CN101877626B - Adaptive modulation and coding method, system and device - Google Patents
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Abstract
The invention provides an adaptive modulation and coding method. The method comprises the following steps that: a transmitting node transmits downlink data by using a puncture physical resource block (PRB) and a complete PRB; the transmitting node determines the transmission block size TBS transmitted to a receiving node and a total number of the PRB pairs of the number of the complete PRB pairs for dispatching and the number of the puncture PRB pairs according to carried services; the transmitting node dispatches and transmits the downlink data for the receiving node and transmits the total number of the adopted PRB pairs, the position information and the MCS sequence number to the receiving node; the receiving node calculates the total resource number; and the receiving node calculates the number of the converted complete PRB pairs according to the total resource number and determines the TBS of the downlink data according to the calculated number of the converted complete PRB pairs and the TBS sequence number determined through the MCS sequence number. Through the method, all or part of special conditions when the puncture of the PRB transmits the downlink data can be processed by using the adaptive processing process and resource of a conventional normal subframe, so that the effects of simpleness and high efficiency are achieved.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of adaptive modulation and coding method, system and device.
Background technology
3-G (Generation Three mobile communication system) (3G) adopts CDMA (Code-Division Multiple Access, code division multiple access) mode, supports multimedia service, can have higher competitiveness in several years of future.But in order to ensure within the longer time, keeping this competitiveness, 3GPP (Third GenerationPartnership Project, third generation partner plan) started LTE (LongTerm Evolution, the Long Term Evolution) research project of 3G wireless interface technology.And AMC (Adaptive Modulation andCoding, adaptive modulation and coding) technology has become one of key technology of LTE.
AMC is the adaptive modulation and coding technology, be a kind of can be by modulation and the coded system of adjusting adaptively the transmission of data, compensate the influence of fading that causes to received signal owing to channel variation, thereby improve physical layer link self adaptation (Link Adaptation) technology of the signal-to-noise performance of signal.The implementation of AMC is: system is according to self physical layer ability and channel variance situation, set up the coded modulation form set (MCS of a transformat, Modulation And Coding Scheme), transformat among each MCS comprises the parameters such as the transmission of data code rate and modulation system, when channel condition changed, system can select the different transpost formats corresponding with channel condition to come adaptive channel to change.In order better understanding to be arranged to the present invention, below will simply introduce the more used basic technologies of the present invention.
At present, the LTE system determines to support 2 kinds of frame structures, is applicable to the first kind frame structure of FDD (Frequency DivisionDuplex, Frequency Division Duplexing (FDD)) system, with the Equations of The Second Kind frame structure that is applicable to TDD (Time Division Duplex, time division duplex) system.In order more deep understanding to be arranged to the present invention, below will simply introduce respectively first kind frame structure and Equations of The Second Kind frame structure.
As shown in Figure 1, be the first kind frame structure schematic diagram of FDD system in the prior art.The frame length of this first kind radio frames is 10ms, is comprised of 20 time slots, and every time slot (slot) length is 0.5ms, as shown in Figure 1, and mark from 0 to 19.Two continuous time slots are defined as a subframe (subframe), and subframe i is comprised of time slot 2i and 2i+1, i=0 wherein, and 1 ..., 9.
As shown in Figure 2, be the Equations of The Second Kind frame structure schematic diagram of TDD system in the prior art.The frame length of this Equations of The Second Kind radio frames also is 10ms, and every radio frames at first is divided into the field of 2 5ms.Each field is divided into the subframe of 5 1ms.According to concrete time slot ratio configuration, subframe 1 and subframe 6 can be configured to the particular service subframe, and (descending pilot frequency DwPTS, protection interval GP and ascending pilot frequency UpPTS) forms by 3 special time slots.Wherein, DwPTS is the same with common descending sub frame, also can be used for the bearing downlink business datum.
In LTE (Long Term Evolution) system, PRB (PhysicalResource Block based on common subframe, Physical Resource Block) structure is carried out the MCS design, the method that recycling is looked into TBS (TransportBlock Size, transmission block size) table realizes the AMC process.Wherein, PRB is the base unit of the scheduling of resource of LTE.As shown in Figure 3, schematic diagram for PRB and RE in the prior art ascending time slot, PRB and RE in the descending time slot are similar with it, wherein, the least resource granularity that time domain OFDM (OrthogonalFrequency Division Multiplexing, OFDM) symbol and subcarrier in frequency domain are determined is called RE (Resource Element).At present, agreement is defined as time domain 0.5ms with the complete PRB of a common subframe, the running time-frequency resource granularity of frequency domain 180kHz, be corresponding 7 the OFDM symbols of time domain (for short CP) or 6 OFDM symbols (for long CP), a running time-frequency resource granularity of corresponding 12 subcarriers of frequency domain.
Yet in the LTE system, the PRB resource that in some particular service subframes, also can have some brachymemmas (puncture), such as the DwPTS (as shown in Figure 2) in the particular service subframe of TDD system, perhaps because synchronizing channel, broadcast channel are carried out the PRB of brachymemma etc.The PRB of brachymemma can equally with complete PRB in the common subframe be used for the bearing downlink data in these particular service subframes, but because existing TBS form is to design according to complete PRB, wherein most of option has no idea to directly apply to the PRB of these brachymemmas.
The shortcoming of prior art is: because the TBS table of agreement regulation is according to complete PRB design at present, wherein most of option is for brachymemma PRB and inapplicable.Simultaneously both for UE dispatches complete PRB, also dispatch the situation of brachymemma PRB for NodeB for it, if the employing method the same with complete PRB carried out AMC, then can cause having a long way to go the appearance that leads to errors with the required MCS of reality.
In order more deep understanding to be arranged to the above-mentioned shortcoming of prior art, below will be that example is simply introduced to the AMC of prior art, but the PRB that is understood that the following brachymemma of mentioning is a kind of situation that occurs in the prior art, can not represent the situation of the PRB of all brachymemmas in the prior art.At first, carry out the MCS design based on the PRB structure of common subframe, for the LTE system, Traffic Channel is supported QPSK at present, three kinds of modulation systems of 16QAM and 64QAM, these three kinds of modulation systems cooperate with the specific coding code check and have 29 kinds of MCS, implicit mapping TBS and modulation system when 3 kinds of MCS are preserved for retransmitting, totally 32 MCS options, it can be indicated by 5 bits.System selects best modulation system and channel encoding rate to come the transmission of data according to measurement and prediction to channel, to be implemented in maximum system throughput under the prerequisite that guarantees certain transmission quality.The indication of concrete MCS can be carried out with reference to following table 1 and table 2.
Table 1 is the tabulation of MCS sequence number corresponding modulating mode and TBS sequence number
Wherein, the MCS indication information of 5 bits in dispatch indication sequence number I
MCS, according to table 1, can obtain concrete modulation system such as Q
mShown in, the sequence number of TBS is by I
TBSIndication.But concrete TBS needs by I
TBSWith the PRB number N that takies
PRBThe associating decision, PRB number N
PRBCan obtain according to the resource indication information of dispatch, scheduling is take PRB-pair as basic granularity.Obtaining I according to table 1
TBSAfter, also need according to I
TBSWith PRB number N
PRBQuestion blank 2 obtains final TBS.The size of this table 2 is 27 * 110, but only shows for convenience of description N
PRBPart for 1-9.
Table 2 is the TBS table
TBS shown in the upper table 2 table is to designing according to the complete PRB of general service, wherein, in order to consider the expense of control signal and pilot tone, and the factor such as length CP, agreement is finally descending to be used for the carrying data according to every PRB to (PRB-pair) 120 RE, and wherein 120 RE are equivalent to 10 OFDM symbols.Therefore table 2 is also inapplicable for the PRB of brachymemma, especially when the symbolic number that cuts out is many, if determine according to table 2, then can cause having a long way to go with the required MCS of reality, causes the UE decoding error.
Below will be described defects by way of example, suppose that UE obtains I according to the descending scheduling signaling
MCS=14, the quantity that the PRB of indication is right is 2, and for the generic downlink subframe, the processing procedure of UE is as follows: according to table 1, according to I
MCS=14 table look-up obtains corresponding modulation system Q
m=4, i.e. 16QAM; The sequence number I that TBS is corresponding
TBS=13; According to table 2, check in TBS=488 again.Then the chances are for actual code check: (488+24)/(120 * 4 * 2)=0.533, namely actual MCS is { 16QAM, 0.533}.
If but that correspondence is DwPTS, be 9 OFDM symbols in this length of supposing DwPTS, so except control signal, outside the expense of synchronizing channel and pilot tone, the PRB that can be actually used in the carrying data among this DwPTS is roughly 5 * 12=60RE.Therefore if guarantee identical transmission quality, namely MCS need to be similarly that { 16QAM, 0.533} carrys 488 data bits, and NodeB (base station) then can be 4 PRB pair of this UE scheduling arrangement so.Yet the I that this moment, if UE indicated according to signaling
MCS=14 and N
PRB=4 what look into that TBS table obtains will be 1000 bits rather than 488 actual bits, thereby cause the operation of UE mistake.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, particularly solves and can't utilize existing MCS and TBS form in the prior art, the situation of dispatching complete PRB and brachymemma PRB for UE is simultaneously carried out the defective of AMC.
For achieving the above object, one aspect of the present invention proposes a kind of adaptive modulation and coding method, may further comprise the steps: sending node selects brachymemma Physical Resource Block PRB and complete PRB in order to transmitting downlink data; Described sending node is defined as the transmission block size TBS of described receiving node transmission according to the business of carrying and is the right quantity of total PRB of the right quantity sum of the right quantity of the complete PRB that dispatches and brachymemma PRB; Described sending node is described receiving node scheduled transmission downlink data according to the TBS that determines, and right quantity, positional information and the MCS sequence number of total PRB that will adopt sends to described receiving node; Described receiving node calculates total resource quantity according to the situation of described total PRB right quantity, positional information and each brachymemma PRB; Described receiving node calculates the right quantity of complete PRB after the conversion according to total resource quantity, and according to the right quantity of the complete PRB after the described conversion of calculating and the TBS that determines described downlink data by the TBS sequence number that described MCS sequence number is determined.
Wherein, described sending node is base station node B or evolution base station eNodeB, and described receiving node is via node RN or user equipment (UE); Perhaps described sending node is RN, and described receiving node is UE.
The present invention also proposes a kind of adaptive modulation and coding system, at least one receiving node that comprises the service of sending node and described sending node, described sending node, be used for selecting brachymemma PRB and complete PRB in order to transmitting downlink data, and be defined as the transmission block size TBS of described receiving node transmission and be the right quantity of total PRB of the right quantity sum of the right quantity of the complete PRB that dispatches and brachymemma PRB according to the business of carrying, and be described receiving node scheduled transmission downlink data according to the TBS that determines, and the right quantity of total PRB that will adopt, positional information and MCS sequence number send to described receiving node; Described receiving node, be used for calculating total resource quantity according to the situation of described total PRB right quantity, positional information and each brachymemma PRB, and calculate the right quantity of complete PRB after the conversion according to total resource quantity, and according to the right quantity of the complete PRB after the described conversion of calculating with determine the TBS of described downlink data by the TBS sequence number that described MCS sequence number is determined.
The present invention also proposes a kind of sending node, comprises selecting module, scheduling parameter determination module, scheduling sending module, and described selection module is used for selecting brachymemma PRB and complete PRB in order to transmitting downlink data; Described scheduling parameter determination module is used for being defined as the transmission block size TBS of described receiving node transmission and being the right quantity of total PRB of the right quantity sum of the right quantity of the complete PRB that dispatches and brachymemma PRB according to the business of carrying; Described scheduling sending module, being used for according to the TBS that determines is described receiving node scheduled transmission downlink data, and right quantity, positional information and the MCS sequence number of total PRB that will adopt sends to described receiving node.
The present invention also proposes a kind of receiving node, comprises receiver module, indication information acquisition module, complete PRB Logarithmic calculation module and TBS determination module, and described receiver module is used for receiving sending node by the downlink data of complete PRB and brachymemma PRB transmission; Described indication information acquisition module is used for obtaining the MCS sequence number of dispatch indication and total right quantity of PRB, and wherein said total right quantity of PRB is right quantity and the right quantity sum of brachymemma PRB of complete PRB of dispatching; Described complete PRB Logarithmic calculation module is used for calculating total resource quantity according to the right quantity of described total PRB and the situation of each brachymemma PRB, and calculates the right quantity of complete PRB after the conversion according to total resource quantity; Described TBS determination module is used for according to the right quantity of the complete PRB after the described conversion of calculating and the TBS that determines described downlink data by the TBS sequence number that described MCS sequence number is determined.Wherein, receiving node can be RN or UE.
Can be on the self-adaptive processing process and resource base of utilizing existing common subframe by the present invention, processes all or part of special circumstances during by brachymemma PRB transmitting downlink data, realize simply, efficiently.
The aspect that the present invention adds and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or the additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the first kind frame structure schematic diagram of FDD system in the prior art;
Fig. 2 is the Equations of The Second Kind frame structure schematic diagram of TDD system in the prior art;
Fig. 3 is the schematic diagram of PRB and RE in the prior art ascending time slot;
Fig. 4 is the position view of main broadcast channel, auxiliary synchronous signals and master sync signal in the one embodiment of the invention FDD system;
Fig. 5 is the position view of main broadcast channel, auxiliary synchronous signals and master sync signal in the one embodiment of the invention TDD system;
Fig. 6 is the flow chart of one embodiment of the invention adaptive modulation and coding method;
Fig. 7 is the structure chart of one embodiment of the invention adaptive modulation and coding system.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein identical or similar label represents identical or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
The present invention mainly is, utilize self-adaptive processing process and the resource of existing common subframe, do not changing existing { TBS, MCS} form (such as table 1 and table 2), and need not increases new { TBS into brachymemma PRB, on the basis of MCS} form, by the conversion to the right quantity of PRB of NodeB and corresponding UE, solve in the prior art technological deficiency that can't realize AMC when for NodeB the data of UE being dispatched situation on brachymemma PRB and complete PRB simultaneously.
Detailed process simply is described below: at first when NodeB is the UE scheduling resource, if NodeB is former because UE has selected brachymemma PRB and the common transmitting downlink data of complete PRB according to quality etc., then NodeB need to be according to the size (such as the ratio of OFDM symbolic number or the ratio of RE) of brachymemma PRB to complete PRB, with the right quantity N of complete PRB of NodeB scheduling
PRBThe quantity N right with brachymemma PRB
P-PRBSum N '
PRBAnd other relevant PRB information exchanges cross dispatch and send to UE, and wherein relevant PRB information comprises carrying this time concrete PRB number and corresponding sequence number of transmission.UE is according to the N ' in the dispatch
PRB(the quantity sum that complete PRB is right with brachymemma PRB) and the relevant described NodeB of PRB information calculations are total number of resources (for example OFDM symbolic number or RE number) of its scheduling, and UE calculates the right quantity N of complete PRB according to total number of resources
PRBThereby, can search that existing { TBS, the MCS} form carries out AMC.
What this also needed to further specify be, for the right quantity N of complete PRB
PRBRight quantity N with brachymemma PRB
P-PRBBetween conversion need to consider the size (size of complete PRB is fixed) of brachymemma PRB, the therefore right quantity N of complete PRB
PRBRight quantity N with brachymemma PRB
P-PRBBetween the conversion relation can change because of the size of brachymemma PRB.Complete PRB such as present agreement regulation comprises 120 RE (or comprising 10 OFDM symbols), if brachymemma PRB comprises 5 OFDM symbols, then N
P-PRB=2N
PRBIf brachymemma PRB comprises 30 RE, then N
P-PRB=2.5N
PRBTherefore, we can find out the difference along with brachymemma PRB size, and it also is different from conversion relation between the complete PRB number, and owing to causing that in the LTE system reason of brachymemma PRB is varied, causes the size of brachymemma PRB also different, so N
PRBWith N
P-PRBBetween conversion relation in this application also can't be exhaustive; although the present invention can describe the main brachymemma PRB situation that exists in the LTE system in subsequent embodiment; yet therefore can not be and the present invention only is limited among the cited brachymemma PRB situation of the present invention, the situation of other brachymemmas PRB also should be protection range of the present invention and contains.In addition, also may carry out some and simplify process when converting, but not rely on magnitude relationship between brachymemma PRB and the complete PRB fully, this type of conversion mode also should be protection range of the present invention and contains equally.
In order further understanding to be arranged to following embodiment of the present invention; at first the main situation that causes the PRB brachymemma that exists and the size of corresponding brachymemma PRB thereof in the present LTE system are concluded; but what also need again to illustrate is that the following scene of enumerating can not summarize that all cause the situation of PRB brachymemma in the present LTE system; other situations that cause the PRB brachymemma are similar with it; ordinary skill can be carried out similar processing to other brachymemma situations according to the present invention, also should be protection range of the present invention and contains.
1, the brachymemma PRB that is produced by the length of DwPTS
The TDD system of LTE supports multiple particular service sub-frame configuration at present, DwPTS, and Gp and UpPTS take the 1ms time altogether.But under every kind of configuration, the length of DwPTS may be different, and according to present configuration, the possible length of DwPTS comprises:
Table 3 is the tabulation of the lower DwPTS length of different special time slot configurations
According to the difference configuration of the length of above-mentioned table 3DwPTS, consider again the expense of control signal and pilot tone, the OFDM symbolic number N that the PRB of brachymemma is right
Symbol, P-PRBAs shown in the table:
Table 4 is the right symbolic number tabulation of brachymemma PRB
| Type | Available OFDM symbolic number, L P-PRB | N symbol，P-PRB |
| Short CP1 | 12 | 8 |
| Short CP2 | 11 | 7 |
| |
10 | 6 |
| Short CP4 | 9 | 5 |
| Short CP5 | 3 | - |
| |
10 | 8 |
| Long CP2 | 9 | 7 |
| Long CP3 | 8 | 6 |
| Long CP4 | 3 | - |
When being 12 OFDM symbolic numbers (the short-and-medium CP1 situation of corresponding table 4) such as the DwPTS length for configuration in the table 3, after the expense of removal control signal and pilot tone, can be used for 8 the OFDM symbolic numbers that are about of the transmission of data, so N
Symbol, P-PRB=8.Other situations in the table 4 are similar with it, do not repeat them here.
1, broadcasted and synchronizing channel affects the brachymemma PRB of generation
In FDD system and TDD system, broadcasted and understood with the impact of synchronizing channel that some is different, below will be introduced respectively in illustrated mode.
1) FDD system
As shown in Figure 4, be the position view of main broadcast channel, auxiliary synchronous signals and master sync signal in the one embodiment of the invention FDD system, this schematic diagram to be lacking CP as example, and its length is totally 14 OFDM symbols, and long CP situation is similar with it, does not repeat them here.For 72 subcarriers (being equivalent to 6PRB) in the middle of FDD system subframe 0 and the subframe 5, because the existence of synchronizing channel or main broadcast channel, the OFDM symbolic number that causes can be used for the transmission of data reduces.If for example control channel takies 2 sign resources, main broadcast channel takies 4 symbols, and auxiliary synchronous signals and master sync signal respectively take an OFDM symbol, and then to can be used for the OFDM symbolic number of transfer of data be 14-2-4-1-1=6 to each PRB.That is to say the system for FDD, its subframe 0 and subframe 5 are the particular service subframe, and its PRB is brachymemma.
For the situation of FDD system, available OFDM symbolic number L in subframe 0 and the subframe 5
P-PRB, and the corresponding OFDM symbolic number of brachymemma PRB N after consideration control signal and the pilot-frequency expense
Symbol, P-PRBBe listed as follows:
Table 5 is the right symbolic number N of brachymemma PRB in the FDD system
Symbol, P-PRBTabulation
2) TDD system
As shown in Figure 5, be the position view of main broadcast channel, auxiliary synchronous signals and master sync signal in the one embodiment of the invention TDD system, this schematic diagram is also lacking CP as example equally, and its length is totally 14 OFDM symbols.But the difference of TDD system and above-mentioned FDD system is, master sync signal is not in subframe 0 and subframe 5, but in the DwPTS of subframe 1 and subframe 6.Therefore for the situation of TDD system, available OFDM symbolic number L in subframe 0, subframe 5 and the subframe 6
P-PRB, and the corresponding OFDM symbolic number of brachymemma PRB N after consideration control signal and the pilot-frequency expense
Symbol, P-PRBBe listed as follows:
Table 6 is the right symbolic number N of brachymemma PRB in the TDD system
Symbol, P-PRBTabulation
3, the brachymemma PRB that is produced by SRS (Sounding Reference Signaling, detecting pilot frequency signal)
If for sub-frame of uplink configuration transmitting SRS, then last OFDM symbol of the PRB of PUSCH will be struck off.But owing to only lose an OFDM symbol, the OFDM symbol that loses unlike front two kinds of situations is more, therefore it is not carried out emphasis in the present invention and describes.But the processing to above-mentioned two situations that those of ordinary skills can propose according to the present invention equally, the problem of the brachymemma PRB that solution SRS produces.
Can find out from the situation of above-mentioned cited generation brachymemma PRB, can lose more OFDM symbolic number owing to be subject to the brachymemma PRB of the configuration of DwPTS length and broadcasting and synchronizing channel impact generation, its impact on system is also corresponding larger, therefore as a preferred embodiment of the present invention, convert in order to raise the efficiency the situation of only considering above-mentioned several generation brachymemma PRB.But should be understood that other situations that produce brachymemma PRB also can solve with reference to the embodiment that the present invention proposes, because other situations that produce brachymemma PRB are more, therefore give unnecessary details at this no longer one by one.
Need to prove for embodiments of the invention, not only be suitable for base station node B or evolution base station eNodeB to the situation that UE sends, also be suitable for the situation that via node RN sends to UE, perhaps eNodeB is to the situation of RN transmission.The situation that will send take NodeB to UE in following examples is carried out concrete introduction as example, and other above-mentioned situations can be carried out with reference to following examples, and in the following embodiments, sending node is NodeB, and receiving node is UE.
As shown in Figure 6, be embodiment of the invention adaptive modulation and coding method flow diagram, may further comprise the steps:
Step S601, NodeB are that UE selects brachymemma PRB and complete PRB transmitting downlink data.In one embodiment of the invention, every complete PRB is used for the carrying data to comprising 120 RE, and wherein 120 RE are equivalent to 10 OFDM symbols.Brachymemma PRB may be by the configuration of DwPTS length or broadcasting and synchronizing channel impact generation, and as described above in Example, the quantity of OFDM symbol or RE also exists difference among the brachymemma PRB that Different Effects produces, and does not repeat them here.
Step S602, NodeB are defined as the TBS of UE transmission according to the business of carrying and are the right quantity of total PRB of the right quantity sum of the right quantity of the complete PRB that dispatches and brachymemma PRB.Wherein, according to the difference of institute's bearer service, its mode of determining transmission TBS size is not identical yet.
For example for the business of fixed data bag size (for example VoIP is professional), the TBS size of its transmission is fixing, can not cut apart, therefore need to determine the TBS size according to the business of carrying, determine the concrete right quantity N of PRB that carries this data block according to TBS size and channel quality information again
PRBAfterwards, NodeB is that UE selects complete PRB and brachymemma PRB transmitting downlink data according to the resource that can dispatch, namely NodeB for this UE has dispatched a part of complete PRB (N
PRB1), also dispatch a part of brachymemma PRB for this UE, can have multiple varigrained PRB pair among the brachymemma PRB in this section, for example can adopt to be broadcasted with synchronizing channel affects the brachymemma PRB of generation and/or the brachymemma PRB that is produced by the length of DwPTS, perhaps other brachymemmas PRB.Wherein, need to obtain the right quantity of brachymemma PRB by conversion, the brachymemma PRB that for example produces for the length by DwPTS, according to
Or
Wherein, N
PRBFor the right quantity of complete PRB (is removed the complete PRB (N of a part that has dispatched for this UE
PRB1) outside remaining), N
P-PRBFor converting the right quantity of rear brachymemma PRB, N
Symbol, P-PRBBe OFDM symbolic number shared among the brachymemma PRB, N
RE, P-PRBBe RE number shared among the brachymemma PRB.The quantity that total PRB is right is the complete PRB (N of a part that dispatches for this UE
PRB1) the quantity N right with the rear brachymemma PRB of conversion
P-PRBSum.
Yet, business (for example data service) for fixed data bag size, its total volume of transmitted data is larger, therefore need to cut apart according to the TBS that each transmission can be carried, so NodeB is according to channel quality information and the resource selection TBS size that can dispatch.At first NodeB determines the right quantity of quantity that the complete PRB of scheduling is right and brachymemma PRB according to the resource that can dispatch after, suppose that NodeB is that to dispatch the right quantity of complete PRB be N to UE
PRB1, be simultaneously the right quantity N of UE scheduling brachymemma PRB
P-PRB, NodeB calculates the right quantity of complete PRB and the right total right quantity of PRB of quantity sum of brachymemma PRB.The quantity N that NodeB is right to brachymemma PRB
P-PRBConvert and obtain converting the right quantity N of rear complete PRB
PRB, afterwards again according to N
PRB1With N
PRBSum is tabled look-up and is obtained TBS, and the packet of scheduling TBS size transmits at the PRB that determines.Particularly, the conversion relation between the right quantity of the quantity that complete PRB is right and brachymemma PRB can be determined according to the size of brachymemma PRB.For example, can be according to formula
Or
Calculate.
Step S603, NodeB is UE scheduled transmission downlink data according to the TBS that determines, and right quantity and the MCS sequence number of total PRB that will adopt, positional information and relevant system information send to UE.
Step S604, the quantity that UE is right according to total PRB, the situation of positional information and each brachymemma PRB is calculated total resource quantity.Particularly, UE can learn that according to positional information in the right quantity of total PRB, which PRB is brachymemma PRB, and which PRB is complete PRB, and calculates total resource quantity according to the situation of each brachymemma PRB.In one embodiment of the invention, a code word is scheduled in multiple varigrained PRB to carrying on the resource, that is to say that total like this resource quantity can be passed through formula for UE has dispatched multiple brachymemma PRB
Calculate, wherein, R
iBe the resource granularity of every kind of PRB, N
iBe the number of every kind of PRB, i=1 ... n, n are total right quantity of PRB, namely for complete PRB, R
iBe 120 RE or 10 OFDM symbols, for brachymemma PRB, R
iBe variable, as previously mentioned, it can change because causing the situation difference of brachymemma PRB.
In another embodiment of the present invention, for the purpose of simplifying, can in the PRB of multiple granularity resource, determine the wherein resource of least resource granularity, and all according to the situation of minimum PRB total resource quantity be converted that for example total resource quantity can be formula R
Min* N
PRB, wherein, R
MinBe the PRB resource granularity of minimum particle size, N
PRBBe the right quantity of total PRB.Although sacrificed like this some precision, simplified widely calculating.Can find out that from foregoing description can calculate in several ways total resource quantity in the situation that does not break away from inventive concept, other similar methods also should be included within protection scope of the present invention.
Step S605, UE calculates the right quantity of complete PRB after the conversion according to total resource quantity, and according to the right quantity of the complete PRB after the conversion of calculating and the TBS that determines downlink data by the TBS sequence number that described MCS sequence number is determined.Particularly, in one embodiment of the invention, if total resource quantity is
, then the right quantity of complete PRB after the conversion can be
Wherein, R
0Be the right resource quantity of common PRB, 12 OFDM symbols or 120 RE, N ' can think in corresponding LTE system
PRBBe the right quantity of complete PRB after the conversion,
Expression rounds operation downwards to x.Afterwards, looking into the TBS that the MCS table is determined downlink data according to the right quantity of complete PRB after the conversion.In a preferred embodiment of the invention, for fear of N '
PRBThe sheet value is 0, and the quantity that the complete PRB after the conversion is right can also be expressed as
For simplifying the mode of processing in above-described embodiment, the quantity that the complete PRB after the conversion is right can be expressed as
Wherein, R
MinBe the PRB resource granularity of minimum particle size, N
PRBBe the right quantity of total PRB, N '
PRBSheet is the right quantity of complete PRB after converting,
Expression rounds operation downwards to x.
Certainly in an embodiment of the present invention, also available other modes are calculated the right quantity of complete PRB after the conversion, as by formula N
p+ N '
PRBCalculate, wherein N
pFor the right quantity of complete PRB (is the N in above-described embodiment
PRB1),
R
iBe the resource granularity of brachymemma PRB, N
iNumber for brachymemma PRB.
Certainly the right quantity of complete PRB of how calculating more than after the conversion only is the specific embodiment that the present invention proposes; above-described embodiment that those skilled in the art can propose according to the present invention is made the calculating that is equal to, and these are equal to calculating and all should be included within protection scope of the present invention based on same invention thought.
As shown in Figure 7, be embodiment of the invention adaptive modulation and coding system construction drawing, this system comprises at least one UE 200 of NodeB 100 and NodeB 100 services.NodeB 100 is used to UE 200 to select complete PRB and brachymemma PRB transmitting downlink data, and be defined as the TBS of UE 200 transmission and be the right quantity of total PRB of the right quantity sum of the right quantity of the complete PRB that dispatches and brachymemma PRB according to the business of carrying, and be UE 200 scheduled transmission downlink datas according to the TBS that determines, and right quantity and the MCS sequence number of total PRB that will adopt sends to UE 200.UE 200 is used for calculating total resource quantity according to the right quantity of total PRB and the situation of each brachymemma PRB, and according to the right quantity of complete PRB after total resource quantity calculating conversion, and the TBS that determines downlink data according to the TBS sequence number that the right quantity of the complete PRB after the described conversion of calculating is determined by described MCS sequence number.
Wherein, NodeB 100 comprises selection module 110, scheduling parameter determination module 120, scheduling sending module 130.Select module 110 to be used to UE 200 to select brachymemma PRB and complete PRB transmitting downlink data.Scheduling parameter determination module 120 is used for being defined as the transmission block size TBS of UE 200 transmission and being the right quantity of total PRB of the right quantity sum of the right quantity of the complete PRB that dispatches and brachymemma PRB according to the business of carrying.It is UE 200 scheduled transmission downlink datas that scheduling sending module 130 is used for according to the TBS that determines, and right quantity and the MCS sequence number of total PRB that will adopt sends to UE 200.
Wherein, if it is professional that the business that NodeB 100 carries is VoIP, then scheduling parameter determination module 120 is according to the professional definite TBS of VoIP, and determine the quantity that complete PRB is right according to TBS and the channel quality information determined, and be that UE 200 selects complete PRB and brachymemma PRB transmitting downlink data according to the resource that can dispatch, and calculate the right quantity of brachymemma PRB and total right quantity of PRB, right quantity conversion obtains the quantity that wherein brachymemma PRB is right according to complete PRB.
Wherein, if the business that NodeB 100 carries is data service, then scheduling parameter determination module 120 is determined right quantity and the right quantity of brachymemma PRB of complete PRB of scheduling according to the resource that can dispatch, and calculate the right quantity of complete PRB and the right total right quantity of PRB of quantity sum of brachymemma PRB, and the right quantity of brachymemma PRB converted obtain converting the right quantity of rear complete PRB, tabling look-up according to the right quantity of complete PRB after the right quantity of complete PRB and the conversion obtains TBS.
Wherein, in the above-described embodiments, the conversion relation between the right quantity of the quantity that complete PRB is right and brachymemma PRB is determined according to the size of brachymemma PRB.
Wherein, UE 200 comprises receiver module 210, indication information acquisition module 220, complete PRB Logarithmic calculation module 230 and TBS determination module 240.Receiver module 210 is used for receiving NodeB 100 by the downlink data of brachymemma PRB and complete PRB transmission.Indication information acquisition module 220 is used for obtaining the MCS sequence number of dispatch indication and total right quantity of PRB, and the quantity that wherein total PRB is right is right quantity and the right quantity sum of brachymemma PRB of complete PRB of dispatching.Complete PRB Logarithmic calculation module 230 is used for calculating total resource quantity according to the right quantity of total PRB and the situation of each brachymemma PRB, and calculates the right quantity of complete PRB after the conversion according to total resource quantity.TBS determination module 240 is used for determining according to the TBS sequence number that the right quantity of the complete PRB after the conversion of calculating is determined by described MCS sequence number the TBS of described downlink data.
Wherein, in one embodiment of the invention, complete PRB Logarithmic calculation module 230 is calculated described total resource quantity according to following formula:
Wherein, R
iBe the resource granularity of every kind of PRB, N
iNumber for every kind of PRB; Again according to the right quantity of complete PRB after the following formula calculating conversion:
Or
Wherein, N '
PRBBe the right quantity of complete PRB after the conversion,
Expression rounds operation downwards to x.
Wherein, in another embodiment of the present invention, complete PRB Logarithmic calculation module 230 is calculated described total resource quantity: R according to following formula
Min* N
PRB, wherein, R
MinBe the PRB resource granularity of minimum particle size, N
PRBBe the right quantity of total PRB; Again according to the right quantity of complete PRB after the following formula calculating conversion:
R wherein
MinBe the PRB resource granularity of minimum particle size, N
PRBBe the right quantity of total PRB.
Wherein, in another embodiment of the present invention, complete PRB Logarithmic calculation module 230 is calculated the right quantity of complete PRB after the described conversion: N according to following formula
p+ N '
PRB, N wherein
pBe the right quantity of complete PRB,
R
iBe the resource granularity of brachymemma PRB, N
iNumber for brachymemma PRB.
Can be on the self-adaptive processing process and resource base of utilizing existing common subframe by the present invention, processes all or part of special circumstances during by brachymemma PRB transmitting downlink data, realize simply, efficiently.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment that scope of the present invention is by claims and be equal to and limit.
Claims (22)
1. an adaptive modulation and coding method is characterized in that, may further comprise the steps:
Sending node selects brachymemma Physical Resource Block PRB and complete PRB in order to transmitting downlink data;
Described sending node is defined as the transmission block size TBS of receiving node transmission according to the business of carrying and is the right quantity of total PRB of the right quantity sum of the right quantity of the complete PRB that dispatches and brachymemma PRB;
Described sending node is described receiving node scheduled transmission downlink data according to the TBS that determines, and right quantity, positional information and the MCS sequence number of total PRB that will adopt sends to described receiving node;
Described receiving node calculates total resource quantity according to the situation of described total PRB right quantity, positional information and each brachymemma PRB;
Described receiving node calculates the right quantity of complete PRB after the conversion according to total resource quantity, and according to the right quantity of the complete PRB after the described conversion of calculating and the TBS that determines described downlink data by the TBS sequence number that described MCS sequence number is determined.
2. adaptive modulation and coding method as claimed in claim 1, it is characterized in that, the business that described sending node carries is the business of fixed data bag size, and described sending node is defined as the TBS of described receiving node transmission according to the business of carrying and is that the right quantity of total PRB of the right quantity sum of the right quantity of the complete PRB that dispatches and brachymemma PRB comprises:
Described sending node is determined TBS according to the business of carrying;
Described sending node is determined the right quantity of PRB of concrete this data block of carrying according to the TBS that determines and channel quality information;
Described sending node is that described receiving node is selected complete PRB and brachymemma PRB transmitting downlink data according to the resource that can dispatch, and calculate the right quantity of brachymemma PRB and total right quantity of PRB, right quantity conversion obtains the right quantity of wherein said brachymemma PRB according to complete PRB.
3. adaptive modulation and coding method as claimed in claim 1, it is characterized in that, the business that described sending node carries is the business of on-fixed data package size, and described sending node is defined as the TBS of described receiving node transmission according to the business of carrying and is that the right quantity of total PRB of the right quantity sum of the right quantity of the complete PRB that dispatches and brachymemma PRB comprises:
Described sending node is determined right quantity and the right quantity of brachymemma PRB of complete PRB of scheduling according to the resource that can dispatch;
Described sending node calculates the right quantity of complete PRB and the right total right quantity of PRB of quantity sum of brachymemma PRB;
Described sending node is converted the right quantity of described brachymemma PRB and is obtained converting the right quantity of rear complete PRB;
Described sending node according to the right quantity of described complete PRB and conversion after the right quantity of complete PRB table look-up and obtain TBS, and the packet of scheduling TBS size transmits at the PRB that determines.
4. such as adaptive modulation and coding method as described in claim 2 or 3, it is characterized in that the conversion relation between the right quantity of the quantity that described complete PRB is right and described brachymemma PRB is determined according to the size of brachymemma PRB.
5. adaptive modulation and coding method as claimed in claim 1 is characterized in that, described receiving node calculates total resource quantity according to the situation of the right quantity of described total PRB and each brachymemma PRB and comprises:
Described total resource quantity calculates by following formula:
6. adaptive modulation and coding method as claimed in claim 5 is characterized in that, the right quantity of complete PRB that described receiving node calculates after the conversion according to total resource quantity comprises:
The quantity that complete PRB after the described conversion is right calculates by following formula:
7. adaptive modulation and coding method as claimed in claim 1 is characterized in that, described receiving node calculates total resource quantity according to the situation of the right quantity of described total PRB and each brachymemma PRB and comprises:
Described total resource quantity calculates by following formula:
R
Min* N
PRB, wherein, described R
MinBe the PRB resource granularity of minimum particle size, N
PRBBe the right quantity of total PRB.
8. adaptive modulation and coding method as claimed in claim 7 is characterized in that, the right quantity of complete PRB that described receiving node calculates after the conversion according to total resource quantity comprises:
The quantity that complete PRB after the described conversion is right calculates by following formula:
9. adaptive modulation and coding method as claimed in claim 1 is characterized in that, the right quantity of complete PRB after the described calculating conversion comprises:
The quantity that complete PRB after the conversion is right is N
p+ N '
PRB, N wherein
pBe the right quantity of complete PRB,
Described R
iBe the resource granularity of brachymemma PRB, N
iNumber for brachymemma PRB.
10. such as claim 1,2,3,5,6,7,8,9 adaptive modulation and coding method as described in each, it is characterized in that described sending node is base station node B or evolution base station eNodeB, described receiving node is via node RN or user equipment (UE); Perhaps described sending node is RN, and described receiving node is UE.
11. an adaptive modulation and coding system is characterized in that, comprises at least one receiving node of sending node and described sending node service,
Described sending node, be used for selecting brachymemma PRB and complete PRB in order to transmitting downlink data, and be defined as the transmission block size TBS of described receiving node transmission and be the right quantity of total PRB of the right quantity sum of the right quantity of the complete PRB that dispatches and brachymemma PRB according to the business of carrying, and be described receiving node scheduled transmission downlink data according to the TBS that determines, and right quantity, positional information and the MCS sequence number of total PRB that will adopt sends to described receiving node;
Described receiving node, be used for calculating total resource quantity according to the situation of described total PRB right quantity, positional information and each brachymemma PRB, and calculate the right quantity of complete PRB after the conversion according to total resource quantity, and according to the right quantity of the complete PRB after the described conversion of calculating with determine the TBS of described downlink data by the TBS sequence number that described MCS sequence number is determined.
12. adaptive modulation and coding as claimed in claim 11 system is characterized in that described sending node is NodeB or eNodeB, described receiving node is RN or UE; Perhaps described sending node is RN, and described receiving node is UE.
13. a sending node is characterized in that, comprises selecting module, scheduling parameter determination module, scheduling sending module,
Described selection module is used for selecting brachymemma PRB and complete PRB in order to transmitting downlink data;
Described scheduling parameter determination module is used for being defined as the transmission block size TBS of receiving node transmission and being the right quantity of total PRB of the right quantity sum of the right quantity of the complete PRB that dispatches and brachymemma PRB according to the business of carrying;
Described scheduling sending module, being used for according to the TBS that determines is described receiving node scheduled transmission downlink data, and right quantity, positional information and the MCS sequence number of total PRB that will adopt send to described receiving node,
Wherein, described receiving node calculates total resource quantity according to the situation of described total PRB right quantity, positional information and each brachymemma PRB, and calculate the right quantity of complete PRB after the conversion according to total resource quantity, and according to the right quantity of the complete PRB after the described conversion of calculating with determine the TBS of described downlink data by the TBS sequence number that described MCS sequence number is determined.
14. sending node as claimed in claim 13, it is characterized in that, if the business that described sending node carries is the business of fixed data bag size, then described scheduling parameter determination module is determined TBS according to the business of fixed data bag size, and according to the TBS that determines and the definite concrete right quantity of PRB of carrying this data block of channel quality information, and be that described receiving node is selected complete PRB and brachymemma PRB transmitting downlink data according to the resource that can dispatch, and calculate the right quantity of brachymemma PRB and total right quantity of PRB, right quantity conversion obtains the right quantity of wherein said brachymemma PRB according to complete PRB.
15. sending node as claimed in claim 13, it is characterized in that, if the business that described sending node carries is the business of on-fixed data package size, then described scheduling parameter determination module is determined right quantity and the right quantity of brachymemma PRB of complete PRB of scheduling according to the resource that can dispatch, and calculate the right quantity of complete PRB and the right total right quantity of PRB of quantity sum of brachymemma PRB, and the right quantity of described brachymemma PRB converted obtain converting the right quantity of rear complete PRB, tabling look-up according to the right quantity of complete PRB after the right quantity of described complete PRB and the conversion obtains TBS, and the packet of scheduling TBS size transmits at the PRB that determines.
16., it is characterized in that the conversion relation between the right quantity of the quantity that described complete PRB is right and described brachymemma PRB is determined according to the size of brachymemma PRB such as the described sending node of claims 14 or 15.
17., it is characterized in that described sending node is NodeB, eNodeB or RN such as each described sending node of claim 13 to 15.
18. a receiving node is characterized in that, comprises receiver module, indication information acquisition module, complete PRB Logarithmic calculation module and TBS determination module,
Described receiver module is used for receiving sending node by the downlink data of complete PRB and brachymemma PRB transmission;
Described indication information acquisition module is used for obtaining the MCS sequence number of dispatch indication and total right quantity of PRB, and wherein said total right quantity of PRB is right quantity and the right quantity sum of brachymemma PRB of complete PRB of dispatching;
Described complete PRB Logarithmic calculation module is used for calculating total resource quantity according to the right quantity of described total PRB and the situation of each brachymemma PRB, and calculates the right quantity of complete PRB after the conversion according to total resource quantity;
Described TBS determination module is used for according to the right quantity of the complete PRB after the described conversion of calculating and the TBS that determines described downlink data by the TBS sequence number that described MCS sequence number is determined.
19. receiving node as claimed in claim 18 is characterized in that, the quantity computing module that described complete PRB is right calculates described total resource quantity according to following formula:
Again according to the right quantity of complete PRB after the following formula calculating conversion:
20. receiving node as claimed in claim 18 is characterized in that, the quantity computing module that described complete PRB is right calculates described total resource quantity according to following formula:
R
Min* N
PRB, wherein, described R
MinBe the PRB resource granularity of minimum particle size, N
PRBBe the right quantity of total PRB;
Again according to the right quantity of complete PRB after the following formula calculating conversion:
21. receiving node as claimed in claim 18 is characterized in that, described complete PRB Logarithmic calculation module is calculated the right quantity of complete PRB after the described conversion according to following formula:
N
p+ N '
PRB, N wherein
pBe the right quantity of complete PRB,
Described R
iBe the resource granularity of brachymemma PRB, N
iNumber for brachymemma PRB.
22., it is characterized in that described receiving node is RN or UE such as each described receiving node of claim 18-21.
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|---|---|---|---|
| CN 200910083116 CN101877626B (en) | 2009-04-30 | 2009-04-30 | Adaptive modulation and coding method, system and device |
| PCT/CN2009/073008 WO2010012239A1 (en) | 2008-07-30 | 2009-07-30 | Method, system and device for adaptive modulation and coding |
| US13/056,890 US8441999B2 (en) | 2008-07-30 | 2009-07-30 | Method, system and device for adaptive modulation and coding |
| KR1020117004825A KR101289261B1 (en) | 2008-07-30 | 2009-07-30 | Method, system and device for adaptive modulation and coding |
| MX2011001043A MX2011001043A (en) | 2008-07-30 | 2009-07-30 | Method, system and device for adaptive modulation and coding. |
| JP2011520312A JP5260742B2 (en) | 2008-07-30 | 2009-07-30 | Adaptive modulation and coding method, system and apparatus |
| ES09802432.6T ES2609004T3 (en) | 2008-07-30 | 2009-07-30 | Adaptive modulation and coding procedures and devices |
| EP09802432.6A EP2315369B1 (en) | 2008-07-30 | 2009-07-30 | Methods and devices for adaptive modulation and coding |
| US13/874,070 US9060363B2 (en) | 2008-07-30 | 2013-04-30 | Method, system and device for adaptive modulation and coding |
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| US9407417B2 (en) * | 2013-01-09 | 2016-08-02 | Qualcomm Incorporated | Identifying modulation and coding schemes and channel quality indicators |
| CN104038970B (en) * | 2013-03-05 | 2017-12-19 | 电信科学技术研究院 | A kind of communication processing method and equipment |
| EP3442256A4 (en) * | 2016-04-08 | 2019-11-06 | NTT DoCoMo, Inc. | User terminal and wireless communication method |
| CN113507298A (en) * | 2021-07-09 | 2021-10-15 | 磐基技术有限公司 | Modulation mode self-adaptive adjusting method and system based on channel quality detection |
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