CN106559894B - Decision method and device for uplink MCS level - Google Patents

Decision method and device for uplink MCS level Download PDF

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CN106559894B
CN106559894B CN201510634620.5A CN201510634620A CN106559894B CN 106559894 B CN106559894 B CN 106559894B CN 201510634620 A CN201510634620 A CN 201510634620A CN 106559894 B CN106559894 B CN 106559894B
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mcs level
mcs
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transmission
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CN106559894A (en
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柯颋
陈卓
童辉
刘建军
沈晓冬
侯雪颖
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China Mobile Communications Group Co Ltd
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract

The invention discloses a decision method of uplink Modulation and Coding Strategy (MCS) grade, which comprises the following steps: when User Equipment (UE) determines that an Uplink (UL) transmission opportunity is obtained, determining the UL MCS level used by the UE in UL transmission according to the channel quality measurement result of the UE side or the channel quality measurement result of the UE side and at least one parameter informed by a base station. The invention also discloses equipment for realizing the method.

Description

Decision method and device for uplink MCS level
Technical Field
The present invention relates to uplink scheduling technologies in the field of communications, and in particular, to a method and an apparatus for determining an uplink Modulation and Coding Scheme (MCS) level.
Background
As known in the art, different operators deploy respective Radio Access Technologies (RATs) systems in unlicensed frequency bands, such as: a WIFI system and an unlicensed spectrum LTE system. In order to fairly and orderly use the unlicensed frequency band, the base station and the user equipment of each system need to follow a Listen Before Talk (LBT) scheduling mechanism when transmitting traffic. The Uplink (UL) resource scheduling method adopts a UL long-term scheduling mechanism, that is, the eNB schedules a plurality of UL subframes for the UE at a time, and the UE can compete for channel access opportunities on all or part of the scheduled UL subframes, but in the existing scheduling mechanism, the eNB determines in advance the UL MCS level used by the UE in the subsequent UL transmission, and notifies the UE of the decision through UL DCI signaling, which may cause the problem that the UL MCS level information decided in advance is outdated or invalid due to the change of the channel environment.
There are many possible specific implementations of the UL long-term scheduling mechanism, including but not limited to the following:
scheme 1: one UL scheduling mechanism specified in patent 2015102509434 is that an eNB schedules a UE with multiple UL subframes at a time, the UE sequentially performs LBT operations on all scheduled UL subframes to contend for a channel access opportunity until successfully contending for the channel access opportunity, and uses scheduled UL resources on the UL subframes successfully contending for the channel access opportunity. After the UE successfully contends for the channel access opportunity, the UE does not contend for the channel access opportunity again on the remaining unused UL subframe.
Scheme 2: enhanced Semi-Persistent Scheduling (SPS) mechanism. Namely: the PDCCH scrambled by the eNodeB using the SPS C-RNTI in a certain TTI designates radio resources used by the UE (which will be referred to herein as SPS resources), and the UE uses the SPS resources to transmit or receive data every one cycle. The eNodeB does not need to issue a PDCCH in this subframe (referred to herein as an SPS subframe) to specify the allocated resources. In conventional SPS techniques, a limited configuration is defined for the period size, and the number of repetitions, of the SPS resources. The enhanced SPS technique may define parameters such as a period size and a repetition number of a new SPS resource, for example, a period of the SPS resource is allowed to be 1ms (i.e., 1 subframe length). In contrast to scheme 1, scheme 2 allows the UE to sequentially perform LBT operations on all scheduled UL subframes to contend for a channel access opportunity and use scheduled UL resources on UL subframes that successfully contend for the channel access opportunity. Regardless of whether the UE successfully contends for the channel access opportunity on a specific UL subframe, the UE will contend for the channel access opportunity again on all remaining unused UL subframes.
Disclosure of Invention
In order to solve the existing technical problem, embodiments of the present invention provide a method and an apparatus for determining an uplink MCS level.
The embodiment of the invention provides a decision method for an uplink modulation and coding strategy MCS level, which comprises the following steps:
when the user equipment UE determines that the uplink UL transmission opportunity is obtained, determining the UL MCS level used by the user equipment UE in UL transmission according to the channel quality measurement result of the UE side or the channel quality measurement result of the UE side and at least one parameter informed by the base station.
The embodiment of the invention also provides a decision method for the MCS level of the uplink modulation and coding strategy, which comprises the following steps:
before User Equipment (UE) obtains an Uplink (UL) transmission opportunity, a base station informs the UE of at least one parameter, and the UE determines the UL MCS level used by the UE during UL transmission according to the channel quality measurement result of the UE side and the at least one parameter.
The embodiment of the invention also provides a UE for deciding the MCS level of an uplink, wherein the UE comprises:
a detection module, configured to trigger the determination module when determining that the UE has obtained an uplink UL transmission opportunity;
and the determining module is used for determining the UL MCS level used by the UE during UL transmission according to the channel quality measuring result of the UE side or the channel quality measuring result of the UE side and at least one parameter informed by the base station after being triggered by the detecting module.
The embodiment of the invention also provides a decision base station of the uplink MCS level, which comprises:
a storage module for storing at least one parameter;
a sending module, configured to notify the UE of the at least one parameter before the UE obtains an uplink UL transmission opportunity, so that the UE determines, according to a channel quality measurement result at the UE side and the at least one parameter, an UL MCS level used by the UE during UL transmission.
According to the method and the device for determining the uplink MCS level provided by the embodiment of the invention, when the user equipment UE determines that the uplink UL transmission opportunity is obtained, the UL MCS level used by the user equipment UE in UL transmission is determined according to the channel quality measurement result of the UE side or the channel quality measurement result of the UE side and at least one parameter informed by the base station. The embodiment of the invention can effectively solve the problem that the existing UL MCS level information decision and notification mechanism in a long-acting scheduling mechanism and an LTE system is not suitable, and clears technical obstacles for the popularization and application of the long-acting scheduling mechanism.
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In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having different letter suffixes may represent different examples of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed herein.
Fig. 1 is a first flowchart illustrating a method for determining an uplink MCS level according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for determining an uplink MCS level according to an embodiment of the present invention;
fig. 3 is a third schematic flow chart of a method for determining an uplink MCS level according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for determining an uplink MCS level according to an embodiment of the present invention;
fig. 5 is a fifth flowchart illustrating a method for determining an uplink MCS level according to an embodiment of the present invention;
FIG. 6 is a first schematic structural diagram of a UE for determining an uplink MCS level according to an embodiment of the present invention;
FIG. 7 is a second schematic diagram of a UE structure for determining the uplink MCS level according to an embodiment of the present invention;
fig. 8 is a first schematic structural diagram of a base station for determining an uplink MCS level according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a base station for determining an uplink MCS level according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a base station for determining an uplink MCS level according to an embodiment of the present invention;
fig. 11 is a fourth schematic structural diagram of a base station for determining an uplink MCS level according to an embodiment of the present invention;
fig. 12 is a fifth schematic structural diagram of a base station for determining an uplink MCS level according to an embodiment of the present invention;
fig. 13 is a sixth schematic structural diagram of a base station for determining an uplink MCS level according to an embodiment of the present invention;
fig. 14 is a seventh schematic structural diagram of a base station for determining an uplink MCS level according to an embodiment of the present invention;
fig. 15 is a schematic diagram eight illustrating a structure of a base station for determining an uplink MCS level according to an embodiment of the present invention.
Detailed Description
In the existing LTE technology, the eNB needs to decide in advance for the UE which UL mcs level the UE should use at the subsequent UL transmission, and inform the UE of this decision through UL DCI signaling. Note that the MCS level is related to the short-term channel quality. However, under the UL long-term scheduling mechanism, a long time interval may exist between the time when the UE receives the UL scheduling information (the subframe where the UL DCI is located) and the time when the UE really obtains the transmission opportunity, and at this time, the UL MCS level information indicated in the UL DCI may no longer be suitable for the current channel environment, so that the UL MCS level information decided in advance may be outdated and invalidated due to the change of the channel environment. Based on this, the following scheme of the invention is proposed:
in the embodiment of the invention, when the user equipment UE determines that the uplink UL transmission opportunity is obtained, the UL MCS level used by the user equipment UE in UL transmission is determined according to the channel quality measurement result of the UE side or the channel quality measurement result of the UE side and at least one parameter informed by the base station.
The invention is described in further detail below with reference to the figures and the embodiments.
Fig. 1 is a method for determining an uplink MCS level according to an embodiment of the present invention, as shown in fig. 1, the method includes:
step 101: the method comprises the steps that User Equipment (UE) determines that an Uplink (UL) transmission opportunity is obtained;
step 102: and determining the UL MCS level used by the user equipment during UL transmission according to the channel quality measurement result of the UE side or the channel quality measurement result of the UE side and at least one parameter informed by the base station.
In the embodiment of the present invention, the determining, by the UE, the UL MCS level used by the UE during UL transmission according to the result of measuring the channel quality at the UE side includes:
the UL MCS level is calculated according to the following expression:
UL MCS level ═ f (SINR @ UE, other parameters);
wherein, the SINR @ UE represents a channel quality measurement result at the UE side; the f () is a mapping function; the UL MCS level represents an UL MCS level used by the UE in UL transmission; the other parameters at least comprise: the distribution condition of the UL frequency domain resources distributed by the UE and/or the UL transmission mode adopted by the UE;
wherein the SINR @ UE represents a channel quality measurement result at the UE side; or,
Figure BDA0000814608880000052
wherein, TxPower @ UE represents the transmission power of the UE side, Pathloss @ UE represents the path propagation loss measured by the UE side, and Δ M represents the measurement calibration quantity notified by the eNB.
This embodiment may correspond to the following scenario:
the UE determines the adopted UL MCS grade by itself according to the channel quality measurement result of the UE side;
specifically, it is possible to let: UL MCS level ═ f (SINR @ UE, other parameters), where SINR @ UE represents the actual channel quality measurements on the UE side, such as: SINR at the UE side; f () is some mapping function; the UL MCS level indicates an UL MCS level used at the time of UL transmission selected by the UE; other parameters may include the UL frequency domain resource distribution allocated by the UE, the UL transmission mode adopted by the UE, and the like.
It should be noted that the determination of the optimal UL MCS level should depend on the eNB side data demodulation capability, which in turn may be determined by the eNB side channel quality SINR @ eNB, and therefore the UL MCS should actually be a function of the eNB side channel quality SINR @ eNB, rather than the UE side channel quality SINR @ UE, which two functions may be expressed as follows:
SINR@eNB＝TxPower@UE–Pathloss@eNB–noise@eNB–interference@eNB；
SINR@UE＝Tx Power@eNB–Pathloss@UE–noise@UE–interference@UE。
generally, since the eNB side and the UE side have large differences in signal transmission power and in noise and interference environments, the measured channel quality of the eNB side and the measured channel quality of the UE side will also have large differences, i.e. SINR @ eNB ≠ SINR @ UE.
Therefore, the UL MCS level calculation by the UE side channel quality SINR @ UE alone is inaccurate, with large system level errors. Namely: the scenario corresponds to a scheme with a certain deviation.
In another embodiment of the present invention, the determining the UL MCS level used by itself in UL transmission according to the channel quality measurement result on the UE side and at least one parameter notified by the base station may further include:
and determining the UL MCS level used by the user in UL transmission according to the channel quality measurement result of the UE side and the calibration quantity delta M of the channel measurement of the UE side informed by the base station. For example:
this embodiment may correspond to the following scenario:
DCI signaling or RRC signaling issued by the eNB bears the calibration quantity delta M measured by the UE side channel, so as to assist the UE in selecting the proper UL MCS level;
the eNB jointly determines a calibration amount delta M of the UE side channel measurement according to an actual channel quality measurement result of the eNB side and UE side channel quality measurement information (CSI) fed back by the UE, and informs the UE through DCI signaling or RRC signaling;
the UE determines the adopted UL MCS grade jointly according to the channel quality measurement result of the UE side and the measurement calibration quantity delta M informed by the eNB;
specifically, there are 2 kinds of calibration quantity Δ M decision methods for channel measurement:
the first method,
A UE side UL MCS level decision method comprises the following steps:
Figure BDA0000814608880000061
other parameters) of the system, wherein,
Figure BDA0000814608880000062
represents the estimated eNB-side channel quality of the UE;
an estimation method comprises
Figure BDA0000814608880000063
Where Δ M represents a measurement calibration quantity informed by the eNB;
a method for estimating an eNB side channel measurement calibration quantity delta M comprises the following steps:
Figure BDA0000814608880000064
wherein SINR @ eN represents the actual channel quality measurement result at the eNB side,
Figure BDA0000814608880000065
indicating the channel quality of the UE side derived by the eNB through the UE side channel quality measurement information (CSI) fed back by the UE.
The second method,
A UE side UL MCS level decision method comprises the following steps:
Figure BDA0000814608880000071
other parameters) of the system, wherein,
Figure BDA0000814608880000072
represents the estimated eNB-side channel quality of the UE;
an estimation method comprises
Figure BDA0000814608880000073
Wherein, Tx Power @ UE represents the transmission Power of the UE side, Pathloss @ UE represents the path propagation loss measured by the UE side, and Δ M represents the measurement calibration quantity notified by the eNB.
A method for estimating an eNB side channel measurement calibration quantity delta M comprises the following steps:
Δ M ═ E { SINR @ eNB-Tx Power @ UE + Pathloss @ UE }. The known SINR @ eNB is Tx Power @ UE-Pathloss @ eNB-noise @ eNB-interference @ eNB. By combining the above two formulas, the following can be obtained:
ΔM＝E{Pathloss@UE-Pathloss@eNB-noise@eNB-interference@eNB}；
in particular, for a TDD system, based on the channel reciprocity feature Pathloss @ UE ≈ Pathloss @ eNB, we can obtain:
ΔM＝E{Pathloss@UE-Pathloss@eNB-noise@eNB-interference@eNB}≈E{-noise@eNB-interference@eNB}。
wherein, SINR @ eNB represents SINR on the eNB side, Tx Power @ UE represents transmission Power on the UE side, Pathloss @ UE represents path propagation loss on the UE side, Pathloss @ eNB represents path propagation loss on the eNB side, noise @ eNB represents noise level on the eNB side, and interference @ eNB represents interference level on the eNB side.
As can be seen, the calibration quantity Δ M of the UE side channel measurement is:
and the base station determines the channel quality measurement result according to the channel quality measurement result at the base station side and by combining the UE side channel quality measurement information CSI fed back by the UE.
Wherein the UL MCS level is calculated according to the following expression:
Figure BDA0000814608880000074
wherein, the
Figure BDA0000814608880000075
Represents the estimated eNB-side channel quality of the UE; the other parameters include at least: the distribution condition of the UL frequency domain resources distributed by the UE and/or the UL transmission mode adopted by the UE; the above-mentioned
Figure BDA0000814608880000076
The SINR @ UE represents the channel quality measurement result at the UE side.
In the embodiment of the present invention, the method for calculating Δ M includes:
Figure BDA0000814608880000081
wherein the SINR @ eNB represents a channel quality measurement result on the eNB side,
Figure BDA0000814608880000082
and the channel quality of the UE side obtained by the base station based on the UE side channel quality measurement information CSI fed back by the UE is shown.
In the embodiment of the present invention, the UL MCS level is calculated according to the following expression:
Figure BDA0000814608880000083
wherein, the
Figure BDA0000814608880000084
Represents the estimated eNB-side channel quality of the UE; the other parameters include at least: the distribution condition of the UL frequency domain resources distributed by the UE and/or the UL transmission mode adopted by the UE;
the above-mentioned
Figure BDA0000814608880000085
The Tx Power @ UE represents the transmit Power of the UE side; pathloss @ UE represents the measured path propagation loss at the UE side.
In the embodiment of the present invention, Δ M is calculated based on the following expression:
ΔM＝E{SINR@eNB-Tx Power@UE+Pathloss@UE}；
wherein, the SINR @ eNB is Tx Power @ UE-Pathloss @ eNB-noise @ eNB-interference @ eNB; accordingly, one can obtain:
ΔM＝E{Pathloss@UE-Pathloss@eNB-noise@eNB-interference@eNB}；
the SINR @ eNB represents SINR at the base station side, Pathloss @ eNB represents path propagation loss at the base station side, noise @ eNB represents noise level at the base station side, and interference @ eNB represents interference level at the base station side.
Here, for a time division duplex TDD system, the Pathloss @ UE ≈ Pathloss @ eNB, which, correspondingly,
the delta M is equal to E { Pathloss @ UE-Pathloss @ eNB-noise @ eNB-interference @ eNB } isequal to E { -noise @ eNB-interference @ eNB }.
In another embodiment of the present invention, the determining the UL MCS level used by itself in UL transmission according to the channel quality measurement result on the UE side and at least one parameter notified by the base station may further include:
the UE receives a UL MCS level selectable set UL _ MCS _ List informed by the base station, wherein the UL _ MCS _ List is pre-configured by the base station;
and the UE selects a corresponding UL MCS level from the UL _ MCS _ List according to the channel quality measurement result of the UE side. For example:
this embodiment may correspond to the following scenario:
the UL eNB configures a limited number of UL MCS level selectable sets UL _ MCS _ List for the UE in advance through DCI signaling or RRC signaling. The UE selects the most suitable ULMCS level from the UL _ MCS _ List according to the channel quality measurement result of the UE side;
a UE side UL MCS level decision method comprises the following steps: UE traverses the UL _ MCS _ List set, calculates the block error rate (BLER) according to the channel quality measurement result of the UE side aiming at each candidate UL MCS level, and compares the calculated BLER value with a certain specific BLER threshold value;
then, the UE selects the largest UL MCS level from the candidate UL MCS level set whose calculated BLER value is lower than the specific BLER threshold value as the UL MCS level used in the current UL transmission.
In this embodiment of the present invention, the selecting, by the UE, a corresponding UL MCS level from the UL _ MCS _ List according to a result of measuring channel quality at the UE side includes:
the UE traverses the UL _ MCS _ List, and calculates the block error rate (BLER) according to each candidate UL MCS level and the combination of the channel quality measurement result of the UE side;
and comparing the calculated BLER value with a preset BLER threshold value, determining each UL MCS level corresponding to the BLER value lower than the preset BLER threshold value, and selecting the UL MCS level with the maximum UL MCS level from the UL MCS levels as the UL MCS level used by the UE during UL transmission.
In another embodiment of the present invention, the determining the UL MCS level used by itself in UL transmission according to the channel quality measurement result on the UE side and at least one parameter notified by the base station may further include:
selecting a corresponding UL MCS grade from a UL MCS grade selectable set UL _ MCS _ List informed by a base station according to a channel quality measurement result of the UE side and the calibration quantity delta M of the channel measurement of the UE side informed by the base station;
wherein the UL _ MCS _ List is preconfigured by a base station. For example:
this embodiment may correspond to the following scenario:
the eNB configures a limited number of UL MCS level selectable sets UL _ MCS _ List for the UE in advance through DCI signaling or RRC signaling;
the eNB jointly determines a calibration amount delta M of the UE side channel measurement according to an actual channel quality measurement result of the eNB side and UE side channel quality measurement information (CSI) fed back by the UE, and informs the UE through DCI signaling or RRC signaling;
the UE selects the most appropriate UL MCS level from the UL _ MCS _ List according to the channel quality measurement result of the UE side and the calibration quantity delta M of the channel measurement notified by the eNB. Reference may be made in particular to the description in the scenario above.
In this embodiment, as shown in fig. 2, after the UE determines the UL MCS level used in UL transmission, the method further includes:
step 103: the size of a Transport Block Size (TBS) is determined by a preset rule.
Here, the preset rule is a rule that can be understood by the base station.
For example, the UE determines the size of the transport block TBS according to a preset rule, which may include:
and the UE determines the size of the TBS based on the MCS level and the mapping rule of the TBS in the LTE system.
In one embodiment, as shown in fig. 3, after the UE determines the UL MCS level to use for UL transmission, the method further includes:
step 104: and the UE transmits UL data on the scheduled UL resources in the UL downlink control information DCI based on the UL MCS level determined by the UE.
In one embodiment, as shown in fig. 4, after the UE determines the UL MCS level to use for UL transmission, the method further includes:
step 105: and the UE carries the determined UL MCS level related information in an UL uplink control signaling UCI sent to the base station.
Here, the UE may carry the UL MCS level (absolute value) it employs in UL UCI; alternatively, the UE carries the sequence number (relative value) of the UL MCS level it adopts in UL _ MCS _ List in the UL uci.
In one embodiment, as shown in fig. 5, after the UE determines the UL MCS level to use for UL transmission, the method further includes:
step 106: and the OCC of the UE in the reference signal DMRS for UL demodulation sent to the base station carries the sequence number of the determined UL MCS level in the UL _ MCS _ List.
For example: the UE implicitly bears the sequence number of the UL MCS level adopted by the UE in the UL DMRS in the UL _ MCS _ List;
note that the amount of information that can be implicitly carried in the UL DMRS is very limited, and therefore, the information can only be used to carry the sequence number of the UL MCS level adopted by the UE in the UL _ MCS _ List, that is, only several specific decision mechanisms of the UL MCS described above can be supported.
Specifically, the behavior at the UE side is as follows: the eNB specifies one reference Cyclic shift filtered a0 for the UE in UL DCI. After obtaining the channel access opportunity, the UE selects a best matching UL MCS level from the UL _ MCS _ List, and the sequence number of the selected UL MCS level in the UL _ MCS _ List is set as B. The cyclic shift parameter a1 finally used by the UE is a1 ═ g (a0, B), where g () is some function, e.g., a1 ═ a0+ B. The UE configures an UL DMRS reference sequence in UL transmission data with a cyclic shift parameter a 1.
Accordingly, the eNB side acts as follows: after receiving the UL data transmitted by the UE, the eNB searches for a matching cyclic shift parameter a 1'. The eNB parses, through the reference cyclic shift parameter a0 and the searched cyclic shift parameter a1 ', a sequence number B' of the UL MCS level used by the UE in the UL _ MCS _ List, that is, B 'is g _ inverse (a0, a 1'), where g _ inverse () represents an inverse function of g (). For example, when a1 is g (a0, B) is a0+ B, B ' is g _ inverse (a0, a1 ') is a1 ' -a 0.
It should be noted that the eNB needs to ensure, through proper scheduling, that the range sets of cyclic shift parameters a1 actually adopted by multiple UEs multiplexing the same time-frequency resource do not coincide or collide.
For a better understanding of the above description, an example is given below.
In the 3GPP standard, PUSCH supports maximum 8 UEs multiplexing the same UL resource through Cyclic shift and OCC, and specifically selects which mode, which is determined by the Cyclic shift for DM RS and OCCindex field of 3bit in UL DCI. However, in practical operating environments, only 2 UE multiplexing is typically supported. Therefore, the remaining unused Cyclic shift for DM RS and OCC index types can be borrowed to implicitly carry UL MCS level related information.
For example, the eNB configures only two modes of [0,0,0] (UE 0) and [1,0,0] (UE 1). UE n (n ═ 0,1) implicitly carries MCS index information using [ n,0,0] + m, for example:
for UE1, [0,0,0] → MCS index 0, [0,0,1] → MCS index 1, [0,1,0] → MCSindex2, [0,1,1] → MCS index 3;
for UE2, [1,0,0] → MCS index 0, [1,0,1] → MCS index 1, [1,1,0] → MCSindex2, [1,1,1] → MCS index 3.
The cyclic shift parameter range sets used by UE1 and UE2 do not overlap and collide.
Note that MCS index m refers to a sequence number in the UL MCS restricted set configured by the base station, and thus the mapping relationship of MCS index m to the actual MCS level is UE specific. And the eNB determines the UL MCS level by blind detecting a Cyclic shiftand OCC mode carried in the UL DMRS.
In one embodiment, after the UE determines the UL MCS level to use for UL transmission, the method further comprises:
after the UE competes to an UL transmission opportunity, if the current moment is determined not to reach a subframe boundary, the UE sends a preamble signal to occupy a channel until the next subframe boundary; and the preamble signal carries the UL MCS level determined by the UE.
The embodiment of the invention also provides a method for deciding the MCS level of the uplink, which comprises the following steps:
before User Equipment (UE) obtains an Uplink (UL) transmission opportunity, a base station informs the UE of at least one parameter, and the UE determines the UL MCS level used by the UE during UL transmission according to a channel quality measurement result of a UE side and the at least one parameter.
In an embodiment of the present invention, the at least one parameter is: the calibrated amount Δ M of the UE side channel measurement.
In the embodiment of the present invention, the UL MCS level is calculated according to the following expression:
Figure BDA0000814608880000121
wherein the representation represents the channel quality estimated by the UE on the base station side,
Figure BDA0000814608880000123
or
Figure BDA0000814608880000124
Figure BDA0000814608880000125
The other parameters include at least: the distribution condition of the UL frequency domain resources distributed by the UE and/or the UL transmission mode adopted by the UE;
correspondingly, the method for calculating Δ M is as follows:
if it is not
Figure BDA0000814608880000131
Then, the SINR @ eNB represents a channel quality measurement result at the base station side, and represents the channel quality at the UE side obtained by the base station based on the UE-side channel quality measurement information CSI fed back by the UE; or,
if it is not
Figure BDA0000814608880000134
Then Δ M { -noise @ eNB-interference @ eNB }, where noise @ eNB represents the noise level on the eNB side and interference @ eNB represents the interference level on the eNB side.
Wherein before the base station informs the UE of the at least one parameter, the method further comprises:
and the base station determines the calibration quantity delta M of the UE side channel measurement according to the channel quality measurement result of the base station side and by combining the UE side channel quality measurement information CSI fed back by the UE.
In an embodiment of the present invention, the at least one parameter is: the UL MCS level may be a selectable set UL MCS List.
Wherein before the base station informs the UE of the at least one parameter, the method further comprises:
the base station presets an optional set UL MCS _ List of UL MCS levels, which is used for the UE to select a corresponding UL MCS level from the UL MCS _ List according to a channel quality measurement result of the UE side.
In an embodiment of the present invention, the at least one parameter is: the calibration amount Δ M of the UE side channel measurement and the UL MCS level selectable set UL _ MCS _ List.
Wherein before the base station informs the UE of the at least one parameter, the method further comprises:
a base station presets an UL MCS level optional set UL _ MCS _ List;
and determining the calibration quantity delta M of the UE side channel measurement according to the channel quality measurement result of the base station side and by combining the UE side channel quality measurement information CSI fed back by the UE.
In the embodiment of the present invention, the informing, by the base station, of the at least one parameter to the UE includes:
and the base station informs the UE of the at least one parameter through Downlink Control Information (DCI) signaling or Radio Resource Control (RRC) signaling.
In the embodiment of the present invention, the informing, by the base station, of the at least one parameter to the UE includes:
the base station informs the UE of the at least one parameter carried in long-acting scheduling signaling.
In the embodiment of the present invention, the informing, by the base station, of the at least one parameter to the UE includes:
and in a time period from a subframe of the long-acting scheduling signaling sent by the base station to a subframe of the channel access opportunity contended by the UE, the base station sends DCI signaling or RRC signaling for multiple times so as to inform the UE of the updated at least one parameter in time.
In summary, in practical applications, the eNB needs to send some necessary information, such as: the UE is informed of the calibrated amount Δ M of the channel measurement and/or the UL MCS level selectable set UL _ MCS _ List. For the calibrated quantity Δ M of the channel measurement, the eNB informs the UE of the calibrated quantity Δ M of the channel measurement through DCI signaling or RRC signaling.
In particular, the eNB may carry the calibration amount Δ M information of channel measurement in long-term scheduling signaling (one specific DCI signaling).
On a frequent basis, the eNB may transmit DCI signaling or RRC signaling multiple times during a processing period from a subframe where the long-term scheduling signaling is transmitted to a subframe where the UE contends for a channel access opportunity to inform the UE of the updated calibration amount Δ M of the channel measurement in time.
Similarly, for the UL MCS level selectable set UL _ MCS _ List, the eNB informs the UE of the UL MCS level selectable set UL _ MCS _ List through DCI signaling or RRC signaling.
In particular, the eNB may carry UL MCS level selectable set UL _ MCS _ List information in the long acting scheduling signaling.
On a frequency, the eNB may transmit DCI signaling or RRC signaling for multiple times during a processing period from a subframe in which the long-term scheduling signaling is transmitted to a subframe in which the UE contends for a channel access opportunity to inform the UE of the updated UL MCS level selectable set UL _ MCS _ List information in time.
In this embodiment, after the UE determines the UL MCS level itself uses in UL transmission, the method further includes:
and the base station detects the UL MCS level determined by the UE through a preset detection means.
Wherein the base station detects the UL MCS level determined by the UE, and the method comprises the following steps:
the base station traverses all available UL MCS candidate sets of the UE, and determines a corresponding available UL TBS aiming at a specific UL MCS level;
the base station carries out channel decoding on UL received data aiming at the determined ULTBS, if the information obtained by decoding can pass CRC check, the traversal process is ended, and the correct UL MCS level is determined to be searched successfully; otherwise, determining that the reception of the UL data fails only when all UL MCS candidate sets are traversed and the decoding result fails to pass the CRC check.
For example: the eNB blindly detects the UL MCS level adopted by the UE through a blind detection means;
specifically, the eNB traverses all possible UL MCS candidate sets, and determines, for a specific UL MCS level, UL TBS that the eNB may adopt; and the eNB performs channel decoding on the UL received data aiming at the determined UL TBS. If the decoded information can pass the CRC check, ending the traversal process and determining that the correct UL MCS level is successfully searched; in an abnormal situation, it can be determined that the UL data reception fails only when all possible UL MCS candidate sets are traversed and the demodulated result fails to pass the CRC check.
In this embodiment of the present invention, the UL MCS candidate set includes:
all UL MCS levels, or a subset of all UL MCS levels; or,
the UL MCS level selectable set UL _ MCS _ List pre-configured for the UE for the base station through DCI signaling or RRC signaling, or a subset of the UL _ MCS _ List.
In one embodiment, after the UE determines the UL MCS level itself to use for UL transmission, the method further comprises:
and the base station receives the UL DMRS sent by the UE, wherein the OCC in the DMRS bears the sequence number of the UL MCS level determined by the UE in the UL _ MCS _ List.
In this embodiment of the present invention, the receiving, by the base station, the UL DMRS sent by the UE includes:
after receiving UL transmission data sent by UE, the base station searches a matched cyclic shift parameter A1';
through the reference cyclic shift parameter a0 and a1 ', sequence numbers B ' and B ' of UL MCS levels used by the UE in UL _ MCS _ List are analyzed, wherein g _ inverse () represents an inverse function of g (), and g () is a preset function.
In one embodiment, the method further comprises:
the base station schedules the cyclic shift parameter A1 actually adopted by a plurality of UEs multiplexing the same time-frequency resource so as to ensure that the cyclic shift parameter A1 actually adopted by the plurality of UEs does not coincide or conflict.
In one embodiment, after the UE determines the UL MCS level to use for UL transmission, the method further comprises:
and the base station receives an UL uplink control signaling UCI sent by the UE, and the UL UCI carries the determined UL MCS level related information.
In one embodiment, after the UE determines the UL MCS level to use for UL transmission, the method further comprises:
and the base station receives a preamble signal sent by the UE, wherein the preamble signal carries the UL MCS level determined by the UE.
For example: the eNB demodulates UL MCS level information adopted by the UE in the subsequent UL subframe in the UL preamble signal sent by the UE.
The specific information carrying information may be various, for example: in the form of a signature scrambling code is carried in some existing or newly designed UL reference signal.
Therefore, the embodiment of the invention can effectively solve the problem that the existing UL MCS level information decision and notification mechanism in a long-acting scheduling mechanism and an LTE system is not suitable, and clears technical obstacles for the popularization and application of the long-acting scheduling mechanism.
An embodiment of the present invention further provides a UE for determining an uplink MCS level, as shown in fig. 6, where the UE60 includes:
a detection module 601, configured to trigger the determination module when determining that the UE has obtained an uplink UL transmission opportunity;
a determining module 602, configured to determine, after being triggered by the detecting module, an UL MCS level used by the UE during UL transmission according to a channel quality measurement result of the UE side, or according to the channel quality measurement result of the UE side and at least one parameter notified by the base station.
In this embodiment of the present invention, the determining module 602 determines the UL MCS level used by itself in UL transmission according to the result of measuring the channel quality at the UE side, including:
the UL MCS level is calculated according to the following expression:
UL MCS level ═ f (SINR @ UE, other parameters);
wherein, the SINR @ UE represents a channel quality measurement result at the UE side; the f () is a mapping function; the UL MCS level represents an UL MCS level used by the UE in UL transmission; the other parameters at least comprise: the distribution condition of the UL frequency domain resources allocated by the UE and/or the UL transmission mode adopted by the UE.
In this embodiment of the present invention, the determining module 602 determines the UL MCS level used by the UE during UL transmission according to the channel quality measurement result at the UE side and at least one parameter notified by the base station, including:
and determining the UL MCS level used by the user in UL transmission according to the channel quality measurement result of the UE side and the calibration quantity delta M of the channel measurement of the UE side informed by the base station.
Wherein, the calibration quantity Δ M of the UE side channel measurement is:
and the base station determines the channel quality measurement result according to the channel quality measurement result at the base station side and by combining the UE side channel quality measurement information CSI fed back by the UE.
Wherein the UL MCS level is calculated according to the following expression:
Figure BDA0000814608880000171
wherein, the
Figure BDA0000814608880000172
Represents the estimated eNB-side channel quality of the UE; the other parameters include at least: the distribution condition of the UL frequency domain resources distributed by the UE and/or the UL transmission mode adopted by the UE; the above-mentioned
Figure BDA0000814608880000173
The SINR @ UE represents the channel quality measurement result at the UE side.
In the embodiment of the present invention, the method for calculating Δ M includes:
Figure BDA0000814608880000174
wherein the SINR @ eNB represents a channel quality measurement result on the eNB side,
Figure BDA0000814608880000175
and the channel quality of the UE side obtained by the base station based on the UE side channel quality measurement information CSI fed back by the UE is shown.
In the embodiment of the present invention, the UL MCS level is calculated according to the following expression:
Figure BDA0000814608880000176
wherein, the
Figure BDA0000814608880000177
Represents the estimated eNB-side channel quality of the UE; the other parameters include at least: the distribution condition of the UL frequency domain resources distributed by the UE and/or the UL transmission mode adopted by the UE;
the above-mentioned
Figure BDA0000814608880000181
The Tx Power @ UE represents the transmit Power of the UE side; pathloss @ UE represents the measured path propagation loss at the UE side.
In the embodiment of the present invention, Δ M is calculated based on the following expression:
ΔM＝E{SINR@eNB-Tx Power@UE+Pathloss@UE}；
wherein, the SINR @ eNB is Tx Power @ UE-Pathloss @ eNB-noise @ eNB-interference @ eNB; accordingly, one can obtain:
ΔM＝E{Pathloss@UE-Pathloss@eNB-noise@eNB-interference@eNB}；
the SINR @ eNB represents SINR at the base station side, Pathloss @ eNB represents path propagation loss at the base station side, noise @ eNB represents noise level at the base station side, and interference @ eNB represents interference level at the base station side.
Here, for a time division duplex TDD system, the Pathloss @ UE ≈ Pathloss @ eNB, which, correspondingly,
the delta M is equal to E { Pathloss @ UE-Pathloss @ eNB-noise @ eNB-interference @ eNB } isequal to E { -noise @ eNB-interference @ eNB }.
In this embodiment of the present invention, the determining module 602 determines the UL MCS level used by the UE during UL transmission according to the channel quality measurement result at the UE side and at least one parameter notified by the base station, including:
the UE receives a UL MCS level selectable set UL _ MCS _ List informed by the base station, wherein the UL _ MCS _ List is pre-configured by the base station;
and the UE selects a corresponding UL MCS level from the UL _ MCS _ List according to the channel quality measurement result of the UE side.
In this embodiment of the present invention, the selecting, by the UE, a corresponding UL MCS level from the UL _ MCS _ List according to a result of measuring channel quality at the UE side includes:
the UE traverses the UL _ MCS _ List, and calculates the block error rate (BLER) according to each candidate UL MCS level and the combination of the channel quality measurement result of the UE side;
and comparing the calculated BLER value with a preset BLER threshold value, determining each UL MCS level corresponding to the BLER value lower than the preset BLER threshold value, and selecting the UL MCS level with the maximum UL MCS level from the UL MCS levels as the UL MCS level used by the UE during UL transmission.
In this embodiment of the present invention, the determining module 602 determines the UL MCS level used by the UE during UL transmission according to the channel quality measurement result at the UE side and at least one parameter notified by the base station, including:
selecting a corresponding UL MCS grade from a UL MCS grade selectable set UL _ MCS _ List informed by a base station according to a channel quality measurement result of the UE side and the calibration quantity delta M of the channel measurement of the UE side informed by the base station;
wherein the UL _ MCS _ List is preconfigured by a base station.
In one embodiment, after the determining module 602 determines the UL MCS level used by the UE in UL transmission,
and also for determining the size of the transport block TBS by a preset rule.
Here, the preset rule is a rule that can be understood by the base station.
The determining module 602 determines the size of the transport block TBS according to a preset rule, including:
the determining module 602 determines the size of the TBS based on the MCS level and the mapping rule of the TBS in the LTE system.
In one embodiment, as shown in fig. 7, the UE60 further includes: a sending module 603; after the determining module 602 determines the UL MCS level used by the UE in UL transmission,
the sending module 603 is configured to send UL data on the UL resource scheduled in the UL downlink control information DCI based on the UL MCS level determined by the determining module and used by the UE during UL transmission.
In one embodiment, after the determining module determines the UL MCS level used by the UE in UL transmission,
the sending module 603 is further configured to send an UL uplink control signaling UCI to the base station, where the UL UCI carries information related to the UL MCS level determined by the UE.
Here, the UE may carry the UL MCS level it employs in UL UCI; or, the UE carries the sequence number of the UL MCS level in UL _ MCS _ List in the UL UCI.
In one embodiment, after the determining module determines the UL MCS level used by the UE in UL transmission,
the sending module 603 is further configured to send a reference signal DMRS for UL demodulation to the base station, where an OCC in the UL DMRS carries sequence numbers of the determined UL MCS levels in an UL MCS level selectable set UL _ MCS _ List notified by the base station.
In this embodiment of the present invention, the loading, by the OCC in the DMRS for UL demodulation reference signal sent to the base station, the determined UL MCS level related information includes:
selecting a best matching UL MCS level from the UL _ MCS _ List, and setting the sequence number of the selected UL MCS level in the UL _ MCS _ List as B;
the finally used cyclic shift parameter a1 is a1 ═ g (a0, B), where g () is a preset function, such as: a1 ═ a0+ B; the A0 is a reference cyclic shift parameter specified by the base station for the UE in the UL DCI;
the UL DMRS reference sequence in UL transmission data is configured with a cyclic shift parameter a 1.
In one embodiment, after the determining module 602 determines the UL MCS level used by the UE in UL transmission,
the sending module 603 is further configured to send a preamble signal to occupy a channel until a next subframe boundary when it is determined that the current time does not reach the subframe boundary after the UE contends for the UL transmission opportunity; and the preamble signal carries the UL MCS level determined by the UE.
An embodiment of the present invention further provides a base station for determining an uplink MCS level, as shown in fig. 8, where the base station 80 includes:
a storage module 801 for storing at least one parameter;
a sending module 802, configured to notify the UE of the at least one parameter before the UE obtains an uplink UL transmission opportunity, where the sending module is configured to determine, by the UE, an UL MCS level used by the UE during UL transmission according to a channel quality measurement result at the UE side and the at least one parameter.
In one embodiment, as shown in fig. 9, the base station 80 further includes: a first calculation module 803;
the at least one parameter is: when the calibration amount Δ M of the UE side channel measurement is smaller, the first calculation module 803 is configured to determine the calibration amount Δ M of the UE side channel measurement according to the channel quality measurement result of the base station side and by combining the UE side channel quality measurement information CSI fed back by the UE.
In one embodiment, as shown in fig. 10, the base station 80 further includes: a second calculation module 804; the at least one parameter is: the UL MCS level may select the set UL MCS List,
the second calculating module 804 is configured to preset an UL MCS level selectable set UL _ MCS _ List, and is configured to select, by the UE, a corresponding UL MCS level from the UL _ MCS _ List according to a channel quality measurement result on the UE side.
In one embodiment, as shown in fig. 11, the base station 80 further includes: a third calculation module 805; the at least one parameter is: when the calibration amount Δ M of the UE side channel measurement and the UL MCS level selectable set UL _ MCS _ List,
the third calculating module 805 is configured to preset an UL MCS level selectable set UL _ MCS _ List; and determining the calibration quantity delta M of the UE side channel measurement according to the channel quality measurement result of the base station side and by combining the UE side channel quality measurement information CSI fed back by the UE.
In one embodiment, as shown in fig. 12, the base station 80 further includes: a detecting module 806, configured to detect, by a preset detecting means, the UL MCS level determined by the UE.
Here, the detected UL MCS level may be saved in the storage module 801.
In one embodiment, as shown in fig. 13, the base station 80 further includes: a first receiving module 807, configured to receive, after the UE determines the UL MCS level used by itself in UL transmission, an UL DMRS sent by the UE, where an OCC in the DMRS carries a sequence number of the determined UL MCS level of the UE in the UL _ MCS _ List.
In one embodiment, as shown in fig. 14, the base station further includes: a second receiving module 808, configured to receive, by the UE, an UL uplink control signaling UCI sent by the UE after determining an UL MCS level used in UL transmission, where the UL UCI carries the determined UL MCS level related information.
In one embodiment, as shown in fig. 15, the base station further includes: a third receiving module 809, configured to receive a preamble signal sent by the UE after the UE determines the UL MCS level used in UL transmission, where the preamble signal carries the UL MCS level determined by the UE.
Therefore, the embodiment of the invention can effectively solve the problem that the existing UL MCS level information decision and notification mechanism in a long-acting scheduling mechanism and an LTE system is not suitable, and clears technical obstacles for the popularization and application of the long-acting scheduling mechanism.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (29)

1. A method for deciding MCS level of uplink modulation and coding strategy, the method comprising:
when User Equipment (UE) determines that an Uplink (UL) transmission opportunity is obtained, determining the UL MCS level used by the UE in UL transmission according to a channel quality measurement result of the UE side and at least one parameter informed by a base station;
wherein, the determining the UL MCS level used by itself in UL transmission according to the channel quality measurement result of the UE side and at least one parameter notified by the base station includes:
determining the UL MCS grade used by the user in UL transmission according to the channel quality measurement result of the UE side and the calibration quantity delta M of the channel measurement of the UE side informed by the base station;
or,
determining the UL MCS level used by the user when UL transmission according to the channel quality measurement result of the UE side and the calibration quantity delta M and the UL MCS level selectable set UL _ MCS _ List which are informed by the base station and measured by the channel of the UE side;
or,
the UE receives a UL MCS level selectable set UL _ MCS _ List informed by the base station, wherein the UL _ MCS _ List is pre-configured by the base station; the UE traverses the UL _ MCS _ List, and calculates the block error rate (BLER) according to each candidate UL MCS level and the combination of the channel quality measurement result of the UE side; comparing the calculated BLER value with a preset BLER threshold value, determining each UL MCS level corresponding to the BLER value lower than the preset BLER threshold value, and selecting the UL MCS level with the maximum UL MCS level from the UL MCS levels as the UL MCS level used by the UE during UL transmission;
the calibration quantity Δ M is: and the base station determines the channel quality measurement result according to the channel quality measurement result at the base station side and by combining the UE side channel quality measurement information CSI fed back by the UE.
2. The method of claim 1, wherein the expression for determining the UL MCS level used by itself in UL transmission according to the UE-side channel quality measurement result and the calibration Δ M of the UE-side channel measurement reported by the base station is as follows:
Figure FDA0002404314840000021
wherein, the
Figure FDA0002404314840000022
Representing the channel quality estimated by the UE on the base station side; the other parameters include at least: distribution situation of UL frequency domain resources allocated by UE and/or UL transmission mode adopted by UE；
Wherein, the
Figure FDA0002404314840000023
The SINR @ UE represents a channel quality measurement result of the UE side; or, SINR @ eNB is Tx Power @ UE-path @ UE + Δ M, where Tx Power @ UE represents the transmission Power of the UE side, path @ UE represents the path propagation loss measured by the UE side, Δ M represents the measurement calibration quantity notified by the eNB, and f () is the mapping function.
3. The method of claim 1, wherein the determining the UL MCS level used for UL transmission by itself according to the UE-side channel quality measurement result and combining the calibration amount Δ M of the UE-side channel measurement reported by the base station and the UL MCS level selectable set UL _ MCS _ List comprises:
selecting a corresponding UL MCS grade from a UL MCS grade selectable set UL _ MCS _ List informed by a base station according to a channel quality measurement result of the UE side and the calibration quantity delta M of the channel measurement of the UE side informed by the base station;
wherein the UL _ MCS _ List is preconfigured by a base station.
4. The method of claim 1, wherein after the UE determines the UL MCS level to use for UL transmission, the method further comprises:
the size of the transport block TBS is determined by a preset rule.
5. The method of claim 1, wherein after the UE determines the UL MCS level to use for UL transmission, the method further comprises:
and the UE carries the determined UL MCS level related information in the UCI (uplink control information) sent to the base station.
6. The method of claim 1 or 3, wherein after the UE determines the UL MCS level to be used for UL transmission, the method further comprises:
and the OCC of the UE in the reference signal DMRS for UL demodulation sent to the base station carries the sequence number of the determined UL MCS level in the UL _ MCS _ List.
7. The method of claim 1, wherein after the UE determines the UL MCS level to use for UL transmission, the method further comprises:
after the UE competes to an UL transmission opportunity, if the current moment is determined not to reach a subframe boundary, the UE sends a preamble signal to occupy a channel until the next subframe boundary; and the preamble signal carries the UL MCS level determined by the UE.
8. A method for deciding MCS level of uplink modulation and coding strategy, the method comprising:
before User Equipment (UE) obtains an Uplink (UL) transmission opportunity, a base station informs the UE of at least one parameter, and the base station is used for determining the UL MCS level used by the UE in UL transmission according to a channel quality measurement result of a UE side and the at least one parameter;
wherein the at least one parameter is:
a calibration quantity delta M of UE side channel measurement;
or, the calibration quantity Δ M measured by the UE side channel and the UL MCS level selectable set UL _ MCS _ List;
the calibration quantity Δ M is: and the base station determines the channel quality measurement result according to the channel quality measurement result at the base station side and by combining the UE side channel quality measurement information CSI fed back by the UE.
9. The method of claim 8, wherein the UL MCS level is calculated according to the following expression:
Figure FDA0002404314840000031
wherein, the
Figure FDA0002404314840000032
Base station representing UE estimationThe channel quality of the side(s),
Figure FDA0002404314840000033
or
Figure FDA0002404314840000034
Figure FDA0002404314840000035
The other parameters include at least: the distribution condition of the UL frequency domain resources distributed by the UE and/or the UL transmission mode adopted by the UE;
correspondingly, the method for calculating Δ M is as follows:
if it is not
Figure FDA0002404314840000036
Then
Figure FDA0002404314840000037
Wherein the SINR @ eNB represents a channel quality measurement result on a base station side,
Figure FDA0002404314840000038
representing the UE side channel quality obtained by the base station based on UE side channel quality measurement information CSI fed back by the UE; or,
if it is not
Figure FDA0002404314840000041
Then Δ M { -noise @ eNB-interference @ eNB }, where noise @ eNB represents the noise level on the eNB side, interference @ eNB represents the interference level on the eNB side, Tx Power @ UE represents the transmit Power on the UE side, Pathloss @ UE represents the measured path propagation loss on the UE side, f () is the mapping function, E { } is the expectation function.
10. The method of claim 8, wherein before the base station informs the UE of the at least one parameter, the method further comprises:
a base station presets an UL MCS level optional set UL _ MCS _ List;
and determining the calibration quantity delta M of the UE side channel measurement according to the channel quality measurement result of the base station side and by combining the UE side channel quality measurement information CSI fed back by the UE.
11. The method of claim 8, wherein the base station informs the UE of the at least one parameter, comprising:
and the base station informs the UE of the at least one parameter through Downlink Control Information (DCI) signaling or Radio Resource Control (RRC) signaling.
12. The method of claim 8, wherein the base station informs the UE of the at least one parameter, comprising:
the base station informs the UE of the at least one parameter carried in long-acting scheduling signaling.
13. The method of claim 8, wherein the base station informs the UE of the at least one parameter, comprising:
and in a time period from a subframe of the long-acting scheduling signaling sent by the base station to a subframe of the channel access opportunity contended by the UE, the base station sends DCI signaling or RRC signaling for multiple times so as to inform the UE of the updated at least one parameter in time.
14. The method of claim 8, wherein after the UE determines the UL mcs level to be used by itself for UL transmission, the method further comprises:
and the base station detects the UL MCS level determined by the UE through a preset detection means.
15. The method of claim 14, wherein the UL MCS candidate set comprises:
all UL MCS levels, or a subset of all UL MCS levels; or,
the UL MCS level selectable set UL _ MCS _ List pre-configured for the UE for the base station through DCI signaling or RRC signaling, or a subset of the UL _ MCS _ List.
16. The method of claim 8, wherein after the UE determines the UL mcs level to be used by itself for UL transmission, the method further comprises:
and the base station receives the UL DMRS sent by the UE, wherein the OCC in the DMRS bears the sequence number of the UL MCS level determined by the UE in the UL _ MCS _ List.
17. The method of claim 8, wherein after the UE determines the UL MCS level to use for UL transmission, the method further comprises:
the base station receives a UL uplink control signaling UCI sent by UE, and the UL UCI carries the determined UL MCS level related information.
18. The method of claim 8, wherein after the UE determines the UL MCS level to use for UL transmission, the method further comprises:
and the base station receives a preamble signal sent by the UE, wherein the preamble signal carries the UL MCS level determined by the UE.
19. An uplink MCS level decision UE, comprising:
a detection module, configured to trigger the determination module when determining that the UE has obtained an uplink UL transmission opportunity;
a determining module, configured to determine, after being triggered by the detecting module, an UL MCS level used by the UE during UL transmission according to a channel quality measurement result at the UE side and at least one parameter notified by the base station;
determination module, in particular for
Determining the UL MCS grade used by the user in UL transmission according to the channel quality measurement result of the UE side and the calibration quantity delta M of the channel measurement of the UE side informed by the base station;
or, according to the channel quality measurement result of the UE side, and combining the calibration quantity Δ M of the UE side channel measurement and the UL MCS level optional set UL _ MCS _ List notified by the base station, determining the UL MCS level used by the user when UL transmission is performed;
or, the UE receives a UL MCS level selectable set UL _ MCS _ List notified by the base station, wherein the UL _ MCS _ List is pre-configured by the base station; the UE traverses the UL _ MCS _ List, and calculates the block error rate (BLER) according to each candidate UL MCS level and the combination of the channel quality measurement result of the UE side; comparing the calculated BLER value with a preset BLER threshold value, determining each UL MCS level corresponding to the BLER value lower than the preset BLER threshold value, and selecting the UL MCS level with the maximum UL MCS level from the UL MCS levels as the UL MCS level used by the UE during UL transmission;
wherein the calibration quantity Δ M is: and the base station determines the channel quality measurement result according to the channel quality measurement result at the base station side and by combining the UE side channel quality measurement information CSI fed back by the UE.
20. The UE of claim 19, wherein the determining module, after determining a UL MCS level for use by the UE in UL transmissions,
and also for determining the size of the transport block TBS by a preset rule.
21. The UE of claim 19, wherein the UE further comprises: a sending module; after the determining module determines the UL MCS level used by the UE in UL transmission,
and the sending module is configured to send UL data on the UL resource scheduled in the UL downlink control information DCI based on the UL MCS level determined by the determining module and used by the UE during UL transmission.
22. The UE of claim 21, wherein the determining module determines a UL MCS level for use by the UE in UL transmissions,
the sending module is further configured to send an UL uplink control signaling UCI to the base station, where the UL UCI carries information related to the UL MCS level determined by the UE.
23. The UE of claim 21, wherein the determining module determines a UL MCS level for use by the UE in UL transmissions,
the sending module is further configured to send a reference signal DMRS for UL demodulation to the base station, where an OCC in the UL DMRS carries sequence numbers of the determined UL MCS levels in an UL MCS level selectable set UL _ MCS _ List notified by the base station.
24. The UE of claim 21, wherein the determining module determines a UL MCS level for use by the UE in UL transmissions,
the sending module is further configured to send a preamble signal to occupy a channel until a next subframe boundary when it is determined that the current time does not reach the subframe boundary after the UE contends for the UL transmission opportunity; and the preamble signal carries the UL MCS level determined by the UE.
25. A base station for uplink MCS level decision, the base station comprising:
a storage module for storing at least one parameter;
a sending module, configured to notify the UE of the at least one parameter before the UE obtains an uplink UL transmission opportunity, and determine, by the UE, an UL MCS level used by the UE during UL transmission according to a channel quality measurement result at the UE side and the at least one parameter;
wherein the at least one parameter is:
a calibration quantity delta M of UE side channel measurement;
or, the calibration quantity Δ M measured by the UE side channel and the UL MCS level selectable set UL _ MCS _ List;
the calibration quantity Δ M is: and the base station determines the channel quality measurement result according to the channel quality measurement result at the base station side and by combining the UE side channel quality measurement information CSI fed back by the UE.
26. The base station of claim 25, wherein the base station further comprises: and the detection module is used for detecting the UL MCS level determined by the UE through a preset detection means.
27. The base station of claim 25, wherein the base station further comprises: a first receiving module, configured to receive, after a UE determines an UL MCS level used by the UE itself in UL transmission, an UL DMRS sent by the UE, where an OCC in the DMRS carries a sequence number of the determined UL MCS level of the UE in the UL _ MCS _ List.
28. The base station of claim 25, wherein the base station further comprises: a second receiving module, configured to receive, by the UE, an UL uplink control signaling UCI sent by the UE after determining an UL MCS level used in UL transmission, where the UL UCI carries information related to the determined UL MCS level.
29. The base station of claim 25, wherein the base station further comprises: a third receiving module, configured to receive a preamble signal sent by the UE after the UE determines the UL MCS level used in UL transmission, where the preamble signal carries the UL MCS level determined by the UE.
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