Data transmission method, terminal and base station

Abstract

The present application provides a data transmission method, a terminal and a base station. The method includes: the terminal receives public information according to a first physical resource block index; the first physical resource block index is determined according to a first bandwidth and / or a first position in the frequency domain; the terminal transmits terminal-specific information according to a second physical resource block index; the second physical resource block index is determined according to a second bandwidth and / or a second position in the frequency domain. The present application ensures correct communication between the base station and the terminal by determining the PRB index.

Description

[0001] This application claims the priority of a Chinese patent application with the application number 201710682190.3 and the application title "Data Transmission Method, Terminal and Base Station", which was filed with the Chinese Patent Office on August 10, 2017. The entire content of which is incorporated herein by reference. Technical Field

[0002] This application relates to the field of communication technologies, and in particular, to a data transmission method, a terminal, and a base station. Background Art

[0003] In a wireless communication system, a terminal usually transmits reference signals and data channel information according to a Physical Resource Block (PRB) index. In a Long Term Evolution (LTE) system, since synchronization signals are usually located on 72 subcarriers in the middle of a downlink carrier, a terminal can blindly detect the synchronization signals to determine the center position of the downlink carrier, and then can determine the PRB index according to the (maximum) carrier bandwidth. The terminal will be able to transmit reference signals and data channel information according to the PRB index.

[0004] However, in a New Radio (NR), synchronization signals are not necessarily located in the middle of a downlink carrier, a terminal cannot know the center position of the carrier, and there may be multiple synchronization signals in the frequency domain of a carrier. Therefore, how to determine the PRB index to ensure correct communication between a base station and a terminal is a technical problem that needs to be solved urgently at present. Summary of the Invention

[0005] Embodiments of this application provide a data transmission method, a terminal, and a base station, which determine a PRB index to ensure correct communication between a base station and a terminal.

[0006] A first aspect of this application provides a data transmission method, including:

[0007] A terminal receives common information according to a first physical resource block index; the first physical resource block index is determined according to a first bandwidth and / or a first position in the frequency domain;

[0008] The terminal transmits terminal-specific information according to a second physical resource block index; the second physical resource block index is determined according to a second bandwidth and / or a second position in the frequency domain.

[0009] In this solution, the first PRB index is the PRB index used before a connection is established between the terminal and the base station, or the first PRB index is the PRB index used before the terminal receives a System Information Block (SIB). Additionally, the terminal can receive public information sent by the base station according to the first PRB index, where the first PRB index can be determined only according to the first bandwidth, or only according to the first location, or determined according to the first bandwidth and the first location.

[0010] In the above solution, the terminal receives public information according to the first PRB index and transmits terminal-specific information according to the second PRB index, where the first PRB index is determined according to the first bandwidth and / or the first location in the frequency domain, and the second PRB index is determined according to the second bandwidth and / or the second location in the frequency domain. Since the terminal can determine the first PRB index according to the first bandwidth and / or the first location in the frequency domain, determine the second PRB index according to the second bandwidth and / or the second location in the frequency domain, and enable the terminal to receive public information and transmit terminal-specific information according to different PRB indexes respectively, thus, the terminal can determine the PRB index and can transmit reference signals and data channel information to the base station according to the determined PRB index.

[0011] Optionally, the first location is the frequency domain location of the synchronization signal block or determined according to the first information, and the second location is the carrier center location or determined according to the second information.

[0012] Optionally, the first information is indicated by the master message block.

[0013] Optionally, the second information is indicated by the master message block, the system information block, or radio resource control signaling.

[0014] Optionally, the first bandwidth is not greater than the minimum terminal bandwidth capability or determined according to the minimum terminal bandwidth capability or determined according to the maximum carrier bandwidth, and the second bandwidth is determined according to the maximum carrier bandwidth.

[0015] In this solution, the minimum terminal bandwidth capability is the minimum value among the maximum bandwidth capabilities of all terminals, the terminal maximum bandwidth capability is the maximum bandwidth that the terminal can support, that is, the maximum number of PRB blocks that the terminal can transmit simultaneously. The maximum downlink carrier bandwidth is the maximum number of PRBs included in the downlink carrier, or the number of PRBs that the base station can transmit simultaneously.

[0016] Optionally, the first bandwidth is not greater than the minimum terminal bandwidth capability or determined according to the minimum terminal bandwidth capability or determined according to the maximum carrier bandwidth, and the second bandwidth is the size of the carrier bandwidth portion.

[0017] In this solution, the maximum downlink carrier bandwidth is the maximum number of PRBs included in the downlink carrier or the number of PRBs that the base station can transmit simultaneously. The minimum terminal bandwidth capability is the minimum value among the maximum bandwidth capabilities of all terminals, and the maximum terminal bandwidth capability is the maximum bandwidth that the terminal can support, that is, the maximum number of PRB blocks that the terminal can transmit simultaneously.

[0018] Optionally, the maximum carrier bandwidth is determined according to the subcarrier spacing.

[0019] Optionally, the common information includes at least one of the following information: the reference signal for demodulating the common control information, the reference signal for demodulating the common data channel information, the common control information, or the common data channel information.

[0020] Optionally, the terminal-specific information includes at least one of the following information: the reference signal for demodulating the terminal-specific control information, the reference signal for demodulating the terminal-specific data channel information, or the channel measurement reference signal.

[0021] Optionally, the method further includes:

[0022] The terminal determines the carrier bandwidth part for scheduling the terminal-specific data channel information according to the second physical resource block index.

[0023] In the above solution, the carrier bandwidth part refers to a part of the channel bandwidth, which can be the bandwidth determined in the first step of the two-level resource allocation during data transmission and can be a continuous resource in the frequency domain.

[0024] Optionally, after the terminal determines the carrier bandwidth part for scheduling the terminal-specific data channel information according to the second physical resource block index, the method further includes:

[0025] The terminal transmits the physical resources for transmitting the terminal-specific data channel information within the carrier bandwidth part.

[0026] The second aspect of this application provides a data transmission method, including:

[0027] The base station transmits common information according to the first physical resource block index; the first physical resource block index is determined according to the first bandwidth and / or the first position in the frequency domain;

[0028] The base station transmits terminal-specific information according to the second physical resource block index; the second physical resource block index is determined according to the second bandwidth and / or the second position in the frequency domain.

[0029] In this solution, the first PRB index is the PRB index used before a connection is established between the terminal and the base station, or the first PRB index is the PRB index used before the terminal receives the SIB. Additionally, the base station can send public information to the terminal according to the first PRB index, where the first PRB index can be determined only according to the first bandwidth, or only according to the first location, or determined according to the first bandwidth and the first location.

[0030] In the above solution, the base station sends public information to the terminal according to the first PRB index and transmits terminal-specific information according to the second PRB index, where the first PRB index is determined according to the first bandwidth and / or the first location in the frequency domain, and the second PRB index is determined according to the second bandwidth and / or the second location in the frequency domain. Since the base station can determine the first PRB index according to the first bandwidth and / or the first location in the frequency domain, determine the second PRB index according to the second bandwidth and / or the second location in the frequency domain, and enable the base station to send public information and transmit terminal-specific information according to different PRB indexes respectively, thus, the base station can determine the PRB index and can transmit reference signal and data channel information with the terminal according to the determined PRB index.

[0031] Optionally, the first location is the frequency domain location of the synchronization signal block or determined according to the first information, and the second location is the carrier center location or determined according to the second information.

[0032] Optionally, the first information is indicated by the master message block.

[0033] Optionally, the second information is indicated by the master message block or the system message block or the radio resource control signaling.

[0034] Optionally, the first bandwidth is not greater than the minimum terminal bandwidth capability or determined according to the minimum terminal bandwidth capability or determined according to the maximum carrier bandwidth, and the second bandwidth is determined according to the maximum carrier bandwidth.

[0035] In this solution, the minimum terminal bandwidth capability is the minimum value among the maximum bandwidth capabilities of all terminals, the terminal maximum bandwidth capability is the maximum bandwidth that the terminal can support, that is, the maximum number of PRB blocks that the terminal can transmit simultaneously. The maximum downlink carrier bandwidth is the maximum number of PRBs included in the downlink carrier, or the number of PRBs that the base station can send simultaneously.

[0036] Optionally, the first bandwidth is not greater than the minimum terminal bandwidth capability or determined according to the minimum terminal bandwidth capability or determined according to the maximum carrier bandwidth, and the second bandwidth is the size of the carrier bandwidth part.

[0037] In this solution, the maximum downlink carrier bandwidth is the maximum number of PRBs included in the downlink carrier or the number of PRBs that the base station can transmit simultaneously. The minimum terminal bandwidth capability is the minimum value among the maximum bandwidth capabilities of all terminals, and the maximum terminal bandwidth capability is the maximum bandwidth that the terminal can support, that is, the maximum number of PRB blocks that the terminal can transmit simultaneously.

[0038] Optionally, the maximum carrier bandwidth is determined according to the subcarrier spacing.

[0039] Optionally, the common information includes at least one of the following information: the reference signal for demodulating the common control information, the reference signal for demodulating the common data channel information, the common control information, or the common data channel information.

[0040] Optionally, the terminal-specific information includes at least one of the following information: the reference signal for demodulating the terminal-specific control information, the reference signal for demodulating the terminal-specific data channel information, or the channel measurement reference signal.

[0041] Optionally, the method further includes:

[0042] The base station determines the carrier bandwidth portion for scheduling the terminal-specific data channel information according to the second physical resource block index.

[0043] Optionally, after the base station determines the carrier bandwidth portion for scheduling the terminal-specific data channel information according to the second physical resource block index, the method further includes:

[0044] The base station transmits the physical resources for transmitting the terminal-specific data channel information within the carrier bandwidth portion.

[0045] The third aspect of this application provides a terminal, including:

[0046] A receiving module, configured to receive common information according to a first physical resource block index; the first physical resource block index is determined according to a first bandwidth and / or a first position in the frequency domain;

[0047] A transmitting module, configured to transmit terminal-specific information according to a second physical resource block index; the second physical resource block index is determined according to a second bandwidth and / or a second position in the frequency domain.

[0048] Optionally, the first position is the frequency domain position of the synchronization signal block or is determined according to the first information, and the second position is the carrier center position or is determined according to the second information.

[0049] Optionally, the first information is indicated by a master message block.

[0050] Optionally, the second information is indicated by a master message block, a system message block, or radio resource control signaling.

[0051] Optionally, the first bandwidth is not greater than the minimum terminal bandwidth capability, or is determined according to the minimum terminal bandwidth capability, or is determined according to the maximum carrier bandwidth, and the second bandwidth is determined according to the maximum carrier bandwidth.

[0052] Optionally, the first bandwidth is not greater than the minimum terminal bandwidth capability, or is determined according to the minimum terminal bandwidth capability, or is determined according to the maximum carrier bandwidth, and the second bandwidth is the size of a carrier bandwidth part.

[0053] Optionally, the maximum carrier bandwidth is determined according to the subcarrier spacing.

[0054] Optionally, the common information includes at least one of the following information: a reference signal for demodulating common control information, a reference signal for demodulating common data channel information, common control information, or common data channel information.

[0055] Optionally, the terminal-specific information includes at least one of the following information: a reference signal for demodulating terminal-specific control information, a reference signal for demodulating terminal-specific data channel information, or a channel measurement reference signal.

[0056] Optionally, the apparatus further comprises:

[0057] a determination module, configured to determine a carrier bandwidth part for scheduling terminal-specific data channel information according to the second physical resource block index.

[0058] Optionally, the transmission module is further configured to transmit physical resources for transmitting terminal-specific data channel information within the carrier bandwidth part.

[0059] A fourth aspect of the present application provides a base station, comprising:

[0060] a sending module, configured to send common information according to a first physical resource block index; the first physical resource block index is determined according to a first bandwidth and / or a first position in the frequency domain;

[0061] a transmission module, configured to transmit terminal-specific information according to a second physical resource block index; the second physical resource block index is determined according to a second bandwidth and / or a second position in the frequency domain.

[0062] Optionally, the first position is the frequency domain position of a synchronization signal block or is determined according to first information, and the second position is the carrier center position or is determined according to second information.

[0063] Optionally, the first information is indicated by a master message block.

[0064] Optionally, the second information is indicated by a master message block, a system message block, or radio resource control signaling.

[0065] Optionally, the first bandwidth is not greater than the minimum terminal bandwidth capability, or is determined according to the minimum terminal bandwidth capability, or is determined according to the maximum carrier bandwidth, and the second bandwidth is determined according to the maximum carrier bandwidth.

[0066] Optionally, the first bandwidth is not greater than the minimum terminal bandwidth capability, or is determined according to the minimum terminal bandwidth capability, or is determined according to the maximum carrier bandwidth, and the second bandwidth is the size of a carrier bandwidth part.

[0067] Optionally, the maximum carrier bandwidth is determined according to the subcarrier spacing.

[0068] Optionally, the common information includes at least one of the following: a reference signal for demodulating common control information, a reference signal for demodulating common data channel information, common control information, or common data channel information.

[0069] Optionally, the terminal-specific information includes at least one of the following: a reference signal for demodulating terminal-specific control information, a reference signal for demodulating terminal-specific data channel information, or a channel measurement reference signal.

[0070] Optionally, the apparatus further includes:

[0071] a determination module, configured to determine a carrier bandwidth part for scheduling terminal-specific data channel information according to the second physical resource block index.

[0072] Optionally, the transmission module is further configured to transmit physical resources for transmitting terminal-specific data channel information within the carrier bandwidth part.

[0073] A fifth aspect of the embodiments of the present application provides a data transmission apparatus, which includes a processor and a memory. The memory is used to store a program, and the processor calls the program stored in the memory to execute the method provided in the first aspect of the present application. This data transmission apparatus may be a terminal chip.

[0074] A sixth aspect of the embodiments of the present application provides a data transmission apparatus, which includes a processor and a memory. The memory is used to store a program, and the processor calls the program stored in the memory to execute the method provided in the second aspect of the present application. This data transmission apparatus may be a base station chip.

[0075] A seventh aspect of the embodiments of the present application provides a terminal, including at least one processing element (or chip) for executing the method in the first aspect above.

[0076] The eighth aspect of the embodiments of the present application provides a base station, including at least one processing element (or chip) for executing the method in the second aspect above.

[0077] The ninth aspect of the embodiments of the present application provides a data transmission program, which is used to execute the method in the first aspect above when executed by a processor.

[0078] The tenth aspect of the embodiments of the present application provides a program product, such as a computer-readable storage medium, including the program in the ninth aspect.

[0079] The eleventh aspect of the embodiments of the present application provides a data transmission program, which is used to execute the method in the second aspect above when executed by a processor.

[0080] The twelfth aspect of the embodiments of the present application provides a program product, such as a computer-readable storage medium, including the program in the eleventh aspect.

[0081] For the data transmission method, terminal, and base station provided by the present application, the terminal receives public information according to the first PRB index and transmits terminal-specific information according to the second PRB index. Among them, the first PRB index is determined according to the first bandwidth and / or the first position in the frequency domain, and the second PRB index is determined according to the second bandwidth and / or the second position in the frequency domain. Since the terminal can determine the first PRB index according to the first bandwidth and / or the first position in the frequency domain, determine the second PRB index according to the second bandwidth and / or the second position in the frequency domain, and enable the terminal to receive public information and transmit terminal-specific information according to different PRB indexes respectively. Thus, the terminal can determine the PRB index and can transmit reference signals and data channel information to the base station according to the determined PRB index. Description of the Drawings

[0082] Figure 1 It is a schematic diagram of the architecture of the NR system;

[0083] Figure 2 It is a signaling flowchart of the first embodiment of the data transmission method of the present application;

[0084] Figure 3a It is a schematic diagram of a method for determining the first PRB index;

[0085] Figure 3b It is another schematic diagram of a method for determining the first PRB index;

[0086] Figure 4a It is yet another schematic diagram of a method for determining the first PRB index;

[0087] Figure 4b It is yet another schematic diagram of a method for determining the first PRB index;

[0088] Figure 4c Another schematic diagram of the first PRB index determination method;

[0089] Figure 4d Another schematic diagram of the first PRB index determination method;

[0090] Figure 5a Another schematic diagram of the first PRB index determination method;

[0091] Figure 5b Another schematic diagram of the first PRB index determination method;

[0092] Figure 5c Another schematic diagram of the first PRB index determination method;

[0093] Figure 5d Another schematic diagram of the first PRB index determination method;

[0094] Figure 6a Another schematic diagram of the first PRB index determination method;

[0095] Figure 6b Another schematic diagram of the first PRB index determination method;

[0096] Figure 7a Another schematic diagram of the first PRB index determination method;

[0097] Figure 7b Another schematic diagram of the first PRB index determination method;

[0098] Figure 8a Another schematic diagram of the first PRB index determination method;

[0099] Figure 8b Another schematic diagram of the first PRB index determination method;

[0100] Figure 9 A schematic diagram of the structure of a terminal provided by an embodiment of the present application;

[0101] Figure 10 Another schematic diagram of the structure of a terminal provided by an embodiment of the present application;

[0102] Figure 11 A schematic diagram of the structure of a base station provided by an embodiment of the present application;

[0103] Figure 12 Another schematic diagram of the structure of a base station provided by an embodiment of the present application;

[0104] Figure 13 Another schematic diagram of the structure of a terminal provided by an embodiment of the present application;

[0105] Figure 14 This is another structural schematic diagram of a base station provided by an embodiment of the present application. Detailed implementation manners

[0106] Hereinafter, some terms in the present application are explained to facilitate the understanding of those skilled in the art.

[0107] 1) A terminal, also known as a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc., is a device that provides voice and / or data connectivity to a user. For example, it is a handheld device, a vehicle-mounted device, etc. with a wireless connection function. Currently, some examples of terminals are: mobile phones, tablet computers, laptop computers, palmtop computers, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc.

[0108] 2) Radio Access Network (RAN). The RAN is the part of the network that connects terminals to the wireless network. RAN nodes (or devices) are nodes (or devices) in the radio access network, also known as base stations or network devices. Currently, some examples of RAN nodes are: gNB, Transmission Reception Point (TRP), Evolved Node B (eNB), Radio Network Controller (RNC), Node B (NB), Base Station Controller (BSC), Base Transceiver Station (BTS), Home Base Station (e.g., Home Evolved Node B, or Home Node B, HNB), Base Band Unit (BBU), or Wifi Access Point (AP), etc. Additionally, in one network architecture, the RAN can include a Centralized Unit (CU) node and a Distributed Unit (DU) node.

[0109] 3) The maximum carrier bandwidth is the maximum number of Physical Resource Blocks (PRBs) contained in a carrier, which is determined according to the subcarrier spacing. For example, for frequency bands below 6 GHz, the maximum carrier bandwidth is 100 MHz. When the subcarrier spacing is 15 kHz, the maximum carrier bandwidth includes 550 PRBs; when the subcarrier spacing is 30 kHz, the maximum carrier bandwidth includes 275 PRBs; when the subcarrier spacing is 60 kHz, the maximum carrier bandwidth includes 137 PRBs. For frequency bands above 6 GHz, the maximum carrier bandwidth is 400 MHz. When the subcarrier spacing is 60 kHz, the maximum carrier bandwidth includes 550 PRBs; when the subcarrier spacing is 120 kHz, the maximum carrier bandwidth includes 275 PRBs. In particular, the maximum carrier bandwidth can be the maximum downlink carrier bandwidth or the maximum uplink carrier bandwidth.

[0110] 4) "Carrier bandwidth part" refers to a part of the channel bandwidth and can also be called "bandwidth part", "operating bandwidth" or transmission bandwidth, such as mini BP, BP Unit, BP sub-band, etc. It can be abbreviated as BP or BWP. In the embodiments of this application, the name and abbreviation of the carrier bandwidth part are not specifically limited. BWP refers to the bandwidth determined in the first step of two-level resource allocation during data transmission. It can be a continuous or discontinuous resource in the frequency domain. For example, a carrier bandwidth part includes K > 0 consecutive or non-consecutive subcarriers; or, a carrier bandwidth part is the frequency domain resource where N > 0 non-overlapping consecutive or non-consecutive resource blocks (Resource Block) are located; or, a carrier bandwidth part is the frequency domain resource where M > 0 non-overlapping consecutive or non-consecutive resource block groups (Resource Block Group, RBG) are located, and an RBG includes P > 0 consecutive RBs. A carrier bandwidth part is related to a specific set of system parameters numerology, and the set of system parameters includes at least one of subcarrier spacing and cyclic prefix (CP).

[0111] 5) System parameter numerology refers to a series of physical layer parameters in the air interface. Specifically, optionally, a BWP can correspond to a numerology. Numerology includes subcarrier spacing, type of time unit, or type of cyclic prefix (CP), etc. Taking subcarrier spacing as an example, if the terminal device supports subcarrier spacings of 15 kHz and 30 kHz, the base station can allocate a BWP with a subcarrier spacing of 15 kHz and a BWP with a subcarrier spacing of 30 kHz to the terminal device. The terminal device can switch to different BWPs according to different scenarios and service requirements, or transmit data on two or more BWPs simultaneously. When the terminal device supports multiple BWPs, the numerology corresponding to each BWP can be the same or different.

[0112] 6) The unit in this application refers to a functional unit or a logical unit. It can be in software form and its function is realized by the processor executing program code; it can also be in hardware form.

[0113] 7) "Multiple" means two or more, and other quantifiers are similar. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the front and back associated objects. The ranges described by "above" or "below" include the boundary points.

[0114] Those skilled in the art can understand that the data transmission method provided by the embodiments of this application can be applied to the 5th Generation (5G) network and subsequent evolved communication systems, and can also be applied to other wireless communication networks, such as: Universal Mobile Telecommunications System (UMTS) network, or a network that is backward compatible with LTE, etc. Figure 1 It is a schematic diagram of the architecture of the NR system, as Figure 1 shown. This system includes a terminal 10 and a RAN 20. Among them, the terminal 10 can be, for example, a UE, and the RAN 20 can be a base station. Figure 1 In the system architecture in, the protocol layer of the eNB in the Long-Term Evolution (LTE) system is split, and the functions of some protocol layers are centrally controlled in the CU node, and the functions of the remaining part or all protocol layers are distributed in the DU node, and the DU node is centrally controlled by the CU node.

[0115] In Figure 1 Based on the system architecture shown, in NR, since the synchronization signal is not necessarily located in the middle of the downlink carrier, the terminal cannot know the center position of the carrier, and there may be multiple synchronization signals in the frequency domain of a carrier. Therefore, the terminal will not be able to determine the PRB index, and thus will not be able to transmit reference signals and data channel information to the base station.

[0116] The embodiments of this application take these situations into account and propose a data transmission method. The terminal receives the common information sent by the base station according to the first PRB index, and transmits the terminal-specific information according to the second PRB index. Among them, the first PRB index is determined according to the first bandwidth and / or the first position in the frequency domain, and the second PRB index is determined according to the second bandwidth and / or the second position in the frequency domain. Since the terminal can determine the first PRB index according to the first bandwidth and / or the first position in the frequency domain, and determine the second PRB index according to the second bandwidth and / or the second position in the frequency domain, and enable the terminal to receive the common information and transmit the terminal-specific information according to different PRB indexes respectively. Thus, the terminal can determine the PRB index and can transmit reference signals and data channel information to the base station according to the determined PRB index.

[0117] Figure 2 This is the signaling flow chart of the first embodiment of the data transmission method of this application. Based on the system architecture shown above Figure 1 as shown, the method of this embodiment may include: Figure 2 as shown, the method of this embodiment may include:

[0118] Step 201, the terminal receives public information according to the first PRB index; the first PRB index is determined according to the first bandwidth and / or the first position in the frequency domain.

[0119] Optionally, for different subcarrier intervals, there are respective corresponding first PRB indexes.

[0120] Specifically, the first PRB index is the PRB index used before the connection is established between the terminal and the base station, or the first PRB index is the PRB index used before the terminal receives the SIB.

[0121] In this embodiment, the terminal may receive the public information sent by the base station according to the first PRB index, where the first PRB index may be determined only according to the first bandwidth, or only according to the first position, or determined according to the first bandwidth and the first position.

[0122] The first bandwidth may be determined according to the maximum downlink carrier bandwidth, or may be not greater than the minimum terminal bandwidth capability, or may also be determined according to the minimum terminal bandwidth capability. Optionally, the first bandwidth is a positive integer multiple of the maximum downlink carrier bandwidth. Among them, the maximum downlink carrier bandwidth is the maximum number of PRBs included in the downlink carrier, or the number of PRBs that the base station can transmit simultaneously. Optionally, the maximum downlink carrier bandwidth is determined according to the subcarrier interval corresponding to the first PRB index; the minimum terminal bandwidth capability is the minimum value among all terminal maximum bandwidth capabilities, and the terminal maximum bandwidth capability is the maximum bandwidth that the terminal can support, that is, the maximum number of PRB blocks that the terminal can transmit simultaneously.

[0123] The first position is the frequency-domain position of the synchronization signal block or is determined according to the first information. The frequency-domain position of the synchronization signal block is the lowest PRB (or the central PRB or the highest PRB) of the synchronization signal block or one of the 0th, 5th, 6th, and 11th subcarriers of the PRB or the position offset by 1 / 2 subcarrier spacing from the subcarrier. In particular, when the synchronization signal block includes K = 2K' PRBs, the central PRB is the (K' - 1)th or K'th PRB, and when the synchronization signal block includes K = 2K' + 1 PRBs, the central PRB is the K'th PRB. Additionally, the first position can also be determined according to the first information. The first position can be a PRB or one of the 0th, 5th, 6th, and 11th subcarriers of a PRB or the position offset by 1 / 2 subcarrier spacing from one of the 0th, 5th, 6th, and 11th subcarriers of a PRB. In practical applications, the base station can carry the first information configuring the first position in certain broadcast signaling and send it to the terminal. In particular, the first information can be indicated by the master message block. Optionally, the first information indicates the first offset between the first position and the frequency-domain reference position, and the frequency-domain reference position can be the frequency-domain position of the synchronization signal block.

[0124] Next, the determination method of the first PRB index will be described in detail.

[0125] The following is the first possible embodiment.

[0126] Optionally, Figure 3a is a schematic diagram of the determination method of the first PRB index. As Figure 3a shown, the first PRB index {0, 1,..., M - 1} is a common downlink PRB index. The PRB corresponding to the index 0 can be determined according to the first position in the frequency domain and the first bandwidth. On this basis, the PRB corresponding to the maximum value of the index can be determined according to the first bandwidth, where the first position is the frequency-domain position of the synchronization signal block, and the first bandwidth is determined according to the maximum downlink carrier bandwidth. Optionally, the first bandwidth is a positive integer multiple of the maximum downlink carrier bandwidth, such as 2 times.

[0127] Optionally, Figure 3b is another schematic diagram of the determination method of the first PRB index. As Figure 3b shown, the first PRB index {0, 1,..., M - 1} is a common downlink PRB index. The PRB corresponding to the index 0 can be determined according to the first position in the frequency domain. On this basis, the PRB corresponding to the maximum value of the index can be determined according to the first bandwidth, where the first position is the frequency-domain position of the synchronization signal block, and the first bandwidth is determined according to the maximum downlink carrier bandwidth. Optionally, the first bandwidth is a positive integer multiple of the maximum downlink carrier bandwidth, such as 2 times.

[0128] It should be noted that Figure 3a and Figure 3bThe PRB number in the first PRB index shown is just an example. Of course, the PRB number in the first PRB index can also be in other forms, such as numbering from right to left, or starting from the middle and numbering to the right, and then starting from the left, etc. When the PRB number in the first PRB index belongs to other forms, the determination method of the first PRB index is the same as that Figure 3a and Figure 3b shown and will not be elaborated here.

[0129] Optionally, the terminal can determine the sub - frequency - band resource where the SIB is located and / or the PDCCH resource scheduling the SIB according to the first PRB index, that is, Figure 3a and Figure 3b the resources of the common bandwidth shown. The terminal blindly detects the synchronization signal block according to the synchronization signal raster. The synchronization signal block includes a primary synchronization signal, a secondary synchronization signal, and a Physical Broadcast Channel (PBCH). The terminal determines the sub - frequency - band resource where the SIB is located according to the Master Information Block (MIB) carried by the PBCH. The sub - frequency - band resource includes the frequency - domain position and bandwidth of the sub - frequency - band, or only includes the frequency - domain position of the sub - frequency - band. The definition of the frequency - domain position of the sub - frequency - band is the same as the definition of the frequency - domain position of the synchronization signal block and will not be elaborated here. Alternatively, the terminal determines the Physical Downlink Control Channel (PDCCH) resource scheduling the SIB according to the MIB carried by the PBCH. The PDCCH resource includes the frequency - domain position and bandwidth of the PDCCH resource, or only includes the frequency - domain position of the PDCCH resource. The definition of the frequency - domain position of the PDCCH is the same as the definition of the frequency - domain position of the synchronization signal block and will not be elaborated here. Then the terminal determines the sub - frequency - band resource where the SIB is located according to the PDCCH resource or the Downlink Control Information (DCI) carried by the PDCCH.

[0130] That is to say, the first PRB index is defined within a first virtual bandwidth, which is determined according to the frequency - domain position of the synchronization signal block and the maximum carrier bandwidth. Optionally, the first virtual bandwidth is aligned with the central PRB of the synchronization signal block or one of the 0th, 5th, 6th, 11th sub - carriers of the PRB or the position offset by 1 / 2 sub - carrier interval from the sub - carrier. The first virtual bandwidth can also be referred to as the first maximum virtual bandwidth, the first nominal bandwidth, or the first maximum nominal bandwidth, which is not limited in this application.

[0131] Optionally, the terminal may further receive at least one of the DMRS of the demodulation common downlink control channel, the common downlink control channel, the DMRS of the demodulation common downlink data channel, the common downlink data channel, the DMRS of the demodulation terminal-specific control channel, the terminal-specific control channel, the DMRS of the demodulation terminal-specific data channel, or the terminal-specific data channel in the sub-band where the SIB is located according to the first PRB index. Among them, the data channel is also the shared channel. The common downlink data channel includes at least the downlink data channel scheduled by the common downlink control information. The common downlink data channel includes at least the common downlink data channel corresponding to the SIB. The terminal-specific downlink data channel includes at least the downlink data channel scheduled by the terminal downlink control information. Optionally, the terminal may further receive the common downlink control information including at least the common downlink control information for scheduling the common downlink data channel corresponding to the SIB and / or the terminal-specific downlink control information for scheduling the terminal-specific downlink data channel in the PDCCH resource according to the first PRB index.

[0132] Particularly, the base station may determine the sequence of the downlink reference signal according to the first PRB index. The base station maps part or all of the downlink reference signal sequence to at least one resource element (RE), and the base station transmits the downlink reference signal on the foregoing at least one RE. Among them, the downlink reference signal may be DMRS, and the DMRS may be used to demodulate at least one of the following channels: the common downlink data channel including at least the common downlink data channel corresponding to the SIB, the common downlink control channel including at least the common downlink control channel for scheduling the common downlink data channel corresponding to the SIB, the terminal-specific downlink control channel, and the terminal-specific downlink data channel.

[0133] In the embodiments of this application, the example is given that the base station determines the DMRS sequence and maps part or all of the sequence to the RE. For the determination methods of the sequences of other reference signals, they are similar to the determination method of the DMRS sequence and will not be elaborated here. Optionally, the other reference signals include the channel state information reference signal (CSI-RS) or the phase-tracking reference signal (PT-RS).

[0134] In a possible implementation manner, the DMRS sequence is defined by the first PRB index. Specifically, the DMRS sequence may be generated according to formula (1):

[0135]

[0136] Wherein, r(m) is the DMRS sequence, c(m) is the pseudo-random sequence, M is determined according to the maximum downlink carrier bandwidth; A is a positive integer, representing the number of REs used to transmit the DMRS in a first frequency-domain unit in the frequency domain and a first time unit in the time domain. The first frequency-domain unit includes 12K subcarriers, where K is a positive integer. The first time unit can be a symbol, a symbol group, a time slot, a time-slot group, a subframe, etc. The specific content of the first time unit is not limited in this embodiment. Optionally, when the reference signal sequence is defined within a subframe, A can be determined according to the set of system parameters corresponding to the sub-band where the reference signal is located, where the set of system parameters includes the subcarrier spacing and / or the type of CP. Optionally, when the DMRS is used to demodulate the PDCCH and / or the terminal-specific downlink control channel including at least the downlink data channel corresponding to the scheduled SIB, A is determined according to the number of symbols included in the PDCCH resource in the time domain.

[0137] As Figure 3a and Figure 3b shown, when mapping the generated DMRS sequence to the REs, the numbers of the first PRB indexes corresponding to the PRBs on the sub-band can be determined according to the frequency-domain position of the sub-band, and then the transmitted reference signal can be determined. Specifically, the DMRS sequence can be mapped according to formula (2):

[0138]

[0139] Wherein, F1(·) is a predefined function, k is the index of the subcarrier in the frequency domain, l is the index of the symbol in the time domain, p is the antenna port number, is the complex-valued modulation symbol corresponding to the antenna port number p on the RE(k, l), and n CPRB is the number of the first PRB index corresponding to the PRB on the sub-band, and B is a positive integer, representing the number of REs used to transmit the DMRS in a second frequency-domain unit in the frequency domain and a second time unit in the time domain. The second frequency-domain unit includes 12L subcarriers, where L is a positive integer. The second time unit can be a symbol, a symbol group, a time slot, a time-slot group, a subframe, etc. The specific content of the second time unit is not limited in this embodiment. Optionally, when the reference signal sequence is defined within a subframe, B is determined according to the set of system parameters corresponding to the sub-band where the DMRS is located, where the set of system parameters includes the subcarrier spacing and / or the type of CP.

[0140] Similarly, the terminal can determine the numbers of the first PRB indexes corresponding to the PRBs on the PDCCH resource according to the frequency-domain position of the PDCCH resource, and then determine the transmitted reference signal. Specifically, the DMRS sequence can be mapped according to formula (3):

[0141]

[0142] where F2(·) is a predefined function, and n CCE is the number of CCEs in the PDCCH resource, and this number is determined according to the symbol index corresponding to the CCE in the time domain and / or the PRB index corresponding to the CCE in the frequency domain. Optionally, B is determined according to the number of symbols included in the PDCCH resource in the time domain.

[0143] Based on this embodiment, the terminal does not need to know the carrier bandwidth, nor does it need to know the position of the synchronization signal block in the carrier, and can correctly receive at least one of the following channels according to the first PRB index: the common downlink data channel including at least the common downlink data channel corresponding to the SIB, the common downlink control channel including at least the common downlink control channel scheduling the common downlink data channel corresponding to the SIB, the terminal-specific downlink control channel, and the terminal-specific downlink data channel.

[0144] The following is the second possible embodiment.

[0145] Optionally, Figure 4a is another schematic diagram of the determination method of the first PRB index. As Figure 4a shown, the first PRB index {0, 1,..., P - 1} is the common downlink PRB index. The PRB corresponding to the index 0 can be determined according to the first position in the frequency domain. On this basis, the PRB corresponding to the largest index can be determined according to the first bandwidth, where the first position is the frequency domain position of the synchronization signal block, and the first bandwidth is not greater than the minimum terminal bandwidth capability.

[0146] Optionally, Figure 4b is another schematic diagram of the determination method of the first PRB index. As Figure 4b shown, the first PRB index {0, 1,..., P - 1} is the common downlink PRB index. The PRB corresponding to the index 0 can also be determined according to the first position and the first bandwidth in the frequency domain. On this basis, the PRB corresponding to the maximum value can be determined according to the first bandwidth, where the first position is the frequency domain position of the synchronization signal block, and the first bandwidth is not greater than the minimum terminal bandwidth capability.

[0147] Optionally, Figure 4c is another schematic diagram of the determination method of the first PRB index. As Figure 4c shown, the first PRB index {0, 1,..., P - 1} is the common downlink PRB index. The PRB corresponding to the index 0 can be determined according to the first position in the frequency domain. On this basis, the PRB corresponding to the maximum value can be determined according to the first bandwidth, where the first position is determined according to the first information, and the first bandwidth is not greater than the minimum terminal bandwidth capability.

[0148] Optionally, Figure 4dAnother schematic diagram of the first PRB index determination method is as follows: Figure 4d As shown, the first PRB index {0, 1,..., P - 1} is a common downlink PRB index. The PRB corresponding to index 0 can also be determined according to the first position and the first bandwidth in the frequency domain. On this basis, the PRB corresponding to the maximum value of the index can be determined according to the first bandwidth, where the first position is determined according to the first information, and the first bandwidth is not greater than the minimum terminal bandwidth capability.

[0149] It should be noted that Figures 4a - 4d The PRB numbers in the first PRB index shown are just an example. Of course, the PRB numbers in the first PRB index can also be in other forms, such as numbering from right to left, or starting from the middle, etc. When the PRB numbers in the first PRB index belong to other forms, the determination method of the first PRB index is similar to that shown in Figures 4a - 4d and will not be elaborated here.

[0150] Optionally, the terminal can determine the sub - frequency - band resources where the SIB is located and / or the PDCCH resources for scheduling the SIB according to the first PRB index, that is, Figures 4a to 4d the resources of the common bandwidth shown. The terminal blindly detects the synchronization signal block according to the synchronization signal raster. The synchronization signal block includes the primary synchronization signal, the secondary synchronization signal, and the PBCH. The terminal determines the sub - frequency - band resources where the SIB is located according to the MIB carried by the PBCH. The sub - frequency - band resources include the frequency - domain position and bandwidth of the sub - frequency - band, or only include the frequency - domain position of the sub - frequency - band. The definition of the frequency - domain position of the sub - frequency - band is the same as the definition of the frequency - domain position of the synchronization signal block and will not be elaborated here; or the terminal determines the PDCCH resources for scheduling the SIB according to the MIB carried by the PBCH. The PDCCH resources include the frequency - domain position and bandwidth of the PDCCH resources, or only include the frequency - domain position of the PDCCH resources. The definition of the frequency - domain position of the PDCCH is the same as the definition of the frequency - domain position of the synchronization signal block and will not be elaborated here. Then the terminal determines the sub - frequency - band resources where the SIB is located according to the PDCCH resources or the DCI carried by the PDCCH.

[0151] Optionally, the terminal receives at least one of the DMRS of the demodulation common downlink control channel, the common downlink control channel, the DMRS of the demodulation common downlink data channel, the common downlink data channel, the DMRS of the demodulation terminal-specific control channel, the terminal-specific control channel, the DMRS of the demodulation terminal-specific data channel, and the terminal-specific data channel in the sub-band where the SIB is located according to the first PRB index. Among them, the data channel is also the shared channel. The common downlink data channel at least includes the downlink data channel scheduled by the common downlink control information. The common downlink data channel indication includes the common downlink data channel corresponding to the SIB. The terminal-specific downlink data channel at least includes the downlink data channel scheduled by the terminal downlink control information. Optionally, the terminal may also receive the common downlink control information including at least the common downlink control information scheduling the common downlink data channel corresponding to the SIB and / or the terminal-specific downlink control information scheduling the terminal-specific downlink data channel in the PDCCH resource according to the first PRB index. Since the terminal does not report the bandwidth capability before the access is completed, in order to ensure that all terminals can correctly receive the SIB and / or the PDCCH, the bandwidth of the sub-band and / or the bandwidth of the PDCCH resource do not exceed the minimum terminal bandwidth capability. Therefore, the first bandwidth is not greater than the minimum terminal bandwidth capability.

[0152] That is to say, the first PRB index is defined within the common bandwidth determined according to the frequency domain position of the synchronization signal block or the frequency domain position indicated by the base station and the predefined or base station-indicated bandwidth.

[0153] In particular, the base station can determine the sequence of the downlink reference signal according to the first PRB index. The base station maps part or all of the downlink reference signal sequence to at least one RE, and the base station transmits the downlink reference signal on the foregoing at least one RE. Among them, the downlink reference signal may be the DMRS, and the DMRS can be used to demodulate at least one of the following channels: the common downlink data channel including at least the common downlink data channel corresponding to the SIB, the common downlink control channel including at least the common downlink control channel scheduling the common downlink data channel corresponding to the SIB, the terminal-specific downlink control channel, and the terminal-specific downlink data channel.

[0154] In the embodiments of this application, it is described by taking the base station determining the DMRS sequence and mapping part or all of the sequence to the RE as an example. For the determination methods of the sequences of other reference signals, they are similar to the determination method of the DMRS sequence and will not be elaborated here. Optionally, the other reference signals include CSI-RS and / or PT-RS.

[0155] In a possible implementation manner, the DMRS sequence is defined by the first PRB index. Specifically, the DMRS sequence can be generated according to formula (4):

[0156]

[0157] Among them, r(m) is the DMRS sequence, c(m) is the pseudo-random sequence, P is the number of RBs included in the sub-band or the number of RBs corresponding to the PDCCH resource in the frequency domain, and P is not greater than the minimum value among the maximum downlink bandwidth capabilities of all terminals. P can also be predefined; A represents the number of REs used to transmit the DMRS in a first frequency domain unit in the frequency domain and a first time unit in the time domain. Among them, the first frequency domain unit includes 12K subcarriers, K is a positive integer, and the first time unit can be a symbol, a symbol group, a time slot, a time slot group, a sub-frame, etc. For the specific content of the first time unit, this embodiment does not limit it here. Optionally, when the reference signal sequence is defined within a sub-frame, A can be determined according to the set of system parameters corresponding to the sub-band where the reference signal is located, where the set of system parameters includes the subcarrier spacing and / or the type of CP. Optionally, when the DMRS is used to demodulate a common downlink control channel and / or a terminal-specific downlink control channel including at least a common downlink data channel corresponding to scheduling SIB, A is determined according to the number of symbols included in the PDCCH resource in the time domain.

[0158] After generating the DMRS sequence, the DMRS sequence can be mapped to the RE according to formula (5):

[0159]

[0160] Among them, G1(·) is a predefined function, k is the index of the subcarrier in the frequency domain, l is the index of the symbol in the time domain, and p is the antenna port number. is the complex-valued modulation symbol corresponding to the antenna port number p on RE(k, l), B represents the number of REs used to transmit the DMRS in a second frequency domain unit in the frequency domain and a second time unit in the time domain. Among them, the second frequency domain unit includes 12L subcarriers, L is a positive integer, and the second time unit can be a symbol, a symbol group, a time slot, a time slot group, a sub-frame, etc. For the specific content of the second time unit, this embodiment does not limit it here. Optionally, when the reference signal sequence is defined within a sub-frame, B is determined according to the set of system parameters corresponding to the sub-band where the DMRS is located, where the set of system parameters includes the subcarrier spacing and / or the type of CP. Optionally, B is determined according to the number of symbols included in the PDCCH resource in the time domain.

[0161] Based on this embodiment, the terminal does not need to know the carrier bandwidth or the position of the synchronization signal block in the carrier, and can correctly receive at least one of the following channels according to the first PRB index: the common downlink data channel including at least the common downlink data channel corresponding to the SIB, the common downlink control channel including at least the common downlink control channel scheduling the common downlink data channel corresponding to the SIB, the terminal-specific downlink control channel, and the terminal-specific downlink data channel. In addition, since the common downlink data channel including at least the common downlink data channel corresponding to the SIB and / or the terminal-specific downlink control channel are both restricted within a common bandwidth not greater than the minimum terminal bandwidth capability, it is beneficial to reduce the size of the DCI and improve the transmission robustness.

[0162] The following is the third possible embodiment.

[0163] Optionally, Figure 5a Another schematic diagram of the determination method of the first PRB index is shown in Figure 5a As shown, the first PRB index {0, 1,..., Q - 1} is the common downlink PRB index. The PRB corresponding to the index 0 can be determined according to the first position in the frequency domain. On this basis, the PRB corresponding to the largest index can be determined according to the first bandwidth, where the first position is the frequency domain position of the synchronization signal block, and the first bandwidth is determined according to the minimum terminal bandwidth capability. Optionally, the first bandwidth is the minimum terminal bandwidth capability.

[0164] Optionally, Figure 5b Another schematic diagram of the determination method of the first PRB index is shown in Figure 5b As shown, the first PRB index {0, 1,..., Q - 1} is the common downlink PRB index. The PRB corresponding to the index 0 can also be determined according to the first position and the first bandwidth in the frequency domain. On this basis, the PRB corresponding to the largest index can be determined according to the first bandwidth, where the first position is the frequency domain position of the synchronization signal block, and the first bandwidth is determined according to the minimum terminal bandwidth capability. Optionally, the first bandwidth is the minimum terminal bandwidth capability.

[0165] Optionally, Figure 5c Another schematic diagram of the determination method of the first PRB index is shown in Figure 5c As shown, the first PRB index {0, 1,..., Q - 1} is the common downlink PRB index. The PRB corresponding to the index 0 can be determined according to the first position in the frequency domain. On this basis, the PRB corresponding to the largest index can be determined according to the first bandwidth, where the first position is determined according to the first information, and the first bandwidth is determined according to the minimum terminal bandwidth capability. Optionally, the first bandwidth is the minimum terminal bandwidth capability.

[0166] Optionally, Figure 5dAnother schematic diagram of the first PRB index determination method is as follows Figure 5d As shown, the first PRB index {0, 1, ..., Q - 1} is a common downlink PRB index. The PRB corresponding to index 0 can also be determined according to the first position and the first bandwidth in the frequency domain. On this basis, the PRB corresponding to the largest index can be determined according to the first bandwidth, where the first position is determined according to the first information, and the first bandwidth is determined according to the minimum terminal bandwidth capability. Optionally, the first bandwidth is the minimum terminal bandwidth capability.

[0167] It should be noted that Figure 5a and Figure 5d In the first PRB index shown, the PRB numbers are just an example. Of course, the PRB numbers in the first PRB index can also be in other forms, such as numbering from right to left, or starting from the middle and numbering to the right, and then starting from the left, etc. When the PRB numbers in the first PRB index belong to other forms, the determination method of the first PRB index is similar to that shown in Figure 5a and Figure 5d and will not be elaborated here.

[0168] Optionally, the terminal can determine the sub - frequency - band resources where the SIB is located and / or the PDCCH resources for scheduling the SIB according to the first PRB index, that is, the resources of the common bandwidth shown in Figures 5a to 5d The terminal blindly detects the synchronization signal block according to the synchronization signal raster. The synchronization signal block includes the primary synchronization signal, the secondary synchronization signal, and the PBCH. The terminal determines the sub - frequency - band resources where the SIB is located according to the MIB carried by the PBCH. The sub - frequency - band resources include the frequency - domain position and bandwidth of the sub - frequency - band, or only include the frequency - domain position of the sub - frequency - band. The definition of the frequency - domain position of the sub - frequency - band is the same as the definition of the frequency - domain position of the synchronization signal block, which will not be elaborated here; or the terminal determines the PDCCH resources for scheduling the SIB according to the MIB carried by the PBCH. The PDCCH resources include the frequency - domain position and bandwidth of the PDCCH resources, or only include the frequency - domain position of the PDCCH resources. The definition of the frequency - domain position of the PDCCH is the same as the definition of the frequency - domain position of the synchronization signal block, which will not be elaborated here. Then the terminal determines the sub - frequency - band resources where the SIB is located according to the PDCCH resources or the DCI carried by the PDCCH.

[0169] Optionally, the terminal receives at least one of the DMRS of the demodulation common downlink control channel, the common downlink control channel, the DMRS of the demodulation common downlink data channel, the common downlink data channel, the DMRS of the demodulation terminal-specific control channel, the terminal-specific control channel, the DMRS of the demodulation terminal-specific data channel, and the terminal-specific data channel in the sub-band where the SIB is located according to the first PRB index. Among them, the data channel is also the shared channel. The common downlink data channel at least includes the downlink data channel scheduled by the common downlink control information. The common downlink data channel at least includes the common downlink data channel corresponding to the SIB. The terminal-specific downlink data channel at least includes the downlink data channel scheduled by the terminal downlink control information. Optionally, the terminal may also receive the common downlink control information including at least the common downlink control information for scheduling the common downlink data channel corresponding to the SIB and / or the terminal-specific downlink control information for scheduling the terminal-specific downlink data channel in the PDCCH resource according to the first PRB index. Since the terminal does not report the bandwidth capability before access completion, in order to ensure that all terminals can correctly receive the SIB and / or PDCCH, the bandwidth of this sub-band and / or the bandwidth of this PDCCH resource do not exceed the minimum terminal bandwidth capability. Therefore, the first bandwidth may be the minimum terminal bandwidth capability.

[0170] That is to say, the first PRB index is defined within a second virtual bandwidth, and this second virtual bandwidth is determined according to the frequency-domain position of the synchronization signal block or the first frequency-domain position indicated by the base station and the minimum terminal bandwidth capability. Optionally, the center PRB of the second virtual bandwidth and the common bandwidth or one of the 0th, 5th, 6th, and 11th subcarriers of this PRB or the position offset by 1 / 2 subcarrier spacing from this subcarrier are aligned. This second virtual bandwidth may also be referred to as the first minimum virtual bandwidth, the second nominal bandwidth, the first minimum nominal bandwidth, and the present invention does not make any restrictions.

[0171] Particularly, the base station may determine the sequence of the downlink reference signal according to the first PRB index. The base station maps part or all of the downlink reference signal sequence to at least one RE, and the base station transmits the downlink reference signal on the foregoing at least one RE. Among them, the downlink reference signal may be the DMRS, and this DMRS may be used to demodulate at least one of the following channels: the common downlink data channel including at least the common downlink data channel corresponding to the SIB, the common downlink control channel including at least the common downlink control channel for scheduling the common downlink data channel corresponding to the SIB, the terminal-specific downlink control channel, and the terminal-specific downlink data channel.

[0172] In the embodiments of the present application, it is described by taking the base station determining the DMRS sequence and mapping some or all of the sequence to the REs as an example. For the determination methods of the sequences of other reference signals, they are similar to the determination method of the DMRS sequence and will not be elaborated here. Optionally, the other reference signals include CSI-RS and / or PT-RS.

[0173] In a possible implementation manner, the DMRS sequence is defined based on the minimum terminal bandwidth capability. Specifically, the DMRS sequence can be generated according to formula (6):

[0174]

[0175] where r(m) is the DMRS sequence, c(m) is the pseudo-random sequence, Q is the minimum terminal bandwidth capability; A represents the number of REs used to transmit the DMRS in a first frequency domain unit in the frequency domain and a first time unit in the time domain. Among them, the first frequency domain unit includes 12K subcarriers, K is a positive integer, and the first time unit can be a symbol, a symbol group, a time slot, a time slot group, a subframe, etc. For the specific content of the first time unit, it is not limited in this embodiment. Optionally, when the reference signal sequence is defined within a subframe, A can be determined according to the set of system parameters corresponding to the sub-band where the reference signal is located, where the set of system parameters includes the subcarrier spacing and / or the type of CP. Optionally, when the DMRS is used to demodulate the PDCCH and / or the terminal-specific downlink control channel including at least the downlink data channel corresponding to the scheduled SIB, A is determined according to the number of symbols included in the time domain of the PDCCH resource.

[0176] After generating the DMRS sequence, taking Figure 5b and Figure 5d as an example, a partial sequence of the DMRS can be mapped to the REs according to formula (7):

[0177]

[0178] where m′ = m + a1 - b1, m = 0, 1,..., B·P - 1, or or G2(·) is a predefined function, k is the index of the subcarrier in the frequency domain, l is the index of the symbol in the time domain, and p is the antenna port number. is the complex-valued modulation symbol corresponding to antenna port number p on RE(k, l), and B represents the number of REs used to transmit this DMRS in a second frequency-domain unit in the frequency domain and a second time unit in the time domain. The second frequency-domain unit includes 12L subcarriers, where L is a positive integer. The second time unit can be a symbol, a symbol group, a time slot, a time slot group, a subframe, etc. The specific content of the second time unit is not limited in this embodiment. Optionally, when the reference signal sequence is defined within a subframe, B is determined according to the set of system parameters corresponding to the sub-band where this DMRS is located, where the set of system parameters includes the subcarrier spacing and / or the type of CP. Optionally, B is determined according to the number of symbols included in the PDCCH resource in the time domain.

[0179] Optionally, the lowest PRB of the second virtual bandwidth and the common bandwidth or one of the 0th, 5th, 6th, and 11th subcarriers of this PRB is aligned with the position offset by 1 / 2 subcarrier spacing from this subcarrier. At this time, when mapping a part of this DMRS sequence to the RE, m′ = 0, 1,..., B·P - 1.

[0180] Based on this embodiment, the terminal does not need to know the carrier bandwidth, nor does it need to know the position of the synchronization signal block in the carrier, and can correctly receive at least one of the following channels according to the first PRB index: common downlink data channels including at least the common downlink data channel corresponding to the SIB, common downlink control channels including at least the common downlink control channel scheduling the common downlink data channel corresponding to the SIB, terminal-specific downlink control channels, and terminal-specific downlink data channels. In addition, since the common downlink data channels including at least the common downlink data channel corresponding to the SIB and / or the terminal-specific downlink control channels are all restricted within the common bandwidth with a bandwidth not greater than the minimum terminal bandwidth capability, it is beneficial to reduce the size of the DCI and improve the transmission robustness.

[0181] Step 202: The terminal transmits terminal-specific information according to the second PRB index; the second PRB index is determined according to the second bandwidth and / or the second position in the frequency domain. Optionally, for different subcarrier spacings, there are respective corresponding second PRB indexes.

[0182] In particular, the second PRB index is the PRB index used after a connection is established between the terminal and the base station, or the second PRB index is the PRB index used after the terminal receives the SIB.

[0183] In this embodiment, the terminal can send terminal-specific information to the base station according to the second PRB index, or can receive terminal-specific information sent by the base station according to the second PRB index, where the second PRB index can be determined only according to the second bandwidth, or only according to the second position, or can also be determined according to the second bandwidth and the second position.

[0184] The second bandwidth is determined according to the maximum carrier bandwidth or is not greater than the terminal bandwidth capability. Optionally, the second bandwidth is a positive integer multiple of the maximum carrier bandwidth. The maximum carrier bandwidth is the maximum number of PRBs included in a carrier, or the number of PRBs that the base station can transmit / receive simultaneously. Optionally, the maximum carrier bandwidth is determined according to the subcarrier spacing corresponding to the second PRB index. Optionally, the maximum carrier bandwidth can be the maximum downlink carrier bandwidth or the maximum uplink carrier bandwidth. The terminal bandwidth capability is the maximum bandwidth that the terminal can support, that is, the maximum number of PRB blocks that the terminal can transmit simultaneously. Optionally, the terminal bandwidth capability can be the terminal downlink bandwidth capability or the terminal uplink bandwidth capability. The terminal can receive data and / or signaling through the downlink bandwidth and can transmit data and / or signaling through the uplink bandwidth.

[0185] The second position is the center position of the carrier or is determined according to the second information. The center position of the carrier can be the point corresponding to k' = 0 in the baseband signal generation formula (8).

[0186]

[0187] where p is the antenna port number and μ corresponds to the subcarrier spacing configuration. is the symbol start position. is the baseband signal corresponding to the antenna port number p and the subcarrier spacing configuration μ in the t-th time slot. is the carrier bandwidth. is the number of subcarriers included in one PRB. is the complex value corresponding to the antenna port number p and the subcarrier spacing configuration μ on. is determined according to the CP type and / or the symbol start position, T sLet [[ID=]] be a time unit; the center position of the carrier can also be the PRB with the middle index in the carrier, or the lowest subcarrier (subcarrier 0) of the PRB, or the central subcarrier (subcarrier 5 or 6), or the highest subcarrier (subcarrier 11), or the position offset by 1 / 2 subcarrier interval from the subcarrier. In particular, when there are 2N PRBs in the downlink carrier, the center position of the carrier is the (N - 1)-th PRB, or the 11-th subcarrier of the PRB, or the position offset by 1 / 2 subcarrier interval from the subcarrier, or the N-th PRB, or the 0-th subcarrier of the PRB, or the position offset by 1 / 2 subcarrier interval from the subcarrier. When there are 2N + 1 PRBs in the downlink carrier, the center position of the carrier is the N-th PRB, or one of the 0-th, 5-th, 6-th, 11-th subcarriers of the PRB, or the position offset by 1 / 2 subcarrier interval from the subcarrier; optionally, the center position of the carrier can be the center position of the downlink carrier or the center position of the uplink carrier. Additionally, the second position can also be determined according to the second information. The second position can be a PRB, or one of the 0-th, 5-th, 6-th, 11-th subcarriers of a PRB, or the position offset by 1 / 2 subcarrier interval from one of the 0-th, 5-th, 6-th, 11-th subcarriers of a PRB. In practical applications, the base station can carry the second information configuring the second position in certain high-layer signaling and send it to the terminal. In particular, the second information can be indicated by the MIB, SIB, or Radio Resource Control (RRC) signaling. Optionally, the second information indicates the second offset between the second position and the frequency-domain reference position, and the frequency-domain reference position can be the position of the synchronization signal block or the frequency-domain position indicated by the base station through high-layer signaling.

[0188] Next, the determination method of the second PRB index will be described in detail.

[0189] The following is the fourth possible embodiment.

[0190] Optionally, Figure 6a is another schematic diagram of the first PRB index determination method, as Figure 6aAs shown, the second PRB index {0, 1,..., M - 1} is a common PRB index. The PRB corresponding to the index 0 can be determined according to the second position in the frequency domain. On this basis, the PRB corresponding to the largest index can be determined according to the second bandwidth, where the second position is the carrier center position or is determined according to the second information, and the second bandwidth is determined according to the maximum carrier bandwidth. In particular, when the second position is the carrier center position, the second bandwidth is the maximum carrier bandwidth. Optionally, the common PRB index can be a common downlink PRB index or a common uplink PRB index. Correspondingly, the carrier center position can be a downlink carrier center position or an uplink carrier center position. Correspondingly, the maximum carrier bandwidth can be the maximum downlink carrier bandwidth or the maximum uplink carrier bandwidth.

[0191] Optionally, Figure 6b is another schematic diagram of the determination method of the first PRB index. As Figure 6b shown, the second PRB index {0, 1,..., M - 1} is a common PRB index. The PRB corresponding to the index 0 can also be determined according to the second position and the second bandwidth in the frequency domain. On this basis, the PRB corresponding to the largest index can be determined according to the second bandwidth, where the second position is the carrier center position or is determined according to the second information, and the second bandwidth is determined according to the maximum carrier bandwidth. In particular, when the second position is the carrier center position, the second bandwidth is the maximum carrier bandwidth. Optionally, the common PRB index can be a common downlink PRB index or a common uplink PRB index. Correspondingly, the carrier center position can be a downlink carrier center position or an uplink carrier center position. Correspondingly, the maximum carrier bandwidth can be the maximum downlink carrier bandwidth or the maximum uplink carrier bandwidth.

[0192] It should be noted that Figure 6a and Figure 6b the PRB numbers in the first PRB index shown are just an example. Of course, the PRB numbers in the first PRB index can also be other ways, such as numbering from right to left, or starting from the middle and then numbering to the right and then from the left, etc. When the PRB numbers in the first PRB index belong to other forms, the determination method of the first PRB index is similar to that shown in Figure 6a and Figure 6b and will not be elaborated here.

[0193] Optionally, the terminal can determine the sub-band resource and / or PDCCH resource according to the second PRB index. As Figure 6a and Figure 6bAs shown, it includes determining downlink sub-band resources and / or downlink PDCCH resources according to the public downlink PRB index, and / or determining uplink sub-band resources and / or uplink PDCCH resources according to the public uplink PRB index. The terminal determines the sub-band resources according to SIB or RRC signaling. This sub-band can be the sub-band corresponding to the public downlink data channel information, or the carrier bandwidth part (carrier bandwidth part) of the terminal's downlink, and /

[0194] or the carrier bandwidth part of the uplink. This sub-band resource includes the frequency-domain position and bandwidth of this sub-band, or only includes the frequency-domain position of this sub-band. The definition of the frequency-domain position of the sub-band is the same as the definition of the frequency-domain position of the synchronization signal block in step 201, which will not be elaborated here; alternatively, the terminal determines the PDCCH resource according to SIB or RRC signaling. This PDCCH resource is used to schedule the public downlink data channel information and / or the terminal's downlink data channel information. This PDCCH resource includes the frequency-domain position and bandwidth of this PDCCH resource, or only includes the frequency-domain position of this PDCCH resource. The definition of the frequency-domain position of the PDCCH is the same as the definition of the frequency-domain position of the synchronization signal block in step 201, which will not be elaborated here.

[0195] Optionally, the terminal can also transmit at least one of the DMRS for demodulating the common downlink control channel, the common downlink control channel, the DMRS for demodulating the common downlink data channel, the common downlink data channel, the DMRS for demodulating the terminal-specific control channel, the terminal-specific control channel, the DMRS for demodulating the terminal-specific data channel, and the terminal-specific data channel in this sub-band according to the second PRB index. Among them, the data channel is also the shared channel. The common downlink data channel includes at least the downlink data channel scheduled by the common downlink control information, and the terminal-specific data channel includes at least the uplink / downlink data channel scheduled by the terminal's downlink control information. Optionally, the terminal can receive the common downlink control information for scheduling the common downlink data channel and / or the terminal-specific downlink control information for scheduling the terminal-specific data channel in this PDCCH resource according to the second PRB index. The terminal can receive data commands through the downlink data channel and can also send data through the uplink data channel.

[0196] That is to say, the second PRB index is defined within the third virtual bandwidth. This third virtual bandwidth is determined according to the carrier center position or the second frequency-domain position indicated by the base station and the maximum carrier bandwidth. Optionally, the center PRB of this third virtual bandwidth or one of the 0th, 5th, 6th, and 11th subcarriers of this PRB or the position offset by 1 / 2 subcarrier interval from this subcarrier is the center position or the second frequency-domain position indicated by the base station. This third virtual bandwidth can also be referred to as the second maximum virtual bandwidth, the third nominal bandwidth, the second maximum nominal bandwidth. The present invention does not make any restrictions.

[0197] Specifically, the base station may determine the sequence of the downlink reference signal according to the second PRB index. The base station maps part or all of the downlink reference signal sequence to at least one RE, and the base station transmits the downlink reference signal on the foregoing at least one RE. Among them, the downlink reference signal may be DMRS, and the DMRS may be used to demodulate at least one of the following channels: PDCCH including the scheduled common downlink data channel, the common downlink data channel including the common downlink data channel, the terminal-specific downlink control channel, and the terminal-specific downlink data channel.

[0198] In the embodiments of this application, the example where the base station determines the DMRS sequence and maps part or all of the sequence to the RE is used for illustration. For the determination methods of the sequences of other reference signals, they are similar to the determination method of the DMRS sequence and will not be elaborated here. Optionally, the other reference signals include CSI-RS, PT-RS, uplink DMRS, and sounding reference signal (SRS).

[0199] In a possible implementation manner, the DMRS sequence is defined by the second PRB index. Specifically, the DMRS sequence generation method is the same as the DMRS sequence generation method described in the first possible embodiment, that is, it can be generated according to formula (1). When mapping the generated DMRS sequence to the RE, the terminal may determine the numbers of the second PRB indexes corresponding to each PRB on the subband according to the frequency domain position of the subband, and then determine the transmitted reference signal. Specifically, the mapping method of the DMRS sequence is the same as the mapping method of the DMRS sequence described in the first possible embodiment, that is, it can be mapped according to formula (2); or, the terminal may determine the numbers of the second PRB indexes corresponding to the PRBs where each REG is located on the PDCCH resource according to the frequency domain position of the PDCCH resource, and then determine the transmitted reference signal. Specifically, the mapping method of the DMRS sequence is the same as the mapping method of the DMRS sequence described in the first possible embodiment, that is, it can be mapped according to formula (3).

[0200] Optionally, when mapping the generated DMRS sequence to the RE, the second PRB index may be represented by the terminal-specific PRB index and the offset between the frequency domain position of the subband or the frequency domain position of the PDCCH resource and the second position. The terminal-specific PRB index is defined within the subband bandwidth or the PDCCH resource bandwidth. Taking Figure 6b as an example, there is n CPRB = a + n offset + n UPRB , where or n offsetis the offset between the frequency-domain position of the sub-band or the frequency-domain position of the PDCCH resource and the second position, n UPRB is the terminal-specific PRB index.

[0201] Equivalently, the terminal-specific PRB index can be represented by the second PRB index and the offset between the frequency-domain position of the sub-band or the frequency-domain position of the PDCCH resource and the second position.

[0202] In addition, when the PRB grids before and after initial access are the same, the following situation exists: two terminals configured with MU-MIMO, where one terminal stays in the sub-band receiving the SIB after initial access, and the other terminal is configured with a bandwidth part after initial access, and this bandwidth part (partially or completely) overlaps with the sub-band. To be able to configure multi-user multiple input multiple output (MU-MIMO) for these two terminals, it is necessary to ensure that the reference symbols on the PRBs with the same index in the bandwidth parts of the two terminals are the same. At this time, the base station semi-statically (e.g., through RRC signaling) configures a third offset δ. When mapping the generated DMRS sequence to the REs, the terminal can determine the numbers of the second PRB indices corresponding to the PRBs on each sub-band according to the frequency-domain position of the sub-band, and then determine the transmitted reference signal. Specifically, the DMRS sequence can be mapped according to formula (9) or formula (10):

[0203]

[0204]

[0205] Alternatively, the terminal can determine the numbers of the second PRB indices corresponding to the PRBs where each REG is located on the PDCCH resource according to the frequency-domain position of the PDCCH resource, and then determine the transmitted reference signal. Specifically, it can be mapped according to formula (11):

[0206]

[0207] Based on this embodiment, the terminal does not need to know the carrier bandwidth and can correctly transmit at least one of the following channels according to the second PRB index: at least one of the common downlink control channel, the common downlink data channel, the terminal-specific control channel, and the terminal-specific data channel, and at least one of the following signals: the DMRS for demodulating the common downlink control channel, the DMRS for demodulating the common downlink data channel, the DMRS for demodulating the terminal-specific control channel, and the DMRS for demodulating the terminal-specific data channel. The terminal can receive data through the downlink data channel and can also send data through the uplink data channel. The terminal can receive signaling through the downlink control channel.

[0208] In addition, since two terminals with completely overlapping or partially overlapping configured sub-band resources or PDCCH resources have the same understanding of the PRB numbers within the overlapping part, the reference signal sequences mapped on each PRB have the same sequence values. In this case, MU-MIMO can be configured for these two terminals, thereby improving the system throughput. Here, the sub-band resources include not only the sub-bands corresponding to the common downlink data channel information determined according to the SIB or RRC signaling, but also can be the downlink carrier bandwidth part and / or the uplink carrier bandwidth part of the terminal, and also include the sub-bands corresponding to the common downlink data channel information configured through the MIB.

[0209] The following is the fifth possible embodiment.

[0210] Optionally, Figure 7a For another schematic diagram of the first PRB index determination method, as Figure 7a shown, the second PRB index {0, 1,..., P - 1} is the common downlink PRB index. The PRB corresponding to the index 0 can be determined according to the second position in the frequency domain. On this basis, the PRB corresponding to the largest index can be determined according to the second bandwidth. Among them, the second position is determined according to the second information, and the second bandwidth is not greater than the terminal bandwidth capability or is determined according to the minimum terminal bandwidth capability. Optionally, the second bandwidth is the minimum terminal bandwidth capability.

[0211] Optionally, Figure 7b For another schematic diagram of the first PRB index determination method, as Figure 7b shown, the second PRB index {0, 1,..., P - 1} is the common downlink PRB index. The PRB corresponding to the index 0 can also be determined according to the second position and the second bandwidth in the frequency domain. On this basis, the PRB corresponding to the largest index can be determined according to the second bandwidth. Among them, the second position is determined according to the second information, and the second bandwidth is not greater than the terminal bandwidth capability or is determined according to the minimum terminal bandwidth capability. Optionally, the second bandwidth is the minimum terminal bandwidth capability.

[0212] It should be noted that Figure 7a and Figure 7b The PRB numbers in the first PRB index shown are just examples. Of course, the PRB numbers in the first PRB index can also be in other forms, such as numbering from right to left, or starting from the middle and numbering to the right, and then starting from the left, etc. When the PRB numbers in the first PRB index belong to other forms, the determination method of the first PRB index is similar to that shown in Figure 7a and Figure 7b and will not be elaborated here.

[0213] The terminal determines the sub - band resources according to SIB or RRC signaling. The sub - band can be the sub - band corresponding to the common downlink data channel information. The sub - band resources include the frequency - domain position and bandwidth of the sub - band, or only include the frequency - domain position of the sub - band; or, the definition of the frequency - domain position of the sub - band is the same as the definition of the frequency - domain position of the synchronization signal block in step 201 and will not be elaborated here; or, the terminal determines the PDCCH resources according to SIB or RRC signaling. The PDCCH resources are used to schedule the common downlink data channel information. The PDCCH resources include the frequency - domain position and bandwidth of the PDCCH resources, or only include the frequency - domain position of the PDCCH resources. The definition of the frequency - domain position of the PDCCH resources is the same as the definition of the frequency - domain position of the synchronization signal block in step 201 and will not be elaborated here. Therefore, the terminal can determine the sub - band resources and / or PDCCH resources, as shown in Figure 7a and Figure 7b shown.

[0214] Optionally, the terminal can receive at least one of the DMRS for demodulating the common downlink data channel, the common downlink data channel, the DMRS for demodulating the common downlink control channel, and the common downlink control channel in the sub - band according to the second PRB index. Among them, the data channel is also the shared channel, and the common downlink data channel at least includes the downlink data channel scheduled by the common downlink control information. Optionally, the terminal can receive the common downlink control information for scheduling the common downlink data channel in the PDCCH resources according to the second PRB index.

[0215] In particular, the base station can determine the sequence of the downlink reference signal according to the second PRB index. The base station maps part or all of the downlink reference signal sequence to at least one RE, and the base station transmits the downlink reference signal on the aforementioned at least one RE. Among them, the downlink reference signal can be DMRS, and the DMRS can be used to demodulate at least one of the following channels: PDCCH including the scheduled common downlink data channel and / or the common downlink data channel.

[0216] In the embodiments of the present application, the base station determines the DMRS sequence and maps some or all of the sequence to the REs as an example for illustration. For the determination methods of the sequences of other reference signals, they are similar to the determination method of the DMRS sequence and will not be elaborated here. Optionally, the other reference signals include CSI-RS and / or PT-RS.

[0217] In a possible implementation manner, the DMRS sequence is defined by the second PRB index. Specifically, the DMRS sequence generation method is the same as the DMRS sequence generation method described in the second possible embodiment, that is, it can be generated according to formula (4). When mapping the generated DMRS sequence to the REs, the terminal can determine the numbers of the second PRB indexes corresponding to the PRBs on each sub-band according to the frequency domain position of the sub-band, and then determine the transmitted reference signal; or, the terminal can determine the numbers of the second PRB indexes corresponding to the PRBs where each REG is located on the PDCCH resource according to the frequency domain position of the PDCCH resource, and then determine the transmitted reference signal. Specifically, the mapping method of the DMRS sequence is the same as the mapping method of the DMRS sequence described in the second possible embodiment, that is, it can be mapped according to formula (5).

[0218] Based on this embodiment, the terminal does not need to know the carrier bandwidth and can correctly receive at least one of the following according to the second PRB index: the common downlink data channel, the DMRS for demodulating the common downlink data channel, the common downlink control channel, and the DMRS for demodulating the common downlink control channel. In addition, since the common downlink data channel is restricted within the common bandwidth not greater than the minimum terminal bandwidth capability, it is beneficial to reduce the size of the DCI and improve the transmission robustness.

[0219] The following is the sixth possible embodiment.

[0220] Optionally, Figure 8a is another schematic diagram of the determination method of the first PRB index. As Figure 8a shown, the second PRB index {0, 1,..., Q - 1} is the common downlink PRB index. The PRB corresponding to the index 0 can be determined according to the second position in the frequency domain. On this basis, the PRB corresponding to the largest index can be determined according to the second bandwidth. The second position is determined according to the second information, and the second bandwidth is the minimum terminal bandwidth capability.

[0221] Optionally, Figure 8b is another schematic diagram of the determination method of the first PRB index. As Figure 8bAs shown, the second PRB index {0, 1, ..., Q - 1} is a common downlink PRB index. The PRB corresponding to the index 0 can also be determined according to the second position and the second bandwidth in the frequency domain. On this basis, the PRB corresponding to the largest index can be determined according to the second bandwidth. Among them, the second position is determined according to the second information, and the second bandwidth is the minimum terminal bandwidth capability.

[0222] It should be noted that Figure 8a and Figure 8b the PRB numbers in the first PRB index shown are just examples. Of course, the PRB numbers in the first PRB index can also be in other ways, such as numbering from right to left, or starting from the middle and numbering to the right, and then starting from the left, etc. When the PRB numbers in the first PRB index belong to other forms, the determination method of the first PRB index is similar to that Figure 3a and Figure 3b shown, and will not be elaborated here.

[0223] The terminal determines the sub-band resources according to the SIB or RRC signaling. The sub-band can be the sub-band corresponding to the common downlink data channel information. The sub-band resources include the frequency domain position and bandwidth of the sub-band, or only include the frequency domain position of the sub-band; or, the definition of the frequency domain position of the sub-band is the same as the definition of the frequency domain position of the synchronization signal block in step 201, which will not be elaborated here; or, the terminal determines the PDCCH resources according to the SIB or RRC signaling. The PDCCH resources are used to schedule the common downlink data channel information. The PDCCH resources include the frequency domain position and bandwidth of the PDCCH resources, or only include the frequency domain position of the PDCCH resources. The definition of the frequency domain position of the PDCCH resources is the same as the definition of the frequency domain position of the synchronization signal block in step 201, which will not be elaborated here. Therefore, the terminal can determine the sub-band resources and / or PDCCH resources, as Figure 8a and Figure 8b shown.

[0224] Optionally, the terminal can receive at least one of the DMRS for demodulating the common downlink data channel, the common downlink data channel, the DMRS for demodulating the common downlink control channel, and the common downlink control channel in the sub-band according to the second PRB index. Among them, the data channel is also the shared channel, and the common downlink data channel includes at least the downlink data channel scheduled by the common downlink control information. Optionally, the terminal can receive the common downlink control information for scheduling the common downlink data channel in the PDCCH resources according to the second PRB index.

[0225] That is to say, the second PRB index is defined within a fourth virtual bandwidth, which is determined according to the second frequency-domain position indicated by the base station and the minimum terminal capability. Optionally, the fourth virtual bandwidth is aligned with the central PRB of the common bandwidth or one of the 0th, 5th, 6th, and 11th subcarriers of the PRB, or the position offset by 1 / 2 subcarrier spacing from the subcarrier. The fourth virtual bandwidth can also be referred to as the second minimum virtual bandwidth, the fourth nominal bandwidth, or the second minimum nominal bandwidth, and the present invention is not limited thereto.

[0226] Specifically, the base station can determine the sequence of the downlink reference signal according to the second PRB index. The base station maps part or all of the downlink reference signal sequence to at least one RE, and the base station transmits the downlink reference signal on the foregoing at least one RE. Among them, the downlink reference signal can be DMRS, and the DMRS can be used to demodulate at least one of the following channels: PDCCH including the scheduled common downlink data channel and / or the common downlink data channel.

[0227] In the embodiments of the present application, the example where the base station determines the DMRS sequence and maps part or all of the sequence to the RE is used for illustration. For the determination methods of the sequences of other reference signals, they are similar to the determination method of the DMRS sequence and will not be elaborated here. Optionally, the other reference signals include CSI-RS and / or PT-RS.

[0228] In a possible implementation manner, the DMRS sequence is defined by the second PRB index. Specifically, the DMRS sequence generation method is the same as the DMRS sequence generation method described in the third possible embodiment, that is, it can be generated according to formula (6). When mapping the generated DMRS sequence to the RE, the terminal can determine the transmitted reference signal according to the numbers of the second PRB index corresponding to each PRB in the subband; or the terminal can determine the numbers of the second PRB index corresponding to the PRBs where each REG is located on the PDCCH resource according to the frequency-domain position of the PDCCH resource, and then determine the transmitted reference signal. Specifically, the DMRS sequence mapping method is the same as the DMRS sequence mapping method described in the third possible embodiment, that is, it can be mapped according to formula (7).

[0229] Based on this embodiment, the terminal does not need to know the carrier bandwidth and can correctly receive at least one of the following: the common downlink data channel, the DMRS for demodulating the common downlink data channel, the common downlink control channel, and the DMRS for demodulating the common downlink control channel according to the second PRB index. In addition, since the common downlink data channel is restricted within the common bandwidth with a bandwidth not greater than the minimum terminal bandwidth capability, it is beneficial to reduce the size of the DCI and improve the transmission robustness.

[0230] The following is the seventh possible embodiment.

[0231] Optionally, the second PRB index is a terminal-specific downlink PRB index, where the terminal-specific downlink PRB index is defined in the carrier bandwidth part of the terminal. Optionally, the carrier bandwidth part can be a downlink carrier bandwidth part or an uplink carrier bandwidth part.

[0232] The terminal determines the carrier bandwidth part resources according to SIB or RRC signaling. The carrier bandwidth resources include the frequency-domain position and bandwidth of the carrier bandwidth part, or only include the frequency-domain position of the carrier bandwidth part. The definition of the frequency-domain position of the carrier bandwidth part is the same as that of the synchronization signal block in step 201 and will not be elaborated here. Alternatively, the terminal determines the PDCCH resources according to SIB or RRC signaling. The PDCCH resources are used to schedule terminal-specific downlink data channel information. The PDCCH resources include the frequency-domain position and bandwidth of the PDCCH resources, or only include the frequency-domain position of the PDCCH resources. The definition of the frequency-domain position of the PDCCH resources is the same as that of the synchronization signal block in step 201 and will not be elaborated here.

[0233] Optionally, the terminal can transmit terminal-specific data channels in the carrier bandwidth part according to the second PRB index. The terminal-specific data channels, that is, terminal-specific shared channels, include terminal-specific downlink data channels and / or terminal-specific uplink data channels. The terminal-specific data channels at least include data channels scheduled by terminal downlink control information. Optionally, the terminal can receive terminal-specific downlink control information for scheduling terminal-specific uplink / downlink data in the PDCCH resources according to the second PRB index. Here, the concept of transmission can be understood as sending and / or receiving, and the present application does not make any restrictions.

[0234] The following is the eighth possible embodiment.

[0235] A resource allocation method in a sub-band. The sub-band can be a common bandwidth, a downlink carrier bandwidth part, or an uplink carrier bandwidth part.

[0236] In the resource allocation method, the resource allocation domain in the resource allocation information includes a Resource Indication Value (RIV). The RIV corresponds to the offset from the lowest PRB of the sub-band (RB offset ) and the number of consecutive RBs or consecutive virtual RBs allocated (L CRBs ). The RIV is defined as follows:

[0237] If Then

[0238]

[0239] Otherwise

[0240]

[0241] where L CRBs ≥ 1 and does not exceed represents the number of RBs included in the sub - band corresponding to the system parameter configuration μ.

[0242] The terminal determines the allocated consecutive RBs or consecutive virtual RBs according to the RIV as {RB0 + RB offset ,..., RB0 + RB offset + L CRBs - 1}, where RB0 is the number of the common PRB index corresponding to the lowest PRB of the sub - band, and the common PRB index is the first PRB index in the first possible embodiment and / or the second PRB index in the fourth possible embodiment, that is, the common PRB index is determined according to the maximum carrier bandwidth.

[0243] In addition, it can be understood that the execution order of the above step 201 and step 202 is only an illustration. There is no distinction in the execution order between step 201 and step 202. Step 201 can be executed first, and then step 202; or step 202 can be executed first, and then step 201; or these two steps can be executed simultaneously. The embodiments of the present application do not make special limitations on this.

[0244] It should be noted that, among the above - mentioned different embodiments, the same or similar concepts or processes can be mutually referred to or combined. Dividing them into different embodiments is only to more clearly illustrate the present application.

[0245] In the data transmission method provided by the embodiments of the present application, the terminal receives common information according to the first PRB index and transmits terminal - specific information according to the second PRB index. Among them, the first PRB index is determined according to the first bandwidth and / or the first position in the frequency domain, and the second PRB index is determined according to the second bandwidth and / or the second position in the frequency domain. Since the terminal can determine the first PRB index according to the first bandwidth and / or the first position in the frequency domain, determine the second PRB index according to the second bandwidth and / or the second position in the frequency domain, and enable the terminal to receive common information and transmit terminal - specific information according to different PRB indexes respectively. Thus, the terminal can determine the PRB index and can transmit reference signals and data channel information to the base station according to the determined PRB index.

[0246] Figure 9 For a schematic structural diagram of a terminal provided by an embodiment of the present application, see Figure 9 , the terminal includes: a receiving unit 11 and a transmitting unit 12, where:

[0247] The receiving unit 11 receives common information according to the first physical resource block index; the first physical resource block index is determined according to the first bandwidth and / or the first position in the frequency domain;

[0248] The transmitting unit 12 transmits terminal-specific information according to the second physical resource block index; the second physical resource block index is determined according to the second bandwidth and / or the second position in the frequency domain.

[0249] The terminal provided by the embodiment of the present application can execute the corresponding method embodiment above, and its implementation principle and technical effect are similar, which will not be elaborated here.

[0250] Optionally, the first position is the frequency domain position of the synchronization signal block or is determined according to the first information, and the second position is the carrier center position or is determined according to the second information.

[0251] Optionally, the first information is indicated by the master message block.

[0252] Optionally, the second information is indicated by the master message block, the system message block or the radio resource control signaling.

[0253] Optionally, the first bandwidth is not greater than the minimum terminal bandwidth capability or is determined according to the minimum terminal bandwidth capability or is determined according to the maximum carrier bandwidth, and the second bandwidth is determined according to the maximum carrier bandwidth.

[0254] Optionally, the first bandwidth is not greater than the minimum terminal bandwidth capability or is determined according to the minimum terminal bandwidth capability or is determined according to the maximum carrier bandwidth, and the second bandwidth is the size of the carrier bandwidth part.

[0255] Optionally, the maximum carrier bandwidth is determined according to the subcarrier spacing.

[0256] Optionally, the common information includes at least one of the following information: a reference signal for demodulating common control information, a reference signal for demodulating common data channel information, common control information, or common data channel information.

[0257] Optionally, the terminal-specific information includes at least one of the following information: a reference signal for demodulating terminal-specific control information, a reference signal for demodulating terminal-specific data channel information, or a channel measurement reference signal.

[0258] Figure 10 Another structural schematic diagram of a terminal provided by the embodiment of the present application. Based on the embodiment shown in Figure 9 the terminal further includes a determination module 13, where:

[0259] The determining module 13 determines a carrier bandwidth part for scheduling terminal-specific data channel information according to the second physical resource block index.

[0260] Optionally, the transmitting module 12 is further configured to transmit physical resources for transmitting terminal-specific data channel information within the carrier bandwidth part.

[0261] The terminal provided by the embodiment of the present application can execute the corresponding method embodiment above, and its implementation principle and technical effect are similar, which will not be elaborated here.

[0262] It should be noted that it should be understood that the division of each unit of the above terminal is only a logical function division. In actual implementation, it can be fully or partially integrated into a physical entity, or physically separated. And these units can all be implemented in the form of software called by a processing element; they can also all be implemented in the form of hardware; or some units can be implemented in the form of software called by a processing element, and some units can be implemented in the form of hardware. For example, the sending unit can be a separately established processing element, or can be integrated in a certain chip of the terminal. In addition, it can also be stored in the memory of the terminal in the form of a program, and called and executed by a certain processing element of the terminal to perform the function of the sending unit. The implementation of other units is similar. In addition, all or part of these units can be integrated together or independently implemented. The processing element here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each of the above units can be completed by the integrated logic circuit in the processor element in hardware or in the form of instructions in software. In addition, the above sending unit is a unit for controlling sending, and can receive information sent by the base station through the sending device of the terminal, such as an antenna and a radio frequency device.

[0263] The above units can be one or more integrated circuits configured to implement the above method, for example: one or more application specific integrated circuits (ASICs), or, one or more digital signal processors (DSPs), or, one or more field programmable gate arrays (FPGAs), etc. Again, when a certain unit above is implemented in the form of a processing element scheduling program, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processors that can call programs. Again, these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0264] Figure 11 A schematic structural diagram of a base station provided by an embodiment of the present application. Refer to Figure 11 , the base station includes: a transmitting unit 21 and a transmission unit 22, where:

[0265] The transmitting unit 21 is configured to transmit common information according to a first physical resource block index; the first physical resource block index is determined according to a first bandwidth and / or a first position in the frequency domain;

[0266] The transmission unit 22 is configured to transmit terminal-specific information according to a second physical resource block index; the second physical resource block index is determined according to a second bandwidth and / or a second position in the frequency domain.

[0267] The base station provided by the embodiment of the present application can execute the corresponding method embodiment above, and its implementation principle and technical effect are similar, which will not be elaborated here.

[0268] Optionally, the first position is the frequency domain position of the synchronization signal block or determined according to the first information, and the second position is the carrier center position or determined according to the second information.

[0269] Optionally, the first information is indicated by a master message block.

[0270] Optionally, the second information is indicated by a master message block, a system message block, or radio resource control signaling.

[0271] Optionally, the first bandwidth is not greater than the minimum terminal bandwidth capability or determined according to the minimum terminal bandwidth capability or determined according to the maximum carrier bandwidth, and the second bandwidth is determined according to the maximum carrier bandwidth.

[0272] Optionally, the first bandwidth is not greater than the minimum terminal bandwidth capability or determined according to the minimum terminal bandwidth capability or determined according to the maximum carrier bandwidth, and the second bandwidth is the size of the carrier bandwidth portion.

[0273] Optionally, the maximum carrier bandwidth is determined according to the subcarrier spacing.

[0274] Optionally, the common information includes at least one of the following information: a reference signal for demodulating common control information, a reference signal for demodulating common data channel information, common control information, or common data channel information.

[0275] Optionally, the terminal-specific information includes at least one of the following information: a reference signal for demodulating terminal-specific control information, a reference signal for demodulating terminal-specific data channel information, or a channel measurement reference signal.

[0276] Figure 12 Another schematic structural diagram of a base station provided by an embodiment of the present application. The embodiment of the present application is inFigure 11 Based on the illustrated embodiments, the base station further includes a determination module 23, where:

[0277] The determination module 23 determines a carrier bandwidth part for scheduling terminal-specific data channel information according to the second physical resource block index.

[0278] Optionally, the transmission module 22 is further configured to transmit physical resources for transmitting terminal-specific data channel information within the carrier bandwidth part.

[0279] The base station provided by the embodiments of the present application can execute the corresponding method embodiments described above. The implementation principles and technical effects are similar and will not be elaborated here.

[0280] It should be noted that it should be understood that the division of each unit of the above base station is only a logical function division. In actual implementation, it can be fully or partially integrated into a physical entity, or physically separated. And these units can all be implemented in the form of software called by a processing element; they can also all be implemented in the form of hardware; or some units can be implemented in the form of software called by a processing element, and some units can be implemented in the form of hardware. For example, the sending unit can be a separately established processing element, or can be integrated in a certain chip of the base station. In addition, it can also be stored in the memory of the base station in the form of a program, and called and executed by a certain processing element of the base station to perform the function of the sending unit. The implementation of other units is similar. In addition, these units can be fully or partially integrated together or independently implemented. The processing element mentioned here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each of the above units can be completed by the integrated logic circuit in the processor element or the instruction in the form of software. In addition, the above sending unit is a unit for controlling transmission, and can receive information sent by the terminal through a sending device of the base station, such as an antenna and a radio frequency device.

[0281] The above units may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or, one or more digital signal processors (DSPs), or, one or more Field Programmable Gate Arrays (FPGAs), etc. For another example, when a certain unit above is implemented in the form of a processing element scheduler, the processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processors that can call programs. For another example, these units may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0282] Figure 13 Another structural schematic diagram of a terminal provided by an embodiment of this application. As Figure 13 shown, the terminal includes: a processor 110, a memory 120, and a transceiver device 130. The transceiver device 130 may be connected to an antenna. In the downlink direction, the transceiver device 130 receives information sent by a base station through the antenna and sends the information to the processor 110 for processing. In the uplink direction, the processor 110 processes the data of the terminal and sends it to the base station through the transceiver device 130.

[0283] The memory 120 is used to store programs for implementing the above method embodiments, or Figures 9 - 10 the programs of each unit of the embodiments shown, and the processor 110 calls the programs to execute the operations of the above method embodiments to implement Figures 9 - 10 each unit shown.

[0284] Alternatively, some or all of the above units may also be implemented by being embedded in a certain chip of the terminal in the form of an integrated circuit. And they can be implemented separately or integrated together. That is, the above units may be configured as one or more integrated circuits for implementing the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or, one or more digital signal processors (DSPs), or, one or more Field Programmable Gate Arrays (FPGAs), etc.

[0285] Figure 14 Another structural schematic diagram of a base station provided by an embodiment of this application. AsFigure 14 As shown in Figure 14 , the base station includes: an antenna 110, a radio frequency device 120, and a baseband device 130. The antenna 110 is connected to the radio frequency device 120. In the uplink direction, the radio frequency device 120 receives the information sent by the terminal through the antenna 110 and sends the information sent by the terminal to the baseband device 130 for processing. In the downlink direction, the baseband device 130 processes the information of the terminal and sends it to the radio frequency device 120. After the radio frequency device 120 processes the information of the terminal, it is sent to the terminal through the antenna 110.

[0286] In one implementation, each of the above units is implemented in the form of a processing element scheduler. For example, the baseband device 130 includes a processing element 131 and a storage element 132. The processing element 131 calls the program stored in the storage element 132 to execute the methods in the above method embodiments. In addition, the baseband device 130 may further include an interface 133 for interacting with the radio frequency device 120. This interface is, for example, a common public radio interface (CPRI).

[0287] In another implementation, the above units may be one or more processing elements configured to implement the above methods. These processing elements are provided on the baseband device 130. Here, the processing elements may be integrated circuits, such as: one or more ASICs, or one or more DSPs, or one or more FPGAs, etc. These integrated circuits may be integrated together to form a chip.

[0288] For example, each of the above units may be integrated together and implemented in the form of a system-on-a-chip (SOC). For example, the baseband device 130 includes an SOC chip for implementing the above methods. The processing element 131 and the storage element 132 may be integrated in the chip, and the functions of the above methods or each of the above units are implemented in the form of the processing element 131 calling the program stored in the storage element 132; or, at least one integrated circuit may be integrated in the chip for implementing the above methods or the functions of each of the above units; or, the above implementation methods may be combined, and the functions of some units are implemented in the form of the processing element calling the program, and the functions of some units are implemented in the form of the integrated circuit.

[0289] Regardless of the method adopted, in short, the above base station includes at least one processing element, a storage element, and a communication interface, where at least one processing element is used to execute the method provided in the above method embodiments. The processing element can execute some or all of the steps in the above method embodiments in a first way, that is, by executing the program stored in the storage element; or in a second way, that is, by combining the integrated logic circuit in the processor element with instructions to execute some or all of the steps in the above method embodiments; of course, it can also combine the first way and the second way to execute the method provided in the above method embodiments.

[0290] The processing element here is the same as the above description and can be a general-purpose processor, such as a Central Processing Unit (CPU), or can also be one or more integrated circuits configured to implement the above method, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more digital signal processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), etc.

[0291] The storage element can be a memory or a collective term for multiple storage elements.

[0292] This application also provides a storage medium, including: a readable storage medium and a computer program, where the computer program is used to implement the data transmission method provided in any of the foregoing embodiments.

[0293] This application also provides a program product, which includes a computer program (i.e., execution instructions), and the computer program is stored in a readable storage medium. At least one processor of the terminal can read the computer program from the readable storage medium, and at least one processor executes the computer program to enable the terminal to implement the data transmission methods provided in the foregoing various embodiments.

[0294] The embodiments of this application also provide a data transmission device, including at least one storage element and at least one processing element. The at least one storage element is used to store a program, and when the program is executed, it enables the data transmission device to perform the operations of the terminal in any of the above embodiments. This device can be a terminal chip.

[0295] This application also provides a storage medium, including: a readable storage medium and a computer program, where the computer program is used to implement the data transmission method provided in any of the foregoing embodiments.

[0296] The present application also provides a program product, which includes a computer program (i.e., execution instructions), and the computer program is stored in a readable storage medium. At least one processor of the base station can read the computer program from the readable storage medium, and the execution of the computer program by at least one processor enables the base station to implement the data transmission methods provided in the foregoing various embodiments.

[0297] An embodiment of the present application also provides a data transmission device, which includes at least one storage element and at least one processing element. The at least one storage element is used to store a program, and when the program is executed, it enables the data transmission device to perform the operations of the base station in any of the foregoing embodiments. The device may be a base station chip.

[0298] All or part of the steps of implementing the foregoing method embodiments can be completed by hardware related to program instructions. The foregoing program can be stored in a readable memory. When the program is executed, it performs the steps including the foregoing method embodiments; and the foregoing memory (storage medium) includes: read-only memory (abbreviation: ROM), RAM, flash memory, hard disk, solid-state drive, magnetic tape, floppy disk, optical disc, and any combination thereof.

Claims

1. A method for data communication, characterized in that, Including: The base station transmits a first demodulation reference signal, and the first demodulation reference signal is used to demodulate a first data channel corresponding to a system message block; The terminal receives the first demodulation reference signal according to a first physical resource block index, and the first physical resource block index is determined according to a first position in the frequency domain; The base station transmits a second demodulation reference signal, and the second demodulation reference signal is used to demodulate a second data channel; The terminal receives the second demodulation reference signal according to a second physical resource block index, and the second physical resource block index is determined according to a second position in the frequency domain.

2. A method for data communication, characterized in that, Including: The base station transmits a first demodulation reference signal, and the first demodulation reference signal is used to demodulate a first data channel corresponding to a system message block; The terminal receives the first demodulation reference signal according to a first physical resource block index, and the first physical resource block index is determined according to a first position in the frequency domain; The terminal transmits a second demodulation reference signal according to a second physical resource block index, and the second physical resource block index is determined according to a second position in the frequency domain, and the second demodulation reference signal is used to demodulate a second data channel; The base station receives the second demodulation reference signal.

3. The method according to claim 1 or 2, characterized in that, The second data channel is not the first data channel.

4. The method according to any one of claim 1 or 2, characterized in that, The method further includes: The terminal receives a master message block, and the master message block includes first information for indicating an offset between the first position and a first frequency domain reference position.

5. The method according to claim 4, characterized in that, The first frequency domain reference position is related to the frequency domain position of a synchronization signal block.

6. The method according to any one of claim 1, 2 or 5, characterized in that, The method further includes: The terminal receives the system message block, and the system message block includes second information for indicating an offset between the second position and a second frequency domain reference position.

7. The method according to claim 6, characterized in that, The second frequency domain reference position is related to the frequency domain position of a synchronization signal block.

8. The method according to claim 5 or 7, characterized in that, The frequency domain position of the synchronization signal block is a position corresponding to one of the lowest physical resource block of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the lowest physical resource block of the synchronization signal block; or, The frequency domain position of the synchronization signal block is a position of the 0th subcarrier of the lowest physical resource block of the synchronization signal block offset by 1 / 2 subcarrier interval, a position of the 5th subcarrier offset by 1 / 2 subcarrier interval, a position of the 6th subcarrier offset by 1 / 2 subcarrier interval, or a position of the 11th subcarrier offset by 1 / 2 subcarrier interval; or, The frequency domain position of the synchronization signal block is a position corresponding to one of the central physical resource block of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the central physical resource block of the synchronization signal block; or, The frequency domain position of the synchronization signal block is a position of the 0th subcarrier of the central physical resource block of the synchronization signal block offset by 1 / 2 subcarrier interval, a position of the 5th subcarrier offset by 1 / 2 subcarrier interval, a position of the 6th subcarrier offset by 1 / 2 subcarrier interval, or a position of the 11th subcarrier offset by 1 / 2 subcarrier interval; or, The frequency domain position of the synchronization signal block is a position corresponding to one of the highest physical resource block of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the highest physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions with a subcarrier offset of 1 / 2 subcarrier spacing from the 0th subcarrier of the highest physical resource block of the synchronization signal block, the 5th subcarrier with a subcarrier offset of 1 / 2 subcarrier spacing, the 6th subcarrier with a subcarrier offset of 1 / 2 subcarrier spacing, and the 11th subcarrier with a subcarrier offset of 1 / 2 subcarrier spacing.

9. The method according to any one of claim 1, 2 or 5, characterized in that, The method further includes: The terminal receives the system message block or radio resource control signaling, and the system message block or radio resource control signaling includes second information for determining the second position.

10. The method according to any one of claim 1, 2, 5 or 7, characterized in that, The first position is the 0th subcarrier of the lowest physical resource block of the physical downlink control channel PDCCH resource, and the PDCCH resource is used to schedule the system information block.

11. The method according to any one of claim 1, 2, 5 or 7, characterized in that, The second position is the 0th subcarrier of a physical resource block.

12. The method according to any one of claims 1, 2, 5 or 7, characterized in that, The method further includes: After receiving the system message block, the terminal receives the second demodulation reference signal according to the second physical resource block index.

13. The method according to any one of claims 2, 5 or 7, characterized in that, The method further includes: After receiving the system message block, the terminal transmits the second demodulation reference signal according to the second physical resource block index.

14. The method according to any one of claims 1, 2, 5 or 7, characterized in that, The second data channel includes a terminal-specific data channel or a common downlink data channel; the first data channel is the common downlink data channel corresponding to the system message block.

15. A method for data communication, characterized in that, Including: The base station transmits a first demodulation reference signal, and the first demodulation reference signal is used to demodulate a first downlink control channel, and the first downlink control channel is used to schedule the common downlink data channel corresponding to the system message block; The terminal receives the first demodulation reference signal according to the first physical resource block index, and the first physical resource block index is determined according to the first position in the frequency domain; The base station transmits a second demodulation reference signal, and the second demodulation reference signal is used to demodulate a second downlink control channel; The terminal receives the second demodulation reference signal according to the second physical resource block index, and the second physical resource block index is determined according to the second position in the frequency domain.

16. The method according to claim 15, characterized in that, The second downlink control channel is not the first downlink control channel.

17. The method according to claim 15 or 16, characterized in that, The second downlink control channel is a common downlink control channel or a terminal-specific control channel.

18. The method according to any one of claims 15 or 16, characterized in that, The method further includes: The terminal receives a master message block, and the master message block includes first information for indicating the offset between the first position and the first frequency-domain reference position.

19. The method according to claim 18, characterized in that, The first frequency-domain reference position is related to the frequency-domain position of the synchronization signal block.

20. The method according to any one of claims 15, 16 or 19, characterized in that, The method further includes: The terminal receives the system message block, and the system message block includes second information for indicating the offset between the second position and the second frequency-domain reference position.

21. The method according to claim 20, characterized in that, The second frequency-domain reference position is related to the frequency-domain position of the synchronization signal block.

22. The method according to claim 19 or 21, characterized in that, The frequency-domain position of the synchronization signal block is the position corresponding to one of the lowest physical resource block of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the lowest physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions with a subcarrier offset of 1 / 2 subcarrier spacing from the 0th subcarrier of the lowest physical resource block of the synchronization signal block, the 5th subcarrier with a subcarrier offset of 1 / 2 subcarrier spacing, the 6th subcarrier with a subcarrier offset of 1 / 2 subcarrier spacing, and the 11th subcarrier with a subcarrier offset of 1 / 2 subcarrier spacing; or, The frequency-domain position of the synchronization signal block is the position corresponding to one of the central physical resource blocks of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the central physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions with a subcarrier offset of 1 / 2 subcarrier spacing from the 0th subcarrier of the central physical resource block of the synchronization signal block, the 5th subcarrier with a subcarrier offset of 1 / 2 subcarrier spacing, the 6th subcarrier with a subcarrier offset of 1 / 2 subcarrier spacing, and the 11th subcarrier with a subcarrier offset of 1 / 2 subcarrier spacing; or, The frequency-domain position of the synchronization signal block is the position corresponding to one of the highest physical resource blocks of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the highest physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions with a subcarrier offset of 1 / 2 subcarrier spacing from the 0th subcarrier of the highest physical resource block of the synchronization signal block, the 5th subcarrier with a subcarrier offset of 1 / 2 subcarrier spacing, the 6th subcarrier with a subcarrier offset of 1 / 2 subcarrier spacing, and the 11th subcarrier with a subcarrier offset of 1 / 2 subcarrier spacing.

23. The method according to any one of claims 15, 16 or 19, characterized in that, The method further includes: The terminal receives the system message block or radio resource control signaling, and the system message block or radio resource control signaling includes second information for determining a second position.

24. The method according to any one of claims 15, 16, 19, or 21, characterized in that, The first position is the 0th subcarrier of the lowest physical resource block of the physical downlink control channel PDCCH resource, and the PDCCH resource is used to schedule the system information block.

25. The method according to any one of claims 15, 16, 19, or 21, characterized in that, The second position is the 0th carrier of a physical resource block.

26. The method according to any one of claims 15, 16, 19, or 21, characterized in that, The method further includes: After receiving the system message block, the terminal receives the second demodulation reference signal according to the second physical resource block index.

27. The method according to any one of claims 15, 16, 19, or 21, characterized in that, The first downlink control channel is a common downlink control channel.

28. A communication system, characterized in that, Including a base station and a terminal, The base station is configured to perform the method executed by the base station in any one of claims 1 to 14; The terminal is configured to perform the method executed by the terminal in any one of claims 1 to 14.

29. A communication system, characterized in that, Including a base station and a terminal, The base station is configured to perform the method executed by the base station in any one of claims 15 to 27; The terminal is configured to perform the method executed by the terminal in any one of claims 15 to 27.

30. A method for data communication, characterized in that, Including: Receiving a primary message block, the primary message block includes first information, the first information is used to indicate a first subcarrier, the first subcarrier is the 0th subcarrier of the lowest physical resource block of the physical downlink control channel PDCCH resource, and the PDCCH resource is used to schedule the system information block; Determining a first physical resource block index according to the first subcarrier; Receive a first demodulation reference signal according to the first physical resource block index, where the first demodulation reference signal is used to demodulate the data channel where the system message block is located; Receive the system message or radio resource control signaling, where the system message or radio resource control signaling includes second information, and the second information is used to indicate a second subcarrier, and the second subcarrier is the 0th subcarrier of a physical resource block; Determine a second physical resource block index according to the second subcarrier; Transmit and / or receive a second demodulation reference signal according to the second physical resource block index, where the second demodulation reference signal is used to demodulate the data channel other than the data channel where the system message block is located.

31. The method according to claim 30, characterized in that, The method further includes: After receiving the system message block, transmit and / or receive the second demodulation reference signal according to the second physical resource block index.

32. The method according to claim 30 or 31, characterized in that, The first information is specifically used to indicate the offset between the first subcarrier and the first frequency-domain reference position.

33. The method according to claim 32, characterized in that, The first frequency-domain reference position is related to the frequency-domain position of the synchronization signal block.

34. The method according to any one of claims 30, 31, or 33, characterized in that, The second information is specifically used to indicate the offset between the second subcarrier and the second frequency-domain reference position.

35. The method according to claim 34, characterized in that, The second frequency-domain reference position is related to the frequency-domain position of the synchronization signal block.

36. The method according to claim 33 or 35, characterized in that, The frequency-domain position of the synchronization signal block is the position corresponding to one of the lowest physical resource block of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the lowest physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions where the 0th subcarrier of the lowest physical resource block of the synchronization signal block is offset by 1 / 2 subcarrier spacing, the 5th subcarrier is offset by 1 / 2 subcarrier spacing, the 6th subcarrier is offset by 1 / 2 subcarrier spacing, and the 11th subcarrier is offset by 1 / 2 subcarrier spacing; or, The frequency-domain position of the synchronization signal block is the position corresponding to one of the central physical resource block of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the central physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions where the 0th subcarrier of the central physical resource block of the synchronization signal block is offset by 1 / 2 subcarrier spacing, the 5th subcarrier is offset by 1 / 2 subcarrier spacing, the 6th subcarrier is offset by 1 / 2 subcarrier spacing, and the 11th subcarrier is offset by 1 / 2 subcarrier spacing; or, The frequency-domain position of the synchronization signal block is the position corresponding to one of the highest physical resource block of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the highest physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions where the 0th subcarrier of the highest physical resource block of the synchronization signal block is offset by 1 / 2 subcarrier spacing, the 5th subcarrier is offset by 1 / 2 subcarrier spacing, the 6th subcarrier is offset by 1 / 2 subcarrier spacing, and the 11th subcarrier is offset by 1 / 2 subcarrier spacing.

37. The method according to any one of claims 30, 31, 33 or 35, characterized in that, The data channel other than the data channel where the system message block is located includes a terminal-specific data channel or a common downlink data channel; the terminal-specific data channel includes an uplink data channel or a downlink data channel.

38. A method for data communication, characterized in that, Includes: Receive a primary message block, where the primary message block includes first information for indicating a first subcarrier, and the first subcarrier is the 0th subcarrier of the lowest physical resource block of a physical downlink control channel (PDCCH) resource, and the PDCCH resource is used to schedule a system message block; Determine a first physical resource block index according to the first subcarrier; Receive a first demodulation reference signal according to the first physical resource block index, where the first demodulation reference signal is used to demodulate a first downlink control channel, and the physical downlink control channel resource associated with the first downlink control channel is configured by a broadcast control channel; Receive the system message or radio resource control signaling, where the system message or radio resource control signaling includes second information for indicating a second subcarrier, and the second subcarrier is the 0th subcarrier of a physical resource block; Determine a second physical resource block index according to the second subcarrier; Receive a second demodulation reference signal according to the second physical resource block index, where the second demodulation reference signal is used to demodulate a downlink control channel other than the first downlink control channel.

39. The method according to claim 38, characterized in that, After establishing a connection with a base station, receive the second demodulation reference signal according to the second physical resource block index.

40. The method according to claim 38 or 39, characterized in that, The first information is used to indicate an offset between the first subcarrier and a first frequency domain reference position.

41. The method according to claim 40, characterized in that, The first frequency domain reference position is related to the frequency domain position of a synchronization signal block.

42. The method according to any one of claims 38, 39 or 41, characterized in that, The second information is used to indicate an offset between the second subcarrier and a second frequency domain reference position.

43. The method according to claim 42, characterized in that, The second frequency domain reference position is related to the frequency domain position of a synchronization signal block.

44. The method according to claim 41 or 43, characterized in that, The frequency domain position of the synchronization signal block is a position corresponding to one of the 0th, 5th, 6th, and 11th subcarriers of the lowest physical resource block of the synchronization signal block; or, The frequency domain position of the synchronization signal block is one of the positions obtained by offsetting the 0th subcarrier of the lowest physical resource block of the synchronization signal block by 1 / 2 subcarrier spacing, offsetting the 5th subcarrier by 1 / 2 subcarrier spacing, offsetting the 6th subcarrier by 1 / 2 subcarrier spacing, and offsetting the 11th subcarrier by 1 / 2 subcarrier spacing; or, The frequency domain position of the synchronization signal block is a position corresponding to one of the 0th, 5th, 6th, and 11th subcarriers of the central physical resource block of the synchronization signal block; or, The frequency domain position of the synchronization signal block is one of the positions obtained by offsetting the 0th subcarrier of the central physical resource block of the synchronization signal block by 1 / 2 subcarrier spacing, offsetting the 5th subcarrier by 1 / 2 subcarrier spacing, offsetting the 6th subcarrier by 1 / 2 subcarrier spacing, and offsetting the 11th subcarrier by 1 / 2 subcarrier spacing; or, The frequency domain position of the synchronization signal block is a position corresponding to one of the 0th, 5th, 6th, and 11th subcarriers of the highest physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions obtained by offsetting the 0th subcarrier of the highest physical resource block of the synchronization signal block by half a subcarrier spacing, the 5th subcarrier by half a subcarrier spacing, the 6th subcarrier by half a subcarrier spacing, and the 11th subcarrier by half a subcarrier spacing.

45. A data communication method, characterized in that, Transmit a primary message block, where the primary message block includes first information for indicating a first subcarrier, and the first subcarrier is the 0th subcarrier of the lowest physical resource block of the physical downlink control channel (PDCCH) resource, and the PDCCH resource is used to schedule a system information block; Transmit a first demodulation reference signal, where the first demodulation reference signal is used to demodulate the data channel where the system message block is located, and the first physical resource block index of the first demodulation reference signal is determined according to the first subcarrier; Transmit the system message or radio resource control signaling, where the system message or radio resource control signaling includes second information for indicating a second subcarrier, and the second subcarrier is the 0th subcarrier of a physical resource block; Transmit and / or receive a second demodulation reference signal, where the second demodulation reference signal is used to demodulate the data channel other than the data channel where the system message block is located, and the second physical resource block index of the second demodulation reference signal is determined according to the second subcarrier.

46. The method according to claim 45, wherein The first information is used to indicate the offset between the first subcarrier and a first frequency-domain reference position.

47. The method according to claim 46, wherein The first frequency-domain reference position is related to the frequency-domain position of the synchronization signal block.

48. The method according to any one of claims 45 to 47, wherein The second information is used to indicate the offset between the second subcarrier and a second frequency-domain reference position.

49. The method according to claim 48, wherein The second frequency-domain reference position is related to the frequency-domain position of the synchronization signal block.

50. The method according to claim 47 or 49, wherein The frequency-domain position of the synchronization signal block is the position corresponding to one of the lowest physical resource block of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the lowest physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions obtained by offsetting the 0th subcarrier of the lowest physical resource block of the synchronization signal block by half a subcarrier spacing, the 5th subcarrier by half a subcarrier spacing, the 6th subcarrier by half a subcarrier spacing, and the 11th subcarrier by half a subcarrier spacing; or, The frequency-domain position of the synchronization signal block is the position corresponding to one of the central physical resource block of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the central physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions obtained by offsetting the 0th subcarrier of the central physical resource block of the synchronization signal block by half a subcarrier spacing, the 5th subcarrier by half a subcarrier spacing, the 6th subcarrier by half a subcarrier spacing, and the 11th subcarrier by half a subcarrier spacing; or, The frequency-domain position of the synchronization signal block is the position corresponding to one of the highest physical resource block of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the highest physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions of the 0th subcarrier offset by 1 / 2 subcarrier spacing, the 5th subcarrier offset by 1 / 2 subcarrier spacing, the 6th subcarrier offset by 1 / 2 subcarrier spacing, and the 11th subcarrier offset by 1 / 2 subcarrier spacing of the highest physical resource block of the synchronization signal block.

51. The method according to any one of claims 45, 46, 47 or 49, wherein The data channel that is not the system message includes a terminal-specific data channel or a common downlink data channel; the terminal-specific data channel includes an uplink data channel or a downlink data channel.

52. A data communication method, wherein Send a primary message block, where the primary message block includes first information for indicating a first subcarrier, and the first subcarrier is the 0th subcarrier of the lowest physical resource block of the physical downlink control channel (PDCCH) resource, and the PDCCH resource is used to schedule the system message block; Send a first demodulation reference signal, where the first demodulation reference signal is used to demodulate a first downlink control channel, and the physical downlink control channel resource associated with the first downlink control channel is configured by a broadcast control channel, and the first physical resource block index of the first demodulation reference signal is determined according to the first subcarrier; Send the system message or radio resource control signaling, where the system message or radio resource control signaling includes second information for indicating a second subcarrier, and the second subcarrier is the 0th subcarrier of a physical resource block; Send a second demodulation reference signal, where the second demodulation reference signal is used to demodulate a channel other than the first downlink control channel, and the second physical resource block index of the second demodulation reference signal is determined according to the second subcarrier.

53. The method according to claim 52, wherein After establishing a connection with the terminal, send the second demodulation reference signal according to the second physical resource block index.

54. The method according to claim 52 or 53, wherein The first information is used to indicate the offset between the first subcarrier and a first frequency-domain reference position.

55. The method according to claim 54, wherein The first frequency-domain reference position is related to the frequency-domain position of the synchronization signal block.

56. The method according to claim 52, wherein The second information is used to indicate the offset between the second subcarrier and a second frequency-domain reference position.

57. The method according to claim 56, wherein The second frequency-domain reference position is related to the frequency-domain position of the synchronization signal block.

58. The method according to claim 55 or 57, wherein The frequency-domain position of the synchronization signal block is the position corresponding to one of the lowest physical resource block of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the lowest physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions of the 0th subcarrier offset by 1 / 2 subcarrier spacing, the 5th subcarrier offset by 1 / 2 subcarrier spacing, the 6th subcarrier offset by 1 / 2 subcarrier spacing, and the 11th subcarrier offset by 1 / 2 subcarrier spacing of the lowest physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is the position corresponding to one of the central physical resource block of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the central physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions of the 0th subcarrier offset by 1 / 2 subcarrier spacing, the 5th subcarrier offset by 1 / 2 subcarrier spacing, the 6th subcarrier offset by 1 / 2 subcarrier spacing, and the 11th subcarrier offset by 1 / 2 subcarrier spacing in the central physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is the position corresponding to one of the highest physical resource blocks of the synchronization signal block, the 0th, 5th, 6th, and 11th subcarriers of the highest physical resource block of the synchronization signal block; or, The frequency-domain position of the synchronization signal block is one of the positions of the 0th subcarrier offset by 1 / 2 subcarrier spacing, the 5th subcarrier offset by 1 / 2 subcarrier spacing, the 6th subcarrier offset by 1 / 2 subcarrier spacing, and the 11th subcarrier offset by 1 / 2 subcarrier spacing in the highest physical resource block of the synchronization signal block.

59. A device for data transmission, characterized in that, Comprising: A first module, configured to receive a master message block, where the master message block includes first information for indicating a first subcarrier, and the first subcarrier is the 0th subcarrier of the lowest physical resource block of a physical downlink control channel PDCCH resource, and the PDCCH resource is used to schedule a system information block; A second module, configured to determine a first physical resource block index according to the first subcarrier; A third module, configured to receive a first demodulation reference signal according to the first physical resource block index, where the first demodulation reference signal is used to demodulate the data channel where the system message block is located; A fourth module, configured to receive the system message or radio resource control signaling, where the system message or radio resource control signaling includes second information for indicating a second subcarrier, and the second subcarrier is the 0th subcarrier of a physical resource block; A fifth module, configured to determine a second physical resource block index according to the second subcarrier; A sixth module, configured to transmit and / or receive a second demodulation reference signal according to the second physical resource block index, where the second demodulation reference signal is used to demodulate a data channel other than the data channel where the system message block is located.

60. A device for data transmission, characterized in that, Comprising: A first module, configured to receive a master message block, where the master message block includes first information for indicating a first subcarrier, and the first subcarrier is the 0th subcarrier of the lowest physical resource block of a physical downlink control channel PDCCH resource, and the PDCCH resource is used to schedule a system message block; A second module, configured to determine a first physical resource block index according to the first subcarrier; A third module, configured to receive a first demodulation reference signal according to the first physical resource block index, where the first demodulation reference signal is used to demodulate a first downlink control channel, and the physical downlink control channel resource associated with the first downlink control channel is configured by a broadcast control channel; A fourth module, configured to receive the system message or radio resource control signaling, where the system message or radio resource control signaling includes second information for indicating a second subcarrier, and the second subcarrier is the 0th subcarrier of a physical resource block; The fifth module is configured to determine a second physical resource block index according to the second subcarrier; The sixth module is configured to receive a second demodulation reference signal according to the second physical resource block index, where the second demodulation reference signal is used to demodulate a non-first downlink control channel.

61. A device for data transmission, characterized in that, Comprising: A first module, configured to send a primary message block, where the primary message block includes first information, and the first information is used to indicate a first subcarrier, where the first subcarrier is the 0th subcarrier of the lowest physical resource block of a physical downlink control channel PDCCH resource, and the PDCCH resource is used to schedule a system information block; A second module, configured to send a first demodulation reference signal, where the first demodulation reference signal is used to demodulate a data channel where the system message block is located, and a first physical resource block index of the first demodulation reference signal is determined according to the first subcarrier; A third module, configured to send the system message or radio resource control signaling, where the system message or radio resource control signaling includes second information, and the second information is used to indicate a second subcarrier, where the second subcarrier is the 0th subcarrier of a physical resource block; And A fourth module, configured to send and / or receive a second demodulation reference signal, where the second demodulation reference signal is used to demodulate a data channel other than the data channel where the system message block is located, and a second physical resource block index of the second demodulation reference signal is determined according to the second subcarrier.

62. A device for data transmission, characterized in that, Comprising: A first module, configured to send a primary message block, where the primary message block includes first information, and the first information is used to indicate a first subcarrier, where the first subcarrier is the 0th subcarrier of the lowest physical resource block of a physical downlink control channel PDCCH resource, and the PDCCH resource is used to schedule a system message block; A second module, configured to send a first demodulation reference signal, where the first demodulation reference signal is used to demodulate a first downlink control channel, and a physical downlink control channel resource associated with the first downlink control channel is configured by a broadcast control channel, and a first physical resource block index of the first demodulation reference signal is determined according to the first subcarrier; A third module, configured to send the system message or radio resource control signaling, where the system message or radio resource control signaling includes second information, and the second information is used to indicate a second subcarrier, where the second subcarrier is the 0th subcarrier of a physical resource block; And A fourth module, configured to send a second demodulation reference signal, where the second demodulation reference signal is used to demodulate a non-first downlink control channel, and a second physical resource block index of the second demodulation reference signal is determined according to the second subcarrier.

63. The device according to any one of claims 59 to 62, characterized in that, The first information is specifically used to indicate an offset between the first subcarrier and a first frequency domain reference position.

64. The device according to any one of claims 59 to 62, characterized in that, The second information is specifically used to indicate an offset between the second subcarrier and a second frequency domain reference position.

65. The device according to claim 59 or 61, characterized in that, The data channel other than the data channel where the system message block is located includes a terminal-specific data channel or a common downlink data channel; the terminal-specific data channel includes an uplink data channel or a downlink data channel.

66. A device for data transmission, characterized in that, Comprising: A processor and a memory; Wherein, the memory is used to store a program; The processor is configured to execute the program stored in the memory to implement the method according to any one of claims 30 to 44.

67. A device for data transmission, characterized in that, Comprising: a processor and a memory; wherein the memory is configured to store a program; The processor is configured to execute the program stored in the memory to implement the method according to any one of claims 45 to 58.

68. A terminal, comprising the device according to any one of claims 59, 60, 63 - 65 or 66.

69. A base station, comprising the device according to any one of claims 61 - 65 or 67.

70. A computer - readable storage medium, characterized in that, The computer-readable storage medium stores a program, which when running on a computer, causes the computer to execute the method according to any one of claims 30 to 58.

71. A computer program product, characterized in that, Comprising a computer program or instruction, which when executed by a processor, implements the steps of the method according to any one of claims 30 to 58.

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