Method and apparatus for receiving and transmitting signals, and storage medium

Abstract

The present disclosure provides a method and apparatus for receiving and transmitting signals, and a storage medium. Among them, the method for receiving signals includes: determining a first initial resource element (RE) corresponding to a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system; determining a second initial RE corresponding to a reference signal of a second system; based on the first initial RE, determining candidate REs corresponding to the first DMRS by means of shifting; wherein the resources corresponding to the first initial RE and the second initial RE are the same; detecting and receiving the first DMRS on available REs among the candidate REs; wherein the available REs are not occupied by other reference signals, and the other reference signals are a second DMRS or the reference signal of the second system. The present disclosure can effectively avoid the interference of the reference signal from the LTE system on the DMRS of the PDCCH of NR, and at the same time improve the system capacity of the NR PDCCH and improve the performance of the NR system.

Description

Technical Field

[0001] The present disclosure relates to the field of communications, and in particular, to a method and apparatus for receiving and transmitting signals, and a storage medium. Background Art

[0002] When the LTE (Long Term Evolution) system and the NR (New Radio) system coexist in the same frequency band, the reference signal of LTE may cause serious interference to the NR system, resulting in a decline in the performance of the NR PDCCH (Physical Downlink Control Channel), and its capacity is severely limited, restricting the performance and scheduling flexibility of the NR system. Summary of the Invention

[0003] To overcome the problems existing in the related art, embodiments of the present disclosure provide a method and apparatus for receiving and transmitting signals, and a storage medium, which can effectively improve the channel estimation performance of the NR system and enhance the transmission performance of the NR PDCCH in the DSS (Dynamic Spectrum Sharing) scenario.

[0004] According to a first aspect of the embodiments of the present disclosure, a method for receiving a signal is provided. The method is executed by a terminal and includes:

[0005] Determine a first initial resource element (RE) corresponding to a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system;

[0006] Determine a second initial RE corresponding to a reference signal of a second system;

[0007] Based on the first initial RE, determine candidate REs corresponding to the first DMRS by a shifting method; wherein the first initial RE and the second initial RE correspond to the same resources; on the available REs among the candidate REs, detect and receive the first DMRS; wherein the available REs are not occupied by other reference signals, and the other reference signals are a second DMRS or the reference signal of the second system.

[0008] Optionally, the determining candidate REs corresponding to the first DMRS by a shifting method based on the first initial RE includes:

[0009] Based on the first initial RE, determine a first moving range by a shifting method;

[0010] Determine the REs within the first moving range as the candidate REs.

[0011] Optionally, determining the first moving range based on the first initial RE by means of shifting includes:

[0012] Based on the first initial RE, perform sequential shifting in the first direction in the frequency domain;

[0013] When the first shifting stop condition is satisfied, determine the frequency domain range obtained by shifting in the first direction as the first moving range.

[0014] Optionally, determining the first moving range based on the first initial RE includes:

[0015] Based on the first initial RE, perform sequential shifting in the first direction in the frequency domain;

[0016] When the first shifting stop condition is satisfied, based on the first initial RE, perform sequential shifting in the second direction in the frequency domain;

[0017] When the first shifting stop condition is satisfied again, determine the frequency domain range obtained by shifting in the first direction and the second direction as the first moving range.

[0018] Optionally, determining the first moving range based on the first initial RE includes:

[0019] Based on the first initial RE, perform sequential shifting in the first direction in the frequency domain;

[0020] When the first shifting stop condition is satisfied, based on the first initial RE, perform sequential shifting in the second direction in the frequency domain;

[0021] When the first shifting stop condition is satisfied again, based on the first initial RE, move one time unit in the third direction in the time domain;

[0022] Continue to perform shifting in accordance with the shifting sequence of the first direction, the second direction, and the third direction;

[0023] When the shifting in the third direction satisfies the second shifting stop condition, determine the frequency domain range obtained by shifting in the first direction and the second direction and the time domain range obtained by shifting in the third direction as the first moving range.

[0024] Optionally, the first direction is any one of the following:

[0025] The direction of increasing frequency;

[0026] The direction of decreasing frequency.

[0027] Optionally, the first direction is the direction of increasing frequency, and the second direction is the direction of decreasing frequency; or,

[0028] The first direction is the direction in which the frequency decreases, and the second direction is the direction in which the frequency increases.

[0029] Optionally, the third direction is the direction in which the time unit increases.

[0030] Optionally, the first stop shifting condition includes that the number of frequency domain resources to be moved is equal to a pre-determined maximum number of frequency units;

[0031] The second stop shifting condition includes that the number of time units to be moved is equal to a pre-determined maximum number of time units.

[0032] Optionally, the maximum number of frequency units is equal to 3.

[0033] Optionally, the maximum number of time units is equal to the number of time units during which the control resource set CORESET where the first DMRS is located lasts.

[0034] Optionally, any one of the following methods is adopted to determine the maximum number of frequency units:

[0035] Pre-defined based on the protocol; indicated by the signaling sent by the base station; based on the terminal reported capabilities. Optionally, any one of the following methods is adopted to determine the maximum number of time units:

[0036] Pre-defined based on the protocol; indicated by the signaling sent by the base station; based on the terminal reported capabilities.

[0037] Optionally, detecting and receiving the first DMRS on the available REs in the candidate REs includes:

[0038] Detecting and receiving the first DMRS on the available REs determined in the fourth direction; wherein, the fourth direction is the shifting direction with the largest number of available REs determined among the first direction and the second direction.

[0039] Optionally, the method further includes:

[0040] Determining that there is no available RE in the candidate REs and not receiving the first DMRS.

[0041] According to a second aspect of the embodiments of the present disclosure, a signal receiving method is provided, which is executed by a terminal and includes:

[0042] Determining a first initial resource element RE where a first demodulation reference signal DMRS of a physical downlink control channel PDCCH of a first system is located;

[0043] Determining a second initial RE where a reference signal of a second system is located;

[0044] Determine available REs; wherein, the resources corresponding to the first initial RE and the second initial RE are the same, and the available REs are not occupied by other reference signals within the first frequency domain range corresponding to the PDCCH, and the other reference signals include the second DMRS or the reference signals of the second system;

[0045] On the available REs, detect and receive the first DMRS.

[0046] Optionally, the determining of the available REs includes:

[0047] Within the first frequency domain range, determine the first proportion of the second initial REs occupied;

[0048] Based on the first proportion, determine an available RE index set; wherein, there is a preset corresponding relationship between the first proportion and the available RE index set;

[0049] Exclude the second initial REs from the first frequency domain range to obtain a candidate RE set;

[0050] Based on the available RE index set, determine the available REs in the candidate RE set.

[0051] Optionally, the determining of the first proportion of the second initial REs occupied within the first frequency domain range includes:

[0052] Determine the ratio of the number of the second initial REs in the first frequency domain range to the total number of REs included in the first frequency domain range to obtain the first proportion.

[0053] Optionally, the determining of the available REs in the candidate RE set based on the available RE index set includes:

[0054] Renumber each RE in the candidate RE set in ascending order of the corresponding index, and determine the index value of each RE in the candidate RE set;

[0055] In the candidate RE set, determine the REs indicated by the available RE index set as the available REs.

[0056] Optionally, the first frequency domain range is any one of the following:

[0057] The frequency domain range of the BWP (Bandwidth Part) where the PDCCH is located;

[0058] A resource block RB range within the frequency domain range where the PDCCH is located; or

[0059] The frequency domain range of the control resource set CORESET corresponding to the PDCCH.

[0060] According to a third aspect of embodiments of the present disclosure, there is provided a method for transmitting a signal, which is executed by a base station and includes:

[0061] Determine a first initial resource element (RE) where a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system is located;

[0062] Determine a second initial RE where a reference signal of a second system is located;

[0063] Based on the first initial RE, determine candidate REs corresponding to the first DMRS by means of shifting; wherein, the resources corresponding to the first initial RE and the second initial RE are the same;

[0064] Transmit the first DMRS on available REs among the candidate REs; wherein, the available REs are not occupied by other reference signals, and the other reference signals are a second DMRS or the reference signal of the second system.

[0065] Optionally, the determining, based on the first initial RE, candidate REs corresponding to the first DMRS by means of shifting includes:

[0066] Based on the first initial RE, determine a first moving range by means of shifting;

[0067] Determine the REs located within the first moving range as the candidate REs.

[0068] Optionally, the determining, based on the first initial RE, a first moving range by means of shifting includes:

[0069] Based on the first initial RE, perform sequential shifting in a first direction in the frequency domain;

[0070] When a first stop shifting condition is satisfied, determine the frequency domain range obtained by shifting in the first direction as the first moving range.

[0071] Optionally, the determining, based on the first initial RE, a first moving range by means of shifting includes:

[0072] Based on the first initial RE, perform sequential shifting in a first direction in the frequency domain;

[0073] When a first stop shifting condition is satisfied, based on the first initial RE, perform sequential shifting in a second direction in the frequency domain;

[0074] When the first stop shifting condition is satisfied again, determine the frequency domain range obtained by shifting in the first direction and the second direction as the first moving range.

[0075] Optionally, determining a first moving range based on the first initial RE by means of shifting includes:

[0076] Sequentially shifting in a first direction in the frequency domain based on the first initial RE;

[0077] When a first stop shifting condition is satisfied, sequentially shifting in a second direction in the frequency domain based on the first initial RE;

[0078] When the first stop shifting condition is satisfied again, moving one time unit in a third direction in the time domain based on the first initial RE;

[0079] Continuing to shift in accordance with the shifting sequence of the first direction, the second direction, and the third direction;

[0080] When shifting in the third direction satisfies a second stop shifting condition, determining the frequency domain range obtained by shifting in the first direction and the second direction and the time domain range obtained by shifting in the third direction as the first moving range.

[0081] Optionally, the first direction is any one of the following:

[0082] The direction of increasing frequency;

[0083] The direction of decreasing frequency.

[0084] Optionally, the first direction is the direction of increasing frequency and the second direction is the direction of decreasing frequency; or,

[0085] The first direction is the direction of decreasing frequency and the second direction is the corresponding direction of increasing frequency.

[0086] Optionally, the third direction is the direction of increasing time unit.

[0087] Optionally, the first stop shifting condition includes that the number of frequency domain resources moved is equal to a predetermined maximum number of frequency units;

[0088] The second stop shifting condition includes that the number of time units moved is equal to a predetermined maximum number of time units.

[0089] Optionally, the maximum number of frequency units is equal to 3.

[0090] Optionally, the maximum number of time units is equal to the number of time units for which the control resource set CORESET where the first DMRS is located lasts.

[0091] Optionally, the maximum number of frequency units is determined by any one of the following methods:

[0092] Based on protocol pre - definition; based on the indication of the signaling sent by the base station; based on the terminal reported capabilities.

[0093] Optionally, determine the maximum number of time units by any one of the following methods:

[0094] Based on protocol pre - definition; based on the indication of the signaling sent by the base station; based on the terminal reported capabilities. Optionally, sending the first DMRS on the available REs among the candidate REs includes:

[0095] Sending the first DMRS on the available REs determined in the fourth direction; wherein, the fourth direction is the shifting direction with the largest number of available REs determined among the first direction and the second direction.

[0096] Optionally, the method further includes:

[0097] Determine that there are no available REs in the candidate REs, and do not send the first DMRS.

[0098] According to the fourth aspect of the embodiments of the present disclosure, a method for sending a signal is provided, which is executed by a base station and includes:

[0099] Determine the first initial resource element RE where the first demodulation reference signal DMRS of the physical downlink control channel PDCCH of the first system is located;

[0100] Determine the second initial RE where the reference signal of the second system is located;

[0101] Determine available REs; wherein, the resources corresponding to the first initial RE and the second initial RE are the same, and the available REs are not occupied by other reference signals within the first frequency domain range corresponding to the PDCCH, and the other reference signals include the second DMRS or the reference signal of the second system;

[0102] Send the first DMRS on the available REs.

[0103] Optionally, the determining of the available REs includes:

[0104] Determine the first ratio occupied by the second initial RE within the first frequency domain range;

[0105] Based on the first ratio, determine an available RE index set; wherein, there is a preset corresponding relationship between the first ratio and the available RE index set;

[0106] Exclude the second initial RE from the first frequency domain range to obtain a candidate RE set;

[0107] Based on the available RE index set, determine the available REs in the candidate RE set.

[0108] Optionally, determining the first ratio of the second initial REs in the first frequency domain range includes:

[0109] Determine the ratio of the number of the second initial REs in the first frequency domain range to the total number of REs included in the first frequency domain range to obtain the first ratio.

[0110] Optionally, based on the available RE index set, determining the available REs in the candidate RE set includes:

[0111] Renumber each RE in the candidate RE set in ascending order according to the corresponding index, and determine the index value of each RE in the candidate RE set;

[0112] In the candidate RE set, determine the REs indicated by the available RE index set as the available REs.

[0113] Optionally, the first frequency domain range is any one of the following:

[0114] The frequency domain range of the partial bandwidth BWP where the PDCCH is located;

[0115] A resource block RB range within the frequency domain range where the PDCCH is located; or

[0116] The frequency domain range of the control resource set CORESET corresponding to the PDCCH.

[0117] According to the fifth aspect of the embodiments of the present disclosure, a device for receiving a signal is provided, including:

[0118] A processing module configured to determine a first initial resource element RE corresponding to a first demodulation reference signal DMRS of a downlink control channel PDCCH of a first system;

[0119] The processing module is further configured to determine a second initial RE corresponding to a reference signal of a second system;

[0120] The processing module is further configured to determine candidate REs corresponding to the first DMRS based on the first initial RE by a shifting method; wherein the resources corresponding to the first initial RE and the second initial RE are the same;

[0121] A receiving module configured to detect and receive the first DMRS on the available REs in the candidate REs; wherein the available REs are not occupied by other reference signals, and the other reference signals are a second DMRS or the reference signal of the second system.

[0122] According to a sixth aspect of the embodiments of the present disclosure, there is provided an apparatus for receiving a signal, including:

[0123] A processing module, configured to determine a first initial resource element (RE) where a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system is located;

[0124] The processing module is further configured to determine a second initial RE where a reference signal of a second system is located;

[0125] The processing module is further configured to determine available REs; wherein the resources corresponding to the first initial RE and the second initial RE are the same, and the available REs are not occupied by other reference signals within a first frequency domain range corresponding to the PDCCH, and the other reference signals include a second DMRS or the reference signal of the second system;

[0126] A receiving module, configured to detect and receive the first DMRS on the available REs.

[0127] According to a seventh aspect of the embodiments of the present disclosure, there is provided an apparatus for transmitting a signal, including:

[0128] A processing module, configured to determine a first initial resource element (RE) where a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system is located;

[0129] The processing module is further configured to determine a second initial RE where a reference signal of a second system is located;

[0130] The processing module is further configured to determine candidate REs corresponding to the first DMRS by a shifting method based on the first initial RE; wherein the resources corresponding to the first initial RE and the second initial RE are the same;

[0131] A transmitting module, configured to transmit the first DMRS on available REs among the candidate REs; wherein the available REs are not occupied by other reference signals, and the other reference signals are a second DMRS or the reference signal of the second system.

[0132] According to an eighth aspect of the embodiments of the present disclosure, there is provided an apparatus for transmitting a signal, including:

[0133] A processing module, configured to determine a first initial resource element (RE) where a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system is located;

[0134] The processing module is further configured to determine a second initial RE where a reference signal of a second system is located;

[0135] The processing module is further configured to determine available REs; wherein, the resources corresponding to the first initial RE and the second initial RE are the same, and the available REs are not occupied by other reference signals within the first frequency domain range corresponding to the PDCCH, and the other reference signals include the second DMRS or the reference signals of the second system;

[0136] The sending module is configured to send the first DMRS on the available REs.

[0137] According to a ninth aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium storing a computer program for executing the method for receiving a signal according to any one of the above.

[0138] According to a tenth aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium storing a computer program for executing the method for sending a signal according to any one of the above.

[0139] According to an eleventh aspect of the embodiments of the present disclosure, there is provided a communication device including:

[0140] A processor;

[0141] A memory for storing instructions executable by the processor;

[0142] Wherein, the processor is configured to execute the executable instructions to implement the steps of the method for receiving a signal according to any one of the above.

[0143] According to a twelfth aspect of the embodiments of the present disclosure, there is provided a signal transmission device including:

[0144] A processor;

[0145] A memory for storing instructions executable by the processor;

[0146] Wherein, the processor is configured to execute the executable instructions to implement the steps of the method for sending a signal according to any one of the above.

[0147] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

[0148] In the embodiments of the present disclosure, interference from the reference signals of the LTE system to the DMRS of the NR PDCCH can be effectively avoided, while the system capacity of the NR PDCCH is improved and the performance of the NR system is improved.

[0149] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. Description of the Drawings

[0150] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention.

[0151] Figures 1A to 1C It is a schematic diagram of the resource mapping relationship of CRS in the time-frequency domain shown according to an exemplary embodiment.

[0152] Figure 2 It is a schematic diagram of the multiplexing of PCFICH and 4-port CRS shown according to an exemplary embodiment.

[0153] Figure 3 It is a schematic diagram of the PCFICH process shown according to an exemplary embodiment.

[0154] Figure 4 It is a schematic diagram of the multiplexing of PCFICH and PHICH shown according to an exemplary embodiment.

[0155] Figure 5A It is a schematic diagram of the multiplexing of NR PDCCH DMRS and LTE 4-port CRS shown according to an exemplary embodiment.

[0156] Figure 5B It is a schematic diagram of the coexistence of NR PDCCH DMRS and LTE reference signals shown according to an exemplary embodiment.

[0157] Figure 6 It is another schematic diagram of the multiplexing of NR PDCCH DMRS and LTE 4-port CRS shown according to an exemplary embodiment.

[0158] Figure 7 It is another schematic diagram of the multiplexing of PCFICH and PHICH shown according to an exemplary embodiment.

[0159] Figure 8 It is a schematic diagram of the method flow of receiving a signal shown according to an exemplary embodiment.

[0160] Figure 9 It is another schematic diagram of the method flow of receiving a signal shown according to an exemplary embodiment.

[0161] Figure 10 It is another schematic diagram of the method flow of receiving a signal shown according to an exemplary embodiment.

[0162] Figure 11 It is another schematic diagram of the method flow of receiving a signal shown according to an exemplary embodiment.

[0163] Figure 12AIt is a schematic flowchart of another method for receiving signals shown according to an exemplary embodiment.

[0164] Figure 12B It is a schematic flowchart of another method for receiving signals shown according to an exemplary embodiment.

[0165] Figure 13 It is a schematic flowchart of another method for receiving signals shown according to an exemplary embodiment.

[0166] Figure 14 It is a schematic flowchart of another method for receiving signals shown according to an exemplary embodiment.

[0167] Figure 15 It is a schematic flowchart of a method for transmitting signals shown according to an exemplary embodiment.

[0168] Figure 16 It is a schematic flowchart of another method for transmitting signals shown according to an exemplary embodiment.

[0169] Figure 17A It is a schematic diagram for determining available REs shown according to an exemplary embodiment.

[0170] Figure 17B It is a schematic diagram of another method for determining available REs shown according to an exemplary embodiment.

[0171] Figure 18 It is a schematic diagram of another method for determining available REs shown according to an exemplary embodiment.

[0172] Figure 19 It is a schematic diagram of another method for determining available REs shown according to an exemplary embodiment.

[0173] Figure 20 It is a block diagram of a device for receiving signals shown according to an exemplary embodiment.

[0174] Figure 21 It is a block diagram of another device for receiving signals shown according to an exemplary embodiment.

[0175] Figure 22 It is a block diagram of a device for transmitting signals shown according to an exemplary embodiment.

[0176] Figure 23 It is a block diagram of another device for transmitting signals shown according to an exemplary embodiment.

[0177] Figure 24 It is a schematic structural diagram of a device for receiving signals shown according to an exemplary embodiment of the present disclosure.

[0178] Figure 25This is a schematic structural diagram of a device for transmitting signals shown by the present disclosure according to an exemplary embodiment. Detailed implementation manners

[0179] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with the present invention. On the contrary, they are only examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0180] The terms used in the present disclosure are for the purpose of describing specific embodiments only and are not intended to limit the present disclosure. The singular forms “a”, “the” and “said” used in the present disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and encompasses any and all possible combinations of at least one of the associated listed items.

[0181] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word “if” as used herein may be interpreted as “when” or “while” or “in response to determining”.

[0182] On the frequency bands where LTE and NR coexist, the LTE CRS (Cell-specific Reference Signal) needs to be continuously transmitted, which will cause very strong interference to the NR system. In the current protocol, to avoid the degradation of NR PDCCH performance caused by strong interference from the LTE system, the NR terminal only detects the PDCCH candidates that do not overlap with the LTE CRS at all. However, considering that the LTE CRS supports up to 4 ports, at this time the CRS occupies 6 OFDM (Orthogonal Frequency Division Multiplexing) symbols within a slot. In this case, the NR PDCCH can only be transmitted on the remaining 8 OFDM symbols and cannot be transmitted within a CORESET (Control Resource Set) with a duration of 3 consecutive symbols, thus severely restricting the capacity and transmission performance of the NR PDCCH. To further improve the resource utilization efficiency of the PDCCH in the DSS scenario and enhance the PDCCH capacity, Rel-18 (Release-18) WID supports the transmission of the NR PDCCH on the symbol where the CRS is located.

[0183] In the DSS scenario, for the NR system, it will be strongly and continuously interfered by the CRS. If there is NR DMRS (Demodulatin Reference Signal) transmission on the resources occupied by the CRS transmission, it will seriously affect the PDCCH transmission performance.

[0184] From another perspective, as the cell-level essential signals of LTE, PHICH (Physical hybrid ARQ indicator channel) and PCFICH (Physical control format indicator channel), if there is a conflict between the REs they occupy and the REs occupied by the NR PDCCH DMRS, it will also cause serious interference to them, thus reducing the PDCCH transmission performance.

[0185] Different from CRS, the control channels PHICH and PCFICH are continuously transmitted within a certain frequency domain range and within the REG (Resource Element Group) defined in LTE. PHICH can be transmitted on the 0th, 1st, and 2nd OFDM symbols of an LTE subframe. The mapping rules of the CRS, PHICH, PCFICH, and NR DMRS in the time-frequency domain are as follows:

[0186] CRS:

[0187] CRS is mainly used for downlink channel quality detection, such as indicators like RSRP (Reference Signal Receiving Power), as well as downlink channel estimation and coherent demodulation at the terminal side. The antenna ports of CRS are configurable, with a maximum of 4 antenna ports configurable, and CRS can only be transmitted on subframes with a subcarrier spacing Δf = 15 kHz.

[0188] For slot n s The CRS sequence symbols transmitted on antenna port p Its mapping relationship with the OFDM resource (k, l) is as follows:

[0189] k = 6m + (v + v shift ) mod 6

[0190]

[0191]

[0192]

[0193] Wherein, is equal to the number of RBs occupied by the LTE DL (Down Link) configured bandwidth, is equal to the number of OFDM symbols occupied within a slot, the cell-level symbol offset cell serial number configured by higher-layer signaling, and the relationship between the variable v and the antenna port p and the OFDM symbol l is as follows:

[0194]

[0195] It should be noted that if the resource element (k, l) is used for transmitting the CRS of a specific antenna port, the resource cannot be used for transmitting the CRS resources of other antenna ports.

[0196] For different antenna ports, the corresponding CRS mapping relationship in the time-frequency domain is, for example Figures 1A to 1C as shown (v shift= 0), the corresponding number of CRS antenna ports is 1, 2, and 4 respectively.

[0197] PCFICH:

[0198] The PCFICH channel, that is, the physical control format indicator channel, carries the information CFI (Control Field Indicator) to indicate the number of OFDM symbols occupied by the control channels (PDCCH and PHICH) in a subframe. The CFI carries 2 bits of information and is modulated by QPSK (Quadrature Phase Shift Keying).

[0199] Considering that only by decoding the PCFICH channel can the size of the control region be known, the PCFICH channel is always mapped to the first OFDM symbol of the downlink subframe or DwPTS (Downlink Pilot Time Slot). At the same time, in order to obtain the diversity gain in the frequency domain, the 4 REGs that make up the PCFICH channel are evenly distributed across the entire bandwidth.

[0200] For the i-th resource group mapped to antenna port p, the corresponding REG contains the RE indices as shown below:

[0201] z (p) (0) is mapped to the resource - element group represented by

[0202] z (p) (1) is mapped to the resource - element group represented by

[0203] z (p) (2) is mapped to the resource - element group represented by

[0204] z (p) (3) is mapped to the resource - element group represented by Among them, the starting offset position is the number of occupied REs.

[0205] It should be noted that a REG consists of 4 consecutive REs within a cell excluding cell-specific reference signals. If a RE is reserved for a cell-specific reference signal (CRS), that RE cannot be used to form a REG. Moreover, the 4 REs belonging to the same REG must be located within the same OFDM symbol.

[0206] Take the 4-port CRS as an example. The corresponding frequency-domain positions are as follows Figure 2 shown.

[0207] PHICH:

[0208] PHICH carries ACK (Acknowledge) and NACK (Non-Acknowledge) information of HARQ (Hybrid Automatic Repeat Request). The base station notifies the UE whether it has correctly received a transmission on the PUSCH through the PHICH channel. The terminal decides whether to retransmit or send new data to the base station according to the information indicated by PHICH, as shown in Figure 3 the following figure.

[0209] Define the PHICH sequence of the i-th group (corresponding to the i-th ∈ {0, 1, 2} REG mapped to antenna port p) as

[0210]

[0211] the sequence z (p) (i) belongs to PHICH group m' (for extended CP, m' = m / 2, where m is the PHICH group index), and the mapped RE (k′, l′) i satisfies the following conditions:

[0212]

[0213] The PHICH duration is configured by the higher-layer parameter phich-duration. For details, refer to Protocol 36.211.

[0214] The frequency-domain index k i ′ and the mapped REG Define n l′ as the number of REGs on OFDM symbol l′ within a subframe that are not allocated to PCFICH. If the higher-layer parameter phich-duration indicates the normal CP scenario,

[0215]

[0216] Among them, under the extended PHICH duration in the MBSFN subframe of the scenario, or the extended PHICH duration in subframes 1 and 6 of frame structure type 2, or the extended PHICH duration in the subframe with the same DwPTS duration as the special subframe configuration in frame structure type 3, the corresponding REG index:

[0217]

[0218] Using TDD (Time Division Duplex) extended PHICH duration, m i = 1 (uplink-downlink configuration = 0, subframe 0), Among them, N g = 2, 4-port CRS, the corresponding time domain positions of PHICH are as follows:

[0219] l′0 = 0,

[0220] l′1 = 1,

[0221] l′2 = 2,

[0222] The frequency domain positions are as follows:

[0223] When m' = 0,

[0224] When m' = 1,

[0225] …

[0226] When m' = 6,

[0227] The corresponding frequency domain positions of PHICH and PCFICH are as Figure 4 shown.

[0228] PDCCH DMRS:

[0229] Sequence generation

[0230] For the OFDM symbol l within a slot, the corresponding sequence r l (m) is equal to:

[0231]

[0232] c(i) is a pseudo-random sequence, and the initial value is

[0233]

[0234] Among them, is the in-frame slot index, N ID ∈ {0, 1,..., 65535} is configured by the high-layer parameter pdcch-DMRS-ScramblingID, otherwise,

[0235] Resource mapping

[0236]

[0237] Sequence r l (m) is mapped to the resource element (k, l) p,μ , and the following rules should be followed:

[0238]

[0239]

[0240] k′ = 0, 1, 2

[0241] n = 0, 1,...

[0242] Among them, is the transmission power parameter, k is the subcarrier index within the OFDM symbol, l is the symbol index within the slot, and the antenna port p = 2000.

[0243] Based on the above formula, within the RB where the PDCCH DMRS exists, the DMRS is transmitted on the 1st, 5th, and 9th subcarriers within an RB.

[0244] When the NR PDCCH DMRS conflicts with the LTE CRS RE, the NR PDCCH DMRS RE is shifted in the frequency domain until there is no conflict with the said LTE CRS for rate matching around the CRS, but the DMRS for PDSCH demodulation still cannot have any conflict with the CRS, as Figure 5A shown:

[0245] As described above, PHICH and PCFICH are essential cell-level control channels of LTE. Similar to CRS, they also cause strong interference to NR PDCCH DMRS. In the scenario where PHICH and / or PCFICH exist, if based on the existing mechanism, NR PDCCH DMRS avoids conflicts by shifting in the frequency-domain REs. In the scenario where PCFICH and / or PHICH coexist with CRS, DMRS may need to be offset by multiple REs, corresponding to a relatively large channel estimation error of DMRS on this RE, as Figure 5B shown.

[0246] On the OFDM symbol transmitting LTE CRS, DMRS transmission may not be carried out, and DMRS is only transmitted on the symbol without LTE CRS. This scenario is applicable to the scenario where there is a symbol without transmitting LTE CRS within the time domain range of PDCCH CORESET. For example Figure 6 shown.

[0247] If based on the relevant mechanism, DMRS is only transmitted on the symbol where LTE reference signal is not transmitted. Under the existing mechanism, PDCCH CORESET occupies at most 3 OFDM symbols. In some scenarios, PHICH may occupy all OFDM symbols where CORESET is located, and there is no scenario where CRS is not transmitted on the corresponding symbol within CORESET. For example Figure 7 shown.

[0248] When LTE system and NR system coexist in the same frequency band, the existence of LTE CRS, PCFICH, and PHICH may cause serious interference to PDCCH, thereby severely limiting its capacity and restricting the performance and scheduling flexibility of NR system.

[0249] To solve the above technical problems, the present disclosure provides the following methods and devices for receiving and transmitting signals, as well as storage media.

[0250] First, the method for receiving signals provided by the present disclosure will be introduced from the terminal side.

[0251] An embodiment of the present disclosure provides a method for receiving signals. Referring to Figure 8 shown, Figure 8 is a flowchart of a method for receiving signals shown according to an embodiment, which can be executed by a terminal. The method may include the following steps:

[0252] In step 801, determine the first initial resource element RE corresponding to the first demodulation reference signal DMRS of the downlink control channel PDCCH of the first system.

[0253] In the embodiments of the present disclosure, the first system may be an NR system, the first DMRS may be any DMRS corresponding to the PDCCH of the NR system, and the terminal may determine the first initial RE (Resource Element) based on the DMRS-related mechanism determined by the existing protocol.

[0254] In step 802, determine the second initial RE corresponding to the reference signal of the second system.

[0255] In the embodiments of the present disclosure, the second system may be an LTE system, the reference signal of the second system may be at least one of the CRS, PCFICH, and PHICH of LTE, and the terminal may determine the second initial RE based on the above-mentioned CRS, PCFICH, and PHICH-related mechanisms.

[0256] Wherein, if the reference signal of the second system is PCFICH or PHICH, similar to the CRS, the NR terminal may determine the second initial RE based on the relevant signaling and the 36.211-related mechanism.

[0257] In step 803, based on the first initial RE, determine the candidate REs corresponding to the first DMRS by means of shifting.

[0258] In the embodiments of the present disclosure, when the resources corresponding to the first initial RE and the second initial RE are the same, the terminal may determine the candidate REs by means of shifting. Among them, the same resources include, but are not limited to, the same time-domain resources and frequency-domain resources, and the number of candidate REs may be one or more, which is not limited in the present disclosure.

[0259] In step 804, detect and receive the first DMRS on the available REs among the candidate REs.

[0260] In the embodiments of the present disclosure, the available REs refer to the REs among the candidate REs that are not occupied by other reference signals. Among them, the other reference signals may be any second DMRS different from the first DMRS, or the other reference signals may be the reference signals of the second system, and the reference signals of the second system may be at least one of the CRS, PCFICH, and PHICH of LTE.

[0261] In the above embodiments, the terminal side may determine the candidate REs by means of frequency shifting and / or time-domain shifting, and detect and receive the first DMRS on the available REs among the candidate REs, which can effectively avoid the interference of the reference signals from the LTE system to the DMRS of the NR PDCCH in the DSS scenario, improve the system capacity of the NR PDCCH, and improve the performance of the NR system.

[0262] In some alternative embodiments, refer to Figure 9 as shown.Figure 9 A flowchart of a method for receiving a signal according to an embodiment, which can be executed by a terminal. The method may include the following steps:

[0263] In step 901, determine a first initial resource element (RE) corresponding to a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system.

[0264] In an embodiment of the present disclosure, the first system may be a New Radio (NR) system, and the first DMRS may be any DMRS of the PDCCH of the NR system. The terminal may determine the first initial RE based on the above DMRS-related mechanism.

[0265] In step 902, determine a second initial RE corresponding to a reference signal of a second system.

[0266] In an embodiment of the present disclosure, the second system may be a Long Term Evolution (LTE) system, and the reference signal of the second system may be at least one of a cell-specific reference signal (CRS), a physical control format indicator channel (PCFICH), and a physical hybrid-ARQ indicator channel (PHICH) of LTE. The terminal may determine the second initial RE based on the above CRS, PCFICH, PHICH-related mechanism.

[0267] Wherein, if the reference signal of the second system is PCFICH or PHICH, similar to the CRS, the NR terminal may determine the second initial RE based on relevant signaling and the 36.211-related mechanism.

[0268] In step 903, determine a first moving range by a shifting method based on the first initial RE.

[0269] In step 904, determine the REs located within the first moving range as the candidate REs.

[0270] In an embodiment of the present disclosure, all REs located within the first moving range may be determined as candidate REs.

[0271] In step 905, detect and receive the first DMRS on the available REs among the candidate REs.

[0272] In an embodiment of the present disclosure, the available REs refer to the REs among the candidate REs that are not occupied by other reference signals. Wherein, the other reference signals may be any second DMRS different from the first DMRS, or the other reference signals may be the reference signals of the second system, and the reference signals of the second system may be at least one of the CRS, PCFICH, and PHICH of LTE.

[0273] In the above embodiments, the terminal may determine all the resource elements (REs) within the first moving range as candidate REs, so as to perform rate matching around the reference signal of the LTE system, determine available REs, and detect and receive the first demodulation reference signal (DMRS) on the available REs. In the DSS scenario, interference from the reference signal of the LTE system to the DMRS of the NR physical downlink control channel (PDCCH) can be effectively avoided, while the system capacity of the NR PDCCH is improved and the performance of the NR system is enhanced.

[0274] In some alternative embodiments, referring to Figure 10 as shown in Figure 10 FIG. 7 is a flowchart of a method for receiving a signal according to an embodiment, which can be executed by a terminal. The method may include the following steps:

[0275] In step 1001, determine a first initial resource element (RE) corresponding to a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system.

[0276] In the embodiments of the present disclosure, the first system may be an NR system, and the first DMRS may be any DMRS associated with the PDCCH of the NR system. The terminal may determine the first initial RE based on the above DMRS-related mechanism.

[0277] In step 1002, determine a second initial RE corresponding to a reference signal of a second system.

[0278] In the embodiments of the present disclosure, the second system may be an LTE system, and the reference signal of the second system may be at least one of the LTE common reference signal (CRS), physical control format indicator channel (PCFICH), and physical hybrid ARQ indicator channel (PHICH). The terminal may determine the second initial RE based on the above CRS-, PCFICH-, and PHICH-related mechanisms.

[0279] Wherein, if the reference signal of the second system is the PCFICH or the PHICH, similar to the CRS, the NR terminal may determine the second initial RE based on relevant signaling and the 3GPP TS 36.211-related mechanism.

[0280] In step 1003, based on the first initial RE, perform sequential shifting in a first direction in the frequency domain.

[0281] In the embodiments of the present disclosure, the first direction may be the direction of increasing frequency, or the first direction may be the direction of decreasing frequency. The determination of the first direction may be specified by a protocol, or may be indicated by a base station sending signaling. The present disclosure does not limit this.

[0282] In step 1004, when a first stop shifting condition is satisfied, determine the frequency domain range obtained by shifting in the first direction as the first moving range.

[0283] In the embodiments of the present disclosure, the first stop shifting condition may include that the number of shifted frequency domain resources is equal to a pre-determined maximum number of frequency units.

[0284] The way to pre-determine the maximum number of frequency units delta may be determined based on protocol pre-definition, or may be determined based on signaling indication sent by the base station, or may be determined based on the terminal reported capabilities. The present disclosure does not limit this.

[0285] Optionally, considering that DMRS is transmitted on the 1st, 5th, and 9th sub-carriers within an RB, if the first DMRS is transmitted on the 1st sub-carrier within the RB, the number of REs between the 1st sub-carrier and the 5th sub-carrier may be used as the maximum number of frequency units, that is, the maximum number of frequency units delta is equal to 3.

[0286] In a possible implementation, the terminal performs sequential shifting in the direction of increasing frequency based on the first initial RE, and stops shifting when the number of shifted REs is 3. At this time, the obtained frequency domain range may be determined as the first shifting range.

[0287] It should be noted that the maximum number of frequency units here is the maximum number of REs shifted by the terminal when shifting in the direction of increasing frequency based on the first initial RE. The number of REs that the terminal can shift in the direction of increasing or decreasing frequency may be less than or equal to 3, for example, it may be 1, 2, or 3.

[0288] In a possible implementation, the terminal performs sequential shifting in the direction of decreasing frequency based on the first initial RE, and stops shifting when the number of shifted REs is the maximum number of frequency units. At this time, the obtained frequency domain range may be determined as the first shifting range.

[0289] In step 1005, the REs located within the first shifting range are determined as the candidate REs.

[0290] In step 1006, on the available REs among the candidate REs, the first DMRS is detected and received.

[0291] In the embodiments of the present disclosure, an available RE refers to an RE in the candidate REs that is not occupied by other reference signals. Among them, the other reference signals may be any second DMRS different from the first DMRS, or the other reference signals may be reference signals of a second system. The reference signals of the second system may be at least one of CRS, PCFICH, and PHICH of LTE.

[0292] In a possible implementation, there are multiple available REs among the candidate REs. The terminal may detect and receive the first DMRS on the available RE with the least number of shifted REs when shifting in the first direction based on the first initial RE.

[0293] In a possible implementation, step 1006 may be replaced with 1007 ( Figure 10 not shown in

[0294] In step 1007, it is determined that there is no available RE in the candidate REs, and the first DMRS is not received.

[0295] In the above embodiments, rate matching may be performed around the reference signal of the LTE system, so as to detect and receive the first DMRS on the available REs. If there is no available RE in the candidate REs, the terminal may puncture the first DMRS, that is, the first DMRS is not received. In the DSS scenario, interference from the reference signal of the LTE system to the DMRS of the NR PDCCH is effectively avoided, while the system capacity of the NR PDCCH is improved and the NR system performance is improved.

[0296] In some alternative embodiments, referring to Figure 11 shown in Figure 11 is a flowchart of a method for receiving a signal according to an embodiment, which may be executed by a terminal. The method may include the following steps:

[0297] In step 1101, a first initial resource element RE corresponding to a first demodulation reference signal DMRS of a downlink control channel PDCCH of a first system is determined.

[0298] In the embodiments of the present disclosure, the first system may be an NR system, the first DMRS may be any DMRS of the PDCCH of the NR system, and the terminal may determine the first initial RE based on the above DMRS-related mechanism.

[0299] In step 1102, a second initial RE corresponding to a reference signal of a second system is determined.

[0300] In the embodiments of the present disclosure, the second system may be an LTE system, and the reference signal of the second system may be at least one of the CRS, PCFICH, and PHICH of LTE. The terminal may determine the second initial RE based on the above CRS, PCFICH, and PHICH-related mechanisms.

[0301] Wherein, if the reference signal of the second system is PCFICH or PHICH, similar to the CRS, the terminal may determine the second initial RE based on the relevant signaling and the 36.211-related mechanism.

[0302] In step 1103, based on the first initial RE, a sequential shift is performed in the first direction in the frequency domain.

[0303] In an embodiment of the present disclosure, the first direction may be the direction of increasing frequency, or the first direction may be the direction of decreasing frequency. The determination of the first direction may be agreed upon by a protocol, or may be indicated by a signaling sent by a base station. The present disclosure does not limit this.

[0304] In step 1104, when the first stop shifting condition is satisfied, based on the first initial RE, sequential shifting is performed in the frequency domain in the second direction.

[0305] In an embodiment of the present disclosure, the first stop shifting condition may include that the number of frequency domain resources moved is equal to a pre-determined maximum number of frequency units.

[0306] In a possible implementation, the way to pre-determine the maximum number of frequency units may be determined based on protocol pre-definition, or may be determined based on a signaling indication sent by a base station, or may also be determined based on the terminal reported capabilities. The present disclosure does not limit this. Optionally, the maximum number of frequency units may be equal to 3.

[0307] In an embodiment of the present disclosure, if the terminal performs sequential shifting in the first direction and satisfies the first stop shifting condition, the terminal may perform sequential shifting in the frequency domain in the second direction based on the first initial RE. Wherein, the first direction is the direction of increasing frequency, the second direction is the direction of decreasing frequency, or the first direction is the direction of decreasing frequency, and the second direction is the direction of increasing frequency.

[0308] In step 1105, when the first stop shifting condition is satisfied again, the frequency domain range obtained by shifting in the first direction and the second direction is determined as the first moving range.

[0309] In an embodiment of the present disclosure, the frequency domain ranges obtained by shifting between the above two directions are both determined as the first moving range.

[0310] For example, DMRS is transmitted on the 1st, 5th, and 9th subcarriers within an RB. The first initial RE index corresponding to the first DMRS is 5. Shifting is performed in the direction of increasing frequency until the RE with index 8, and starting from index 5, shifting is performed in the direction of decreasing frequency until the RE with index 2. The frequency domain ranges corresponding to these REs can all be used as the first shifting range.

[0311] In step 1106, the REs located within the first moving range are determined as the candidate REs.

[0312] In step 1107, on the available REs among the candidate REs, the first DMRS is detected and received.

[0313] In the embodiments of the present disclosure, the available REs refer to the REs among the candidate REs that are not occupied by other reference signals, where the other reference signals may be any second DMRS different from the first DMRS, or the other reference signals may be the reference signals of the second system, and the reference signals of the second system may be at least one of the CRS, PCFICH, and PHICH of LTE.

[0314] In a possible implementation, there are multiple available REs among the candidate REs, and the terminal may detect and receive the first DMRS on the available REs determined in the fourth direction. Among them, the fourth direction is the shifting direction with the largest number of available REs determined among the first direction and the second direction.

[0315] Further, the terminal may detect and receive the first DMRS on the available RE that is shifted from the first initial RE in the fourth direction and has the least number of shifted REs.

[0316] For example, if the number of available REs determined in the first direction is 1 and the number of available REs determined in the second direction is 2, then the fourth direction is the second direction. Further, the terminal may detect and receive the first DMRS on the available RE that is shifted from the first initial RE in the second direction and has the least number of shifted REs.

[0317] In a possible implementation, step 1107 may be replaced by 1108 ( Figure 11 not shown in the figure):

[0318] In step 1108, it is determined that there are no available REs among the candidate REs, and the first DMRS is not received.

[0319] In the above embodiments, rate matching may be performed around the reference signals of the LTE system, so as to detect and receive the first DMRS on the available REs. If there are no available REs among the candidate REs, the terminal may puncture the first DMRS, that is, not receive the first DMRS. In the DSS scenario, interference from the reference signals of the LTE system to the DMRS of the NR PDCCH can be effectively avoided, while the system capacity of the NR PDCCH is improved and the performance of the NR system is improved.

[0320] In some alternative embodiments, with reference to Figure 12A shown in the figure, Figure 12A is a flowchart of a method for receiving a signal according to an embodiment, which may be executed by a terminal. The method may include the following steps:

[0321] In step 1201, determine the first initial resource element RE corresponding to the first demodulation reference signal DMRS of the downlink control channel PDCCH of the first system.

[0322] In an embodiment of the present disclosure, the first system may be an NR system, the first DMRS may be any DMRS of the PDCCH of the NR system, and the terminal may determine the first initial RE based on the above DMRS-related mechanism.

[0323] In step 1202, determine the second initial RE corresponding to the reference signal of the second system.

[0324] In an embodiment of the present disclosure, the second system may be an LTE system, the reference signal of the second system may be at least one of the CRS, PCFICH, and PHICH of LTE, and the terminal may determine the second initial RE based on the above CRS, PCFICH, and PHICH-related mechanisms.

[0325] Wherein, if the reference signal of the second system is PCFICH or PHICH, similar to the CRS, the NR terminal may determine the second initial RE based on the relevant signaling and the 36.211-related mechanism.

[0326] In step 1203, based on the first initial RE, perform sequential shifting in the first direction in the frequency domain.

[0327] In an embodiment of the present disclosure, the first direction may be the direction of increasing frequency, or the first direction may be the direction of decreasing frequency. The determination of the first direction may be agreed upon by the protocol, or may be indicated by the base station sending signaling, and the present disclosure does not limit this.

[0328] In step 1204, when the first stop shifting condition is satisfied, perform sequential shifting in the second direction in the frequency domain based on the first initial RE.

[0329] In an embodiment of the present disclosure, the first stop shifting condition may include that the number of frequency domain resources moved is equal to the pre-determined maximum frequency resource number.

[0330] In a possible implementation, the maximum frequency resource number delta may be determined based on protocol pre-definition, or may be determined based on the signaling indication sent by the base station, or may also be determined based on the terminal reported capability. Optionally, the maximum frequency resource number delta may be equal to 3.

[0331] In an embodiment of the present disclosure, if the terminal performs sequential shifting in the first direction and the first stop shifting condition is satisfied, the terminal may perform sequential shifting in the second direction in the frequency domain based on the first initial RE. Wherein, the first direction is the direction of increasing frequency and the second direction is the direction of decreasing frequency, or the first direction is the direction of decreasing frequency and the second direction is the direction of increasing frequency.

[0332] In step 1205, when the first stop shifting condition is satisfied again, shift one time unit in the third direction in the time domain.

[0333] In the embodiments of the present disclosure, the third direction is the direction in which the time unit increases.

[0334] In step 1206, continue to shift according to the shifting order of the first direction, the second direction, and the third direction.

[0335] In the embodiments of the present disclosure, after the terminal shifts one time unit in the third direction in the time domain, based on the first initial RE, the terminal can perform sequential shifting in the first direction in the frequency domain corresponding to the shifted time unit. When the first stop shifting condition is satisfied, the terminal can perform sequential shifting in the second direction in the frequency domain corresponding to the shifted time unit. When the first stop shifting condition is satisfied again, the terminal continues to shift one time unit in the third direction in the time domain. The first stop shifting condition includes that the number of shifted frequency domain resources is equal to the number of frequency domain resources occupied by the control resource set where the first DMRS is located.

[0336] Based on the above process, shifting is continuously performed in the order of frequency domain first and then time domain.

[0337] In step 1207, when the shifting in the third direction satisfies the second stop shifting condition, determine the frequency domain range obtained by shifting in the first direction and the second direction and the time domain range obtained by shifting in the third direction as the first moving range.

[0338] In the embodiments of the present disclosure, the second stop shifting condition includes that the number of shifted time units is equal to the pre-determined maximum number of time units.

[0339] In a possible implementation, the maximum number of time units can be predefined based on the protocol, or determined based on the signaling indication sent by the base station, or can be determined based on the reported capabilities of the terminal. The present disclosure does not limit this.

[0340] In a possible implementation, the maximum number of time units can be the number of time units occupied by the control resource set CORESET where the first DMRS is located. It should be noted that when the terminal shifts in the third direction, the number of shifted time units can be less than or equal to the maximum number of time units.

[0341] In step 1208, determine the REs located within the first moving range as the candidate REs.

[0342] In step 1209, detect and receive the first DMRS on the available REs among the candidate REs.

[0343] In the embodiments of the present disclosure, the available REs refer to the REs among the candidate REs that are not occupied by other reference signals, where the other reference signals can be any second DMRS different from the first DMRS, or the other reference signals can be the reference signals of the second system, and the reference signals of the second system can be at least one of the CRS, PCFICH, and PHICH of LTE.

[0344] In a possible implementation, the candidate REs include multiple available REs. The terminal can detect and receive the first DMRS on the available REs determined in the fourth direction. Wherein, the fourth direction is the frequency-domain shift direction with the largest number of determined available REs. Further, the terminal can detect and receive the first DMRS on the available RE with the least number of REs shifted in the fourth direction based on the first initial RE.

[0345] For example, if the number of available REs determined in the first direction is 1 and the number of available REs determined in the second direction is 2, then the fourth direction is the second direction. Further, the terminal can detect and receive the first DMRS on the available RE with the least number of REs shifted in the second direction based on the first initial RE.

[0346] In a possible implementation, step 1209 can be replaced by 1210 ( Figure 12A not shown in the figure):

[0347] In step 1210, it is determined that there are no available REs among the candidate REs, and the first DMRS is not received.

[0348] In the above embodiments, rate matching can be performed around the reference signals of the LTE system, so as to detect and receive the first DMRS on the available REs. If there are no available REs among the candidate REs, the terminal can puncture the first DMRS, that is, not receive the first DMRS. In the DSS scenario, the interference from the reference signals of the LTE system to the DMRS of the NR PDCCH can be effectively avoided, and at the same time, the system capacity of the NR PDCCH is improved, and the performance of the NR system is improved.

[0349] In some embodiments, as shown in Figure 12B shown, Figure 12B is a flowchart of a method for receiving a signal shown according to an embodiment, which can be executed by a terminal. The method may include the following steps:

[0350] In step 1201', determine the first initial resource element RE corresponding to the first demodulation reference signal DMRS of the downlink control channel PDCCH of the first system.

[0351] In an embodiment of the present disclosure, the first system may be an NR system, the first DMRS may be any DMRS of the PDCCH of the NR system, and the terminal may determine the first initial RE based on the above DMRS-related mechanism.

[0352] In step 1202', determine the second initial RE corresponding to the reference signal of the second system.

[0353] In an embodiment of the present disclosure, the second system may be an LTE system, the reference signal of the second system may be at least one of the CRS, PCFICH, and PHICH of LTE, and the terminal may determine the second initial RE based on the above CRS, PCFICH, and PHICH-related mechanisms.

[0354] Wherein, if the reference signal of the second system is PCFICH or PHICH, similar to the CRS, the NR terminal may determine the second initial RE based on the relevant signaling and the 36.211-related mechanism.

[0355] In step 1203', based on the first initial RE, perform sequential shifting in the first direction in the frequency domain.

[0356] In an embodiment of the present disclosure, the first direction may be the direction of increasing frequency, or the first direction may be the direction of decreasing frequency. The determination of the first direction may be agreed upon by the protocol, or may be indicated by the base station sending signaling. The present disclosure does not limit this.

[0357] In step 1204', when the first stop shifting condition is met, move one time unit in the third direction in the time domain based on the first initial RE.

[0358] In an embodiment of the present disclosure, the first stop shifting condition may include that the number of frequency domain resources moved is equal to the pre-determined maximum number of frequency resources.

[0359] In a possible implementation, the way to pre-determine the maximum number of frequency resources delta may be determined based on protocol pre-definition, or may be determined based on the signaling indication sent by the base station, or may also be determined based on the terminal reported capability. The present disclosure does not limit this. Optionally, the maximum number of frequency resources delta may be equal to 3.

[0360] Wherein, the first direction is the direction of increasing frequency, or the first direction is the direction of decreasing frequency. The third direction is the direction of increasing time unit.

[0361] In step 1205, continue to perform shifting according to the shifting order of the first direction and the third direction.

[0362] In an embodiment of the present disclosure, after the terminal moves one time unit in the third direction in the time domain, based on the first initial RE, the terminal sequentially shifts in the first direction in the frequency domain corresponding to the moved time unit. When the first stop shifting condition is satisfied, the terminal can continue to move one time unit in the third direction in the time domain. The first stop shifting condition includes that the number of frequency domain resources moved is equal to the maximum number of frequency domain resources.

[0363] Based on the above process, the shifting is continuously performed in the order of frequency domain first and then time domain.

[0364] In step 1206’, when the shifting in the third direction satisfies the second stop shifting condition, the frequency domain range obtained by shifting in the first direction and the time domain range obtained by shifting in the third direction are determined as the first moving range.

[0365] In an embodiment of the present disclosure, the second stop shifting condition includes that the number of time units moved is equal to the pre-determined maximum number of time units.

[0366] In a possible implementation, the method for pre-determining the maximum number of time units can be based on protocol pre-definition, or determined based on the signaling indication sent by the base station, or can be determined based on the reported capabilities of the terminal. The present disclosure does not limit this.

[0367] In a possible implementation, the maximum number of time units can be the number of time units that the control resource set CORESET where the first DMRS is located lasts. It should be noted that when the terminal shifts in the third direction, the number of time units moved can be less than or equal to the maximum number of time units.

[0368] In step 1207’, the REs located within the first moving range are determined as the candidate REs.

[0369] In step 1208’, on the available REs among the candidate REs, the first DMRS is detected and received.

[0370] In an embodiment of the present disclosure, the available REs refer to the REs in the candidate REs that are not occupied by other reference signals. Among them, the other reference signals can be any second DMRS different from the first DMRS, or the other reference signals can be the reference signals of the second system. The reference signals of the second system can be at least one of the CRS, PCFICH, and PHICH of LTE.

[0371] In a possible implementation, the candidate REs include multiple available REs, and the terminal may detect and receive the first DMRS on the available REs determined in the fourth direction. The fourth direction is the frequency-domain shift direction with the largest number of determined available REs. Further, the terminal may detect and receive the first DMRS on the available RE with the least number of shifted REs when shifting from the first initial RE in the fourth direction.

[0372] For example, if the number of available REs determined in the first direction is 1 and the number of available REs determined in the second direction is 2, then the fourth direction is the second direction. Further, the terminal may detect and receive the first DMRS on the available RE with the least number of shifted REs when shifting from the first initial RE in the second direction.

[0373] In a possible implementation, step 1208’ may be replaced by 1209’ ( Figure 12B not shown in the figure):

[0374] In step 1209’, it is determined that there are no available REs in the candidate REs, and the first DMRS is not received.

[0375] In the above embodiments, rate matching may be performed around the reference signal of the LTE system, so as to detect and receive the first DMRS on the available REs. If there are no available REs in the candidate REs, the terminal may puncture the first DMRS, that is, not receive the first DMRS. In the DSS scenario, interference from the reference signal of the LTE system to the DMRS of the NR PDCCH is effectively avoided, while the system capacity of the NR PDCCH is improved and the NR system performance is improved.

[0376] In the above embodiments, rate matching may be performed around the reference signal of the LTE system, so as to detect and receive the first DMRS on the available REs. If there are no available REs in the candidate REs, the terminal may puncture the first DMRS, that is, not receive the first DMRS. In the DSS scenario, interference from the reference signal of the LTE system to the DMRS of the NR PDCCH is effectively avoided, while the system capacity of the NR PDCCH is improved and the NR system performance is improved.

[0377] In some embodiments, the above maximum frequency unit number delta may be greater than 0 or less than 0, and the first direction may be represented by the positive or negative of delta. For example, when delta is greater than 0, the first direction is the direction of increasing frequency, and when delta is less than 0, the first direction is the direction of decreasing frequency.

[0378] In some embodiments, the time unit in the third direction may be an OFDM symbol. When determining the first moving range, the smaller the OFDM index value, the higher the priority.

[0379] In the above embodiments, the terminal determines candidate resource elements (REs) by shifting, and then detects and receives the first demodulation reference signal (DMRS) on the available REs among the candidate REs. If there are no available REs among the candidate REs, the terminal does not receive the first DMRS. In addition to the above method, the present disclosure also provides another method for receiving a signal.

[0380] Embodiments of the present disclosure provide a method for receiving a signal. Referring to Figure 13 as shown in Figure 13 FIG. 10 is a flowchart of a method for receiving a signal according to an embodiment, which may be executed by a terminal. The method may include the following steps:

[0381] In step 1301, determine a first initial resource element (RE) where a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system is located.

[0382] In embodiments of the present disclosure, the first system may be a New Radio (NR) system, and the first DMRS may be any DMRS of the PDCCH of the NR system. The terminal may determine the first initial RE based on the above DMRS-related mechanism.

[0383] In step 1302, determine a second initial RE where a reference signal of a second system is located.

[0384] In embodiments of the present disclosure, the second system may be a Long Term Evolution (LTE) system, and the reference signal of the second system may be at least one of the LTE cell-specific reference signal (CRS), physical control format indicator channel (PCFICH), and physical hybrid ARQ indicator channel (PHICH). The terminal may determine the second initial RE based on the above CRS, PCFICH, and PHICH-related mechanisms.

[0385] Wherein, if the reference signal of the second system is the PCFICH or the PHICH, similar to the CRS, the NR terminal may determine the second initial RE based on relevant signaling and the 3GPP TS 36.211-related mechanism.

[0386] In step 1303, determine available REs.

[0387] In embodiments of the present disclosure, the first initial RE and the second initial RE correspond to the same resources, and the available REs are not occupied by other reference signals within a first frequency domain range corresponding to the PDCCH. The other reference signals include a second DMRS or the reference signal of the second system.

[0388] Among them, the first frequency domain range may be the BWP frequency domain range where the PDCCH is located, or the first frequency domain range may be an RB (Resource Block) range within the frequency domain range where the PDCCH is located, or the first frequency domain range may be the CORESET frequency domain range corresponding to the PDCCH.

[0389] In step 1304, on the available REs, detect and receive the first DMRS.

[0390] It should be noted that the frequency domain resources corresponding to the PDCCH are composed of multiple RBs. In the present disclosure, any RB is used as a unit for description. On the available REs of this RB, detect and receive the first DMRS.

[0391] In the above embodiments, the terminal can directly determine the available REs, and detect and receive the first DMRS on the available REs, perform rate matching around the reference signal of the LTE system, effectively avoid the interference of the reference signal of the LTE system on the DMRS of the NR PDCCH in the DSS scenario, and at the same time improve the system capacity of the NR PDCCH and improve the NR system performance.

[0392] In some alternative embodiments, refer to Figure 14 as shown in Figure 14 is a flowchart of a method for receiving a signal according to an embodiment, which can be executed by a terminal. The method may include the following steps:

[0393] In step 1401, determine the first initial resource element RE where the first demodulation reference signal DMRS of the downlink control channel PDCCH of the first system is located.

[0394] In the embodiments of the present disclosure, the first system may be an NR system, the first DMRS may be any DMRS of the PDCCH of the NR system, and the terminal may determine the first initial RE based on the above DMRS-related mechanism.

[0395] In step 1402, determine the second initial RE where the reference signal of the second system is located.

[0396] In the embodiments of the present disclosure, the second system may be an LTE system, and the reference signal of the second system may be at least one of the LTE CRS, PCFICH, and PHICH. The terminal may determine the second initial RE based on the above CRS, PCFICH, and PHICH-related mechanisms.

[0397] Among them, if the reference signal of the second system is PCFICH or PHICH, similar to the CRS, the NR terminal may determine the second initial RE based on the relevant signaling and the 36.211-related mechanism.

[0398] In step 1403, within the first frequency domain range, determine the first ratio of the occupied second initial REs.

[0399] Wherein, the first frequency domain range may be the BWP frequency domain range where the PDCCH is located, or the first frequency domain range may be an RB range within the frequency domain range where the PDCCH is located, or the first frequency domain range may be the CORESET frequency domain range corresponding to the PDCCH.

[0400] It should be noted that the frequency domain resources corresponding to the PDCCH are composed of multiple RBs. In the present disclosure, any one of the RBs is used as a unit for description. On the available REs of this RB, detect and receive the first DMRS.

[0401] In a possible implementation, the ratio of the number of the second initial REs to the total number of REs included in the first frequency domain range may be determined, so as to obtain the first ratio.

[0402] In step 1404, based on the first ratio, determine the available RE index set.

[0403] In the embodiments of the present disclosure, there is a preset corresponding relationship between the first ratio and the available RE index set.

[0404] The corresponding relationship between different first ratios α and different available RE index sets may be predefined through a protocol.

[0405] The terminal may determine the available RE index value corresponding to the first ratio according to the above corresponding relationship.

[0406] In step 1405, remove the second initial REs within the first frequency domain range to obtain a candidate RE set.

[0407] In step 1406, based on the available RE index set, determine the available REs in the candidate RE set.

[0408] In the embodiments of the present disclosure, each RE in the candidate RE set may be renumbered in ascending order according to the corresponding index, and the index value of each RE in the candidate RE set may be determined. For example, the candidate RE set is {1, 2, 4, 5, 7, 8, 10, 11}, and the renumbered candidate RE set is {0, 1, 2, 3, 4, 5, 6, 7}.

[0409] Furthermore, the terminal may determine the REs indicated by the available RE index set as the available REs in the candidate RE set. For example, if the available RE index is {1, 4, 7}, the terminal determines the REs with indexes {1, 4, 7} in the candidate RE set as the available REs.

[0410] It should be noted here that the available REs indicated by the RE index are the REs in the candidate RE set after re - numbering each RE according to the index. Taking the available RE indices as {1, 4, 7} as an example, the REs in the candidate RE set with indices {2, 7, 11} (re - numbered to {1, 4, 7}) before re - numbering are determined as available REs.

[0411] In step 1407, on the available REs, the first DMRS is detected and received.

[0412] In the above - mentioned embodiments, the terminal can determine the available REs according to the proportion of the second initial REs in the first frequency - domain range, effectively avoiding the interference of the reference signals from the LTE system on the DMRS of the NR PDCCH in the DSS scenario, while improving the system capacity of the NR PDCCH and enhancing the performance of the NR system.

[0413] Next, the method for transmitting signals provided by the present disclosure will be introduced from the base - station side.

[0414] Embodiments of the present disclosure provide a method for transmitting signals. Refer to Figure 15 as shown Figure 15 is a flowchart of a method for transmitting signals shown according to an embodiment, which can be executed by a base station. The method may include the following steps:

[0415] In step 1501, determine the first initial resource element RE where the first demodulation reference signal DMRS of the physical downlink control channel PDCCH of the first system is located.

[0416] The way for the base station to determine the first initial RE is similar to that on the terminal side and will not be elaborated here.

[0417] In step 1502, determine the second initial RE where the reference signal of the second system is located.

[0418] The way for the base station to determine the second initial RE is similar to that on the terminal side and will not be elaborated here.

[0419] In step 1503, based on the first initial RE, determine the candidate REs corresponding to the first DMRS by means of shifting.

[0420] Among them, the resources corresponding to the first initial RE and the second initial RE are the same.

[0421] In step 1504, transmit the first DMRS on the available REs among the candidate REs.

[0422] Among them, the available REs are not occupied by other reference signals, and the other reference signals are the second DMRS or the reference signals of the second system.

[0423] In the above embodiments, the base station can determine the first shifting range through a shifting method, determine the REs within the first shifting range as candidate REs, and transmit the first DMRS on the available REs among the candidate REs. In the DSS scenario, it can effectively avoid the interference of the reference signal from the LTE system to the DMRS of the NR PDCCH, improve the system capacity of the NR PDCCH, and improve the performance of the NR system.

[0424] In some alternative embodiments, the base station can first determine the first shifting range through a shifting method based on the first initial RE, and determine the REs located within the first shifting range as the candidate REs.

[0425] The method for determining the first shifting range includes any one of the following:

[0426] Method 1: Based on the first initial RE, perform sequential shifting in the first direction in the frequency domain. When the first stop shifting condition is met, determine the frequency domain range obtained by shifting in the first direction as the first shifting range.

[0427] The specific implementation method is similar to that of the terminal side Figure 10 shown in the embodiments, and will not be elaborated here.

[0428] Method 2: Based on the first initial RE, perform sequential shifting in the first direction in the frequency domain. When the first stop shifting condition is met, based on the first initial RE, perform sequential shifting in the second direction in the frequency domain. When the first stop shifting condition is met again, determine the frequency domain range obtained by shifting in the first direction and the second direction as the first shifting range.

[0429] The specific implementation method is similar to that of the terminal side Figure 11 shown in the embodiments, and will not be elaborated here.

[0430] Method 3: Based on the first initial RE, perform sequential shifting in the first direction in the frequency domain; when the first stop shifting condition is met, based on the first initial RE, perform sequential shifting in the second direction in the frequency domain; when the first stop shifting condition is met again, move one time unit in the third direction in the time domain based on the first initial RE; continue to perform shifting in the shifting order of the first direction, the second direction, and the third direction; when the shifting in the third direction meets the second stop shifting condition, determine the frequency domain range obtained by shifting in the first direction and the second direction and the time domain range obtained by shifting in the third direction as the first shifting range.

[0431] The specific implementation method is similar to that of the terminal side Figure 12A or Figure 12BThe implementation manners of the illustrated embodiments are similar and will not be described herein again.

[0432] An embodiment of the present disclosure provides a method for transmitting a signal. Referring to Figure 16 as shown, Figure 16 FIG. is a flowchart of a method for transmitting a signal according to an embodiment, which can be executed by a base station. The method may include the following steps:

[0433] In step 1601, determine a first initial resource element (RE) where a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system is located.

[0434] In step 1602, determine a second initial RE where a reference signal of a second system is located;

[0435] In step 1603, determine available REs.

[0436] Wherein, the first initial RE and the second initial RE correspond to the same resources, and the available REs are not occupied by other reference signals within a first frequency domain range corresponding to the PDCCH. The other reference signals include a second DMRS or the reference signal of the second system;

[0437] In step 1604, transmit the first DMRS on the available REs.

[0438] The specific implementation manner is similar to that of the illustrated embodiment on the terminal side Figures 13 to 14 and will not be described herein again.

[0439] In the above embodiment, the base station can directly determine available REs based on a first ratio occupied by the second initial RE within a first frequency domain range, and transmit the first DMRS on the available REs. In a DSS scenario, interference from the reference signal of the LTE system to the DMRS of the NR PDCCH can be effectively avoided, while the system capacity of the NR PDCCH is improved and the performance of the NR system is improved.

[0440] To facilitate understanding of the above method provided by the present disclosure, the above methods for receiving and transmitting signals are further illustrated by examples as follows.

[0441] Embodiment 1. Assume that the NR system and the LTE system transmit on the same frequency band. At this time, the LTE CRS needs to be continuously transmitted. At the same time, the LTE PHICH and PCFICH are also transmitted. Hereinafter, the LTE RS is used to represent one or more of the LTE CRS, PHICH, PCFICH, or other LTE transmission signals, and will not be described herein again.

[0442] In this embodiment, the base station transmits the NR PDCCH and the corresponding demodulation reference signal DMRS on the OFDM symbol where the LTE RS exists, and there is an intersection in the frequency domain between the LTE RS and the NR PDCCH. The time-frequency domain position of the LTE RS is notified to the terminal by the base station through RRC signaling, or the terminal determines it by other means. In the schematic diagrams of this embodiment, the PCI (Physical Cell Identifier) is equal to 0 as an example to illustrate the specific solution of the present invention.

[0443] In this embodiment, the first parameter value delta can be configured by signaling, determined by a predefined method, or determined based on the terminal-reported capabilities. Exemplarily, delta = 3, or delta = -3. Delta is an integer, which can be greater than 0 or less than 0. Whether delta is greater than 0 or less than 0 can be associated with the direction of frequency shift. Exemplarily, delta > 0 corresponds to the first aspect as the direction of frequency increase, and delta < 0 corresponds to the first aspect as the direction of frequency decrease.

[0444] A possible implementation manner is that when the NR PDCCH DMRS conflicts with the LTE RS RE, that is, the first initial RE and the second initial RE correspond to the same resource, shift in the frequency domain based on the first initial RE until the first DMRS has no conflict with the LTE RS. It can be shifted in the direction of frequency increase. If there is still a conflict with the LTE RS / other NR PDCCH DMRS after shifting delta (or |delta|) REs, puncture the first DMRS, that is, the terminal side does not receive the first DMRS, and the base station does not send the first DMRS. For example Figure 17A as shown.

[0445] A possible implementation manner is that the first DMRS conflicts with the reference signal of the second system, that is, the first initial RE and the second initial RE correspond to the same resource. Shift in the frequency domain based on the first initial RE until there is no conflict with the LTE RS. It can be shifted in the direction of frequency decrease. If there is still a conflict with the LTE RS / other NR PDCCH DMRS after shifting delta (or |delta|) REs, puncture the first DMRS, that is, the terminal side does not receive the first DMRS, and the base station does not send the first DMRS.

[0446] A possible implementation. When the first DMRS conflicts with the reference signal of the second system, that is, the first initial RE corresponds to the same resource as the second initial RE, shift the first initial RE in the direction of increasing frequency in the frequency domain until there is no conflict with the LTE RS. If there is still a conflict with the LTE RS / second DMRS after shifting by delta (or |delta|) REs, shift the first initial RE in the direction of decreasing frequency until there is no conflict with the LTE RS. If there is still a conflict with the LTE RS / other NR PDCCH DMRS after shifting by delta (or |delta|) REs, puncture the above first DMRS.

[0447] A possible implementation. To ensure the joint channel estimation of the DMRS in the time domain, within the duration of the OFDM symbols of the PDCCH CORESET, the RE index corresponding to the DMRS transmission is the same, that is: for the DMRS with the same first initial RE index as the first DMRS, perform the same shift operation in the frequency domain, as Figure 17B shown.

[0448] It should be noted that the position of the first initial RE corresponding to the first DMRS in the present disclosure refers to the time-frequency domain position determined based on the existing protocol, which will not be elaborated hereinafter.

[0449] By defining the parameter delta to determine the frequency domain shifting method of the NR DMRS, it is ensured that when sending the NR PDCCH on the LTE CRS symbol, there will be no loss of useful information, and the decoding performance of the PDCCH is ensured. At the same time, considering that the DMRS is mainly used for channel estimation within a certain RE range, if it is determined that there is no condition for transmitting the PDCCH in the frequency domain range where it is located, the first DMRS can be discarded.

[0450] In Embodiment 1, the frequency domain range determined by shifting in the first direction can also be used as the first moving range, and the REs within the first moving range are determined as candidate REs, and then the first DMRS is detected and received on the available REs among the candidate REs, and the first DMRS is sent on the available REs among the candidate REs by the base station side. That is, it does not detect whether there are available REs before determining the first moving range.

[0451] In the above embodiments, on the basis of ensuring the PDCCH performance, the waste of PDCCH DMRS transmission is avoided.

[0452] Embodiment 2. Assume that the NR system and the LTE system transmit on the same frequency band. At this time, the LTE CRS needs to be continuously transmitted. At the same time, the LTE PHICH / PCFICH is also transmitted. Hereinafter, LTE RS is used to represent one or more of LTE CRS, PHICH, PCFICH, or other LTE transmission signals, and details will not be described herein again.

[0453] In this embodiment, the base station transmits the NR PDCCH and the corresponding demodulation reference signal DMRS on the OFDM symbol where the LTE RS exists, and there is an intersection in the frequency domain between the LTE RS and the NR PDCCH. And the time-frequency domain position of the LTE RS is notified to the terminal by the base station through RRC signaling, or the terminal determines it by other means. In the schematic diagrams of this embodiment, the PCI is equal to 0 as an example to illustrate the specific solution of the present invention.

[0454] Based on the parameter delta determined in Embodiment 1, when the first DMRS conflicts with the reference signal of the second system, the time-frequency domain position of the DMRS transmission can also be determined in the order of frequency domain first and then time domain.

[0455] A possible implementation manner includes:

[0456] Step 1: Perform a shift in the frequency domain based on the first initial RE. The frequency domain shift can be shifted to a higher RE index, or shifted to a lower RE index. It can also be first shifted in the direction of increasing frequency. After shifting delta REs, if the RE that satisfies not conflicting with the LTE RS or other DMRS REs has not been determined yet, then shift in the direction of decreasing frequency. The specific method is the same as that in Embodiment 1 and will not be described herein again.

[0457] Step 2: Based on the first initial RE, move one time unit in the third direction in the time domain.

[0458] The third direction is the direction of increasing time unit.

[0459] Step 3: Continue to perform the shift according to the shift order of the first direction, the second direction, and the third direction.

[0460] A possible implementation manner is that for different DMRSs corresponding to the same terminal, the above DMRS conflict handling mechanism is executed one by one in the order of increasing frequency domain RE index and increasing time domain OFDM symbol index. For the same RE, the priority of the DMRS transmitted at this position is associated with the order of conflict handling.

[0461] The first moving range can be determined in the above manner, and all the REs within the first moving range are determined as candidate REs. The available REs are determined from the candidate REs. The terminal side detects and receives the first DMRS on the available REs, and the base station side transmits the first DMRS on the available REs.

[0462] Exemplarily, a possible implementation scenario is as Figure 18 shown.

[0463] By defining the parameter delta to determine the frequency-domain shift and time-domain shift methods of the NR DMRS, it is ensured that when transmitting the NR PDCCH on the LTE CRS symbol, no loss of useful information will occur, and the decoding performance of the PDCCH is ensured. At the same time, considering that the first DMRS is mainly used for channel estimation within a certain RE range, if it is determined that there are no conditions for transmitting the PDCCH in the frequency-domain range where it is located, the first DMRS can be discarded. The above embodiments also avoid waste in the transmission of the PDCCH DMRS while ensuring the performance of the PDCCH.

[0464] It should also be noted that it is also possible to determine whether there are available REs during the process of determining the first moving range. Once available REs are determined, the determination of the first moving range can be stopped, and the first DMRS can be received or transmitted on these available REs.

[0465] Embodiment 3. Assume that the NR system and the LTE system transmit on the same frequency band. At this time, the LTE CRS needs to be continuously transmitted. At the same time, the LTE PHICH and PCFICH are also transmitted. Hereinafter, the LTE RS is used to represent one or more of the LTE CRS, PHICH, PCFICH, or other LTE transmission signals, and details will not be described herein again.

[0466] In this embodiment, the base station transmits the NR PDCCH and the corresponding modulation and demodulation signal DMRS on the OFDM symbols where the LTE RS exists, and there is an intersection in the frequency domain between the LTE RS and the NR PDCCH. The time-frequency domain position of the LTE RS is notified to the terminal by the base station through RRC signaling, or the terminal determines it by other means. In the schematic diagrams of this embodiment, the PCI is equal to 0 is taken as an example to illustrate the specific solution of the present invention.

[0467] In this embodiment, the available REs are determined based on the proportion of the REs occupied by the LTE RS transmission in the entire RB, that is, the first proportion of the second initial REs in the first frequency domain range. The first proportion is associated with the overhead factor α, and different available RE index sets are flexibly defined. The available RE index sets can be determined based on a predefined method or by signaling indication. The present invention does not limit this.

[0468] Determine the LTE RS overhead factor α, where the factor α (the first ratio) is associated with different available RE index sets. Among them, the DMRS indexes defined by the DMRS pattern are the REs defined by the remaining REs after excluding the RE indexes occupied by the LTE RS. Exemplarily, the correspondence between the factor α and the available RE index set is shown in Table 1, and the corresponding method for determining the available REs is as follows Figure 19 as shown.

[0469] Table 1

[0470]

[0471] Exemplarily, the association relationship between the first ratio and the available RE index set can also be shown in Table 2.

[0472] Table 2

[0473]

[0474] It should be noted that Tables 1 and 2 illustrate the correspondence between the first ratio and the available RE index set by way of example, and other specific contents that can represent the correspondence between the two also fall within the protection scope of the present disclosure.

[0475] Among them, when the first ratio α is 1, it means that all REs within one RB are occupied by reference signals, and there is no position available for transmitting DMRS at this time. Therefore, the available RE index set is empty at this time.

[0476] In addition, the above correspondence can also be determined by signaling indication, and the present invention will not elaborate on this.

[0477] Taking the 2-port CRS as an example, on symbol 0, in one configuration, the CRS is transmitted on 0 and 6, and the corresponding overhead factor is equal to 2 / 12 = 1 / 6. The REs available for transmitting DMRS can be {1, 2, 3, 4, 5, 7, 8, 9, 10, 11}. After renumbering to {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, the corresponding DMRS can be transmitted on the REs corresponding to the indexes 1, 5, and 9. The REs corresponding to 1, 5, and 9 within the RB range are the REs with indexes 2, 7, and 11.

[0478] Embodiment 3 adopts a method similar to rate matching to redefine the available RE index set, which can effectively avoid conflicts with the LTE RS, thereby improving the channel estimation performance and further improving the transmission performance of the PDCCH.

[0479] Corresponding to the foregoing embodiments of the application function implementation method, the present disclosure also provides an embodiment of an application function implementation apparatus.

[0480] Refer toFigure 20 , Figure 20 is a block diagram of a device for receiving a signal shown according to an exemplary embodiment, including:

[0481] A processing module 2001, configured to determine a first initial resource element RE corresponding to a first demodulation reference signal DMRS of a physical downlink control channel PDCCH of a first system;

[0482] The processing module 2001 is further configured to determine a second initial RE corresponding to a reference signal of a second system;

[0483] The processing module 2001 is further configured to determine candidate REs corresponding to the first DMRS in a shifting manner based on the first initial RE; wherein, the resources corresponding to the first initial RE and the second initial RE are the same;

[0484] A receiving module 2002, configured to detect and receive the first DMRS on available REs among the candidate REs; wherein, the available REs are not occupied by other reference signals, and the other reference signals are a second DMRS or the reference signal of the second system.

[0485] Refer to Figure 21 , Figure 21 is a block diagram of a device for receiving a signal shown according to an exemplary embodiment, including:

[0486] A processing module 2101, configured to determine a first initial resource element RE where a first demodulation reference signal DMRS of a physical downlink control channel PDCCH of a first system is located;

[0487] The processing module 2101 is further configured to determine a second initial RE where a reference signal of a second system is located;

[0488] The processing module 2101 is further configured to determine available REs; wherein, the resources corresponding to the first initial RE and the second initial RE are the same, and the available REs are not occupied by other reference signals within a first frequency domain range corresponding to the PDCCH, and the other reference signals include a second DMRS or the reference signal of the second system;

[0489] A receiving module 2102, configured to detect and receive the first DMRS on the available REs.

[0490] Refer to Figure 22 , Figure 22 is a block diagram of a device for transmitting a signal shown according to an exemplary embodiment, including:

[0491] The processing module 2201 is configured to determine a first initial resource element RE where a first demodulation reference signal DMRS of a physical downlink control channel PDCCH of a first system is located;

[0492] The processing module 2201 is further configured to determine a second initial RE where a reference signal of a second system is located;

[0493] The processing module 2201 is further configured to determine candidate REs corresponding to the first DMRS in a shifting manner based on the first initial RE; wherein the resource corresponding to the first initial RE is the same as that corresponding to the second initial RE;

[0494] The transmitting module 2202 is configured to transmit the first DMRS on available REs among the candidate REs; wherein the available REs are not occupied by other reference signals, and the other reference signals are a second DMRS or the reference signal of the second system.

[0495] Refer to Figure 23 , Figure 23 FIG. is a block diagram of a device for transmitting a signal according to an exemplary embodiment, including:

[0496] The processing module 2301 is configured to determine a first initial resource element RE where a first demodulation reference signal DMRS of a physical downlink control channel PDCCH of a first system is located;

[0497] The processing module 2301 is further configured to determine a second initial RE where a reference signal of a second system is located;

[0498] The processing module 2301 is further configured to determine available REs; wherein the resource corresponding to the first initial RE is the same as that corresponding to the second initial RE, and the available REs are not occupied by other reference signals within a first frequency domain range corresponding to the PDCCH, and the other reference signals include a second DMRS or the reference signal of the second system;

[0499] The transmitting module 2302 is configured to transmit the first DMRS on the available REs.

[0500] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to the descriptions of the method embodiments. The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present disclosure solution. Those of ordinary skill in the art can understand and implement it without creative work.

[0501] Correspondingly, the present disclosure also provides a computer-readable storage medium storing a computer program for executing the method of receiving a signal as described in any one of the above.

[0502] Correspondingly, the present disclosure also provides a computer-readable storage medium storing a computer program for executing the method of sending a signal as described in any one of the above.

[0503] Correspondingly, the present disclosure also provides a device for receiving a signal, including:

[0504] a processor;

[0505] a memory for storing instructions executable by the processor;

[0506] wherein the processor is configured to execute the method of receiving a signal as described in any one of the above.

[0507] Figure 24 is a block diagram of a device 2400 for receiving a signal shown according to an exemplary embodiment. For example, the device 2400 can be a mobile phone, a tablet computer, an e-book reader, a multimedia playback device, a wearable device, an in-vehicle user device, an ipad, a smart TV, or other terminals.

[0508] Referring to Figure 24 , the device 2400 may include one or more of the following components: a processing component 2402, a memory 2404, a power component 2406, a multimedia component 2408, an audio component 2410, an input / output (I / O) interface 2412, a sensor component 2416, and a communication component 2418.

[0509] The processing component 2402 generally controls the overall operation of the device 2400, such as operations associated with display, phone calls, data random access, camera operations, and recording operations. The processing component 2402 may include one or more processors 2420 to execute instructions to complete all or part of the steps of the method for receiving signals described above. In addition, the processing component 2402 may include one or more modules to facilitate the interaction between the processing component 2402 and other components. For example, the processing component 2402 may include a multimedia module to facilitate the interaction between the multimedia component 2408 and the processing component 2402. Additionally, the processing component 2402 may read executable instructions from the memory to implement the steps of a method for receiving signals provided in the above embodiments.

[0510] The memory 2404 is configured to store various types of data to support the operation of the device 2400. Examples of such data include instructions for any application or method operating on the device 2400, contact data, phone book data, messages, pictures, videos, etc. The memory 2404 may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, a magnetic disk, or an optical disk.

[0511] The power component 2406 provides power to various components of the device 2400. The power component 2406 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the device 2400.

[0512] The multimedia component 2408 includes a display screen that provides an output interface between the device 2400 and the user. In some embodiments, the multimedia component 2408 includes a front camera and / or a rear camera. When the device 2400 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera may receive external multimedia data. Each of the front camera and the rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0513] The audio component 2410 is configured to output and / or input audio signals. For example, the audio component 2410 includes a microphone (MIC) that is configured to receive external audio signals when the device 2400 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may be further stored in the memory 2404 or transmitted via the communication component 2418. In some embodiments, the audio component 2410 further includes a speaker for outputting audio signals.

[0514] The I / O interface 2412 provides an interface between the processing component 2402 and a peripheral interface module, and the peripheral interface module may be a keyboard, a click wheel, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a power button, and a lock button.

[0515] The sensor component 2416 includes one or more sensors for providing an assessment of the state of various aspects of the device 2400. For example, the sensor component 2416 can detect the on / off state of the device 2400, the relative positioning of components, such as the display and keypad of the device 2400, the sensor component 2416 can also detect a change in the position of the device 2400 or a component of the device 2400, the presence or absence of user contact with the device 2400, the orientation or acceleration / deceleration of the device 2400, and a change in the temperature of the device 2400. The sensor component 2416 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor component 2416 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 2416 may further include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0516] The communication component 2418 is configured to facilitate communication between the device 2400 and other devices in a wired or wireless manner. The device 2400 may access a wireless network based on communication standards, such as Wi-Fi, 2G, 3G, 4G, 5G, or 6G, or a combination thereof. In an exemplary embodiment, the communication component 2418 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 2418 further includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0517] In an exemplary embodiment, the device 2400 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the method of receiving a signal as described in any of the above terminal sides.

[0518] In an exemplary embodiment, a non-transitory machine-readable storage medium including instructions is also provided, such as a memory 2404 including instructions, and the above instructions can be executed by a processor 2420 of a device 2400 to complete the above method of receiving signals. For example, the non-transitory computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0519] Correspondingly, the present disclosure also provides a device for sending signals, including:

[0520] A processor;

[0521] A memory for storing instructions executable by the processor;

[0522] Wherein, the processor is configured to execute any of the above methods for sending signals.

[0523] As Figure 25 shown, Figure 25 is a schematic structural diagram of a device 2500 for sending signals shown according to an exemplary embodiment. The device 2500 may be provided as a base station. Referring to Figure 25 , the device 2500 includes a processing component 2522, a wireless transmit / receive component 2524, an antenna component 2526, and a signal processing part specific to the wireless interface. The processing component 2522 may further include at least one processor.

[0524] One of the processors in the processing component 2522 may be configured to execute any of the above methods for sending signals.

[0525] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not disclosed by the present disclosure. The specification and embodiments are only to be regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0526] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A method for receiving a signal, characterized in that, The method is executed by a terminal and includes: Determining a first initial resource element (RE) corresponding to a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system; Determining a second initial RE corresponding to a reference signal of a second system; Based on the first initial RE, determining candidate REs corresponding to the first DMRS by means of shifting; wherein, the resource corresponding to the first initial RE is the same as that corresponding to the second initial RE; Detecting and receiving the first DMRS on available REs among the candidate REs; wherein, the available REs are not occupied by other reference signals, and the other reference signals are a second DMRS or the reference signals of the second system; wherein, the reference signals of the second system are at least one of a cell-specific reference signal (CRS) of Long Term Evolution (LTE), a physical control format indicator channel (PCFICH), and a physical hybrid automatic repeat request indicator channel (PHICH); wherein, the available REs are the REs that are shifted in a first direction or a fourth direction based on the first initial RE and have the fewest number of shifted REs, and the fourth direction is the shifting direction with the largest number of available REs determined among the first direction and a second direction, the first direction is the direction of increasing frequency, the second direction is the direction of decreasing frequency, or the first direction is the direction of decreasing frequency, and the second direction is the direction of increasing frequency; Wherein, the method further includes: Determining that there are no available REs among the candidate REs and not receiving the first DMRS.

2. The method according to claim 1, characterized in that The determining, based on the first initial RE, candidate REs corresponding to the first DMRS by means of shifting includes: Based on the first initial RE, determining a first shifting range by means of shifting; Determining the REs located within the first shifting range as the candidate REs.

3. The method according to claim 2, wherein The determining, based on the first initial RE, a first shifting range by means of shifting includes: Based on the first initial RE, sequentially shifting in a first direction in the frequency domain; When a first stop shifting condition is satisfied, determining the frequency domain range obtained by shifting in the first direction as the first shifting range.

4. The method according to claim 2, wherein The determining, based on the first initial RE, a first shifting range includes: Based on the first initial RE, sequentially shifting in a first direction in the frequency domain; When a first stop shifting condition is satisfied, based on the first initial RE, sequentially shifting in a second direction in the frequency domain; When the first stop shifting condition is satisfied again, determining the frequency domain range obtained by shifting in the first direction and the second direction as the first shifting range.

5. The method according to claim 2, wherein The determining, based on the first initial RE, a first shifting range includes: Based on the first initial RE, sequentially shifting in a first direction in the frequency domain; When a first stop shifting condition is satisfied, based on the first initial RE, sequentially shifting in a second direction in the frequency domain; When the first stop shifting condition is satisfied again, based on the first initial RE, moving one time unit in a third direction in the time domain; Continuing to shift in accordance with the shifting sequence of the first direction, the second direction, and the third direction; Performing a shift in the third direction to satisfy the second stop shift condition, determining the frequency domain range obtained by performing shifts in the first direction and the second direction and the time domain range obtained by performing a shift in the third direction as the first moving range.

6. The method according to claim 5, wherein The third direction is the direction in which the time unit increases.

7. The method according to any one of claims 3 to 5, characterized in that, The first stop shift condition includes that the number of frequency domain resources for the movement is equal to a pre-determined maximum number of frequency units; The second stop shift condition includes that the number of time units for the movement is equal to a pre-determined maximum number of time units.

8. A signal receiving method, characterized in that, The method is executed by a terminal and includes: Determining a first initial resource element RE where a first demodulation reference signal DMRS of a downlink control channel PDCCH of a first system is located; Determining a second initial RE where a reference signal of a second system is located; Determining available REs; wherein, the resources corresponding to the first initial RE and the second initial RE are the same, the available REs are not occupied by other reference signals within the first frequency domain range corresponding to the PDCCH, and the other reference signals include a second DMRS or the reference signal of the second system; wherein, the reference signal of the second system is at least one of a cell-specific reference signal CRS of Long Term Evolution LTE, a physical control format indicator channel PCFICH, and a physical hybrid automatic repeat request indicator channel PHICH; Detecting and receiving the first DMRS on the available REs; Wherein, the determining of the available REs includes: Determining a first ratio of the second initial REs occupied within the first frequency domain range; Determining an available RE index set based on the first ratio; wherein, there is a preset corresponding relationship between the first ratio and the available RE index set; Removing the second initial REs from the first frequency domain range to obtain a candidate RE set; Determining the available REs from the candidate RE set based on the available RE index set; Wherein, the determining of the available REs from the candidate RE set based on the available RE index set includes: Renumbering each RE in the candidate RE set in ascending order of the corresponding index, and determining the index value of each RE in the candidate RE set; In the candidate RE set, determining the REs indicated by the available RE index set as the available REs.

9. The method according to claim 8, wherein The determining of the first ratio of the second initial REs occupied within the first frequency domain range includes: Determining the ratio of the number of the second initial REs within the first frequency domain range to the total number of REs included in the first frequency domain range to obtain the first ratio.

10. A method for transmitting a signal, characterized in that, The method is executed by a base station and includes: Determining a first initial resource element RE where a first demodulation reference signal DMRS of a downlink control channel PDCCH of a first system is located; Determining a second initial RE where a reference signal of a second system is located; Based on the first initial RE, determining candidate REs corresponding to the first DMRS by a shift method; wherein, the resources corresponding to the first initial RE and the second initial RE are the same; Transmit the first DMRS on the available REs among the candidate REs, where the available REs are not occupied by other reference signals, and the other reference signals are the second DMRS or the reference signals of the second system; where the reference signals of the second system are at least one of the cell - level reference signal CRS of Long - Term Evolution (LTE), the Physical Control Format Indication Channel (PCFICH), and the Physical Hybrid ARQ Indication Channel (PHICH); where the available REs are the REs that are shifted from the first initial RE in the first direction or the fourth direction with the least number of shifted REs, and the fourth direction is the shifting direction with the largest number of available REs determined among the first direction and the second direction, the first direction is the direction of increasing frequency, the second direction is the direction of decreasing frequency, or the first direction is the direction of decreasing frequency and the second direction is the direction of increasing frequency; Wherein, the method further includes: Determine that there is no available RE among the candidate REs, and do not transmit the first DMRS.

11. The method according to claim 10, wherein The method of determining the candidate REs corresponding to the first DMRS by shifting based on the first initial RE includes: Determine a first moving range by shifting based on the first initial RE; Determine the REs within the first moving range as the candidate REs.

12. The method according to claim 11, wherein The method of determining a first moving range by shifting based on the first initial RE includes: Perform sequential shifting in the first direction in the frequency domain based on the first initial RE; When the first stop - shifting condition is met, determine the frequency - domain range obtained by shifting in the first direction as the first moving range.

13. The method according to claim 11, wherein The method of determining a first moving range by shifting based on the first initial RE includes: Perform sequential shifting in the first direction in the frequency domain based on the first initial RE; When the first stop - shifting condition is met, perform sequential shifting in the second direction in the frequency domain based on the first initial RE; When the first stop - shifting condition is met again, determine the frequency - domain range obtained by shifting in the first direction and the second direction as the first moving range.

14. The method according to claim 11, wherein The method of determining a first moving range by shifting based on the first initial RE includes: Perform sequential shifting in the first direction in the frequency domain based on the first initial RE; When the first stop - shifting condition is met, perform sequential shifting in the second direction in the frequency domain based on the first initial RE; When the first stop - shifting condition is met again, move one time unit in the third direction in the time domain based on the first initial RE; Continue to shift according to the shifting sequence of the first direction, the second direction, and the third direction; When the shifting in the third direction meets the second stop - shifting condition, determine the frequency - domain range obtained by shifting in the first direction and the second direction and the time - domain range obtained by shifting in the third direction as the first moving range.

15. The method according to claim 14, wherein The third direction is the direction of increasing time units.

16. The method according to any one of claims 12-14, characterized in that The first stop - shifting condition includes that the number of frequency - domain resources shifted is equal to the pre - determined maximum number of frequency units; The second stop shifting condition includes that the number of time units of movement is equal to a predetermined maximum number of time units.

17. A method for transmitting a signal, characterized in that, The method is executed by a base station and includes: Determining a first initial resource element (RE) where a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system is located; Determining a second initial RE where a reference signal of a second system is located; Determining available REs; wherein, the resource corresponding to the first initial RE is the same as that corresponding to the second initial RE, and the available REs are not occupied by other reference signals within a first frequency domain range corresponding to the PDCCH, and the other reference signals include a second DMRS or the reference signal of the second system; wherein, the reference signal of the second system is at least one of a cell - specific reference signal (CRS) of Long Term Evolution (LTE), a physical control format indicator channel (PCFICH), and a physical hybrid automatic repeat request indicator channel (PHICH); Transmitting the first DMRS on the available REs; Wherein, the determining of the available REs includes: Determining a first ratio of the second initial REs occupied within the first frequency domain range; Determining a set of available RE indexes based on the first ratio; wherein, there is a preset corresponding relationship between the first ratio and the set of available RE indexes; Obtaining a set of candidate REs by removing the second initial REs from the first frequency domain range; Determining the available REs from the set of candidate REs based on the set of available RE indexes; Wherein, the determining of the available REs from the set of candidate REs based on the set of available RE indexes includes: Renumbering each RE in the set of candidate REs in ascending order according to the corresponding index, and determining the index value of each RE in the set of candidate REs; In the set of candidate REs, determining the REs indicated by the set of available RE indexes as the available REs.

18. The method according to claim 17, wherein The determining of the first ratio of the second initial REs occupied within the first frequency domain range includes: Determining a ratio of the number of the second initial REs within the first frequency domain range to the total number of REs included in the first frequency domain range, to obtain the first ratio.

19. A device for receiving a signal, characterized in that, Includes: A processing module configured to determine a first initial resource element (RE) corresponding to a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system; The processing module is further configured to determine a second initial RE corresponding to a reference signal of a second system; The processing module is further configured to determine candidate REs corresponding to the first DMRS based on the first initial RE by a shifting method; wherein, the resource corresponding to the first initial RE is the same as that corresponding to the second initial RE; A receiving module, configured to detect and receive the first DMRS on available resource elements (REs) among the candidate REs; wherein, the available REs are not occupied by other reference signals, and the other reference signals are the second DMRS or the reference signals of the second system; wherein, the reference signals of the second system are at least one of the cell - level reference signal (CRS) of Long - Term Evolution (LTE), the physical control format indicator channel (PCFICH), and the physical hybrid automatic repeat request indicator channel (PHICH); wherein, the available REs are the REs that are shifted from the first initial RE in the first direction or the fourth direction with the least number of shifted REs, and the fourth direction is the shifting direction with the largest number of available REs determined among the first direction and the second direction, the first direction is the direction of increasing frequency, the second direction is the direction of decreasing frequency, or the first direction is the direction of decreasing frequency, and the second direction is the direction of increasing frequency; The processing module is further configured to determine that there are no available REs among the candidate REs and not receive the first DMRS.

20. A device for receiving a signal, characterized in that, Comprising: A processing module, configured to determine a first initial resource element (RE) where a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system is located; The processing module is further configured to determine a second initial RE where a reference signal of a second system is located; The processing module is further configured to determine available REs; wherein, the resources corresponding to the first initial RE and the second initial RE are the same, and the available REs are not occupied by other reference signals within a first frequency domain range corresponding to the PDCCH, and the other reference signals include the second DMRS or the reference signals of the second system; wherein, the reference signals of the second system are at least one of the cell - level reference signal (CRS) of Long - Term Evolution (LTE), the physical control format indicator channel (PCFICH), and the physical hybrid automatic repeat request indicator channel (PHICH); A receiving module, configured to detect and receive the first DMRS on the available REs; Wherein, the processing module is further configured to: Determine a first ratio occupied by the second initial RE within the first frequency domain range; Determine an available RE index set based on the first ratio; wherein, there is a preset correspondence between the first ratio and the available RE index set; Obtain a candidate RE set by removing the second initial RE from the first frequency domain range; Determine the available REs in the candidate RE set based on the available RE index set; Wherein, the processing module is further configured to: Renumber each RE in the candidate RE set in ascending order of the corresponding index, and determine the index value of each RE in the candidate RE set; In the candidate RE set, determine the REs indicated by the available RE index set as the available REs.

21. A device for transmitting signals, characterized in that, Comprising: A processing module, configured to determine a first initial resource element (RE) where a first demodulation reference signal (DMRS) of a physical downlink control channel (PDCCH) of a first system is located; The processing module is further configured to determine a second initial resource element (RE) where the reference signal of the second system is located. The processing module is further configured to determine candidate REs corresponding to the first DMRS based on the first initial RE by means of shifting; wherein, the resource corresponding to the first initial RE is the same as that corresponding to the second initial RE. The sending module is configured to send the first DMRS on available REs among the candidate REs; wherein, the available REs are not occupied by other reference signals, and the other reference signals are the second DMRS or the reference signals of the second system; wherein, the reference signals of the second system are at least one of a cell - specific reference signal (CRS) of Long - Term Evolution (LTE), a physical control format indicator channel (PCFICH), and a physical hybrid automatic repeat request indicator channel (PHICH); wherein, the available REs are the REs that are shifted in the first direction or the fourth direction based on the first initial RE and have the fewest number of shifted REs, and the fourth direction is the direction in which the number of available REs determined in the first direction and the second direction is the largest, the first direction is the direction of increasing frequency, the second direction is the direction of decreasing frequency, or the first direction is the direction of decreasing frequency, and the second direction is the direction of increasing frequency. The processing module is further configured to determine that there are no available REs among the candidate REs and not send the first DMRS.

22. A device for transmitting signals, characterized in that, Comprising: A processing module configured to determine a first initial resource element (RE) where the first demodulation reference signal (DMRS) of the downlink control channel (PDCCH) of the first system is located. The processing module is further configured to determine a second initial RE where the reference signal of the second system is located. The processing module is further configured to determine available REs; wherein, the resource corresponding to the first initial RE is the same as that corresponding to the second initial RE, and the available REs are not occupied by other reference signals within the first frequency domain range corresponding to the PDCCH, and the other reference signals include the second DMRS or the reference signals of the second system; wherein, the reference signals of the second system are at least one of a cell - specific reference signal (CRS) of Long - Term Evolution (LTE), a physical control format indicator channel (PCFICH), and a physical hybrid automatic repeat request indicator channel (PHICH). The sending module is configured to send the first DMRS on the available REs. Wherein, the processing module is further configured to: Determine a first ratio occupied by the second initial RE within the first frequency domain range. Determine an available RE index set based on the first ratio; wherein, there is a preset corresponding relationship between the first ratio and the available RE index set. Obtain a candidate RE set by removing the second initial RE from the first frequency domain range. Determine the available REs in the candidate RE set based on the available RE index set. Wherein, the processing module is further configured to: Renumber each RE in the candidate RE set in ascending order according to the corresponding index, and determine the index value of each RE in the candidate RE set. In the candidate RE set, determine the REs indicated by the available RE index set as the available REs.

23. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, which is used to execute the method for receiving signals according to any one of claims 1-9 above.

24. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, which is used to execute the method for transmitting signals according to any one of claims 10-18 above.

25. A communication device, characterized in that, Comprising: A processor; A memory for storing processor-executable instructions; Wherein, the processor is configured to execute the executable instructions to implement the steps of the method for receiving signals according to any one of claims 1-9 above.

26. A signal transmission device, characterized in that, Comprising: A processor; A memory for storing processor-executable instructions; Wherein, the processor is configured to execute the executable instructions to implement the steps of the method for transmitting signals according to any one of claims 10-18 above.

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