Demodulation reference signal mapping method and apparatus, communication device, and storage medium

Abstract

The application discloses a demodulation reference signal mapping method and device, communication equipment and a storage medium, and belongs to the technical field of communication. The demodulation reference signal mapping method of the application embodiment comprises the following steps: a communication equipment maps a demodulation reference signal (DMRS) according to a target mapping rule. The target mapping rule comprises the following steps: N DMRS ports are mapped on K target resource blocks (RBs) and L target orthogonal frequency division multiplexing (OFDM) symbol groups. P DMRS ports in the N DMRS ports are mapped on each target RB, and Q DMRS ports in the N DMRS ports are mapped on each target OFDM symbol group. The N DMRS ports belong to M code division multiplexing (CDM) groups. N, K, L, Q and M are all positive integers.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of communication, and particularly relates to a demodulation reference signal mapping method and device, a communication device and a storage medium. BACKGROUND

[0002] In the existing New Radio (NR) system, the demodulation reference signal (DMRS) of a data channel supports at most 12 ports, so that the number of data streams that can be simultaneously transmitted by the data channel and the number of terminals that can be multiplexed by coordinated scheduling are limited, which affects the transmission capacity of the NR system. SUMMARY

[0003] The embodiments of the present application provide a demodulation reference signal mapping method, device, communication device and storage medium, which can improve the transmission capacity of the communication system.

[0004] In a first aspect, a demodulation reference signal mapping method is provided, which comprises:

[0005] The communication device maps the demodulation reference signal (DMRS) according to a target mapping rule, and the target mapping rule comprises: mapping N DMRS ports on K target resource blocks (RBs) and L target orthogonal frequency division multiplexing (OFDM) symbol groups; wherein P DMRS ports in the N DMRS ports are mapped on each target RB, and Q DMRS ports in the N DMRS ports are mapped on each target OFDM symbol group, and the N DMRS ports belong to M code division multiplexing (CDM) groups, and N, K, L, Q and M are positive integers.

[0006] In a second aspect, a demodulation reference signal mapping device is provided, which comprises:

[0007] The mapping module is configured to map the demodulation reference signal (DMRS) according to a target mapping rule, and the target mapping rule comprises: mapping N DMRS ports on K target resource blocks (RBs) and L target orthogonal frequency division multiplexing (OFDM) symbol groups; wherein P DMRS ports in the N DMRS ports are mapped on each target RB, and Q DMRS ports in the N DMRS ports are mapped on each target OFDM symbol group, and the N DMRS ports belong to M code division multiplexing (CDM) groups, and N, K, L, Q and M are positive integers.

[0008] In a third aspect, a communication device is provided, which comprises a processor and a memory, the memory stores programs or instructions that can be run on the processor, and the programs or instructions are executed by the processor to implement the steps of the method according to the first aspect.

[0009] In a fourth aspect, a terminal is provided, comprising a processor and a communication interface, wherein the processor is configured to map demodulation reference signals (DMRS) according to a target mapping rule, the target mapping rule comprising: mapping N DMRS ports onto K target resource blocks (RBs) and L target orthogonal frequency division multiplexing (OFDM) symbol groups; wherein P DMRS ports of the N DMRS ports are mapped on each of the target RBs, and Q DMRS ports of the N DMRS ports are mapped on each of the target OFDM symbol groups, the N DMRS ports belong to M code division multiplexing (CDM) groups, and N, K, L, Q and M are positive integers.

[0010] In a fifth aspect, a network side device is provided, comprising a processor and a communication interface, wherein the processor is configured to map demodulation reference signals (DMRS) according to a target mapping rule, the target mapping rule comprising: mapping N DMRS ports onto K target resource blocks (RBs) and L target orthogonal frequency division multiplexing (OFDM) symbol groups; wherein P DMRS ports of the N DMRS ports are mapped on each of the target RBs, and Q DMRS ports of the N DMRS ports are mapped on each of the target OFDM symbol groups, the N DMRS ports belong to M code division multiplexing (CDM) groups, and N, K, L, Q and M are positive integers.

[0011] In a sixth aspect, a communication system is provided, comprising: a terminal configured to perform the steps of the demodulation reference signal mapping method according to the first aspect, and a network side device configured to perform the steps of the demodulation reference signal mapping method according to the first aspect.

[0012] In a seventh aspect, a readable storage medium is provided, the readable storage medium storing a program or instructions, the program or instructions being executed by a processor to implement the steps of the method according to the first aspect.

[0013] In an eighth aspect, a chip is provided, the chip comprising a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to run a program or instructions to implement the steps of the method according to the first aspect.

[0014] In a ninth aspect, a computer program / program product is provided, the computer program / program product being stored in a storage medium, the computer program / program product being executed by at least one processor to implement the steps of the method according to the first aspect.

[0015] In the embodiment of the present application, P DMRS ports in the N DMRS ports are mapped on each target RB, Q DMRS ports in the N DMRS ports are mapped on each target OFDM symbol group, and the N DMRS ports belong to M code division multiplexing (CDM) groups. In this way, the DMRS of the data channel can support more DMRS ports. Therefore, the embodiment of the present application can improve the transmission capacity of the communication system. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of a network structure to which the embodiment of the present application can be applied;

[0017] Figure 2 is a flowchart of a demodulation reference signal mapping method provided by the embodiment of the present application;

[0018] Figures 3a to 3d is an example diagram of mapping of each DMRS port corresponding to a mapping rule in the demodulation reference signal mapping method provided by the embodiment of the present application;

[0019] Figures 4a to 4d is an example diagram of mapping of each DMRS port corresponding to another mapping rule in the demodulation reference signal mapping method provided by the embodiment of the present application;

[0020] Figures 5a to 5f is an example diagram of mapping of each DMRS port corresponding to still another mapping rule in the demodulation reference signal mapping method provided by the embodiment of the present application;

[0021] Figures 6a to 6f is an example diagram of mapping of each DMRS port corresponding to still another mapping rule in the demodulation reference signal mapping method provided by the embodiment of the present application;

[0022] Figures 7a to 7d is an example diagram of mapping of each DMRS port corresponding to still another mapping rule in the demodulation reference signal mapping method provided by the embodiment of the present application;

[0023] Figures 8a to 8f is an example diagram of mapping of each DMRS port corresponding to still another mapping rule in the demodulation reference signal mapping method provided by the embodiment of the present application;

[0024] Figure 9 is a structural diagram of a demodulation reference signal mapping apparatus provided by the embodiment of the present application;

[0025] Figure 10 is a structural diagram of a communication device provided by the embodiment of the present application;

[0026] Figure 11 is a structural diagram of a terminal provided by the embodiment of the present application;

[0027] Figure 12 is a structural diagram of a network side device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0029] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second" are generally of a kind, and are not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the associated objects before and after.

[0030] It is worth noting that the technology described in the embodiments of the present application is not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used in the above mentioned systems and radio technologies, and also in other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to applications other than NR system applications, such as 6th Generation (6G) communication systems. th ​

[0031] Figure 1A block diagram of a wireless communication system to which embodiments of the present application can be applied is shown. The wireless communication system includes a terminal 11 and a network side device 12. The terminal 11 can be a terminal side device such as a mobile phone, a tablet personal computer, a laptop computer, a personal digital assistant (PDA), a palm computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile Internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, a vehicle-mounted device (VUE), a pedestrian terminal (PUE), a smart home (a home device with a wireless communication function such as a refrigerator, a television, a washing machine, or furniture), a game console, a personal computer (PC), a kiosk, or a self-service machine. The wearable device includes a smart watch, a smart bracelet, a smart earphone, smart glasses, smart jewelry (a smart bracelet, a smart necklace, a smart ring, a smart necklace, a smart anklet, a smart necklace, etc.), a smart wristband, and smart clothing. It should be noted that the specific type of the terminal 11 is not limited in the embodiments of the present application. The network side device 12 can include an access network device or a core network device. The access network device 12 can also be referred to as a radio access network device, a radio access network (RAN), a radio access network function, or a radio access network unit. The access network device 12 can include a base station, a WLAN access point, or a WiFi node. The base station can be referred to as a node B, an evolved node B (eNB), an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a home node B, a home evolved node B, a transmitting receiving point (TRP), or some other appropriate terminology in the art, as long as the same technical effects are achieved. The base station is not limited to a specific technical term, and it should be noted that only a base station in an NR system is taken as an example for description in the embodiments of the present application, and the specific type of the base station is not limited.The core network device can include, but is not limited to, at least one of the following: a core network node, a core network function, a mobility management entity (MME), an access and mobility management function (AMF), a session management function (SMF), a user plane function (UPF), a policy control function (PCF), a policy and charging rules function (PCRF), an edge application server discovery function (EASDF), a unified data management (UDM), a unified data repository (UDR), a home subscriber server (HSS), a centralized network configuration (CNC), a network repository function (NRF), a network exposure function (NEF), a local NEF (L-NEF), a binding support function (BSF), an application function (AF), and the like. It should be noted that only the core network device in the NR system is taken as an example for introduction in the embodiments of the present application, and the specific type of the core network device is not limited.

[0032] For the convenience of understanding, some contents related to the embodiments of the present application are described as follows:

[0033] In the current NR system, DMRS is used for channel estimation. For the DMRS of a data channel, according to the type of DMRS, it can be divided into: DMRS configuration type 1 and DMRS configuration type 2, and both DMRS configuration types support single-symbol and double-symbol structures. Among them, the single-symbol structure of DMRS configuration type 1 supports a maximum of 4 ports, and the double-symbol structure supports a maximum of 8 ports; the single-symbol structure of DMRS configuration type 2 supports a maximum of 6 ports, and the double-symbol structure supports a maximum of 12 ports. In addition, DMRS configuration type 1 supports 2 Code Division Multiplexing (CDM) groups, while DMRS configuration type 2 supports 3 CDM groups.

[0034] In the NR system, the DMRS configuration type 1 of the data channel supports a maximum of 8 ports, and the DMRS configuration type 2 supports a maximum of 12 ports, which limits the number of data streams that can be transmitted simultaneously by the data channel and the number of terminals that can be multiplexed by cooperative scheduling. Therefore, the demodulation reference signal mapping method provided in the present application is proposed.

[0035] The demodulation reference signal mapping method provided in the embodiments of the present application will be described in detail below in combination with the accompanying drawings and some embodiments and application scenarios.

[0036] Reference Figure 2 The demodulation reference signal mapping method provided in the embodiments of the present application includes:

[0037] Step 201, a communication device maps a demodulation reference signal (DMRS) according to a target mapping rule, the target mapping rule including: mapping N DMRS ports on K target resource blocks (RBs) and L target orthogonal frequency division multiplexing (OFDM) symbol groups; wherein P DMRS ports in the N DMRS ports are mapped on each target RB, and Q DMRS ports in the N DMRS ports are mapped on each target OFDM symbol group, the N DMRS ports belong to M code division multiplexing (CDM) groups, and N, K, L, Q and M are positive integers.

[0038] In the embodiments of the present application, the target OFDM symbol group includes one or two OFDM symbols. For example, in some embodiments, the target OFDM symbol group satisfies at least one of the following:

[0039] When the DMRS is a single-symbol structure, the target OFDM symbol group contains 1 OFDM symbol;

[0040] When the DMRS is of a double-symbol structure, the target OFDM symbol group contains 2 consecutive OFDM symbols.

[0041] It should be understood that the communication device described above can be understood as a network-side device or a terminal. The P DMRS ports described above can be understood as part or all of the N DMRS ports, and the Q DMRS ports described above can be understood as part or all of the N DMRS ports.

[0042] In the embodiments of the present application, P DMRS ports of the N DMRS ports are mapped on each of the target RBs, Q DMRS ports of the N DMRS ports are mapped on each of the target OFDM symbol groups, and the N DMRS ports belong to M code division multiplexing (CDM) groups. In this way, the DMRS of the data channel can support more DMRS ports. Therefore, the embodiments of the present application can improve the transmission capacity of the communication system.

[0043] Optionally, in some embodiments, the OFDM symbols of the L OFDM symbol groups, except for the OFDM symbol group where the front-load OFDM symbol is located, are located at additional positions of the DMRS.

[0044] Optionally, in some embodiments, the value of M satisfies at least one of the following:

[0045] When the type of the DMRS is a first configuration type, M is equal to 2 or 4;

[0046] When the type of the DMRS is a second configuration type, M is equal to 3 or 6.

[0047] Optionally, in some embodiments, when Q=N and the N DMRS ports are mapped with a granularity of G RBs, the value of P satisfies any of the following: P=N;

[0048] wherein G is an even number greater than 0.

[0049] In the embodiments of the present application, the value of G can be consistent with the value of a precoding resource block group (PRG). Specifically, the value of G can be agreed by default by the network-side device and the terminal, or can be indicated by signaling, without further limitation here.

[0050] Optionally, in some embodiments, when P=N and the type of the DMRS is a first configuration type, the target mapping rule further comprises:

[0051] On each OFDM symbol in the target OFDM symbol group, each DMRS port is mapped with 6 first resource elements (REs) in two consecutive target RBs as a basic mapping unit.

[0052] In the embodiments of the present application, on each OFDM symbol in the target OFDM symbol group, each DMRS port occupies 6 first REs in two consecutive target RBs. The first configuration type can be understood as a DMRS configuration type associated with DMRS configuration type 1, for example, the first configuration type can be DMRS configuration type 1 or enhanced DMRS configuration type 1.

[0053] Optionally, in some embodiments, 4 first REs in the 6 first REs are located in one target RB of the 2 target RBs, and the remaining 2 first REs in the 6 first REs are located in the other target RB.

[0054] Optionally, in some embodiments, the subcarrier spacing between the 6 first REs satisfies at least one of the following:

[0055] The subcarrier spacing between the first 2 first REs in the 4 first REs is 1 RE, and the subcarrier spacing between the last 2 first REs is 1 RE.

[0056] The subcarrier spacing between the last first RE in the first 2 first REs in the 4 first REs and the first first RE in the last 2 first REs in the 4 first REs is 6 REs.

[0057] The subcarrier spacing between the remaining 2 first REs is 1 RE.

[0058] In the embodiments of the present application, when the DMRS is a single-symbol structure: the DMRS can support a maximum of 8 DMRS ports, as shown in the following table. Figures 3a to 3d

[0059] It should be understood that the CDM grouping of 8 DMRS ports can be set according to actual needs, and different CDM grouping cases are described below.

[0060] Case 1: 8 DMRS ports belong to 4 CDM groups respectively, and each CDM group includes 2 DMRS ports.

[0061] ​For example, the first DMRS port and the second DMRS port belong to the first CDM group; the third DMRS port and the fourth DMRS port belong to the second CDM group; the fifth DMRS port and the sixth DMRS port belong to the third CDM group; and the seventh DMRS port and the eighth DMRS port belong to the fourth CDM group.

[0062] In the same CDM group, the DMRS ports are CDM multiplexed by a length-2 Frequency Division-Orthogonal Cover Code (FD-OCC) sequence, which acts on two adjacent subcarriers, for example, the first DMRS port on subcarriers 0 and 2, subcarriers 8 and 10 on RB1, and subcarriers 4 and 6 on RB2.

[0063] Case 2: 8 DMRS ports belong to 2 CDM groups respectively, and each CDM group contains 4 DMRS ports.

[0064] For example, the first DMRS port, the second DMRS port, the third DMRS port, and the fourth DMRS port belong to the first CDM group; the fifth DMRS port, the sixth DMRS port, the seventh DMRS port, and the eighth DMRS port belong to the second CDM group.

[0065] In the same CDM group, part of the DMRS ports are CDM multiplexed by a length-2 FD-OCC sequence (for example, the first DMRS port and the second DMRS port; the third DMRS port and the fourth DMRS port; and the like), and part of the DMRS ports in the same CDM group are FDM multiplexed (for example, the first DMRS port and the third DMRS port; the second DMRS port and the fourth DMRS port; and the like). The length-2 FD-OCC sequence acts on two adjacent subcarriers.

[0066] Optionally, when the DMRS is a double-symbol structure: the port mapping manner of the DMRS is similar to that of the single-symbol structure, but a length-2 Time Division-Orthogonal Cover Code (TD-OCC) sequence is additionally introduced to act on two consecutive OFDM symbols in the DMRS symbol group on the basis of the single-symbol structure. At this time, a maximum of 16 DMRS ports can be supported, which belong to 4 CDM groups respectively, and each CDM group contains 4 DMRS ports. Alternatively, they belong to 2 CDM groups respectively, and each CDM group contains 8 DMRS ports.

[0067] Optionally, in some embodiments, in and the type of the DMRS is the first configuration type, the target mapping rule further comprises:

[0068] On each OFDM symbol in the target OFDM symbol group, each DMRS port is mapped in a basic mapping unit of 6 second REs in one of the two continuous target RBs, and the subcarrier spacing between adjacent two second REs is 1 RE.

[0069] In the embodiments of the present application, on each OFDM symbol in the target OFDM symbol group, each DMRS port occupies 6 second REs in one of the two continuous target RBs, and the subcarrier spacing between the 6 second REs is 1 RE.

[0070] In the embodiments of the present application, when the DMRS is a single-symbol structure, the maximum number of DMRS ports supported by the DMRS is 8, as shown in the following table. Figures 4a to 4d

[0071] It should be understood that the CDM grouping of 8 DMRS ports can be set according to actual needs, and different CDM grouping cases are described below.

[0072] Case 1: 8 DMRS ports belong to 4 CDM groups respectively, and each CDM group includes 2 DMRS ports.

[0073] For example, the first DMRS port and the second DMRS port belong to the first CDM group; the third DMRS port and the fourth DMRS port belong to the second CDM group; the fifth DMRS port and the sixth DMRS port belong to the third CDM group; and the seventh DMRS port and the eighth DMRS port belong to the fourth CDM group.

[0074] Among them, the DMRS ports in the same CDM group are CDM multiplexed by a length-2 FD-OCC sequence, and the length-2 FD-OCC sequence acts on adjacent two subcarriers, for example, the first DMRS port is on subcarriers 0 and 2, subcarriers 4 and 6, and subcarriers 8 and 10 in RB1.

[0075] Case 2: 8 DMRS ports belong to 2 CDM groups respectively, and each CDM group includes 4 DMRS ports.

[0076] For example, the first DMRS port, the second DMRS port, the fifth DMRS port and the sixth DMRS port belong to the first CDM group; the third DMRS port, the fourth DMRS port, the seventh DMRS port and the eighth DMRS port belong to the second CDM group.

[0077] ​The part of the DMRS ports in the same CDM group are CDM multiplexed by a length-2 FD-OCC sequence (for example, the first DMRS port and the second DMRS port; the fifth DMRS port and the sixth DMRS port; and the like), and the part of the DMRS ports in the same CDM group are FDM multiplexed (for example, the first DMRS port and the fifth DMRS port; the second DMRS port and the sixth DMRS port; and the like). The length-2 FD-OCC sequence acts on two adjacent subcarriers.

[0078] It should be noted that when the DMRS is of a double-symbol structure: the port mapping manner of the DMRS is similar to that of the single-symbol structure, but a length-2 TD-OCC sequence additionally acts on two consecutive OFDM symbols in a DMRS symbol group on the basis of the single-symbol structure. At this time, a maximum of 16 DMRS ports can be supported, and the 16 DMRS ports belong to 4 CDM groups respectively, wherein each CDM group includes 4 DMRS ports. Alternatively, the 16 DMRS ports belong to 2 CDM groups respectively, wherein each CDM group includes 8 DMRS ports.

[0079] Optionally, in some embodiments, in a case where the DMRS is of the single-symbol structure and the type of the DMRS is the first configuration type, the target mapping rule further includes: and in a case where the type of the DMRS is the second configuration type, the target mapping rule further includes:

[0080] On each OFDM symbol in the target OFDM symbol group, each DMRS port is mapped as a basic mapping unit of 4 third REs in one of the two consecutive target RBs.

[0081] In the embodiments of the present application, on each OFDM symbol in the target OFDM symbol group, each DMRS port occupies 4 third REs in one of the two consecutive target RBs. The above-mentioned second configuration type can be understood as a DMRS configuration type associated with a DMRS configuration type 2, for example, the second configuration type can be a DMRS configuration type 2 or an enhanced DMRS configuration type 2.

[0082] Optionally, the subcarrier spacing of the third RE satisfies at least one of the following:

[0083] The subcarriers of the first two third REs in the 4 third REs are adjacent, and the subcarriers of the last two third REs are adjacent.

[0084] The subcarrier of the last third RE in the first two third REs and the first third RE between the last two third REs in the 4 third REs is 4 REs.

[0085] In the embodiments of the present application, when the DMRS is of a single-symbol structure: a maximum of 12 DMRS ports can be supported for the DMRS, and the 12 DMRS ports are specifically as follows: Figures 5a to 5fas shown.

[0086] It should be understood that the CDM grouping of 12 DMRS ports can be set according to actual needs, and different CDM grouping cases are described below.

[0087] Case 1: 12 DMRS ports belong to 6 CDM groups respectively, and each CDM group includes 2 DMRS ports.

[0088] For example, the first DMRS port and the second DMRS port belong to the first CDM group; the third DMRS port and the fourth DMRS port belong to the second CDM group; the fifth DMRS port and the sixth DMRS port belong to the third CDM group; the seventh DMRS port and the eighth DMRS port belong to the fourth CDM group; the ninth DMRS port and the tenth DMRS port belong to the fifth CDM group; and the eleventh DMRS port and the twelfth DMRS port belong to the sixth CDM group.

[0089] Among them, the DMRS ports in the same CDM group are CDM multiplexed by a length-2 FD-OCC sequence, and the length-2 FD-OCC sequence acts on two adjacent subcarriers, for example, the first DMRS port is on subcarriers 0 and 1 of RB1.

[0090] Case 2: 12 DMRS ports belong to 3 CDM groups respectively, and each CDM group includes 4 DMRS ports.

[0091] For example, the first DMRS port, the second DMRS port, the seventh DMRS port and the eighth DMRS port belong to the first CDM group; the third DMRS port, the fourth DMRS port, the ninth DMRS port and the tenth DMRS port belong to the second CDM group; and the fifth DMRS port, the sixth DMRS port, the eleventh DMRS port and the twelfth DMRS port belong to the third CDM group.

[0092] Among them, part of the DMRS ports in the same CDM group are CDM multiplexed by a length-2 FD-OCC sequence (such as the first DMRS port and the second DMRS port; the seventh DMRS port and the eighth DMRS port); and part of the DMRS ports in the same CDM group are FDM multiplexed. The length-2 FD-OCC sequence acts on two adjacent subcarriers.

[0093] It should be noted that when the DMRS is a double-symbol structure: the port mapping manner of the DMRS is similar to that of the single-symbol structure, but a length-2 TD-OCC sequence is additionally introduced to act on the two consecutive OFDM symbols in the DMRS symbol group on the basis of the single-symbol structure. At this time, a maximum of 24 DMRS ports can be supported, which belong to 6 CDM groups respectively, wherein each CDM group includes 4 DMRS ports. Alternatively, they belong to 3 CDM groups respectively, wherein each CDM group includes 8 DMRS ports.

[0094] Optionally, in some embodiments, in the case of Q=N, P=N, and the type of the DMRS interface being the second configuration type, the target mapping rule further includes any one of the following:

[0095] The M CDM groups are located in one of the two consecutive target RBs, and the other CDM groups are located in the other target RB.

[0096] The M CDM groups are located in each of the target RBs.

[0097] Optionally, in some embodiments, in the case of Q=N, P=N, and the type of the DMRS interface being the second configuration type, the target mapping rule further includes any one of the following:

[0098] On each OFDM symbol in the target OFDM symbol group, each DMRS port is mapped as a basic mapping unit of 2 fourth REs in one target RB, and the subcarriers of the 2 fourth REs are adjacent.

[0099] In the embodiments of the present application, on each OFDM symbol in the target OFDM symbol group, each DMRS port occupies 2 fourth REs in one target RB, and the subcarriers of the 2 fourth REs are adjacent.

[0100] In the embodiments of the present application, when the DMRS is a single-symbol structure: the DMRS can support a maximum of 12 DMRS ports, as shown in Figures 6a to 6f

[0101] It should be understood that the CDM grouping of the 12 DMRS ports can be set according to actual needs, and different CDM grouping cases are described below.

[0102] Case 1: The 12 DMRS ports belong to 6 CDM groups respectively, and each CDM group includes 2 DMRS ports.

[0103] ​​​For example, the first DMRS port and the second DMRS port belong to the first CDM group; the third DMRS port and the fourth DMRS port belong to the second CDM group; the fifth DMRS port and the sixth DMRS port belong to the third CDM group; the seventh DMRS port and the eighth DMRS port belong to the fourth CDM group; the ninth DMRS port and the tenth DMRS port belong to the fifth CDM group; and the eleventh DMRS port and the twelfth DMRS port belong to the sixth CDM group.

[0104] In the same CDM group, the DMRS ports are CDM multiplexed by a length-2 FD-OCC sequence, where the length-2 FD-OCC sequence acts on two adjacent subcarriers, for example, the first DMRS port on subcarriers 0 and 1 of RB1.

[0105] Case 2: 12 DMRS ports belong to 3 CDM groups respectively, and each CDM group includes 4 DMRS ports.

[0106] In the same CDM group, part of the DMRS ports are CDM multiplexed by a length-2 FD-OCC sequence (for example, the first DMRS port and the second DMRS port; the seventh DMRS port and the eighth DMRS port); and part of the DMRS ports in the same CDM group are FDM multiplexed. The length-2 FD-OCC sequence acts on two adjacent subcarriers.

[0107] It should be noted that when the DMRS is a double-symbol structure: the port mapping manner of the DMRS is similar to that of the single-symbol structure, but a length-2 TD-OCC sequence is additionally introduced to act on two consecutive OFDM symbols in the DMRS symbol group on the basis of the single-symbol structure. At this time, a maximum of 24 DMRS ports can be supported, which belong to 6 CDM groups respectively, where each CDM group includes 4 DMRS ports. Alternatively, they belong to 3 CDM groups respectively, where each CDM group includes 8 DMRS ports.

[0108] Optionally, in some embodiments, when L is greater than 1 and P=N, the value of Q satisfies any one of the following:

[0109] Optionally, the target mapping rule further includes at least one of the following:

[0110] When the type of the DMRS is the first configuration type, on each OFDM symbol in the target OFDM symbol group, each DMRS port is mapped as a basic mapping unit of 6 fifth REs in one target RB;

[0111] When the type of the DMRS is the second configuration type, each DMRS port is mapped with 4 sixth REs in one of the target RBs as a basic mapping unit on each OFDM symbol in the target OFDM symbol group.

[0112] Optionally, in some embodiments, the subcarrier spacing between adjacent fifth REs is one RE.

[0113] Optionally, in some embodiments, the subcarrier spacing between the 4 sixth REs satisfies at least one of the following:

[0114] The subcarriers of the first 2 sixth REs in the 4 sixth REs are adjacent, and the subcarriers of the last 2 sixth REs are adjacent.

[0115] The subcarrier spacing between the last sixth RE in the first 2 sixth REs and the first sixth RE in the last 2 sixth REs in the 4 sixth REs is 4 REs.

[0116] In the embodiments of the present application, as shown in Figures 7a to 7d When the type of the DMRS is the first configuration type, when the DMRS is a single-symbol structure, the maximum number of DMRS ports that can be supported is 8. In the embodiments, the first DMRS port, the second DMRS port, the third DMRS port, and the fourth DMRS port are located on the third OFDM symbol, and the fifth DMRS port, the sixth DMRS port, the seventh DMRS port, and the eighth DMRS port are located on the eighth OFDM symbol.

[0117] It should be understood that the CDM grouping of the 8 DMRS ports can be set according to actual needs, and different CDM grouping cases are described below.

[0118] Case 1: The 8 DMRS ports belong to 4 CDM groups respectively, and each CDM group contains 2 DMRS ports.

[0119] For example, the first DMRS port and the second DMRS port belong to the first CDM group; the third DMRS port and the fourth DMRS port belong to the second CDM group; the fifth DMRS port and the sixth DMRS port belong to the third CDM group; and the seventh DMRS port and the eighth DMRS port belong to the fourth CDM group.

[0120] Among them, the DMRS ports in the same CDM group are CDM multiplexed with a length-2 FD-OCC sequence, and the length-2 FD-OCC sequence acts on adjacent two subcarriers, for example, the first DMRS port is on subcarriers 0 and 2, subcarriers 4 and 6, and subcarriers 8 and 10 on RB1.

[0121] Case 1: 8 DMRS ports belong to 2 CDM groups respectively, and each CDM group contains 4 DMRS ports.

[0122] In the same CDM group, part of the DMRS ports are CDM multiplexed by a length-2 FD-OCC sequence (such as the first DMRS port and the second DMRS port; the fifth DMRS port and the sixth DMRS port, etc.), and part of the DMRS ports in the same CDM group are TDM multiplexed. The length-2 FD-OCC sequence acts on two adjacent subcarriers.

[0123] It should be noted that when the DMRS is a double-symbol structure: the port mapping manner of the DMRS is similar to that of the single-symbol structure, but a length-2 TD-OCC sequence is additionally introduced to act on two consecutive OFDM symbols in the DMRS symbol group on the basis of the single-symbol structure. At this time, a maximum of 16 DMRS ports can be supported, which belong to 4 CDM groups respectively, and each CDM group contains 4 DMRS ports. Alternatively, they belong to 2 CDM groups respectively, and each CDM group contains 8 DMRS ports.

[0124] In the embodiment of the present application, as shown in the following table, when the type of the DMRS is the second configuration type, when the DMRS is a single-symbol structure: Figures 8a to 8f The maximum of 12 DMRS ports can be supported.

[0125] It should be understood that the CDM grouping of 12 DMRS ports can be set according to actual needs, and different CDM grouping cases are described below.

[0126] Case 1: 12 DMRS ports belong to 6 CDM groups respectively, and each CDM group contains 2 DMRS ports.

[0127] For example, the first DMRS port and the second DMRS port belong to the first CDM group; the third DMRS port and the fourth DMRS port belong to the second CDM group; the fifth DMRS port and the sixth DMRS port belong to the third CDM group; the seventh DMRS port and the eighth DMRS port belong to the fourth CDM group; the ninth DMRS port and the tenth DMRS port belong to the fifth CDM group; and the eleventh DMRS port and the twelfth DMRS port belong to the sixth CDM group.

[0128] In the same CDM group, the DMRS ports are CDM multiplexed by a length-2 FD-OCC sequence, and the length-2 FD-OCC sequence acts on two adjacent subcarriers, for example, the first DMRS port on the subcarriers 0 and 1 of the RB1.

[0129] Case 2: 12 DMRS ports belong to 3 CDM groups respectively, and each CDM group includes 4 DMRS ports.

[0130] Wherein, part of the DMRS ports in the same CDM group are CDM multiplexed by the length-2 FD-OCC sequence (such as the first DMRS port and the second DMRS port; the seventh DMRS port and the eighth DMRS port); and part of the DMRS ports in the same CDM group are FDM multiplexed. The length-2 FD-OCC sequence acts on two adjacent subcarriers.

[0131] It should be noted that when the DMRS is a double-symbol structure: the port mapping manner of the DMRS is similar to that of the single-symbol structure, but a length-2 TD-OCC sequence is additionally introduced to act on the consecutive two OFDM symbols in the DMRS symbol group on the basis of the single-symbol structure. At this time, a maximum of 24 DMRS ports can be supported, and belong to 6 CDM groups respectively, wherein each CDM group includes 4 DMRS ports. Alternatively, belong to 3 CDM groups respectively, wherein each CDM group includes 8 DMRS ports.

[0132] It should be understood that in the embodiments of the present application, the index value of each DMRS port in the first DMRS port to the twenty-fourth DMRS port can be set according to actual needs, for example, the first DMRS port can be the first DMRS port, the last DMRS port, or any intermediate DMRS port, wherein the first DMRS port can be DMRS port 0 (i.e., the index of the DMRS port is numbered from 0).

[0133] Optionally, in some embodiments, the CDM groups satisfy at least one of the following:

[0134] Each CDM group includes Y DMRS ports, Y is a positive integer, and

[0135] The DMRS ports in the same CDM group are multiplexed by the length-2 FD-OCC sequence, or the length-2 FD-OCC sequence and the length-2 TD-OCC sequence.

[0136] In the embodiments of the present application, when the DMRS is a single-symbol structure, the DMRS ports in the same CDM group are multiplexed by the length-2 FD-OCC sequence; when the DMRS is a double-symbol structure, the DMRS ports in the same CDM group are multiplexed by the length-2 FD-OCC sequence and the length-2 TD-OCC sequence.

[0137] Optionally, in some embodiments, the CDM groups satisfy at least one of the following:

[0138] Each CDM group includes Y DMRS ports, where Y is a positive integer, and

[0139] DMRS ports in the same CDM group use FD-OCC sequences of length 2, or multiplex FD-OCC sequences of length 2 and TD-OCC sequences of length 2.

[0140] Optionally, when the N DMRS ports are mapped at a granularity of G RBs, the target bandwidth corresponding to the data channel scheduled by the network-side device for the terminal satisfies at least one of the following:

[0141] The target bandwidth includes a number of RBs that are multiples of G, where G is an even number greater than 0;

[0142] The bundle parameters associated with the target bandwidth are defined by the protocol, and the bundle parameters correspond to G RBs as granularity;

[0143] The target bandwidth is divided into M bundled units according to the bundle parameters, wherein the rule for the division is based on reference point A as the starting position;

[0144] When frequency hopping is used in the data channel, the resource bandwidth corresponding to each hop is a multiple of G, or the starting position of the resource bandwidth corresponding to each hop is the starting position of each bundled unit that is divided into blocks by bundle parameters.

[0145] In this embodiment of the application, the above-mentioned binding unit can be understood or replaced as a bundle unit, and the above-mentioned reference point A can be referred to as Point A.

[0146] It should be noted that the block division rule, which starts from reference point A, can be understood as the same as the block division rule of PRGbundling.

[0147] Optionally, in some embodiments, when the N DMRS ports are mapped with G RBs as the granularity, the difference in the starting position of the scheduling resource bandwidth corresponding to each of the multiple terminals in the coordinated scheduling is a multiple of G or 0, where G is an even number greater than 0.

[0148] In this embodiment of the application, the multiple terminals that are coordinated and scheduled can be referred to as multi-user multiple-input multiple-output (MU-MIMO) multiplexed terminals.

[0149] The embodiment of the present application provides a demodulation reference signal mapping method, and the execution subject can be a demodulation reference signal mapping device. The embodiment of the present application takes the demodulation reference signal mapping device as an example to execute the demodulation reference signal mapping method, and the demodulation reference signal mapping device is described.

[0150] As shown in the figure, Figure 9 The embodiment of the present application provides a demodulation reference signal mapping device 900, which comprises:

[0151] The mapping module 901 is configured to map the demodulation reference signal DMRS according to a target mapping rule, and the target mapping rule comprises: mapping N DMRS ports on K target resource blocks RBs and L target orthogonal frequency division multiplexing OFDM symbol groups; wherein P DMRS ports in the N DMRS ports are mapped on each target RB, and Q DMRS ports in the N DMRS ports are mapped on each target OFDM symbol group, the N DMRS ports belong to M code division multiplexing CDM groups, and N, K, L, Q and M are positive integers.

[0152] Optionally, in the case that Q=N and the N DMRS ports are mapped with G RBs as granularity, the value of P satisfies any one of the following conditions: P=N;

[0153] Wherein, G is an even number greater than 0.

[0154] Optionally, in the case that P=N and the type of DMRS is a first configuration type, the target mapping rule further comprises:

[0155] On each OFDM symbol in the target OFDM symbol group, each DMRS port is mapped with 6 first resource elements REs in two continuous target RBs as a basic mapping unit.

[0156] Optionally, 4 first REs in the 6 first REs are located in one target RB in the two target RBs, and the remaining 2 first REs in the 6 first REs are located in the other target RB.

[0157] Optionally, the subcarrier spacing between the 6 first REs satisfies at least one of the following conditions:

[0158] The subcarrier spacing between the first 2 first REs in the 4 first REs is 1 RE, and the subcarrier spacing between the last 2 first REs is 1 RE;

[0159] The subcarrier spacing between the last first RE in the first 2 first REs in the 4 first REs and the first first RE in the last 2 first REs in the 4 first REs is 6 REs.

[0160] The subcarrier spacing between the remaining 2 first REs is 1 RE.

[0161] Optionally, in a case where and the type of the DMRS is the first configuration type, the target mapping rule further comprises:

[0162] On each OFDM symbol in the target OFDM symbol group, each DMRS port is mapped with 6 second REs in one of the two continuous target RBs as a basic mapping unit, wherein the subcarrier spacing between adjacent two second REs is 1 RE.

[0163] Optionally, in a case where and the type of the DMRS is the second configuration type, the target mapping rule further comprises:

[0164] On each OFDM symbol in the target OFDM symbol group, each DMRS port is mapped with 4 third REs in one of the two continuous target RBs as a basic mapping unit.

[0165] Optionally, the subcarrier spacing of the third RE satisfies at least one of the following:

[0166] The subcarriers of the first two third REs in the 4 third REs are adjacent, and the subcarriers of the last two third REs are adjacent.

[0167] The subcarriers of the last one of the first two third REs and the first one of the last two third REs in the 4 third REs are 4 REs.

[0168] Optionally, in a case where , the target mapping rule further comprises any one of the following:

[0169] The M CDM groups are located in one of the two continuous target RBs, and the other CDM groups are located in the other target RB. The M CDM groups are located in each of the target RBs.

[0170] Optionally, in a case where Q=N, P=N, and the type of the DMRS interface is the second configuration type, the target mapping rule further comprises:

[0171]

[0172] ​Each DMRS port is mapped with 2 fourth REs in one of the target RBs as a basic mapping unit on each OFDM symbol in the target OFDM symbol group, and the 2 fourth REs are adjacent in subcarriers.

[0173] Optionally, in the case that L is greater than 1 and P = N, the value of Q satisfies any one of the following:

[0174] Optionally, the target mapping rule further comprises at least one of the following:

[0175] When the type of the DMRS is the first configuration type, each DMRS port is mapped with 6 fifth REs in one of the target RBs as a basic mapping unit on each OFDM symbol in the target OFDM symbol group;

[0176] When the type of the DMRS is the second configuration type, each DMRS port is mapped with 4 sixth REs in one of the target RBs as a basic mapping unit on each OFDM symbol in the target OFDM symbol group.

[0177] Optionally, the subcarrier spacing between adjacent fifth REs is one RE.

[0178] Optionally, the subcarrier spacing between the 4 sixth REs satisfies at least one of the following:

[0179] The first 2 sixth REs of the 4 sixth REs are adjacent in subcarriers, and the last 2 sixth REs are adjacent in subcarriers;

[0180] The subcarrier spacing between the last sixth RE of the first 2 sixth REs of the 4 sixth REs and the first sixth RE of the last 2 sixth REs of the 4 sixth REs is 4 REs.

[0181] Optionally, except for the OFDM symbol group where the front OFDM symbol is located, the OFDM symbols of other OFDM symbol groups in the L OFDM symbol groups are located at additional positions of the DMRS.

[0182] Optionally, the value of M satisfies at least one of the following:

[0183] When the type of the DMRS is the first configuration type, M is equal to 2 or 4;

[0184] When the type of the DMRS is the second configuration type, M is equal to 3 or 6.

[0185] Optionally, the target OFDM symbol group satisfies at least one of the following:

[0186] When the DMRS is a single-symbol structure, the target OFDM symbol group contains 1 OFDM symbol;

[0187] When the DMRS is a double-symbol structure, the target OFDM symbol group contains 2 consecutive OFDM symbols.

[0188] Optionally, the CDM groups satisfy at least one of the following conditions:

[0189] Each CDM group includes Y DMRS ports, Y being a positive integer, and

[0190] The DMRS ports in the same CDM group use a frequency division orthogonal cover code sequence with a length of 2, or use a frequency division orthogonal cover code sequence with a length of 2 and a time division orthogonal cover code sequence with a length of 2 for multiplexing.

[0191] Optionally, in the case where the N DMRS ports are mapped with G RBs as granularity, the target bandwidth corresponding to the data channel scheduled by the network side device for the terminal satisfies at least one of the following conditions:

[0192] The number of RBs contained in the target bandwidth is a multiple of G, G being an even number greater than 0;

[0193] The bundle parameter associated with the target bandwidth is agreed by a protocol, and the bundle parameter corresponds to G RBs as granularity;

[0194] The target bandwidth is divided into M bundle units according to the bundle parameter, wherein the division rule takes a reference point A as a starting position;

[0195] In the case where the data channel uses frequency hopping, the resource bandwidth corresponding to each hop is a multiple of G, or the starting position of the resource bandwidth corresponding to each hop is the starting position of each bundle unit divided by the bundle parameter.

[0196] Optionally, in the case where the N DMRS ports are mapped with G RBs as granularity, the difference between the starting positions of the scheduling resource bandwidths corresponding to the multiple terminals scheduled in cooperation is a multiple of G or 0, G being an even number greater than 0.

[0197] In the embodiments of the present application, P DMRS ports in the N DMRS ports are mapped on each target RB, Q DMRS ports in the N DMRS ports are mapped on each target OFDM symbol group, and the N DMRS ports belong to M code division multiplexing (CDM) groups. In this way, the DMRS of the data channel can support more DMRS ports. Therefore, the embodiments of the present application can improve the transmission capacity of the communication system.

[0198] The demodulation reference signal mapping apparatus in the embodiments of the present application can be an electronic device, for example, an electronic device with an operating system, or a component in an electronic device, for example, an integrated circuit or a chip. The electronic device can be a terminal or other device than a terminal. Exemplarily, the terminal can include, but is not limited to, the types of the terminal 11 listed above, and the other device can be a server, a network attached storage (NAS), etc., which are not limited in the embodiments of the present application.

[0199] The demodulation reference signal mapping apparatus provided in the embodiments of the present application can implement the method embodiments and achieve the same technical effects. Figure 2 The method embodiments implement various processes and achieve the same technical effects, and thus details are not repeated here.

[0200] Optionally, as shown in Figure 10 the embodiments of the present application also provide a communication device 1000, which includes a processor 1001 and a memory 1002, and the memory 1002 stores programs or instructions executable on the processor 1001. For example, when the communication device 1000 is a terminal, the programs or instructions are executed by the processor 1001 to implement the various steps of the above-described demodulation reference signal mapping method embodiments and achieve the same technical effects. When the communication device 1000 is a network side device, the programs or instructions are executed by the processor 1001 to implement the various steps of the above-described demodulation reference signal mapping method embodiments and achieve the same technical effects. Details are not repeated here to avoid repetition.

[0201] The embodiments of the present application also provide a terminal, which includes a processor and a communication interface, and the processor is configured to map a demodulation reference signal (DMRS) according to a target mapping rule. The target mapping rule includes: mapping N DMRS ports on K target resource blocks (RBs) and L target orthogonal frequency division multiplexing (OFDM) symbol groups; wherein P DMRS ports in the N DMRS ports are mapped on each target RB, and Q DMRS ports in the N DMRS ports are mapped on each target OFDM symbol group, and the N DMRS ports belong to M code division multiplexing (CDM) groups, and N, K, L, Q and M are positive integers. The terminal embodiment corresponds to the above-described method embodiment, and each implementation process and implementation manner of the above-described method embodiment can be applied to the terminal embodiment and achieve the same technical effects. Specifically, Figure 11 A hardware structure diagram of a terminal for implementing the embodiments of the present application.

[0202] The terminal 1100 includes, but is not limited to, at least part of components such as a radio frequency unit 1101, a network module 1102, an audio output unit 1103, an input unit 1104, a sensor 1105, a display unit 1106, a user input unit 1107, an interface unit 1108, a memory 1109, and a processor 1110.

[0203] Those skilled in the art can understand that the terminal 1100 can further include a power supply (such as a battery) for supplying power to each component, and the power supply can be logically connected to the processor 1110 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. Figure 11 The terminal structure shown in the figure does not constitute a limitation on the terminal, and the terminal can include more or fewer components than those shown, or combine certain components, or different component arrangements, which are not described here.

[0204] It should be understood that in the embodiments of the present application, the input unit 1104 can include a graphics processing unit (GPU) 11041 and a microphone 11042. The graphics processor 11041 processes image data of a still picture or a video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 1106 can include a display panel 11061, which can be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 1107 includes at least one of a touch panel 11071 and other input devices 11072. The touch panel 11071 is also called a touch screen. The touch panel 11071 can include two parts of a touch detection device and a touch controller. The other input devices 11072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), trackballs, mice, joysticks, etc., which are not described here.

[0205] In the embodiments of the present application, the radio frequency unit 1101 can transmit the downlink data received from the network side device to the processor 1110 for processing. In addition, the radio frequency unit 1101 can send uplink data to the network side device. Generally, the radio frequency unit 1101 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0206] The memory 1109 can be used to store software programs or instructions and various data. The memory 1109 can mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area can store an operating system, at least one application program or instruction required by a function (such as a sound playing function, an image playing function, etc.), and the like. In addition, the memory 1109 can include a volatile memory or a non-volatile memory, or the memory 1109 can include both volatile and non-volatile memories. The non-volatile memory can be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically EPROM (EEPROM), or a flash memory. The volatile memory can be a Random Access Memory (RAM), a Static RAM (SRAM), a Dynamic RAM (DRAM), a Synchronous DRAM (SDRAM), a Double Data Rate SDRAM (DDR SDRAM), an Enhanced SDRAM (ESDRAM), a Synch link DRAM (SLDRAM), and a Direct Rambus RAM (DRRAM). The memory 1109 in the embodiments of the present application includes but is not limited to these and any other suitable types of memories.

[0207] The processor 1110 can include one or more processing units; optionally, the processor 1110 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and an application program, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 1110.

[0208] The processor 1110 is configured to map demodulation reference signals (DMRSs) according to a target mapping rule, the target mapping rule comprising: mapping N DMRS ports on K target resource blocks (RBs) and L target orthogonal frequency division multiplexing (OFDM) symbol groups; wherein P DMRS ports of the N DMRS ports are mapped on each target RB, and Q DMRS ports of the N DMRS ports are mapped on each target OFDM symbol group, the N DMRS ports belong to M code division multiplexing (CDM) groups, and N, K, L, Q, and M are positive integers.

[0209] Optionally, in a case where Q=N and the N DMRS ports are mapped with a granularity of G RBs, a value of P satisfies any one of the following: P=N;

[0210] G is an even integer greater than 0.

[0211] Optionally, in a case where P=N and a type of the DMRS is a first configuration type, the target mapping rule further comprises:

[0212] Each DMRS port is mapped on each OFDM symbol in the target OFDM symbol group with 6 first resource elements (REs) in two target RBs as a basic mapping unit.

[0213] Optionally, 4 first REs of the 6 first REs are located in one target RB of the two target RBs, and the remaining 2 first REs of the 6 first REs are located in the other target RB.

[0214] Optionally, a subcarrier spacing between the 6 first REs satisfies at least one of the following:

[0215] A subcarrier spacing between a first one of the 4 first REs and a second one of the 4 first REs is 1 RE, and a subcarrier spacing between a third one of the 4 first REs and a fourth one of the 4 first REs is 1 RE.

[0216] A subcarrier spacing between a last one of the first 2 first REs of the 4 first REs and a first one of the last 2 first REs of the 4 first REs is 6 REs.

[0217] A subcarrier spacing between the remaining 2 first REs is 1 RE.

[0218] Optionally, in a case where and the type of the DMRS is the first configuration type, the target mapping rule further comprises:

[0219] On each of the OFDM symbols in the target OFDM symbol group, each DMRS port is mapped with 6 second REs in one of the two continuous target RBs as a basic mapping unit, wherein the subcarriers between two adjacent second REs are 1 RE.

[0220] Optionally, in a case where and the type of the DMRS is the second configuration type, the target mapping rule further comprises:

[0221] On each of the OFDM symbols in the target OFDM symbol group, each DMRS port is mapped with 4 third REs in one of the two continuous target RBs as a basic mapping unit.

[0222] Optionally, the subcarriers of the third REs satisfy at least one of the following:

[0223] The subcarriers of the first two third REs of the 4 third REs are adjacent, and the subcarriers of the last two third REs are adjacent.

[0224] The subcarriers of the last one of the first two third REs and the first one between the last two third REs of the 4 third REs are 4 REs.

[0225] Optionally, in a case where , the target mapping rule further comprises any one of the following:

[0226] The M CDM groups are located in one of the two continuous target RBs, and the other CDM groups are located in the other target RB.

[0227] The M CDM groups are located in each of the target RBs.

[0228] Optionally, in a case where Q=N, P=N, and the type of the DMRS interface is the second configuration type, the target mapping rule further comprises:

[0229] On each of the OFDM symbols in the target OFDM symbol group, each DMRS port is mapped with 2 fourth REs in one of the target RBs as a basic mapping unit, and the subcarriers of the 2 fourth REs are adjacent.

[0230] Optionally, in a case where L is greater than 1 and P=N, the value of Q satisfies any one of the following:

[0231] Optionally, the target mapping rule further comprises at least one of the following: ​

[0232] When the type of the DMRS is the first configuration type, each DMRS port is mapped with 6 fifth REs in one of the target RBs as a basic mapping unit on each OFDM symbol in the target OFDM symbol group.

[0233] When the type of the DMRS is the second configuration type, each DMRS port is mapped with 4 sixth REs in one of the target RBs as a basic mapping unit on each OFDM symbol in the target OFDM symbol group.

[0234] Optionally, the subcarrier spacing between adjacent fifth REs is one RE.

[0235] Optionally, the subcarrier spacing between the 4 sixth REs satisfies at least one of the following:

[0236] The subcarriers of the first 2 sixth REs in the 4 sixth REs are adjacent, and the subcarriers of the last 2 sixth REs are adjacent.

[0237] The subcarrier spacing between the last one of the first 2 sixth REs in the 4 sixth REs and the first one of the last 2 sixth REs in the 4 sixth REs is 4 REs.

[0238] Optionally, the OFDM symbols of the OFDM symbol groups other than the OFDM symbol group where the front OFDM symbol is located are located at additional positions of the DMRS.

[0239] Optionally, the value of M satisfies at least one of the following:

[0240] When the type of the DMRS is the first configuration type, M is equal to 2 or 4;

[0241] When the type of the DMRS is the second configuration type, M is equal to 3 or 6.

[0242] Optionally, the target OFDM symbol group satisfies at least one of the following:

[0243] When the DMRS is a single-symbol structure, the target OFDM symbol group contains 1 OFDM symbol;

[0244] When the DMRS is a double-symbol structure, the target OFDM symbol group contains 2 consecutive OFDM symbols.

[0245] Optionally, the CDM group satisfies at least one of the following:

[0246] Each CDM group includes Y DMRS ports, Y is a positive integer, and

[0247] The DMRS ports in the same CDM group adopt a frequency division orthogonal cover sequence with a length of 2, or a frequency division orthogonal cover sequence with a length of 2 and a time division orthogonal cover sequence with a length of 2 are multiplexed.

[0248] Optionally, in the case that the N DMRS ports are mapped with G RBs as granularity, the target bandwidth corresponding to the data channel scheduled by the network side device for the terminal satisfies at least one of the following conditions:

[0249] The number of RBs contained in the target bandwidth is a multiple of G, and G is an even number greater than 0.

[0250] The bundle parameter associated with the target bandwidth is agreed by a protocol, and the bundle parameter corresponds to G RBs as granularity.

[0251] The target bandwidth is divided into M bundle units according to the bundle parameter, wherein the division rule takes a reference point A as a starting position.

[0252] In the case that the data channel adopts frequency hopping, the resource bandwidth corresponding to each hop is a multiple of G, or the starting position of the resource bandwidth corresponding to each hop is the starting position of each bundle unit divided by the bundle parameter.

[0253] Optionally, in the case that the N DMRS ports are mapped with G RBs as granularity, the difference between the starting positions of the scheduling resource bandwidths corresponding to the multiple terminals scheduled in cooperation is a multiple of G or 0, and G is an even number greater than 0.

[0254] In the embodiments of the present application, P DMRS ports in the N DMRS ports are mapped on each target RB, Q DMRS ports in the N DMRS ports are mapped on each target OFDM symbol group, and the N DMRS ports belong to M code division multiplexing (CDM) groups. In this way, the DMRS of the data channel can support more DMRS ports. Therefore, the embodiments of the present application can improve the transmission capacity of the communication system.

[0255] The embodiment of the present application further provides a network side device, comprising a processor and a communication interface, the processor is configured to map a demodulation reference signal (DMRS) according to a target mapping rule, the target mapping rule comprises: mapping N DMRS ports on K target resource blocks (RBs) and L target orthogonal frequency division multiplexing (OFDM) symbol groups; wherein, P DMRS ports in the N DMRS ports are mapped on each target RB, and Q DMRS ports in the N DMRS ports are mapped on each target OFDM symbol group, the N DMRS ports belong to M code division multiplexing (CDM) groups, and N, K, L, Q and M are positive integers. The network side device embodiment corresponds to the method embodiment, each implementation process and implementation manner of the method embodiment can be applied to the network side device embodiment, and the same technical effects can be achieved.

[0256] Specifically, the embodiment of the present application further provides a network side device. As shown in the figure, Figure 12 The network side device 1200 comprises an antenna 1201, a radio frequency device 1202, a baseband device 1203, a processor 1204 and a memory 1205. The antenna 1201 is connected with the radio frequency device 1202. In the uplink direction, the radio frequency device 1202 receives information through the antenna 1201, and sends the received information to the baseband device 1203 for processing. In the downlink direction, the baseband device 1203 processes the information to be sent and sends it to the radio frequency device 1202, and the radio frequency device 1202 processes the received information and sends it out through the antenna 1201.

[0257] The method performed by the network side device in the above embodiment can be implemented in the baseband device 1203, which comprises a baseband processor.

[0258] The baseband device 1203 may, for example, comprise at least one baseband board, and a plurality of chips are arranged on the baseband board, as shown in the figure, Figure 12 One of the chips is, for example, a baseband processor, which is connected with the memory 1205 through a bus interface to call the program in the memory 1205 and execute the network device operation shown in the above method embodiment.

[0259] The network side device may further comprise a network interface 1206, which is, for example, a common public radio interface (CPRI).

[0260] Specifically, the network side device 1200 of the embodiment of the present application further comprises instructions or programs stored in the memory 1205 and executable on the processor 1204, and the processor 1204 calls the instructions or programs in the memory 1205 to execute Figure 9The method executed by each module shown and the same technical effect achieved are not repeated here.

[0261] The embodiment of the present application further provides a readable storage medium, which stores a program or instructions, and the program or instructions are executed by a processor to realize each process of the demodulation reference signal mapping method embodiment and achieve the same technical effect. To avoid repetition, the details are not repeated here.

[0262] The processor is the processor in the terminal in the above embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0263] The embodiment of the present application further provides a chip, which includes a processor and a communication interface, the communication interface is coupled with the processor, and the processor is used to run a program or instructions to realize each process of the demodulation reference signal mapping method embodiment and achieve the same technical effect. To avoid repetition, the details are not repeated here.

[0264] It should be understood that the chip mentioned in the embodiment of the present application can also be referred to as a system chip, a system chip, a chip system or a system on chip, etc.

[0265] The embodiment of the present application further provides a computer program / program product, which is stored in a storage medium, and is executed by at least one processor to realize each process of the demodulation reference signal mapping method embodiment and achieve the same technical effect. To avoid repetition, the details are not repeated here.

[0266] The embodiment of the present application further provides a communication system, which includes a terminal and a network side device, the terminal is used to execute each process of the method embodiment and the network side device is used to execute each process of the method embodiment. Figure 2 The embodiment of the present application further provides a communication system, which includes a terminal and a network side device, the terminal is used to execute each process of the method embodiment and the network side device is used to execute each process of the method embodiment. Figure 2 The embodiment of the present application further provides a communication system, which includes a terminal and a network side device, the terminal is used to execute each process of the method embodiment and the network side device is used to execute each process of the method embodiment.

[0267] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the method and apparatus of the present application can be carried out by more than one process, method, article, or apparatus either simultaneously, concurrently, or with intervening action that are carried out at the same time, in any order, or in an overlapping manner. For example, the described method can be performed in a different order or simultaneously, and the various steps can be combined or omitted, or additional steps can be added, without departing from the scope of the described method. Also, features described with respect to certain examples can be combined in other examples.

[0268] From the above description of the embodiments, it is apparent that the above-described method can be implemented by software and necessary universal hardware platform, of course, it can also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present application can be embodied in the form of computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a plurality of instructions for making a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) execute the method described in various embodiments of the present application.

[0269] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-described specific embodiments, which are merely illustrative rather than restrictive, and those of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. A demodulation reference signal mapping method, characterized in that, The communication device maps a demodulation reference signal (DMRS) according to a target mapping rule, the target mapping rule comprising: mapping N DMRS ports on K target resource blocks (RBs) and L target orthogonal frequency division multiplexing (OFDM) symbol groups; wherein P DMRS ports of the N DMRS ports are mapped on each of the target RBs, and Q DMRS ports of the N DMRS ports are mapped on each of the target OFDM symbol groups, the N DMRS ports belong to M code division multiplexing (CDM) groups, and N, K, L, Q, and M are positive integers. Wherein, G is an even number greater than 0.

2. The method of claim 1, wherein, In the case of Q=N and the N DMRS ports are mapped with granularity of G RBs, the value of P satisfies any one of the following: P=N; In the case of P=N and the type of DMRS being a first configuration type, the target mapping rule further comprises:

3. The method of claim 2, wherein, On each of the OFDM symbols in the target OFDM symbol group, each DMRS port is mapped as a basic mapping unit in 6 first resource elements (REs) within one of the two target RBs; Wherein, the first configuration type is a DMRS configuration type associated with DMRS configuration type 1. 4 of the 6 first REs are located within one of the two target RBs, and the remaining 2 of the 6 first REs are located within the other target RB.

4. The method of claim 3, wherein, The subcarrier spacing between the 6 first REs satisfies at least one of the following:

5. The method of claim 4, wherein, The subcarrier spacing between the first 2 of the 4 first REs is 1 RE, and the subcarrier spacing between the last 2 of the 4 first REs is 1 RE; The subcarrier spacing between the last of the first 2 of the 4 first REs and the first of the last 2 of the 4 first REs is 6 REs; The subcarrier spacing between the remaining 2 of the first REs is 1 RE. On each of the OFDM symbols in the target OFDM symbol group, each DMRS port is mapped as a basic mapping unit in 6 second REs within one of the two target RBs, wherein the subcarrier spacing between adjacent two of the second REs is 1 RE; 6. The method of claim 2, wherein, In and the type of the DMRS is the first configuration type, the target mapping rule further comprises: Wherein, the first configuration type is a DMRS configuration type associated with DMRS configuration type 1. On each of the OFDM symbols in the target OFDM symbol group, each DMRS port is mapped as a basic mapping unit in 4 third REs within one of the two target RBs; 7. The method of claim 2, wherein, In and the type of the DMRS is a second configuration type, the target mapping rule further comprises: Wherein, the second configuration type is a DMRS configuration type associated with DMRS configuration type 2. The subcarrier spacing of the third REs satisfies at least one of the following:

8. The method of claim 7, wherein, The subcarriers of the first two of the 4 third REs are adjacent, and the subcarriers of the last two of the 4 third REs are adjacent; The subcarrier spacing between the last of the first two of the 4 third REs and the first of the last two of the 4 third REs is 4 REs. All of the M CDM groups are located within each of the target RBs.

9. The method of claim 2, wherein, In the case, the target mapping rule further comprises any of the following: The M CDM groups are located in one of the two target RBs, and the other CDM group is located in the other target RB. CDM group is located in the other target RB. In the case of Q=N, P=N, and the type of DMRS interface being a second configuration type, the target mapping rule further comprises:

10. The method of claim 1, wherein, ​ Each DMRS port is mapped with 2 fourth REs in one of the target RBs as a basic mapping unit on each OFDM symbol in the target OFDM symbol group, and the 2 fourth REs are adjacent in subcarriers. The second configuration type is a DMRS configuration type associated with DMRS configuration type 2.

11. The method of claim 1, wherein, In the case where L is greater than 1 and P = N, the value of Q satisfies any one of the following:

12. The method of claim 11, wherein, The target mapping rule further includes at least one of the following: When the type of the DMRS is the first configuration type, each DMRS port is mapped with 6 fifth REs in one of the target RBs as a basic mapping unit on each OFDM symbol in the target OFDM symbol group. When the type of the DMRS is the second configuration type, each DMRS port is mapped with 4 sixth REs in one of the target RBs as a basic mapping unit on each OFDM symbol in the target OFDM symbol group. The first configuration type is a DMRS configuration type associated with DMRS configuration type 1.

13. The method of claim 12, wherein, The subcarrier spacing between adjacent fifth REs is one RE.

14. The method of claim 12, wherein, The subcarrier spacing between the 4 sixth REs satisfies at least one of the following: The first 2 sixth REs of the 4 sixth REs are adjacent in subcarriers, and the last 2 sixth REs are adjacent in subcarriers. The subcarrier spacing between the last sixth RE of the first 2 sixth REs of the 4 sixth REs and the first sixth RE of the last 2 sixth REs of the 4 sixth REs is 4 REs.

15. The method of claim 1, wherein, The OFDM symbols of the OFDM symbol groups other than the OFDM symbol group where the front OFDM symbol is located are located at additional positions of the DMRS.

16. The method of claim 1, wherein, The value of M satisfies at least one of the following: When the type of the DMRS is the first configuration type, M is equal to 2 or 4. When the type of the DMRS is the second configuration type, M is equal to 3 or 6. The first configuration type is a DMRS configuration type associated with DMRS configuration type 1, and the second configuration type is a DMRS configuration type associated with DMRS configuration type 2.

17. The method of claim 1, wherein, The target OFDM symbol group satisfies at least one of the following: When the DMRS is a single-symbol structure, the target OFDM symbol group includes 1 OFDM symbol. When the DMRS is a double-symbol structure, the target OFDM symbol group includes 2 consecutive OFDM symbols.

18. The method of claim 1, wherein, The CDM group satisfies at least one of the following: Y DMRS ports are included in each CDM group, Y is a positive integer, and The DMRS ports in the same CDM group use a frequency division orthogonal cover code sequence with a length of 2, or use a frequency division orthogonal cover code sequence with a length of 2 and a time division orthogonal cover code sequence with a length of 2 for multiplexing.

19. The method of claim 1, wherein, In the case where the N DMRS ports are mapped with G RBs as granularity, the target bandwidth corresponding to the data channel scheduled by the network side device for the terminal satisfies at least one of the following: The number of RBs included in the target bandwidth is a multiple of G, and G is an even number greater than 0. The bundle parameter associated with the target bandwidth is agreed by a protocol, and the bundle parameter corresponds to G RBs as granularity. The target bandwidth is divided into M bundle units according to beam parameters, wherein a rule of the division takes a reference point A as a starting position; In the case that the data channel adopts frequency hopping, the resource bandwidth corresponding to each hop is a multiple of G, or the starting position of the resource bandwidth corresponding to each hop is the starting position of each bundle unit divided by the beam parameters.

20. The method of claim 1, wherein, In the case that the N DMRS ports are mapped with G RBs as granularity, the difference between the starting positions of the scheduling resource bandwidths corresponding to the multiple terminals scheduled in cooperation is a multiple of G or 0, G being an even number greater than 0.

21. An apparatus for demodulation reference signal mapping, the apparatus comprising: Comprise: The mapping module is configured to map a demodulation reference signal (DMRS) according to a target mapping rule, wherein the target mapping rule comprises: mapping N DMRS ports on K target resource blocks (RBs) and L target orthogonal frequency division multiplexing (OFDM) symbol groups; wherein P DMRS ports in the N DMRS ports are mapped on each target RB, and Q DMRS ports in the N DMRS ports are mapped on each target OFDM symbol group, the N DMRS ports belong to M code division multiplexing (CDM) groups, and N, K, L, Q, and M are all positive integers.

22. The apparatus of claim 21, wherein, In the case that Q=N, and the N DMRS ports are mapped with granularity of G RBs, the value of P satisfies any one of the following: P=N; G is an even number greater than 0.

23. The apparatus of claim 22, wherein, In the case that P=N and the type of the DMRS is a first configuration type, the target mapping rule further comprises: In each OFDM symbol in the target OFDM symbol group, each DMRS port is mapped with 6 first resource elements (REs) in a target RB of two continuous target RBs as a basic mapping unit; The first configuration type is a DMRS configuration type associated with DMRS configuration type 1.

24. The apparatus of claim 22, wherein, In and the type of the DMRS is the first configuration type, the target mapping rule further comprises: In each OFDM symbol in the target OFDM symbol group, each DMRS port is mapped with 6 second REs in a target RB of two continuous target RBs as a basic mapping unit, wherein the subcarrier spacing between adjacent two second REs is 1 RE; The first configuration type is a DMRS configuration type associated with DMRS configuration type 1.

25. The apparatus of claim 22, wherein, In and the type of the DMRS is a second configuration type, the target mapping rule further comprises: In each OFDM symbol in the target OFDM symbol group, each DMRS port is mapped with 4 third REs in a target RB of two continuous target RBs as a basic mapping unit; The second configuration type is a DMRS configuration type associated with DMRS configuration type 2.

26. The apparatus of claim 22, wherein, In the case, the target mapping rule further comprises any of the following: The M CDM groups are located in one of the two target RBs, and the other CDM group is located in the other target RB. CDM group is located in the other target RB. All the M CDM groups are located in each target RB.

27. The apparatus of claim 21, wherein, In the case that Q=N, P=N, and the type of the DMRS interface is a second configuration type, the target mapping rule further comprises: In each OFDM symbol in the target OFDM symbol group, each DMRS port is mapped with 2 fourth REs in a target RB as a basic mapping unit, and the subcarriers of the 2 fourth REs are adjacent; The second configuration type is a DMRS configuration type associated with DMRS configuration type 2.

28. The apparatus of claim 21, wherein, In the case where L is greater than 1 and P = N, the value of Q satisfies any one of the following:

29. The apparatus of claim 28, wherein, The target mapping rule further comprises at least one of the following: When the type of the DMRS is the first configuration type, each DMRS port is mapped with 6 fifth REs in one of the target RBs as a basic mapping unit on each OFDM symbol in the target OFDM symbol group; When the type of the DMRS is the second configuration type, each DMRS port is mapped with 4 sixth REs in one of the target RBs as a basic mapping unit on each OFDM symbol in the target OFDM symbol group; The first configuration type is a DMRS configuration type associated with DMRS configuration type 1, and the second configuration type is a DMRS configuration type associated with DMRS configuration type 2.

30. A communications device, characterized by A processor and a memory, the memory stores programs or instructions executable on the processor, and the programs or instructions are executed by the processor to implement the steps of the demodulation reference signal mapping method according to any one of claims 1 to 20.

31. A readable storage medium, characterized by, The readable storage medium stores programs or instructions, and the programs or instructions are executed by the processor to implement the steps of the demodulation reference signal mapping method according to any one of claims 1 to 20.

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