WO2019061365A1

WO2019061365A1 - Methods， devices and computer readable mediums for a modulation of downlink transmission

Info

Publication number: WO2019061365A1
Application number: PCT/CN2017/104651
Authority: WO
Inventors: Chunhai Yao; Rapeepat Ratasuk
Original assignee: Nokia Shanghai Bell Co., Ltd.; Nokia Solutions And Networks Oy; Nokia Technologies Oy
Priority date: 2017-09-29
Filing date: 2017-09-29
Publication date: 2019-04-04
Also published as: CN111164902A; CN111164902B

Abstract

Embodiments of the disclosure provide a method and device for a modulation of downlink transmission. According to the embodiments of the present disclosure, the terminal device may determine the modulation scheme related to the physical layer based on higher layer signaling and physical layer signaling. According to the embodiments of the present disclosure, the network device may configure the modulation scheme to the terminal device in a flexible way.

Description

METHODS， DEVICES AND COMPUTER READABLE MEDIUMS FOR A MODULATION OF DOWNLINK TRANSMISSION

FIELD

Embodiments of the present disclosure generally relate to communication techniques， and more particularly， to methods， devices and computer readable mediums for a modulation of downlink transmission.

BACKGROUND

In recent years， technologies of machine type of communication have been further developed. In 3rd Generation Partnership Project (3GPP) Radio Access Network (RAN) #75 meeting， a new work item “Even Further Enhanced eMTC for LTE” has been approved for improving spectral efficiencies of Physical Downlink Shared Channel (PDSCH) . One possible method is to specify optional support for 64 Quadrature Amplitude Modulation (QAM) for unicast PDSCH.

SUMMARY

Generally， embodiments of the present disclosure relate to a method for a modulation of downlink transmission and the corresponding network device and terminal device.

In a first aspect， embodiments of the present disclosure provide a method implemented at a terminal device for communication. The method comprises： obtaining， from a network device and via a first signaling of a higher layer， first configuration information related to a modulation of a physical channel； obtaining， from the network device and via a second signaling of a physical layer， second configuration information related to the modulation； and determining， based on the first configuration information and the second configuration information， a modulation scheme related to the physical channel.

In some embodiments， the method comprises： in response to the first configuration information indicating that the number of subframe of Channel State Information (CSI) reference resource is a predetermined number， determining the modulation scheme to be a modulation scheme with an order exceeding a predetermined value.

In some embodiments， the method comprises： determining the modulation scheme to be a modulation scheme with an order exceeding a predetermined value in response to， the first configuration information indicating that the number of subframe of Channel State Information (CSI) reference resource exceeds a predetermined number， and the second configuration information indicating that the transmission of the physical channel is free of repetition.

In some embodiments， the method comprises： determining the modulation scheme to be a modulation scheme with an order being or being below a predetermined value in response to， in the first configuration information indicating that the number of subframe of Channel State Information (CSI) reference resource exceeds a predetermined number， and the second configuration information indicating the transmission of the physical channel with repetition.

In some embodiments， the method comprises： obtaining the first configuration information via a radio resource control (RRC) signaling. In some embodiments， the physical channel is a Physical Downlink Shared Channel (PDSCH) .

In a second aspect， embodiments of the present disclosure provide a method implemented at a network device for communication. The method comprises： determining first configuration information related to a modulation of a physical channel based on a channel condition between the network device and a terminal device； determining second configuration information related to the modulation based on at least one of the channel condition and a response from the terminal device； sending， to the terminal device and via a first signaling of a higher layer， the first configuration information； and sending， to the terminal device and via a second signaling of a physical layer， the second configuration information.

In some embodiments， the method comprises： in response to quality of the channel exceeding a predetermined threshold and changes of the channel condition being below a predetermined threshold during given time， determining the first configuration information to indicate that the number of subframe of Channel State Information (CSI) reference resource is a predetermined number.

In some embodiments， the method comprise： in response to the number negative acknowledgement (NACK) receiving from the terminal device exceeding a predetermined threshold， determining the second configuration information to indicate the transmission of the physical channel with repetition.

In some embodiments， the method comprises： sending the first configuration information to the terminal device via a radio resource control (RRC) signaling. In some embodiments， the physical channel is a Physical Downlink Shared Channel (PDSCH) .

In a third aspect， embodiments of the disclosure provide a terminal device. The terminal device comprises： at least on processor； and a memory coupled to the at least one processor， the memory storing instructions therein， the instructions， when executed by the at least one processor， causing the terminal device to perform acts including： obtaining， from a network device and via a first signaling of a higher layer， first configuration information related to a modulation of a physical channel； obtaining， from the network device and via a second signaling of a physical layer， second configuration information related to the modulation； and determining， based on the first configuration information and the second configuration information， a modulation scheme related to the physical channel.

In a fourth aspect， embodiments of the disclosure provide a network device. The network device comprises： at least on processor； and a memory coupled to the at least one processor， the memory storing instructions therein， the instructions， when executed by the at least one processor， causing the network device to perform acts including： determining first configuration information related to a modulation of a physical channel based on a channel condition between the network device and a terminal device； determining second configuration information related to the modulation based on at least one of the channel condition and a response from the terminal device； sending， to the terminal device and via a first signaling of a higher layer， the first configuration information； and sending， to the terminal device and via a second signaling of a physical layer， the second configuration information.

In a fifth aspect， embodiments of the disclosure provide a computer readable medium. The computer readable medium stores instructions thereon， the instructions， when executed by at least one processing unit of a machine， causing the machine to implement： obtaining， from a network device and via a first signaling of a higher layer， first configuration information related to a modulation of a physical channel； obtaining， from the network device and via a second signaling of a physical layer， second configuration information related to the modulation； and determining， based on the first configuration information and the second configuration information， a modulation scheme related to the physical channel.

In a sixth aspect， embodiments of the disclosure provide a further computer readable medium. The further computer readable medium stores instructions thereon， the instructions， when executed by at least one processing unit of a machine， causing the machine to implement： determining first configuration information related to a modulation of a physical channel based on a channel condition between the network device and a terminal device； determining second configuration information related to the modulation based on at least one of the channel condition and a response from the terminal device； sending， to the terminal device and via a first signaling of a higher layer， the first configuration information； and sending， to the terminal device and via a second signaling of a physical layer， the second configuration information.

Other features and advantages of the embodiments of the present disclosure will also be apparent from the following description of specific embodiments when read in conjunction with the accompanying drawings， which illustrate， by way of example， the principles of embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the disclosure are presented in the sense of examples and their advantages are explained in greater detail below， with reference to the accompanying drawings， where

Fig. 1 illustrates a schematic diagram of a communication system 100 according to embodiments of the present disclosure；

Fig. 2 illustrates a flow chart of a method implemented at a terminal device for communication according to embodiments of the present disclosure；

Fig. 3 illustrates a flow chart of a method implemented at a terminal device according to an example embodiment of the present disclosure；

Fig. 4 illustrates a flow chart of a method implemented at a network device for communication according to embodiments of the present disclosure； and

Fig. 5 illustrates a schematic diagram of a device according to embodiments of the present disclosure.

Throughout the figures， same or similar reference numbers indicate same or similar elements.

DETAILED DESCRIPTION OF EMBODIMENTS

The subject matter described herein will now be discussed with reference to several example embodiments. It should be understood these embodiments are discussed only for the purpose of enabling those skilled persons in the art to better understand and thus implement the subject matter described herein， rather than suggesting any limitations on the scope of the subject matter.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein， the singular forms “a， ” “an” and “the” are intended to include the plural forms as well， unless the context clearly indicates otherwise. It will be further understood that the terms “comprises， ” “comprising， ” “includes” and/or “including， ” when used herein， specify the presence of stated features， integers， steps， operations， elements and/or components， but do not preclude the presence or addition of one or more other features， integers， steps， operations， elements， components and/or groups thereof.

It should also be noted that in some alternative implementations， the functions/acts noted may occur out of the order noted in the figures. For example， two functions or acts shown in succession may in fact be executed concurrently or may sometimes be executed in the reverse order， depending upon the functionality/acts involved.

As used herein， the term “communication network” refers to a network following any suitable communication standards， such as Long Term Evolution (LTE) ， LTE-Advanced (LTE-A) ， Wideband Code Division Multiple Access (WCDMA) ， High-Speed Packet Access (HSPA) ， New Radio (NR) and so on. Furthermore， the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols， including， but not limited to， the first generation (1G) ， the second generation (2G) ， 2.5G， 2.75G， the third generation (3G) ， the fourth generation (4G) ， 4.5G， the future fifth generation (5G) communication protocols， and/or any other protocols either currently known or to be developed in the future.

Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications， there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system.

The term “network device” includes， but not limited to， a base station (BS) ， a gateway， a management entity， and other suitable device in a communication system. The term “base station” or “BS” represents a node B (NodeB or NB) ， an evolved NodeB (eNodeB or eNB) ， a Remote Radio Unit (RRU) ， a radio header (RH) ， a remote radio head (RRH) ， a relay， a low power node such as a femto， a pico， and so forth.

The term “terminal device” includes， but not limited to， “user equipment (UE) ” and other suitable end device capable of communicating with the network device. By way of example， the “terminal device” may refer to a terminal， a Mobile Terminal (MT) ， a Subscriber Station (SS) ， a Portable Subscriber Station， a Mobile Station (MS) ， or an Access Terminal (AT) .

The term “modulation” used herein refers to a process of conveying message signal inside another signal that can be physically transmitted. The term “modulation scheme” used herein includes， but not limited to， modulation level， transport block table and modulation and coding scheme. The term “higher layer” used herein refers to a layer above a physical layer.

As described above， one possible method to improve spectral efficiencies of PDSCH is to specify optional support for 64QAM for unicast PDSCH. In RAN1 #88 agreements， 64QAM is supported for non-repeated unicast PDSCH in connected mode. Specifically， a terminal device will not utilize 64QAM unless a network device enables the utilization of 64QAM via a signaling. In RAN1 #89 agreement， a capability is introduced for Release 15 Bandwidth Reduced Low Complexity (BL) /Coverage Enhancement (CE) UE for the support of 64QAM. The 64QAM is enabled via higher layer configuration for Release 15 BL/CE UEs. The Downlink Control Information (DCI) on Physical Downlink Control Channel (PDCCH) indicates whether PDSCH is without repetition. If the DCI indicates that PDSCH is without repetition， 64QAM may be supported on PDSCH.

The current specification in TS 36.213 at section 73.2.1 states that if the BL/CE UE is configured in Coverage Extension Mode (CEMode) A， and if the PDSCH is assigned by or semi-statically scheduled by a Machine Type Communication PDCCH (MPDCCH) with DCI format 6-1A， the UE shall assume no PDSCH repetition if the higher layer parameter csi-NumRepetitionCE-r13 (i.e.， R^CSI) indicates one subframe. The term “csi-NumRepetitionCE-r13” used herein refers to the number of subframes for Channel State Indicator (CSI) reference resource. Based on the discussion in previous conferences， the terminal device is configured with 64QAM if PDSCH is free of repetition. Both DCI and the parameter R^CSI may indicate that PDSCH is without repetition. However， it is not clear whether the terminal device support 64QAM in the following situations： (1) the terminal device is configured to support 64QAM and the DCI indicates PDSCH transmission with repetition； and (2) the terminal device is configured to support 64QAM and the parameter R^CSI exceeds one.

A known conventional solution is to set the parameter R^CSI to be one if the terminal device is configured to support 64QAM. However， it requires RRC reconfiguration if the channel condition between the terminal device and the network device becomes worse and PDSCH repetition is needed.

In order to at least in part solve above and other potential problems， embodiments of the present disclosure provide a new solution for a modulation of downlink data transmission. Now some example embodiments of the present disclosure will be described below with reference to the figures. However， those skilled in the art will readily appreciate that the detailed description given herein with respect to these figures is for explanatory purpose as the present disclosure extends beyond these limited embodiments.

Fig. 1 illustrates a schematic diagram of an environment in which embodiments of the present disclosure can be implemented. The environment 100， which is a part of a communication network， includes a network device 120 and one or more terminal devices 110-1 and 110-2 (collectively referred to as “terminal device 110” ) . It should be noted that the environment 100 may also include other elements which are omitted for the purpose of clarity. The network device 120 may communicate with the terminal devices 110. It is to be understood that the number of network devices and terminal devices shown in Fig. 1 is given for the purpose of illustration without suggesting any limitations. The network 100 may include any suitable number of network devices and terminal devices.

Communications in environment 100 may be implemented according to any proper communication protocol (s) ， including， but not limited to， cellular communication protocols of the first generation (1G) ， the second generation (2G) ， the third generation (3G) ， the fourth generation (4G) and the fifth generation (5G) and on the like， wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like， and/or any other protocols currently known or to be developed in the future. Moreover， the communication may utilize any proper wireless communication technology， including but not limited to： Code Divided Multiple Address (CDMA) ， Frequency Divided Multiple Address (FDMA) ， Time Divided Multiple Address (TDMA) ， Frequency Divided Duplexer (FDD) ， Time Divided Duplexer (TDD) ， Multiple-Input Multiple-Output (MIMO) ， Orthogonal Frequency Divided Multiple Access (OFDMA) and/or any other technologies currently known or to be developed in the future.

The network device 120 may configure a modulation scheme related to a physical channel to the terminal device 110 for demodulating via higher layer configuration. For example， the network device 120 may configure the modulation scheme to the terminal device via a Radio Resource Control (RRC) signaling. The modulation scheme may be any suitable modulation schemes. The modulation scheme may include a modulation level supported by the terminal device 110 (for example， 16QAM， 64QAM and the like) . The modulation scheme may also include a transport block size table supported by the terminal device 110. The modulation scheme may further include modulation and coding scheme supported by the terminal device 110. The modulation scheme may include any suitable combination of the above. By way of example， the modulation scheme may include 64QAM. The modulation scheme may also include Quadrature Phase Shift Keying (QPSK) . The network device 120 may transmit configuration information related to modulation via signaling on higher layer and physical layer (or higher-layer signaling and physical-layer signaling) .

The terminal device 110 may determine the modulation scheme based on the configuration information for demodulating the data transmitted on the physical channel. By way of example， Table 1 below indicates the 64QAM configuration (for example， TBS configuration supporting 64QAM modulation) according to embodiments of the present disclosure.

Table 1

Fig. 2 illustrates a flow chart of method 200 in accordance with an example embodiment of the present disclosure. The method 200 may be implemented， for example， at the terminal device 110. In some embodiments， for example， the network device 120 may enable a modulation scheme (for example， 64QAM) for the terminal device 110 via higher layer signaling.

At block 205， the terminal device 110 obtains configuration information related to a modulation of a physical channel from the network device 120 and via a first signaling of a higher layer. For ease of discussion， the configuration information obtained at block 205 is referred to as “first configuration information. ”

In an example embodiment， the terminal device 110 may obtain the first configuration information via an RRC signaling. By way of example， the first configuration information may include the parameter csi-NumRepetitionCE (R^CSI) which indicates the number of subframes for CSI reference resource. The parameter csi-NumRepetitionCE may be a predetermined number (for example， one) . In other embodiments， the parameter csi-NumRepetitionCE may be greater than one， which means subframes for CSI measured on the MPDCCH have been repeated. As described above， if the parameter csi-NumRepetitionCE is one， it indicates that there is no PDSCH repetition which means that the PDSCH may support 64QAM.

At block 210， the terminal device 110 obtains configuration information related to the modulation from the network device 120 and via a second signaling of a physical layer. In some embodiments， the second configuration information may include DCI. For example， the DCI may indicate modulation and coding scheme (MCS) and repetition number. It is to be understood that the other information may be transmitted by DCI， for example， frequency hopping flag， resource block assignment flay， resource block assignment and the like. By way of example， the DCI may be DCI format 6-1A. As described above， the DCI may indicate whether PDSCH is free of repetition. For ease of discussion， the configuration information obtained at block 210 is referred to as “second configuration information. ”

At block 215， the terminal device 110 determines a modulation scheme related to the physical channel based on the first configuration information and the second configuration information. In some embodiments， the first configuration information may have higher priority than the second configuration information.

Fig. 3 illustrates an example implementation of block 215 in Fig. 2. It is to be understood that the implementation shown in Fig. 3 is only an example and those skilled in the art would appreciate that other suitable implementations may be applied at block 215. As shown in Fig. 2， the terminal device 110 may obtain the first configuration information and the second configuration information.

In an example embodiment， the first configuration information may include the parameter csi-NumRepetitionCE (R^CSI) . At block 305， the terminal device 110 may determine whether the number of subframe of CSI reference resource equals to a predetermined number. In some embodiments， the predetermined number is one.

If the number of subframe of CSI reference resource is the predetermined number， at block 310， the terminal device 110 may determine the modulation scheme to be a modulation scheme with an order exceeding a predetermined value. In some embodiments， the predetermined modulation order (Q_m) value is four. By way of example， the modulation scheme with an order exceeding a predetermined value hereinafter refers to 64QAM. It is to be understood that the modulation scheme with an order exceeding a predetermined value may be any modulation scheme with higher order， for example， 256QAM. That is to say， the terminal device 110 may demodulate PDSCH based on 64QAM. By way of example， if the terminal device 110 is configured with 64QAM by higher layer signaling and the number of subframe of CSI reference resource equals to one， it indicates that PDSCH is free of repetition. It is to be understood that the predetermined number can be any suitable value other than one.

In an embodiment where the second configuration information includes in DCI， the DCI format 6-1A may be interpreted as follows： DCI field of indicating number of repetition is reserved. That is to say， PDSCH is free of repetition. The MCS field in DCI format 6-1A UE-specific search space is extended to 5 bits by reinterpreting the frequency hopping flag as the Most Significant Bit (MSB) . The interpretation of repetition number field is reused from Table 2 (shown below) which is Table 7.1.7.1-1 in TS 36.213. The TBS may be determined using Table 7.1.7.2.1-1 (not shown) in TS 36.213. The max TBS in Release-14 is used wherever the TBS value in Table 7.1.7.2.1-1exceeds the max TBS in Release-14. It is to be understood that Table 2 is only an example and the modulation and TBS index may be determined using any suitable configuration.

Table. 2 in： PDSCH repetition levels (DCI Format 6-1A)

If the number of subframe of CSI reference resource exceeds the predetermined number， at block 315， the terminal device 110 may determine whether the transmission of the physical channel is free of repetition based on the second configuration information. In some embodiments， the second configuration information may include DCI.

If the transmission of the physical channel is free of repetition， at block 310， the terminal device 110 may determine the modulation scheme a modulation scheme with an order exceeding a predetermined value (for example， 64QAM) . By way of example， if the terminal device 110 is configured with 64QAM by higher layer signaling and the number of subframe of CSI reference resource exceeds one， it indicates that PDSCH support repetition. If the second configuration information indicates that PDSCH is free of repetition， the terminal device may determine the modulation scheme to be 64QAM.

In an embodiment where the second configuration information indicates that the number of PDSCH repetition is one， the DCI format 6-1A may be interpreted as follows. The MCS field in DCI format 6-1A UE-specific search space is extended to 5 bits by reinterpreting the frequency hopping flag as the Most Significant Bit (MSB) . The interpretation of repetition number field is reused from Table 2 (shown above) which is Table 7.1.7.1-1 in TS 36.213. The TBS is determined using Table 7.1.7.2.1-1 (not shown) in TS 36.213. The max TBS in Release-14 is used wherever the TBS value in Table 7.1.7.2.1-1exceeds the max TBS in Release-14.

If the transmission of the physical channel is with repetition， which is according to the indication by repetition number field in DCI at block 315. at block320， the terminal device 110 may assume the modulation scheme to be a modulation scheme with an modulation order being or being below a predetermined value. In some embodiments， the predetermined value is four. By way of example， the modulation scheme with an order being below a predetermined value may be 16QAM and/or QPSK. In an embodiment where the second configuration information indicates that PDSCH is with repetition， the terminal device 110 may determine the PDSCH falls back to Release-14 modulation scheme. In an example embodiment， the terminal device 110 may determine the modulation scheme to be 16QAM. In another embodiment， the terminal device 110 may determine the modulation scheme to be QPSK.

Fig. 4 illustrates a flow chart of method 400 in accordance with an example embodiment of the present disclosure. In some embodiments， the method 400 can be implemented at the network device 120.

At block 405， the network device 120 determines first configuration information related to a modulation of a physical channel based on a channel condition between the network device 120 and the terminal device 110. In some embodiments， the first configuration information may include the parameter csi-NumRepetitionCE (R^CSI) .

In some embodiments， if the network device 120 determines that the channel condition between the network device 120 and the terminal device 110 is good enough for 64QAM， the network device 120 may determine the parameter csi-NumRepetitionCE (R^CSI) to be a predetermined number. For example， the network device 120 may determine the channel condition based on channel quality indicator. If the network device 120 determine the parameter csi-NumRepetitionCE (R^CSI) to be one， the terminal device 110 may determine the highest modulation scheme related to PDSCH is 64QAM. In some embodiments， if the channel condition between the network device 120 and the terminal device 110 is not good enough for 64QAM， the network device 120 may determine the parameter csi-NumRepetitionCE (R^CSI) to be greater than one.

In an example embodiment， if the network device 120 determines that the channel condition is stable， the network device 120 may determine the parameter csi-NumRepetitionCE (R^CSI) to be a predetermined number. Ifthe network device 120 determine the parameter csi-NumRepetitionCE (R^CSI) to be one， the terminal device 110 may determine the modulation scheme related to PDSCH is 64QAM. In some embodiments， if the network device 120 determines that the channel condition is not stable， the network device 120 may determine the parameter csi-NumRepetitionCE (R^CSI)to be greater than one.

At block 410， the network device 120 may determine second configuration information related to the modulation based on at least one of the channel condition and a response from the terminal device. In some embodiments， the second configuration may include DCI. In some embodiments， if the network device 120 determines that the channel condition is good， the network device 120 may determine the second configuration information to indicate that the PDSCH is free of repetition. In other embodiments， if the network device 120 determines that the channel condition is not good， the network device 120 may determine the second configuration information to indicate that the PDSCH is with of repetition. In an example embodiment， the network device 120 may receive negative acknowledgement (NACK) from the terminal device 110 for sever times. By way of example， if the number of NACK received from the terminal device 110 exceeds a threshold (for example， 5 times) ， the network device 120 may determine the second configuration information to indicate that the PDSCH is with of repetition.

At block 415， the network device 120 may send the first configuration information to the terminal device 110 and via a first signaling of a higher layer. In some embodiments， the first signaling may be an RRC signaling. At block 420， the network device 120 may send the second configuration information to the terminal device 110 and via a second signaling of a physical layer.

In this way， the network device 120 is able to configure a modulation related to the physical channel in a more flexible method. For example， if the channel condition is good and stable， the network device 120 may configure 64QAM via an RRC signaling. If the channel condition is not stable， since the signaling on the physical layer is more dynamic than that on the higher layer， the network device 120 may configure the modulation dynamically via the signaling on the physical layer.

Fig. 5 is a simplified block diagram of a device 500 that is suitable for implementing embodiments of the present disclosure. The device 500 may be implemented at the network device 120. The device 500 may also be implemented at the terminal device 110. As shown， the device 500 includes one or more processors 510， one or more memories 520 coupled to the processor (s) 510， one or more transmitters and/or receivers (TX/RX) 540 coupled to the processor 510.

The processor 510 may be of any type suitable to the local technical network， and may include one or more of general purpose computers， special purpose computers， microprocessors， digital signal processors (DSPs) and processors based on multicore processor architecture， as non-limiting examples. The device 500 may have multiple processors， such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.

The memory 520 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology， such as a non-transitory computer readable storage medium， semiconductor based memory devices， magnetic memory devices and systems， optical memory devices and systems， fixed memory and removable memory， as non-limiting examples.

The memory 520 stores at least a part of a program 530. The TX/RX 540 is for bidirectional communications. The TX/RX 540 has at least one antenna to facilitate communication， though in practice an Access Node mentioned in this application may have several ones. The communication interface may represent any interface that is necessary for communication with other network elements.

The program 530 is assumed to include program instructions that， when executed by the associated processor 510， enable the device 500 to operate in accordance with the embodiments of the present disclosure， as discussed herein with reference to Figs. 2 to 4. That is， embodiments of the present disclosure can be implemented by computer software executable by the processor 510 of the device 500， or by hardware， or by a combination of software and hardware.

While this specification contains many specific implementation details， these should not be construed as limitations on the scope of any disclosure or of what may be claimed， but rather as descriptions of features that may be specific to particular embodiments of particular disclosures. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely， various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination. Moreover， although features may be described above as acting in certain combinations and even initially claimed as such， one or more features from a claimed combination can in some cases be excised from the combination， and the claimed combination may be directed to a sub-combination or variation of a sub-combination.

Similarly， while operations are depicted in the drawings in a particular order， this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order， or that all illustrated operations be performed， to achieve desirable results. In certain circumstances， multitasking and parallel processing may be advantageous. Moreover， the separation of various system components in the embodiments described above should not be understood as requiring such separation in all embodiments， and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.

Various modifications， adaptations to the foregoing exemplary embodiments of this disclosure may become apparent to those skilled in the relevant arts in view of the foregoing description， when read in conjunction with the accompanying drawings. Any and all modifications will still fall within the scope of the non-limiting and exemplary embodiments of this disclosure. Furthermore， other embodiments of the disclosures set forth herein will come to mind to one skilled in the art to which these embodiments of the disclosure pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings.

Therefore， it is to be understood that the embodiments of the disclosure are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are used herein， they are used in a generic and descriptive sense only and not for purpose of limitation.

Claims

A method implemented at a terminal device for communication， comprises：

obtaining， from a network device and via a first signaling of a higher layer， first configuration information related to a modulation of a physical channel；

obtaining， from the network device and via a second signaling of a physical layer， second configuration information related to the modulation； and

determining， based on the first configuration information and the second configuration information， a modulation scheme related to the physical channel.
The method of claim 1， wherein obtaining the first configuration comprises：

obtaining the first configuration information via a radio resource control (RRC) signaling.
The method of claim 1， wherein determining the modulation scheme comprises：

in response to the first configuration information indicating that the number of subframe of Channel State Information (CSI) reference resource is a predetermined number， determining the modulation scheme to be a modulation scheme with an order exceeding a predetermined value.
The method of claim 1， wherein determining the modulation scheme related to the PDSCH comprises：

determining the modulation scheme to be a modulation scheme with an order exceeding a predetermined value in response to，

the first configuration information indicating that the number of subframe of Channel State Information (CSI) reference resource exceeds a predetermined number， and

the second configuration information indicating that the transmission of the physical channel is free of repetition.
The method of claim 1， wherein determining the modulation scheme comprises：

determining the modulation scheme to be a modulation scheme with an order being or being below a predetermined value in response to，

in the first configuration information indicating that the number of subframe of Channel State Information (CSI) reference resource exceeds a predetermined number， and

the second configuration information indicating the transmission of the physical channel with repetition.
The method of claim 1， wherein the physical channel is a Physical Downlink Shared Channel (PDSCH) .
A method implemented at a network device for communication， comprise：

determining first configuration information related to a modulation of a physical channel based on a channel condition between the network device and a terminal device；

determining second configuration information related to the modulation based on at least one of the channel condition and a response from the terminal device；

sending， to the terminal device and via a first signaling of a higher layer， the first configuration information； and

sending， to the terminal device and via a second signaling of a physical layer， the second configuration information.
The method of claim 7， wherein sending the first configuration information comprises：

sending the first configuration information to the terminal device via a radio resource control (RRC) signaling.
The method of claim 7， wherein determining the first configuration information comprises

in response to quality of the channel exceeding a predetermined threshold and changes of the channel condition being below a predetermined threshold during given time， determining the first configuration information to indicate that the number of subframe of Channel State Information (CSI) reference resource is a predetermined number.
The method of claim 7， wherein determining the second configuration information based on at least one of the channel condition and the response from the terminal device comprises：

in response to the number negative acknowledgement (NACK) receiving from the terminal device exceeding a predetermined threshold， determining the second configuration information to indicate the transmission of the physical channel with repetition.
The method of claim 7， wherein the physical channel is a Physical Downlink Shared Channel (PDSCH) .
A terminal device， comprising：

at least one processor； and

a memory coupled to the at least one processor， the memory storing instructions therein， the instructions， when executed by the at least one processor， causing the network device to perform acts including：

obtaining， from a network device and via a first signaling of a higher layer， first configuration information related to a modulation of a physical channel；

obtaining， from the network device and via a second signaling of a physical layer， second configuration information related to the modulation； and

determining， based on the first configuration information and the second configuration information， a modulation scheme related to the physical channel.
The terminal device of claim 12， wherein obtaining the first configuration comprises：

obtaining the first configuration information via a radio resource control (RRC) signaling.
The terminal device of claim 12， wherein determining the modulation scheme comprises：

in response to the first configuration information indicating that the number of subframe of Channel State Information (CSI) reference resource is a predetermined number， determining the modulation scheme to be a modulation scheme with an order exceeding a predetermined value.
The terminal device of claim 12， wherein determining the modulation scheme related to the PDSCH comprises：

determining the modulation scheme to be a modulation scheme with an order exceeding a predetermined value in response to，

the first configuration information indicating that the number of subframe of Channel State Information (CSI) reference resource exceeds a predetermined number， and

the second configuration information indicating that the transmission of the physical channel is free of repetition.
The terminal device of claim 12， wherein determining the modulation scheme comprises：

determining the modulation scheme to be a modulation scheme with an order being or being below a predetermined value in response to，

in the first configuration information indicating that the number of subframe of Channel State Information (CSI) reference resource exceeds a predetermined number， and

the second configuration information indicating the transmission of the physical channel with repetition.
The terminal device of claim 12， wherein the physical channel is a Physical Downlink Shared Channel (PDSCH) .
A network device， comprising：

at least one processor； and

a memory coupled to the at least one processor， the memory storing instructions therein， the instructions， when executed by the at least one processor， causing the terminal device to perform acts including：

determining first configuration information related to a modulation of a physical channel based on a channel condition between the network device and a terminal device；

determining second configuration information related to the modulation based on at least one of the channel condition and a response from the terminal device；

sending， to the terminal device and via a first signaling of a higher layer， the first configuration information； and

sending， to the terminal device and via a second signaling of a physical layer， the second configuration information.
The network device of claim 18， wherein sending the first configuration information comprises：

sending the first configuration information to the terminal device via a radio resource control (RRC) signaling.
The network device of claim 18， wherein determining the first configuration information comprises

in response to quality of the channel exceeding a predetermined threshold and changes of the channel condition being below a predetermined threshold during given time， determining the first configuration information to indicate that the number of subframe of Channel State Information (CSI) reference resource is a predetermined number.
The network device of claim 18， wherein determining the second configuration information based on at least one of the channel condition and the response from the terminal device comprises：

in response to the number negative acknowledgement (NACK) receiving from the terminal device exceeding a predetermined threshold， determining the second configuration information to indicate the transmission of the physical channel with repetition.
The network device of claim 18， wherein the physical channel is a Physical Downlink Shared Channel (PDSCH) .
A computer readable medium storing instructions thereon， the instructions， when executed by at least one processing unit of a machine， causing the machine to perform the method according to any one of claims 1-6.
A computer readable medium storing instructions thereon， the instructions， when executed by at least one processing unit of a machine， causing the machine to perform the method according to any one of claims 7-11.