Optimization method for improving system capacity, base station, and communication system

Abstract

The present disclosure provides an optimization method, a base station and a communication system for improving system capacity. The optimization method for improving system capacity comprises: obtaining downlink resource configuration information of a second base station; determining a pairing relationship between a first cell of a first base station and a second cell of the second base station according to pre-configuration information of the first base station and the downlink resource configuration information; sending the pairing relationship to the second base station, so that the second base station sends pilot signal configuration information of the second cell to the first base station in the case that there is a transmission correlation relationship between the first cell and the second cell; mapping a demodulation reference signal of the first cell to a corresponding time-frequency resource block according to the pilot signal configuration information of the second cell; and sending interference indication information to a user terminal in the first cell through RRC signaling when the corresponding time-frequency resource block is a time-frequency resource block occupied by the pilot signal of the second cell, so that the user terminal performs data demodulation according to the interference indication information.

Description

Technical Field

[0001] This disclosure relates to the field of wireless communication, and in particular to an optimization method, base station, and communication system for improving system capacity. Background Technology

[0002] As the main technology for next-generation wireless networks, 5G features support for ultra-wideband and massive connectivity. Currently, wireless networks are primarily based on LTE (Long Term Evolution). Therefore, NR (New Radio) fully considers the coexistence requirements with LTE systems during system design. This includes both inter-frequency and intra-frequency coexistence with LTE. Adjacent-frequency coexistence refers to LTE and NR systems being deployed on adjacent spectrums. For example, if LTE network traffic is insufficient, a portion of the spectrum can be allocated for deploying NR systems. Co-frequency coexistence refers to the situation where the spectrum of LTE and NR systems overlaps. In this case, the NR system utilizes some resources within LTE subframes to transmit and receive data. For example, for downlink transmission, NR transmission can be scheduled within LTE's MBSFN (Multicast Broadcast Single Frequency Network) and non-MBSFN subframes, using slot-based or micro-slot-based scheduling. This requires avoiding the use of LTE's PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal), PBCH (Physical Broadcast Channel), and CRS (Cell Reference Signal). When LTE and NR systems are deployed on the same frequency and NR transmission is scheduled within LTE's non-MBSFN subframes, NR transmission should avoid using the resources occupied by the LTE PDCCH (Physical Downlink Control Channel) (which occupies the first 1-3 OFDM (Orthogonal Frequency Division Multiplexing) symbols) and CRS.

[0003] According to existing protocols, other reference signals in NR, such as the DM-RS (Demodulation Reference Signal), also need to avoid co-channel interference with LTE signals. Specifically, NR downlink traffic channels rely on the DM-RS for channel estimation to achieve coherent demodulation. The DM-RS and data use the same precoding process, so the channel estimated by the receiver from the DM-RS can be directly used for data demodulation. According to existing protocols, when the DM-RS conflicts with resource elements of the CRS indicated by higher-layer parameters, the position of the DM-RS in the PDSCH (Physical Downlink Shared Channel) needs to be shifted by one symbol.

[0004] To improve the spectral efficiency of 5G systems, NOMA (Non-Orthogonal Multiple Access) technology has been proposed. In OMA (Orthogonal Multiple Access), if allocation is based on frequency or time, a resource block can only be allocated to one user. However, NOMA technology can allocate the same time-frequency resource block to multiple users, distinguishing them through power multiplexing. At the receiver, interference cancellation algorithms achieve correct demodulation. Compared to orthogonal transmission, non-orthogonal transmission increases receiver complexity but improves spectral efficiency.

[0005] According to existing protocols, when two NR base stations exchange configuration or update configuration information, they also exchange configuration information of adjacent LTE cells. Summary of the Invention

[0006] The inventors noted that in scenarios where the first and second systems coexist on the same frequency, to effectively suppress interference, the demodulation reference signal of the second system and the pilot signal of the first system need to be mapped to different time-frequency resources. However, to further improve spectral efficiency and system capacity, the following issues remain in current standards and implementations:

[0007] - Inability to achieve higher spectral efficiency and system capacity: Currently, physical isolation is required to eliminate co-channel interference, meaning that signals of different standards cannot be multiplexed onto the same time-frequency resources, thereby suppressing the utilization rate of spectral resources and reducing system capacity.

[0008] - Unable to obtain interference indication information: The current standard RRC (Radio Resource Control) signaling lacks interference indication information for specific time and frequency resources. The terminal cannot obtain interference indication information on relevant resources from the RRC signaling, so it cannot achieve better interference cancellation or more flexible coherent detection from the receiving side, thereby reducing system performance.

[0009] - Unable to obtain the maximum utility of the demodulation reference signal: According to the current standard, the terminal cannot obtain channel state information by demodulating part of the demodulation reference signal based on relevant interference indication information, which suppresses spectral efficiency and the maximum utility of part of the demodulation reference signal, reduces system performance, and at the same time restricts the multiplexing mechanism of the demodulation reference signal and other system signals.

[0010] Therefore, this disclosure provides an optimization scheme for improving system capacity to meet the needs of network deployment and optimization.

[0011] According to a first aspect of the present disclosure, an optimization method for improving system capacity is provided. The optimization method is executed by a first base station and includes: acquiring downlink resource configuration information of a second base station; determining a pairing relationship between a first cell of the first base station and a second cell of the second base station based on pre-configuration information of the first base station and the downlink resource configuration information; sending the pairing relationship to the second base station so that the second base station sends pilot signal configuration information of the second cell to the first base station when there is a transmission association relationship between the first cell and the second cell; mapping a demodulation reference signal of the first cell to a corresponding time-frequency resource block based on the pilot signal configuration information of the second cell; and, when the corresponding time-frequency resource block is a time-frequency resource block occupied by the pilot signal of the second cell, sending interference indication information related to the time-frequency resource block to a user terminal in the first cell via RRC signaling so that the user terminal demodulates the demodulation reference signal of the first cell based on the interference indication information and demodulates the service channel data of the first cell using the demodulation reference signal of the first cell.

[0012] In some embodiments, obtaining downlink resource configuration information of the second base station includes: obtaining downlink resource configuration information of the second base station through the interface between the first base station and the second base station, wherein the air interface standard of the first base station is different from that of the second base station.

[0013] In some embodiments, the downlink resource configuration information includes at least one of the cell identifier of the second cell, the downlink frequency information of the second cell, the resource configuration information of the pilot signal, and the transmit power information; the resource configuration information of the pilot signal includes time domain occupancy and frequency domain occupancy.

[0014] In some embodiments, when the first base station and the second base station perform simultaneous data transmission and reception operations on the same frequency, the pairing relationship includes the transmission association relationship between the first cell and the second cell.

[0015] In some embodiments, the pilot signal configuration information of the second cell includes at least one of the cell identifier, downlink carrier frequency, downlink carrier bandwidth, number of antenna ports, pilot signal resource configuration information, and transmit power information of the second cell; the pilot signal resource configuration information includes time domain occupancy and frequency domain occupancy.

[0016] In some embodiments, mapping the demodulation reference signal of the first cell to the corresponding time-frequency resource block includes mapping the demodulation reference signal of the service channel of the first cell to the corresponding time-frequency resource block.

[0017] In some embodiments, sending interference indication information to a user terminal in the first cell via RRC signaling includes: sending configuration information of the service channel and configuration information of the demodulation reference signal to the user terminal via RRC signaling; wherein, the configuration information of the demodulation reference signal includes configuration parameters of the demodulation reference signal, interference indication information, and transmit power information, the configuration parameters of the demodulation reference signal include demodulation reference signal type parameters, demodulation reference signal location parameters, and demodulation reference signal length parameters, and the interference indication information is used to indicate whether the demodulation reference signal on the time-frequency resource block has co-channel interference with the pilot signal of the second cell.

[0018] In some embodiments, the configuration information of the service channel includes mapping type information and data service resource configuration information of the service channel; the data service resource configuration information of the service channel includes time domain occupancy and frequency domain occupancy.

[0019] According to a second aspect of the present disclosure, a base station is provided, comprising: a memory configured to store instructions; and a processor coupled to the memory, the processor being configured to execute instructions stored in the memory to implement the method as described in any of the above embodiments.

[0020] According to a third aspect of the present disclosure, a communication system is provided, comprising: a first base station, which is a base station as described in any of the above embodiments; a second base station configured to send pilot signal configuration information of the second cell to the first base station based on a pairing relationship obtained from the first base station, in the case where there is a transmission association relationship between a first cell of the first base station and a second cell of the second base station; and a user terminal in the first cell configured to demodulate a demodulation reference signal of the first cell based on interference indication information sent by the first base station, and to demodulate service channel data of the first cell using the demodulation reference signal of the first cell.

[0021] In some embodiments, the pilot signal configuration information includes at least one of the following: cell identifier of the second cell, downlink carrier frequency, downlink carrier bandwidth, number of antenna ports, pilot signal resource configuration information, and transmit power; the pilot signal resource configuration information includes time domain occupancy and frequency domain occupancy.

[0022] In some embodiments, the user terminal is configured to, after receiving configuration information of the service channel and configuration information of the demodulation reference signal sent by the first base station, demodulate the information received by the time-frequency resource block with co-channel interference when the interference indication information included in the configuration information of the demodulation reference signal indicates that the demodulation reference signal has co-channel interference with the pilot signal of the second cell, to obtain the demodulated demodulation reference signal, obtain channel state information using the demodulated demodulation reference signal, and demodulate the service channel data of the first cell using the demodulated demodulation reference signal and the channel state information.

[0023] In some embodiments, the user terminal is configured to demodulate information received from time-frequency resource blocks that are subject to co-frequency interference using the Serial Interference Cancellation (SIC) algorithm.

[0024] In some embodiments, the user terminal is configured to, after receiving configuration information of the service channel and configuration information of the demodulation reference signal sent by the first base station, demodulate the information received by the time-frequency resource block that does not have co-channel interference, in the case that the interference indication information included in the configuration information of the demodulation reference signal indicates that the demodulation reference signal has co-channel interference with the pilot signal of the second cell, to obtain the demodulated demodulation reference signal, use the demodulated demodulation reference signal to obtain channel state information, and use the demodulated demodulation reference signal and the channel state information to demodulate the service channel data of the first cell.

[0025] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions that, when executed by a processor, implement the method as described in any of the above embodiments.

[0026] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a flowchart illustrating an optimization method for improving system capacity according to an embodiment of the present disclosure;

[0029] Figure 2 This is a schematic diagram of a demodulation reference signal mapping according to an embodiment of the present disclosure;

[0030] Figure 3 This is a schematic diagram of a demodulation reference signal mapping according to another embodiment of the present disclosure;

[0031] Figure 4 This is a schematic diagram of the structure of a base station according to an embodiment of the present disclosure;

[0032] Figure 5 This is a schematic diagram of the structure of a communication system according to an embodiment of the present disclosure;

[0033] Figure 6 This is a flowchart illustrating an optimization method for improving system capacity according to another embodiment of this disclosure. Detailed Implementation

[0034] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0035] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure.

[0036] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0037] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0038] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0040] Figure 1 This is a flowchart illustrating an optimization method for improving system capacity according to an embodiment of this disclosure. In some embodiments, the following optimization method for improving system capacity is performed by a first base station.

[0041] Step 101: Obtain the downlink resource configuration information of the second base station.

[0042] In some embodiments, downlink resource configuration information of the second base station is obtained through an interface between the first base station and the second base station, wherein the air interface standard of the first base station is different from that of the second base station. For example, the first base station is an NR base station, and the second base station is an LTE base station.

[0043] In some embodiments, the downlink resource configuration information includes at least one of the following:

[0044] - The cell identifier of the second cell, such as the cell PCI (Physical Cell Identifier) ​​obtained through PSS and SSS.

[0045] -Downlink frequency information for the second cell

[0046] - Pilot signal resource configuration information

[0047] √Time Domain Occupancy: Indicates the number of time domain symbols occupied by the pilot signal.

[0048] √ Frequency Domain Occupancy: Indicates the number of frequency domain symbols occupied by the pilot signal.

[0049] - Transmit power information: Indicates the power allocated to this pilot signal, such as the power calculation method for RS (Reference Signal) in TS 36.213.

[0050] In step 102, the pairing relationship between the first cell of the first base station and the second cell of the second base station is determined based on the pre-configuration information and downlink resource configuration information of the first base station.

[0051] In step 103, the pairing relationship is sent to the second base station so that the second base station can send the pilot signal configuration information of the second cell to the first base station if there is a transmission association relationship between the first cell and the second cell.

[0052] In some embodiments, when the first base station and the second base station perform simultaneous data transmission and reception operations on the same frequency, the pairing relationship includes the transmission association relationship between the first cell and the second cell.

[0053] In some embodiments, the pilot signal configuration information of the second cell includes at least one of the following:

[0054] - The cell identifier of the second cell: for example, the cell PCI obtained through PSS and SSS.

[0055] - Downlink carrier frequency: The carrier frequency occupied by the pilot signal of the second cell is similar to the carrierFreqDL defined in RateMatchPatternLTE-CRS in TS38.331.

[0056] - Downlink carrier bandwidth: The bandwidth occupied by the pilot signal in the second cell, measured in PRBs (Physical Resource Blocks).

[0057] - Number of antenna ports: Antenna ports occupied by the pilot signal of the second cell

[0058] - Pilot signal resource configuration information

[0059] √Time Domain Occupancy: Indicates the number of time domain symbols occupied by the pilot signal.

[0060] √ Frequency Domain Occupancy: Indicates the number of frequency domain symbols occupied by the pilot signal.

[0061] - Transmit power information: Indicates the power allocated to this pilot signal, such as the power allocation scheme for RS in TS 36.213.

[0062] In step 104, the demodulation reference signal of the first cell is mapped onto the corresponding time-frequency resource block according to the pilot signal configuration information of the second cell.

[0063] In some embodiments, the demodulation reference signal of the service channel of the first cell is mapped onto the corresponding time-frequency resource block.

[0064] For example, such as Figure 2 As shown, the time-frequency resource block occupied by the demodulation reference signal of the service channel of the first cell is not the time-frequency resource block occupied by the pilot signal of the second cell.

[0065] For example, such as Figure 3 As shown, the time-frequency resource block occupied by the demodulation reference signal of the service channel of the first cell is the same as the time-frequency resource block occupied by the pilot signal of the second cell.

[0066] In step 105, if the corresponding time-frequency resource block is the time-frequency resource block occupied by the pilot signal of the second cell, the interference indication information related to the time-frequency resource block is sent to the user terminal in the first cell through RRC signaling, so that the user terminal can demodulate the demodulation reference signal of the first cell according to the interference indication information, and use the demodulation reference signal of the first cell to demodulate the service channel data of the first cell.

[0067] In some embodiments, configuration information of the service channel and configuration information of the demodulation reference signal are sent to the user terminal via RRC signaling.

[0068] In some embodiments, the configuration information of the demodulation reference signal includes at least one of the following:

[0069] - Configuration parameters for the demodulation reference signal: similar to the parameters defined in DMRS-DownlinkConfig in TS38.331.

[0070] √ Demodulation reference signal type parameter: similar to parameter dmrs-Type

[0071] √ Demodulation reference signal position parameter: similar to parameter dmrs-AdditionalPosition

[0072] √ Demodulation reference signal length parameter: similar to the parameter maxLength

[0073] - Interference Indication Information: This indicates whether the demodulation reference signal on the time-frequency resource block is subject to co-channel interference with the pilot signal of the second cell. A value of 1 indicates that the demodulation reference signal on this time-frequency resource will be interfered with by the pilot signal of the second cell, while a value of 0 indicates that the demodulation reference signal on this time-frequency resource is not interfered with by neighboring cells.

[0074] - Transmit power information: Indicates the power allocated to the demodulation reference signal, which is different from the transmit power of the second cell pilot signal.

[0075] In some embodiments, the configuration information for the service channel includes at least one of the following:

[0076] -Mapping type information

[0077] - Data service resource configuration information for the service channel, including:

[0078] √Time domain occupancy: For example, indicating the number of time domain symbols occupied by PDSCH data services.

[0079] √ Frequency domain occupancy status: For example, indicating the number of frequency domain symbols occupied by PDSCH data services.

[0080] In the optimization method for improving system capacity provided in the above embodiments of this disclosure, when the time-frequency resource block occupied by the demodulation reference signal of the service channel of the first cell is the time-frequency resource block occupied by the pilot signal of the second cell, interference indication information related to the time-frequency resource block is sent to the user terminal in the first cell through RRC signaling, so that the user terminal can perform demodulation processing according to the interference indication information, thereby improving the spectrum efficiency while ensuring the demodulation accuracy and improving the system capacity.

[0081] Figure 4 This is a schematic diagram of the structure of a base station according to an embodiment of this disclosure. Figure 4 As shown, the base station includes a memory 41 and a processor 42.

[0082] Memory 41 is used to store instructions, and processor 42 is coupled to memory 41. Processor 42 is configured to execute instructions based on the memory storage, as shown in the example. Figure 1 The method involved in any of the embodiments.

[0083] like Figure 4 As shown, the base station also includes a communication interface 43 for exchanging information with other devices. Additionally, the base station includes a bus 44, through which the processor 42, communication interface 43, and memory 41 communicate with each other.

[0084] The memory 41 may include high-speed RAM, and may also include non-volatile memory, such as at least one disk storage device. The memory 41 may also be a memory array. The memory 41 may also be divided into blocks, and the blocks may be combined into virtual volumes according to certain rules.

[0085] Furthermore, processor 42 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present disclosure.

[0086] This disclosure also relates to a computer-readable storage medium storing computer instructions that, when executed by a processor, implement... Figure 1 The method involved in any of the embodiments.

[0087] Figure 5 This is a schematic diagram of the structure of a communication system according to an embodiment of this disclosure. Figure 5 As shown, the communication system includes a first base station 51, a second base station 52, and a user terminal 53 within a first cell of the first base station 51. The first base station 51 is... Figure 4 The base station involved in any of the embodiments. In some embodiments, the first base station 51 is an NR base station and the second base station 52 is an LTE base station.

[0088] The second base station 52 is configured to send pilot signal configuration information of the second cell to the first base station 51 based on the pairing relationship obtained from the first base station 51, in the case where there is a transmission association relationship between the first cell of the first base station and the second cell of the second base station.

[0089] In some embodiments, pilot signal configuration information includes at least one of the following:

[0090] - The cell identifier of the second cell: for example, the cell PCI obtained through PSS and SSS.

[0091] - Downlink carrier frequency: The carrier frequency occupied by the pilot signal of the second cell is similar to the carrierFreqDL defined in RateMatchPatternLTE-CRS in TS38.331.

[0092] - Downlink carrier bandwidth: The bandwidth occupied by the pilot signal in the second cell, measured in PRBs.

[0093] - Number of antenna ports: Antenna ports occupied by the pilot signal of the second cell

[0094] - Pilot signal resource configuration information

[0095] √Time Domain Occupancy: Indicates the number of time domain symbols occupied by the pilot signal.

[0096] √ Frequency Domain Occupancy: Indicates the number of frequency domain symbols occupied by the pilot signal.

[0097] - Transmit power: Indicates the power allocated to the pilot signal, such as the power allocation scheme for RS in TS 36.213.

[0098] User terminal 53 is configured to demodulate the demodulation reference signal of the first cell according to the interference indication information sent by the first base station 51, and to demodulate the service channel data of the first cell using the demodulation reference signal of the first cell.

[0099] In some embodiments, after receiving the configuration information of the service channel and the configuration information of the demodulation reference signal sent by the first base station 51, the user terminal 53 demodulates the information received by the time-frequency resource block with co-channel interference if the interference indication information included in the configuration information of the demodulation reference signal indicates that there is co-channel interference between the demodulation reference signal and the pilot signal of the second cell, so as to obtain the demodulated demodulation reference signal, obtain the channel state information using the demodulated demodulation reference signal, and demodulate the service channel data of the first cell using the demodulated demodulation reference signal and the channel state information.

[0100] In some embodiments, the user terminal 53 uses the SIC (Successive Interference Cancellation) algorithm to demodulate the information received by the time-frequency resource block that has co-frequency interference.

[0101] It should be noted that since the SIC algorithm itself is not the inventive point of this disclosure, it will not be described in detail here.

[0102] In other embodiments, after receiving the configuration information of the service channel and the configuration information of the demodulation reference signal sent by the first base station 51, the user terminal 53 demodulates the information received by the time-frequency resource block that does not have co-channel interference, in the case that the interference indication information included in the configuration information of the demodulation reference signal indicates that there is co-channel interference between the demodulation reference signal and the pilot signal of the second cell, so as to obtain the demodulated demodulation reference signal, use the demodulated demodulation reference signal to obtain the channel state information, and use the demodulated demodulation reference signal and the channel state information to demodulate the service channel data of the first cell.

[0103] The following specific examples illustrate this disclosure.

[0104] Figure 6 This is a flowchart illustrating an optimization method for improving system capacity according to another embodiment of this disclosure.

[0105] The gNB and eNB base stations are frequency-sharing base stations. The two base stations are connected by optical fiber, and each base station contains two cells: the cell in the gNB base station is called Cell 1, and the cell in the eNB base station is called Cell 2. The main frequency band for frequency sharing is the 2.1GHz FDD (Frequency Division Duplex) band.

[0106] In step 601, the gNB obtains the CRS resource configuration information of cell 2 in the eNB through the interface with the eNB. The gNB and eNB use different air interface standards. The CRS configuration information of cell 2 includes the following information:

[0107] - Cell 2 Identifier: PCI Information

[0108] - Cell 2 downlink frequency information: 2.1GHz

[0109] - Dual antenna port numbers: 0 and 1

[0110] -CRS resource configuration:

[0111] √ Time domain occupancy: OFDM symbols 1, 5, 8, and 12

[0112] √ Frequency domain occupancy: The pilot signals of each port differ by 5 subcarriers within one OFDM symbol, and the pilot signals of two single ports differ by 2 subcarriers within one OFDM symbol.

[0113] - Transmit power information: For example, the power configured for CRS is 18.2 dBm.

[0114] In step 602, the gNB determines the pairing relationship based on the pre-configuration information and the CRS configuration information of cell 2, wherein cells within the gNB and cells within the eNB have a transmission association relationship.

[0115] In step 603, the eNB obtains the pairing relationship between cell 1 and the cell through the direct interface with the gNB.

[0116] In step 604, the eNB sends the CRS configuration information of cell 2 to the gNB according to the transmission association relationship. This configuration information includes:

[0117] - Cell 2 Identifier: PCI Information

[0118] - Cell 2 downlink frequency information: 2.1GHz

[0119] - Dual antenna port numbers: 0 and 1

[0120] -CRS resource configuration:

[0121] √ Time domain occupancy: OFDM symbols 1, 5, 8, and 12

[0122] √ Frequency domain occupancy: The pilot signals of each port differ by 5 subcarriers within one OFDM symbol, and the pilot signals of two single ports differ by 2 subcarriers within one OFDM symbol.

[0123] - Transmit power information: Assuming the CRS is configured with a power of 15.2 dBm.

[0124] In step 605, the gNB maps the PDSCH data and DM-RS signal of cell 1 to the corresponding time and frequency resources based on the transmission association with the eNB and the configuration information of cell 2 CRS.

[0125] The configuration information for PDSCH data includes:

[0126] - Mapping type: The mapping type of PDSCH is mapping type A.

[0127] - PDSCH data service periodic configuration: similar to

[0128] √Time domain occupancy status: such as the time domain resources occupied by PDSCH data services as indicated by the Timedomain resource assignment field in DCI (Downlink Control Information).

[0129] √ Frequency domain occupancy: The frequency domain resources occupied by PDSCH data services, as indicated by the Frequency domain resource assignment field in DCI.

[0130] The configuration information for the demodulation reference signal includes:

[0131] - Configuration parameters for the demodulation reference signal: similar to the parameters defined in DMRS-DownlinkConfig in TS38.331.

[0132] √Demodulation reference signal type: Configuration type 1

[0133] √ Demodulation reference signal position: For example, DM-RS occupies the 4th and 11th OFDM symbols.

[0134] √ Demodulation reference signal length: For example, this DM-RS occupies two OFDM symbols.

[0135] - Interference indicator: A value of 1 indicates that the DM-RS on this time-frequency resource will be interfered with by the CRS of the second cell; a value of 0 indicates that the DM-RS on this time-frequency resource is not interfered with by neighboring cells.

[0136] - Transmit power information: For example, the power configured for DM-RS is 18.2 dBm.

[0137] In step 606, the gNB sends the configuration information of the PDSCH and its DM-RS to the terminal via an RRC message. The DM-RS configuration includes, but is not limited to, the following information:

[0138] - Configuration parameters for the demodulation reference signal: similar to the parameters defined in DMRS-DownlinkConfig in TS38.331.

[0139] √Demodulation reference signal type: Configuration type 1

[0140] √ Demodulation reference signal position: For example, DM-RS occupies the 4th and 12th OFDM symbols.

[0141] √Demodulation reference signal length: This DM-RS occupies two OFDM symbols.

[0142] - Interference indicator: A value of 1 indicates that the DM-RS on this time-frequency resource will be interfered with by the CRS of the second cell, while a value of 0 indicates that the DM-RS on this time-frequency resource is not interfered with by neighboring cells. Specifically, on the relevant time-frequency resource (Resource Element, RE) on the 12th OFDM symbol, a value of 1 indicates relevant interference.

[0143] - Transmit power information: Assuming the power configured for DM-RS is 18.2 dBm

[0144] In step 607, after receiving the configuration information of the PDSCH and its DM-RS, the terminal in cell 1 learns that there is co-channel interference on the relevant RE on the 12th OFDM symbol. For these interfering REs, the received signal is demodulated by an advanced receiver, for example, using the SIC algorithm, to detect the required DM-RS.

[0145] Alternatively, unlike the interference cancellation algorithms of the aforementioned advanced receivers, after obtaining interference indication information related to DM-RS, the terminal can choose to skip demodulating the DM-RS on a RE with co-channel interference and obtain relevant precoding and channel information by demodulating the DM-RS on other REs.

[0146] Next, the terminal obtains precoding and channel state information by demodulating the DM-RS on the relevant RE, and then demodulates the data in the PDSCH based on the demodulated information.

[0147] By implementing the above-described scheme of this disclosure, at least one of the following beneficial effects can be obtained:

[0148] The present invention has the following advantages:

[0149] 1) This disclosure solves the problem of co-frequency interference between signals of different standards in co-frequency coexistence scenarios. By implementing more advanced interference cancellation or more flexible coherent detection at the receiving end, reference signals of different standards can be multiplexed onto the same time and frequency resources, thereby improving spectrum efficiency and system capacity.

[0150] 2) This disclosure sends time-frequency resource information with interference to the terminal through RRC signaling. After receiving the relevant message, the connected terminal eliminates the interference through an advanced interference cancellation algorithm or demodulates it through a flexible coherent detection mechanism, thereby improving system performance.

[0151] 3) In this disclosure, the receiving end obtains channel state information by demodulating a portion of the demodulation reference signal according to relevant indication information, which fully exploits the performance of the portion of the demodulation reference signal, improves spectral efficiency and system performance, and at the same time makes the multiplexing mechanism of the demodulation reference signal and other signals more flexible.

[0152] 4) This disclosure has minimal impact on terminals and offers good backward compatibility and deployment feasibility. This disclosure enhances existing protocols without introducing new protocol processes, resulting in minimal modifications to existing protocols and lower implementation difficulty.

[0153] In some embodiments, the functional unit modules described above may be implemented as general-purpose processors, programmable logic controllers (PLCs), digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described herein.

[0154] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0155] The description in this disclosure is provided for illustrative and descriptive purposes only and is not intended to be exhaustive or to limit the disclosure to its forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of this disclosure and to enable those skilled in the art to understand this disclosure and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An optimization method for improving system capacity, the optimization method being performed by a first base station, comprising: Obtain downlink resource configuration information from the second base station; The pairing relationship between the first cell of the first base station and the second cell of the second base station is determined based on the pre-configuration information of the first base station and the downlink resource configuration information. The pairing relationship is sent to the second base station so that the second base station can send the pilot signal configuration information of the second cell to the first base station when there is a transmission association relationship between the first cell and the second cell. In the case that the first base station and the second base station are performing simultaneous data transmission and reception operations on the same frequency, the pairing relationship includes the transmission association relationship between the first cell and the second cell. Based on the pilot signal configuration information of the second cell, the demodulation reference signal of the first cell is mapped onto the corresponding time-frequency resource block; When the corresponding time-frequency resource block is the time-frequency resource block occupied by the pilot signal of the second cell, interference indication information related to the time-frequency resource block is sent to the user terminal in the first cell via RRC signaling, so that the user terminal can demodulate the demodulation reference signal of the first cell according to the interference indication information, and use the demodulation reference signal of the first cell to demodulate the service channel data of the first cell.

2. The optimization method according to claim 1, wherein, Obtaining the downlink resource configuration information of the second base station includes: The downlink resource configuration information of the second base station is obtained through the interface between the first base station and the second base station, wherein the air interface standard of the first base station is different from that of the second base station.

3. The optimization method according to claim 2, wherein, The downlink resource configuration information includes at least one of the following: the cell identifier of the second cell, the downlink frequency information of the second cell, the resource configuration information of the pilot signal, and the transmit power information; The resource configuration information of the pilot signal includes time domain occupancy and frequency domain occupancy.

4. The optimization method according to claim 1, wherein, The pilot signal configuration information of the second cell includes at least one of the following: cell identifier of the second cell, downlink carrier frequency, downlink carrier bandwidth, number of antenna ports, pilot signal resource configuration information, and transmit power information; The resource configuration information of the pilot signal includes time domain occupancy and frequency domain occupancy.

5. The optimization method according to claim 1, wherein, Mapping the demodulation reference signal of the first cell onto the corresponding time-frequency resource block includes: The demodulation reference signal of the service channel of the first cell is mapped onto the corresponding time-frequency resource block.

6. The optimization method according to claim 5, wherein, Sending interference indication information to user terminals within the first cell via RRC signaling includes: The configuration information of the service channel and the configuration information of the demodulation reference signal are sent to the user terminal via RRC signaling; The configuration information of the demodulation reference signal includes configuration parameters, interference indication information, and transmit power information. The configuration parameters of the demodulation reference signal include demodulation reference signal type parameters, demodulation reference signal location parameters, and demodulation reference signal length parameters. The interference indication information is used to indicate whether the demodulation reference signal on the time-frequency resource block has co-channel interference with the pilot signal of the second cell.

7. The optimization method according to claim 6, wherein, The configuration information of the service channel includes mapping type information and data service resource configuration information of the service channel; The data service resource configuration information of the service channel includes time domain occupancy and frequency domain occupancy.

8. A base station, comprising: The memory is configured to store instructions; A processor, coupled to memory, configured to implement the method as described in any one of claims 1-7 based on memory-stored instruction execution.

9. A communication system, comprising: The first base station is the base station as described in claim 8; The second base station is configured to send pilot signal configuration information of the second cell to the first base station based on the pairing relationship obtained from the first base station, in the case where there is a transmission association relationship between the first cell of the first base station and the second cell of the second base station; The user terminal in the first cell is configured to demodulate the demodulation reference signal of the first cell according to the interference indication information sent by the first base station, and to demodulate the service channel data of the first cell using the demodulation reference signal of the first cell.

10. The system according to claim 9, wherein, The pilot signal configuration information includes at least one of the following: cell identifier of the second cell, downlink carrier frequency, downlink carrier bandwidth, number of antenna ports, pilot signal resource configuration information, and transmit power. The resource configuration information of the pilot signal includes time domain occupancy and frequency domain occupancy.

11. The system according to claim 9, wherein, The user terminal is configured to, after receiving configuration information of the service channel and configuration information of the demodulation reference signal sent by the first base station, demodulate the information received by the time-frequency resource block with co-channel interference when the interference indication information included in the configuration information of the demodulation reference signal indicates that the demodulation reference signal has co-channel interference with the pilot signal of the second cell, so as to obtain the demodulated demodulation reference signal, obtain channel state information using the demodulated demodulation reference signal, and demodulate the service channel data of the first cell using the demodulated demodulation reference signal and the channel state information.

12. The system according to claim 11, wherein, The user terminal is configured to demodulate the information received from time-frequency resource blocks that are subject to co-frequency interference using the Serial Interference Cancellation (SIC) algorithm.

13. The system according to claim 9, wherein, The user terminal is configured to, after receiving configuration information of the service channel and configuration information of the demodulation reference signal sent by the first base station, demodulate the information received by the time-frequency resource block where there is no co-channel interference, when the interference indication information included in the configuration information of the demodulation reference signal indicates that the demodulation reference signal has co-channel interference with the pilot signal of the second cell, to obtain the demodulated demodulation reference signal, use the demodulated demodulation reference signal to obtain channel state information, and use the demodulated demodulation reference signal and the channel state information to demodulate the service channel data of the first cell.

14. A computer-readable storage medium, wherein, A computer-readable storage medium stores computer instructions that, when executed by a processor, implement the method as described in any one of claims 1-7.

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