 28 for described user configured maximum modulation and coded system value, and frame error rate thresholding is set to 10%.In this specific embodiment, the method for adaptive coding and modulating comprises the following steps:
Step 1 is to the step of upgrading transition probability sequence in 3 and step 1 in specific embodiment one to 3 identical.
Step 4, demodulation code is carried out to the Uplink Shared Channel data that receive in base station, obtains error code information, and the frame error rate of calculating the current moment is 13%.
Step 5, judges that current frame error rate is greater than frame error rate thresholding 10%, at sequence P=[P
12,1... P
12,11] to search maximum be P
12,7, judgement P
12,14whether be 0, if not 0, the base station selected MCS value of current time is 7, if 0, the MCS value that current base station is selected is 12.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. a method for adaptive coding and modulating, is characterized in that,
When base station detection user's data frame error rate meets default frame error rate condition, according to modulation and coded system transition probability information, determine new modulation and coded system, indicate described user to use this modulation and coded system;
Described modulation and coded system transition probability information are upgraded after adjusting described user's transmitting power in described base station;
The concrete mode of upgrading described modulation and coded system transition probability information is: described base station is described user's Offered target modulation and coded system value U, described base station is adjusted after described user's transmitting power, corresponding modulation and the coded system value of carrier-in-interference noise ratio of determining described user by carrier-in-interference noise ratio and the mapping relations of modulation and coded system value is K, and it is that U object is modulated and the probable value P of the conversion correspondence that coded system value is K that described base station increases the modulation of source in described modulation and coded system transition probability information and coded system value
u,K.
2. the method for claim 1, is characterized in that,
In described modulation and coded system transition probability information, comprise that user modulates from source modulation and coded system value I to object and the corresponding probable value P of conversion of coded system value J
i,J, wherein I, J are for representing the integer of modulation and coded system, I≤M, and J≤M, M is that base station can be modulation and the coded system value of described user configured maximum.
3. the method for claim 1, is characterized in that,
The method that described user's transmitting power is adjusted in described base station is: by the mapping relations of carrier-in-interference noise ratio and modulation and coded system value, determine that the carrier-in-interference noise ratio corresponding with described target modulation and coded system value U is target carrier interference-to-noise ratio L; When the carrier-in-interference noise ratio that described base station records described user's reality is N, with the power increment of L-N, adjust user's transmitting power.
4. the method for claim 1, is characterized in that,
In round figures, described base station increases probable value P to the probable value of modulation and coded system conversion
u,Kon Shi Yuan probable value basis, increase by a fixed integer value.
5. the method as described in claim 1,2,3 or 4, is characterized in that,
User's data frame error rate meets the data frame error rate that default frame error rate condition refers to user and is less than default frame error rate thresholding; According to modulation and coded system transition probability information, determine that new modulation and coded system specifically refer to: from source modulation and coded system value, be to select a probable value P the probable value that U object is modulated and coded system value is U+1 to M
u,R, this probable value is not 0 o'clock, using the modulation of object corresponding to this probable value and modulation corresponding to coded system value R and coded system as described new modulation and coded system;
Or;
User's data frame error rate meets default frame error rate condition and refers to: user's data frame error rate is greater than default frame error rate thresholding; According to modulation and coded system transition probability information, determine that new modulation and coded system refer to: from source modulation and coded system value, be that U object is modulated and coded system value is to select a probable value P 1 to U-1 probable value
u,S, this probable value is not 0 o'clock, using the modulation of object corresponding to this probable value and modulation corresponding to coded system value S and coded system as described new modulation and coded system.
6. method as claimed in claim 4, is characterized in that,
Selection mode while selecting a probable value is for selecting maximum or in the probable value that is greater than default probable value thresholding optional one.
7. a system for adaptive coding and modulating, comprises base station, it is characterized in that, described base station comprises transition probability information storage module, frame error rate judge module, adaptive coding and modulating module;
Described transition probability information storage module, for storing modulation and coded system transition probability information;
Described frame error rate judge module, while meeting default frame error rate condition for detection of user's data frame error rate, sends and triggers message to adaptive coding and modulating module;
Described adaptive coding and modulating module, triggers after message for receiving, according to described modulation and coded system transition probability information, determines new modulation and coded system, indicates described user to use this modulation and coded system;
Described base station also comprises the carrier-in-interference noise ratio measurement module being connected with adaptive coding and modulating module, the power control module being connected with carrier-in-interference noise ratio measurement module; Described adaptive coding and modulating module comprises updating block;
Described carrier-in-interference noise ratio measurement module, adjusts user's transmitting power for controlling described power control module; Also, for after user's transmitting power being adjusted at the described power control module of control, to described adaptive coding and modulating module, send described user's carrier-in-interference noise ratio;
Described power control module, adjusts for the transmitting power to user;
Described updating block, be used for upgrading described modulation and coded system transition probability information, concrete, receive after described user's carrier-in-interference noise ratio, corresponding modulation and the coded system value of carrier-in-interference noise ratio of determining described user by carrier-in-interference noise ratio and the mapping relations of modulation and coded system value is K, with reference to the described user's that arranged target modulation and coded system value U, increase source modulation and coded system value in described modulation and coded system transition probability information and be that U object is modulated and the probable value P of the conversion correspondence that coded system value is K
u,K, and indicate described transition probability information storage module to upgrade probable value P
u,K;
Described transition probability information storage module, upgrades probable value P according to the indication of described adaptive coding and modulating module
u,K.
8. system as claimed in claim 7, is characterized in that,
In described modulation and coded system transition probability information, comprise that user modulates from source modulation and coded system value I to object and the corresponding probable value PI of conversion of coded system value J, J, wherein I, J are for representing the integer of modulation and coded system, I≤M, J≤M, M is that base station can be modulation and the coded system value of described user configured maximum.
9. system as claimed in claim 7, is characterized in that,
Described carrier-in-interference noise ratio measurement module, also for passing through the mapping relations of carrier-in-interference noise ratio and modulation and coded system value, determine that the carrier-in-interference noise ratio corresponding with described target modulation and coded system value U is target carrier interference-to-noise ratio L, when the carrier-in-interference noise ratio that records actual user's reality is N, notify the transmitting power of described power control module with the power increment adjustment user of L-N.
10. system as claimed in claim 7, is characterized in that,
Described adaptive coding and modulating module, also for increasing probable value P
u,Kon Shi Yuan probable value basis, increase by a fixed integer value.
11. systems as described in claim 7,8,9 or 10, is characterized in that, described adaptive coding and modulating module comprises modulation and coding mode selection unit;
Described frame error rate judge module, while being also less than default frame error rate thresholding for detection of user's data frame error rate, sending and triggers message and indicate frame error rate to be less than default frame error rate thresholding to adaptive coding and modulating module;
Described modulation and coding mode selection unit, for receiving after described triggering message, are to select a probable value P the probable value that U object is modulated and coded system value is U+1 to M from source modulation and coded system value
u,R, this probable value is not 0 o'clock, using the modulation of object corresponding to this probable value and modulation corresponding to coded system value R and coded system as described new modulation and coded system.
12. systems as described in claim 7,8,9 or 10, is characterized in that, described adaptive coding and modulating module comprises modulation and coding mode selection unit;
Described frame error rate judge module, while being also greater than default frame error rate thresholding for detection of user's data frame error rate, sending and triggers message and indicate frame error rate to be greater than default frame error rate thresholding to adaptive coding and modulating module;
Described modulation and coding mode selection unit, for receiving after described triggering message, are that U object is modulated and coded system value is to select a probable value P 1 to U-1 probable value from source modulation and coded system value
u,S, this probable value is not 0 o'clock, using the modulation of object corresponding to this probable value and modulation corresponding to coded system value S and coded system as described new modulation and coded system.
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| CN106888071B (en) * | 2017-02-20 | 2020-08-07 | 华为技术有限公司 | Method and device for adjusting coding rate |
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