A method, base station, and storage medium for data transmission

Abstract

The present invention discloses a data transmission method, a base station, and a storage medium, which are used to solve the technical problem of high call drop rate in the existing 5G NR system. The method includes: determining a channel state information reference signal resource indicator CRI fed back by a user terminal; determining a set of radio frequency units associated with the CRI from the association relationship between the radio frequency units included in a logical cell and pre-configured channel state information-reference signal CSI-RS resources, where the radio frequency unit includes a remote radio unit RRU or an active antenna processing unit AAU, the logical cell is obtained by merging a plurality of physical cells, and one physical cell corresponds to one radio frequency unit; and sending data to the user terminal through the radio frequency units in the set of radio frequency units associated with the CRI.

Description

Technical Field

[0001] The present invention relates to the field of communications, and in particular, to a method for data transmission, a base station, and a storage medium. Background Art

[0002] In the 5G NR system, a base station network generally uses one RRU corresponding to one logical cell, and macro cell and indoor distribution small cell cooperate to form a network for coverage, so that better signal quality can be obtained in areas at the edge of the macro cell or blocked by buildings.

[0003] However, during the movement of the user terminal, it will continuously switch from one cell to another, and frequent inter-cell handovers increase the probability of handover failure, resulting in an increase in the call drop rate, affecting the operator's KPI statistics and assessment, and affecting the user experience.

[0004] In view of this, how to reduce the call drop rate in the 5G NR system has become an urgent technical problem to be solved. Summary of the Invention

[0005] The present invention provides a method for data transmission, a base station, and a storage medium, so as to solve the technical problem of high call drop rate in the 5G NR system existing in the prior art.

[0006] In a first aspect, to solve the above technical problem, a method for data transmission provided by an embodiment of the present invention is applied to a base station, and the technical solution of the method is as follows:

[0007] Determine a Channel State Information Reference Signal Resource Indicator (CRI) fed back by a user terminal;

[0008] According to the CRI, determine a set of radio frequency units associated with the CRI from the association relationship between the radio frequency units included in the logical cell and the pre-configured Channel State Information - Reference Signal (CSI-RS) resources; wherein, the radio frequency unit includes a Remote Radio Unit (RRU) or an Active Antenna Unit (AAU), the logical cell is obtained by combining multiple physical cells, and one physical cell corresponds to one radio frequency unit;

[0009] Send data to the user terminal through the radio frequency units in the set of radio frequency units associated with the CRI.

[0010] A possible implementation manner, the association relationship of the pre-configured Channel State Information - Reference Signal (CSI-RS) resources includes:

[0011] Radio frequency units with strong mutual interference correspond to different CSI-RS resources, and radio frequency units with weak mutual interference reuse the same CSI-RS resources; when the interference value between the radio frequency units is greater than a preset interference threshold, it is determined that the interference is strong, and when the interference value is less than or equal to the interference threshold, it is determined that the interference is weak.

[0012] A possible implementation manner, the method further includes: determining, from the radio frequency units that receive the uplink signal sent by the user terminal, the radio frequency unit set to which the user terminal currently belongs in the uplink;

[0013] Receiving the data sent by the user terminal through the radio frequency units in the radio frequency unit set to which the user terminal belongs in the uplink by combining them.

[0014] A possible implementation manner, the method further includes:

[0015] If there is a first intersection between the radio frequency unit set associated with the CRI and the radio frequency unit set to which the user terminal belongs in the uplink, performing uplink and downlink data transmission with the user terminal through the radio frequency units in the first intersection.

[0016] A possible implementation manner, determining, from the radio frequency units that receive the uplink signal sent by the user terminal, the radio frequency unit set to which the user terminal currently belongs in the uplink includes:

[0017] Determining, from the radio frequency units that receive the uplink signal sent by the user terminal, the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal;

[0018] Determining the radio frequency unit with the largest quality parameter of the received uplink signal as a radio frequency unit to which the user terminal belongs in the uplink;

[0019] Determining the relative movement direction between the user terminal and the radio frequency unit with the second largest quality parameter of the received uplink signal according to the frequency offset between the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal;

[0020] When the quality parameter of the radio frequency unit with the second largest quality parameter of the received uplink signal is greater than the quality parameter threshold corresponding to the relative movement direction, determining the radio frequency unit with the second largest quality parameter of the received uplink signal as another radio frequency unit to which the user terminal belongs in the uplink.

[0021] A possible implementation manner, determining the relative movement direction between the user terminal and the radio frequency unit with the second largest quality parameter of the received uplink signal includes:

[0022] If the frequency offset symbols corresponding to the uplink signals received by the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal are the same, then:

[0023] The user terminal is moving away from the radio frequency unit with the second largest quality parameter of the received uplink signal;

[0024] If they are different, the user terminal is moving towards the radio frequency unit with the second largest quality parameter of the received uplink signal.

[0025] A possible implementation manner, the method further includes:

[0026] In the logical cell, determine a target radio frequency unit set that meets a preset condition, where the preset condition includes that the received power of the uplink signal sent by the user terminal is greater than a first threshold and the corresponding SINR is greater than a second threshold;

[0027] Perform uplink and downlink data transmission with the user terminal through the radio frequency units in the second intersection of the radio frequency unit set associated with the CRI and the target radio frequency unit set;

[0028] Wherein, when there is an intersection between the target radio frequency unit set corresponding to the user terminal and the target radio frequency unit sets corresponding to other user terminals, the user terminal and other user terminals share the cell resources through frequency division multiplexing; otherwise, the user terminal and other user terminals use the cell resources through space division multiplexing.

[0029] A possible implementation manner, the method further includes: performing uplink and downlink data transmission with the user terminal through the radio frequency units in the intersection of the radio frequency unit set to which the user terminal currently belongs in the uplink and the second intersection.

[0030] In a second aspect, an embodiment of the present invention further provides a base station, including a memory, a transceiver, and a processor:

[0031] The memory is used to store a computer program; the transceiver is used to transmit and receive data under the control of the processor; the processor is used to read the computer program in the memory and execute the following steps;

[0032] Determine the channel state information reference signal resource indicator CRI fed back by the user terminal;

[0033] Determine a set of radio frequency (RF) units associated with the CRI from the association relationship between the RF units included in the logical cell and the pre-configured channel state information-reference signal (CSI-RS) resources; wherein, the RF units include remote radio units (RRUs) or active antenna units (AAUs), the logical cell is obtained by combining multiple physical cells, and one physical cell corresponds to one RF unit.

[0034] Send data to the user terminal through the RF units in the set of RF units associated with the CRI.

[0035] A possible implementation, the processor is further configured to:

[0036] Determine a set of RF units to which the user terminal currently belongs in the uplink from the RF units that receive the uplink signal sent by the user terminal;

[0037] Receive data sent by the user terminal through the RF units in the set of RF units to which the user terminal belongs in the uplink.

[0038] A possible implementation, the processor is further configured to:

[0039] If there is a first intersection between the set of RF units associated with the CRI and the set of RF units to which the user terminal belongs in the uplink, perform uplink and downlink data transmission with the user terminal through the RF units in the first intersection.

[0040] A possible implementation, the processor is further configured to:

[0041] In the logical cell, determine a set of target RF units that meet the preset conditions, where the preset conditions include that the received power of the uplink signal sent by the user terminal is greater than a first threshold and the corresponding signal-to-interference-plus-noise ratio (SINR) is greater than a second threshold;

[0042] Perform uplink and downlink data transmission with the user terminal through the RF units in the second intersection of the set of RF units associated with the CRI and the set of target RF units;

[0043] Wherein, when there is an intersection between the set of target RF units corresponding to the user terminal and the set of target RF units corresponding to other user terminals, the user terminal and other user terminals share the cell resources through frequency division multiplexing; otherwise, the user terminal and other user terminals share the cell resources through spatial division multiplexing.

[0044] A possible implementation, the processor is further configured to: perform uplink and downlink data transmission with the user terminal through the RF units in the intersection of the set of RF units to which the user terminal currently belongs in the uplink and the second intersection.

[0045] In a third aspect, an embodiment of the present invention provides a base station, including:

[0046] A first determination unit, configured to determine a channel state information reference signal resource indicator CRI fed back by a user terminal;

[0047] A second determination unit, configured to determine a set of radio frequency units associated with the CRI from the association relationship between the radio frequency units included in a logical cell and pre-configured channel state information-reference signal CSI-RS resources; wherein, the radio frequency unit includes a radio remote unit RRU or an active antenna processing unit AAU, the logical cell is obtained by combining multiple physical cells, and one physical cell corresponds to one radio frequency unit;

[0048] A transmission unit, configured to send data to the user terminal through the radio frequency units in the set of radio frequency units associated with the CRI.

[0049] In a fourth aspect, an embodiment of the present invention further provides a processor-readable storage medium, where the processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the method described in the first aspect.

[0050] Through the technical solutions in the above one or more embodiments of the embodiments of the present invention, the embodiments of the present invention at least have the following technical effects:

[0051] In the embodiment provided by the present invention, by forming a logical cell from multiple physical cells under the jurisdiction of a base station, what the user terminal can perceive is the logical cell, which equivalently expands the coverage range of the logical cell. When the user terminal moves within a logical cell, although it is necessary to determine in real time the RRU with good communication quality according to the communication environment to communicate with the terminal to ensure communication quality, and there is no cell handover for the user terminal, thus the frequency of the user switching cells can be reduced, and further the call drop rate can be reduced.

[0052] Further, considering the isolation degree of user terminals, the space division multiplexing method is adopted for user terminals that meet the isolation degree to share cell resources, improving the utilization rate of air interface resources, which is implemented by software without adding hardware resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a schematic diagram showing the relationship between the movement of a user terminal and an RRU in a high-speed rail scenario provided by an embodiment of the present invention;

[0054] Figure 2 It is a schematic diagram of RRU configuration in a macro base station scenario provided by an embodiment of the present invention;

[0055] Figure 3 It is a flowchart of a data transmission method provided by an embodiment of the present invention;

[0056] Figure 4 Schematic diagram of CSI-RS resource configuration provided by an embodiment of the present invention Figure 1 ;

[0057] Figure 5 Schematic diagram of CSI-RS resource configuration provided by an embodiment of the present invention Figure 2 ;

[0058] Figure 6 Schematic diagram of downlink data transmission of different user terminals in a high-speed rail scenario provided by an embodiment of the present invention;

[0059] Figure 7 Schematic diagram of the structure of a base station provided by an embodiment of the present invention Figure 1 ;

[0060] Figure 8 Schematic diagram of the structure of a base station provided by an embodiment of the present invention Figure 2 。 Detailed implementation manners

[0061] In the embodiments of the present invention, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0062] In the embodiments of the present application, the term "a plurality of" refers to two or more, and other quantifiers are similar.

[0063] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0064] In the 5G NR system, the coverage range of a cell is smaller than that of 4G. In the area of the macro cell edge or where there is building blockage, the signal of the user terminal is poor, resulting in a bad user experience. To solve this problem, small cell coverage can usually be configured in coverage blind areas such as the cell edge and areas with building blockage to improve the wireless signal quality of users at the macro cell edge or indoor users in buildings and absorb user traffic.

[0065] Since the method of cooperative networking coverage by macro base station cells and indoor distributed small station cells is relatively common, if the user terminal frequently switches between adjacent macro base station cells and small station cells, the probability of handover failure will increase, affecting the handover metrics and the user experience at the same time. In addition, in scenarios of high-speed movement such as the maximum speed of 350 km / h for high-speed trains, if the ordinary networking coverage method is adopted and multiple Active Antenna Units (AAUs) or Radio Remote Units (RRUs) along the railway are used for coverage. Unless otherwise specified below, RRU is used to represent and explain. One RRU corresponds to an ordinary cell. During the train ride, high-speed train users may switch to the next cell in 5 to 10 seconds. Frequent cell switching also increases the probability of cell handover failure, resulting in an increase in the call drop rate, which in turn affects the normal use of the 5G network by users.

[0066] The embodiments of the present application provide a data transmission method, a base station, and a storage medium, which are used to solve the technical problem of high call drop rate in the 5G NR system existing in the prior art.

[0067] Among them, the method and the base station are based on the same inventive concept. Since the principles of the method and the base station for solving problems are similar, the implementation of the base station and the method can be referred to each other, and the repeated parts will not be described again.

[0068] The technical solutions provided by the embodiments of the present application can be applied to various systems, especially 5G systems. For example, the applicable systems can be Global System of Mobile Communication (GSM) systems, Code Division Multiple Access (CDMA) systems, Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) systems, Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, Long Term Evolution Advanced (LTE-A) systems, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) systems, 5G New Radio (NR) systems, etc. Both terminal devices and network devices are included in these various systems. The system may also include a core network part, such as an Evolved Packet System (EPS), a 5G System (5GS), etc.

[0069] The terminal device involved in the embodiments of the present application can be a device that provides voice and / or data connectivity to users, such as a handheld device with wireless connection capabilities, or other processing devices connected to a wireless modem, etc. In different systems, the name of the terminal device may also be different. For example, in a 5G system, the terminal device can be called a user equipment (UE). The wireless terminal device can communicate with one or more core networks (CNs) via a radio access network (RAN). The wireless terminal device can be a user terminal device, such as a mobile phone (or a "cellular" phone) and a computer with a user terminal device. For example, it can be a portable, pocket-sized, handheld, computer-integrated, or vehicle-mounted mobile device that exchanges voice and / or data with the radio access network. For example, devices such as personal communication service (PCS) phones, cordless phones, session initiated protocol (SIP) phones, wireless local loop (WLL) stations, and personal digital assistants (PDAs). The wireless terminal device can also be called a system, subscriber unit, subscriber station, mobile station, mobile, remote station, access point, remote terminal, access terminal, user terminal, user agent, user device, which is not limited in the embodiments of the present application.

[0070] The base station involved in the embodiments of the present application may include multiple cells that provide services to terminals. Depending on specific application scenarios, the base station may also be referred to as an access point, or may be a device in the access network that communicates with wireless terminal devices through one or more sectors over the air interface, or have other names. The network device can be used to mutually replace the received air frames and Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network device can also coordinate the management of the attributes of the air interface. For example, the network device involved in the embodiments of the present application can be a network device (Base Transceiver Station, BTS) in the Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), or a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or an evolved network device (evolutional Node B, eNB or e-NodeB) in the Long Term Evolution (LTE) system, a 5G base station (gNB) in the 5G network architecture (next generation system), or a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc. The embodiments of the present application do not limit this. In some network architectures, the network device may include a centralized unit (centralized unit, CU) node and a distributed unit (distributed unit, DU) node, and the centralized unit and the distributed unit may also be arranged separately geographically.

[0071] The embodiments of the present application are implemented based on logical cells. A logical cell is obtained by merging multiple physical cells. One physical cell corresponds to one radio frequency unit, and the radio frequency unit may include a Remote Radio Unit (RRU) or an Active Antenna Unit (AAU). When the user terminal moves within the logical cell, the base station determines in real time the radio frequency unit that communicates with the user terminal. For the base station, the radio frequency unit that communicates with the user terminal each time may be different, but for the user terminal, it is within the logical cell and there is no frequent cell handover.

[0072] For a user terminal, the communication with the base station includes uplink and downlink data transmissions. In a logical cell, the radio frequency units used by the base station for uplink and downlink can be determined separately. The following embodiments will be exemplarily described separately from determining the radio frequency units used for uplink and downlink.

[0073] First, the radio frequency unit for determining uplink data transmission with the user terminal will be described.

[0074] The radio frequency unit can be an Active Antenna Unit (AAU) or a Radio Remote Unit (RRU). In this embodiment, multiple physical cells under the jurisdiction of the base station form a logical cell, and what the user terminal can perceive is the logical cell, thus equivalently expanding the coverage area of the logical cell. When the user terminal moves within a logical cell, there is no cell handover for the user terminal, which can reduce the frequency of user cell handover and the call drop rate. When the logical cell receives an uplink signal sent by the user terminal, it can determine the set of radio frequency units to which the user terminal currently belongs in the uplink from multiple radio frequency units, and then receive the data sent by the user terminal through the radio frequency units in the set of radio frequency units to which the user terminal belongs in the uplink.

[0075] To determine the set of radio frequency units to which the user terminal currently belongs in the uplink from multiple radio frequency units, it is mainly based on the quality parameters of the uplink signal sent by the user terminal received by the radio frequency unit. For example, the uplink signal is a PRACH (Physical Random Access Channel) signal or an uplink sounding reference signal SRS, etc. The quality parameters of the signal can be signal reception power, signal-to-interference-plus-noise ratio SINR or signal-to-noise ratio, etc., which are not specifically limited here. Preferably, when the user terminal initially accesses, it uses a PRACH signal, and after access, it can use an uplink sounding reference signal SRS.

[0076] Specifically, from the radio frequency units that receive the uplink signal sent by the user terminal, determine the set of radio frequency units to which the user terminal currently belongs in the uplink. Preferably, during implementation, a consecutive number of times can be set, and the radio frequency units in the set of radio frequency units to which the user terminal currently belongs in the uplink are the radio frequency units that are determined to belong consecutively multiple times.

[0077] Determining the set of radio frequency units to which the user terminal currently belongs in the uplink includes:

[0078] S1: Determine the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal from the radio frequency units that receive the uplink signal sent by the user terminal.

[0079] The user terminal is any user terminal within the logical cell. Each of the following embodiments is described by taking one user terminal as an example, which can be denoted as the current user terminal.

[0080] In this step, the quality parameters corresponding to the radio frequency units that receive the uplink signals sent by the user in the logical cell can be sorted to obtain the radio frequency unit with the largest quality parameter and the radio frequency unit with the second largest quality parameter.

[0081] S2: Determine the radio frequency unit with the largest quality parameter of the received uplink signal as a radio frequency unit to which the uplink belongs.

[0082] S3: Determine the relative movement direction of the user terminal and the radio frequency unit with the second largest quality parameter of the received uplink signal according to the frequency offset between the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal.

[0083] In this step, the determination of the relative movement direction is based on the frequency offset symbol corresponding to the radio frequency unit. For example, when the frequency offset symbols corresponding to the received uplink signals of the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal are the same, it is determined that the user terminal is moving in the direction away from the radio frequency unit with the second largest quality parameter of the received uplink signal; on the contrary, that is, when the frequency offset symbols corresponding to the received uplink signals of the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal are different, the user terminal is moving in the direction close to the radio frequency unit with the second largest quality parameter of the received uplink signal.

[0084] S4: When the quality parameter of the radio frequency unit with the second largest quality parameter of the received uplink signal is greater than the quality parameter threshold corresponding to the relative movement direction, determine the radio frequency unit with the second largest quality parameter of the received uplink signal as another radio frequency unit to which the uplink belongs.

[0085] It should be noted that for a user terminal moving to the middle area between two radio frequency units, the quality parameters of the received signals corresponding to the two radio frequency units may be the same. It can be understood that for the two radio frequency units and the user terminal, one is far away and the other is close. In specific implementation, two quality parameter thresholds can be set, and the quality parameter threshold corresponding to the radio frequency unit in the direction away from the user terminal can be set larger, and the quality parameter threshold corresponding to the radio frequency unit close to the user terminal can be set relatively smaller.

[0086] For example, please refer to Figure 1This is a relationship diagram of the movement of a user terminal and an RRU in a high-speed rail scenario provided by an embodiment of the present invention. Taking the quality parameter as the signal reception power as an example, the uplink signal takes the PRACH signal as an example (the PRACH signal can be received through MSG1 (Random Access Message 1)).

[0087] In Figure 1 taking the radio frequency unit as the RRU as an example, the user terminal is located at a fixed position in the high-speed rail. As the high-speed rail moves (taking the movement direction of the high-speed rail as moving to the right as an example), initially the user terminal reaches position 1 (located in RRU2). As the high-speed rail moves to the right, the user terminal reaches position 2 (located in RRU3). As the high-speed rail continues to move to the right, the user terminal reaches position 3 (located in RRU5). RRU1 to RRU6 belong to the same logical cell.

[0088] During the process of the user terminal moving from RRU2 to RRU3, the base station obtains the uplink signals received by RRU1 to RRU6. According to the identifier of the user terminal, it determines from RRU1 to RRU6 that the RRU1 to RRU3 receive the uplink signal PRACH of this user terminal, obtains the reception powers of RRU1 to RRU3, and determines the reception power with the largest peak and the reception power with the second largest peak from the reception powers of RRU1 to RRU3. If it is determined that the peak of the reception power of the uplink PRACH signal received by RRU2 is the largest, it can be determined that RRU2 is an uplink radio frequency unit to which the user terminal currently belongs, or in other words, the user terminal is within the coverage range of RRU2. If it is determined that the peak of the reception power of RRU1 is the second largest, it can be determined that the user terminal is closer to RRU1 than to RRU3.

[0089] Regarding whether RRU1 can be used as the uplink radio frequency unit to which the user terminal currently belongs, further judgment is required. First, it is necessary to determine the relative movement direction of the user terminal with respect to RRU1 according to the frequency offset between RRU2 and RRU1, and then judge whether the peak power of RRU1 is greater than the reception power threshold corresponding to the relative movement direction. If it is greater, it is determined that RRU1 is an radio frequency unit to which the user terminal currently belongs. That is, when it is determined that RRU1 is the uplink radio frequency unit, the uplink radio frequency unit set includes RRU2 and RRU1; otherwise, the uplink radio frequency unit set only includes RRU2.

[0090] According to the frequency offset between RRU2 and RRU1, the relative movement direction of the user terminal with respect to RRU1 can be determined by the following method:

[0091] Determine whether the frequency offset symbol corresponding to the uplink signal received by RRU2 is the same as the frequency offset symbol corresponding to the uplink signal received by RRU1; if the frequency offset symbols of the received signals corresponding to RRU2 and RRU1 are the same, the user terminal is moving away from RRU1; otherwise, the user terminal is moving towards RRU1.

[0092] Still taking Figure 1 as an example, through the respective frequency offset symbols of RRU2 and RRU1, it is determined that the frequency offset symbols of RRU2 and RRU1 are the same. Therefore, it can be determined that the user terminal is moving away from RRU1. At this time, obtain the relative movement direction of the user terminal and RRU1 as the received power threshold corresponding to moving away from RRU1. If the received power of RRU1 exceeds the received power threshold corresponding to moving away from RRU1, then determine that RRU1 is the radio frequency unit to which the user terminal currently belongs in the uplink, that is, the radio frequency units to which the user terminal currently belongs in the uplink include RRU2 and RRU1; if the received power of RRU1 is less than the received power threshold corresponding to moving away from RRU1, then determine that RRU1 is not the radio frequency unit to which the user terminal currently belongs in the uplink, that is, the radio frequency units to which the user terminal currently belongs in the uplink only include RRU2.

[0093] Similarly, in Figure 1 , when the user terminal reaches RRU3, it can be determined that RRU3 is the radio frequency unit with the largest quality parameter, RRU4 is the radio frequency unit with the second largest quality parameter, and the spectrum symbols of RRU4 and RRU3 are opposite. Therefore, it can be determined that the user terminal is moving towards RRU4. At this time, obtain the relative movement direction of the user terminal and RRU4 as the received power threshold corresponding to moving towards RRU4. If the received power of RRU4 exceeds the received power threshold corresponding to moving towards RRU4, then determine that RRU4 is the radio frequency unit to which the user terminal belongs in the uplink, that is, the radio frequency units to which the user terminal belongs in the uplink include RRU3 and RRU4; if the received power of RRU4 is less than the received power threshold corresponding to moving towards RRU4, then determine that RRU4 is not the radio frequency unit to which the user terminal belongs in the uplink, that is, the radio frequency units to which the user terminal belongs in the uplink only include RRU3.

[0094] The above application in the high-speed rail scenario can also be used in scenarios with fixed routes such as subways, trams, and trains.

[0095] The following takes the uplink signal as the uplink sounding reference signal SRS and the quality parameter as the signal-to-interference-plus-noise ratio SINR as an example for illustration. Please refer to Figure 2 the schematic diagram of the macro base station scenario shown. It should be noted that Figure 1 and Figure 2 take the high-speed rail application scenario and the macro base station scenario as examples for illustration, which are only illustrative examples and not limitations. For example, Figure 1The scheme corresponding to the used PRACH signal and the quality parameter being the received power still applies to Figure 2 the scenarios shown below. The following description of the example of Figure 2 still applies to Figure 1 . Specifically, there is no limitation on what signal to use for the uplink and what quality parameter of the corresponding signal. It can be selected according to the actual application.

[0096] In Figure 2 the scenario shown, it consists of a macro station and four small stations surrounding the macro station. The macro station includes RRU1 to RRU3, and each small station corresponds to an RRU( Figure 3 the RRUs corresponding to the 4 small stations in Figure 2 are RRU4 to RRU7). Assume that

[0097] a logical cell in Figure 2 is composed of RRU1 to RRU7. When the user terminal is moving from the current position towards RRU5, among RRU1 to RRU7, the RRUs that receive the uplink sounding reference signal (SRS) reported by the user terminal shown in

[0098] include RRU1, RRU5, and RRU2. Then, according to the signal-to-noise ratio (SNR) corresponding to the SRS received by RRU1, RRU5, and RRU2, the radio frequency unit with the largest SINR is determined to be RRU1, and the second largest SINR is RRU5. RRU1 is determined as one of the radio frequency units in the set of radio frequency units to which the user terminal currently belongs in the uplink. Whether RRU5 is a radio frequency unit to which the user terminal currently belongs in the uplink needs to be determined in combination with the relative movement direction of the user terminal with respect to RRU5 and the SINR threshold corresponding to this relative movement direction.

[0099] The relative movement direction of the user terminal with respect to RRU5 can be determined in the following way:

[0100] Judge whether the frequency offset symbol corresponding to the SRS received by RRU1 is the same as the frequency offset symbol corresponding to the SRS received by RRU5; if they are the same, the user terminal is moving away from RRU5; if they are opposite, the user terminal is moving towards RRU5.

[0101] In the above solution, if the movement of the user terminal relative to the ground is low-speed movement, the frequency offset can be ignored. That is, directly compare the received power of the radio frequency unit with the second-largest mass reference signal with the received power threshold to determine whether the radio frequency unit with the second-largest mass reference signal is the radio frequency unit to which the current user terminal belongs in the uplink. After obtaining the set of radio frequency units to which the user terminal currently belongs in the uplink, the radio frequency units in the radio frequency unit set can be used to merge and receive the uplink data sent by the user terminal to achieve uplink signal gain. For example, if it has been determined that the radio frequency units corresponding to user terminal A include RRU1 and RRU3, RRU1 and RRU3 can be directly used to merge and receive the uplink data of user terminal A.

[0102] Furthermore, when determining the set of radio frequency units to which the user terminal currently belongs in the uplink, in order to improve the accuracy, the radio frequency units that have been determined to belong to the uplink continuously for multiple times can be added to the set of radio frequency units to which the user terminal currently belongs in the uplink.

[0103] Secondly, the radio frequency units for determining downlink data transmission with the user terminal will be described.

[0104] Reference Figure 3 As shown, it is a flowchart of a data transmission method provided by this embodiment. This embodiment will be described by taking the downlink as an example. The Operation and Maintenance Center (OMC) configures the corresponding relationship between the CSI-RS resources for the RRU in the logical cell, configures multiple sets of CSI-RS resources for the logical cell, and 1 RRU corresponds to 1 set of CSI-RS resources.

[0105] S310: Determine the channel state information reference signal resource indicator CRI fed back by the user terminal;

[0106] S320: Determine the set of radio frequency units associated with the CRI from the association relationship between the radio frequency units included in the logical cell and the pre-configured channel state information-reference signal CSI-RS resources;

[0107] S330: Send data to the user terminal through the radio frequency units in the set of radio frequency units associated with the CRI.

[0108] According to the CRI fed back by the user terminal, the corresponding CSI-RS resources can be determined. Thus, according to the association relationship between the radio frequency unit and the pre-configured channel state information-reference signal CSI-RS resources, the set of radio frequency units associated with the CRI can be determined. The downlink data is sent to the user terminal respectively through the radio frequency units in the determined set of radio frequency units associated with the CRI, avoiding interference to other users in the logical cell caused by all radio frequency units in the logical cell sending data simultaneously.

[0109] Preferably, in order to save resources, multiple RRUs can correspond to the same CSI-RS resource, and the number of sets of configured CSI-RS resources depends on the number of RRUs that can interfere with each other due to RRU spacing. It should be understood that in the initial stage of network deployment, multiple sets of periodic CSI-RS / Tracking Reference Signal (TRS) resources need to be configured, and the configuration needs to ensure that the number of CSI-RS / Synchronization Signal and PBCH block (SSB) is in a multiple relationship with the number of combined cells (radio frequency units), and the number of CSI-RS and TRS / SSB beams is the same. Among them, different CSI-RS resources are allocated to radio frequency units with strong interference with each other, and the same CSI-RS resources are reused for radio frequency units with weak interference with each other; when the interference value between the radio frequency units is greater than a preset interference threshold, it indicates strong interference, and when the interference value is less than or equal to the interference threshold, the interference is determined to be weak.

[0110] In one implementation, on the uplink, data sent by the user terminal is received by combining the radio frequency units in the determined radio frequency unit set belonging to the uplink, and on the downlink, data can be sent to the user terminal by the radio frequency units in the radio frequency unit set associated with the CRI. Further, if there is an intersection (i.e., the first intersection) between the radio frequency unit set associated with the CRI and the radio frequency unit set belonging to the uplink, the radio frequency units in the intersection (the first intersection) of the radio frequency unit set associated with the CRI and the radio frequency unit set belonging to the uplink can be used to perform uplink and downlink data transmission with the user terminal.

[0111] For further understanding of downlink radio frequency unit selection, the following is an example. Please refer to Figure 4 and Figure 5 , Figure 4 is a schematic diagram of CSI-RS resource configuration provided by an embodiment of the present invention Figure 1 , Figure 5 is a schematic diagram of CSI-RS resource configuration provided by an embodiment of the present invention Figure 2 .

[0112] Assume Figure 4 and Figure 5 in which RRU1 to RRU6 belong to the same logical cell. In Figure 4 there is interference between two adjacent RRUs, such as interference between RRU1 and RRU2, interference between RRU2 and RRU3, and the interference between RRU1 and RRU3 is weak and can be ignored. Therefore, RRU1 and RRU3 can be configured to use the same CSI-RS resource, Figure 4In the shown logical cell, two adjacent RRU are configured with different CSI-RS resources, and the CSI-RS resources configured in every other RRU are the same. According to the above settings Figure 4 The total number of CSI-RS resources included is 2 (i.e., CSI-RS1 and CSI-RS2).

[0113] In Figure 5 there is interference among RRU1 to RRU3, and the interference between RRU1 and RRU4 is weak and can be ignored. That is to say Figure 5 there is interference among three continuously arranged RRU. Therefore, different CSI-RS resources can be configured for every three continuously sorted RRU (the CSI-RS resources configured for RRU1 to RRU3 in sequence are CSI-RS1 to CSI-RS3), and RRU4 to RRU6 reuse the CSI-RS resources of RRU1 to RRU3 in sequence. Therefore Figure 5 the total number of CSI-RS resources included in the shown logical cell is 3 (i.e., CSI-RS1 to CSI-RS3).

[0114] It should be noted that Figure 4 and Figure 5 both take the RRU set along the high-speed railway line as an example, and the number of RRU and the direction of the transmission beam (the ellipse in the figure represents the beam) are assumed to be the numbers and directions shown in the corresponding figure.

[0115] For another example, please continue to refer to Figure 2 , in a common network, RRU1, RRU2, RRU3, SmallRRU4, SmallRRU5, SmallRRU6, and SmallRRU7 (SmallRRU refers to a small RRU) respectively correspond to a physical cell, for a total of 7 cells. Figure 2 Each RRU in Figure 2 corresponds to a physical cell respectively, and by using the solution of the present invention, the physical cells corresponding to RRU1 to RRU7 in CSIRS can be formed into a logical cell. Suppose there are N CSIRS CSI-RS resources, and N CSIRS>1. Each of the first K CSI-RS resources corresponds to an 8-antenna RRU, and the last one or several CSI-RS resources correspond to all small stations such as DAS / PICO / pole stations (distributed antenna system / pico base station), etc. (corresponding to RRU4 to RRU7, i.e., SmallRRU4\SmallRRU5\SmallRRU6\SmallRRU7). For example, for 4 sets of CSI-RS resources, RRU1\RRU2\RRU3 respectively use different CSI-RS resources (CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3), and RRU4 to RRU7 can reuse one set of CSI-RS resources (CSI-RS resource 4). The small stations SmallRRU are distributed at the edge of the macro cell or in areas with poor coverage for supplementary coverage and absorb traffic. Each CSI-RS resource corresponds to one or more RRUs, and multiple CSI-RS resources are arranged at intervals in the coverage area. As Figure 2 shown, the above example is just a coverage configuration. The configurator can set the number of CSI-RS resources to be reused according to the RRU spacing and the number of RRUs that can interfere with each other. Different CSI-RS / TRS resources need to be allocated between RRUs that are relatively close and interfere with each other, and the same CSI-RS resources can be reused between RRUs with weaker interference.

[0116] Based on Figure 3 the method embodiment shown, the isolation degree can be further considered to improve the utilization rate of the cell air interface resources.

[0117] Specifically, it includes: S410: In the logical cell, determine a set of target radio frequency units that meet the preset conditions. The preset conditions include that the received power of the uplink signal sent by the user terminal is greater than a first threshold, and the corresponding SINR is greater than a second threshold.

[0118] For example, the uplink signal includes a PRACH (Physical Random Access Channel) signal or an uplink sounding reference signal SRS, etc., which is not specifically limited here. Preferably, when the user terminal initially accesses, it uses the PRACH signal, and after access, it can use the uplink sounding reference signal SRS.

[0119] Taking the SRS signal as an example, the main function of this step is to determine, in the radio frequency unit of the logical cell, the radio frequency units that receive the uplink sounding reference signal SRS with a received power RSRP greater than a first threshold and a corresponding SINR greater than a second threshold. That is, to determine the target radio frequency unit set of the user terminal (the current user terminal). The main function of determining the target radio frequency unit set is to judge the isolation degree between different user terminals. Step S410 is a way to determine the target radio frequency unit set of the current user terminal. In a logical cell, there are multiple user terminals. For each other user terminal (user terminals other than the current user terminal), the base station can determine the target radio frequency unit set corresponding to each user terminal through the received power and SINR of the SRS signals reported by the user terminals. If there is no intersection between the target radio frequency unit sets corresponding to different user terminals, it is considered that different user terminals meet the isolation degree requirements, and different user terminals can use the cell resources in a space division multiplexing manner; otherwise, different user terminals can share the cell resources in a frequency division multiplexing manner.

[0120] It can be understood that when determining the radio frequency unit set to which the uplink of the user terminal belongs, the target radio frequency unit set can be determined at the same time, and the radio frequency unit set to which the uplink belongs and the target radio frequency unit set may be the same (for example, when the determination thresholds of the quality parameters adopted are the same).

[0121] S420: Perform uplink and downlink data transmission with the user terminal through the radio frequency units in the second intersection of the radio frequency unit set associated with the CRI and the target radio frequency unit set.

[0122] After determining the target radio frequency unit set of the user terminal (the current user terminal), take the radio frequency units in the intersection (the second intersection) of the radio frequency unit set associated with the CRI determined in the downlink and the target radio frequency unit set to perform uplink data transmission with the user terminal. Or, perform uplink and downlink data transmission with the user terminal through the radio frequency units in the first intersection and the second intersection, that is, take the radio frequency units in the intersection of the target radio frequency unit set, the radio frequency unit set to which the user terminal's uplink belongs, and the radio frequency unit set determined in the downlink.

[0123] Taking three users as an example, user terminals A, B, and C are all connected to this logical cell to perform services. The base station measures the RSRP and SINR of the SRS reported by the three users on each RRU. When the measured RSRP of the SRS is greater than the threshold th_rsrp (the first threshold) and the SINR is greater than the threshold th_sinr (the second threshold), this RRU is determined to be one of the target radio units. If there is no intersection (i.e., no RRU) in the target radio unit sets to which the three user terminals belong, it is considered that the three users meet the isolation requirement, and the three users can use all the PRB resources of the cell in a spatial division multiplexing manner. The base station compares the RRU sets selected by the users for uplink and downlink with the RRU set obtained through isolation calculation, and uses the intersection of the two to process the uplink and downlink data of the user terminals. When there is an intersection between the RRUs selected by the three user terminals for uplink and downlink and the RRUs obtained through isolation calculation, the user terminals belonging to the intersection-related RRUs need to share the PRB resources of the cell bandwidth through frequency division.

[0124] Taking Figure 2 the scenario shown as an example, it is still applicable to the high-speed rail scenario. For the downlink channel selection (determining the RRU to which the downlink belongs), the CSI-RS selected by reporting the CRI by user terminals A, B, and C is one of resource1-4. According to the association relationship between the RRU and the CSI-RS, the RRU to which the user terminal belongs in the downlink is determined. At the same time, the RSRP and SINR of the SRS of the three user terminals measured by each RRU of the base station are compared with the thresholds th_rsrp and th_sinr, and the target radio unit sets to which user terminals A, B, and C belong are calculated respectively. When it is judged according to the user isolation that there is no intersection in the target radio unit sets to which the three user terminals belong, the three user terminals can use all the RPB resources under the cell bandwidth in a spatial division manner, and the intersection of the RRU selected for downlink (or uplink and downlink) and the RRU corresponding to the target radio unit set of the user terminal is used to process the uplink and downlink air interface data of this user. If it is judged according to the user isolation that there is an intersection in the RRUs (target radio unit sets) to which user terminals A and B belong, and there is no intersection between user terminal C and the RRUs to which user terminals A and B belong, then user terminals A and B need to share the PRB resources of the cell through frequency division multiplexing, and user terminal C uses all the PRB resources of the cell in a spatial division multiplexing manner with user terminals A and B. And so on. In this way, without increasing the hardware cost, the utilization efficiency of the cell air interface resources is greatly improved through software methods, and the user perception experience is improved.

[0125] In addition, since high-speed rail network formation is linear, configuration rules can be set according to this characteristic during network formation. Different CSI-RS resources are allocated to radio frequency units with strong mutual interference, and the same CSI-RS resources are reused for radio frequency units with weak mutual interference (when the interference value between radio frequency units is greater than a preset interference threshold, the interference is strong; when the interference value is less than or equal to the interference threshold, the interference is weak. The base station can directly determine whether different user terminals meet the isolation requirement (i.e., whether the interference is weak) according to the configuration rules. For example, Figure 5 the isolation requirement is met between RRU1 and RRU4 to RRU6 (i.e., the interference between them is weak and can be ignored). User terminals under RRU1 can space-division multiplex all PRB resources in the cell bandwidth with user terminals in RRU4 to RRU6. The base station can then transmit the uplink and downlink data of the user terminals according to the RRU to which the user terminals belong.

[0126] Please refer to Figure 6 the schematic diagram of downlink data transmission of different user terminals in the high-speed rail scenario provided by the embodiment of the present invention. For the high-speed rail application scenario, the judgment can be simplified.

[0127] When the CRI reported by user terminal A and user terminal B corresponds to CSI-RS1, according to the association relationship of CSI-RS provided by the OMC, it can be known that CSI-RS1 corresponds to RRU1 and RRU4 (which form the RRU set corresponding to user terminal A). Since user terminal A is far from RRU4, the downlink channel of user terminal A selects RRU1 (i.e., it can be determined through the previous method that RRU1 is the radio frequency unit to which user terminal A belongs in the downlink). If the radio frequency unit to which user terminal A belongs in the uplink is also RRU1, then RRU1 is selected to transmit the downlink data of user terminal A (or RRU1 is selected to perform uplink and downlink data transmission with the user terminal).

[0128] Similarly, the downlink transmission of user terminal B selects RRU4, and the CRI reported by user terminal C corresponds to CSI-RS3, and the downlink transmission selects RRU3. In this way, user terminal A belongs to RRU1, user terminal B belongs to RRU4, and user terminal C belongs to RRU3. Considering that RRU1 and RRU4 are far apart, transmitting together has no interference to user terminal A and user terminal B. At this time, user terminal A and user terminal B can simultaneously use all PRB resources in the cell bandwidth through space-division multiplexing. The base station processes the uplink and downlink data of user terminal A and user terminal B through RRU1 and RRU4 respectively; there is interference between RRU3 and RRU4, so user terminal B and user terminal C share the PRB resources of the cell bandwidth through frequency-division multiplexing.

[0129] In the above - mentioned manner, the resource utilization efficiency of the cell can be greatly improved, and the user experience is enhanced without increasing the hardware cost.

[0130] As Figure 7 shown, a base station provided by an embodiment of the present invention includes a memory 701, a transceiver 702, and a processor 703:

[0131] The memory 701 is used to store computer programs; the transceiver 702 is used to transmit and receive data under the control of the processor 703; the processor 703 is used to:

[0132] Determine a channel state information reference signal resource indicator CRI fed back by a user terminal;

[0133] According to the CRI, determine a set of radio frequency units associated with the CRI from the association relationship between the radio frequency units included in the logical cell and the pre - configured channel state information - reference signal CSI - RS resources; wherein, the radio frequency unit includes a radio remote unit RRU or an active antenna processing unit AAU, the logical cell is obtained by combining multiple physical cells, and one physical cell corresponds to one radio frequency unit; transmit data to the user terminal through the radio frequency units in the set of radio frequency units associated with the CRI.

[0134] In a possible implementation manner, the processor 703 is used to assign different CSI - RS resources to radio frequency units with strong mutual interference, and reuse the same CSI - RS resources for radio frequency units with weak mutual interference; when the interference value between the radio frequency units is greater than a preset interference threshold, it is determined that the interference is strong, and when the interference value is less than or equal to the interference threshold, it is determined that the interference is weak.

[0135] In a possible implementation manner, the processor 703 is further used to:

[0136] Determine a set of radio frequency units to which the user terminal currently belongs in the uplink from the radio frequency units that receive the uplink signal sent by the user terminal; combine and receive the data sent by the user terminal through the radio frequency units in the set of radio frequency units to which the user terminal belongs in the uplink.

[0137] In a possible implementation manner, the processor 703 is further used to:

[0138] Judge whether there is a first intersection between the set of radio frequency units associated with the CRI and the set of radio frequency units to which the user terminal belongs in the uplink. If so, perform uplink and downlink data transmission with the user terminal through the radio frequency units in the first intersection.

[0139] In a possible implementation manner, when determining the set of radio frequency units to which the user terminal currently belongs in the uplink from the radio frequency units that receive the uplink signal sent by the user terminal, the processor 703 specifically is used to:

[0140] From the radio frequency units that receive the uplink signals sent by the user terminal,

[0141] determine the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second-largest quality parameter of the received uplink signal;

[0142] Determine the radio frequency unit with the largest quality parameter of the received uplink signal as a radio frequency unit to which the uplink belongs;

[0143] According to the frequency offset between the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second-largest quality parameter of the received uplink signal, determine the relative movement direction of the user terminal and the radio frequency unit with the second-largest quality parameter of the received uplink signal;

[0144] When the quality parameter of the radio frequency unit with the second-largest quality parameter of the received uplink signal is greater than the quality parameter threshold corresponding to the relative movement direction, determine the radio frequency unit with the second-largest quality parameter of the received uplink signal as another radio frequency unit to which the uplink belongs.

[0145] In a possible implementation manner, when determining the relative movement direction of the user terminal and the radio frequency unit with the second-largest quality parameter of the received uplink signal, the processor 703 is specifically configured to:

[0146] If the frequency offset signs corresponding to the received uplink signals of the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second-largest quality parameter of the received uplink signal are the same, then:

[0147] The user terminal is moving in a direction away from the radio frequency unit with the second-largest quality parameter of the received uplink signal;

[0148] If they are different, the user terminal is moving in a direction closer to the radio frequency unit with the second-largest quality parameter of the received uplink signal.

[0149] In a possible implementation manner, the processor 703 is further configured to:

[0150] In the logical cell, determine a target radio frequency unit set that meets the preset conditions, where the preset conditions include that the received power RSRP of the uplink sounding reference signal SRS sent by the user terminal is greater than a first threshold and the corresponding SINR is greater than a second threshold;

[0151] Perform uplink and downlink data transmission with the user terminal through the radio frequency units in the second intersection of the radio frequency unit set associated with the CRI and the target radio frequency unit set;

[0152] When there is an intersection between the target radio frequency unit set corresponding to the user terminal and the target radio frequency unit sets corresponding to other user terminals, the user terminal and the other user terminals share the cell resources through frequency division multiplexing; otherwise, the user terminal and the other user terminals use all PRB resources in the cell through spatial division multiplexing.

[0153] A possible implementation manner, the processor 703 is further configured to: perform uplink and downlink data transmission with the user terminal through a radio frequency unit in the intersection of the radio frequency unit set to which the user terminal currently belongs in the uplink and the second intersection.

[0154] Wherein, in Figure 7 the bus architecture may include any number of interconnected buses and bridges, specifically various circuits of one or more processors represented by the processor 703 and the memory represented by the memory 701 are linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be further described herein. The bus interface provides an interface. The transceiver 702 may be a plurality of components, that is, including a transmitter and a receiver, and provides a unit for communicating with various other devices on a transmission medium, and these transmission mediums include wireless channels, wired channels, optical fiber cables, and other transmission mediums. The processor 703 is responsible for managing the bus architecture and general processing, and the memory 701 may store data used by the processor 703 when performing operations.

[0155] The processor 703 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and the processor may also adopt a multi-core architecture.

[0156] It should be noted here that the above base station provided in the embodiment of the present invention can implement all method steps implemented by the above method embodiment, and can achieve the same technical effects. The same parts and beneficial effects as those in the method embodiment will not be specifically described in this embodiment.

[0157] Based on the same inventive concept, an embodiment of the present invention provides a base station. For the specific implementation manner of the data transmission method of this base station, reference may be made to the description in the method embodiment part. The repeated parts will not be elaborated. Please refer to Figure 8 and this base station includes:

[0158] The first determination unit 801 is configured to determine a channel state information reference signal resource indicator CRI fed back by a user terminal;

[0159] The second determination unit 802 is configured to determine a set of radio frequency units associated with the CRI from the association relationship between the radio frequency units included in a logical cell and pre-configured channel state information-reference signal CSI-RS resources; wherein, the radio frequency units include radio remote units RRU or active antenna processing units AAU, the logical cell is obtained by combining a plurality of physical cells, and one physical cell corresponds to one radio frequency unit;

[0160] The transmission unit 803 is configured to send data to the user terminal through the radio frequency units in the set of radio frequency units associated with the CRI.

[0161] A possible implementation manner, the association relationship of pre-configured channel state information-reference signal CSI-RS resources includes: radio frequency units with strong interference with each other correspond to different CSI-RS resources, and radio frequency units with weak interference with each other reuse the same CSI-RS resources; when the interference value between the radio frequency units is greater than a preset interference threshold, it is determined that the interference is strong, and when the interference value is less than or equal to the interference threshold, it is determined that the interference is weak.

[0162] A possible implementation manner, the base station further includes a third determination unit, configured to: determine a set of radio frequency units to which the user terminal currently belongs in the uplink from the radio frequency units that receive the uplink signal sent by the user terminal;

[0163] The transmission unit 803 is specifically configured to merge and receive the data sent by the user terminal through the radio frequency units in the set of radio frequency units to which the uplink belongs.

[0164] A possible implementation manner, the transmission unit 803 is further configured to determine whether there is a first intersection between the set of radio frequency units associated with the CRI and the set of radio frequency units to which the uplink belongs. If so, perform uplink and downlink data transmission with the user terminal through the radio frequency units in the first intersection.

[0165] A possible implementation manner, the third determination unit is configured to determine a set of radio frequency units to which the user terminal currently belongs in the uplink from the radio frequency units that receive the uplink signal sent by the user terminal, including:

[0166] Determine the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal from the radio frequency units that receive the uplink signal sent by the user terminal;

[0167] Determine the radio frequency unit with the largest quality parameter of the received uplink signal as a radio frequency unit to which the uplink belongs;

[0168] Determine the relative motion direction of the user terminal and the radio frequency unit with the second largest quality parameter of the received uplink signal according to the frequency offset between the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal;

[0169] When the quality parameter of the radio frequency unit with the second largest quality parameter of the received uplink signal is greater than the quality parameter threshold corresponding to the relative motion direction, determine the radio frequency unit with the second largest quality parameter of the received uplink signal as another radio frequency unit to which the uplink belongs.

[0170] A possible implementation manner, the third determining unit is further configured to determine the relative motion direction of the user terminal and the radio frequency unit with the second largest quality parameter of the received uplink signal, including:

[0171] If the frequency offset signs corresponding to the received uplink signals of the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal are the same, then:

[0172] The user terminal moves in a direction away from the radio frequency unit with the second largest quality parameter of the received uplink signal;

[0173] If they are different, the user terminal moves in a direction close to the radio frequency unit with the second largest quality parameter of the received uplink signal.

[0174] A possible implementation manner, the second determining unit 802 is further configured to: in the logical cell, determine a target radio frequency unit set that meets a preset condition, where the preset condition includes that the received power of the uplink signal sent by the user terminal is greater than a first threshold and the corresponding SINR is greater than a second threshold;

[0175] The transmission unit 803 is configured to perform uplink and downlink data transmission with the user terminal through the radio frequency units in the second intersection of the radio frequency unit set associated with the CRI and the target radio frequency unit set;

[0176] Wherein, when there is an intersection between the target radio frequency unit set corresponding to the user terminal and the target radio frequency unit sets corresponding to other user terminals, the user terminal and other user terminals share the cell resources through frequency division multiplexing; otherwise, the user terminal and other user terminals share the cell resources through space division multiplexing.

[0177] A possible implementation manner, the transmission unit 803 is further configured to: perform uplink and downlink data transmission with the user terminal through the radio frequency units in the intersection of the current uplink-attributed radio frequency unit set of the user terminal and the second intersection.

[0178] It should be noted that the division of units in the embodiments of the present application is illustrative, merely a logical function division, and there may be other division methods in actual implementation. In addition, in each embodiment of the present application, the functional units may be integrated into a processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above integrated units may be implemented in the form of hardware or in the form of software functional units.

[0179] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks, or optical discs.

[0180] It should be noted here that the above base station provided by the embodiments of the present invention can implement all the method steps implemented by the above method embodiments and can achieve the same technical effects. The same parts and beneficial effects as those in the method embodiments will not be specifically described in this embodiment.

[0181] Based on the same inventive concept, the embodiments of the present invention also provide a processor-readable storage medium storing a computer program for causing the processor to execute the data transmission method as described above.

[0182] The processor-readable storage medium may be any available medium or data storage device accessible by the processor, including but not limited to magnetic memories (such as floppy disks, hard disks, magnetic tapes, magneto-optical discs (MO), etc.), optical memories (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor memories (such as ROM, EPROM, EEPROM, non-volatile memories (NANDFLASH), solid-state drives (SSD)).

[0183] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0184] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0185] These processor-executable instructions can also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the processor-readable memory generate a manufactured article including an instruction means that implements the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0186] These processor-executable instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0187] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A method for data transmission, applied to a base station, characterized in that, The method includes: Determining a Channel State Information Reference Signal Resource Indicator (CRI) fed back by a user terminal; Determining, according to the CRI, a set of radio frequency (RF) units associated with the CRI from the association relationship between the RF units included in a logical cell and pre-configured Channel State Information-Reference Signal (CSI-RS) resources; wherein, the RF units include Remote Radio Units (RRUs) or Active Antenna Units (AAUs), the logical cell is obtained by combining a plurality of physical cells, and one physical cell corresponds to one RF unit; Sending data to the user terminal through the RF units in the set of RF units associated with the CRI; Determining, from the RF units that receive the uplink signal sent by the user terminal, a set of RF units to which the user terminal currently belongs in the uplink; Combining and receiving the data sent by the user terminal through the RF units in the set of RF units to which the user terminal belongs in the uplink; Wherein, determining, from the RF units that receive the uplink signal sent by the user terminal, a set of RF units to which the user terminal currently belongs in the uplink includes: Determining, from the RF units that receive the uplink signal sent by the user terminal, an RF unit with the largest quality parameter of the received uplink signal and an RF unit with the second largest quality parameter of the received uplink signal; Determining the RF unit with the largest quality parameter of the received uplink signal as an RF unit to which the user terminal belongs in the uplink; Determining the relative movement direction of the user terminal and the RF unit with the second largest quality parameter of the received uplink signal according to the frequency offset between the RF unit with the largest quality parameter of the received uplink signal and the RF unit with the second largest quality parameter of the received uplink signal; When the quality parameter of the RF unit with the second largest quality parameter of the received uplink signal is greater than a quality parameter threshold corresponding to the relative movement direction, determining the RF unit with the second largest quality parameter of the received uplink signal as another RF unit to which the user terminal belongs in the uplink.

2. The method according to claim 1, characterized in that, The association relationship of the pre-configured CSI-RS resources includes: RF units with strong interference with each other correspond to different CSI-RS resources, and RF units with weak interference with each other reuse the same CSI-RS resources; when the interference value between the RF units is greater than a preset interference threshold, it is determined that the interference is strong, and when the interference value is less than or equal to the interference threshold, it is determined that the interference is weak.

3. The method according to claim 1, characterized in that, It further includes: If there is a first intersection between the set of RF units associated with the CRI and the set of RF units to which the user terminal belongs in the uplink, performing uplink and downlink data transmission with the user terminal through the RF units in the first intersection.

4. The method according to claim 1, characterized in that, Determining the relative movement direction of the user terminal and the RF unit with the second largest quality parameter of the received uplink signal includes: If the frequency offset signs corresponding to the uplink signals received by the RF unit with the largest quality parameter of the received uplink signal and the RF unit with the second largest quality parameter of the received uplink signal are the same, then the user terminal is moving in a direction away from the RF unit with the second largest quality parameter of the received uplink signal; If they are different, then the user terminal is moving in a direction closer to the RF unit with the second largest quality parameter of the received uplink signal.

5. The method according to claim 1, characterized in that, It further includes: In the logical cell, determine a target radio frequency unit set that meets a preset condition, where the preset condition includes that the received power of the uplink signal sent by the user terminal is greater than a first threshold, and the corresponding SINR is greater than a second threshold; Perform uplink and downlink data transmission with the user terminal through radio frequency units in the second intersection of the radio frequency unit set associated with the CRI and the target radio frequency unit set; Wherein, when there is an intersection between the target radio frequency unit set corresponding to the user terminal and the target radio frequency unit sets corresponding to other user terminals, the user terminal and other user terminals share cell resources through a frequency division multiplexing method; otherwise, the user terminal and other user terminals use cell resources through a space division multiplexing method.

6. The method according to claim 5, characterized in that, Further includes: Perform uplink and downlink data transmission with the user terminal through radio frequency units in the intersection of the radio frequency unit set to which the user terminal currently belongs in the uplink and the second intersection.

7. A base station, characterized in that, Includes a memory, a transceiver, and a processor: The memory is used to store computer programs; The transceiver is used to transmit and receive data under the control of the processor; The processor is used to read the computer program in the memory and execute the following steps; Determine a channel state information reference signal resource indicator CRI fed back by the user terminal; According to the CRI, determine a radio frequency unit set associated with the CRI from the association relationship between the radio frequency units included in the logical cell and pre-configured channel state information-reference signal CSI-RS resources; wherein, the radio frequency unit includes a radio remote unit RRU or an active antenna processing unit AAU, the logical cell is obtained by combining multiple physical cells, and one physical cell corresponds to one radio frequency unit; Send data to the user terminal through radio frequency units in the radio frequency unit set associated with the CRI; Determine the radio frequency unit set to which the user terminal currently belongs in the uplink from the radio frequency units that receive the uplink signal sent by the user terminal; Receive data sent by the user terminal through radio frequency units in the radio frequency unit set to which the user terminal belongs in the uplink; Wherein, determining the radio frequency unit set to which the user terminal currently belongs in the uplink from the radio frequency units that receive the uplink signal sent by the user terminal includes: Determine the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal from the radio frequency units that receive the uplink signal sent by the user terminal; Determine the radio frequency unit with the largest quality parameter of the received uplink signal as a radio frequency unit to which the user terminal belongs in the uplink; Determine the relative movement direction of the user terminal and the radio frequency unit with the second largest quality parameter of the received uplink signal according to the frequency offset between the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal; When the quality parameter of the radio frequency unit with the second largest quality parameter of the received uplink signal is greater than the quality parameter threshold corresponding to the relative movement direction, determine the radio frequency unit with the second largest quality parameter of the received uplink signal as another radio frequency unit to which the user terminal belongs in the uplink.

8. The base station according to claim 7, characterized in that, The processor is further used for: If there is a first intersection between the radio frequency unit set associated with the CRI and the radio frequency unit set to which the uplink belongs, the uplink and downlink data transmission with the user terminal is performed through the radio frequency units in the first intersection.

9. The base station according to claim 8, characterized in that, The processor is further configured to: In the logical cell, determine a target radio frequency unit set that meets a preset condition, where the preset condition includes that the received power of the uplink signal sent by the user terminal is greater than a first threshold and the corresponding SINR is greater than a second threshold; Perform uplink and downlink data transmission with the user terminal through the radio frequency units in the second intersection of the radio frequency unit set associated with the CRI and the target radio frequency unit set; Wherein, when there is an intersection between the target radio frequency unit set corresponding to the user terminal and the target radio frequency unit sets corresponding to other user terminals, the user terminal and other user terminals share the cell resources through frequency division multiplexing; otherwise, the user terminal and other user terminals use the cell resources through spatial division multiplexing.

10. A base station, characterized in that, Including: A first determination unit, configured to determine a channel state information reference signal resource indicator CRI fed back by the user terminal; A second determination unit, configured to determine a radio frequency unit set associated with the CRI from the association relationship between the radio frequency units included in the logical cell and the pre-configured channel state information-reference signal CSI-RS resources; wherein, the radio frequency unit includes a radio remote unit RRU or an active antenna processing unit AAU, the logical cell is obtained by combining a plurality of physical cells, and one physical cell corresponds to one radio frequency unit; A transmission unit, configured to send data to the user terminal through the radio frequency units in the radio frequency unit set associated with the CRI; A third determination unit, configured to determine, from the radio frequency units that receive the uplink signal sent by the user terminal, the radio frequency unit set to which the user terminal currently belongs in the uplink; The transmission unit is further configured to combine and receive the data sent by the user terminal through the radio frequency units in the radio frequency unit set to which the uplink belongs; Wherein, determining the radio frequency unit set to which the user terminal currently belongs in the uplink from the radio frequency units that receive the uplink signal sent by the user terminal includes: Determining, from the radio frequency units that receive the uplink signal sent by the user terminal, the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal; Determining the radio frequency unit with the largest quality parameter of the received uplink signal as a radio frequency unit to which the uplink belongs; Determining the relative movement direction between the user terminal and the radio frequency unit with the second largest quality parameter of the received uplink signal according to the frequency offset between the radio frequency unit with the largest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal; When the quality parameter of the radio frequency unit with the second largest quality parameter of the received uplink signal is greater than the quality parameter threshold corresponding to the relative movement direction, determining the radio frequency unit with the second largest quality parameter of the received uplink signal as another radio frequency unit to which the uplink belongs.

11. A processor-readable storage medium, characterized in that, The processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the method according to any one of claims 1 to 6.

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