CN115250529A - Data transmission method, base station and storage medium - Google Patents

Abstract

The invention discloses a data transmission method, a base station and a storage medium, which are used for solving the technical problem of higher call drop rate of a 5G NR system in the prior art, and the method comprises the following steps: determining a channel state information reference signal resource indicator (CRI) fed back by a user terminal; determining a radio frequency unit set associated with the CRI from the association relationship between the radio frequency units contained in the logic cell and the pre-configured channel state information-reference signal (CSI-RS) resources according to the CRI; the radio frequency unit comprises a radio remote unit RRU or an active antenna processing unit AAU, the logic cell is obtained by combining a plurality of physical cells, and one physical cell corresponds to one radio frequency unit; and transmitting data to the user terminal through the radio frequency unit in the radio frequency unit set associated with the CRI.

Description

A data transmission method, base station and storage medium

technical field

The present invention relates to the field of communications, and in particular, to a data transmission method, a base station and a storage medium.

Background technique

In the 5G NR system, the base station network generally uses one RRU to correspond to one logical cell, and the macro cell and the room-division small cell cooperate with the networking coverage, so that the edge of the macro cell or the area blocked by the building can also obtain a better signal quality.

However, in the process of moving the user terminal, it will continuously switch from one cell to another. Frequent handovers between cells increase the probability of handover failure, which leads to an increase in the call drop rate and affects the operator's KPI statistical assessment. user experience.

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

The present invention provides 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.

In the first aspect, in order to solve the above-mentioned technical problem, a data transmission method provided in an embodiment of the present invention is applied to a base station, and the technical solution of the method is as follows:

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

According to the CRI, the radio frequency unit set associated with the CRI is determined from the association relationship between the radio frequency unit included in the logical cell and the preconfigured channel state information-reference signal CSI-RS resource; wherein the radio frequency unit includes a radio frequency puller A 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;

The data is sent to the user terminal through the radio frequency unit in the radio frequency unit set associated with the CRI.

A possible implementation manner, the preconfigured channel state information-reference signal CSI-RS resource association relationship includes:

The radio frequency units with strong mutual interference correspond to different CSI-RS resources, and the radio frequency units with weak mutual interference reuse the same CSI-RS resources; the interference value between the radio frequency units is greater than the preset interference threshold value, It is determined that the interference is strong, and the interference value is less than or equal to the interference threshold to determine that the interference is weak.

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

The data sent by the user terminal is received by combining the radio frequency units in the uplink home radio frequency unit set.

A possible implementation, the method further includes:

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, perform uplink and downlink data transmission with the user terminal through the radio frequency unit in the first intersection set.

In a possible implementation manner, from the radio frequency unit that receives the uplink signal sent by the user terminal, determining the radio frequency unit set to which the user terminal currently belongs in the uplink includes:

Determine, 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;

Determine the radio frequency unit with the largest quality parameter of the received uplink signal as an uplink home radio frequency unit;

According to the frequency offset between the radio frequency unit with the highest 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 user terminal and the radio frequency with the second largest quality parameter of the received uplink signal The relative movement direction of the unit;

When the quality parameter of the radio frequency unit with the second largest received uplink signal quality parameter is greater than the quality parameter threshold corresponding to the relative motion direction, the radio frequency unit with the next largest received uplink signal quality parameter is determined as another uplink home radio frequency unit.

A possible implementation manner, 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 includes:

If the radio frequency unit with the highest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal receive the same frequency offset symbol for the uplink signal, then:

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

If not, the user terminal moves in a direction close to the radio frequency unit with the second largest quality parameter of the received uplink signal.

A possible implementation, the method further includes:

In the logical cell, determine a target radio frequency unit set that satisfies 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 unit in the second intersection set 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 set corresponding to other user terminals, the user terminal and other user terminals share cell resources through frequency division multiplexing; Cell resources are used between the user terminal and other user terminals through space division multiplexing.

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

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

a memory for storing a computer program; a transceiver for sending and receiving data under the control of the processor; a processor for reading the computer program in the memory and executing the following steps;

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

According to the CRI, the radio frequency unit set associated with the CRI is determined from the association relationship between the radio frequency unit included in the logical cell and the preconfigured channel state information-reference signal CSI-RS resource; wherein the radio frequency unit includes a radio frequency puller A 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;

The data is sent to the user terminal through the radio frequency unit in the radio frequency unit set associated with the CRI.

In a possible implementation manner, the processor is further used for:

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 data sent by the user terminal is received through the radio frequency unit in the uplink home radio frequency unit set.

In a possible implementation manner, 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, perform uplink and downlink data transmission with the user terminal through the radio frequency unit in the first intersection set.

In a possible implementation manner, the processor is further used for:

In the logical cell, determine a target radio frequency unit set that satisfies 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 unit in the second intersection set 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 set corresponding to other user terminals, the user terminal and other user terminals share cell resources through frequency division multiplexing; Cell resources are shared between the user terminal and other user terminals through space division multiplexing.

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

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

a first determining unit, configured to determine the channel state information reference signal resource indicator CRI fed back by the user terminal;

The second determining unit is configured to determine, according to the CRI, the radio frequency unit set associated with the CRI from the association relationship between the radio frequency unit included in the logical cell and the preconfigured channel state information-reference signal CSI-RS resource; wherein, The radio frequency unit includes a remote radio 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;

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

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 configured to cause the processor to execute the method described in the first aspect Methods.

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

In the embodiment provided by the present invention, by forming multiple physical cells under the jurisdiction of the base station into a logical cell, what the user terminal can perceive is the logical cell, which effectively expands the coverage of the logical cell. When moving within a logical cell, although it is necessary to determine the RRU with good communication quality in real time according to the communication environment to communicate with the terminal to ensure the communication quality, and there is no cell handover for the user terminal, which can reduce the frequency of the user switching cells, and then Reduce call drop rate.

Further, considering the isolation degree of user terminals, space division multiplexing is used to share cell resources among user terminals that satisfy the isolation degree, and the utilization rate of air interface resources is provided, which is realized by software without increasing hardware resources.

Description of drawings

1 is a schematic diagram of the relationship between user terminal mobility and RRU in a high-speed rail scenario provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of an RRU configuration in a macro site scenario provided by an embodiment of the present invention;

3 is a flowchart of a data transmission method provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram 1 of a CSI-RS resource configuration provided by an embodiment of the present invention;

FIG. 5 is a second schematic diagram of a CSI-RS resource configuration provided by an embodiment of the present invention;

6 is a schematic diagram of downlink data transmission of different user terminals in a high-speed rail scenario provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram 1 of a base station according to an embodiment of the present invention;

FIG. 8 is a second schematic structural diagram of a base station according to an embodiment of the present invention.

Detailed ways

In this embodiment of the present invention, the term "and/or" describes the association relationship between associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists alone, A and B exist simultaneously, and B exists alone these three situations. The character "/" generally indicates that the associated objects are an "or" relationship.

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

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of 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.

In the 5G NR system, the coverage of the cell is smaller than that of 4G. In the edge of the macro cell or in the area blocked by the building, the signal of the user terminal is poor, resulting in a poor user experience. In order to solve this problem, usually small cell cells can be configured for coverage in coverage blind areas such as cell edges and areas blocked by buildings, so as to improve the wireless signal quality of macro cell edge users or indoor users in buildings and absorb user traffic.

Since this method of network coverage by the macro cell and the small cell in the room is relatively common, if the user terminal frequently switches between the adjacent macro cell and the small cell, the probability of handover failure will increase and the handover will be affected. indicators, while affecting the user experience. In addition, in high-speed moving scenarios such as the maximum speed of high-speed rail 350km/h, if the normal network coverage method is used, multiple Active Antenna Units (AAUs) or Radio Remote Units (Radio Remote Units) along the railway line will be used. Unit, RRU) for coverage, and RRU is used to represent the description without special instructions below. One RRU corresponds to one common cell, and high-speed rail users may switch to the next cell within 5 to 10 seconds during the ride. Frequent cell switching increases the probability of cell handover failure, which increases the call drop rate and affects users. Use the 5G network normally.

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

The method and the base station are conceived based on the same application. 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 repeated descriptions will not be repeated here.

The technical solutions provided in the embodiments of the present application can be applied to various systems, especially 5G systems. For example, applicable systems may be global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) general packet radio Service (general packet radio service, GPRS) system, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, advanced long-term Evolution (long term evolution advanced, LTE-A) system, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) system, 5G New Radio (New Radio, NR) system, etc. . These various systems include terminal equipment and network equipment. The system may also include a core network part, such as an evolved packet system (Evloved Packet System, EPS), a 5G system (5GS), and the like.

The terminal device involved in the embodiments of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem. In different systems, the names of the terminal equipment may be different. For example, in a 5G system, the terminal equipment may be called user equipment (User Equipment, UE). Wireless terminal equipment can communicate with one or more core networks (Core Network, CN) via a radio access network (Radio Access Network, RAN). The wireless terminal equipment can be user terminal equipment, such as mobile phones (or "cellular"). "telephone) and computers with user terminal equipment, eg portable, pocket-sized, hand-held, computer built-in or vehicle mounted mobile devices, which exchange language and/or data with the radio access network. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants, PDA) and other devices. A wireless terminal device may also be referred to as a system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, A remote terminal (remote terminal), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), and a user device (user device) are not limited in the embodiments of the present application.

The base station involved in the embodiments of the present application may include multiple cells that provide services for the terminal. Depending on the specific application, the base station may also be called an access point, or may be a device in the access network that communicates with wireless terminal equipment through one or more sectors on the air interface, or other names. The network equipment can be used to exchange received air frames with Internet Protocol (IP) packets, and act as a router between the wireless terminal equipment and the rest of the access network, where the rest of the access network can include the Internet. Protocol (IP) communication network. The network devices may also coordinate attribute management for the air interface. For example, the network device involved in the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in a Global System for Mobile Communications (GSM) or a Code Division Multiple Access (Code Division Multiple Access, CDMA). , it can also be a network device (NodeB) in a Wide-band Code Division Multiple Access (WCDMA), or it can be an evolved network device ( evolutional Node B, eNB or e-NodeB), a 5G base station (gNB) in a 5G network architecture (next generation system), or a Home evolved Node B (HeNB), a relay node (relay node), A home base station (femto), a pico base station (pico), etc., are not limited in the embodiments of the present application. In some network structures, network devices may include centralized unit (CU) nodes and distributed unit (DU) nodes, which may also be geographically separated.

The embodiments of the present application are implemented based on logical cells, which are obtained by combining multiple physical cells. One physical cell corresponds to one radio frequency unit. The radio frequency unit may include a remote radio unit RRU or an active antenna processing unit AAU. When the user terminal moves in the logical cell, the base station determines the radio frequency unit that communicates with the user terminal in real time. For the base station, the radio frequency unit that communicates with the user terminal may be different each time. In the cell, there is no frequent cell handover.

For the user terminal, the communication with the base station includes uplink and downlink data transmission. In a logical cell, the radio frequency units used by the base station for uplink and downlink can be determined separately. The following embodiments determine the radio frequency units used in uplink and downlink respectively. Exemplary descriptions are given separately.

First, the radio frequency unit that determines the uplink to perform data transmission with the user terminal is described.

The radio frequency unit may be an active antenna processing unit (Active Antenna Unit, AAU) or a remote antenna processing unit (Radio Remote Unit, RRU). In this embodiment, multiple physical cells under the jurisdiction of the base station are formed into a logical cell, and what the user terminal can perceive is the logical cell, which effectively expands the coverage of the logical cell. When the user terminal moves in a logical cell, For the user terminal, no cell handover is performed, so that the frequency of the user switching between cells can be reduced, and the call drop rate can be reduced. When the logical cell receives the uplink signal sent by the user terminal, it can determine the radio frequency unit set that the user terminal currently belongs to in the uplink from multiple radio frequency units, and then receive the data sent by the user terminal through the radio frequency unit in the uplink-homed radio frequency unit set.

Determining the set of radio frequency units that the user terminal currently belongs to in the uplink from multiple radio frequency units is mainly based on the quality parameter of the uplink signal sent by the user terminal received by the radio frequency unit. For example, the uplink signal is PRACH (Physical Random Access Channel). channel) signal or uplink sounding reference signal SRS, etc. The quality parameter of the signal may be signal received power, signal-to-interference-to-noise ratio SINR or signal-to-noise ratio, etc., which are not specifically limited here. Preferably, the user terminal uses the PRACH signal during initial access, and can use the uplink sounding reference signal SRS after access.

Specifically, from the radio frequency units that receive the uplink signal sent by the user terminal, determine the radio frequency unit set to which the user terminal currently belongs in the uplink. The radio frequency units in the home radio frequency unit set are determined as the home radio frequency units for many consecutive times.

Determining the radio frequency unit set that the user terminal currently belongs to in the uplink includes:

S1: Determine the radio frequency unit with the highest 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.

The user terminal is any user terminal in the logical cell, and the following embodiments are described by taking one user terminal as an example, which may be recorded as the current user terminal.

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

S2: Determine the radio frequency unit with the highest quality parameter of the received uplink signal as an uplink home radio frequency unit.

S3: According to the frequency offset between the radio frequency unit with the highest 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 second largest quality parameter of the user terminal and the received uplink signal The relative motion direction of the RF unit.

In this step, the judgment of the relative movement direction is determined by the frequency offset symbol corresponding to the radio frequency unit. For example, when the radio frequency unit with the highest quality parameter of the received uplink signal and the radio frequency with the second largest quality parameter of the received uplink signal When the frequency offset symbols corresponding to the uplink signal received by the unit are the same, it is determined that 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; otherwise, the quality of the received uplink signal is The radio frequency unit with the largest parameter and the radio frequency unit with the second largest quality parameter of the received uplink signal receive different frequency offset symbols of the uplink signal, then the user terminal is closer to the quality parameter of the received uplink signal. Directional movement of the large RF unit.

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 motion direction, determine that the radio frequency unit with the next largest quality parameter of the received uplink signal is another uplink home radio frequency unit.

It should be noted that, for a user terminal that moves to the middle area of 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 one of the two radio frequency units and the user terminal is Far away, one is close. In the specific implementation, two quality parameter thresholds can be set. The quality parameter threshold corresponding to the radio frequency unit in the direction away from the user terminal is set larger, and the quality parameter threshold corresponding to the radio frequency unit close to the user terminal is set. relatively small.

For example, referring to FIG. 1 is a diagram of a relationship between user terminal movement and RRU in a high-speed rail scenario provided by an embodiment of the present invention, take the quality parameter as the signal received power as an example, and the uplink signal takes the PRACH signal as an example (the MSG1 (random access) signal can be used as an example. Message a) Receive PRACH signal).

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

In the process of the user terminal moving from RRU2 to RRU3, the base station obtains the uplink signals received by RRU1 to RRU6, and according to the identifier of the user terminal, determines from RRU1 to RRU6 that the uplink signal PRACH of the user terminal is received from RRU1 to RRU6. The RRU3 obtains the received power of RRU1 to RRU3, and determines the received power with the largest peak value and the received power with the second largest peak value from the received power of RRU1 to RRU3. If it is determined that the received power of the uplink PRACH signal received by the RRU2 has the highest peak value, it can be determined that the RRU2 is an uplink radio frequency unit to which the user terminal currently belongs, or the user terminal is located within the coverage of the RRU2. If it is determined that the peak value of the received power of RRU1 is second largest, it can be determined that the user terminal is closer to RRU1 than RRU3.

Further judgment is required as to whether the RRU1 can be used as the uplink radio frequency unit to which the user terminal currently belongs. First, it is necessary to determine the movement direction of the user terminal relative to RRU1 according to the frequency offset between RRU2 and RRU1, and then determine whether the peak power of RRU1 is greater than the received power threshold corresponding to the relative movement direction. unit. That is, it is determined that when RRU1 is the radio frequency unit to which the uplink belongs, the radio frequency unit set to which the uplink belongs includes RRU2 and RRU1; otherwise, the radio frequency unit set to which the uplink belongs includes only RRU2.

According to the frequency offset between RRU2 and RRU1, the relative motion direction of the user terminal and RRU1 can be determined by the following methods:

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 symbol of the received signal corresponding to RRU2 and RRU1 is the same, the user terminal is moving away from RRU1; otherwise, The user terminal moves in a direction close to the RRU1.

Still taking FIG. 1 as an example, through the frequency offset symbols corresponding to 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 in a direction away from RRU1. At this time, the relative relationship between the user terminal and RRU1 is obtained. The direction of movement is far away from the received power threshold corresponding to RRU1. If the received power of RRU1 exceeds the received power threshold corresponding to far away from RRU1, it is determined that RRU1 is the radio frequency unit that the user terminal currently belongs to in the uplink, that is, the radio frequency unit that the user terminal currently belongs to in the uplink includes: RRU2 and RRU1; if the received power of RRU1 is less than the received power threshold corresponding to the remote RRU1, it is determined that RRU1 is not the radio frequency unit that the user terminal currently belongs to in the uplink, that is, the radio frequency unit that the user terminal currently belongs to in the uplink only includes RRU2.

Similarly, in Figure 1, when the user terminal arrives at 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, so it can be determined that the user terminal is the radio frequency unit with the second largest quality parameter. To move towards the RRU4, at this time, the relative movement direction of the user terminal and the RRU4 is obtained to be close to the received power threshold corresponding to the RRU4. If the received power of the RRU4 exceeds the received power threshold corresponding to the close to the RRU4, it is determined that the RRU4 is the radio frequency to which the uplink of the user terminal belongs. unit, that is, the radio frequency unit to which the user terminal uplink belongs includes RRU3 and RRU4; if the received power of RRU4 is less than the corresponding receive power threshold close to RRU4, it is determined that RRU4 is not the radio frequency unit to which the user terminal uplink belongs, that is, the radio frequency to which the user terminal uplink belongs Unit includes RRU3 only.

The above application in high-speed rail scenarios can also be used in scenarios with fixed lines such as subways, trams, and trains.

The following description will be given as an example that the uplink signal is the uplink sounding reference signal SRS, and the quality parameter is the signal-to-interference-noise ratio SINR. Please refer to the schematic diagram of the macro site scenario shown in FIG. 2 . It should be noted that Figures 1 and 2 respectively use the high-speed rail application scenario and the macro station scenario as examples, which are only examples and are not limited. Applicable to the scenario shown in FIG. 2 , the following exemplary description of FIG. 2 is still applicable to FIG. 1 . The specific uplink signal is not limited, and the quality parameter of the corresponding signal is not limited, and can be selected according to the actual application.

In the scenario shown in Figure 2, 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 one RRU (the RRUs corresponding to the four small stations in Figure 3 are RRU4 to RRU3). RRU7), it is assumed that a logical cell in FIG. 2 is composed of RRU1 to RRU7.

In the process of moving from the current position to the RRU5, the user terminal determines from RRU1 to RRU7 that the RRUs that have received the uplink sounding reference signal (Sounding Reference Signal, SRS) reported by the user terminal shown in FIG. 2 include RRU1 and RRU5 , RRU2. Then, according to the Signal to Noise Ratio (SNR) corresponding to the SRS received by RRU1 , RRU5 , and RRU2 , it is determined that the radio frequency unit with the largest SINR is RRU1 , and the second largest SINR is RRU5 . Determine RRU1 as a radio frequency unit in the set of radio frequency units that the user terminal currently belongs to in the uplink, and whether RRU5 is the radio frequency unit that the user terminal currently belongs to in the uplink, it needs to be combined with the relative movement direction of the user terminal and RRU5, and the relative movement direction. The corresponding SINR threshold is determined.

Determining the relative movement direction of the user terminal and the RRU5 can be implemented in the following ways:

Determine 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 the same, the user terminal is moving in a direction away from RRU5; otherwise, the user terminal is moving in a direction close to RRU5.

If it is determined that the relative movement direction of the user terminal relative to RRU5 is close to RRU5, the SINR threshold corresponding to the direction close to RRU5 can be obtained, and then it is determined whether the SINR of RRU5 is greater than the SINR threshold corresponding to the direction close to RRU5. Another radio frequency unit in the uplink-homed radio-frequency unit set, otherwise the user terminal's uplink-homed radio-frequency unit set only includes RRU1 at this time.

In the above solution, if the movement of the user terminal relative to the ground is a low-speed movement, the frequency offset may not be considered. That is, directly comparing the received power of the radio frequency unit with the second largest quality reference signal with the received power threshold, it is determined whether the radio frequency unit with the second largest quality reference signal is the radio frequency unit to which the user terminal currently belongs in the uplink. After the set of radio frequency units is set, the radio frequency units in the radio frequency unit set can be used to combine and receive the uplink data sent by the user terminal to achieve uplink signal gain. For example, it has been determined that the radio frequency units corresponding to user terminal A include RRU1 and RRU3, and RRU1 and RRU3 can be directly used to combine and receive uplink data of user terminal A.

Further, when determining the radio frequency unit set that the user terminal currently belongs to in the uplink, in order to improve the accuracy, the radio frequency unit that is currently determined as the uplink home for many times in a row may be added to the radio frequency unit set that the user terminal currently belongs to in the uplink.

Next, the downlink determines the radio frequency unit that performs data transmission with the user terminal.

Referring to FIG. 3 , which is a flowchart of a data transmission method provided in this embodiment, the following rows of this embodiment illustrate examples. The Operation and Maintenance Center (OMC) configures the correspondence between CSI-RS resources for the RRUs in the logical cell, configures multiple sets of CSI-RS resources for the logical cell, and one RRU corresponds to one set of CSI-RS resources .

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

S320: Determine, according to the CRI, the radio frequency unit set associated with the CRI from the association relationship between the radio frequency unit included in the logical cell and the preconfigured channel state information-reference signal CSI-RS resource;

S330: Send data to the user terminal through the radio frequency unit in the radio frequency unit set associated with the CRI.

The corresponding CSI-RS resource can be determined according to the CRI fed back by the user terminal, so that the set of radio frequency units associated with the CRI can be determined according to the association relationship between the radio frequency unit and the preconfigured channel state information-reference signal CSI-RS resource . The radio frequency units in the determined radio frequency unit set associated with the CRI send downlink data to the user terminal respectively, so as to avoid the simultaneous transmission of data by all radio frequency units in the logical cell from causing interference to other users in the logical cell.

Preferably, in order to save resources, multiple RRUs may correspond to the same CSI-RS resource, and the number of CSI-RS resource sets configured depends on the number of RRUs that can cause interference between RRUs. It should be understood that in the initial stage of networking, multiple sets of periodic CSI-RS/Tracking Reference Signal (TRS) resources need to be configured, and the configuration needs to ensure that the CSI-RS/Synchronization Signal and PBCH block (SSB) There is a multiple relationship between the number and the number of combined cells (radio frequency units), and the number of CSI-RS and TRS/SSB beams is the same. Wherein, different CSI-RS resources are allocated to radio frequency units with strong mutual interference, and the same CSI-RS resources are multiplexed for radio frequency units with weak mutual interference; the interference value between the radio frequency units is greater than a preset value The interference threshold value indicates that there is strong interference, and the interference value is less than or equal to the interference threshold value to determine that the interference is weak.

In an implementation manner, in the uplink, data sent by the user terminal can be combined and received through the radio frequency unit in the determined uplink radio frequency unit set, and in the downlink, data can be sent to the user terminal through the radio frequency unit in the radio frequency unit set associated with the CRI. . Further, if the radio frequency unit set associated with the CRI and the uplink-homed radio frequency unit set have an intersection (ie, the first intersection), the intersection of the radio frequency unit set associated with the CRI and the uplink-homed radio frequency unit set may be used. The radio frequency unit in (the first intersection) performs uplink and downlink data transmission with the user terminal.

In order to further understand the selection of the downlink radio frequency unit, an example is described below. Please refer to FIG. 4 and FIG. 5 , FIG. 4 is a schematic diagram 1 of a CSI-RS resource configuration provided by an embodiment of the present invention, and FIG. 5 is a schematic diagram 2 of a CSI-RS resource configuration provided by an embodiment of the present invention.

It is assumed that RRU1 to RRU6 in FIG. 4 and FIG. 5 belong to the same logical cell. There is interference between two adjacent RRUs in Figure 4, such as interference between RRU1 and RRU2, and interference between RRU2 and RRU3. 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 resources, two adjacent RRUs in the logical cell shown in Figure 4 are configured with different CSI-RS resources, and one RRU is configured with the same CSI-RS resources. The total number of RS resources is 2 (ie CSI-RS1, CSI-RS2).

In Figure 5, there is interference between RRU1 to RRU3, and the interference between RRU1 and RRU4 is negligible. That is to say, there is interference between the three consecutive RRUs in Figure 5. Therefore, each three consecutive RRUs can be configured with different CSI-RS resources (the CSI-RS resources configured in sequence from RRU1 to RRU3 in the figure are CSI-RS1 to CSI-RS3), and RRU4 to RRU6 multiplex the CSI-RS resources of RRU1 to RRU3 in sequence. Therefore, in the logical cell shown in FIG. 5 , The total number of included CSI-RS resources is 3 (ie, CSI-RS1 to CSI-RS3).

It should be noted that both Figures 4 and 5 take RRUs set along the high-speed rail line as an example, and the number of RRUs and the direction of the transmitting beam (the oval in the figure represents the beam) is assumed to correspond to the number and direction shown in the figure.

For another example, please continue to refer to FIG. 2. In a common network, RRU1\RRU2\RRU3, SmallRRU4\SmallRRU5\SmallRRU6\SmallRRU7 (SmallRRU refers to small RRU) respectively correspond to one physical cell, with a total of 7 cells. Each RRU in FIG. 2 corresponds to a physical cell, and the physical cells corresponding to RRU1 to RRU7 in FIG. 2 can be formed into a logical cell by using the solution of the present invention. Suppose there are N _CSIRS CSI-RS resources, and N _CSIRS is greater than K. If N _CSIRS > 1, the first K CSI-RS resources each correspond to an 8-antenna RRU, and the last one or several CSI-RS resources correspond to all DAS/PICO /Small stations such as pole stations (distributed antenna systems/pico base stations) (corresponding to RRU4 to RRU7, namely SmallRRU4\SmallRRU5\SmallRRU6\SmallRRU7). For example, for 4 sets of CSI-RS resources, RRU1\RRU2\RRU3 use different CSI-RS resources (CSI-RS resource 1, CSI-RS resource 2, CSI-RS resource 3) respectively, and RRU4~RRU7 can reuse one set CSI-RS resource (CSI-RS resource 4). Small RRUs are distributed at the edge of macro cells or areas with poor coverage to supplement 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 shown in Figure 2, the above example is only a coverage configuration. The configurator can set the number of multiplexed CSI-RS resources according to the number of RRUs that can interfere with each other due to the RRU spacing. Different CSI-RS/TRS resources need to be allocated between RRUs, and the same CSI-RS resources can be multiplexed between RRUs with weak interference.

On the basis of the method embodiment shown in FIG. 3 , the isolation degree can be further considered to improve the utilization rate of air interface resources in the cell.

Specifically: S410: In the logical cell, determine a target radio frequency unit set that satisfies 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 greater than the second threshold.

For example, the uplink signal includes a PRACH (Physical Random Access Channel, physical random access channel) signal or an uplink sounding reference signal SRS, etc., which is not specifically limited here. Preferably, the user terminal uses the PRACH signal during initial access, and can use the uplink sounding reference signal SRS after access.

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 unit for which the received power RSRP of the uplink sounding reference signal SRS is greater than the first threshold, and the corresponding SINR is greater than the second threshold. That is, the target radio frequency unit set of the user terminal (current user terminal) is determined, and the main function of determining the target radio frequency unit set is to judge the isolation degree of different user terminals. Step S410 is a way of determining the target radio frequency unit set of the current user terminal. In the logical cell, there are multiple user terminals. For each other user terminal (user terminal other than the current user terminal), the base station can report through each user terminal. The received power and SINR of the SRS signal determine the target radio frequency unit set corresponding to each user terminal. 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 requirements, and space division multiplexing can be used between different user terminals to use cell resources; conversely, different user terminals can use cell resources. The frequency division multiplexing method shares cell resources.

It can be understood that, when determining the uplink-homed radio frequency unit set of the user terminal, the target radio frequency unit set can be determined at the same time, and the uplink-homed radio frequency unit set and the target radio frequency unit set may be the same (for example, the quality parameter used for the determination threshold is different. at the same time).

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

After determining the target radio frequency unit set of the user terminal (current user terminal), take the radio frequency unit in the intersection (second intersection) of the radio frequency unit set associated with the CRI determined in the downlink and the target radio frequency unit set (second intersection) to perform the communication with the user terminal. Upstream data transmission. Alternatively, the radio frequency unit and the user terminal in the first intersection and the second intersection are used to perform uplink and downlink data transmission, and the radio frequency unit and the user terminal in the first intersection and the second intersection are taken to perform uplink and downlink data transmission, that is, the target radio frequency unit set is taken. , the radio frequency unit in the intersection of the radio frequency unit set to which the user terminal belongs in the uplink and the radio frequency unit set determined in the downlink.

Taking three users as an example, user terminal A, user terminal B, and user terminal C all access this logical cell for services. The base station measures the RSRP and SINR of the SRS reported by the three users on each RRU. When the RSRP is greater than the threshold th_rsrp (the first threshold) and the SINR is greater than the threshold th_sinr (the second threshold), the RRU is determined as one of the target radio frequency unit sets. ), then it is considered that the three users meet the isolation requirements, and the three users can use all the PRB resources of the cell in the way of simultaneous space division multiplexing. The intersection of the two processes the uplink and downlink data of the user terminal. When there is an intersection between the RRUs selected by the three user terminals for uplink and downlink and the RRUs calculated by the isolation degree, the user terminals belonging to the RRUs related to the intersection need to share the PRB resources of the cell bandwidth through frequency division.

Taking the scenario shown in Figure 2 as an example, it is still applicable to the high-speed rail scenario. Downlink channel selection (determining the RRU to which the downlink belongs), and the CSI-RS selected by user terminal A, user terminal B, and user terminal C reported by CRI is resource1- One of 4, determine the RRU to which the user terminal belongs in the downlink according to the relationship between the RRU and the CSI-RS, and compare the RSRP and SINR of the three user terminal SRSs measured by each RRU of the base station with the threshold th_rsrp and the threshold th_sinr, and calculate the user The target radio frequency unit sets to which terminal A, user terminal B, and user terminal C belong respectively. When it is judged according to the user isolation degree that the target radio frequency unit sets to which the three user terminals belong have no intersection, the three user terminals can be simultaneously separated by space division. All RPB resources under the cell bandwidth are used, and the intersection of the RRU selected in the downlink (or uplink and downlink) and the RRU corresponding to the target radio frequency unit set of the user terminal is used to process the uplink and downlink air interface data of the user. If user terminal A and user terminal B determine the RRU (target radio frequency unit set) to which they belong according to the user isolation degree, there is an intersection, and user terminal C has no intersection with the RRUs to which user terminal A and user terminal B belong, then user terminal A and user terminal B need to The PRB resources of the cell are used in frequency division multiplexing, and all the PRB resources of the cell are used by the user terminal C, the user terminal A and the user terminal B in the manner of space division multiplexing. And so on. In this way, on the basis of not increasing the hardware cost, the utilization efficiency of the air interface resources of the cell is greatly improved by means of software, and the user's perception experience is improved.

In addition, since high-speed rail networks are all linear networks, configuration rules can also be set according to this feature during networking, and different CSI-RS resources can be allocated to radio frequency units with strong mutual interference. The weaker radio frequency unit multiplexes the same CSI-RS resource (the interference value between the radio frequency units is greater than the preset interference threshold value, the interference is stronger, and the interference value is less than or equal to the described interference threshold value to determine that the interference is weaker. The base station can be based on the configuration rule. Directly judge whether different user terminals meet the isolation requirements (that is, whether the interference is weak). As shown in Figure 5, the isolation requirements are met between RRU1 and RRU4 to RRU6 (that is, the interference between them is weak and can be ignored). The user terminal can spatially multiplex all PRB resources under the cell bandwidth with the user terminals in RRU4 to RRU6, and the base station can transmit the uplink and downlink data of the user terminal according to the RRU to which the user terminal belongs.

Referring to FIG. 6, it is a schematic diagram of downlink data transmission of different user terminals in a high-speed rail scenario provided by an embodiment of the present invention. For a high-speed rail application scenario, judgment can be simplified.

When user terminal A and user terminal B report that the CSI-RS corresponding to CRI is CSI-RS1, according to the association relationship of CSI-RS provided by OMC, it can be known that CSI-RS1 corresponds to RRU1 and RRU4 (they constitute the RRU set corresponding to user terminal A). User terminal A is far away from RRU4, so user terminal A selects RRU1 for the downlink channel (that is, it can be determined that RRU1 is the radio frequency unit to which user terminal A belongs in downlink). If the home radio frequency unit determined by the user terminal A in the uplink is also the RRU1, the RRU1 is selected to send the downlink data of the user terminal A (or the RRU1 is selected to transmit the uplink and downlink data with the user terminal).

Similarly, user terminal B selects RRU4 for downlink transmission, user terminal C reports the corresponding CSI-RS of CRI as CSI-RS3, and selects RRU3 for downlink transmission. 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 away, there is no interference to user terminal A and user terminal B when they are sent together. At this time, user terminal A and user terminal B can simultaneously use all PRB resources under the cell bandwidth through space division. 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 The PRB resources of the cell bandwidth are shared by frequency division.

In the above manner, the utilization efficiency of cell resources can be greatly improved, and the user experience can be improved without increasing the hardware cost.

As shown in FIG. 7, a base station provided by an embodiment of the present invention includes a memory 701, a transceiver 702, and a processor 703:

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

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

According to the CRI, the radio frequency unit set associated with the CRI is determined from the association relationship between the radio frequency unit included in the logical cell and the preconfigured channel state information-reference signal CSI-RS resource; wherein the radio frequency unit includes a radio frequency puller The remote unit RRU or the 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; the radio frequency unit in the radio frequency unit set associated with the CRI is sent to the user terminal. data.

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

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

From the radio frequency units that receive the uplink signal sent by the user terminal, determine the radio frequency unit set that the user terminal currently belongs to in the uplink; and receive the data sent by the user terminal by combining the radio frequency units in the radio frequency unit set to which the uplink belongs.

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

Determine whether 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, and if so, perform uplink and downlink data transmission with the user terminal through the radio frequency units in the first intersection set.

In a possible implementation manner, when determining, from the radio frequency unit that receives the uplink signal sent by the user terminal, the radio frequency unit set to which the user terminal currently belongs in the uplink, the processor 703 is specifically configured to:

From the radio frequency unit that receives the uplink signal sent by the user terminal,

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;

Determine the radio frequency unit with the largest quality parameter of the received uplink signal as an uplink home radio frequency unit;

According to the frequency offset between the radio frequency unit with the highest 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 user terminal and the radio frequency with the second largest quality parameter of the received uplink signal The relative movement direction of the unit;

When the quality parameter of the radio frequency unit with the second largest received uplink signal quality parameter is greater than the quality parameter threshold corresponding to the relative motion direction, the radio frequency unit with the next largest received uplink signal quality parameter is determined as another uplink home radio frequency unit.

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:

If the radio frequency unit with the highest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal receive the same frequency offset symbol for the uplink signal, then:

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

If not, the user terminal moves in a direction close to the radio frequency unit with the second largest quality parameter of the received uplink signal.

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

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

Perform uplink and downlink data transmission with the user terminal through the radio frequency unit in the second intersection set 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 set corresponding to other user terminals, the user terminal and other user terminals share cell resources through frequency division multiplexing; All PRB resources in the cell are used between the user terminal and other user terminals through space division multiplexing.

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

Wherein, in FIG. 7 , the bus architecture may include any number of interconnected buses and bridges, specifically, one or more processors represented by processor 703 and various circuits of memory represented by memory 701 are linked together. The bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described further herein. The bus interface provides the interface. Transceiver 702 may be multiple elements, including a transmitter and a receiver, providing means for communicating with various other devices over transmission media including wireless channels, wired channels, fiber optic cables, and the like. 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 in performing operations.

The processor 703 may be a central processor (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or a complex programmable logic device (Complex Programmable Logic Device, CPLD), the processor can also use a multi-core architecture.

It should be noted here that the above-mentioned base station provided by the embodiment of the present invention can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same as the method embodiment in this embodiment is not repeated here. The parts and beneficial effects will be described in detail.

Based on the same inventive concept, an embodiment of the present invention provides a base station. For the specific implementation of the data transmission method of the base station, reference may be made to the description of the method embodiment section. :

a first determining unit 801, configured to determine the channel state information reference signal resource indicator CRI fed back by the user terminal;

The second determining unit 802 is configured to determine, according to the CRI, the radio frequency unit set associated with the CRI from the association relationship between the radio frequency unit included in the logical cell and the preconfigured channel state information-reference signal CSI-RS resource; wherein , the radio frequency unit includes a remote radio 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;

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

A possible implementation manner, the preconfigured channel state information-reference signal CSI-RS resource association relationship includes: radio frequency units with strong mutual interference correspond to different CSI-RS resources, and radio frequency units with weak mutual interference correspond to different CSI-RS resources. The units reuse the same CSI-RS resources; the interference value between the radio frequency units is greater than a preset interference threshold value, and it is determined that the interference is strong, and the interference value is less than or equal to the interference threshold value, and the interference is determined to be weak.

In a possible implementation manner, the base station further includes a third determining unit, configured to: determine, from the radio frequency units that receive the uplink signal sent by the user terminal, the radio frequency unit set that the user terminal currently belongs to in the uplink;

The transmitting unit 803 is specifically 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.

In a possible implementation manner, the transmission unit 803 is further configured to determine whether 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 user terminal performs uplink and downlink data transmission.

In a possible implementation manner, the third determining unit is configured to, from the radio frequency unit that receives the uplink signal sent by the user terminal, determine the set of radio frequency units that the user terminal currently belongs to in the uplink, including:

Determine, 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;

Determine the radio frequency unit with the largest quality parameter of the received uplink signal as an uplink home radio frequency unit;

According to the frequency offset between the radio frequency unit with the highest 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 user terminal and the radio frequency with the second largest quality parameter of the received uplink signal The relative movement direction of the unit;

When the quality parameter of the radio frequency unit with the second largest received uplink signal quality parameter is greater than the quality parameter threshold corresponding to the relative motion direction, the radio frequency unit with the next largest received uplink signal quality parameter is determined as another uplink home radio frequency unit.

In a possible implementation manner, the third determining unit is further configured to 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, including:

If the radio frequency unit with the highest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal receive the same frequency offset symbol for the uplink signal, then:

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

If not, the user terminal moves in a direction close to the radio frequency unit with the second largest quality parameter of the received uplink signal.

In 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 satisfies a preset condition, where the preset condition includes receiving the uplink data sent by the user terminal. The received power of the signal is greater than the first threshold, and the corresponding SINR is greater than the second threshold;

The transmission unit 803 is configured to perform uplink and downlink data transmission with the user terminal through the radio frequency unit 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 set corresponding to other user terminals, the user terminal and other user terminals share cell resources through frequency division multiplexing; Cell resources are shared between the user terminal and other user terminals through space division multiplexing.

In 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 unit in the intersection of the radio frequency unit set to which the user terminal currently belongs and the second intersection set.

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

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a processor-readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes .

It should be noted here that the above-mentioned base station provided by the embodiment of the present invention can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same as the method embodiment in this embodiment is not repeated here. The parts and beneficial effects will be described in detail.

Based on the same inventive concept, 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 above-mentioned data transfer method.

The processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic storage (eg, floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (eg, CD, DVD, BD, HVD, etc.), and semiconductor memory (eg, ROM, EPROM, EEPROM, non-volatile memory (NANDFLASH), solid-state disk (SSD)), and the like.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied therein, including but not limited to disk storage, optical storage, and the like.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowcharts and/or block diagrams, and combinations of flows and/or blocks in the flowcharts and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These processor-executable instructions may also be stored in a processor-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the processor-readable memory result in the manufacture of means including the instructions product, the instruction means implements the functions specified in the flow or flow of the flowchart and/or the block or blocks of the block diagram.

These processor-executable instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process that Execution of the instructions provides steps for implementing the functions specified in the flowchart or blocks and/or the block or blocks of the block diagrams.

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 equivalents, the present application is also intended to include these modifications and variations.

Claims (14)

1. A method for data transmission, applied to a base station, wherein the method comprises: Determine the channel state information reference signal resource indicator CRI fed back by the user terminal; According to the CRI, the radio frequency unit set associated with the CRI is determined from the association relationship between the radio frequency unit included in the logical cell and the preconfigured channel state information-reference signal CSI-RS resource; wherein the radio frequency unit includes a radio frequency puller A 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; The data is sent to the user terminal through the radio frequency unit in the radio frequency unit set associated with the CRI. 2. The method according to claim 1, wherein the preconfigured association relationship between channel state information and reference signal CSI-RS resources comprises: The radio frequency units with strong mutual interference correspond to different CSI-RS resources, and the radio frequency units with weak mutual interference reuse the same CSI-RS resources; the interference value between the radio frequency units is greater than the preset interference threshold value, It is determined that the interference is strong, and the interference value is less than or equal to the interference threshold to determine that the interference is weak. 3. The method of claim 1, further comprising: 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 data sent by the user terminal is received by combining the radio frequency units in the uplink home radio frequency unit set. 4. method according to claim 3, is characterized in that, also comprises: 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, perform uplink and downlink data transmission with the user terminal through the radio frequency unit in the first intersection set. 5. The method according to claim 3, wherein, from the radio frequency unit that receives the uplink signal sent by the user terminal, determining the radio frequency unit set to which the user terminal currently belongs in the uplink comprises: Determine, 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; Determine the radio frequency unit with the largest quality parameter of the received uplink signal as an uplink home radio frequency unit; According to the frequency offset between the radio frequency unit with the highest 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 user terminal and the radio frequency with the second largest quality parameter of the received uplink signal The relative movement direction of the unit; When the quality parameter of the radio frequency unit with the second largest received uplink signal quality parameter is greater than the quality parameter threshold corresponding to the relative motion direction, the radio frequency unit with the next largest received uplink signal quality parameter is determined as another uplink home radio frequency unit. 6. The method according to claim 5, wherein 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 comprises: If the radio frequency unit with the highest quality parameter of the received uplink signal and the radio frequency unit with the second largest quality parameter of the received uplink signal receive the same frequency offset symbol of the uplink signal, the user terminal is to receive the uplink signal far away. The direction movement of the radio frequency unit with the second largest quality parameter of the uplink signal; If not, the user terminal moves in a direction close to the radio frequency unit with the second largest quality parameter of the received uplink signal. 7. The method of claim 3, further comprising: In the logical cell, determine a target radio frequency unit set that satisfies 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 unit in the second intersection set 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 set corresponding to other user terminals, the user terminal and other user terminals share cell resources through frequency division multiplexing; Cell resources are used between the user terminal and other user terminals through space division multiplexing. 8 . The method according to claim 7 , further comprising: performing uplink and downlink data transmission with the user terminal through the radio frequency unit in the intersection of the radio frequency unit set to which the user terminal currently belongs and the second intersection set and the second intersection set. 9 . . 9. A base station, comprising a memory, a transceiver, and a processor: a memory for storing a computer program; a transceiver for sending and receiving data under the control of the processor; a processor for reading the computer program in the memory and executing the following steps; Determine the channel state information reference signal resource indicator CRI fed back by the user terminal; According to the CRI, the radio frequency unit set associated with the CRI is determined from the association relationship between the radio frequency unit included in the logical cell and the preconfigured channel state information-reference signal CSI-RS resource; wherein the radio frequency unit includes a radio frequency puller A 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; The data is sent to the user terminal through the radio frequency unit in the radio frequency unit set associated with the CRI. 10. The base station according to claim 9, wherein the processor is further 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 data sent by the user terminal is received through the radio frequency unit in the uplink home radio frequency unit set. 11. The base station according to claim 10, wherein the processor is further configured to: 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, perform uplink and downlink data transmission with the user terminal through the radio frequency unit in the first intersection set. 12. The base station according to claim 11, wherein the processor is further configured to: In the logical cell, determine a target radio frequency unit set that satisfies 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 unit in the second intersection set 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 set corresponding to other user terminals, the user terminal and other user terminals share cell resources through frequency division multiplexing; Cell resources are used between the user terminal and other user terminals through space division multiplexing. 13. A base station, comprising: a first determining unit, configured to determine the channel state information reference signal resource indicator CRI fed back by the user terminal; The second determining unit is configured to determine, according to the CRI, the radio frequency unit set associated with the CRI from the association relationship between the radio frequency unit included in the logical cell and the preconfigured channel state information-reference signal CSI-RS resource; wherein, The radio frequency unit includes a remote radio 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; A transmission unit, configured to send data to the user terminal through a radio frequency unit in a set of radio frequency units associated with the CRI. 14. A processor-readable storage medium, wherein the processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the processor according to any one of claims 1 to 8. Methods.

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